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Chubanov V, Köttgen M, Touyz RM, Gudermann T. TRPM channels in health and disease. Nat Rev Nephrol 2024; 20:175-187. [PMID: 37853091 DOI: 10.1038/s41581-023-00777-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2023] [Indexed: 10/20/2023]
Abstract
Different cell channels and transporters tightly regulate cytoplasmic levels and the intraorganelle distribution of cations. Perturbations in these processes lead to human diseases that are frequently associated with kidney impairment. The family of melastatin-related transient receptor potential (TRPM) channels, which has eight members in mammals (TRPM1-TRPM8), includes ion channels that are highly permeable to divalent cations, such as Ca2+, Mg2+ and Zn2+ (TRPM1, TRPM3, TRPM6 and TRPM7), non-selective cation channels (TRPM2 and TRPM8) and monovalent cation-selective channels (TRPM4 and TRPM5). Three family members contain an enzymatic protein moiety: TRPM6 and TRPM7 are fused to α-kinase domains, whereas TRPM2 is linked to an ADP-ribose-binding NUDT9 homology domain. TRPM channels also function as crucial cellular sensors involved in many physiological processes, including mineral homeostasis, blood pressure, cardiac rhythm and immunity, as well as photoreception, taste reception and thermoreception. TRPM channels are abundantly expressed in the kidney. Mutations in TRPM genes cause several inherited human diseases, and preclinical studies in animal models of human disease have highlighted TRPM channels as promising new therapeutic targets. Here, we provide an overview of this rapidly evolving research area and delineate the emerging role of TRPM channels in kidney pathophysiology.
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Affiliation(s)
- Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
| | - Michael Köttgen
- Renal Division, Department of Medicine, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- CIBSS - Centre for Integrative Biological Signalling Studies, Freiburg, Germany
| | - Rhian M Touyz
- Research Institute of McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
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Zeitlmayr S, Cami D, Selmani B, Gudermann T, Breit A. A dual role for ERK-1/2 in the regulation of plasmin activity and cell migration in metastatic NSCLC-H1299 cells. Arch Toxicol 2023; 97:3113-3128. [PMID: 37712947 PMCID: PMC10567951 DOI: 10.1007/s00204-023-03600-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 08/30/2023] [Indexed: 09/16/2023]
Abstract
Occupational and environmental exposure of various toxins or cigarette smoke causes non-small cell lung carcinoma (NSCLC); a devastating disease with a very low survival rate after metastasis. Increased activity of plasmin is a hallmark in NSCLC metastasis. It is accepted that metastatic cells exhibit higher plasmin activity than cells from primary tumors. Mechanisms behind this elevation, however, are barely understood. We compared plasmin activity and cell migration of A549 cells derived from a primary lung tumor with metastatic H1299 lung cells isolated from lymph nodes. Surprisingly, we found higher plasmin activity and migration for A549 cells. mRNA levels of the plasminogen activator inhibitor-1 (PAI-1) were higher in H1299 cells and activity of extracellular-regulated kinases-1/2 (ERK-1/2) was increased. An inhibitor of ERK-1/2 decreased PAI-1 mRNA levels and increased plasmin activity or cell migration in H1299 cells. Transforming growth factor-β (TGF-β) decreased plasmin activity and migration in A549 cells but enhanced both in H1299 cells. The cytokine massively increased PAI-1 and decreased urokinase plasminogen activator (uPA) levels in A549 cells but strongly induced uPA and only weakly PAI- 1 expression in H1299 cells. Consequently, TGF-β enhanced plasmin activity and cell migration in H1299. Additionally, TGF-β activated ERK-1/2 stronger in H1299 than in A549 cells. Accordingly, an ERK-1/2 inhibitor completely reversed the effects of TGF-β on uPA expression, plasmin activity and migration in H1299 cells. Hence, we provide first data indicating TGF-β-promoted increased plasmin activity and suggest that blocking TGF-β-promoted ERK-1/2 activity might be a straightforward approach to inhibit NSCLC metastasis.
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Affiliation(s)
- Sarah Zeitlmayr
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Ditila Cami
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Belinda Selmani
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany.
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Hoeger B, Nadolni W, Hampe S, Hoelting K, Fraticelli M, Zaborsky N, Madlmayr A, Sperrer V, Fraticelli L, Addington L, Steinritz D, Chubanov V, Geisberger R, Greil R, Breit A, Boekhoff I, Gudermann T, Zierler S. Inactivation of TRPM7 Kinase Targets AKT Signaling and Cyclooxygenase-2 Expression in Human CML Cells. Function (Oxf) 2023; 4:zqad053. [PMID: 37786778 PMCID: PMC10541797 DOI: 10.1093/function/zqad053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 09/01/2023] [Accepted: 09/11/2023] [Indexed: 10/04/2023] Open
Abstract
Cyclooxygenase-2 (COX-2) is a key regulator of inflammation. High constitutive COX-2 expression enhances survival and proliferation of cancer cells, and adversely impacts antitumor immunity. The expression of COX-2 is modulated by various signaling pathways. Recently, we identified the melastatin-like transient-receptor-potential-7 (TRPM7) channel-kinase as modulator of immune homeostasis. TRPM7 protein is essential for leukocyte proliferation and differentiation, and upregulated in several cancers. It comprises of a cation channel and an atypical α-kinase, linked to inflammatory cell signals and associated with hallmarks of tumor progression. A role in leukemia has not been established, and signaling pathways are yet to be deciphered. We show that inhibiting TRPM7 channel-kinase in chronic myeloid leukemia (CML) cells results in reduced constitutive COX-2 expression. By utilizing a CML-derived cell line, HAP1, harboring CRISPR/Cas9-mediated TRPM7 knockout, or a point mutation inactivating TRPM7 kinase, we could link this to reduced activation of AKT serine/threonine kinase and mothers against decapentaplegic homolog 2 (SMAD2). We identified AKT as a direct in vitro substrate of TRPM7 kinase. Pharmacologic blockade of TRPM7 in wildtype HAP1 cells confirmed the effect on COX-2 via altered AKT signaling. Addition of an AKT activator on TRPM7 kinase-dead cells reconstituted the wildtype phenotype. Inhibition of TRPM7 resulted in reduced phosphorylation of AKT and diminished COX-2 expression in peripheral blood mononuclear cells derived from CML patients, and reduced proliferation in patient-derived CD34+ cells. These results highlight a role of TRPM7 kinase in AKT-driven COX-2 expression and suggest a beneficial potential of TRPM7 blockade in COX-2-related inflammation and malignancy.
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Affiliation(s)
- Birgit Hoeger
- Institute of Pharmacology, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz and Krankenhausstr. 5, 4020 Linz, Austria
| | - Wiebke Nadolni
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Sarah Hampe
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Kilian Hoelting
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Marco Fraticelli
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Nadja Zaborsky
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectiology and Rheumatology, Oncologic Center, Paracelsus Medical University, 5020 Salzburg, Austria
- Salzburg Cancer Research Institute–Laboratory for Immunological and Molecular Cancer Research (SCRI–LIMCR), Müllner Hauptstr. 48, 5020 Salzburg, Austria
- Cancer Cluster Salzburg, 5020 Salzburg, Austria
| | - Anna Madlmayr
- Institute of Pharmacology, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz and Krankenhausstr. 5, 4020 Linz, Austria
| | - Viktoria Sperrer
- Institute of Pharmacology, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz and Krankenhausstr. 5, 4020 Linz, Austria
| | - Laura Fraticelli
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Lynda Addington
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Dirk Steinritz
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Vladimir Chubanov
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Roland Geisberger
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectiology and Rheumatology, Oncologic Center, Paracelsus Medical University, 5020 Salzburg, Austria
- Salzburg Cancer Research Institute–Laboratory for Immunological and Molecular Cancer Research (SCRI–LIMCR), Müllner Hauptstr. 48, 5020 Salzburg, Austria
- Cancer Cluster Salzburg, 5020 Salzburg, Austria
| | - Richard Greil
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectiology and Rheumatology, Oncologic Center, Paracelsus Medical University, 5020 Salzburg, Austria
- Salzburg Cancer Research Institute–Laboratory for Immunological and Molecular Cancer Research (SCRI–LIMCR), Müllner Hauptstr. 48, 5020 Salzburg, Austria
- Cancer Cluster Salzburg, 5020 Salzburg, Austria
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Ingrid Boekhoff
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
| | - Susanna Zierler
- Institute of Pharmacology, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz and Krankenhausstr. 5, 4020 Linz, Austria
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Goethestr. 33, 80336 Munich, Germany
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Khajavi N, Riçku K, Schreier PCF, Gentz T, Beyerle P, Cruz E, Breit A, Reinach PS, Gudermann T. Chronic Mg 2+ Deficiency Does Not Impair Insulin Secretion in Mice. Cells 2023; 12:1790. [PMID: 37443824 PMCID: PMC10340716 DOI: 10.3390/cells12131790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/28/2023] [Accepted: 07/03/2023] [Indexed: 07/15/2023] Open
Abstract
Magnesium is an essential mediator of a vast number of critical enzymatic cellular reactions in the human body. Some clinical epidemiological studies suggest that hypomagnesemia accounts for declines in insulin secretion in patients with type 2 diabetes (T2D); however, the results of various experimental studies do not support this notion. To address this discrepancy, we assessed the short- and long-term effects of hypomagnesemia on β-cell function and insulin secretion in primary mouse islets of Langerhans and in a mouse model of hypomagnesemia known as Trpm6Δ17 /fl;Villin1-Cre mice. We found that lowering the extracellular Mg2+ concentration from 1.2 mM to either 0.6 or 0.1 mM remarkably increased glucose-induced insulin secretion (GIIS) in primary islets isolated from C57BL/6 mice. Similarly, both the plasma insulin levels and GIIS rose in isolated islets of Trpm6Δ17 /fl;Villin1-Cre mice. We attribute these rises to augmented increases in intracellular Ca2+ oscillations in pancreatic β-cells. However, the glycemic metabolic profile was not impaired in Trpm6Δ17 /fl;Villin1-Cre mice, suggesting that chronic hypomagnesemia does not lead to insulin resistance. Collectively, the results of this study suggest that neither acute nor chronic Mg2+ deficiency suppresses glucose-induced rises in insulin secretion. Even though hypomagnesemia can be symptomatic of T2D, such deficiency may not account for declines in insulin release in this disease.
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Affiliation(s)
- Noushafarin Khajavi
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Klea Riçku
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Pascale C. F. Schreier
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Tanja Gentz
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Philipp Beyerle
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Emmanuel Cruz
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
| | - Peter S. Reinach
- Ophthalmology Department, Wenzhou Medical University, Wenzhou 325015, China;
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, 80539 Munich, Germany; (K.R.); (P.C.F.S.); (T.G.); (P.B.); (E.C.); (A.B.)
- German Center for Lung Research, 81377 Munich, Germany
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Yang L, Steiger S, Shi C, Gudermann T, Mammadova-Bach E, Braun A, Anders HJ. Both hyperglycemia and hyperuricemia aggravate acute kidney injury during cholesterol embolism syndrome despite opposite effects on kidney infarct size. Kidney Int 2023; 104:139-150. [PMID: 37001603 DOI: 10.1016/j.kint.2023.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 02/08/2023] [Accepted: 03/09/2023] [Indexed: 03/31/2023]
Abstract
Kidney cholesterol crystal embolism (CCE) occurs in advanced atherosclerosis and induces a thrombotic (micro)angiopathy, a drop in the glomerular filtration rate (GFR), and an ischemic kidney infarction with necroinflammation. We speculated that common metabolic comorbidities such as diabetes or hyperuricemia would independently modulate each of these distinct pathophysiological processes. To test this, experimental CCE was induced by injecting cholesterol crystals into the left kidney artery of mice and thrombotic angiopathy, GFR drop, and infarct size were analyzed after 24 hours in the presence of hyperglycemia (about 500 mg/dL) or hyperuricemia (about 8 mg/dL) or their absence. In healthy mice, unilateral CCE caused diffuse thrombotic angiopathy in interlobar, arcuate and interlobular arteries, followed by a 50% or less drop in GFR compared to baseline and a variable degree of ischemic kidney necrosis. Hyperglycemia but not hyperuricemia aggravated thrombotic angiopathy although both caused a GFR decline, albeit via different mechanisms. Hyperglycemia aggravated GFR loss by increasing necroinflammation and infarct size, while the antioxidative effects of hyperuricemia reasonably attenuated necroinflammation and infarct size but induced a diffuse vasoconstriction in affected and unaffected kidney tissue. Thus, both hyperglycemia or hyperuricemia aggravate CCE-induced acute kidney failure despite having opposite effects on ischemic necroinflammation and infarction.
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Affiliation(s)
- Luying Yang
- Department of Medicine IV, Hospital of Ludwig-Maximilian-University, Munich, Germany
| | - Stefanie Steiger
- Department of Medicine IV, Hospital of Ludwig-Maximilian-University, Munich, Germany
| | - Chongxu Shi
- Department of Medicine IV, Hospital of Ludwig-Maximilian-University, Munich, Germany; School of Life Sciences, Nantong Laboratory of Development and Diseases, Medical College, Nantong University, Nantong, China
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University, Munich, Germany
| | - Elmina Mammadova-Bach
- Department of Medicine IV, Hospital of Ludwig-Maximilian-University, Munich, Germany; Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University, Munich, Germany
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University, Munich, Germany
| | - Hans-Joachim Anders
- Department of Medicine IV, Hospital of Ludwig-Maximilian-University, Munich, Germany.
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Gotru SK, Mammadova-Bach E, Sogkas G, Schuhmann MK, Schmitt K, Kraft P, Herterich S, Mamtimin M, Pinarci A, Beck S, Stritt S, Chao H, Ren P, Freund JN, Klemann C, Ringshausen FC, Heemskerk JWM, Dietrich A, Nieswandt B, Stoll G, Gudermann T, Braun A. MAGT1 Deficiency Dysregulates Platelet Cation Homeostasis and Accelerates Arterial Thrombosis and Ischemic Stroke in Mice. Arterioscler Thromb Vasc Biol 2023. [PMID: 37381987 DOI: 10.1161/atvbaha.122.318115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
BACKGROUND MAGT1 (magnesium transporter 1) is a subunit of the oligosaccharide protein complex with thiol-disulfide oxidoreductase activity, supporting the process of N-glycosylation. MAGT1 deficiency was detected in human patients with X-linked immunodeficiency with magnesium defect syndrome and congenital disorders of glycosylation, resulting in decreased cation responses in lymphocytes, thereby inhibiting the immune response against viral infections. Curative hematopoietic stem cell transplantation of patients with X-linked immunodeficiency with magnesium defect causes fatal bleeding and thrombotic complications. METHODS We studied the role of MAGT1 deficiency in platelet function in relation to arterial thrombosis and hemostasis using several in vitro experimental settings and in vivo models of arterial thrombosis and transient middle cerebral artery occlusion model of ischemic stroke. RESULTS MAGT1-deficient mice (Magt1-/y) displayed accelerated occlusive arterial thrombus formation in vivo, a shortened bleeding time, and profound brain damage upon focal cerebral ischemia. These defects resulted in increased calcium influx and enhanced second wave mediator release, which further reinforced platelet reactivity and aggregation responses. Supplementation of MgCl2 or pharmacological blockade of TRPC6 (transient receptor potential cation channel, subfamily C, member 6) channels, but not inhibition of store-operated calcium entry, normalized the aggregation responses of Magt1-/y platelets to the control level. GP (glycoprotein) VI activation of Magt1-/y platelets resulted in hyperphosphorylation of Syk (spleen tyrosine kinase), LAT (linker for activation of T cells), and PLC (phospholipase C) γ2, whereas the inhibitory loop regulated by PKC (protein kinase C) was impaired. A hyperaggregation response to the GP VI agonist was confirmed in human platelets isolated from a MAGT1-deficient (X-linked immunodeficiency with magnesium defect) patient. Haploinsufficiency of TRPC6 in Magt1-/y mice could normalize GP VI signaling, platelet aggregation, and thrombus formation in vivo. CONCLUSIONS These results suggest that MAGT1 and TRPC6 are functionally linked. Therefore, deficiency or impaired functionality of MAGT1 could be a potential risk factor for arterial thrombosis and stroke.
