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Guo P, Hu S, Liu X, He M, Li J, Ma T, Huang M, Fang Q, Wang Y. CAV3 alleviates diabetic cardiomyopathy via inhibiting NDUFA10-mediated mitochondrial dysfunction. J Transl Med 2024; 22:390. [PMID: 38671439 PMCID: PMC11055322 DOI: 10.1186/s12967-024-05223-6] [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: 01/31/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND The progression of diabetic cardiomyopathy (DCM) is noticeably influenced by mitochondrial dysfunction. Variants of caveolin 3 (CAV3) play important roles in cardiovascular diseases. However, the potential roles of CAV3 in mitochondrial function in DCM and the related mechanisms have not yet been elucidated. METHODS Cardiomyocytes were cultured under high-glucose and high-fat (HGHF) conditions in vitro, and db/db mice were employed as a diabetes model in vivo. To investigate the role of CAV3 in DCM and to elucidate the molecular mechanisms underlying its involvement in mitochondrial function, we conducted Liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis and functional experiments. RESULTS Our findings demonstrated significant downregulation of CAV3 in the cardiac tissue of db/db mice, which was found to be associated with cardiomyocyte apoptosis in DCM. Importantly, cardiac-specific overexpression of CAV3 effectively inhibited the progression of DCM, as it protected against cardiac dysfunction and cardiac remodeling associated by alleviating cardiomyocyte mitochondrial dysfunction. Furthermore, mass spectrometry analysis and immunoprecipitation assays indicated that CAV3 interacted with NDUFA10, a subunit of mitochondrial complex I. CAV3 overexpression reduced the degradation of lysosomal pathway in NDUFA10, restored the activity of mitochondrial complex I and improved mitochondrial function. Finally, our study demonstrated that CAV3 overexpression restored mitochondrial function and subsequently alleviated DCM partially through NDUFA10. CONCLUSIONS The current study provides evidence that CAV3 expression is significantly downregulated in DCM. Upregulation of CAV3 interacts with NDUFA10, inhibits the degradation of lysosomal pathway in NDUFA10, a subunit of mitochondrial complex I, restores the activity of mitochondrial complex I, ameliorates mitochondrial dysfunction, and thereby protects against DCM. These findings indicate that targeting CAV3 may be a promising approach for the treatment of DCM.
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Affiliation(s)
- Ping Guo
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Shuiqing Hu
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Xiaohui Liu
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Miaomiao He
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Jie Li
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Tingqiong Ma
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Man Huang
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China
| | - Qin Fang
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China.
| | - Yan Wang
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, 430030, China.
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2
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Zhao X, Yang X, An Z, Liu L, Yong J, Xing H, Huang R, Tian J, Song X. Pathophysiology and molecular mechanism of caveolin involved in myocardial protection strategies in ischemic conditioning. Biomed Pharmacother 2022; 153:113282. [PMID: 35750009 DOI: 10.1016/j.biopha.2022.113282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/30/2022] [Accepted: 06/08/2022] [Indexed: 11/02/2022] Open
Abstract
Multiple pathophysiological pathways are activated during the process of myocardial injury. Various cardioprotective strategies protect the myocardium from ischemia, infarction, and ischemia/reperfusion (I/R) injury through different targets, yet the clinical translation remains limited. Caveolae and its structure protein, caveolins, have been suggested as a bridge to transmit damage-preventing signals and mediate the protection of ultrastructure in cardiomyocytes under pathological conditions. In this review, we first briefly introduce caveolae and caveolins. Then we review the cardioprotective strategies mediated by caveolins through various pathophysiological pathways. Finally, some possible research directions are proposed to provide future experiments and clinical translation perspectives targeting caveolin based on the investigative evidence.
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Affiliation(s)
- Xin Zhao
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Xueyao Yang
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Ziyu An
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Libo Liu
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Jingwen Yong
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Haoran Xing
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China
| | - Rongchong Huang
- Department of Cardiology, Beijing Friendship Hospital, Capital Medical University, 95th Yong An Road, Xuan Wu District, Beijing 100050, PR China
| | - Jinfan Tian
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China.
| | - Xiantao Song
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, 2 Anzhen Road, Beijing 100029, PR China.
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3
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Unconventional roles for membrane traffic proteins in response to muscle membrane stress. Curr Opin Cell Biol 2020; 65:42-49. [DOI: 10.1016/j.ceb.2020.02.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 02/10/2020] [Accepted: 02/15/2020] [Indexed: 12/19/2022]
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4
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Keshavarz M, Skill M, Hollenhorst MI, Maxeiner S, Walecki M, Pfeil U, Kummer W, Krasteva-Christ G. Caveolin-3 differentially orchestrates cholinergic and serotonergic constriction of murine airways. Sci Rep 2018; 8:7508. [PMID: 29760450 PMCID: PMC5951923 DOI: 10.1038/s41598-018-25445-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 04/16/2018] [Indexed: 01/22/2023] Open
Abstract
The mechanisms of controlling airway smooth muscle (ASM) tone are of utmost clinical importance as inappropriate constriction is a hallmark in asthma and chronic obstructive pulmonary disease. Receptors for acetylcholine and serotonin, two relevant mediators in this context, appear to be incorporated in specialized, cholesterol-rich domains of the plasma membrane, termed caveolae due to their invaginated shape. The structural protein caveolin-1 partly accounts for anchoring of these receptors. We here determined the role of the other major caveolar protein, caveolin-3 (cav-3), in orchestrating cholinergic and serotonergic ASM responses, utilizing newly generated cav-3 deficient mice. Cav-3 deficiency fully abrogated serotonin-induced constriction of extrapulmonary airways in organ baths while leaving intrapulmonary airways unaffected, as assessed in precision cut lung slices. The selective expression of cav-3 in tracheal, but not intrapulmonary bronchial epithelial cells, revealed by immunohistochemistry, might explain the differential effects of cav-3 deficiency on serotonergic ASM constriction. The cholinergic response of extrapulmonary airways was not altered, whereas a considerable increase was observed in cav-3-/- intrapulmonary bronchi. Thus, cav-3 differentially organizes serotonergic and cholinergic signaling in ASM through mechanisms that are specific for airways of certain caliber and anatomical position. This may allow for selective and site-specific intervention in hyperreactive states.
