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McKinzie SR, Kaverina N, Schweickart RA, Chaney CP, Eng DG, Pereira BMV, Kestenbaum B, Pippin JW, Wessely O, Shankland SJ. Podocytes from hypertensive and obese mice acquire an inflammatory, senescent, and aged phenotype. Am J Physiol Renal Physiol 2024; 326:F644-F660. [PMID: 38420674 PMCID: PMC11208020 DOI: 10.1152/ajprenal.00417.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 02/20/2024] [Accepted: 02/20/2024] [Indexed: 03/02/2024] Open
Abstract
Patients with hypertension or obesity can develop glomerular dysfunction characterized by injury and depletion of podocytes. To better understand the molecular processes involved, young mice were treated with either deoxycorticosterone acetate (DOCA) or fed a high-fat diet (HFD) to induce hypertension or obesity, respectively. The transcriptional changes associated with these phenotypes were measured by unbiased bulk mRNA sequencing of isolated podocytes from experimental models and their respective controls. Key findings were validated by immunostaining. In addition to a decrease in canonical proteins and reduced podocyte number, podocytes from both hypertensive and obese mice exhibited a sterile inflammatory phenotype characterized by increases in NLR family pyrin domain containing 3 (NLRP3) inflammasome, protein cell death-1, and Toll-like receptor pathways. Finally, although the mice were young, podocytes in both models exhibited increased expression of senescence and aging genes, including genes consistent with a senescence-associated secretory phenotype. However, there were differences between the hypertension- and obesity-associated senescence phenotypes. Both show stress-induced podocyte senescence characterized by increased p21 and p53. Moreover, in hypertensive mice, this is superimposed upon age-associated podocyte senescence characterized by increased p16 and p19. These results suggest that senescence, aging, and inflammation are critical aspects of the podocyte phenotype in experimental hypertension and obesity in mice.NEW & NOTEWORTHY Hypertension and obesity can lead to glomerular dysfunction in patients, causing podocyte injury and depletion. Here, young mice given deoxycorticosterone acetate or a high-fat diet to induce hypertension or obesity, respectively. mRNA sequencing of isolated podocytes showed transcriptional changes consistent with senescence, a senescent-associated secretory phenotype, and aging, which was confirmed by immunostaining. Ongoing studies are determining the mechanistic roles of the accelerated aging podocyte phenotype in experimental hypertension and obesity.
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Affiliation(s)
- Sierra R McKinzie
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Natalya Kaverina
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | | | - Christopher P Chaney
- Department of Medicine, University of Texas Southwestern, Dallas, Texas, United States
| | - Diana G Eng
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | | | - Bryan Kestenbaum
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Jeffrey W Pippin
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Oliver Wessely
- Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio, United States
| | - Stuart J Shankland
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
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Röss H, Aaldijk D, Vladymyrov M, Odriozola A, Djonov V. Transluminal Pillars-Their Origin and Role in the Remodelling of the Zebrafish Caudal Vein Plexus. Int J Mol Sci 2023; 24:16703. [PMID: 38069025 PMCID: PMC10706262 DOI: 10.3390/ijms242316703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/10/2023] [Accepted: 11/16/2023] [Indexed: 12/18/2023] Open
Abstract
Intussusceptive pillars, regarded as a hallmark of intussusceptive angiogenesis, have been described in developing vasculature of many organs and organisms. The aim of this study was to resolve the question about pillar formation and their further maturation employing zebrafish caudal vein plexus (CVP). The CVP development was monitored by in vivo confocal microscopy in high spatio-temporal resolution using the transgenic zebrafish model Fli1a:eGPF//Gata1:dsRed. We tracked back the formation of pillars (diameter ≤ 4 µm) and intercapillary meshes (diameter > 4 µm) and analysed their morphology and behaviour. Transluminal pillars in the CVP arose via a combination of sprouting, lumen expansion, and/or the creation of intraluminal folds, and those mechanisms were not associated directly with blood flow. The follow-up of pillars indicated that one-third of them disappeared between 28 and 48 h post fertilisation (hpf), and of the remaining ones, only 1/17 changed their cross-section area by >50%. The majority of the bigger meshes (39/62) increased their cross-section area by >50%. Plexus simplification and the establishment of hierarchy were dominated by the dynamics of intercapillary meshes, which formed mainly via sprouting angiogenesis. These meshes were observed to grow, reshape, and merge with each other. Our observations suggested an alternative view on intussusceptive angiogenesis in the CVP.
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Affiliation(s)
- Helena Röss
- Institute of Anatomy, University of Bern, 3012 Bern, Switzerland; (H.R.); (D.A.); (A.O.)
| | - Dea Aaldijk
- Institute of Anatomy, University of Bern, 3012 Bern, Switzerland; (H.R.); (D.A.); (A.O.)
| | | | - Adolfo Odriozola
- Institute of Anatomy, University of Bern, 3012 Bern, Switzerland; (H.R.); (D.A.); (A.O.)
| | - Valentin Djonov
- Institute of Anatomy, University of Bern, 3012 Bern, Switzerland; (H.R.); (D.A.); (A.O.)