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Affiliation(s)
- Sanjeev Kiran Gotru
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
| | - Elmina Mammadova-Bach
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
- Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians University Hospital, Munich, Germany (E.M.-B., M.M., H.C.)
| | - Georgios Sogkas
- Cluster of Excellence RESIST, Hannover Medical School (MHH), Germany. (G. Sogkas)
- Rheumatology and Immunology, Hannover Medical School (MHH), Germany. (G. Sogkas)
| | - Michael K Schuhmann
- Department of Neurology, University Hospital of Würzburg, Germany (M.K.S., P.K., G. Stoll)
| | - Karen Schmitt
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
| | - Peter Kraft
- Department of Neurology, University Hospital of Würzburg, Germany (M.K.S., P.K., G. Stoll)
- Department of Neurology, Hospital Main-Spessart, Lohr, Germany (P.K.)
| | - Sabine Herterich
- Institute for Clinical Biochemistry and Pathobiochemistry, University of Würzburg, Germany. (S.H.)
| | - Medina Mamtimin
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
- Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians University Hospital, Munich, Germany (E.M.-B., M.M., H.C.)
| | - Akif Pinarci
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
| | - Sarah Beck
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
| | - Simon Stritt
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
| | - Han Chao
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
- Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians University Hospital, Munich, Germany (E.M.-B., M.M., H.C.)
| | - Pengxuan Ren
- School of Life Science and Technology, Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, China (P.R.)
| | - Jean-Noël Freund
- INSERM, IRFAC/UMR-S1113, FMTS, University of Strasbourg, France (J.-N.F.)
| | - Christian Klemann
- Department of Women and Child Health, Center of Pediatric Research (CPL), Hospital for Children and Adolescents, Leipzig University, Germany (C.K.)
| | - Felix C Ringshausen
- Department of Respiratory Medicine, Hannover Medical School (MHH), Germany. (F.C.R.)
- Biomedical Research in Obstructive and End-Stage Lung Disease Hannover (BREATH), German Center for Lung Research (DZL), Germany (F.C.R.)
| | - Johan W M Heemskerk
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, the Netherlands (J.W.M.H.)
| | - Alexander Dietrich
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
| | - Bernhard Nieswandt
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
| | - Guido Stoll
- Department of Neurology, University Hospital of Würzburg, Germany (M.K.S., P.K., G. Stoll)
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
| | - Attila Braun
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Germany. (S.K.G., K.S., S.B., S.S., B.N., A.B.)
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians University, Munich, Germany (E.M.-B., M.M., A.P., H.C., A.D., T.G., A.B.)
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7
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Mammadova-Bach E, Gudermann T, Braun A. Platelet Mechanotransduction: Regulatory Cross Talk Between Mechanosensitive Receptors and Calcium Channels. Arterioscler Thromb Vasc Biol 2023. [PMID: 37345523 DOI: 10.1161/atvbaha.123.318341] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
Blood flow-induced hemodynamic changes result in mechanical stress on blood cells and vessel walls. Increased shear stress can activate platelets and other circulating cells, triggering the rapid activation of receptors, calcium channels, and related signaling mechanisms. Shear stress can also modify the folding of extracellular molecules and directly activate mechanosensitive receptors and calcium channels. The mechanical movement of the ECM (extracellular matrix) and the intracellular cortical actin cytoskeleton can change the conformation of platelet receptors and gate channel pores in the plasma membrane. Mechanosensitive platelet receptors and their downstream signaling events and metabolic products can also indirectly activate calcium channels. While the molecular composite of mechanotransduction pathways has been described in mammals, shear stress-induced platelet receptors and their cross talk with calcium channels have been incompletely characterized. In this review, we discuss current knowledge about the role of mechanosensitive platelet receptors and calcium channels in shear-dependent platelet activation and arterial thrombus formation.
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Affiliation(s)
- Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University of Munich, Germany (E.M.-B., T.G., A.B.)
- Division of Nephrology, Department of Medicine IV, Ludwig Maximilian University Hospital, Munich, Germany (E.M.-B.)
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University of Munich, Germany (E.M.-B., T.G., A.B.)
- German Center for Lung Research, Munich, Germany (T.G.)
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig Maximilian University of Munich, Germany (E.M.-B., T.G., A.B.)
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8
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Nadezhdin KD, Correia L, Narangoda C, Patel DS, Neuberger A, Gudermann T, Kurnikova MG, Chubanov V, Sobolevsky AI. Structural mechanisms of TRPM7 activation and inhibition. Nat Commun 2023; 14:2639. [PMID: 37156763 PMCID: PMC10167348 DOI: 10.1038/s41467-023-38362-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 04/27/2023] [Indexed: 05/10/2023] Open
Abstract
The transient receptor potential channel TRPM7 is a master regulator of the organismal balance of divalent cations that plays an essential role in embryonic development, immune responses, cell mobility, proliferation, and differentiation. TRPM7 is implicated in neuronal and cardiovascular disorders, tumor progression and has emerged as a new drug target. Here we use cryo-EM, functional analysis, and molecular dynamics simulations to uncover two distinct structural mechanisms of TRPM7 activation by a gain-of-function mutation and by the agonist naltriben, which show different conformational dynamics and domain involvement. We identify a binding site for highly potent and selective inhibitors and show that they act by stabilizing the TRPM7 closed state. The discovered structural mechanisms provide foundations for understanding the molecular basis of TRPM7 channelopathies and drug development.
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Affiliation(s)
- Kirill D Nadezhdin
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA
| | - Leonor Correia
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Chamali Narangoda
- Chemistry Department, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Dhilon S Patel
- Chemistry Department, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Arthur Neuberger
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
- Comprehensive Pneumology Center, German Center for Lung Research (DZL), Munich, Germany
| | - Maria G Kurnikova
- Chemistry Department, Carnegie Mellon University, Pittsburgh, PA, USA.
| | - Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
| | - Alexander I Sobolevsky
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
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9
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Kruk L, Mamtimin M, Braun A, Anders HJ, Andrassy J, Gudermann T, Mammadova-Bach E. Inflammatory Networks in Renal Cell Carcinoma. Cancers (Basel) 2023; 15:cancers15082212. [PMID: 37190141 DOI: 10.3390/cancers15082212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/23/2023] [Accepted: 04/04/2023] [Indexed: 05/17/2023] Open
Abstract
Cancer-associated inflammation has been established as a hallmark feature of almost all solid cancers. Tumor-extrinsic and intrinsic signaling pathways regulate the process of cancer-associated inflammation. Tumor-extrinsic inflammation is triggered by many factors, including infection, obesity, autoimmune disorders, and exposure to toxic and radioactive substances. Intrinsic inflammation can be induced by genomic mutation, genome instability and epigenetic remodeling in cancer cells that promote immunosuppressive traits, inducing the recruitment and activation of inflammatory immune cells. In RCC, many cancer cell-intrinsic alterations are assembled, upregulating inflammatory pathways, which enhance chemokine release and neoantigen expression. Furthermore, immune cells activate the endothelium and induce metabolic shifts, thereby amplifying both the paracrine and autocrine inflammatory loops to promote RCC tumor growth and progression. Together with tumor-extrinsic inflammatory factors, tumor-intrinsic signaling pathways trigger a Janus-faced tumor microenvironment, thereby simultaneously promoting or inhibiting tumor growth. For therapeutic success, it is important to understand the pathomechanisms of cancer-associated inflammation, which promote cancer progression. In this review, we describe the molecular mechanisms of cancer-associated inflammation that influence cancer and immune cell functions, thereby increasing tumor malignancy and anti-cancer resistance. We also discuss the potential of anti-inflammatory treatments, which may provide clinical benefits in RCCs and possible avenues for therapy and future research.
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Affiliation(s)
- Linus Kruk
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Medina Mamtimin
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Hans-Joachim Anders
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Joachim Andrassy
- Division of General, Visceral, Vascular and Transplant Surgery, Hospital of LMU, 81377 Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- German Center for Lung Research (DZL), 80336 Munich, Germany
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
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10
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Geiger F, Zeitlmayr S, Staab-Weijnitz CA, Rajan S, Breit A, Gudermann T, Dietrich A. An Inhibitory Function of TRPA1 Channels in TGF-β1-driven Fibroblast-to-Myofibroblast Differentiation. Am J Respir Cell Mol Biol 2023; 68:314-325. [PMID: 36378826 DOI: 10.1165/rcmb.2022-0159oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
TRPA1 (transient receptor potential ankyrin 1) is a nonselective Ca2+-permeable cation channel, which was originally cloned from human lung fibroblasts (HLFs). TRPA1-mediated Ca2+ entry is evoked by exposure to several chemicals, including allyl isothiocyanate (AITC), and a protective effect of TRPA1 activation in the development of cardiac fibrosis has been proposed. Yet the function of TRPA1 in TGF-β1 (transforming growth factor-β1)-driven fibroblast-to-myofibroblast differentiation and the development of pulmonary fibrosis remains elusive. TRPA1 expression and function were analyzed in cultured primary HLFs, and mRNA concentrations were significantly reduced after adding TGF-β1. Expression of genes encoding fibrosis markers (e.g., ACTA2, SERPINE1 [plasminogen activator inhibitor 1], FN1 [fibronectin], COL1A1 [type I collagen]) was increased after siRNA-mediated downregulation of TRPA1 mRNA in HLFs. Moreover, AITC-induced Ca2+ entry in HLFs was decreased after TGF-β1 treatment and by application of TRPA1 siRNAs, while AITC treatment alone did not reduce cell viability or enhance apoptosis. Most interestingly, AITC-induced TRPA1 activation augmented ERK1/2 (extracellular signal-regulated kinase 1/2) and SMAD2 linker phosphorylation, which might inhibit TGF-β-receptor signaling. Our results suggest an inhibitory function of TRPA1 channels in TGF-β1-driven fibroblast-to-myofibroblast differentiation. Therefore, activation of TRPA1 channels might be protective during the development of pulmonary fibrosis in patients.
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Affiliation(s)
- Fabienne Geiger
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
| | - Sarah Zeitlmayr
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
| | - Claudia A Staab-Weijnitz
- Comprehensive Pneumology Center with the CPC-M BioArchive and Institute of Lung Health and Immunity, Helmholtz Center Munich, Member of the German Center for Lung Research, Munich, Germany
| | - Suhasini Rajan
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
| | - Alexander Dietrich
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research, Ludwig-Maximilians-University Munich, Munich, Germany, and
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11
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Khajavi N, Beck A, Riçku K, Beyerle P, Jacob K, Syamsul SF, Belkacemi A, Reinach PS, Schreier PC, Salah H, Popp T, Novikoff A, Breit A, Chubanov V, Müller TD, Zierler S, Gudermann T. TRPM7 kinase is required for insulin production and compensatory islet responses during obesity. JCI Insight 2023; 8:163397. [PMID: 36574297 PMCID: PMC9977431 DOI: 10.1172/jci.insight.163397] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
Most overweight individuals do not develop diabetes due to compensatory islet responses to restore glucose homeostasis. Therefore, regulatory pathways that promote β cell compensation are potential targets for treatment of diabetes. The transient receptor potential cation channel subfamily M member 7 protein (TRPM7), harboring a cation channel and a serine/threonine kinase, has been implicated in controlling cell growth and proliferation. Here, we report that selective deletion of Trpm7 in β cells disrupted insulin secretion and led to progressive glucose intolerance. We indicate that the diminished insulinotropic response in β cell-specific Trpm7-knockout mice was caused by decreased insulin production because of impaired enzymatic activity of this protein. Accordingly, high-fat-fed mice with a genetic loss of TRPM7 kinase activity displayed a marked glucose intolerance accompanied by hyperglycemia. These detrimental glucoregulatory effects were engendered by reduced compensatory β cell responses because of mitigated protein kinase B (AKT)/ERK signaling. Collectively, our data identify TRPM7 kinase as a potentially novel regulator of insulin synthesis, β cell dynamics, and glucose homeostasis under obesogenic diet.
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Affiliation(s)
- Noushafarin Khajavi
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Andreas Beck
- Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Klea Riçku
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Philipp Beyerle
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Katharina Jacob
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Sabrina F. Syamsul
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Anouar Belkacemi
- Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Peter S. Reinach
- Wenzhou Medical University, Ophthalmology Department, Wenzhou, China
| | - Pascale C.F. Schreier
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Houssein Salah
- Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Tanja Popp
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - Aaron Novikoff
- Institute of Diabetes and Obesity, Helmholtz Center Munich, Neuherberg, Germany.,German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Vladimir Chubanov
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Timo D. Müller
- Institute of Diabetes and Obesity, Helmholtz Center Munich, Neuherberg, Germany.,German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Susanna Zierler
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.,Institute of Pharmacology, Medical Faculty, Johannes Kepler University Linz, Linz, Austria
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.,German Center for Lung Research, Munich, Germany
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12
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Han C, Ren P, Mamtimin M, Kruk L, Sarukhanyan E, Li C, Anders HJ, Dandekar T, Krueger I, Elvers M, Goebel S, Adler K, Münch G, Gudermann T, Braun A, Mammadova-Bach E. Minimal Collagen-Binding Epitope of Glycoprotein VI in Human and Mouse Platelets. Biomedicines 2023; 11:biomedicines11020423. [PMID: 36830959 PMCID: PMC9952969 DOI: 10.3390/biomedicines11020423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/22/2023] [Accepted: 01/25/2023] [Indexed: 02/04/2023] Open
Abstract
Glycoprotein VI (GPVI) is a platelet-specific receptor for collagen and fibrin, regulating important platelet functions such as platelet adhesion and thrombus growth. Although the blockade of GPVI function is widely recognized as a potent anti-thrombotic approach, there are limited studies focused on site-specific targeting of GPVI. Using computational modeling and bioinformatics, we analyzed collagen- and CRP-binding surfaces of GPVI monomers and dimers, and compared the interacting surfaces with other mammalian GPVI isoforms. We could predict a minimal collagen-binding epitope of GPVI dimer and designed an EA-20 antibody that recognizes a linear epitope of this surface. Using platelets and whole blood samples donated from wild-type and humanized GPVI transgenic mice and also humans, our experimental results show that the EA-20 antibody inhibits platelet adhesion and aggregation in response to collagen and CRP, but not to fibrin. The EA-20 antibody also prevents thrombus formation in whole blood, on the collagen-coated surface, in arterial flow conditions. We also show that EA-20 does not influence GPVI clustering or receptor shedding. Therefore, we propose that blockade of this minimal collagen-binding epitope of GPVI with the EA-20 antibody could represent a new anti-thrombotic approach by inhibiting specific interactions between GPVI and the collagen matrix.
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Affiliation(s)
- Chao Han
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Pengxuan Ren
- School of Life Science and Technology, Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Medina Mamtimin
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Linus Kruk
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Edita Sarukhanyan
- Department of Bioinformatics, Biocenter, University of Würzburg, 97074 Würzburg, Germany
| | - Chenyu Li
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Hans-Joachim Anders
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
| | - Thomas Dandekar
- Department of Bioinformatics, Biocenter, University of Würzburg, 97074 Würzburg, Germany
| | - Irena Krueger
- Department of Vascular and Endovascular Surgery, Heinrich-Heine University Medical Center, 40225 Düsseldorf, Germany
| | - Margitta Elvers
- Department of Vascular and Endovascular Surgery, Heinrich-Heine University Medical Center, 40225 Düsseldorf, Germany
| | | | | | - Götz Münch
- AdvanceCOR GmbH, 82152 Martinsried, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- German Center for Lung Research (DZL), 80336 Munich, Germany
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Correspondence: (A.B.); (E.M.-B.)
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, 80336 Munich, Germany
- Division of Nephrology, Department of Medicine IV, Hospital of the Ludwig-Maximilian-University, 80336 Munich, Germany
- Correspondence: (A.B.); (E.M.-B.)
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13
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Steiner P, Arlt E, Boekhoff I, Gudermann T, Zierler S. TPC Functions in the Immune System. Handb Exp Pharmacol 2023; 278:71-92. [PMID: 36639434 DOI: 10.1007/164_2022_634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Two-pore channels (TPCs) are novel intracellular cation channels, which play a key role in numerous (patho-)physiological and immunological processes. In this chapter, we focus on their function in immune cells and immune reactions. Therefore, we first give an overview of the cellular immune response and the partaking immune cells. Second, we concentrate on ion channels which in the past have been shown to play an important role in the regulation of immune cells. The main focus is then directed to TPCs, which are primarily located in the membranes of acidic organelles, such as lysosomes or endolysosomes but also certain other vesicles. They regulate Ca2+ homeostasis and thus Ca2+ signaling in immune cells. Due to this important functional role, TPCs are enjoying increasing attention within the field of immunology in the last few decades but are also becoming more pertinent as pharmacological targets for the treatment of pro-inflammatory diseases such as allergic hypersensitivity. However, to uncover the precise molecular mechanism of TPCs in immune cell responses, further molecular, genetic, and ultrastructural investigations on TPCs are necessary, which then may pave the way to develop novel therapeutic strategies to treat diseases such as anaphylaxis more specifically.
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Affiliation(s)
- Philip Steiner
- Institute of Pharmacology, Faculty of Medicine, Johannes Kepler University Linz, Linz, Austria
| | - Elisabeth Arlt
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Ingrid Boekhoff
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Susanna Zierler
- Institute of Pharmacology, Faculty of Medicine, Johannes Kepler University Linz, Linz, Austria.
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany.