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Affiliation(s)
- M Keshavarz
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - M Skill
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - M I Hollenhorst
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany
| | - S Maxeiner
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany
| | - M Walecki
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - U Pfeil
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - W Kummer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany.,German Center for Lung Research (DZL), Marburg, Germany
| | - G Krasteva-Christ
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany. .,German Center for Lung Research (DZL), Marburg, Germany. .,Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany.
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5
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Bai Y, Wu J, Li D, Morgan EE, Liu J, Zhao X, Walsh A, Saikumar J, Tinkel J, Joe B, Gupta R, Liu L. Differential roles of caveolin-1 in ouabain-induced Na+/K+-ATPase cardiac signaling and contractility. Physiol Genomics 2016; 48:739-748. [PMID: 27519543 PMCID: PMC5243228 DOI: 10.1152/physiolgenomics.00042.2016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 08/03/2016] [Indexed: 11/22/2022] Open
Abstract
Binding of ouabain to cardiac Na+/K+-ATPase initiates cell signaling and causes contractility in cardiomyocytes. It is widely accepted that caveolins, structural proteins of caveolae, have been implicated in signal transduction. It is known that caveolae play a role in Na+/K+-ATPase functions. Regulation of caveolin-1 in ouabain-mediated cardiac signaling and contractility has never been reported. The aim of this study is to compare ouabain-induced cardiac signaling and contractility in wild-type (WT) and caveolin-1 knockout (cav-1 KO) mice. In contrast with WT cardiomyocytes, ouabain-induced signaling e.g., activation of phosphoinositide 3-kinase-α/Akt and extracellular signal-regulated kinases (ERK)1/2, and hypertrophic growth were significantly reduced in cav-1 KO cardiomyocytes. Interactions of the Na+/K+-ATPase α1-subunit with caveolin-3 and the Na+/K+-ATPase α1-subunit with PI3K-α were also decreased in cav-1 KO cardiomyocytes. The results from cav-1 KO mouse embryonic fibroblasts also proved that cav-1 significantly attenuated ouabain-induced ERK1/2 activation without alteration in protein and cholesterol distribution in caveolae/lipid rafts. Intriguingly, the effect of ouabain induced positive inotropy in vivo (via transient infusion of ouabain, 0.48 nmol/g body wt) was not attenuated in cav-1 KO mice. Furthermore, ouabain (1-100 μM) induced dose-dependent contractility in isolated working hearts from WT and cav-1 KO mice. The effects of ouabain on contractility between WT and cav-1 KO mice were not significantly different. These results demonstrated differential roles of cav-1 in the regulation of ouabain signaling and contractility. Signaling by ouabain, in contrast to contractility, may be a redundant property of Na+/K+-ATPase.
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Affiliation(s)
- Yan Bai
- Department of Biochemistry and Cancer Biology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio; Pediatrics Department of Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Jian Wu
- Department of Biochemistry and Cancer Biology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Daxiang Li
- Department of Biochemistry and Cancer Biology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio; State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, Anhui, China; and
| | - Eric E Morgan
- Center for Hypertension and Personalized Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Jiang Liu
- Department of Pharmacology, Physiology and Toxicology, JCE School of Medicine, Marshall University, Huntington, West Virginia
| | - Xiaochen Zhao
- Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Aaron Walsh
- Department of Biochemistry and Cancer Biology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Jagannath Saikumar
- Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Jodi Tinkel
- Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Bina Joe
- Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio; Center for Hypertension and Personalized Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Rajesh Gupta
- Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio
| | - Lijun Liu
- Department of Biochemistry and Cancer Biology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio; Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio; Center for Hypertension and Personalized Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio;
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6
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Tang Z, Yang Y, Wang Z, Zhao S, Mu Y, Li K. Integrated analysis of miRNA and mRNA paired expression profiling of prenatal skeletal muscle development in three genotype pigs. Sci Rep 2015; 5:15544. [PMID: 26496978 PMCID: PMC4620456 DOI: 10.1038/srep15544] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Accepted: 09/28/2015] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs (miRNAs) play a vital role in muscle development by binding to messenger RNAs (mRNAs). Based on prenatal skeletal muscle at 33, 65 and 90 days post-coitus (dpc) from Landrace, Tongcheng and Wuzhishan pigs, we carried out integrated analysis of miRNA and mRNA expression profiling. We identified 33, 18 and 67 differentially expressed miRNAs and 290, 91 and 502 mRNA targets in Landrace, Tongcheng and Wuzhishan pigs, respectively. Subsequently, 12 mRNAs and 3 miRNAs differentially expressed were validated using quantitative real-time PCR (qPCR), and 5 predicted miRNA targets were confirmed via dual luciferase reporter or western blot assays. We identified a set of miRNAs and mRNA genes differentially expressed in muscle development. Gene ontology (GO) enrichment analysis suggests that the miRNA targets are primarily involved in muscle contraction, muscle development and negative regulation of cell proliferation. Our data indicated that more mRNAs are regulated by miRNAs at earlier stages than at later stages of muscle development. Landrace and Tongcheng pigs also had longer phases of myoblast proliferation than Wuzhishan pigs. This study will be helpful to further explore miRNA-mRNA interactions in myogenesis and aid to uncover the molecular mechanisms of muscle development and phenotype variance in pigs.
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Affiliation(s)
- Zhonglin Tang
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China
| | - Yalan Yang
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China
| | - Zishuai Wang
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Shuanping Zhao
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Institute of Animal Science, Anhui Academy of Agricultural Sciences, Hefei, 230031, P. R. China
| | - Yulian Mu
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Kui Li
- The State Key Laboratory for Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.,Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China
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7
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Conde-Perez A, Gros G, Longvert C, Pedersen M, Petit V, Aktary Z, Viros A, Gesbert F, Delmas V, Rambow F, Bastian BC, Campbell AD, Colombo S, Puig I, Bellacosa A, Sansom O, Marais R, Van Kempen LCLT, Larue L. A caveolin-dependent and PI3K/AKT-independent role of PTEN in β-catenin transcriptional activity. Nat Commun 2015; 6:8093. [PMID: 26307673 PMCID: PMC4560817 DOI: 10.1038/ncomms9093] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 07/16/2015] [Indexed: 12/22/2022] Open
Abstract
Loss of the tumour suppressor PTEN is frequent in human melanoma, results in MAPK activation, suppresses senescence and mediates metastatic behaviour. How PTEN loss mediates these effects is unknown. Here we show that loss of PTEN in epithelial and melanocytic cell lines induces the nuclear localization and transcriptional activation of β-catenin independent of the PI3K-AKT-GSK3β axis. The absence of PTEN leads to caveolin-1 (CAV1)-dependent β-catenin transcriptional modulation in vitro, cooperates with NRAS(Q61K) to initiate melanomagenesis in vivo and induces efficient metastasis formation associated with E-cadherin internalization. The CAV1-β-catenin axis is mediated by a feedback loop in which β-catenin represses transcription of miR-199a-5p and miR-203, which suppress the levels of CAV1 mRNA in melanoma cells. These data reveal a mechanism by which loss of PTEN increases CAV1-mediated dissociation of β-catenin from membranous E-cadherin, which may promote senescence bypass and metastasis.
