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Frasconi TM, Kurts C, Dhana E, Kaiser R, Reichelt M, Lukacs-Kornek V, Boor P, Hauser AE, Pascual-Reguant A, Bedoui S, Turner JE, Becker-Gotot J, Ludwig-Portugall I. Renal IL-23-Dependent Type 3 Innate Lymphoid Cells Link Crystal-induced Intrarenal Inflammasome Activation with Kidney Fibrosis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2024; 213:865-875. [PMID: 39072698 PMCID: PMC11372247 DOI: 10.4049/jimmunol.2400041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 07/05/2024] [Indexed: 07/30/2024]
Abstract
Chronic inflammasome activation in mononuclear phagocytes (MNPs) promotes fibrosis in various tissues, including the kidney. The cellular and molecular links between the inflammasome and fibrosis are unclear. To address this question, we fed mice lacking various immunological mediators an adenine-enriched diet, which causes crystal precipitation in renal tubules, crystal-induced inflammasome activation, and renal fibrosis. We found that kidney fibrosis depended on an intrarenal inflammasome-dependent type 3 immune response driven by its signature transcription factor Rorc (retinoic acid receptor-related orphan receptor C gene), which was partially carried out by type 3 innate lymphoid cells (ILC3s). The role of ILCs in the kidney is less well known than in other organs, especially that of ILC3. In this article, we describe that depletion of ILCs or genetic deficiency for Rorc attenuated kidney inflammation and fibrosis. Among the inflammasome-derived cytokines, only IL-1β expanded ILC3 and promoted fibrosis, whereas IL-18 caused differentiation of NKp46+ ILC3. Deficiency of the type 3 maintenance cytokine, IL-23, was more protective than IL-1β inhibition, which may be explained by the downregulation of the IL-1R, but not of the IL-23R, by ILC3 early in the disease, allowing persistent sensing of IL-23. Mechanistically, ILC3s colocalized with renal MNPs in vivo as shown by multiepitope-ligand cartography. Cell culture experiments indicated that renal ILC3s caused renal MNPs to increase TGF-β production that stimulated fibroblasts to produce collagen. We conclude that ILC3s link inflammasome activation with kidney inflammation and fibrosis and are regulated by IL-1β and IL-23.
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Affiliation(s)
- Teresa M Frasconi
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Christian Kurts
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Ermanila Dhana
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Romina Kaiser
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Miriam Reichelt
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Veronika Lukacs-Kornek
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Peter Boor
- Institute of Pathology, Department of Nephrology, RWTH University, Aachen, Germany
| | - Anja E Hauser
- Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Immune Dynamics, Deutsches Rheuma-Forschungszentrum, Leibniz Institute, Berlin, Germany
| | - Anna Pascual-Reguant
- Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Immune Dynamics, Deutsches Rheuma-Forschungszentrum, Leibniz Institute, Berlin, Germany
| | - Sammy Bedoui
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Jan-Eric Turner
- III Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Janine Becker-Gotot
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
| | - Isis Ludwig-Portugall
- Institute of Molecular Medicine and Experimental Immunology, University Hospital Bonn, Bonn, Germany
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2
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Glassman PM, Myerson JW, Ferguson LT, Kiseleva RY, Shuvaev VV, Brenner JS, Muzykantov VR. Targeting drug delivery in the vascular system: Focus on endothelium. Adv Drug Deliv Rev 2020; 157:96-117. [PMID: 32579890 PMCID: PMC7306214 DOI: 10.1016/j.addr.2020.06.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/12/2020] [Accepted: 06/13/2020] [Indexed: 12/16/2022]
Abstract
The bloodstream is the main transporting pathway for drug delivery systems (DDS) from the site of administration to the intended site of action. In many cases, components of the vascular system represent therapeutic targets. Endothelial cells, which line the luminal surface of the vasculature, play a tripartite role of the key target, barrier, or victim of nanomedicines in the bloodstream. Circulating DDS may accumulate in the vascular areas of interest and in off-target areas via mechanisms bypassing specific molecular recognition, but using ligands of specific vascular determinant molecules enables a degree of precision, efficacy, and specificity of delivery unattainable by non-affinity DDS. Three decades of research efforts have focused on specific vascular targeting, which have yielded a multitude of DDS, many of which are currently undergoing a translational phase of development for biomedical applications, including interventions in the cardiovascular, pulmonary, and central nervous systems, regulation of endothelial functions, host defense, and permeation of vascular barriers. We discuss the design of endothelial-targeted nanocarriers, factors underlying their interactions with cells and tissues, and describe examples of their investigational use in models of acute vascular inflammation with an eye on translational challenges.