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14
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Kruk L, Braun A, Cosset E, Gudermann T, Mammadova-Bach E. Galectin functions in cancer-associated inflammation and thrombosis. Front Cardiovasc Med 2023; 10:1052959. [PMID: 36873388 PMCID: PMC9981828 DOI: 10.3389/fcvm.2023.1052959] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 01/12/2023] [Indexed: 02/19/2023] Open
Abstract
Galectins are carbohydrate-binding proteins that regulate many cellular functions including proliferation, adhesion, migration, and phagocytosis. Increasing experimental and clinical evidence indicates that galectins influence many steps of cancer development by inducing the recruitment of immune cells to the inflammatory sites and modulating the effector function of neutrophils, monocytes, and lymphocytes. Recent studies described that different isoforms of galectins can induce platelet adhesion, aggregation, and granule release through the interaction with platelet-specific glycoproteins and integrins. Patients with cancer and/or deep-venous thrombosis have increased levels of galectins in the vasculature, suggesting that these proteins could be important contributors to cancer-associated inflammation and thrombosis. In this review, we summarize the pathological role of galectins in inflammatory and thrombotic events, influencing tumor progression and metastasis. We also discuss the potential of anti-cancer therapies targeting galectins in the pathological context of cancer-associated inflammation and thrombosis.
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Affiliation(s)
- Linus Kruk
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Erika Cosset
- CRCL, UMR INSERM 1052, CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,German Center for Lung Research (DZL), Munich, Germany
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
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15
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Rister AB, Gudermann T, Schredelseker J. E as in Enigma: The Mysterious Role of the Voltage-Dependent Anion Channel Glutamate E73. Int J Mol Sci 2022; 24:ijms24010269. [PMID: 36613710 PMCID: PMC9820230 DOI: 10.3390/ijms24010269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/07/2022] [Accepted: 12/12/2022] [Indexed: 12/28/2022] Open
Abstract
The voltage-dependent anion channel (VDAC) is the main passageway for ions and metabolites over the outer mitochondrial membrane. It was associated with many physiological processes, including apoptosis and modulation of intracellular Ca2+ signaling. The protein is formed by a barrel of 19 beta-sheets with an N-terminal helix lining the inner pore. Despite its large diameter, the channel can change its selectivity for ions and metabolites based on its open state to regulate transport into and out of mitochondria. VDAC was shown to be regulated by a variety of cellular factors and molecular partners including proteins, lipids and ions. Although the physiological importance of many of these modulatory effects are well described, the binding sites for molecular partners are still largely unknown. The highly symmetrical and sleek structure of the channel makes predictions of functional moieties difficult. However, one residue repeatedly sticks out when reviewing VDAC literature. A glutamate at position 73 (E73) located on the outside of the channel facing the hydrophobic membrane environment was repeatedly proposed to be involved in channel regulation on multiple levels. Here, we review the distinct hypothesized roles of E73 and summarize the open questions around this mysterious residue.
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Affiliation(s)
- Alexander Bernhard Rister
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany
- Deutsches Zentrum für Herz-Kreislauf-Forschung, Partner Site Munich Heart Alliance, Munich, Germany
| | - Johann Schredelseker
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany
- Deutsches Zentrum für Herz-Kreislauf-Forschung, Partner Site Munich Heart Alliance, Munich, Germany
- Correspondence: ; Tel.: +49-(0)89-2180-73831
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16
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Spix B, Castiglioni AJ, Remis NN, Flores EN, Wartenberg P, Wyatt A, Boehm U, Gudermann T, Biel M, García-Añoveros J, Grimm C. Whole-body analysis of TRPML3 (MCOLN3) expression using a GFP-reporter mouse model reveals widespread expression in secretory cells and endocrine glands. PLoS One 2022; 17:e0278848. [PMID: 36520788 PMCID: PMC10045552 DOI: 10.1371/journal.pone.0278848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/27/2022] [Indexed: 12/23/2022] Open
Abstract
TRPML3 (mucolipin 3, MCOLN3) is an endolysosomal cation channel belonging to the TRPML subfamily of transient receptor potential channels. Gain-of-function mutations in the Trpml3 gene cause deafness, circling behavior and coat color dilution in mice due to cell death of TRPML3-expressing hair cells of the inner ear or skin melanocytes, respectively. Furthermore, TRPML3 was found to play a role in the long term survival of cochlear hair cells (its absence contributing to presbycusis), in specialized giant lysosomes that neonatal (birth to weaning) enterocytes used for the uptake and digestion of maternal milk nutrients, and in the expulsion of exosome-encased bacteria such as uropathogenic E. coli, infecting bladder epithelial cells. Recently, TRPML3 was found to be expressed at high levels in alveolar macrophages and loss of TRPML3 results in a lung emphysema phenotype, confirmed in two independently engineered Trpml3 knockout lines. TRPML3 is not ubiquitously expressed like its relative TRPML1 and thus cellular expression of TRPML3 on a whole-tissue level remains, with the exceptions mentioned above, largely elusive. To overcome this problem, we generated a τGFP reporter mouse model for TRPML3 and compared expression data obtained from this model by immunofluorescence on tissue sections with immunohistochemistry using TRPML3 antibodies and in situ hybridization. We thus uncovered expression in several organs and distinct cell types. We confirmed TRPML3 expression in both neonatal and adult alveolar macrophages, in melanocytes of hair follicles and glabrous skin, in principle cells of the collecting duct of the neonatal and adult kidney, and in olfactory sensory neurons of the olfactory epithelium, including its fibres protruding to the glomeruli of the olfactory bulb. Additionally, we localized TRPML3 in several glands including parathyroid, thyroid, salivary, adrenal, and pituitary gland, testes and ovaries, suggestive of potential roles for the channel in secretion or uptake of different hormones.
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Affiliation(s)
- Barbara Spix
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Andrew J. Castiglioni
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
| | - Natalie N. Remis
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- Integrated Graduate Program in the Life Sciences (IGP), Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
| | - Emma N. Flores
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- Northwestern University Interdepartmental Neuroscience (NUIN) graduate program, Chicago, Illinois, United States of America
| | - Philipp Wartenberg
- Center for Molecular Signaling (PZMS), Experimental Pharmacology, Saarland University, Homburg, Germany
| | - Amanda Wyatt
- Center for Molecular Signaling (PZMS), Experimental Pharmacology, Saarland University, Homburg, Germany
| | - Ulrich Boehm
- Center for Molecular Signaling (PZMS), Experimental Pharmacology, Saarland University, Homburg, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Martin Biel
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany
| | - Jaime García-Añoveros
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- Integrated Graduate Program in the Life Sciences (IGP), Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- Northwestern University Interdepartmental Neuroscience (NUIN) graduate program, Chicago, Illinois, United States of America
- Departments of Neurology and Neuroscience, and Hugh Knowles Center for Clinical and Basic Science in Hearing and Its Disorders, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- * E-mail: (JGA); (CG)
| | - Christian Grimm
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
- * E-mail: (JGA); (CG)
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17
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Malkmus K, Brosien M, Knoepp F, Schaffelhofer L, Grimminger F, Rummel C, Gudermann T, Dietrich A, Birnbaumer L, Weissmann N, Kraut S. Deletion of classical transient receptor potential 1, 3 and 6 alters pulmonary vasoconstriction in chronic hypoxia-induced pulmonary hypertension in mice. Front Physiol 2022; 13:1080875. [PMID: 36569761 PMCID: PMC9768328 DOI: 10.3389/fphys.2022.1080875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
Chronic hypoxia-induced pulmonary hypertension (CHPH) is a severe disease that is characterized by increased proliferation and migration of pulmonary arterial smooth muscle cells (PASMCs) leading to pulmonary vascular remodeling. The resulting increase in pulmonary vascular resistance (PVR) causes right ventricular hypertrophy and ultimately right heart failure. In addition, increased PVR can also be a consequence of hypoxic pulmonary vasoconstriction (HPV) under generalized hypoxia. Increased proliferation and migration of PASMCs are often associated with high intracellular Ca2+ concentration. Recent publications suggest that Ca2+-permeable nonselective classical transient receptor potential (TRPC) proteins-especially TRPC1 and 6-are crucially involved in acute and sustained hypoxic responses and the pathogenesis of CHPH. The aim of our study was to investigate whether the simultaneous deletion of TRPC proteins 1, 3 and 6 protects against CHPH-development and affects HPV in mice. We used a mouse model of chronic hypoxia as well as isolated, ventilated and perfused mouse lungs and PASMC cell cultures. Although right ventricular systolic pressure as well as echocardiographically assessed PVR and right ventricular wall thickness (RVWT) were lower in TRPC1, 3, 6-deficient mice, these changes were not related to a decreased degree of pulmonary vascular muscularization and a reduced proliferation of PASMCs. However, both acute and sustained HPV were almost absent in the TRPC1, 3, 6-deficient mice and their vasoconstrictor response upon KCl application was reduced. This was further validated by myographical experiments. Our data revealed that 1) TRPC1, 3, 6-deficient mice are partially protected against development of CHPH, 2) these changes may be caused by diminished HPV and not an altered pulmonary vascular remodeling.
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Affiliation(s)
- Kathrin Malkmus
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Monika Brosien
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Fenja Knoepp
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Lisa Schaffelhofer
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Friedrich Grimminger
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Christoph Rummel
- Institute of Veterinary Physiology and Biochemistry, Justus-Liebig-University, Giessen, Germany
| | - Thomas Gudermann
- Walther Straub Institute for Pharmacology and Toxicology, Member of the DZL, Ludwig Maximilians University, Munich, Germany
| | - Alexander Dietrich
- Walther Straub Institute for Pharmacology and Toxicology, Member of the DZL, Ludwig Maximilians University, Munich, Germany
| | - Lutz Birnbaumer
- Institute of Biomedical Research (BIOMED), Catholic University of Argentina, Buenos Aires, Argentina,Laboratory of Signal Transduction, National Institute of Environmental Health Sciences (NIEHS), Durham, United States
| | - Norbert Weissmann
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Simone Kraut
- Cardiopulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany,*Correspondence: Simone Kraut,
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18
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Kazandzhieva K, Mammadova-Bach E, Dietrich A, Gudermann T, Braun A. TRP channel function in platelets and megakaryocytes: basic mechanisms and pathophysiological impact. Pharmacol Ther 2022; 237:108164. [PMID: 35247518 DOI: 10.1016/j.pharmthera.2022.108164] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/29/2022] [Accepted: 02/28/2022] [Indexed: 12/30/2022]
Abstract
Transient receptor potential (TRP) proteins form a superfamily of cation channels that are expressed in a wide range of tissues and cell types. During the last years, great progress has been made in understanding the molecular complexity and the functions of TRP channels in diverse cellular processes, including cell proliferation, migration, adhesion and activation. The diversity of functions depends on multiple regulatory mechanisms by which TRP channels regulate Ca2+ entry mechanisms and intracellular Ca2+ dynamics, either through membrane depolarization involving cation influx or store- and receptor-operated mechanisms. Abnormal function or expression of TRP channels results in vascular pathologies, including hypertension, ischemic stroke and inflammatory disorders through effects on vascular cells, including the components of blood vessels and platelets. Moreover, some TRP family members also regulate megakaryopoiesis and platelet production, indicating a complex role of TRP channels in pathophysiological conditions. In this review, we describe potential roles of TRP channels in megakaryocytes and platelets, as well as their contribution to diseases such as thrombocytopenia, thrombosis and stroke. We also critically discuss the potential of TRP channels as possible targets for disease prevention and treatment.
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Affiliation(s)
- Kalina Kazandzhieva
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany; Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Alexander Dietrich
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany; German Center for Lung Research (DZL), Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany; German Center for Lung Research (DZL), Munich, Germany.
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.
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19
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Rössig A, Hill K, Nörenberg W, Weidenbach S, Zierler S, Schaefer M, Gudermann T, Chubanov V. Pharmacological agents selectively acting on the channel moieties of TRPM6 and TRPM7. Cell Calcium 2022; 106:102640. [PMID: 36030694 DOI: 10.1016/j.ceca.2022.102640] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 08/10/2022] [Accepted: 08/14/2022] [Indexed: 11/18/2022]
Abstract
The transient receptor potential cation channel, subfamily M, members 6 and 7 (TRPM6 and TRPM7) are homologous membrane proteins encompassing cation channel units fused to cytosolic serine/threonine-protein kinase domains. Clinical studies and experiments with animal disease models suggested that selective inhibition of TRPM6 and TRPM7 currents might be beneficial for subjects with immune and cardiovascular disorders, tumours and other pathologies, but the suitable pharmacological toolkit remains underdeveloped. The present study identified small synthetic molecules acting specifically on the channel moieties of TRPM6 and TRPM7. Using electrophysiological analysis in conjunction with Ca2+ imaging, we show that iloperidone and ifenprodil inhibit the channel activity of recombinant TRPM6 with IC50 values of 0.73 and 3.33 µM, respectively, without an impact on the TRPM7 channel. We also found that VER155008 suppresses the TRPM7 channel with an IC50 value of 0.11 µM but does not affect TRPM6. Finally, the effects of iloperidone and VER155008 were found to be suitable for blocking native endogenous TRPM6 and TRPM7 in a collection of mouse and human cell models. Hence, the identification of iloperidone, ifenprodil, and VER155008 allows for the first time to selectively manipulate TRPM6 and TRPM7 currents.
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Affiliation(s)
- Anna Rössig
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Kerstin Hill
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Wolfgang Nörenberg
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Sebastian Weidenbach
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Susanna Zierler
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany; Institute of Pharmacology, Johannes Kepler University Linz, Linz, Austria
| | - Michael Schaefer
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany; Comprehensive Pneumology Center, a member of the German Center for Lung Research (DZL), Munich, Germany.
| | - Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
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20
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Hollenhorst MI, Kumar P, Zimmer M, Salah A, Maxeiner S, Elhawy MI, Evers SB, Flockerzi V, Gudermann T, Chubanov V, Boehm U, Krasteva-Christ G. Taste Receptor Activation in Tracheal Brush Cells by Denatonium Modulates ENaC Channels via Ca2+, cAMP and ACh. Cells 2022; 11:cells11152411. [PMID: 35954259 PMCID: PMC9367940 DOI: 10.3390/cells11152411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/23/2022] [Accepted: 08/03/2022] [Indexed: 02/04/2023] Open
Abstract
Mucociliary clearance is a primary defence mechanism of the airways consisting of two components, ciliary beating and transepithelial ion transport (ISC). Specialised chemosensory cholinergic epithelial cells, named brush cells (BC), are involved in regulating various physiological and immunological processes. However, it remains unclear if BC influence ISC. In murine tracheae, denatonium, a taste receptor agonist, reduced basal ISC in a concentration-dependent manner (EC50 397 µM). The inhibition of bitter taste signalling components with gallein (Gβγ subunits), U73122 (phospholipase C), 2-APB (IP3-receptors) or with TPPO (Trpm5, transient receptor potential-melastatin 5 channel) reduced the denatonium effect. Supportively, the ISC was also diminished in Trpm5−/− mice. Mecamylamine (nicotinic acetylcholine receptor, nAChR, inhibitor) and amiloride (epithelial sodium channel, ENaC, antagonist) decreased the denatonium effect. Additionally, the inhibition of Gα subunits (pertussis toxin) reduced the denatonium effect, while an inhibition of phosphodiesterase (IBMX) increased and of adenylate cyclase (forskolin) reversed the denatonium effect. The cystic fibrosis transmembrane conductance regulator (CFTR) inhibitor CFTRinh172 and the KCNQ1 potassium channel antagonist chromanol 293B both reduced the denatonium effect. Thus, denatonium reduces ISC via the canonical bitter taste signalling cascade leading to the Trpm5-dependent nAChR-mediated inhibition of ENaC as well as Gα signalling leading to a reduction in cAMP-dependent ISC. Therefore, BC activation contributes to the regulation of fluid homeostasis.