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Affiliation(s)
- Alejandro Conde-Perez
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Gwendoline Gros
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Christine Longvert
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Malin Pedersen
- Targeted Therapy Team, The Institute of Cancer Research, 237 Fulham Road, London SW3 6JB, UK
| | - Valérie Petit
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Zackie Aktary
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Amaya Viros
- Molecular Oncology Group, Cancer Research UK Manchester Institute, The University of Manchester, Wilmslow Road, Manchester M20 4BX, UK
| | - Franck Gesbert
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Véronique Delmas
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Florian Rambow
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Boris C Bastian
- Departments of Dermatology and Pathology and UCSF Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94143, USA
| | | | - Sophie Colombo
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | - Isabel Puig
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
| | | | - Owen Sansom
- The Beatson Institute for Cancer Research, Glasgow G61 1BD, UK
| | - Richard Marais
- Molecular Oncology Group, Cancer Research UK Manchester Institute, The University of Manchester, Wilmslow Road, Manchester M20 4BX, UK
| | - Leon C L T Van Kempen
- Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen 6500 HB, The Netherlands
- Jewish General Hospital, Lady Davis Institute for Medical Research, Montreal, Quebec QC H3T 1E2, Canada
- Department of Pathology, McGill University, Montreal, Quebec QC H3T 1E2, Canada
| | - Lionel Larue
- Normal and Pathological Development of Melanocytes, Institut Curie, Orsay 91405, France
- CNRS, UMR3347 Bat. 110, Orsay Cedex 91405, France
- INSERM U1021, Orsay Cedex 91405, France
- Equipe labellisée-Ligue Nationale contre le Cancer, Orsay Cedex 91405, France
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8
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Murfitt L, Whiteley G, Iqbal MM, Kitmitto A. Targeting caveolin-3 for the treatment of diabetic cardiomyopathy. Pharmacol Ther 2015; 151:50-71. [PMID: 25779609 DOI: 10.1016/j.pharmthera.2015.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 03/09/2015] [Indexed: 12/21/2022]
Abstract
Diabetes is a global health problem with more than 550 million people predicted to be diabetic by 2030. A major complication of diabetes is cardiovascular disease, which accounts for over two-thirds of mortality and morbidity in diabetic patients. This increased risk has led to the definition of a diabetic cardiomyopathy phenotype characterised by early left ventricular dysfunction with normal ejection fraction. Here we review the aetiology of diabetic cardiomyopathy and explore the involvement of the protein caveolin-3 (Cav3). Cav3 forms part of a complex mechanism regulating insulin signalling and glucose uptake, processes that are impaired in diabetes. Further, Cav3 is key for stabilisation and trafficking of cardiac ion channels to the plasma membrane and so contributes to the cardiac action potential shape and duration. In addition, Cav3 has direct and indirect interactions with proteins involved in excitation-contraction coupling and so has the potential to influence cardiac contractility. Significantly, both impaired contractility and rhythm disturbances are hallmarks of diabetic cardiomyopathy. We review here how changes to Cav3 expression levels and altered relationships with interacting partners may be contributory factors to several of the pathological features identified in diabetic cardiomyopathy. Finally, the review concludes by considering ways in which levels of Cav3 may be manipulated in order to develop novel therapeutic approaches for treating diabetic cardiomyopathy.
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Affiliation(s)
- Lucy Murfitt
- Institute of Cardiovascular Sciences, Faculty of Medical and Human Sciences, University of Manchester, M13 9NT, UK
| | - Gareth Whiteley
- Institute of Cardiovascular Sciences, Faculty of Medical and Human Sciences, University of Manchester, M13 9NT, UK
| | - Mohammad M Iqbal
- Institute of Cardiovascular Sciences, Faculty of Medical and Human Sciences, University of Manchester, M13 9NT, UK
| | - Ashraf Kitmitto
- Institute of Cardiovascular Sciences, Faculty of Medical and Human Sciences, University of Manchester, M13 9NT, UK.
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9
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Low JY, Nicholson HD. Epigenetic modifications of caveolae associated proteins in health and disease. BMC Genet 2015; 16:71. [PMID: 26112043 PMCID: PMC4482180 DOI: 10.1186/s12863-015-0231-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 06/15/2015] [Indexed: 02/06/2023] Open
Abstract
Caveolae are small, “omega-shaped” invaginations at the plasma membrane of the cell which are involved in a variety of processes including cholesterol transport, potocytosis and cell signalling. Within caveolae there are caveolae-associated proteins, and changes in expression of these molecules have been described to play a role in the pathophysiology of various diseases including cancer and cardiovascular disease. Evidence is beginning to accumulate that epigenetic processes may regulate the expression of these caveolae related genes, and hence contribute to disease progression. Here, we summarize the current knowledge of the role of epigenetic modification in regulating the expression of these caveolae related genes and how this relates to changes in cellular physiology and in health and disease.
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Affiliation(s)
- Jin-Yih Low
- Department of Anatomy, Otago School of Medical Sciences, University of Otago, P.O. Box 913, Dunedin, 9054, New Zealand.
| | - Helen D Nicholson
- Department of Anatomy, Otago School of Medical Sciences, University of Otago, P.O. Box 913, Dunedin, 9054, New Zealand.