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Affiliation(s)
- Patrick M Glassman
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America.
| | - Jacob W Myerson
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Laura T Ferguson
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America; Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Raisa Y Kiseleva
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Vladimir V Shuvaev
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Jacob S Brenner
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America; Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Vladimir R Muzykantov
- Department of Systems Pharmacology and Translational Therapeutics, Center for Targeted Therapeutics and Translational Nanomedicine of the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States of America.
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3
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Lübow C, Bockstiegel J, Weindl G. Lysosomotropic drugs enhance pro-inflammatory responses to IL-1β in macrophages by inhibiting internalization of the IL-1 receptor. Biochem Pharmacol 2020; 175:113864. [PMID: 32088265 DOI: 10.1016/j.bcp.2020.113864] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 02/18/2020] [Indexed: 12/20/2022]
Abstract
Interleukin (IL)-1 signaling leads to production of pro-inflammatory mediators and is regulated by receptor endocytosis. Lysosomotropic drugs have been linked to increased pro-inflammatory responses under sterile inflammatory conditions but the underlying mechanisms have not been fully elucidated. Here, we report that lysosomotropic drugs potentiate pro-inflammatory effects in response to IL-1β via a mechanism involving reactive oxygen species, p38 mitogen-activated protein kinase and reduced IL-1 receptor internalization. Chloroquine and hydroxychloroquine increased IL-1β-induced CXCL8 secretion in macrophages which was critically dependent on the lysosomotropic character and inhibition of macroautophagy but independent from the NLRP3 inflammasome. Co-stimulation with the autophagy inducer interferon gamma attenuated CXCL8 release. Other lysosomotropic drugs like bafilomycin A1, fluoxetine and chlorpromazine but also the endocytosis inhibitor dynasore showed similar pro-inflammatory responses. Increased cell surface expression of IL-1 receptor suggests reduced receptor degradation in the presence of lysosomotropic drugs. Our findings provide new insights into a potentially crucial immunoregulatory mechanism in macrophages that may explain how lysosomotropic drugs drive sterile inflammation.
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Affiliation(s)
- Charlotte Lübow
- Freie Universität Berlin, Institute of Pharmacy (Pharmacology and Toxicology), Germany; University of Bonn, Pharmaceutical Institute, Section Pharmacology and Toxicology, Germany
| | - Judith Bockstiegel
- University of Bonn, Pharmaceutical Institute, Section Pharmacology and Toxicology, Germany
| | - Günther Weindl
- Freie Universität Berlin, Institute of Pharmacy (Pharmacology and Toxicology), Germany; University of Bonn, Pharmaceutical Institute, Section Pharmacology and Toxicology, Germany.