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Affiliation(s)
| | - Praveen Kumar
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Maxim Zimmer
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Alaa Salah
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Stephan Maxeiner
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | | | - Saskia B. Evers
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
| | - Veit Flockerzi
- Institute for Experimental and Clinical Pharmacology and Toxicology, Centre for Molecular Signalling, Saarland University, 66421 Homburg, Germany
| | - Thomas Gudermann
- Walter-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University and German Centre for Lung Research (DZL), 80366 Munich, Germany
| | - Vladimir Chubanov
- Walter-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University and German Centre for Lung Research (DZL), 80366 Munich, Germany
| | - Ulrich Boehm
- Experimental Pharmacology, Centre for Molecular Signalling, School of Medicine, Saarland University, 66421 Homburg, Germany
| | - Gabriela Krasteva-Christ
- Institute of Anatomy and Cell Biology, Saarland University, 66421 Homburg, Germany
- Correspondence: ; Tel.: +49-6841-16-26101
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21
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Zeitlmayr S, Zierler S, Staab-Weijnitz CA, Dietrich A, Geiger F, Horgen FD, Gudermann T, Breit A. TRPM7 restrains plasmin activity and promotes transforming growth factor-β1 signaling in primary human lung fibroblasts. Arch Toxicol 2022; 96:2767-2783. [PMID: 35864199 PMCID: PMC9302958 DOI: 10.1007/s00204-022-03342-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 07/14/2022] [Indexed: 02/07/2023]
Abstract
Sustained exposure of the lung to various environmental or occupational toxins may eventually lead to pulmonary fibrosis, a devastating disease with no cure. Pulmonary fibrosis is characterized by excessive deposition of extracellular matrix (ECM) proteins such as fibronectin and collagens. The peptidase plasmin degrades the ECM, but protein levels of the plasmin activator inhibitor-1 (PAI-1) are increased in fibrotic lung tissue, thereby dampening plasmin activity. Transforming growth factor-β1 (TGF-β1)-induced activation of SMAD transcription factors promotes ECM deposition by enhancing collagen, fibronectin and PAI-1 levels in pulmonary fibroblasts. Hence, counteracting TGF-β1-induced signaling is a promising approach for the therapy of pulmonary fibrosis. Transient receptor potential cation channel subfamily M Member 7 (TRPM7) supports TGF-β1-promoted SMAD signaling in T-lymphocytes and the progression of fibrosis in kidney and heart. Thus, we investigated possible effects of TRPM7 on plasmin activity, ECM levels and TGF-β1 signaling in primary human pulmonary fibroblasts (pHPF). We found that two structurally unrelated TRPM7 blockers enhanced plasmin activity and reduced fibronectin or PAI-1 protein levels in pHPF under basal conditions. Further, TRPM7 blockade strongly inhibited fibronectin and collagen deposition induced by sustained TGF-β1 stimulation. In line with these data, inhibition of TRPM7 activity diminished TGF-β1-triggered phosphorylation of SMAD-2, SMAD-3/4-dependent reporter activation and PAI-1 mRNA levels. Overall, we uncover TRPM7 as a novel supporter of TGF-β1 signaling in pHPF and propose TRPM7 blockers as new candidates to control excessive ECM levels under pathophysiological conditions conducive to pulmonary fibrosis.
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Affiliation(s)
- Sarah Zeitlmayr
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Susanna Zierler
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany.,Faculty of Medicine, Johannes Kepler University, Life Science Park, Huemerstraße 3-5, 4020, Linz, Austria
| | - Claudia A Staab-Weijnitz
- Institute of Lung Health and Immunity and Comprehensive Pneumology Center, Helmholtz Zentrum München GmbH, Member of the German Center for Lung Research, Max-Lebsche-Platz 31, 81377, Munich, Germany
| | - Alexander Dietrich
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Fabienne Geiger
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - F David Horgen
- Department of Natural Sciences, Hawaii Pacific University, Kaneohe, HI, 96744, USA
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany
| | - Andreas Breit
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, LMU Munich, Goethestrasse 33, 80336, Munich, Germany.
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22
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Mamtimin M, Pinarci A, Han C, Braun A, Anders HJ, Gudermann T, Mammadova-Bach E. Extracellular DNA Traps: Origin, Function and Implications for Anti-Cancer Therapies. Front Oncol 2022; 12:869706. [PMID: 35574410 PMCID: PMC9092261 DOI: 10.3389/fonc.2022.869706] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 03/07/2022] [Indexed: 12/16/2022] Open
Abstract
Extracellular DNA may serve as marker in liquid biopsies to determine individual diagnosis and prognosis in cancer patients. Cell death or active release from various cell types, including immune cells can result in the release of DNA into the extracellular milieu. Neutrophils are important components of the innate immune system, controlling pathogens through phagocytosis and/or the release of neutrophil extracellular traps (NETs). NETs also promote tumor progression and metastasis, by modulating angiogenesis, anti-tumor immunity, blood clotting and inflammation and providing a supportive niche for metastasizing cancer cells. Besides neutrophils, other immune cells such as eosinophils, dendritic cells, monocytes/macrophages, mast cells, basophils and lymphocytes can also form extracellular traps (ETs) during cancer progression, indicating possible multiple origins of extracellular DNA in cancer. In this review, we summarize the pathomechanisms of ET formation generated by different cell types, and analyze these processes in the context of cancer. We also critically discuss potential ET-inhibiting agents, which may open new therapeutic strategies for cancer prevention and treatment.
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Affiliation(s)
- Medina Mamtimin
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Akif Pinarci
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Chao Han
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Hans-Joachim Anders
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,German Center for Lung Research, Munich, Germany
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
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23
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Hollenhorst MI, Nandigama R, Evers SB, Gamayun I, Abdel Wadood N, Salah A, Pieper M, Wyatt A, Stukalov A, Gebhardt A, Nadolni W, Burow W, Herr C, Beisswenger C, Kusumakshi S, Ectors F, Kichko TI, Hübner L, Reeh P, Munder A, Wienhold SM, Witzenrath M, Bals R, Flockerzi V, Gudermann T, Bischoff M, Lipp P, Zierler S, Chubanov V, Pichlmair A, König P, Boehm U, Krasteva-Christ G. Bitter taste signaling in tracheal epithelial brush cells elicits innate immune responses to bacterial infection. J Clin Invest 2022; 132:150951. [PMID: 35503420 PMCID: PMC9246383 DOI: 10.1172/jci150951] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 04/29/2022] [Indexed: 11/17/2022] Open
Abstract
Constant exposure of the airways to inhaled pathogens requires efficient early immune responses protecting against infections. How bacteria on the epithelial surface are detected and first-line protective mechanisms are initiated are not well understood. We have recently shown that tracheal brush cells (BCs) express functional taste receptors. Here we report that bitter taste signaling in murine BCs induces neurogenic inflammation. We demonstrate that BC signaling stimulates adjacent sensory nerve endings in the trachea to release the neuropeptides CGRP and substance P that mediate plasma extravasation, neutrophil recruitment, and diapedesis. Moreover, we show that bitter tasting quorum-sensing molecules from Pseudomonas aeruginosa activate tracheal BCs. BC signaling depends on the key taste transduction gene Trpm5, triggers secretion of immune mediators, among them the most abundant member of the complement system, and is needed to combat P. aeruginosa infections. Our data provide functional insight into first-line defense mechanisms against bacterial infections of the lung.
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Affiliation(s)
| | - Rajender Nandigama
- Institute of Anatomy and Cell Biology, Julius-Maximilians-University, Würzburg, Germany
| | - Saskia B Evers
- Institute of Anatomy and Cell Biology, Saarland University, Homburg, Germany
| | - Igor Gamayun
- Institute for Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Noran Abdel Wadood
- Institute of Anatomy and Cell Biology, Saarland University, Homburg, Germany
| | - Alaa Salah
- Institute of Anatomy and Cell Biology, Saarland University, Homburg, Germany
| | - Mario Pieper
- Institute of Anatomy, University of Luebeck, Luebeck, Germany
| | - Amanda Wyatt
- Institute for Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Alexey Stukalov
- Immunopathology of Virus Infection Laboratory, Institute of Virology, Technical University of Munich, Munich, Germany
| | - Anna Gebhardt
- Immunopathology of Virus Infection Laboratory, Institute of Virology, Technical University of Munich, Munich, Germany
| | - Wiebke Nadolni
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Wera Burow
- Institute of Anatomy and Cell Biology, Julius-Maximilians-University, Würzburg, Germany
| | - Christian Herr
- Department of Internal Medicine V, Saarland University Hospital, Homburg, Germany
| | | | - Soumya Kusumakshi
- Institute for Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Fabien Ectors
- FARAH Mammalian Transgenics Platform, Liège University, Liège, Belgium
| | - Tatjana I Kichko
- Institute of Physiology and Pathophysiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Lisa Hübner
- Institute of Anatomy and Cell Biology, Julius-Maximilians-University, Würzburg, Germany
| | - Peter Reeh
- Institute of Physiology and Pathophysiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Antje Munder
- Clinic for Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hannover, Germany
| | - Sandra-Maria Wienhold
- Department of Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Martin Witzenrath
- Department of Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Robert Bals
- Department of Internal Medicine V, Saarland University Hospital, Homburg, Germany
| | - Veit Flockerzi
- Institute for Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Markus Bischoff
- Institute for Medical Microbiology and Hygiene, Saarland University, Homburg, Germany
| | - Peter Lipp
- Institute for Molecular Cell Biology, Saarland University, Homburg, Germany
| | - Susanna Zierler
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Vladimir Chubanov
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians-University, Munich, Germany
| | - Andreas Pichlmair
- Immunopathology of Virus Infection Laboratory, Institute of Virology, Technical University of Munich, Munich, Germany
| | - Peter König
- Institute of Anatomy, University of Luebeck, Luebeck, Germany
| | - Ulrich Boehm
- Institute for Experimental and Clinical Pharmacology and Toxicology, Saarland University, Homburg, Germany
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24
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Steiner P, Arlt E, Boekhoff I, Gudermann T, Zierler S. Two-Pore Channels Regulate Inter-Organellar Ca 2+ Homeostasis in Immune Cells. Cells 2022; 11:1465. [PMID: 35563771 PMCID: PMC9103377 DOI: 10.3390/cells11091465] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/13/2022] [Accepted: 04/16/2022] [Indexed: 02/01/2023] Open
Abstract
Two-pore channels (TPCs) are ligand-gated cation-selective ion channels that are preserved in plant and animal cells. In the latter, TPCs are located in membranes of acidic organelles, such as endosomes, lysosomes, and endolysosomes. Here, we focus on the function of these unique ion channels in mast cells, which are leukocytes that mature from myeloid hematopoietic stem cells. The cytoplasm of these innate immune cells contains a large number of granules that comprise messenger substances, such as histamine and heparin. Mast cells, along with basophil granulocytes, play an essential role in anaphylaxis and allergic reactions by releasing inflammatory mediators. Signaling in mast cells is mainly regulated via the release of Ca2+ from the endoplasmic reticulum as well as from acidic compartments, such as endolysosomes. For the crosstalk of these organelles TPCs seem essential. Allergic reactions and anaphylaxis were previously shown to be associated with the endolysosomal two-pore channel TPC1. The release of histamine, controlled by intracellular Ca2+ signals, was increased upon genetic or pharmacologic TPC1 inhibition. Conversely, stimulation of TPC channel activity by one of its endogenous ligands, namely nicotinic adenine dinucleotide phosphate (NAADP) or phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), were found to trigger the release of Ca2+ from the endolysosomes; thereby improving the effect of TPC1 on regulated mast cell degranulation. In this review we discuss the importance of TPC1 for regulating Ca2+ homeostasis in mast cells and the overall potential of TPC1 as a pharmacological target in anti-inflammatory therapy.
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Affiliation(s)
- Philip Steiner
- Institute of Pharmacology, Medical Faculty, Johannes Kepler University Linz, 4020 Linz, Austria;
| | - Elisabeth Arlt
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, Ludwig Maximilians University Munich, 80336 Munich, Germany; (E.A.); (I.B.); (T.G.)
| | - Ingrid Boekhoff
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, Ludwig Maximilians University Munich, 80336 Munich, Germany; (E.A.); (I.B.); (T.G.)
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, Ludwig Maximilians University Munich, 80336 Munich, Germany; (E.A.); (I.B.); (T.G.)
| | - Susanna Zierler
- Institute of Pharmacology, Medical Faculty, Johannes Kepler University Linz, 4020 Linz, Austria;
- Walther Straub Institute of Pharmacology and Toxicology, Medical Faculty, Ludwig Maximilians University Munich, 80336 Munich, Germany; (E.A.); (I.B.); (T.G.)
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25
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Jiang T, Samapati R, Klassen S, Lei D, Erfinanda L, Jankowski V, Simmons S, Yin J, Arenz C, Dietrich A, Gudermann T, Adam D, Schaefer M, Jankowski J, Flockerzi V, Nüsing R, Uhlig S, Kuebler WM. Stimulation of the EP 3 receptor causes lung edema by activation of TRPC6 in pulmonary endothelial cells. Eur Respir J 2022; 60:13993003.02635-2021. [PMID: 35450969 DOI: 10.1183/13993003.02635-2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 02/17/2022] [Indexed: 11/05/2022]
Abstract
BACKGROUND Prostaglandin E2 (PGE2) increases pulmonary vascular permeability by activation of the PGE2 receptor 3 (EP3) which may explain adverse pulmonary effects of the EP1/EP3 receptor agonist sulprostone in patients. PGE2 also contributes to pulmonary edema in response to platelet-activating factor (PAF). PAF increases endothelial permeability by recruiting the cation channel transient receptor potential canonical 6 (TRPC6) to endothelial caveolae via acid sphingomyelinase (ASMase). Yet, the roles of PGE2 and EP3 in this pathway are unknown. We hypothesized that EP3 receptor activation may increase pulmonary vascular permeability by activation of TRPC6, and thus, synergize with ASMase-mediated TRPC6 recruitment in PAF-induced lung edema. METHODS In isolated lungs, we measured increases in endothelial Ca2+ (ΔCa2+) or lung weight (Δweight), and endothelial caveolar TRPC6 abundance as well as phosphorylation. RESULTS PAF-induced ΔCa2+ and Δweight were attenuated in EP3-deficient mice. Sulprostone replicated PAF-induced ΔCa2+ and Δweight which were blocked by pharmacologic/genetic inhibition of TRPC6, ASMase, or Src-family kinases (SrcFK). PAF, yet not sulprostone, increased TRPC6 abundance in endothelial caveolae. Immunoprecipitation revealed PAF- and sulprostone-induced tyrosine-phosphorylation of TRPC6 that was prevented by inhibition of phospholipase C (PLC) or SrcFK. PLC inhibition also blocked sulprostone-induced ΔCa2+ and Δweight, as did inhibition of SrcFK or Gi signaling. CONCLUSIONS EP3 activation triggers pulmonary edema via Gi-dependent activation of PLC and subsequent SrcFK-dependent tyrosine phosphorylation of TRPC6. In PAF-induced lung edema this TRPC6 activation coincides with ASMase-dependent caveolar recruitment of TRPC6, resulting in rapid endothelial Ca2+ influx and barrier failure.
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Affiliation(s)
- Tian Jiang
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany.,Department of Thoracic Surgery, Zhongshan Hospital Fudan University, 200032 Shanghai, China
| | - Rudi Samapati
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany
| | - Sergej Klassen
- Institute of Pharmacology and Toxicology, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Disi Lei
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany
| | - Lasti Erfinanda
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany
| | - Vera Jankowski
- Institute for Molecular and Cardiovascular Research, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Szandor Simmons
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany
| | - Jun Yin
- Department of Thoracic Surgery, Zhongshan Hospital Fudan University, 200032 Shanghai, China
| | - Christoph Arenz
- Institute for Chemistry, Humboldt University Berlin, 12489 Berlin, Germany
| | - Alexander Dietrich
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians University Munich, 80336 Munich, Germany.,Comprehensive Pneumology Center Munich (CPC-M), German Center for Lung Research, 81377 Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians University Munich, 80336 Munich, Germany.,Comprehensive Pneumology Center Munich (CPC-M), German Center for Lung Research, 81377 Munich, Germany
| | - Dieter Adam
- Institute for Immunology, Christian-Albrechts University Kiel, 24105 Kiel, Germany
| | - Michael Schaefer
- Rudolf-Boehm-Institute of Pharmacology and Toxicology, University of Leipzig, 04107 Leipzig, Germany
| | - Joachim Jankowski
- Institute for Molecular and Cardiovascular Research, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Veit Flockerzi
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of the Saarland, 66123 Saarbruecken, Germany
| | - Rolf Nüsing
- Dept. of Clinical Pharmacology, Johann-Wolfgang-Goethe University, 60590 Frankfurt, Germany
| | - Stefan Uhlig
- Institute of Pharmacology and Toxicology, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany.,These authors share the last authorship
| | - Wolfgang M Kuebler
- Institute for Physiology, Charité - Universitätsmedizin Berlin, corporate member of the Free University Berlin and the Humboldt University Berlin, 10117 Berlin, Germany .,The Keenan Research Centre for Biomedical Science at St. Michael's, Toronto M5B 1W8, ON; and Depts. of Surgery and Physiology, University of Toronto, Toronto M5S 2J7.,These authors share the last authorship
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26
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Schmidt E, Narangoda C, Nörenberg W, Egawa M, Rössig A, Leonhardt M, Schaefer M, Zierler S, Kurnikova MG, Gudermann T, Chubanov V. Structural mechanism of TRPM7 channel regulation by intracellular magnesium. Cell Mol Life Sci 2022; 79:225. [PMID: 35389104 PMCID: PMC8989868 DOI: 10.1007/s00018-022-04192-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 01/26/2022] [Accepted: 02/02/2022] [Indexed: 01/03/2023]
Abstract
Zn2+, Mg2+ and Ca2+ are essential divalent cations implicated in many metabolic processes and signalling pathways. An emerging new paradigm is that the organismal balance of these cations predominantly depends on a common gatekeeper, the channel-kinase TRPM7. Despite extensive electrophysiological studies and recent cryo-EM analysis, an open question is how the channel activity of TRPM7 is activated. Here, we performed site-directed mutagenesis of mouse TRPM7 in conjunction with patch-clamp assessment of whole-cell and single-channel activity and molecular dynamics (MD) simulations to show that the side chains of conserved N1097 form an inter-subunit Mg2+ regulatory site located in the lower channel gate of TRPM7. Our results suggest that intracellular Mg2+ binds to this site and stabilizes the TRPM7 channel in the closed state, whereas the removal of Mg2+ favours the opening of TRPM7. Hence, our study identifies the structural underpinnings through which the TRPM7 channel is controlled by cytosolic Mg2+, representing a new structure–function relationship not yet explored among TRPM channels.