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10
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Gutierrez-Pajares JL, Iturrieta J, Dulam V, Wang Y, Pavlides S, Malacari G, Lisanti MP, Frank PG. Caveolin-3 Promotes a Vascular Smooth Muscle Contractile Phenotype. Front Cardiovasc Med 2015; 2:27. [PMID: 26664898 PMCID: PMC4671348 DOI: 10.3389/fcvm.2015.00027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/24/2015] [Indexed: 01/12/2023] Open
Abstract
Epidemiological studies have demonstrated the importance of cardiovascular diseases in Western countries. Among the cell types associated with a dysfunctional vasculature, smooth muscle (SM) cells are believed to play an essential role in the development of these illnesses. Vascular SM cells are key regulators of the vascular tone and also have an important function in the development of atherosclerosis and restenosis. While in the normal vasculature, contractile SM cells are predominant, in atherosclerotic vascular lesions, synthetic cells migrate toward the neointima, proliferate, and synthetize extracellular matrix proteins. In the present study, we have examined the role of caveolin-3 in the regulation of SM cell phenotype. Caveolin-3 is expressed in vivo in normal arterial SM cells, but its expression appears to be lost in cultured SM cells. Our data show that caveolin-3 expression in the A7r5 SM cell line is associated with increased expression of contractility markers such as SM α-actin, SM myosin heavy chain but decreased expression of the synthetic phenotype markers such as p-Elk and Klf4. Moreover, we also show that caveolin-3 expression can reduce proliferation upon treatment with LDL or PDGF. Finally, we show that caveolin-3-expressing SM cells are less sensitive to apoptosis than control cells upon treatment with oxidized LDL. Taken together, our data suggest that caveolin-3 can regulate the phenotypic switch between contractile and synthetic SM cells. A better understanding of the factors regulating caveolin-3 expression and function in this cell type will permit the development of a better comprehension of the factors regulating SM function in atherosclerosis and restenosis.
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Affiliation(s)
- Jorge L Gutierrez-Pajares
- Faculté de Médecine, INSERM UMR1069 "Nutrition, Croissance et Cancer", Université François Rabelais de Tours , Tours , France ; Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Jeannette Iturrieta
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Vipin Dulam
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Yu Wang
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Stephanos Pavlides
- The Manchester Centre for Cellular Metabolism (MCCM), Institute of Cancer Sciences, University of Manchester , Manchester , UK ; The Breakthrough Breast Cancer Research Unit, Institute of Cancer Sciences, University of Manchester , Manchester , UK
| | - Gabriella Malacari
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Michael P Lisanti
- The Manchester Centre for Cellular Metabolism (MCCM), Institute of Cancer Sciences, University of Manchester , Manchester , UK ; The Breakthrough Breast Cancer Research Unit, Institute of Cancer Sciences, University of Manchester , Manchester , UK
| | - Philippe G Frank
- Faculté de Médecine, INSERM UMR1069 "Nutrition, Croissance et Cancer", Université François Rabelais de Tours , Tours , France ; Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Biochemistry and Molecular Biology, Thomas Jefferson University , Philadelphia, PA , USA
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11
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Mougeolle A, Poussard S, Decossas M, Lamaze C, Lambert O, Dargelos E. Oxidative stress induces caveolin 1 degradation and impairs caveolae functions in skeletal muscle cells. PLoS One 2015; 10:e0122654. [PMID: 25799323 PMCID: PMC4370508 DOI: 10.1371/journal.pone.0122654] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 02/21/2015] [Indexed: 11/19/2022] Open
Abstract
Increased level of oxidative stress, a major actor of cellular aging, impairs the regenerative capacity of skeletal muscle and leads to the reduction in the number and size of muscle fibers causing sarcopenia. Caveolin 1 is the major component of caveolae, small membrane invaginations involved in signaling and endocytic trafficking. Their role has recently expanded to mechanosensing and to the regulation of oxidative stress-induced pathways. Here, we increased the amount of reactive oxidative species in myoblasts by addition of hydrogen peroxide (H2O2) at non-toxic concentrations. The expression level of caveolin 1 was significantly decreased as early as 10 min after 500 μM H2O2 treatment. This reduction was not observed in the presence of a proteasome inhibitor, suggesting that caveolin 1 was rapidly degraded by the proteasome. In spite of caveolin 1 decrease, caveolae were still able to assemble at the plasma membrane. Their functions however were significantly perturbed by oxidative stress. Endocytosis of a ceramide analog monitored by flow cytometry was significantly diminished after H2O2 treatment, indicating that oxidative stress impaired its selective internalization via caveolae. The contribution of caveolae to the plasma membrane reservoir has been monitored after osmotic cell swelling. H2O2 treatment increased membrane fragility revealing that treated cells were more sensitive to an acute mechanical stress. Altogether, our results indicate that H2O2 decreased caveolin 1 expression and impaired caveolae functions. These data give new insights on age-related deficiencies in skeletal muscle.
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Affiliation(s)
- Alexis Mougeolle
- Univ Bordeaux, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; CNRS, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; Bordeaux INP, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France
| | - Sylvie Poussard
- Univ Bordeaux, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; CNRS, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; Bordeaux INP, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France
| | - Marion Decossas
- Univ Bordeaux, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; CNRS, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; Bordeaux INP, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France
| | - Christophe Lamaze
- Institut Curie—Centre de Recherche, Membrane Dynamics and Mechanics of Intracellular Signaling Team, INSERM U1143, CNRS UMR 3666, Paris, France
| | - Olivier Lambert
- Univ Bordeaux, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; CNRS, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; Bordeaux INP, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France
| | - Elise Dargelos
- Univ Bordeaux, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; CNRS, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France; Bordeaux INP, Chimie et Biologie des Membranes et Nanoobjets, UMR 5248, F-33600 Pessac, France
- * E-mail:
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12
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Schilling JM, Roth DM, Patel HH. Caveolins in cardioprotection - translatability and mechanisms. Br J Pharmacol 2015; 172:2114-25. [PMID: 25377989 DOI: 10.1111/bph.13009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 10/27/2014] [Accepted: 11/03/2014] [Indexed: 12/24/2022] Open
Abstract
Translation of preclinical treatments for ischaemia-reperfusion injury into clinical therapies has been limited by a number of factors. This review will focus on a single mode of cardiac protection related to a membrane scaffolding protein, caveolin, which regulates protective signalling as well as myocyte ultrastructure in the setting of ischaemic stress. Factors that have limited the clinical translation of protection will be considered specifically in terms of signalling and structural defects. The potential of caveolin to overcome barriers to protection with the ultimate hope of clinical translation will be discussed.