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Kiernan E, Surapaneni A, Zhou L, Schlosser P, Walker KA, Rhee EP, Ballantyne CM, Deo R, Dubin RF, Ganz P, Coresh J, Grams ME. Alterations in the Circulating Proteome Associated with Albuminuria. J Am Soc Nephrol 2023; 34:1078-1089. [PMID: 36890639 PMCID: PMC10278823 DOI: 10.1681/asn.0000000000000108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 02/05/2023] [Indexed: 03/10/2023] Open
Abstract
SIGNIFICANCE STATEMENT We describe circulating proteins associated with albuminuria in a population of African American Study of Kidney Disease and Hypertension with CKD (AASK) using the largest proteomic platform to date: nearly 7000 circulating proteins, representing approximately 2000 new targets. Findings were replicated in a subset of a general population cohort with kidney disease (ARIC) and a population with CKD Chronic Renal Insufficiency Cohort (CRIC). In cross-sectional analysis, 104 proteins were significantly associated with albuminuria in the Black group, of which 67 of 77 available proteins were replicated in ARIC and 68 of 71 available proteins in CRIC. LMAN2, TNFSFR1B, and members of the ephrin superfamily had the strongest associations. Pathway analysis also demonstrated enrichment of ephrin family proteins. BACKGROUND Proteomic techniques have facilitated understanding of pathways that mediate decline in GFR. Albuminuria is a key component of CKD diagnosis, staging, and prognosis but has been less studied than GFR. We sought to investigate circulating proteins associated with higher albuminuria. METHODS We evaluated the cross-sectional associations of the blood proteome with albuminuria and longitudinally with doubling of albuminuria in the African American Study of Kidney Disease and Hypertension (AASK; 38% female; mean GFR 46; median urine protein-to-creatinine ratio 81 mg/g; n =703) and replicated in two external cohorts: a subset of the Atherosclerosis Risk in Communities (ARIC) study with CKD and the Chronic Renal Insufficiency Cohort (CRIC). RESULTS In cross-sectional analysis, 104 proteins were significantly associated with albuminuria in AASK, of which 67 of 77 available proteins were replicated in ARIC and 68 of 71 available proteins in CRIC. Proteins with the strongest associations included LMAN2, TNFSFR1B, and members of the ephrin superfamily. Pathway analysis also demonstrated enrichment of ephrin family proteins. Five proteins were significantly associated with worsening albuminuria in AASK, including LMAN2 and EFNA4, which were replicated in ARIC and CRIC. CONCLUSIONS Among individuals with CKD, large-scale proteomic analysis identified known and novel proteins associated with albuminuria and suggested a role for ephrin signaling in albuminuria progression.
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Affiliation(s)
- Elizabeth Kiernan
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Aditya Surapaneni
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
- Division of Precision Medicine, New York University Grossman School of Medicine, New York, New York
| | - Linda Zhou
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
| | - Pascal Schlosser
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
| | - Keenan A. Walker
- Laboratory of Behavioral Neuroscience, Intramural Research Program, National Institute on Aging, Baltimore, Maryland
| | - Eugene P. Rhee
- Nephrology Division and Endocrine Unit, Massachusetts General Hospital, Boston, Massachusetts
| | | | - Rajat Deo
- Division of Cardiovascular Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ruth F. Dubin
- Division of Nephrology, University of Texas—Southwestern, Dallas, Texas
| | - Peter Ganz
- Division of Cardiology, Zuckerberg San Francisco General Hospital and Department of Medicine, University of California San Francisco, San Francisco, California
| | - Josef Coresh
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
- Department of Biostatistics, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
| | - Morgan E. Grams
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
- Division of Precision Medicine, New York University Grossman School of Medicine, New York, New York
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Oszwald A, Mejía-Pedroza RA, Schachner H, Aigner C, Rees A, Kain R. Digital Spatial Profiling of Glomerular Gene Expression in Pauci-Immune Focal Necrotizing Glomerulonephritis. KIDNEY360 2023; 4:83-91. [PMID: 36700908 PMCID: PMC10101620 DOI: 10.34067/kid.000461202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 11/09/2022] [Indexed: 01/27/2023]
Abstract
Pauci-immune focal necrotizing glomerulonephritis (piFNGN) involves asynchronous onset and progression of injurious lesions in biopsies. Pathologists can describe this heterogeneity within a biopsy, but translating the information into prognostic or expression analyses is challenging. Understanding the underlying molecular processes could improve treatment; however, bulk or single-cell transcriptomic analyses of dissociated tissue disregard the heterogeneity of glomerular injury. We characterize protein and mRNA expression of individual glomeruli in 20 biopsies from 18 patients with antineutrophil cytoplasmic antibody-associated piFNGN using the NanoString digital spatial profiling (DSP) platform. For this purpose, circular annotations of glomeruli were analyzed using protein, immuno-oncology RNA, and Cancer Transcriptome Atlas panels (n=120, 72, and 48 glomeruli, respectively). Histologic evaluation of glomerular patterns of injury was performed in adjacent serial sections. Expression data were processed by log2 transformation, quantile normalization, and batch adjustment. DSP revealed distinct but overlapping gene expression profiles relating to the morphological evolution of injurious lesions, including dynamic expression of various immune checkpoint regulators. Enrichment analysis indicated deregulated pathways that underline known and highlight novel potential mechanisms of disease. Moreover, by capturing individual glomeruli, DSP describes heterogeneity between and within biopsies. We demonstrate the benefit of spatial profiling for characterization of heterogeneous glomerular injury, indicating novel molecular correlates of glomerular injury in piFNGN.