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4
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Korsensky L, Haif S, Heller R, Rabinovitz S, Haddad-Halloun J, Dahan N, Ron D. The tumor suppressor Sef is a scaffold for the classical NF-κB/RELA:P50 signaling module. Cell Signal 2019; 59:110-121. [DOI: 10.1016/j.cellsig.2019.01.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 01/26/2019] [Accepted: 01/26/2019] [Indexed: 02/07/2023]
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Miao NJ, Xie HY, Xu D, Yin JY, Wang YZ, Wang B, Yin F, Zhou ZL, Cheng Q, Chen PP, Zhou L, Xue H, Zhang W, Wang XX, Liu J, Lu LM. Caspase-11 promotes renal fibrosis by stimulating IL-1β maturation via activating caspase-1. Acta Pharmacol Sin 2019; 40:790-800. [PMID: 30382182 DOI: 10.1038/s41401-018-0177-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 09/24/2018] [Indexed: 12/28/2022] Open
Abstract
Caspase-11 is a key upstream modulator for activation of inflammatory response under pathological conditions. In this study, we investigated the roles of caspase-11 in the maturation of interleukin-1β (IL-1β) and development of renal interstitial fibrosis in vivo and in vitro. Mice were subjected to unilateral ureteral obstruction (UUO). The mice were treated with either caspase-11 inhibitor wedelolactone (Wed, 30 mg/kg/day, ig) for 7 days or caspase-11 siRNA (10 nmol/20 g body weight per day, iv) for 14 days. The mice were euthanized on day 14, their renal tissue and blood sample were collected. We found that the obstructed kidney had significantly higher caspase-11 levels and obvious tubular injury and interstitial fibrosis. Treatment with Wed or caspase-11 siRNA significantly mitigated renal fibrosis in UUO mice, evidenced by the improved histological changes. Furthermore, caspase-11 inhibition significantly blunted caspase-1 activation, IL-1β maturation, transforming growth factor-β (TGF-β), fibronectin, and collagen I expressions in the obstructed kidney. Renal tubular epithelial NRK-52E cells were treated in vitro with angiotensin (Ang, 1 μmol/L), which stimulated caspase-11 activation and IL-1β maturation. Treatment with IL-1β (20 ng/ml) significantly increased the expression of TGF-β, fibronectin, and collagen I in the cells. Ang II-induced expression of TGF-β, fibronectin, and collagen I were suppressed by caspase-11 siRNA or Wed. Finally, we revealed using co-immunoprecipitation that caspase-11 was able to interact with caspase-1 in NRK-52E cells. These results suggest that caspase-11 is involved in UUO-induced renal fibrosis. Elevation of caspase-11 in the obstructed kidney promotes renal fibrosis by stimulating caspase-1 activation and IL-1β maturation.
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6
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Yang Q, Wang L, He J, Yang Z, Huang X. Direct imaging of how lanthanides break the normal evolution of plants. J Inorg Biochem 2018; 182:158-169. [PMID: 29482161 DOI: 10.1016/j.jinorgbio.2018.01.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 01/09/2018] [Accepted: 01/30/2018] [Indexed: 10/18/2022]
Abstract
After rare earth elements [REE(III)] are anchored outside of the plasma membrane, REE(III) break plant evolution to initiate leaf cell endocytosis, which finally affects plant growth. However, the molecule for anchoring REE(III) in the acidic environment outside of the plasma membrane is not clear, which is crucial for exploring the mechanism of REE(III) breaking plant evolution. Here, lanthanum(III) [La(III)] and terbium(III) [Tb(III)] were respectively served as a representative of REE(III) without and with f electrons, and Arabidopsis was served as a representative of plants, cellular and molecular basis for arabinogalactan proteins (AGP) anchoring REE(III) outside of the plasma membrane was investigated. By using interdisciplinary methods, when REE(III) initiated leaf cell phagocytosis, we observed the increase in the expression of AGP and their migration to the outside of the plasma membrane. In the acidic environment outside of the plasma membrane, Tb(III) formed more stable Lewis acid-base [REE(III)-AGP] complexes with a higher apparent binding constant (1.51 × 10-6) than La(III) (1.24 × 10-6). In REE(III)-AGP complexes, the bond lengths of REE(III)-O were in normal range and H-bonds were strong H-bonds. The formation of REE(III)-AGP complexes sequentially disturbed the secondary and tertiary structure of AGP, which were enhanced with increasing the concentration of REE(III), and Tb(III) caused stronger structural changes than La(III). Hence, AGP could be molecules for anchoring REE(III) outside of the plasma membrane. The results of this study are direct imaging of how lanthanides break the normal evolution of plants, and can serve as an important guidance for investigating mechanism of lanthanides in organisms.