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Affiliation(s)
- Jan M Schilling
- VA San Diego Healthcare System, San Diego, CA, USA; Department of Anesthesiology, University of California, San Diego, La Jolla, CA, USA
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13
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Chen F, Barman S, Yu Y, Haigh S, Wang Y, Black SM, Rafikov R, Dou H, Bagi Z, Han W, Su Y, Fulton DJR. Caveolin-1 is a negative regulator of NADPH oxidase-derived reactive oxygen species. Free Radic Biol Med 2014; 73:201-13. [PMID: 24835767 PMCID: PMC4228786 DOI: 10.1016/j.freeradbiomed.2014.04.029] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 04/25/2014] [Accepted: 04/27/2014] [Indexed: 01/14/2023]
Abstract
Changes in the expression and function of caveolin-1 (Cav-1) have been proposed as a pathogenic mechanism underlying many cardiovascular diseases. Cav-1 binds to and regulates the activity of numerous signaling proteins via interactions with its scaffolding domain. In endothelial cells, Cav-1 has been shown to reduce reactive oxygen species (ROS) production, but whether Cav-1 regulates the activity of NADPH oxidases (Noxes), a major source of cellular ROS, has not yet been shown. Herein, we show that Cav-1 is primarily expressed in the endothelium and adventitia of pulmonary arteries (PAs) and that Cav-1 expression is reduced in isolated PAs from multiple models of pulmonary artery hypertension (PH). Reduced Cav-1 expression correlates with increased ROS production in the adventitia of hypertensive PA. In vitro experiments revealed a significant ability of Cav-1 and its scaffolding domain to inhibit Nox1-5 activity and it was also found that Cav-1 binds to Nox5 and Nox2 but not Nox4. In addition to posttranslational actions, in primary cells, Cav-1 represses the mRNA and protein expression of Nox2 and Nox4 through inhibition of the NF-κB pathway. Last, in a mouse hypoxia model, the genetic ablation of Cav-1 increased the expression of Nox2 and Nox4 and exacerbated PH. Together, these results suggest that Cav-1 is a negative regulator of Nox function via two distinct mechanisms, acutely through direct binding and chronically through alteration of expression levels. Accordingly, the loss of Cav-1 expression in cardiovascular diseases such as PH may account for the increased Nox activity and greater production of ROS.
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Affiliation(s)
- Feng Chen
- Department of Forensic Medicine, Nanjing Medical University, Nanjing, Jiangsu 210029, China; Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA.
| | - Scott Barman
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, USA
| | - Yanfang Yu
- Department of Forensic Medicine, Nanjing Medical University, Nanjing, Jiangsu 210029, China; Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA
| | - Steven Haigh
- Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA
| | - Yusi Wang
- Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA
| | | | | | | | - Zsolt Bagi
- Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA
| | - Weihong Han
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, USA
| | - Yunchao Su
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, USA
| | - David J R Fulton
- Vascular Biology Center and Georgia Regents University, Augusta, GA 30912, USA; Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, USA.
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14
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Rusu MC, Loreto C, Mănoiu VS. Network of telocytes in the temporomandibular joint disc of rats. Acta Histochem 2014; 116:663-8. [PMID: 24439756 DOI: 10.1016/j.acthis.2013.12.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 12/05/2013] [Accepted: 12/08/2013] [Indexed: 02/03/2023]
Abstract
The phenotypes of the temporomandibular joint (TMJ) disc cells range from fibroblasts to chondrocytes. There are relatively few reported studies using transmission electron microscopy (TEM) to determine the ultrastructural features of these cells. It was hypothesized that at least a subpopulation of TMJ stromal cells could be represented by the telocytes, cells with telopodes. In this regard a TEM study was performed on rat TMJ samples. Collagen-embedded networks were found built-up by cells with telopodes with subplasmalemmal caveolae, moderate content in matrix secretory organelles and well-represented intermediate filaments. Appositions of cell bodies were found. Prolongations of such cells were closely related to nerves and microvessels. Our study indicates that the TMJ disc attachment seems equipped with telocytes capable of stromal signaling. However, further studies are needed to assess whether the telocytes belong to a renewed cell population derived from circulating precursors.
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15
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Cav1 suppresses tumor growth and metastasis in a murine model of cutaneous SCC through modulation of MAPK/AP-1 activation. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 182:992-1004. [PMID: 23267770 DOI: 10.1016/j.ajpath.2012.11.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 10/03/2012] [Accepted: 11/08/2012] [Indexed: 01/17/2023]
Abstract
Caveolin-1 (Cav1) is a scaffolding protein that serves to regulate the activity of several signaling molecules. Its loss has been implicated in the pathogenesis of several types of cancer, but its role in the development and progression of cutaneous squamous cell carcinoma (cSCC) remains largely unexplored. Herein, we use the keratinocyte cell line PAM212, a murine model of cSCC, to determine the function of Cav1 in skin tumor biology. We first show that Cav1 overexpression decreases cell and tumor growth, whereas Cav1 knockdown increases these attributes in PAM212 cells. In addition, Cav1 knockdown increases the invasive ability and incidence of spontaneous lymph node metastasis. Finally, we demonstrate that Cav1 knockdown increases extracellular signaling-related kinase 1/2 mitogen-activated protein kinase/activator protein-1 pathway activation. We attribute the growth and invasive advantage conferred by Cav1 knockdown to increased expression of activator protein-1 transcriptional targets, including cyclin D1 and keratin 18, which show inverse expression in PAM212 based on the expression level of Cav1. In summary, we demonstrate that loss of Cav1 affects several characteristics associated with aggressive human skin tumors and that this protein may be an important modulator of tumor growth and invasion in cSCC.