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Affiliation(s)
- André Oszwald
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | | | - Helga Schachner
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | - Christof Aigner
- Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Andrew Rees
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | - Renate Kain
- Department of Pathology, Medical University of Vienna, Vienna, Austria
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Du Cheyne C, Smeets M, De Spiegelaere W. Techniques used to assess intussusceptive angiogenesis: A systematic review. Dev Dyn 2021; 250:1704-1716. [PMID: 34101289 DOI: 10.1002/dvdy.382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 04/25/2021] [Accepted: 06/03/2021] [Indexed: 12/18/2022] Open
Abstract
Intussusceptive angiogenesis (IA) is an important physiological form of angiogenesis in which an existing vessel splits in two by the formation of an intraluminal tissue pillar. The presence of these intraluminal pillars form the hallmark of ongoing IA in growing vascular beds. However, their visualization is technically challenging. The goal of this systematic review was to investigate which techniques are being used to identify intraluminal pillars and to formulate important points to keep in mind when studying IA. A systematic literature search resulted in 154 evaluated articles of which the majority (65%) provided sufficient data to unambiguously demonstrate the presence of intraluminal pillars. Scanning electron microscopy imaging of vascular corrosion casts and serial sectioning of ultrathin sections are the most used techniques. New methods such as serial block face scanning electron microscopy and micro computed tomography (μCT) are gaining importance. Moreover, our results indicate that IA was studied in a variety of animals and tissues. IA is a biologically very relevant form of angiogenesis. Techniques to visualize intraluminal pillars need to have a minimal resolution of 1 μm and should provide information on the 3D-nature of the pillars. Optimally, several techniques are combined to demonstrate ongoing IA.
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Affiliation(s)
- Charis Du Cheyne
- Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Marloes Smeets
- Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Ward De Spiegelaere
- Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Mancardi D, Arrigo E, Cozzi M, Cecchi I, Radin M, Fenoglio R, Roccatello D, Sciascia S. Endothelial dysfunction and cardiovascular risk in lupus nephritis: New roles for old players? Eur J Clin Invest 2021; 51:e13441. [PMID: 33128260 DOI: 10.1111/eci.13441] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/23/2020] [Accepted: 10/28/2020] [Indexed: 12/19/2022]
Abstract
In systemic lupus erythematosus (SLE) patients, most of the clinical manifestation share a vascular component triggered by endothelial dysfunction. Endothelial cells (ECs) activation occurs both on the arterial and venous side, and the high vascular density of kidneys accounts for the detrimental outcomes of SLE through lupus nephritis (LN). Kidney damage, in turn, exerts a negative feedback on the cardiovascular (CV) system aggravating risk factors for CV diseases such as hypertension, stroke and coronary syndrome among others. Despite the intensive investigation on SLE and LN, the role of endothelial dysfunction, as well as the underlying mechanisms, remains to be fully understood, with no specifically targeted pharmacological treatment. It is not known, in fact, if the activation pathway(s) in venous ECs are similar to the one in arterial ECs and doubts persist on the shared manifestation of microcirculation compared to macrocirculation. In this work, we aim to review the recent literature about the role of endothelial activation and dysfunction in the development of CV complications in SLE and LN patients. We, therefore, focus on arteriovenous similarities and differences and on specific pathways of great vessels compared to capillaries. Critically summarising the available data is of pivotal importance for both basic researchers and clinicians in order to develop and test new pharmacological approaches in the treatment of basic components of SLE and LN.
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Affiliation(s)
- Daniele Mancardi
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Elisa Arrigo
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Martina Cozzi
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy.,School of Specialization in Nephrology, University of Verona, Verona, Italy
| | - Irene Cecchi
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy
| | - Massimo Radin
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy
| | - Roberta Fenoglio
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy
| | - Dario Roccatello
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy
| | - Savino Sciascia
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Nephrology and Dialysis S. Giovanni Bosco Hospital, University of Turin, Turin, Italy
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Neuber C, Tröster A, Löser R, Belter B, Schwalbe H, Pietzsch J. The Pyrazolo[3,4- d]pyrimidine-Based Kinase Inhibitor NVP-BHG712: Effects of Regioisomers on Tumor Growth, Perfusion, and Hypoxia in EphB4-Positive A375 Melanoma Xenografts. Molecules 2020; 25:molecules25215115. [PMID: 33153234 PMCID: PMC7662635 DOI: 10.3390/molecules25215115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/29/2020] [Accepted: 11/01/2020] [Indexed: 12/02/2022] Open
Abstract
In a previous study, EphB4 was demonstrated to be a positive regulator of A375-melanoma growth but a negative regulator of tumor vascularization and perfusion. To distinguish between EphB4 forward and ephrinB2 reverse signaling, we used the commercially available EphB4 kinase inhibitor NVP-BHG712 (NVP), which was later identified as its regioisomer NVPiso. Since there have been reported significant differences between the inhibition profiles of NVP and NVPiso, we compared the influence of NVP and NVPiso on tumor characteristics under the same experimental conditions. Despite the different inhibitory profiles of NVP and NVPiso, the comparative study conducted here showed the same EphB4-induced effects in vivo as in the previous investigation. This confirmed the conclusion that EphB4-ephrinB2 reverse signaling is responsible for increased tumor growth as well as decreased tumor vascularization and perfusion. These results are further substantiated by microarrays showing differences between mock-transfected and EphB4-transfected (A375-EphB4) cells with respect to at least 9 angiogenesis-related proteins. Decreased expression of vascular endothelial growth factor (VEGF), angiotensin 1 (Ang-1), and protein kinase B (Akt/PKB), together with the increased expression of tissue inhibitor of metalloproteinase-1 (TIMP-1) and transforming growth factor beta-2 (TGF-β2), is consistent with the impaired vascularization of A375-EphB4 xenografts. Functional overexpression of EphB4 in A375-EphB4 cells was confirmed by activation of a variety of signaling pathways, including the Janus kinase/signal transducers and activators of transcription (JAK/STAT), rat sarcoma virus/rapidly accelerated fibrosarcoma/mitogen activated protein kinase kinase (Ras/Raf/MEK), and nuclear factor kappa-B (NFkB) pathways.