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Affiliation(s)
- Eva Schmidt
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Chamali Narangoda
- Chemistry Department, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Wolfgang Nörenberg
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Miyuki Egawa
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Anna Rössig
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Marion Leonhardt
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Michael Schaefer
- Rudolf-Boehm Institute of Pharmacology and Toxicology, Leipzig University, Leipzig, Germany
| | - Susanna Zierler
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.,Institute of Pharmacology, Johannes Kepler University Linz, Linz, Austria
| | - Maria G Kurnikova
- Chemistry Department, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany. .,Comprehensive Pneumology Center, a member of the German Center for Lung Research (DZL), Munich, Germany.
| | - Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
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27
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Schremmer C, Steinritz D, Gudermann T, Beech DJ, Dietrich A. An ex vivo perfused ventilated murine lung model suggests lack of acute pulmonary toxicity of the potential novel anticancer agent (-)-englerin A. Arch Toxicol 2022; 96:1055-1063. [PMID: 35165752 PMCID: PMC8921049 DOI: 10.1007/s00204-022-03235-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 01/20/2022] [Indexed: 12/19/2022]
Abstract
(-)-Englerin A (EA), a potential novel anti-cancer drug, is a potent selective activator of classical transient receptor potential 4 and 5 (TRPC4, TRPC5) channels. As TRPC4 channels are expressed and functional in the lung endothelium, possible side effects such as lung edema formation may arise during its administration. Well-established in vivo rodent models for toxicological testing, however, rapidly degrade this compound to its inactive derivative, englerin B. Therefore, we chose an ex vivo isolated perfused and ventilated murine lung (IPVML) model to detect edema formation due to toxicants, which also reduces the number of incriminating animal experiments required. To evaluate the sensitivity of the IPVML model, short-time (10 min) drops of the pH from 7.4 down to 4.0 were applied, which resulted in linear changes of tidal volumes, wet-to-dry weight ratios and incorporation of FITC-coupled dextran particles from the perfusate. As expected, biological activity of EA was preserved after perfusion in the IPVML model. Concentrations of 50-100 nM EA continuously perfused through the IPVML model did not change tidal volumes and lung weights significantly. Wet-to-dry weight ratios were increased after perfusion of 100 nM EA but permeation of FITC-coupled dextran particles from the perfusate to the lung tissues was not significantly different. Therefore, EA shows little or no significant acute pulmonary toxicity after application of doses expected to activate target ion channels and the IPVML is a sensitive powerful ex vivo model for evaluating acute lung toxicity in accordance with the 3R rules for animal experimentation.
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Affiliation(s)
- Christian Schremmer
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research (DZL), Medical Faculty, LMU-Munich, Nussbaum Str. 26, 80336, Munich, Germany
| | - Dirk Steinritz
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research (DZL), Medical Faculty, LMU-Munich, Nussbaum Str. 26, 80336, Munich, Germany
| | - David J Beech
- School of Medicine, University of Leeds, LIGHT Building, Clarendon Way, Leeds, LS2 9JT, England, UK
| | - Alexander Dietrich
- Walther Straub Institute of Pharmacology and Toxicology, Member of the German Center for Lung Research (DZL), Medical Faculty, LMU-Munich, Nussbaum Str. 26, 80336, Munich, Germany.
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28
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Immler R, Nadolni W, Bertsch A, Morikis V, Rohwedder I, Masgrau-Alsina S, Schroll T, Yevtushenko A, Soehnlein O, Moser M, Gudermann T, Barnea ER, Rehberg M, Simon SI, Zierler S, Pruenster M, Sperandio M. The voltage-gated potassium channel KV1.3 regulates neutrophil recruitment during inflammation. Cardiovasc Res 2022; 118:1289-1302. [PMID: 33881519 PMCID: PMC8953450 DOI: 10.1093/cvr/cvab133] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 04/20/2021] [Indexed: 12/25/2022] Open
Abstract
AIMS Neutrophil trafficking within the vasculature strongly relies on intracellular calcium signalling. Sustained Ca2+ influx into the cell requires a compensatory efflux of potassium to maintain membrane potential. Here, we aimed to investigate whether the voltage-gated potassium channel KV1.3 regulates neutrophil function during the acute inflammatory process by affecting sustained Ca2+ signalling. METHODS AND RESULTS Using in vitro assays and electrophysiological techniques, we show that KV1.3 is functionally expressed in human neutrophils regulating sustained store-operated Ca2+ entry through membrane potential stabilizing K+ efflux. Inhibition of KV1.3 on neutrophils by the specific inhibitor 5-(4-Phenoxybutoxy)psoralen (PAP-1) impaired intracellular Ca2+ signalling, thereby preventing cellular spreading, adhesion strengthening, and appropriate crawling under flow conditions in vitro. Using intravital microscopy, we show that pharmacological blockade or genetic deletion of KV1.3 in mice decreased neutrophil adhesion in a blood flow dependent fashion in inflamed cremaster muscle venules. Furthermore, we identified KV1.3 as a critical component for neutrophil extravasation into the inflamed peritoneal cavity. Finally, we also revealed impaired phagocytosis of Escherichia coli particles by neutrophils in the absence of KV1.3. CONCLUSION We show that the voltage-gated potassium channel KV1.3 is critical for Ca2+ signalling and neutrophil trafficking during acute inflammatory processes. Our findings do not only provide evidence for a role of KV1.3 for sustained calcium signalling in neutrophils affecting key functions of these cells, they also open up new therapeutic approaches to treat inflammatory disorders characterized by overwhelming neutrophil infiltration.
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Affiliation(s)
- Roland Immler
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Wiebke Nadolni
- Walther-Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Goethestraße 33, 80336 Munich, Germany
| | - Annika Bertsch
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Vasilios Morikis
- Department of Biomedical Engineering, Graduate Group in Immunology, University of California, 451 E. Health Sciences Drive, Davis, CA 95616, USA
| | - Ina Rohwedder
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Sergi Masgrau-Alsina
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Tobias Schroll
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Anna Yevtushenko
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Oliver Soehnlein
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-Universität München, Pettenkofer Straße 8a, 80336 Munich, Germany
- Department of Physiology and Pharmacology (FyFa), Karolinska Institutet, Solnavägen 1, 17177 Stockholm, Sweden
- Institute for Experimental Pathology (ExPat), Center for Molecular Biology of Inflammation (ZMBE), Westfälische Wilhelms-Universität Münster, Von-Enmarch-Straße 56, 48149 Münster, Germany
| | - Markus Moser
- Institute of Experimental Hematology, School of Medicine, Technical University Munich, Einsteinstraße 25, 81675 Munich, Germany
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Goethestraße 33, 80336 Munich, Germany
| | - Eytan R Barnea
- BioIncept LLC, New York, 140 East 40th Street #11E, NY 10016, USA
| | - Markus Rehberg
- Institute of Lung Biology and Disease, Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Scott I Simon
- Department of Biomedical Engineering, Graduate Group in Immunology, University of California, 451 E. Health Sciences Drive, Davis, CA 95616, USA
| | - Susanna Zierler
- Walther-Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Goethestraße 33, 80336 Munich, Germany
| | - Monika Pruenster
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
| | - Markus Sperandio
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Großhaderner Straße 9, 82152 Planegg-Martinsried, Germany
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29
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Hermann C, Treder A, Näher M, Geiseler R, Gudermann T, Mederos Y Schnitzler M, Storch U. The normalized slope conductance as a tool for quantitative analysis of current-voltage relations. Biophys J 2022; 121:1435-1448. [PMID: 35300969 PMCID: PMC9072577 DOI: 10.1016/j.bpj.2022.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/02/2021] [Accepted: 03/11/2022] [Indexed: 11/29/2022] Open
Abstract
The patch-clamp method which was rewarded with the Nobel Prize in 1991 is a well-established and indispensable method to study ion channels in living cells and to biophysically characterize non-voltage-gated ion channels that comprise about 70% of all ion channels in the human genome. To investigate the biophysical properties of non-voltage-gated ion channels, whole-cell measurements with application of continuous voltage-ramps are routinely conducted to obtain current-voltage (IV) relationships. However, adequate tools for detailed and quantitative analysis of IV curves are still missing. We use the example of the transient receptor potential classical (TRPC) channel family to elucidate whether the normalized slope conductance (NSC) is an appropriate tool for a reliable discrimination of the IV curves of diverse TRPC channels that differ in their individual curve progression. We provide a robust calculation method for the NSC, and by applying this method we find that TRPC channel activators and modulators can evoke different NSC progressions independent from their expression levels which is pointing to distinguishable active channel states. TRPC6 mutations of patients suffering from focal segmental glomerulosclerosis (FSGS) resulted in distinct NSC progressions suggesting that the NSC is suitable to investigate structure-function relations and might help unravel the unknown pathomechanisms leading to FSGS. Altogether, the NCS represents an effective algorithm for extended biophysical characterization of non-voltage-gated ion channels.
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Affiliation(s)
- Christian Hermann
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany
| | - Aaron Treder
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany
| | - Marius Näher
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany
| | - Roman Geiseler
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany;; Comprehensive Pneumology Center Munich (CPC-M), German Center for Lung Research, Munich, Germany
| | - Michael Mederos Y Schnitzler
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany;; DZHK (German Centre for Cardiovascular Research), Munich Heart Alliance, Munich, Germany.
| | - Ursula Storch
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336 Munich, Germany;; Institute for Cardiovascular Prevention (IPEK), Ludwig Maximilian University of Munich, 80336 Munich, Germany.
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30
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Keshavarz M, Faraj Tabrizi S, Ruppert AL, Pfeil U, Schreiber Y, Klein J, Brandenburger I, Lochnit G, Bhushan S, Perniss A, Deckmann K, Hartmann P, Meiners M, Mermer P, Rafiq A, Winterberg S, Papadakis T, Thomas D, Angioni C, Oberwinkler J, Chubanov V, Gudermann T, Gärtner U, Offermanns S, Schütz B, Kummer W. Cysteinyl leukotrienes and acetylcholine are biliary tuft cell cotransmitters. Sci Immunol 2022; 7:eabf6734. [PMID: 35245090 DOI: 10.1126/sciimmunol.abf6734] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The gallbladder stores bile between meals and empties into the duodenum upon demand and is thereby exposed to the intestinal microbiome. This exposure raises the need for antimicrobial factors, among them, mucins produced by cholangiocytes, the dominant epithelial cell type in the gallbladder. The role of the much less frequent biliary tuft cells is still unknown. We here show that propionate, a major metabolite of intestinal bacteria, activates tuft cells via the short-chain free fatty acid receptor 2 and downstream signaling involving the cation channel transient receptor potential cation channel subfamily M member 5. This results in corelease of acetylcholine and cysteinyl leukotrienes from tuft cells and evokes synergistic paracrine effects upon the epithelium and the gallbladder smooth muscle, respectively. Acetylcholine triggers mucin release from cholangiocytes, an epithelial defense mechanism, through the muscarinic acetylcholine receptor M3. Cysteinyl leukotrienes cause gallbladder contraction through their cognate receptor CysLTR1, prompting emptying and closing. Our results establish gallbladder tuft cells as sensors of the microbial metabolite propionate, initiating dichotomous innate defense mechanisms through simultaneous release of acetylcholine and cysteinyl leukotrienes.
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Affiliation(s)
- Maryam Keshavarz
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Schayan Faraj Tabrizi
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Anna-Lena Ruppert
- Institute of Anatomy and Cell Biology, Philipps University, Marburg, Germany
| | - Uwe Pfeil
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Yannick Schreiber
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Project Group TMP, Frankfurt, Germany
| | - Jochen Klein
- Department of Pharmacology and Clinical Pharmacy, College of Pharmacy, Goethe University Frankfurt, Frankfurt, Germany
| | - Isabell Brandenburger
- Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany.,Department of Pharmacology, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Günter Lochnit
- Institute of Biochemistry, Justus Liebig University Giessen, Giessen, Germany
| | - Sudhanshu Bhushan
- Institute of Anatomy and Cell Biology, Unit of Reproductive Biology, Justus Liebig University Giessen, Giessen, Germany
| | - Alexander Perniss
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Klaus Deckmann
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Petra Hartmann
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Mirjam Meiners
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Petra Mermer
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Amir Rafiq
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Sarah Winterberg
- Institute of Anatomy and Cell Biology, Philipps University, Marburg, Germany
| | - Tamara Papadakis
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
| | - Dominique Thomas
- Pharmazentrum Frankfurt/ZAFES, Institute of Clinical Pharmacology, Goethe University Frankfurt, Frankfurt, Germany.,Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Frankfurt, Germany
| | - Carlo Angioni
- Pharmazentrum Frankfurt/ZAFES, Institute of Clinical Pharmacology, Goethe University Frankfurt, Frankfurt, Germany
| | - Johannes Oberwinkler
- Philipps-Universität Marburg, Institut für Physiologie und Pathophysiologie, Marburg, Germany
| | - Vladimir Chubanov
- Walther Straub Institute of Pharmacology and Toxicology, German Center for Lung Research, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, German Center for Lung Research, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Ulrich Gärtner
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany
| | - Stefan Offermanns
- Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany.,Department of Pharmacology, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Burkhard Schütz
- Institute of Anatomy and Cell Biology, Philipps University, Marburg, Germany
| | - Wolfgang Kummer
- Institute of Anatomy and Cell Biology, German Center for Lung Research, Justus Liebig University Giessen, Giessen, Germany.,Excellence Cluster Cardio-Pulmonary Institute, Justus Liebig University Giessen, Giessen, Germany
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31
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Spix B, Butz ES, Chen CC, Rosato AS, Tang R, Jeridi A, Kudrina V, Plesch E, Wartenberg P, Arlt E, Briukhovetska D, Ansari M, Günsel GG, Conlon TM, Wyatt A, Wetzel S, Teupser D, Holdt LM, Ectors F, Boekhoff I, Boehm U, García-Añoveros J, Saftig P, Giera M, Kobold S, Schiller HB, Zierler S, Gudermann T, Wahl-Schott C, Bracher F, Yildirim AÖ, Biel M, Grimm C. Lung emphysema and impaired macrophage elastase clearance in mucolipin 3 deficient mice. Nat Commun 2022; 13:318. [PMID: 35031603 PMCID: PMC8760276 DOI: 10.1038/s41467-021-27860-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 12/16/2021] [Indexed: 02/06/2023] Open
Abstract
Lung emphysema and chronic bronchitis are the two most common causes of chronic obstructive pulmonary disease. Excess macrophage elastase MMP-12, which is predominantly secreted from alveolar macrophages, is known to mediate the development of lung injury and emphysema. Here, we discovered the endolysosomal cation channel mucolipin 3 (TRPML3) as a regulator of MMP-12 reuptake from broncho-alveolar fluid, driving in two independently generated Trpml3-/- mouse models enlarged lung injury, which is further exacerbated after elastase or tobacco smoke treatment. Mechanistically, using a Trpml3IRES-Cre/eR26-τGFP reporter mouse model, transcriptomics, and endolysosomal patch-clamp experiments, we show that in the lung TRPML3 is almost exclusively expressed in alveolar macrophages, where its loss leads to defects in early endosomal trafficking and endocytosis of MMP-12. Our findings suggest that TRPML3 represents a key regulator of MMP-12 clearance by alveolar macrophages and may serve as therapeutic target for emphysema and chronic obstructive pulmonary disease.
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Affiliation(s)
- Barbara Spix
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Elisabeth S Butz
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany
- Institute for Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Cheng-Chang Chen
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany
- Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Anna Scotto Rosato
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Rachel Tang
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Aicha Jeridi
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Veronika Kudrina
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Eva Plesch
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany
| | - Philipp Wartenberg
- Saarland University, Center for Molecular Signaling (PZMS), Experimental Pharmacology, Homburg, Germany
| | - Elisabeth Arlt
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Daria Briukhovetska
- Division of Clinical Pharmacology, Department of Medicine IV, University Hospital Munich, Munich, Germany
| | - Meshal Ansari
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Gizem Günes Günsel
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Thomas M Conlon
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Amanda Wyatt
- Saarland University, Center for Molecular Signaling (PZMS), Experimental Pharmacology, Homburg, Germany
| | - Sandra Wetzel
- Institute of Biochemistry, Christian-Albrechts-University Kiel, Kiel, Germany
| | - Daniel Teupser
- Institute of Laboratory Medicine, University Hospital Munich, Munich, Germany
| | - Lesca M Holdt
- Institute of Laboratory Medicine, University Hospital Munich, Munich, Germany
| | - Fabien Ectors
- FARAH Mammalian Transgenics Platform, Liège University, Liège, Belgium
| | - Ingrid Boekhoff
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
| | - Ulrich Boehm
- Saarland University, Center for Molecular Signaling (PZMS), Experimental Pharmacology, Homburg, Germany
| | - Jaime García-Añoveros
- Departments of Anesthesiology, Physiology and Neurology, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA
| | - Paul Saftig
- Institute of Biochemistry, Christian-Albrechts-University Kiel, Kiel, Germany
| | - Martin Giera
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333ZA, Leiden, The Netherlands
| | - Sebastian Kobold
- Division of Clinical Pharmacology, Department of Medicine IV, University Hospital Munich, Munich, Germany
- German Center for Translational Cancer Research (DKTK), partner site Munich, Munich, Germany
| | - Herbert B Schiller
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Susanna Zierler
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
- Institute of Pharmacology, Johannes-Keppler-University, Linz, Australia
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany
- German Center of Lung Research (DZL), Munich, Germany
| | | | - Franz Bracher
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany
| | - Ali Önder Yildirim
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany.
| | - Martin Biel
- Department of Pharmacy, Ludwig-Maximilians-University, Munich, Germany.
| | - Christian Grimm
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany.