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16
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Suzuki Y, Yamamura H, Ohya S, Imaizumi Y. Direct molecular interaction of caveolin-3 with KCa1.1 channel in living HEK293 cell expression system. Biochem Biophys Res Commun 2012; 430:1169-74. [PMID: 23237801 DOI: 10.1016/j.bbrc.2012.12.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Accepted: 12/05/2012] [Indexed: 12/21/2022]
Abstract
Caveolin family is supposed to be essential molecules for the formation of not only caveola structure on cell membrane but also functional molecular complexes in them with direct and/or indirect interaction with other membrane and/or submembrane associated proteins. The direct coupling of caveolin-1 (cav1) with large conductance Ca(2+)-activated K(+) channel, KCa1.1 has been established in several types of cells and in expression system as well. The possible interaction of caveolin-3 (cav3), which shows expression in some differential tissues from cav1, with KCa1.1 remains to be determined. In the present study, the density of KCa1.1 current expressed in HEK293 cells was significantly reduced by the co-expression of cav3, as well as cav1. The co-localization and direct interaction of GFP- or CFP-labeled cav3 (GFP/CFP-cav3) with YFP- or mCherry-labeled KCa1.1 (KCa1.1-YFP/mCherry) were clearly demonstrated by single molecular image analyses using total internal reflection fluorescence (TIRF) microscopy and fluorescence resonance energy transfer (FRET) analyses with acceptor photobleaching method. The deletion of suggested cav1-binding motif in C terminus region of KCa1.1 (KCa1.1ΔCB-YFP) resulted in the marked decrease in cell surface expression, co-localization and FRET efficiency with CFP-cav3 and CFP-cav1. The FLAG-KCa1.1 co-immunoprecipitation with GFP-cav3 or GFP-cav1 also supported their direct molecular interaction. These results strongly suggest that cav3 possesses direct interaction with KCa1.1, presumably at the same domain for cav1 binding. This interaction regulates KCa1.1 expression to cell surface and the formation of functional molecular complex in caveolae in living cells.
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Affiliation(s)
- Yoshiaki Suzuki
- Department of Molecular & Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
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17
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Abstract
Caveolae are omega-shaped membrane invaginations present in essentially all cell types of the cardiovascular system, including endothelial cells, smooth muscle cells, macrophages, cardiac myocytes, and fibroblasts. Numerous functions have been ascribed to this omega-shaped structure. Caveolae are enriched with different signaling molecules and ion channel regulatory proteins and function both in protein trafficking and signal transduction in these cell types. Caveolins are the structural proteins that are necessary for the formation of caveola membrane domains. Mechanistically, caveolins interact with a variety of downstream signaling molecules, as, for example, Src-family tyrosine kinase, p42/44 mitogen-activated protein (MAP) kinase, and endothelial nitric oxide synthase (eNOS) and hold the signal transducers in the inactive condition until activated with proper stimulus. Caveolae are gradually acquiring increasing attention as cellular organelles contributing to the pathogenesis of several structural and functional processes including cardiac hypertrophy, atherosclerosis, and heart failure. At present, very little is known about the role of caveolae in cardiac function and dysfunction, although recent studies with caveolin knock-out mouse have shown that caveolae and caveolins play a pivotal role in various human pathobiological conditions. This review will discuss the possible role and mechanism of action of caveolae and caveolins in different cardiac diseases.
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Affiliation(s)
- Manika Das
- Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, CT 06030-1110, USA
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18
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Sullivan MP, Cristofaro V, Radisavljevic ZM, Yalla SV. Regional distribution and molecular interaction of caveolins in bladder smooth muscle. BJU Int 2012; 110:E1163-72. [PMID: 22897417 DOI: 10.1111/j.1464-410x.2012.11410.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
UNLABELLED What's known on the subject? and What does the study add? Caveolae are specialised regions of bladder smooth muscle (BSM) cell membranes where specific signalling pathways are regulated. Caveolin proteins are involved in caveolar biogenesis and function as signal transduction regulators. Expression of caveolin-1, -2, and -3 has been previously identified in the bladder; however, the distribution and relative expression of these proteins have not been defined. The present data show significant differences in the spatial distribution of caveolin proteins throughout the bladder wall. Region dependent variations in the co-localisation of caveolin subtypes in detrusor SM were also detected. These findings support the premise that the unique spatial pattern of caveolin proteins associated with BSM cells may enable regionally distinct functional responses to common stimuli. OBJECTIVE • To determine the regional expression profile of caveolin isoforms (integral membrane proteins abundant in caveolae), the spatial relationships among caveolin proteins within specific smooth muscle (SM) regions and the extent of their molecular interactions in bladder SM (BSM). MATERIALS AND METHODS • Regional differences in the expression of caveolin family members were determined by quantitative reverse transcriptase-polymerase chain reaction and Western blot of RNA and protein extracted from the base, body and dome of rat bladders. • To evaluate the distribution of caveolin-1 (Cav-1), Cav-2 and Cav-3 within the bladder, longitudinal tissue sections from the base to dome were processed for confocal microscopy and quantified for intensity of immunoreactivity (IR) and extent of co-localisation. • Interactions among Cav-1, Cav-2 and Cav-3 were determined by co-immunoprecipitation. RESULTS • Differential expression of Cav-1 and Cav-3 was detected among bladder regions, with lowest expression in the bladder base relative to the dome. • Cav-1 was highly expressed in all regions, although an increase in IR from submucosa to serosa was detected in each region. • The distribution of Cav-2 IR generally paralleled Cav-1, but progressively decreased from submucosa to serosa in each region. • Cav-3 expression predominated in the medial region of BSM increasing progressively from base to dome, but was poorly expressed in the outer SM layer particularly in the dome. • Cav-1 co-precipitated extensively with both Cav-2 and Cav-3. Co-precipitation between Cav-3 and Cav-2 was also detected. CONCLUSIONS • The isoform-specific spatial distribution and distinct molecular interactions among caveolins in BSM may contribute to the contractile heterogeneity of BSM cells and facilitate differential modulation of responses to local stimuli. • As BSM caveolae regulate key signalling processes involved in contraction, altered expression of caveolin proteins may generate a regional imbalance in contraction/relaxation responses, thus leading to bladder dysfunction.
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Affiliation(s)
- Maryrose P Sullivan
- Division of Urology, Veterans Affairs Boston Healthcare System, Boston, MA 02132, USA.