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Affiliation(s)
- Christin Neuber
- Institute of Radiopharmaceutical Cancer Research, Department Radiopharmaceutical and Chemical Biology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany; (C.N.); (R.L.); (B.B.)
| | - Alix Tröster
- Centre for Biomolecular Magnetic Resonance (BMRZ), Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt a. M., Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany; (A.T.); (H.S.)
| | - Reik Löser
- Institute of Radiopharmaceutical Cancer Research, Department Radiopharmaceutical and Chemical Biology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany; (C.N.); (R.L.); (B.B.)
- Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, 01069 Dresden, Germany
| | - Birgit Belter
- Institute of Radiopharmaceutical Cancer Research, Department Radiopharmaceutical and Chemical Biology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany; (C.N.); (R.L.); (B.B.)
| | - Harald Schwalbe
- Centre for Biomolecular Magnetic Resonance (BMRZ), Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt a. M., Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany; (A.T.); (H.S.)
| | - Jens Pietzsch
- Institute of Radiopharmaceutical Cancer Research, Department Radiopharmaceutical and Chemical Biology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany; (C.N.); (R.L.); (B.B.)
- Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, 01069 Dresden, Germany
- Correspondence: ; Tel.: +49-351-260-2622
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Lu T, Bian Y, Zhu Y, Guo M, Yang Y, Guo J, Gu C, Duan JA. HUANGKUISIWUFANG inhibits pyruvate dehydrogenase to improve glomerular injury in anti-Thy1 nephritis model. JOURNAL OF ETHNOPHARMACOLOGY 2020; 253:112682. [PMID: 32087318 DOI: 10.1016/j.jep.2020.112682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 12/05/2019] [Accepted: 02/17/2020] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Huangkuisiwufang (HKSWF) is composed of Abelmoschus manihot (L.) Medik., Astragalus mongholicus, Polygonum cuspidatum, Curcuma longa L. Abelmoschus Manihot (L.) Medik. has been widely used for the treatment of chronic renal disease, oral ulcers and burn in China for centuries (Committee of the Pharmacopoeia of PR China, 2010). Abelmoschus manihot (L.) Medik., Polygonum cuspidatum, Curcuma longa L. have been mainly applied in folk medicine for their therapeutic effects on diabetes, cancer, heart disease and other diseases. AIM OF THE STUDY We aimed to investigate the renoprotective function of HKSWF in anti-Thy nephritis model and clarify the relevant mechanisms. MATERIALS AND METHODS One week after the model of glomerulonephritis created by injecting anti-thymocyte serum (ATS), rats were treated with Huangkui capsule, enalapril or HKSWF by gavage for a period of 8 weeks. The therapeutic effect was evaluated by detection of proteinuria, plasma creatine, blood urea nitrogen (BUN), podocyte injury, glomerular accumulation of extracellular matrix (ECM) and the markers of oxidative stress and renal fibrosis. RNA Sequencing (RNA-seq), KEGG and western blotting analysis were performed to indicate the signaling pathway involved in the therapeutic effect of HKSWF. RESULTS Nephritic rats presented the increase of BUN, serum creatinine (Scr), proteinuria, podocyte damage, glomerular fibrosis, Ang II type 1 receptor (AT1R), and the reduction of creatinine clearance (Ccr). In contrast, application of HKSWF to nephritic rats decreased the levels of BUN and proteinuria, promoted mesangial cell recovery and improved oxidative stress level and podocyte injury. KEGG analysis revealed that pyruvate metabolism was the most significantly upregulated pathway in rats treated with HKSWF compared to disease control group. Increased pyruvate dehydrogenase and PAI-1 caused by nephritis was inhibited by HKSWF interposition. Furthermore, dichloroacetate sodium (DCA), an agonist of pyruvate dehydrogenase, could stimulate PAI-1 expression, which was suppressed by HKSWF. CONCLUSION Chinese herbal preparation HKSWF has remarkable curative effects on glomerulonephritis animals. HKSWF attenuates pyruvate dehydrogenase to improve glomerular injury.
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Affiliation(s)
- Ting Lu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing, 210023, China; School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicisne, 210023, Nanjing, China
| | - Yong Bian
- Laboratory Animal Center, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Yan Zhu
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicisne, 210023, Nanjing, China
| | - Mengjie Guo
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicisne, 210023, Nanjing, China
| | - Ye Yang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicisne, 210023, Nanjing, China
| | - Jianming Guo
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing, 210023, China; Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, China.
| | - Chunyan Gu
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicisne, 210023, Nanjing, China.
| | - Jin-Ao Duan
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing, 210023, China; Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, China.
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9
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Saravanan S, Vimalraj S, Pavani K, Nikarika R, Sumantran VN. Intussusceptive angiogenesis as a key therapeutic target for cancer therapy. Life Sci 2020; 252:117670. [PMID: 32298741 DOI: 10.1016/j.lfs.2020.117670] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 04/08/2020] [Accepted: 04/10/2020] [Indexed: 12/20/2022]
Abstract
Deregulation of angiogenesis is a key reason for tumor growth and progression. Several anti-angiogenic drugs in clinical practice attempt to normalize abnormal tumor vasculature. Unfortunately, these drugs are ineffective due to the development of resistance in patients after drug holidays. A sizable literature suggests that resistance to these anti-angiogenic drugs occurs due to various compensatory mechanisms of tumor angiogenesis. Therefore, we describe different compensatory mechanisms of tumor angiogenesis, and explain why intussusceptive angiogenesis (IA), is a crucial mechanism of compensatory angiogenesis in tumors which resist anti-VEGF (vascular endothelial growth factor) therapies. IA is often overlooked due to the scarcity of experimental models. Therefore, we examine data from existing experimental models and our novel ex-ovo model of angiogenesis in chick embryos, and explain the important genes and signaling pathways driving IA. Using bio-informatic analyses of major genes regulating conventional sprouting angiogenesis (SA) and intussusceptive angiogenesis, we provide fresh insights on the 'angiogenic switch' which regulates the transition from SA to IA. Finally, we examine the interplay between molecules regulating SA, IA, and molecules known to promote tumor progression. Based on these analyses, we conclude that intussusceptive angiogenesis (IA) is a promising therapeutic target for developing effective anti-cancer treatment regimes.