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Kollewe A, Chubanov V, Tseung FT, Correia L, Schmidt E, Rössig A, Zierler S, Haupt A, Müller CS, Bildl W, Schulte U, Nicke A, Fakler B, Gudermann T. The molecular appearance of native TRPM7 channel complexes identified by high-resolution proteomics. eLife 2021; 10:68544. [PMID: 34766907 PMCID: PMC8616561 DOI: 10.7554/elife.68544] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 11/08/2021] [Indexed: 12/22/2022] Open
Abstract
The transient receptor potential melastatin-subfamily member 7 (TRPM7) is a ubiquitously expressed membrane protein consisting of ion channel and protein kinase domains. TRPM7 plays a fundamental role in the cellular uptake of divalent cations such as Zn2+, Mg2+, and Ca2+, and thus shapes cellular excitability, plasticity, and metabolic activity. The molecular appearance and operation of TRPM7 channels in native tissues have remained unresolved. Here, we investigated the subunit composition of endogenous TRPM7 channels in rodent brain by multi-epitope affinity purification and high-resolution quantitative mass spectrometry (MS) analysis. We found that native TRPM7 channels are high-molecular-weight multi-protein complexes that contain the putative metal transporter proteins CNNM1-4 and a small G-protein ADP-ribosylation factor-like protein 15 (ARL15). Heterologous reconstitution experiments confirmed the formation of TRPM7/CNNM/ARL15 ternary complexes and indicated that complex formation effectively and specifically impacts TRPM7 activity. These results open up new avenues towards a mechanistic understanding of the cellular regulation and function of TRPM7 channels.
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Affiliation(s)
- Astrid Kollewe
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Fong Tsuen Tseung
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Leonor Correia
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Eva Schmidt
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Anna Rössig
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Susanna Zierler
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.,Institute of Pharmacology, Johannes Kepler University Linz, Linz, Austria
| | - Alexander Haupt
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Catrin Swantje Müller
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Wolfgang Bildl
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Uwe Schulte
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, Freiburg, Germany
| | - Annette Nicke
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany
| | - Bernd Fakler
- Institute of Physiology II, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, Freiburg, Germany
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.,German Center for Lung Research, Munich, Germany
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Schreyer L, Mittermeier C, Franz MJ, Meier MA, Martin DE, Maier KC, Huebner K, Schneider-Stock R, Singer S, Holzer K, Fischer D, Ribback S, Liebl B, Gudermann T, Aigner A, Muehlich S. Tetraspanin 5 (TSPAN5), a Novel Gatekeeper of the Tumor Suppressor DLC1 and Myocardin-Related Transcription Factors (MRTFs), Controls HCC Growth and Senescence. Cancers (Basel) 2021; 13:cancers13215373. [PMID: 34771537 PMCID: PMC8582588 DOI: 10.3390/cancers13215373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/10/2021] [Accepted: 10/12/2021] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Hepatocellular carcinoma (HCC) ranks second among the leading causes of cancer-related death. Since current therapeutic options are very limited, a deeper understanding of the molecular mechanisms underlying the tumor onset and progression of HCC holds great potential for improved therapeutic options. Although it has been shown that deleted in liver cancer 1 (DLC1) acts as a tumor suppressor whose allele is lost in 50% of liver cancers, alterations in gene expression initiated by DLC1 loss have not yet been the primary focus of liver cancer research. To identify novel gene targets that allow for a personalized medicine approach for HCC therapy, we performed gene expression profiling for HepG2 cells stably expressing DLC1shRNA. We provide evidence that TSPAN5 is required for HCC growth, migration and invasion, and dissected the underlying molecular mechanisms involving myocardin-related transcription factors. Thus, TSPAN5 represents a novel therapeutic target for the treatment of HCC characterized by DLC1 loss. Abstract Human hepatocellular carcinoma (HCC) is among the most lethal and common cancers in the human population, and new molecular targets for therapeutic intervention are urgently needed. Deleted in liver cancer 1 (DLC1) was originally identified as a tumor suppressor gene in human HCC. DLC1 is a Rho-GTPase-activating protein (RhoGAP) which accelerates the return of RhoGTPases to an inactive state. We recently described that the restoration of DLC1 expression induces cellular senescence. However, this principle is not amenable to direct therapeutic targeting. We therefore performed gene expression profiling for HepG2 cells depleted of DLC1 to identify druggable gene targets mediating the effects of DLC1 on senescence induction. This approach revealed that versican (VCAN), tetraspanin 5 (TSPAN5) and N-cadherin (CDH2) were strongly upregulated upon DLC1 depletion in HCC cells, but only TSPAN5 affected the proliferation of HCC cells and human HCC. The depletion of TSPAN5 induced oncogene-induced senescence (OIS), mediated by the p16INK4a/pRb pathways. Mechanistically, silencing TSPAN5 reduced actin polymerization and thereby myocardin-related transcription factor A- filamin A (MRTF-A-FLNA) complex formation, resulting in decreased expression of MRTF/SRF-dependent target genes and senescence induction in vitro and in vivo. Our results identify TSPAN5 as a novel druggable target for HCC.
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Affiliation(s)
- Laura Schreyer
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; (L.S.); (M.J.F.); (M.A.M.); (D.F.)
| | - Constanze Mittermeier
- Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore;
| | - Miriam J. Franz
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; (L.S.); (M.J.F.); (M.A.M.); (D.F.)
| | - Melanie A. Meier
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; (L.S.); (M.J.F.); (M.A.M.); (D.F.)
| | - Dietmar E. Martin
- Gene Center, Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, 81377 Munich, Germany; (D.E.M.); (K.C.M.)
| | - Kerstin C. Maier
- Gene Center, Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, 81377 Munich, Germany; (D.E.M.); (K.C.M.)
| | - Kerstin Huebner
- Experimental Tumor Pathology, Institute of Pathology, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany; (K.H.); (R.S.-S.)
| | - Regine Schneider-Stock
- Experimental Tumor Pathology, Institute of Pathology, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany; (K.H.); (R.S.-S.)
| | - Stephan Singer
- Department for Pathology, University Hospital Tuebingen, 72076 Tuebingen, Germany; (S.S.); (K.H.)
| | - Kerstin Holzer
- Department for Pathology, University Hospital Tuebingen, 72076 Tuebingen, Germany; (S.S.); (K.H.)
| | - Dagmar Fischer
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; (L.S.); (M.J.F.); (M.A.M.); (D.F.)
| | - Silvia Ribback
- Institute for Pathology, University of Greifswald, 17475 Greifswald, Germany;
| | - Bernhard Liebl
- LGL Bayerisches Landesamt für Gesundheit und Lebensmittelsicherheit, 85764 Oberschleißheim, Germany;
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-University Munich, 80336 Munich, Germany;
| | - Achim Aigner
- Rudolf Boehm Institute of Pharmacology and Toxicology, Clinical Pharmacology, University of Leipzig, 04107 Leipzig, Germany;
| | - Susanne Muehlich
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; (L.S.); (M.J.F.); (M.A.M.); (D.F.)
- Correspondence: ; Tel.: +49-(0)9131-8565665
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34
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Shimizu H, Huber S, Langenbacher AD, Crisman L, Huang J, Wang K, Wilting F, Gudermann T, Schredelseker J, Chen JN. Glutamate 73 Promotes Anti-arrhythmic Effects of Voltage-Dependent Anion Channel Through Regulation of Mitochondrial Ca 2+ Uptake. Front Physiol 2021; 12:724828. [PMID: 34483974 PMCID: PMC8416314 DOI: 10.3389/fphys.2021.724828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 07/22/2021] [Indexed: 12/27/2022] Open
Abstract
Mitochondria critically regulate a range of cellular processes including bioenergetics, cellular metabolism, apoptosis, and cellular Ca2+ signaling. The voltage-dependent anion channel (VDAC) functions as a passageway for the exchange of ions, including Ca2+, across the outer mitochondrial membrane. In cardiomyocytes, genetic or pharmacological activation of isoform 2 of VDAC (VDAC2) effectively potentiates mitochondrial Ca2+ uptake and suppresses Ca2+ overload-induced arrhythmogenic events. However, molecular mechanisms by which VDAC2 controls mitochondrial Ca2+ transport and thereby influences cardiac rhythmicity remain elusive. Vertebrates express three highly homologous VDAC isoforms. Here, we used the zebrafish tremblor/ncx1h mutant to dissect the isoform-specific roles of VDAC proteins in Ca2+ handling. We found that overexpression of VDAC1 or VDAC2, but not VDAC3, suppresses the fibrillation-like phenotype in zebrafish tremblor/ncx1h mutants. A chimeric approach showed that moieties in the N-terminal half of VDAC are responsible for their divergent functions in cardiac biology. Phylogenetic analysis further revealed that a glutamate at position 73, which was previously described to be an important regulator of VDAC function, is sevolutionarily conserved in VDAC1 and VDAC2, whereas a glutamine occupies position 73 (Q73) of VDAC3. To investigate whether E73/Q73 determines VDAC isoform-specific anti-arrhythmic effect, we mutated E73 to Q in VDAC2 (VDAC2E73Q) and Q73 to E in VDAC3 (VDAC3Q73E). Interestingly, VDAC2E73Q failed to restore rhythmic cardiac contractions in ncx1 deficient hearts, while the Q73E conversion induced a gain of function in VDAC3. In HL-1 cardiomyocytes, VDAC2 knockdown diminished the transfer of Ca2+ from the SR into mitochondria and overexpression of VDAC2 or VDAC3Q73E restored SR-mitochondrial Ca2+ transfer in VDAC2 deficient HL-1 cells, whereas this rescue effect was absent for VDAC3 and drastically compromised for VDAC2E73Q. Collectively, our findings demonstrate a critical role for the evolutionary conserved E73 in determining the anti-arrhythmic effect of VDAC isoforms through modulating Ca2+ cross-talk between the SR and mitochondria in cardiomyocytes.
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Affiliation(s)
- Hirohito Shimizu
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Simon Huber
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Adam D Langenbacher
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Lauren Crisman
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jie Huang
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Kevin Wang
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Fabiola Wilting
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany.,German Centre for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Johann Schredelseker
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany.,German Centre for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Jau-Nian Chen
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
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35
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Faro D, Boekhoff I, Gudermann T, Breit A. Physiological Temperature Changes Fine-Tune β 2- Adrenergic Receptor-Induced Cytosolic cAMP Accumulation. Mol Pharmacol 2021; 100:203-216. [PMID: 34158361 DOI: 10.1124/molpharm.121.000309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/04/2021] [Indexed: 11/22/2022] Open
Abstract
Norepinephrine (NE) controls many vital body functions by activating adrenergic receptors (ARs). Average core body temperature (CBT) in mice is 37°C. Of note, CBT fluctuates between 36 and 38°C within 24 hours, but little is known about the effects of CBT changes on the pharmacodynamics of NE. Here, we used Peltier element-controlled incubators and challenged murine hypothalamic mHypoA -2/10 cells with temperature changes of ±1°C. We observed enhanced NE-induced activation of a cAMP-dependent luciferase reporter at 36 compared with 38°C. mRNA analysis and subtype specific antagonists revealed that NE activates β 2- and β 3-AR in mHypoA-2/10 cells. Agonist binding to the β 2-AR was temperature insensitive, but measurements of cytosolic cAMP accumulation revealed an increase in efficacy of 45% ± 27% for NE and of 62% ± 33% for the β 2-AR-selective agonist salmeterol at 36°C. When monitoring NE-promoted cAMP efflux, we observed an increase in the absolute efflux at 36°C. However, the ratio of exported to cytosolic accumulated cAMP is higher at 38°C. We also stimulated cells with NE at 37°C and measured cAMP degradation at 36 and 38°C afterward. We observed increased cAMP degradation at 38°C, indicating enhanced phosphodiesterase activity at higher temperatures. In line with these data, NE-induced activation of the thyreoliberin promoter was found to be enhanced at 36°C. Overall, we show that physiologic temperature changes fine-tune NE-induced cAMP signaling in hypothalamic cells via β 2-AR by modulating cAMP degradation and the ratio of intra- and extracellular cAMP. SIGNIFICANCE STATEMENT: Increasing cytosolic cAMP levels by activation of G protein-coupled receptors (GPCR) such as the β 2-adrenergic receptor (AR) is essential for many body functions. Changes in core body temperature are fundamental and universal factors of mammalian life. This study provides the first data linking physiologically relevant temperature fluctuations to β 2-AR-induced cAMP signaling, highlighting a so far unappreciated role of body temperature as a modulator of the prototypic class A GPCR.
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MESH Headings
- 1-Methyl-3-isobutylxanthine/pharmacology
- ARNTL Transcription Factors/metabolism
- Aminopyridines/pharmacology
- Animals
- Cell Line
- Cyclic AMP/metabolism
- Cyclic AMP Response Element-Binding Protein/metabolism
- Cytosol/metabolism
- Forkhead Transcription Factors/metabolism
- GTP-Binding Protein alpha Subunits, Gq-G11/physiology
- GTP-Binding Protein alpha Subunits, Gs/physiology
- Hypothalamus/physiology
- Mice
- Neurons/physiology
- Norepinephrine/pharmacology
- Receptors, Adrenergic, beta-2/biosynthesis
- Receptors, Adrenergic, beta-2/physiology
- Receptors, Adrenergic, beta-3/biosynthesis
- Receptors, Adrenergic, beta-3/physiology
- STAT Transcription Factors/metabolism
- Salmeterol Xinafoate/pharmacology
- Signal Transduction/physiology
- Temperature
- Thyrotropin-Releasing Hormone/genetics
- Thyrotropin-Releasing Hormone/metabolism
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Affiliation(s)
- Dennis Faro
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, München, Germany
| | - Ingrid Boekhoff
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, München, Germany
| | - Thomas Gudermann
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, München, Germany
| | - Andreas Breit
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, München, Germany
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36
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Steinritz D, Lüling R, Siegert M, Mückter H, Popp T, Reinemer P, Gudermann T, Thiermann H, John H. Alkylation of rabbit muscle creatine kinase surface methionine residues inhibits enzyme activity in vitro. Arch Toxicol 2021; 95:3253-3261. [PMID: 34396457 PMCID: PMC8448711 DOI: 10.1007/s00204-021-03137-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/11/2021] [Indexed: 11/30/2022]
Abstract
Creatine kinase (CK) catalyzes the formation of phosphocreatine from adenosine triphosphate (ATP) and creatine. The highly reactive free cysteine residue in the active site of the enzyme (Cys283) is considered essential for the enzymatic activity. In previous studies we demonstrated that Cys283 is targeted by the alkylating chemical warfare agent sulfur mustard (SM) yielding a thioether with a hydroxyethylthioethyl (HETE)-moiety. In the present study, the effect of SM on rabbit muscle CK (rmCK) activity was investigated with special focus on the alkylation of Cys283 and of reactive methionine (Met) residues. For investigation of SM-alkylated amino acids in rmCK, micro liquid chromatography-electrospray ionization high-resolution tandem-mass spectrometry measurements were performed using the Orbitrap technology. The treatment of rmCK with SM resulted in a decrease of enzyme activity. However, this decrease did only weakly correlate to the modification of Cys283 but was conclusive for the formation of Met70-HETE and Met179-HETE. In contrast, the activity of mutants of rmCK produced by side-directed mutagenesis that contained substitutions of the respective Met residues (Met70Ala, Met179Leu, and Met70Ala/Met179Leu) was highly resistant against SM. Our results point to a critical role of the surface exposed Met70 and Met179 residues for CK activity.