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19
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Abstract
Caveolins serve as a platform in plasma membrane associated caveolae to orchestrate various signaling molecules to effectively communicate extracellular signals into the interior of cell. All three types of caveolin, Cav-1, Cav-2 and Cav-3 are expressed throughout the cardiovascular system especially by the major cell types involved including endothelial cells, cardiac myocytes, smooth muscle cells and fibroblasts. The functional significance of caveolins in the cardiovascular system is evidenced by the fact that caveolin loss leads to the development of severe cardiac pathology. Caveolin gene mutations are associated with altered expression of caveolin protein and inherited arrhythmias. Altered levels of caveolins and related downstream signaling molecules in cardiomyopathies validate the integral participation of caveolin in normal cardiac physiology. This chapter will provide an overview of the role caveolins play in cardiovascular disease. Furthering our understanding of the role for caveolins in cardiovascular pathophysiology has the potential to lead to the manipulation of caveolins as novel therapeutic targets.
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20
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Novel insights into the role of caveolin-2 in cell- and tissue-specific signaling and function. Biochem Res Int 2011; 2011:809259. [PMID: 22229094 PMCID: PMC3249596 DOI: 10.1155/2011/809259] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 10/13/2011] [Indexed: 11/28/2022] Open
Abstract
Caveolin-2 is one of the major protein components of cholesterol- and glycosphingolipid-rich flask-shaped invaginations of plasma membrane caveolae. A new body of evidence suggests that caveolin-2 plays an important, and often more direct, role than caveolin-1 in regulating signaling and function in a cell- and tissue type-specific manner. The purpose of this paper is to primarily focus on discussing how these recent discoveries may help better understand the specific contribution of caveolin-2 to lipid raft- and caveolae-regulated cell/tissue-specific signaling and functions.
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21
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Salem AF, Bonuccelli G, Bevilacqua G, Arafat H, Pestell RG, Sotgia F, Lisanti MP. Caveolin-1 promotes pancreatic cancer cell differentiation and restores membranous E-cadherin via suppression of the epithelial-mesenchymal transition. Cell Cycle 2011; 10:3692-700. [PMID: 22041584 DOI: 10.4161/cc.10.21.17895] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Pancreatic cancer is one of the deadliest cancers due to early rapid metastasis and chemoresistance. Recently, epithelial to mesenchymal transition (EMT) was shown to play a key role in the pathogenesis of pancreatic cancer. To understand the role of caveolin-1 (Cav-1) in EMT, we over-expressed Cav-1 in a pancreatic cancer cell line, Panc 10.05, that does not normally express Cav-1. Here, we show that Cav-1 expression in pancreatic cancer cells induces an epithelial phenotype and promotes cell-cell contact, with increased expression of plasma membrane bound E-cadherin and beta-catenin. Mechanistically, Cav-1 induces Snail downregulation and decreased activation of AKT, MAPK and TGF-beta-Smad signaling pathways. In vitro, Cav-1 expression reduces cell migration and invasion, and attenuates doxorubicin-chemoresistance of pancreatic cancer cells. Importantly, in vivo studies revealed that Cav-1 expression greatly suppresses tumor formation in a xenograft model. Most interestingly, Panc/Cav-1 tumors displayed organized nests of differentiated cells that were totally absent in control tumors. Confirming our in vitro results, these nests of differentiated cells showed reexpression of E-cadherin and beta-catenin at the cell membrane. Thus, we provide evidence that Cav-1 functions as a crucial modulator of EMT and cell differentiation in pancreatic cancer.
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Affiliation(s)
- Ahmed F Salem
- Department of Stem Cell Biology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA, USA
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22
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Das M, Das DK. Lipid raft in cardiac health and disease. Curr Cardiol Rev 2011; 5:105-11. [PMID: 20436850 PMCID: PMC2805812 DOI: 10.2174/157340309788166660] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2008] [Revised: 08/25/2008] [Accepted: 08/25/2008] [Indexed: 01/01/2023] Open
Abstract
Lipid rafts are sphingolipid and cholesterol rich micro-domains of the plasma membrane that coordinate and regulate varieties of signaling processes. Lipid rafts are also present in cardiac myocytes and are enriched in signaling molecules and ion channel regulatory proteins. Lipid rafts are receiving increasing attention as cellular organelles contributing to the pathogenesis of several structural and functional processes including cardiac hypertrophy and heart failure. At present, very little is known about the role of lipid rafts in cardiac function and dysfunction. This review will discuss the possible role of lipid rafts in cardiac health and disease.
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Affiliation(s)
- Manika Das
- Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, CT 06030-110, USA
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23
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Inhibition of ganglioside biosynthesis as a novel therapeutic approach in insulin resistance. Handb Exp Pharmacol 2011:165-78. [PMID: 21484572 DOI: 10.1007/978-3-642-17214-4_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A new concept "Life style-related diseases, such as type 2 diabetes, are a membrane microdomain disorder caused by aberrant expression of gangliosides" has arisen. By examining this working hypothesis, we demonstrate the molecular pathogenesis of type 2 diabetes and insulin resistance focusing on the interaction between insulin receptor and gangliosides in microdomains microdomains and propose the new therapeutic strategy "membrane microdomain ortho-signaling therapy".
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24
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Trimmer C, Whitaker-Menezes D, Bonuccelli G, Milliman JN, Daumer KM, Aplin AE, Pestell RG, Sotgia F, Lisanti MP, Capozza F. CAV1 inhibits metastatic potential in melanomas through suppression of the integrin/Src/FAK signaling pathway. Cancer Res 2010; 70:7489-99. [PMID: 20709760 DOI: 10.1158/0008-5472.can-10-0900] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Caveolin-1 (CAV1) is the main structural component of caveolae, which are plasma membrane invaginations that participate in vesicular trafficking and signal transduction events. Although evidence describing the function of CAV1 in several cancer types has recently accumulated, its role in melanoma tumor formation and progression remains poorly explored. Here, by using B16F10 melanoma cells as an experimental system, we directly explore the function of CAV1 in melanoma tumor growth and metastasis. We first show that CAV1 expression promotes proliferation, whereas it suppresses migration and invasion of B16F10 cells in vitro. When orthotopically implanted in the skin of mice, B16F10 cells expressing CAV1 form tumors that are similar in size to their control counterparts. An experimental metastasis assay shows that CAV1 expression suppresses the ability of B16F10 cells to form lung metastases in C57Bl/6 syngeneic mice. Additionally, CAV1 protein and mRNA levels are found to be significantly reduced in human metastatic melanoma cell lines and human tissue from metastatic lesions. Finally, we show that following integrin activation, B16F10 cells expressing CAV1 display reduced expression levels and activity of FAK and Src proteins. Furthermore, CAV1 expression markedly reduces the expression of integrin β(3) in B16F10 melanoma cells. In summary, our findings provide experimental evidence that CAV1 may function as an antimetastatic gene in malignant melanoma.