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Affiliation(s)
- Sekaran Saravanan
- Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), Department of Bioengineering, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India
| | - Selvaraj Vimalraj
- Centre for Biotechnology, Anna University, Chennai 600 025, Tamil Nadu, India.
| | - Koka Pavani
- Centre for Biotechnology, Anna University, Chennai 600 025, Tamil Nadu, India
| | - Ramesh Nikarika
- Centre for Biotechnology, Anna University, Chennai 600 025, Tamil Nadu, India
| | - Venil N Sumantran
- Abdul Kalam Center for Innovation and Entrepreneurship, Dr. MGR Educational & Research Institute, Maduravoyal, Chennai 600095, India
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10
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Beamish IV, Hinck L, Kennedy TE. Making Connections: Guidance Cues and Receptors at Nonneural Cell-Cell Junctions. Cold Spring Harb Perspect Biol 2018; 10:a029165. [PMID: 28847900 PMCID: PMC6211390 DOI: 10.1101/cshperspect.a029165] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The field of axon guidance was revolutionized over the past three decades by the identification of highly conserved families of guidance cues and receptors. These proteins are essential for normal neural development and function, directing cell and axon migration, neuron-glial interactions, and synapse formation and plasticity. Many of these genes are also expressed outside the nervous system in which they influence cell migration, adhesion and proliferation. Because the nervous system develops from neural epithelium, it is perhaps not surprising that these guidance cues have significant nonneural roles in governing the specialized junctional connections between cells in polarized epithelia. The following review addresses roles for ephrins, semaphorins, netrins, slits and their receptors in regulating adherens, tight, and gap junctions in nonneural epithelia and endothelia.
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Affiliation(s)
- Ian V Beamish
- Department of Neurology & Neurosurgery, Montréal Neurological Institute, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Lindsay Hinck
- Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, California 95064
| | - Timothy E Kennedy
- Department of Neurology & Neurosurgery, Montréal Neurological Institute, McGill University, Montréal, Quebec H3A 2B4, Canada
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11
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Del Greco M F, Foco L, Pichler I, Eller P, Eller K, Benyamin B, Whitfield JB, Pramstaller PP, Thompson JR, Pattaro C, Minelli C. Serum iron level and kidney function: a Mendelian randomization study. Nephrol Dial Transplant 2018; 32:273-278. [PMID: 28186534 DOI: 10.1093/ndt/gfw215] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 04/25/2016] [Indexed: 01/01/2023] Open
Abstract
Background Iron depletion is a known consequence of chronic kidney disease (CKD), but there is contradicting epidemiological evidence on whether iron itself affects kidney function and whether its effect is protective or detrimental in the general population. While epidemiological studies tend to be affected by confounding and reverse causation, Mendelian randomization (MR) can provide unconfounded estimates of causal effects by using genes as instruments. Methods We performed an MR study of the effect of serum iron levels on estimated glomerular filtration rate (eGFR), using genetic variants known to be associated with iron. MR estimates of the effect of iron on eGFR were derived based on the association of each variant with iron and eGFR from two large genome-wide meta-analyses on 48 978 and 74 354 individuals. We performed a similar MR analysis for ferritin, which measures iron stored in the body, using variants associated with ferritin. Results A combined MR estimate across all variants showed a 1.3% increase in eGFR per standard deviation increase in iron (95% confidence interval 0.4–2.1%; P = 0.004). The results for ferritin were consistent with those for iron. Secondary MR analyses of the effects of iron and ferritin on CKD did not show significant associations but had very low statistical power. Conclusions Our study suggests a protective effect of iron on kidney function in the general population. Further research is required to confirm this causal association, investigate it in study populations at higher risk of CKD and explore its underlying mechanism of action.
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Affiliation(s)
- Fabiola Del Greco M
- Center for Biomedicine, European Academy of Bolzano/Bozen (EURAC), affiliated with the University of Lübeck, Via Galvani 31, Bolzano, Italy
| | - Luisa Foco
- Center for Biomedicine, European Academy of Bolzano/Bozen (EURAC), affiliated with the University of Lübeck, Via Galvani 31, Bolzano, Italy
| | - Irene Pichler
- Center for Biomedicine, European Academy of Bolzano/Bozen (EURAC), affiliated with the University of Lübeck, Via Galvani 31, Bolzano, Italy
| | | | | | - Beben Benyamin
- QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.,Queensland Brain Institute, University of Queensland, Brisbane, Queensland, Australia
| | - John B Whitfield
- QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | | | | | - Peter P Pramstaller
- Center for Biomedicine, European Academy of Bolzano/Bozen (EURAC), affiliated with the University of Lübeck, Via Galvani 31, Bolzano, Italy
| | - John R Thompson
- Department of Health Sciences, University of Leicester, Leicester, UK
| | - Cristian Pattaro
- Center for Biomedicine, European Academy of Bolzano/Bozen (EURAC), affiliated with the University of Lübeck, Via Galvani 31, Bolzano, Italy
| | - Cosetta Minelli
- Population Health and Occupational Disease, National Heart and Lung Institute, Imperial College, Emmanuel Kaye Building, 1 Manresa Road, London, UK
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12
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Hlushchuk R, Styp-Rekowska B, Dzambazi J, Wnuk M, Huynh-Do U, Makanya A, Djonov V. Endoglin inhibition leads to intussusceptive angiogenesis via activation of factors related to COUP-TFII signaling pathway. PLoS One 2017; 12:e0182813. [PMID: 28859090 PMCID: PMC5578572 DOI: 10.1371/journal.pone.0182813] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 07/25/2017] [Indexed: 12/11/2022] Open
Abstract
Angiogenesis is a highly coordinated, extremely complex process orchestrated by multiple signaling molecules and blood flow conditions. While sprouting mode of angiogenesis is very well investigated, the molecular mechanisms underlying intussusception, the second mode of angiogenesis, remain largely unclear. In the current study two molecules involved in vascular growth and differentiation, namely endoglin (ENG/CD105) and chicken ovalbumin upstream promoter transcription factor II (COUP-TFII) were examined to unravel their specific roles in angiogenesis. Down- respectively up-regulation of both molecules tightly correlates with intussusceptive microvascular growth. Upon ENG inhibition in chicken embryo model, formation of irregular capillary meshwork accompanied by increased expression of COUP-TFII could be observed. This dynamic expression pattern of ENG and COUP-TFII during vascular development and remodeling correlated with formation of pillars and progression of intussusceptive angiogenesis. Similar findings could be observed in mammalian model of acute rat Thy1.1 glomerulonephritis, which was induced by intravenous injection of anti-Thy1 antibody and has shown upregulation of COUP-TFII in initial phase of intussusception, while ENG expression was not disturbed compared to the controls but decreased over the time of pillar formation. In this study, we have shown that ENG inhibition and at the same time up-regulation of COUP-TFII expression promotes intussusceptive angiogenesis.