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Affiliation(s)
- Qing Yang
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Lihong Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Jingfang He
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Zhenbiao Yang
- Center for Plant Cell Biology, Institute for Integrative Genome Biology, University of California, Riverside, CA 92521, USA
| | - Xiaohua Huang
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Sciences, Nanjing Normal University, Nanjing 210046, China.
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7
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Hermanns HM, Wohlfahrt J, Mais C, Hergovits S, Jahn D, Geier A. Endocytosis of pro-inflammatory cytokine receptors and its relevance for signal transduction. Biol Chem 2017; 397:695-708. [PMID: 27071147 DOI: 10.1515/hsz-2015-0277] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 04/04/2016] [Indexed: 12/14/2022]
Abstract
The pro-inflammatory cytokines tumor necrosis factor (TNF), interleukin-1 (IL-1) and interleukin-6 (IL-6) are key players of the innate and adaptive immunity. Their activity needs to be tightly controlled to allow the initiation of an appropriate immune response as defense mechanism against pathogens or tissue injury. Excessive or sustained signaling of either of these cytokines leads to severe diseases, including rheumatoid arthritis, inflammatory bowel diseases (Crohn's disease, ulcerative colitis), steatohepatitis, periodic fevers and even cancer. Studies carried out in the last 30 years have emphasized that an elaborate control system for each of these cytokines exists. Here, we summarize what is currently known about the involvement of receptor endocytosis in the regulation of these pro-inflammatory cytokines' signaling cascades. Particularly in the last few years it was shown that this cellular process is far more than a mere feedback mechanism to clear cytokines from the circulation and to shut off their signal transduction.
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8
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Endocytic regulation of cytokine receptor signaling. Cytokine Growth Factor Rev 2016; 32:63-73. [DOI: 10.1016/j.cytogfr.2016.07.002] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/13/2016] [Indexed: 12/11/2022]
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9
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Windheim M. Interleukin-1-induced gene expression requires the membrane-raft-dependent internalization of the interleukin-1 receptor. Cell Signal 2016; 28:1520-9. [PMID: 27327966 DOI: 10.1016/j.cellsig.2016.06.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 06/16/2016] [Accepted: 06/16/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Mark Windheim
- Institute of Biochemistry, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.
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10
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Li X, Huang W, Gu J, Du X, Lei L, Yuan X, Sun G, Wang Z, Li X, Liu G. SREBP-1c overactivates ROS-mediated hepatic NF-κB inflammatory pathway in dairy cows with fatty liver. Cell Signal 2015; 27:2099-109. [PMID: 26189441 DOI: 10.1016/j.cellsig.2015.07.011] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 07/15/2015] [Accepted: 07/15/2015] [Indexed: 01/04/2023]
Abstract
Dairy cows with fatty liver are characterized by hepatic lipid accumulation and a severe inflammatory response. Sterol receptor element binding protein-1c (SREBP-1c) and nuclear factor κB (NF-κB) are components of the main pathways for controlling triglyceride (TG) accumulation and inflammatory levels, respectively. A previous study demonstrated that hepatic inflammatory levels are positively correlated with hepatic TG content. We therefore speculated that SREBP-1c might play an important role in the overactivation of the hepatic NF-κB inflammatory pathway in cows with fatty liver. Compared with healthy cows, cows with fatty liver exhibited severe hepatic injury and high blood concentrations of the inflammatory cytokines TNF-α, IL-6 and IL-1β. Hepatic SREBP-1c-mediated lipid synthesis and the NF-κB inflammatory pathway were both overinduced in cows with fatty liver. In vitro, treatment with non-esterified fatty acids (NEFA) further increased SREBP-1c expression and NF-κB pathway activation, which then promoted TG and inflammatory cytokine synthesis. SREBP-1c overexpression overactivated the NF-κB inflammatory pathway in hepatocytes by increasing ROS content and not through TLR4. Furthermore, SREBP-1c silencing decreased ROS content and further attenuated the activation of the NEFA-induced NF-κB pathway, thereby decreasing TNF-α, IL-6 and IL-1β synthesis. SREBP-1c-overexpressing mice exhibited hepatic steatosis and an overinduced hepatic NF-κB pathway. Taken together, these results indicate that SREBP-1c enhances the NEFA-induced overactivation of the NF-κB inflammatory pathway by increasing ROS in cow hepatocytes, thereby further increasing hepatic inflammatory injury in cows with fatty liver.