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Affiliation(s)
- Dirk Steinritz
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany. .,Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität Munich (LMU), Goethestraße 33, 80366, Munich, Germany. .,Bundeswehr Medical Service Academy, Ingolstädter Straße 240, 80939, Munich, Germany.
| | - Robin Lüling
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany.,Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität Munich (LMU), Goethestraße 33, 80366, Munich, Germany
| | - Markus Siegert
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany.,Proteros Biostructures GmbH, Bunsenstraße 7a, 82152, Planegg, Germany
| | - Harald Mückter
- Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität Munich (LMU), Goethestraße 33, 80366, Munich, Germany
| | - Tanja Popp
- Bundeswehr Institute of Radiobiology, Neuherbergstraße 11, 80937, Munich, Germany
| | - Peter Reinemer
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany.,AM1 Ventures GmbH, Fasanenstraße 27a, 81247, Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität Munich (LMU), Goethestraße 33, 80366, Munich, Germany
| | - Horst Thiermann
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany
| | - Harald John
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstraße 11, 80937, Munich, Germany
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Shankar TS, Ramadurai DKA, Steinhorst K, Sommakia S, Badolia R, Thodou Krokidi A, Calder D, Navankasattusas S, Sander P, Kwon OS, Aravamudhan A, Ling J, Dendorfer A, Xie C, Kwon O, Cheng EHY, Whitehead KJ, Gudermann T, Richardson RS, Sachse FB, Schredelseker J, Spitzer KW, Chaudhuri D, Drakos SG. Cardiac-specific deletion of voltage dependent anion channel 2 leads to dilated cardiomyopathy by altering calcium homeostasis. Nat Commun 2021; 12:4583. [PMID: 34321484 PMCID: PMC8319341 DOI: 10.1038/s41467-021-24869-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/06/2021] [Indexed: 12/13/2022] Open
Abstract
Voltage dependent anion channel 2 (VDAC2) is an outer mitochondrial membrane porin known to play a significant role in apoptosis and calcium signaling. Abnormalities in calcium homeostasis often leads to electrical and contractile dysfunction and can cause dilated cardiomyopathy and heart failure. However, the specific role of VDAC2 in intracellular calcium dynamics and cardiac function is not well understood. To elucidate the role of VDAC2 in calcium homeostasis, we generated a cardiac ventricular myocyte-specific developmental deletion of Vdac2 in mice. Our results indicate that loss of VDAC2 in the myocardium causes severe impairment in excitation-contraction coupling by altering both intracellular and mitochondrial calcium signaling. We also observed adverse cardiac remodeling which progressed to severe cardiomyopathy and death. Reintroduction of VDAC2 in 6-week-old knock-out mice partially rescued the cardiomyopathy phenotype. Activation of VDAC2 by efsevin increased cardiac contractile force in a mouse model of pressure-overload induced heart failure. In conclusion, our findings demonstrate that VDAC2 plays a crucial role in cardiac function by influencing cellular calcium signaling. Through this unique role in cellular calcium dynamics and excitation-contraction coupling VDAC2 emerges as a plausible therapeutic target for heart failure.
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Affiliation(s)
- Thirupura S. Shankar
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Department of Biomedical Engineering, University of Utah, Salt Lake City, UT USA
| | - Dinesh K. A. Ramadurai
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Kira Steinhorst
- grid.5252.00000 0004 1936 973XWalther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Salah Sommakia
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Rachit Badolia
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Aspasia Thodou Krokidi
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Dallen Calder
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Sutip Navankasattusas
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Paulina Sander
- grid.5252.00000 0004 1936 973XWalther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Oh Sung Kwon
- grid.63054.340000 0001 0860 4915Department of Kinesiology, University of Connecticut, Storrs, CT USA ,grid.413886.0Geriatric Research, Education, and Clinical Center, Salt Lake City VA Medical Center, Salt Lake City, UT USA
| | - Aishwarya Aravamudhan
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Jing Ling
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA
| | - Andreas Dendorfer
- grid.5252.00000 0004 1936 973XWalter-Brendel-Center of Experimental Medicine, Ludwig-Maximilians Universität Munich, Munich, Germany ,grid.452396.f0000 0004 5937 5237German Centre for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Changmin Xie
- grid.19006.3e0000 0000 9632 6718Department of Chemistry and Biochemistry, University of California, Los Angeles, CA USA
| | - Ohyun Kwon
- grid.19006.3e0000 0000 9632 6718Department of Chemistry and Biochemistry, University of California, Los Angeles, CA USA
| | - Emily H. Y. Cheng
- grid.51462.340000 0001 2171 9952Memorial Sloan Kettering Cancer Center, New York, NY USA
| | - Kevin J. Whitehead
- grid.223827.e0000 0001 2193 0096Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City, UT USA
| | - Thomas Gudermann
- grid.5252.00000 0004 1936 973XWalther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany ,grid.452396.f0000 0004 5937 5237German Centre for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Russel S. Richardson
- grid.413886.0Geriatric Research, Education, and Clinical Center, Salt Lake City VA Medical Center, Salt Lake City, UT USA
| | - Frank B. Sachse
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Department of Biomedical Engineering, University of Utah, Salt Lake City, UT USA
| | - Johann Schredelseker
- grid.5252.00000 0004 1936 973XWalther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany ,grid.452396.f0000 0004 5937 5237German Centre for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Kenneth W. Spitzer
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City, UT USA
| | - Dipayan Chaudhuri
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City, UT USA
| | - Stavros G. Drakos
- grid.223827.e0000 0001 2193 0096Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Department of Biomedical Engineering, University of Utah, Salt Lake City, UT USA ,grid.223827.e0000 0001 2193 0096Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City, UT USA
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Sander P, Feng M, Schweitzer MK, Wilting F, Gutenthaler SM, Arduino DM, Fischbach S, Dreizehnter L, Moretti A, Gudermann T, Perocchi F, Schredelseker J. Approved drugs ezetimibe and disulfiram enhance mitochondrial Ca 2+ uptake and suppress cardiac arrhythmogenesis. Br J Pharmacol 2021; 178:4518-4532. [PMID: 34287836 DOI: 10.1111/bph.15630] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 06/21/2021] [Accepted: 06/30/2021] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND AND PURPOSE Treatment of cardiac arrhythmia remains challenging due to severe side effects of common anti-arrhythmic drugs. We previously demonstrated that mitochondrial Ca2+ uptake in cardiomyocytes represents a promising new candidate structure for safer drug therapy. However, druggable agonists of mitochondrial Ca2+ uptake suitable for preclinical and clinical studies are still missing. EXPERIMENTAL APPROACH Herewe screened 727 compounds with a history of use in human clinical trials in a three-step screening approach. As a primary screening platform we used a permeabilized HeLa cell-based mitochondrial Ca2+ uptake assay. Hits were validated in cultured HL-1 cardiomyocytes and finally tested for anti-arrhythmic efficacy in three translational models: a Ca2+ overload zebrafish model and cardiomyocytes of both a mouse model for catecholaminergic polymorphic ventricular tachycardia (CPVT) and induced pluripotent stem cell derived cardiomyocytes from a CPVT patient. KEY RESULTS We identifiedtwo candidate compounds, the clinically approved drugs ezetimibe and disulfiram, which stimulate SR-mitochondria Ca2+ transfer at nanomolar concentrations. This is significantly lower compared to the previously described mitochondrial Ca2+ uptake enhancers (MiCUps) efsevin, a gating modifier of the voltage-dependent anion channel 2, and kaempferol, an agonist of the mitochondrial Ca2+ uniporter. Both substances restored rhythmic cardiac contractions in a zebrafish cardiac arrhythmia model and significantly suppressed arrhythmogenesis in freshly isolated ventricular cardiomyocytes from a CPVT mouse model as well as induced pluripotent stem cell derived cardiomyocytes from a CPVT patient. CONCLUSION AND IMPLICATIONS Taken together we identified ezetimibe and disulfiram as novel MiCUps and efficient suppressors of arrhythmogenesis and as such as, promising candidates for future preclinical and clinical studies.
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Affiliation(s)
- Paulina Sander
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Michael Feng
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, Neuherberg, Germany
| | - Maria K Schweitzer
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Fabiola Wilting
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Sophie M Gutenthaler
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Daniela M Arduino
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, Neuherberg, Germany
| | - Sandra Fischbach
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany
| | - Lisa Dreizehnter
- I. Department of Medicine, Cardiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Alessandra Moretti
- I. Department of Medicine, Cardiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.,Partner Site Munich Heart Alliance (MHA), Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK), Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany.,Partner Site Munich Heart Alliance (MHA), Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK), Munich, Germany
| | - Fabiana Perocchi
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, Neuherberg, Germany.,Munich Cluster for Systems Neurology, Munich, Germany
| | - Johann Schredelseker
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, Munich, Germany.,Partner Site Munich Heart Alliance (MHA), Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK), Munich, Germany
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Braun A, Anders HJ, Gudermann T, Mammadova-Bach E. Platelet-Cancer Interplay: Molecular Mechanisms and New Therapeutic Avenues. Front Oncol 2021; 11:665534. [PMID: 34322381 PMCID: PMC8311658 DOI: 10.3389/fonc.2021.665534] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 06/17/2021] [Indexed: 12/18/2022] Open
Abstract
Although platelets are critically involved in thrombosis and hemostasis, experimental and clinical evidence indicate that platelets promote tumor progression and metastasis through a wide range of physical and functional interactions between platelets and cancer cells. Thrombotic and thromboembolic events are frequent complications in patients with solid tumors. Hence, cancer modulates platelet function by directly inducing platelet-tumor aggregates and triggering platelet granule release and altering platelet turnover. Also, platelets enhance tumor cell dissemination by activating endothelial cell function and recruiting immune cells to primary and metastatic tumor sites. In this review, we summarize current knowledge on the complex interactions between platelets and tumor cells and the host microenvironment. We also critically discuss the potential of anti-platelet agents for cancer prevention and treatment.
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Affiliation(s)
- Attila Braun
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Hans-Joachim Anders
- Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
| | - Thomas Gudermann
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Elmina Mammadova-Bach
- Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, Member of the German Center for Lung Research (DZL), Munich, Germany.,Division of Nephrology, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Munich, Germany
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Inwald EC, Albring C, Baum E, Beckermann M, Bühling KJ, Emons G, Gudermann T, Hadji P, Imthurn B, Kiesel L, Klemperer D, Klose P, König K, Krüger S, Langhorst J, Leitzmann M, Ludolph A, Lüftner D, Müller D, Neulen J, Nothacker M, Prautzsch H, Regitz-Zagrosek V, Schaudig K, Schütz F, Schwenkhagen A, Strowitzki T, Stute P, Taute BM, Tempfer C, Arnim CV, Wildt L, Windler E, Ortmann O. Perimenopause and Postmenopause - Diagnosis and Interventions. Guideline of the DGGG and OEGGG (S3-Level, AWMF Registry Number 015-062, September 2020). Geburtshilfe Frauenheilkd 2021; 81:612-636. [PMID: 34168377 DOI: 10.1055/a-1361-1948] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 10/21/2022] Open
Abstract
Aim The aim of the interdisciplinary S3-guideline Perimenopause and Postmenopause - Diagnosis and Interventions is to provide help to physicians as they inform women about the physiological changes which occur at this stage of life and the treatment options. The guideline should serve as a basis for decisions taken during routine medical care. This short version lists the statements and recommendations given in the long version of the guideline together with the evidence levels, the level of recommendation, and the strength of consensus. Methods The statements and recommendations are largely based on methodologically high-quality publications. The literature was evaluated by experts and mandate holders using evidence-based medicine (EbM) criteria. The search for evidence was carried out by the Essen Research Institute for Medical Management (EsFoMed). To some extent, this guideline also draws on an evaluation of the evidence used in the NICE guideline on Menopause and the S3-guidelines of the AWMF and has adapted parts of these guidelines. Recommendations Recommendations are given for the following subjects: diagnosis and therapeutic interventions for perimenopausal and postmenopausal women, urogynecology, cardiovascular disease, osteoporosis, dementia, depression, mood swings, hormone therapy and cancer risk, as well as primary ovarian insufficiency.
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Affiliation(s)
- Elisabeth C Inwald
- Klinik für Frauenheilkunde und Geburtshilfe, Lehrstuhl der Universität Regensburg, Caritas-Krankenhaus St. Josef, Regensburg, Germany; Leitlinienkoordinator(in)
| | - Christian Albring
- Frauenarzt, Präsident des Berufsverbandes der Frauenärzte e. V., Frauenärzte im Netz, Hannover, Germany
| | - Erika Baum
- Abteilung für Allgemeinmedizin, Präventive und Rehabilitative Medizin, Philipps Universität Marburg, Marburg, Germany
| | - Maria Beckermann
- Frauenärztin, delegiert von der Deutschen Gesellschaft für Psychosomatische Frauenheilkunde und Geburtshilfe (DGPFG) e. V., Köln, Germany
| | - Kai J Bühling
- Leiter der Hormonsprechstunde, Klinik und Poliklinik für Gynäkologie, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Günter Emons
- Klinik für Gynäkologie und Geburtshilfe, Universitätsmedizin Göttingen, Göttingen, Germany
| | - Thomas Gudermann
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Ludwig-Maximilians-Universität München, München, Germany
| | - Peyman Hadji
- Frankfurter Hormon und Osteoporosezentrum, Frankfurt am Main; Phillips-Universität Marburg, Marburg, Germany
| | - Bruno Imthurn
- Universitätsspital Zürich, Klinik für Reproduktions-Endokrinologie, Zürich, Switzerland
| | - Ludwig Kiesel
- Universitätsklinikum Münster, Klinik für Frauenheilkunde und Geburtshilfe, Direktor, Münster, Germany
| | - David Klemperer
- Ostbayerische Technische Hochschule Regensburg, Fakultät Angewandte Sozial- und Gesundheitswissenschaften, Regensburg, Germany
| | - Petra Klose
- Kliniken Essen-Mitte, Knappschafts-Krankenhaus, Klinik für Naturheilkunde und Integrative Medizin, Essen, Germany
| | - Klaus König
- Stimmberechtigter Vertreter des Berufsverbandes der Frauenärzte, Eschborn, Germany
| | - Stephanie Krüger
- Department für seelische Gesundheit, Vivantes Klinikum Spandau, Berlin, Germany
| | - Jost Langhorst
- Stiftungslehrstuhl für Integrative Medizin der Universität Duisburg-Essen, Chefarzt, Klinik für Integrative Medizin und Naturheilkunde, Sozialstiftung Bamberg, Klinikum am Bruderwald, Bamberg, Germany
| | - Michael Leitzmann
- Universitätsklinikum Regensburg, Fakultät für Medizin, Institut für Epidemiologie und Präventivmedizin, Regensburg, Germany
| | - Albert Ludolph
- Universitätsklinikum Ulm, Klinik für Neurologie, Ulm, Germany
| | - Diana Lüftner
- Klinik für Hämatologie, Onkologie und Tumorimmunologie, Charité - Universitätsmedizin, Berlin, Germany
| | | | - Joseph Neulen
- Uniklinik RWTH Aachen, Klinik für Gynäkologische Endokrinologie und Reproduktionsmedizin, Aachen, Germany
| | - Monika Nothacker
- Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften (AWMF), Berlin, Germany
| | | | - Horst Prautzsch
- Überörtliche Gemeinschaftspraxis, Facharzt für Allgemeinmedizin, Akademische Lehrpraxis der Universität Tübingen, Tübingen, Germany
| | - Vera Regitz-Zagrosek
- Charité - Universitätsmedizin Berlin, Institut für Geschlechterforschung in der Medizin, Gender in Medicine (GiM), Berlin, Germany
| | - Kathrin Schaudig
- Hormone Hamburg, Praxis für gynäkologische Endokrinologie, Hamburg, Germany
| | - Florian Schütz
- Klinik für Gynäkologie und Geburtshilfe am Diakonissen-Stiftungskrankenhaus Speyer, Speyer, Germany
| | | | - Thomas Strowitzki
- Abteilung für Gynäkologische Endokrinologie und Fertilitätsstörungen, Frauenklinik, Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - Petra Stute
- Universitätsklinik für Frauenheilkunde, Inselspital Bern, Bern, Switzerland
| | - Bettina-Maria Taute
- Universitätsklinikum Halle, Schwerpunktbereich Angiologie der Klinik für Innere Medizin III, Halle, Germany
| | - Clemens Tempfer
- Frauenklinik der Ruhr Universität Bochum, Marienhospital Herne, Bochum/Herne, Germany
| | - Christine V Arnim
- Abteilung und Lehrstuhl für Geriatrie, Universitätsmedizin Göttingen, Göttingen, Germany
| | - Ludwig Wildt
- Em Direktor der Universitätsklinik für Gynäkologische Endokrinologie und Reproduktionsmedizin, Vorsitzender der Ethikkommission, Medizinische Universität Innsbruck, Innsbruck, Austria
| | - Eberhard Windler
- Institut für Versorgungsforschung in der Dermatologie und bei Pflegeberufen (IVDP), Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Olaf Ortmann
- Klinik für Frauenheilkunde und Geburtshilfe, Lehrstuhl der Universität Regensburg, Caritas-Krankenhaus St. Josef, Regensburg, Germany; Leitlinienkoordinator(in)
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Yang L, Mammadova-Bach E, Braun A, Gudermann T, Anders HJ, Steiger S. FC 003HYPERURICEMIA HAS VASOACTIVE EFFECTS IN CHOLESTEROL CRYSTAL-INDUCED ACUTE KIDNEY INJURY. Nephrol Dial Transplant 2021. [DOI: 10.1093/ndt/gfab142.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background and Aims
Numerous observational studies have reported an association between hyperuricemia (HU) and cardiovascular disease where atherosclerosis is a leading cause. In advanced atherosclerosis, cholesterol crystal (CC) embolism is a life-threatening complication with an average mortality of 62.8%. Clinical manifestations include skin necrosis, intestinal injury and acute kidney injury (AKI). Autopsies and tissue biopsies reveal CC inside the arterial lumen. In a new model of CC-induced AKI, we recently found that fibrin clots formed around CC obstruct peripheral arteries and cause tissue infarction and organ failure. However, the role of asymptomatic HU in CC-induced AKI is currently unknown. Thus, we hypothesized that asymptomatic HU improves the outcomes after CC-induced AKI.