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Affiliation(s)
| | | | | | - Monika Wnuk
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | - Uyen Huynh-Do
- Department of Nephrology and Hypertension, Inselspital Bern, Bern, Switzerland
| | - Andrew Makanya
- Institute of Anatomy, University of Bern, Bern, Switzerland
- Department of Veterinary Anatomy and Physiology, University of Nairobi, Nairobi, Kenya
| | - Valentin Djonov
- Institute of Anatomy, University of Bern, Bern, Switzerland
- * E-mail:
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13
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Bidirectional signalling between EphA2 and ephrinA1 increases tubular cell attachment, laminin secretion and modulates erythropoietin expression after renal hypoxic injury. Pflugers Arch 2016; 468:1433-48. [PMID: 27228995 DOI: 10.1007/s00424-016-1838-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/01/2016] [Accepted: 05/10/2016] [Indexed: 10/21/2022]
Abstract
Acute kidney injury (AKI) is common in hospitalized patients and has a poor prognosis, the severity of AKI being linked to progression to chronic kidney disease. This stresses the need to search for protective mechanisms during the acute phase. We investigated kidney repair after hypoxic injury using a rat model of renal artery branch ligation, which led to an oxygen gradient vertical to the corticomedullary axis. Three distinct zones were observed: tubular necrosis, infarction border zone and preserved normal tissue. EphA2 is a receptor tyrosine kinase with pivotal roles in cell architecture, migration and survival, upon juxtacrine contact with its membrane-bound ligand EphrinA1. Following hypoxia, EphA2 was up-regulated in cortical and medullary tubular cells, while EphrinA1 was up-regulated in interstitial cells adjacent to peritubular capillaries. Moreover, erythropoietin (EPO) messenger RNA (mRNA) was strongly expressed in the border zone of infarcted kidney within the first 6 h. To gain more insight into the biological impact of EphA2 and EphrinA1 up-regulation, we activated the signalling pathways in vitro using recombinant EphrinA1/Fc or EphA2/Fc proteins. Stimulation of EphA2 forward signalling in the proximal tubular cell line HK2 increased cell attachment and laminin secretion at the baso-lateral side. Conversely, activation of reverse signalling through EphrinA1 expressed by Hep3B cells promoted EPO production at both the transcriptional and protein level. Strikingly, in co-culture experiments, juxtacrine contact between EphA2 expressing MDCK and EphrinA1 expressing Hep3B was sufficient to induce a significant up-regulation of EPO mRNA production in the latter cells, even in the absence of hypoxic conditions. The synergistic effects of EphA2 and hypoxia led to a 15-20-fold increase of EPO expression. Collectively, our results suggest an important role of EphA2/EphrinA1 signalling in kidney repair after hypoxic injury through stimulation of (i) tubular cell attachment, (ii) secretion of basal membrane proteins and (iii) EPO production. These findings could thus pave the way to new therapeutic approaches.
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14
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Eph/ephrin signaling in the kidney and lower urinary tract. Pediatr Nephrol 2016; 31:359-71. [PMID: 25903642 DOI: 10.1007/s00467-015-3112-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 02/06/2023]
Abstract
Development and homeostasis of the highly specialized cell types and tissues that constitute the organs of the urinary system, the kidneys and ureters, the bladder, and the urethra, require the tightly regulated exchange of signals in and between these tissues. Eph/ephrin signaling is a bidirectional signaling pathway that has been functionally implicated in many developmental and homeostatic contexts, most prominently in the vascular and neural system. Expression and knockout analyses have now provided evidence that Eph/ephrin signaling is of crucial relevance for cell and tissue interactions in the urinary system as well. A clear requirement has emerged in the formation of the vesicoureteric junction, in urorectal septation and glomerulogenesis during embryonic development, in maintenance of medullary tubular cells and podocytes in homeostasis, and in podocyte and glomerular injury responses. Deregulation of Eph/ephrin signaling may also contribute to the formation and progression of tumors in the urinary system, most prominently bladder and renal cell carcinoma. While in the embryonic contexts Eph/ephrin signaling regulates adhesion of epithelial cells, in the adult setting, cell-shape changes and cell survival seem to be the primary cellular processes mediated by this signaling module. With progression of the genetic analyses of mice conditionally mutant for compound alleles of Eph receptor and ephrin ligand genes, additional essential functions are likely to arise in the urinary system.