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Affiliation(s)
- Xinwei Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Weikun Huang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Jingmin Gu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Xiliang Du
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Lin Lei
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Xue Yuan
- College of Animal Science and Technology, Inner Mongolia National University, Tongliao 028042, China
| | - Guoquan Sun
- College of Animal Science and Technology, Inner Mongolia National University, Tongliao 028042, China
| | - Zhe Wang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China
| | - Xiaobing Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China.
| | - Guowen Liu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, 5333 Xi'an Road, Changchun, 130062 Jilin, China.
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Khaidakov M, Mercanti F, Wang X, Ding Z, Dai Y, Romeo F, Sawamura T, Mehta JL. Prevention of export of anoxia/reoxygenation injury from ischemic to nonischemic cardiomyocytes via inhibition of endocytosis. Am J Physiol Heart Circ Physiol 2014; 306:H1700-7. [PMID: 24778168 DOI: 10.1152/ajpheart.00043.2014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Myocardial infarct size is determined by the death of nonischemic border zone cardiomyocytes caused by export of injury signals from the infarct zone. The countermeasures to limit infarct size, therefore, should be aimed at nonselective blockade of most, if not all, injury signals from entering nonischemic cells. To test whether inhibition of endocytosis might limit infarct size, HL-1 cardiomyocytes were subjected to anoxia (6 h) and reoxygenation (1 h). Anoxic and reoxygenated cells showed a multifold increase in mitochondrial ROS production accompanied with upregulation of scavenger receptors lectin-like oxidized low-density lipoprotein receptor-1 and CD36 and stimulation of stress signals, including NADPH oxidase subunit p22(phox), SOD2, and beclin-1. Incubation of healthy cardiomyocytes in media from anoxic and reoxygenated cells (conditioned media) resulted in qualitatively similar responses, including increase in the generation of mitochondrial ROS, p22(phox), SOD2, and beclin-1. Anoxia and reoxygenation caused collapse of clathrin-mediated endocytosis and stimulation of macropinocytosis, whereas in cultures exposed to conditioned media, the activity of endocytosis was uniformly higher. Conditioned media also significantly aggravated cytotoxic effects of TNF-α and angiotensin II, and suppression of endocytosis reversed these trends, resulting in an overall increase of metabolic activity. Moreover, inhibition of endocytosis prevented binding of oxidized cellular fragments with greater efficiency than targeted neutralization of the scavenger receptor lectin-like oxidized low-density lipoprotein receptor-1. Many of the observations in HL-1 cardiomyocytes were confirmed in primary cardiomyocyte cultures. Our data suggest that endocytosis is upregulated in border zone cardiomyocytes, and inhibition of endocytosis may be an effective approach to prevent export of injury signals from the infarct zone.
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Affiliation(s)
- Magomed Khaidakov
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas;
| | - Federico Mercanti
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas; Division of Cardiology, Department of Internal Medicine, University of Rome "Tor Vergata," Rome, Italy; and
| | - Xianwei Wang
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Zufeng Ding
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Yao Dai
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Francesco Romeo
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas; Division of Cardiology, Department of Internal Medicine, University of Rome "Tor Vergata," Rome, Italy; and
| | - Tatsuya Sawamura
- Department of Vascular Physiology, National Cardiovascular Center Research Institute, Osaka, Japan
| | - Jawahar L Mehta
- Central Arkansas Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas
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Interleukin-1-induced activation of the small GTPase Rac1 depends on receptor internalization and regulates gene expression. Cell Signal 2014; 26:49-55. [DOI: 10.1016/j.cellsig.2013.09.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 09/19/2013] [Accepted: 09/19/2013] [Indexed: 11/19/2022]
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