Method
In vivo, 6 weeks old Alb-creERT2;Glut9lox/lox and Glut9lox/lox control mice were intraperitoneally injected with tamoxifen to deplete hepatic Glut9 expression. Both groups of mice were placed on a standard chow diet enriched with inosine for two weeks. Afterward, a solution of CCs was injected into the left kidney arteries of mice to induce AKI. Serum and kidneys were collected 24 hours later, and kidney function, infarct size and kidney injury evaluated using GFR measurement, colorimetric assays, ELISA and immunohistochemistry of kidney sections. For in vitro studies, we isolated platelets from healthy mice and cultured them in the presence or absence of soluble uric acid (sUA) prior to CC activation. After stimulation, platelet aggregation assays and flow cytometry were performed.
Results
Our in vivo data showed that Alb-creERT2;Glut9lox/lox mice developed asymptomatic HU without kidney impairment (serum UA levels 9-15 mg/dL), while Glut9lox/lox control mice remained healthy. HU mice displayed a rapid decline in GFR of approx. 80% as compared to only 30% in healthy mice after CC-induced AKI, which was in line with increased serum BUN and IL-6 levels. The rapid GFR decline was due to vasoconstriction in arteries of the contralateral kidney as determined by αSMA/fibrin staining and a reduced ratio of lumen versus artery area in mice with HU after AKI. HU mice also had significantly less kidney infarct size as well as reduced kidney injury (necrosis and edema) and arterial occlusion. The in vitro data showed that sUA had no impact on platelet aggregation, activation and degranulation as compared to medium control in response to CCs.
Conclusion
We now show that HU has vasoconstrictive effects in the contralateral kidney by reducing GFR, while at the same time protects mice from CC-induced AKI suggesting a compensatory physiological mechanism of autoregulation to protect nephrons. On the other hand, in patients with chronic kidney disease, HU-related vasoconstriction might lead to increased arterial blood pressure; thus, increasing the risk for cardiovascular complications due to platelet activation and aggregation.
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Affiliation(s)
- Luying Yang
- Hospital of the Ludwig Maximilian University of Munich, Division of Nephrology, Department of Medicine IV, Munich, Germany
| | - Elmina Mammadova-Bach
- Hospital of the Ludwig Maximilian University of Munich, Division of Nephrology, Department of Medicine IV, Munich, Germany
| | - Attila Braun
- Ludwig Maximilian University of Munich, Walther-Straub-Institute for Pharmacology and Toxicology, Munich, Germany
| | - Thomas Gudermann
- Ludwig Maximilian University of Munich, Walther-Straub-Institute for Pharmacology and Toxicology, Munich, Germany
| | - Hans-Joachim Anders
- Hospital of the Ludwig Maximilian University of Munich, Division of Nephrology, Department of Medicine IV, Munich, Germany
| | - Stefanie Steiger
- Hospital of the Ludwig Maximilian University of Munich, Division of Nephrology, Department of Medicine IV, Munich, Germany
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Leinders-Zufall T, Storch U, Mederos y Schnitzler M, Ojha NK, Koike K, Gudermann T, Zufall F. A diacylglycerol photoswitching protocol for studying TRPC channel functions in mammalian cells and tissue slices. STAR Protoc 2021; 2:100527. [PMID: 34027485 PMCID: PMC8121987 DOI: 10.1016/j.xpro.2021.100527] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Small molecular probes designed for photopharmacology and opto-chemogenetics are rapidly gaining widespread recognition for investigations of transient receptor potential canonical (TRPC) channels. This protocol describes the use of three photoswitchable diacylglycerol analogs—PhoDAG-1, PhoDAG-3, and OptoDArG—for ultrarapid activation and deactivation of native TRPC2 channels in mouse vomeronasal sensory neurons and olfactory type B cells, as well as heterologously expressed human TRPC6 channels. Photoconversion can be achieved in mammalian tissue slices and enables all-optical stimulation and shutoff of TRPC channels. For complete details on the use and execution of this protocol, please refer to Leinders-Zufall et al. (2018). DAG photoswitching enables ultrarapid activation and deactivation of TRPC channels Multiple photoswitchable DAG analogs are now available DAG photoconversion is sufficient for the gating of TRPC2, TRPC3, and TRPC6 Photoswitching combined with Ca2+ imaging enables all-optical stimulation and recording
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Affiliation(s)
- Trese Leinders-Zufall
- Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Ursula Storch
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, 80336 München, Germany
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-Universität München, 80336 München, Germany
| | - Michael Mederos y Schnitzler
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, 80336 München, Germany
| | - Navin K. Ojha
- Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Kohei Koike
- Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Thomas Gudermann
- Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, 80336 München, Germany
| | - Frank Zufall
- Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
- Corresponding author
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Geiger F, Staab‐Weijnitz C, Gudermann T, Dietrich A. TRPA1 function in human pulmonary fibroblasts. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.03394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fabienne Geiger
- Walther‐Straub‐Institute of Pharmacology and ToxicologyLMU‐MunichMunich
| | | | - Thomas Gudermann
- Walther‐Straub‐Institute of Pharmacology and ToxicologyLMU‐MunichMunich
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Rios F, Zou Z, Neves K, Camargo L, Lopes R, Chubanov V, Gudermann T, Montezano A, Touyz R. TRPM7 is protective against hypertension, cardiovascular inflammation and fibrosis induced by aldosterone and salt. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.02706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - ZhiGuo Zou
- BHF‐ICAMS ‐ University of GlasgowGlasgow
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Storch U, Mederos Y Schnitzler M, Gudermann T. A greasy business: Identification of a diacylglycerol binding site in human TRPC5 channels by cryo-EM. Cell Calcium 2021; 97:102414. [PMID: 33930818 DOI: 10.1016/j.ceca.2021.102414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 11/22/2022]
Abstract
The transient receptor potential classical or canonical (TRPC) 5 channel is a non-selective calcium-permeable cation channel that recently emerged as a promising target for the treatment of various diseases such as mental disorders and kidney diseases. Thus, detailed insight into the structural properties of TRPC5 channels is of utmost importance to further advance TRPC5 channels as drug targets. Recently, Song et al. (2021) have presented cryo-EM structures of the human TRPC5 channel alone or in complex with two different inhibitors thereby revealing two new distinct drug binding sites. Moreover, a binding site for the second messenger diacylglycerol (DAG) has been identified commensurate with a key role of DAG for TRPC5 channel activation.
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Affiliation(s)
- Ursula Storch
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336, Munich, Germany; Institute for Cardiovascular Prevention (IPEK), Ludwig Maximilian University of Munich, 80336, Munich, Germany
| | - Michael Mederos Y Schnitzler
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336, Munich, Germany; DZHK (German Centre for Cardiovascular Research), Munich Heart Alliance, Munich, Germany.
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig Maximilian University of Munich, 80336, Munich, Germany; German Center for Lung Research, Munich, Germany.
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Schneider H, Fruehbuss L, Sun J, Meng Y, Marques JG, Koletzko B, Schnitzler MMY, Gudermann T, Beuschlein F, Williams TA, Reincke M. GLUCO- AND MINERALOCORTICOIDS SYNERGISTICALLY DOWNREGULATE BKCA CHANNEL TRANSCRIPTION IN VASCULAR SMOOTH MUSCLE CELLS BUT DO NOT AFFECT THE EPOXYEICOSATRIENOIC ACID PATHWAY. J Hypertens 2021. [DOI: 10.1097/01.hjh.0000745004.12521.4a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nadolni W, Immler R, Hoelting K, Fraticelli M, Ripphahn M, Rothmiller S, Matsushita M, Boekhoff I, Gudermann T, Sperandio M, Zierler S. TRPM7 Kinase Is Essential for Neutrophil Recruitment and Function via Regulation of Akt/mTOR Signaling. Front Immunol 2021; 11:606893. [PMID: 33658993 PMCID: PMC7917126 DOI: 10.3389/fimmu.2020.606893] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 12/22/2020] [Indexed: 12/22/2022] Open
Abstract
During inflammation, neutrophils are one of the first responding cells of innate immunity, contributing to a fast clearance of infection and return to homeostasis. However, excessive neutrophil infiltration accelerates unsolicited disproportionate inflammation for instance in autoimmune diseases such as rheumatoid arthritis. The transient-receptor-potential channel-kinase TRPM7 is an essential regulator of immune system homeostasis. Naïve murine T cells with genetic inactivation of the TRPM7 enzyme, due to a point mutation at the active site, are unable to differentiate into pro-inflammatory T cells, whereas regulatory T cells develop normally. Moreover, TRPM7 is vital for lipopolysaccharides (LPS)-induced activation of murine macrophages. Within this study, we show that the channel-kinase TRPM7 is functionally expressed in neutrophils and has an important impact on neutrophil recruitment during inflammation. We find that human neutrophils cannot transmigrate along a CXCL8 chemokine gradient or produce reactive oxygen species in response to gram-negative bacterial lipopolysaccharide LPS, if TRPM7 channel or kinase activity are blocked. Using a recently identified TRPM7 kinase inhibitor, TG100-115, as well as murine neutrophils with genetic ablation of the kinase activity, we confirm the importance of both TRPM7 channel and kinase function in murine neutrophil transmigration and unravel that TRPM7 kinase affects Akt1/mTOR signaling thereby regulating neutrophil transmigration and effector function. Hence, TRPM7 represents an interesting potential target to treat unwanted excessive neutrophil invasion.
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Affiliation(s)
- Wiebke Nadolni
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Roland Immler
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Kilian Hoelting
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Marco Fraticelli
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Myriam Ripphahn
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Simone Rothmiller
- Bundeswehr Institute of Pharmacology and Toxicology, Munich, Germany
| | - Masayuki Matsushita
- Department of Molecular and Cellular Physiology, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Ingrid Boekhoff
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Markus Sperandio
- Walter Brendel Centre of Experimental Medicine, Biomedical Center, Institute of Cardiovascular Physiology and Pathophysiology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Susanna Zierler
- Walther Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, Munich, Germany.,Institute of Pharmacology, Johannes Kepler University Linz, Linz, Austria
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Sander P, Gudermann T, Schredelseker J. A Calcium Guard in the Outer Membrane: Is VDAC a Regulated Gatekeeper of Mitochondrial Calcium Uptake? Int J Mol Sci 2021; 22:ijms22020946. [PMID: 33477936 PMCID: PMC7833399 DOI: 10.3390/ijms22020946] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/12/2021] [Accepted: 01/14/2021] [Indexed: 12/15/2022] Open
Abstract
Already in the early 1960s, researchers noted the potential of mitochondria to take up large amounts of Ca2+. However, the physiological role and the molecular identity of the mitochondrial Ca2+ uptake mechanisms remained elusive for a long time. The identification of the individual components of the mitochondrial calcium uniporter complex (MCUC) in the inner mitochondrial membrane in 2011 started a new era of research on mitochondrial Ca2+ uptake. Today, many studies investigate mitochondrial Ca2+ uptake with a strong focus on function, regulation, and localization of the MCUC. However, on its way into mitochondria Ca2+ has to pass two membranes, and the first barrier before even reaching the MCUC is the outer mitochondrial membrane (OMM). The common opinion is that the OMM is freely permeable to Ca2+. This idea is supported by the presence of a high density of voltage-dependent anion channels (VDACs) in the OMM, forming large Ca2+ permeable pores. However, several reports challenge this idea and describe VDAC as a regulated Ca2+ channel. In line with this idea is the notion that its Ca2+ selectivity depends on the open state of the channel, and its gating behavior can be modified by interaction with partner proteins, metabolites, or small synthetic molecules. Furthermore, mitochondrial Ca2+ uptake is controlled by the localization of VDAC through scaffolding proteins, which anchor VDAC to ER/SR calcium release channels. This review will discuss the possibility that VDAC serves as a physiological regulator of mitochondrial Ca2+ uptake in the OMM.
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Affiliation(s)
- Paulina Sander
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany; (P.S.); (T.G.)
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany; (P.S.); (T.G.)
- Deutsches Zentrum für Herz-Kreislauf-Forschung, Partner Site Munich Heart Alliance, Munich, Germany
| | - Johann Schredelseker
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, LMU Munich, 80336 Munich, Germany; (P.S.); (T.G.)
- Deutsches Zentrum für Herz-Kreislauf-Forschung, Partner Site Munich Heart Alliance, Munich, Germany
- Correspondence: ; Tel.: +49-(0)89-2180-73831
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Chubanov V, Gudermann T. Lactate as a new second messenger shaping intracellular Mg 2+ dynamics and bioenergetics. Cell Calcium 2020; 93:102329. [PMID: 33340852 DOI: 10.1016/j.ceca.2020.102329] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/04/2020] [Accepted: 12/04/2020] [Indexed: 10/22/2022]
Abstract
Mg2+ is an essential cation controlling many biochemical reactions. Recently, Daw et al. [1] have shown that l-lactate acts as a second messenger triggering a dynamic exchange of Mg2+ between the endoplasmic reticulum and mitochondria to shape energy metabolism. This discovery changes our view on the cellular role of Mg2+.
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Affiliation(s)
- Vladimir Chubanov
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Germany.
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, LMU Munich, Germany; German Center for Lung Research, Munich, Germany.
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Weber J, Rajan S, Schremmer C, Chao YK, Krasteva-Christ G, Kannler M, Yildirim AÖ, Brosien M, Schredelseker J, Weissmann N, Grimm C, Gudermann T, Dietrich A. TRPV4 channels are essential for alveolar epithelial barrier function as protection from lung edema. JCI Insight 2020; 5:134464. [PMID: 32931478 PMCID: PMC7605532 DOI: 10.1172/jci.insight.134464] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 09/09/2020] [Indexed: 12/25/2022] Open
Abstract
Ischemia/reperfusion-induced edema (IRE), one of the most significant causes of mortality after lung transplantation, can be mimicked ex vivo in isolated perfused mouse lungs (IPL). Transient receptor potential vanilloid 4 (TRPV4) is a nonselective cation channel studied in endothelium; however, its role in the lung epithelium remains elusive. Here, we show enhanced IRE in TRPV4-deficient (TRPV4–/–) IPL compared with that of WT controls, indicating a protective role of TRPV4 in maintenance of the alveolar epithelial barrier. By immunohistochemistry, mRNA profiling, and electrophysiological characterization, we detected TRPV4 in bronchial epithelium, alveolar epithelial type I (ATI), and alveolar epithelial type II (ATII) cells. Genetic ablation of TRPV4 resulted in reduced expression of the water-conducting aquaporin-5 (AQP-5) channel in ATI cells. Migration of TRPV4–/– ATI cells was reduced, and cell barrier function was impaired. Analysis of isolated primary TRPV4–/– ATII cells revealed a reduced expression of surfactant protein C, and the TRPV4 activator GSK1016790A induced increases in current densities only in WT ATII cells. Moreover, TRPV4–/– lungs of adult mice developed significantly larger mean chord lengths and altered lung function compared with WT lungs. Therefore, our data illustrate essential functions of TRPV4 channels in alveolar epithelial cells and in protection from edema formation. TRPV4, a non-selective cation channel, is essential for alveolar epithelial function and protects from ischemia-reperfusion-induced lung edema.
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Affiliation(s)
- Jonas Weber
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Suhasini Rajan
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Christian Schremmer
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Yu-Kai Chao
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Gabriela Krasteva-Christ
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Homburg, Germany
| | - Martina Kannler
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Ali Önder Yildirim
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, a member of the DZL, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany
| | - Monika Brosien
- Justus Liebig University Giessen, Cardio-Pulmonary Institute, University of Giessen and Marburg Lung Center, a member of the DZL, Giessen, Germany
| | - Johann Schredelseker
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Norbert Weissmann
- Justus Liebig University Giessen, Cardio-Pulmonary Institute, University of Giessen and Marburg Lung Center, a member of the DZL, Giessen, Germany
| | - Christian Grimm
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Thomas Gudermann
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
| | - Alexander Dietrich
- Walther Straub Institute of Pharmacology and Toxicology, a member of the German Center for Lung Research (DZL), Ludwig Maximilian University of Munich, Munich Germany
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