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15
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16
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Conway BR, Betz B, Sheldrake TA, Manning JR, Dunbar DR, Dobyns A, Hughes J, Mullins JJ. Tight blood glycaemic and blood pressure control in experimental diabetic nephropathy reduces extracellular matrix production without regression of fibrosis. Nephrology (Carlton) 2015; 19:802-13. [PMID: 25196678 DOI: 10.1111/nep.12335] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/01/2014] [Indexed: 01/15/2023]
Abstract
AIMS Regression of albuminuria and renal fibrosis occurs in patients with diabetic nephropathy (DN) following tight control of blood glucose and blood pressure, however the pathways that promote regression remain poorly understood and we wished to characterize these using a rodent model. METHODS Diabetes was induced with streptozotocin in Cyp1a1mRen2 rats and hypertension was generated by inducing renin transgene expression with dietary indole-3-carbinol (I-3-C) for 28 weeks. At this point an 'injury cohort' was culled, while in a 'reversal cohort' glycaemia was tightly controlled using insulin implants and blood pressure normalized by withdrawing dietary I-3-C for a further 8 weeks. Pathways activated during and following reversal of diabetes and hypertension were assessed by microarray profiling. RESULTS Tight control of blood glucose and blood pressure reduced albuminuria and renal hypertrophy, but had no impact on renal fibrosis. 85 genes were up-regulated specifically during the injury phase, including genes encoding multiple myofibroblast and extracellular matrix (ECM) proteins. Conversely, 314 genes remained persistently elevated during reversal including genes linked to innate/adaptive immunity, phagocytosis, lysosomal processing and degradative metalloproteinases (MMPs). Despite increased MMP gene expression, MMP activity was suppressed during both injury and reversal, in association with up-regulation of tissue inhibitor of metalloproteinase-1 (TIMP-1) protein. Physical separation of the TIMP-1/MMP complexes during zymography of tissue homogenate restored MMP activity. CONCLUSION Normalization of blood glucose and pressure ameliorates albuminuria and inhibits excess ECM production, however persistent TIMP-1 expression hinders attempts at ECM remodelling. Therapies which counteract the action of TIMPs may accelerate scar resolution.
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Affiliation(s)
- Bryan R Conway
- Centre for Cardiovascular Science, British Heart Foundation/University of Edinburgh, Edinburgh, UK
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17
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Wang Y, Thorin E, Luo H, Tremblay J, Lavoie JL, Wu Z, Peng J, Qi S, Wu J. EPHB4 Protein Expression in Vascular Smooth Muscle Cells Regulates Their Contractility, and EPHB4 Deletion Leads to Hypotension in Mice. J Biol Chem 2015; 290:14235-44. [PMID: 25903126 DOI: 10.1074/jbc.m114.621615] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Indexed: 11/06/2022] Open
Abstract
EPH kinases are the largest family of receptor tyrosine kinases, and their ligands, ephrins (EFNs), are also cell surface molecules. This work presents evidence that EPHB4 on vascular smooth muscle cells (VSMCs) is involved in blood pressure regulation. We generated gene KO mice with smooth muscle cell-specific deletion of EPHB4. Male KO mice, but not female KO mice, were hypotensive. VSMCs from male KO mice showed reduced contractility when compared with their WT counterparts. Signaling both from EFNBs to EPHB4 (forward signaling) and from EPHB4 to EFNB2 (reverse signaling) modulated VSMC contractility. At the molecular level, the absence of EPHB4 in VSMCs resulted in compromised signaling from Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) to myosin light chain kinase (MLCK) to myosin light chain, the last of which controls the contraction force of motor molecule myosin. Near the cell membrane, an adaptor protein GRIP1, which can associate with EFNB2, was found to be essential in mediating EPHB4-to-EFNB reverse signaling, which regulated VSMC contractility, based on siRNA gene knockdown studies. Our research indicates that EPHB4 plays an essential role in regulating small artery contractility and blood pressure.
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Affiliation(s)
- Yujia Wang
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Eric Thorin
- the Montreal Heart Institute, Montreal, Quebec H1T 1C8
| | - Hongyu Luo
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Johanne Tremblay
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Julie L Lavoie
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, the Département de Kinésiologie, Université de Montréal, Montreal, Quebec H3T 1J4, and
| | - Zenghui Wu
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Junzheng Peng
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Shijie Qi
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9
| | - Jiangping Wu
- From the Research Centre, Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, the Nephrology Service, CHUM, Montreal, Quebec H2L 4M1, Canada
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18
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Fukusumi Y, Miyauchi N, Hashimoto T, Saito A, Kawachi H. Therapeutic target for nephrotic syndrome: Identification of novel slit diaphragm associated molecules. World J Nephrol 2014; 3:77-84. [PMID: 25332898 PMCID: PMC4202494 DOI: 10.5527/wjn.v3.i3.77] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 05/15/2014] [Accepted: 06/27/2014] [Indexed: 02/06/2023] Open
Abstract
The slit diaphragm bridging the neighboring foot processes functions as a final barrier of glomerular capillary wall for preventing the leak of plasma proteins into primary urine. It is now accepted that the dysfunction of the sit diaphragm contributes to the development of proteinuria in several glomerular diseases. Nephrin, a gene product of NPHS1, a gene for a congenital nephrotic syndrome of Finnish type, constitutes an extracellular domain of the slit diaphragm. Podocin was identified as a gene product of NPHS2, a gene for a familial steroid-resistant nephrotic syndrome of French. Podocin binds the cytoplasmic domain of nephrin. After then, CD2 associated protein, NEPH1 and transient receptor potential-6 were also found as crucial molecules of the slit diaphragm. In order to explore other novel molecules contributing to the development of proteinuria, we performed a subtraction hybridization assay with a normal rat glomerular RNA and a glomerular RNA of rats with a puromycin aminonucleoside nephropathy, a mimic of a human minimal change type nephrotic syndrome. Then we have found that synaptic vesicle protein 2B, ephrin-B1 and neurexin were already downregulated at the early stage of puromycin aminonucleoside nephropathy, and that these molecules were localized close to nephrin. It is conceivable that these molecules are the slit diaphragm associated molecules, which participate in the regulation of the barrier function. These molecules could be targets to establish a novel therapy for nephrotic syndrome.
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Haenssgen K, Makanya AN, Djonov V. Casting materials and their application in research and teaching. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2014; 20:493-513. [PMID: 24564951 DOI: 10.1017/s1431927613014050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
From a biological point of view, casting refers to filling of anatomical and/or pathological spaces with extraneous material that reproduces a three-dimensional replica of the space. Casting may be accompanied by additional procedures such as corrosion, in which the soft tissue is digested out, leaving a clean cast, or the material may be mixed with radiopaque substances to allow x-ray photography or micro computed topography (µCT) scanning. Alternatively, clearing of the surrounding soft tissue increases transparency and allows visualization of the casted cavities. Combination of casting with tissue fixation allows anatomical dissection and didactic surgical procedures on the tissue. Casting materials fall into three categories namely, aqueous substances (India ink, Prussian blue ink), pliable materials (gelatins, latex, and silicone rubber), or hard materials (methyl methacrylates, polyurethanes, polyesters, and epoxy resins). Casting has proved invaluable in both teaching and research and many phenomenal biological processes have been discovered through casting. The choice of a particular material depends inter alia on the targeted use and the intended subsequent investigative procedures, such as dissection, microscopy, or µCT. The casting material needs to be pliable where anatomical and surgical manipulations are intended, and capillary-passable for ultrastructural investigations.
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Affiliation(s)
- Kati Haenssgen
- 1 Institute of Anatomy, University of Bern, Baltzerstrasse 2, Ch-3000 Bern 9, Switzerland
| | - Andrew N Makanya
- 1 Institute of Anatomy, University of Bern, Baltzerstrasse 2, Ch-3000 Bern 9, Switzerland
| | - Valentin Djonov
- 1 Institute of Anatomy, University of Bern, Baltzerstrasse 2, Ch-3000 Bern 9, Switzerland
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20
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Reiser J, Sever S, Faul C. Signal transduction in podocytes--spotlight on receptor tyrosine kinases. Nat Rev Nephrol 2014; 10:104-15. [PMID: 24394191 PMCID: PMC4109315 DOI: 10.1038/nrneph.2013.274] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The mammalian kidney filtration barrier is a complex multicellular, multicomponent structure that maintains homeostasis by regulating electrolytes, acid-base balance, and blood pressure (via maintenance of salt and water balance). To perform these multiple functions, podocytes--an important component of the filtration apparatus--must process a series of intercellular signals. Integrating these signals with diverse cellular responses enables a coordinated response to various conditions. Although mature podocytes are terminally differentiated and cannot proliferate, they are able to respond to growth factors. It is possible that the initial response of podocytes to growth factors is beneficial and protective, and might include the induction of hypertrophic cell growth. However, extended and/or uncontrolled growth factor signalling might be maladaptive and could result in the induction of apoptosis and podocyte loss. Growth factors signal via the activation of receptor tyrosine kinases (RTKs) on their target cells and around a quarter of the 58 RTK family members that are encoded in the human genome have been identified in podocytes. Pharmacological inhibitors of many RTKs exist and are currently used in experimental and clinical cancer therapy. The identification of pathological RTK-mediated signal transduction pathways in podocytes could provide a starting point for the development of novel therapies for glomerular disorders.
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Affiliation(s)
- Jochen Reiser
- Department of Medicine, Rush University Medical Center, 1735 West Harrison Street, Cohn Building, Suite 724, Chicago, IL 60612, USA
| | - Sanja Sever
- Department of Medicine, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, 149 13th Street, Charlestown, MA 02129, USA
| | - Christian Faul
- Division of Nephrology and Hypertension, University of Miami Miller School of Medicine, 1580 North West 10th Avenue (R-762), Batchelor Building 626, Miami, FL 33136, USA
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21
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Grahammer F, Schell C, Huber TB. Molecular understanding of the slit diaphragm. Pediatr Nephrol 2013; 28:1957-62. [PMID: 23233041 DOI: 10.1007/s00467-012-2375-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 10/16/2012] [Accepted: 10/17/2012] [Indexed: 11/30/2022]
Abstract
Glomerular filtration has always attracted the interest of nephrologists and renal researchers alike. Although several key questions on the structure and function of the kidney filter may have been answered within the last 40 years of intense research, there still remain crucial questions to be solved. The following article attempts to give a brief overview of recent developments in glomerular research highlighting particular advances in our understanding of the slit diaphragm.
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Affiliation(s)
- Florian Grahammer
- Renal Division, University Hospital Freiburg, Hugstetter Strasse 55, Freiburg 79106, Germany
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22
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Dimova I, Hlushchuk R, Makanya A, Styp-Rekowska B, Ceausu A, Flueckiger S, Lang S, Semela D, Le Noble F, Chatterjee S, Djonov V. Inhibition of Notch signaling induces extensive intussusceptive neo-angiogenesis by recruitment of mononuclear cells. Angiogenesis 2013; 16:921-37. [DOI: 10.1007/s10456-013-9366-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/13/2013] [Indexed: 10/26/2022]
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