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Affiliation(s)
- Casey Trimmer
- Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
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Schlenz H, Kummer W, Jositsch G, Wess J, Krasteva G. Muscarinic receptor-mediated bronchoconstriction is coupled to caveolae in murine airways. Am J Physiol Lung Cell Mol Physiol 2009; 298:L626-36. [PMID: 20023174 DOI: 10.1152/ajplung.00261.2009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cholinergic bronchoconstriction is mediated by M(2) and M(3) muscarinic receptors (MR). In heart and urinary bladder, MR are linked to caveolin-1 or -3, the structural proteins of caveolae. Caveolae are cholesterol-rich, omega-shaped invaginations of the plasma membrane. They provide a scaffold for multiple G protein receptors and membrane-bound enzymes, thereby orchestrating signaling into the cell interior. Hence, we hypothesized that airway MR signaling pathways are coupled to caveolae as well. To address this issue, we determined the distribution of caveolin isoforms and MR subtype M2R in murine and human airways and investigated protein-protein associations by fluorescence resonance energy transfer (FRET)-confocal laser scanning microscopy (CLSM) analysis in immunolabeled murine tissue sections. Bronchoconstrictor responses of murine bronchi were recorded in lung-slice preparations before and after caveolae disruption by methyl-β-cyclodextrin, with efficiency of this treatment being validated by electron microscopy. KCl-induced bronchoconstriction was unaffected after treatment, demonstrating functional integrity of the smooth muscle. Caveolae disruption decreased muscarine-induced bronchoconstriction in wild-type and abolished it in M2R(-/-) and M3R(-/-) mice. Thus M2R and M3R signaling pathways require intact caveolae. Furthermore, we identified a presumed skeletal and cardiac myocyte-specific caveolin isoform, caveolin-3, in human and murine bronchial smooth muscle and found it to be associated with M2R in situ. In contrast, M2R was not associated with caveolin-1, despite an in situ association of caveolin-1 and caveolin-3 that was detected. Here, we demonstrated that M2R- and M3R-mediated bronchoconstriction is caveolae-dependent. Since caveolin-3 is directly associated with M2R, we suggest caveolin-3 as novel regulator of M2R-mediated signaling.
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Affiliation(s)
- Heike Schlenz
- Institute of Anatomy and Cell Biology, Excellence Cluster Cardio-Pulmonary System, University of Giessen Lung Center, Justus-Liebig-University Giessen, Germany
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Hayer A, Stoeber M, Bissig C, Helenius A. Biogenesis of caveolae: stepwise assembly of large caveolin and cavin complexes. Traffic 2009; 11:361-82. [PMID: 20070607 DOI: 10.1111/j.1600-0854.2009.01023.x] [Citation(s) in RCA: 195] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We analyzed the assembly of caveolae in CV1 cells by following the fate of newly synthesized caveolin-1 (CAV1), caveolin-2 and polymerase I and transcript release factor (PTRF)/cavin-1 biochemically and using live-cell imaging. Immediately after synthesis in the endoplasmic reticulum (ER), CAV1 assembled into 8S complexes that concentrated in ER exit sites, due to a DXE sequence in the N-terminal domain. The coat protein II (COPII) machinery allowed rapid transport to the Golgi complex. Accumulating in the medial Golgi, the caveolins lost their diffusional mobility, underwent conformational changes, associated with cholesterol, and eventually assembled into 70S complexes. Together with green fluorescent protein-glycosyl-phosphatidylinositol (GFP-GPI), the newly assembled caveolin scaffolds underwent transport to the plasma membrane in vesicular carriers distinct from those containing vesicular stomatitis virus (VSV) G-protein. After arrival, PTRF/cavin-1 was recruited to the caveolar domains over a period of 25 min or longer. PTRF/cavin-1 itself was present in 60S complexes that also formed in the absence of CAV1. Our study showed the existence of two novel large complexes containing caveolar coat components, and identified a hierarchy of events required for caveolae assembly occurring stepwise in three distinct locations--the ER, the Golgi complex and the plasma membrane.
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Affiliation(s)
- Arnold Hayer
- ETH Zurich, Institute of Biochemistry, HPM, 8093 Zurich, Switzerland
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Serra M, Scotlandi K. Caveolins in the development and diseases of musculoskeletal system. Cancer Lett 2009; 284:113-21. [DOI: 10.1016/j.canlet.2009.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 02/06/2009] [Accepted: 02/09/2009] [Indexed: 01/09/2023]
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Immunohistochemical evidence of caveolin-1 expression in the human fetal and neonatal striated muscle and absence in the adult's. Appl Immunohistochem Mol Morphol 2009; 16:267-73. [PMID: 18301242 DOI: 10.1097/pai.0b013e31812e4b0e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Caveolin-1 (Cav-1) is a 22-kd protein, which exerts essential roles in the regulation of cell proliferation and in transmembrane transport processes. It is mainly expressed in adipocytes, smooth muscle, fibroblasts, and endothelial cells. Its expression in striated muscle fibers is controversial. Indeed, most authors have attributed Cav-1 detection in striated muscle to endothelial cells, adipocytes, and fibroblasts secretion. Nonetheless, recent in vitro studies have shown that Cav-1 is expressed in L6 myoblasts and maintained during the differentiation process. In view of this, and, because only one study has heretofore explored Cav-1 expression in human striated muscle, the aim of the present study was to evaluate and to compare Cav-1 immunohistochemical expression in the human striated muscles of fetus, newborn, and adult. DESIGN Samples of skeletal muscles of different sites and of myocardium were taken at autopsy from 13 fetuses and 4 newborns and submitted to the immunohistochemical analysis for Cav-1 together with 10 samples of adult skeletal muscle. RESULTS Myocardial fibers displayed a weak immunoreaction in all samples, from both the newborns and the fetuses, independently of the week of gestation. Conversely, skeletal muscle fibers were only labeled in specimens from fetuses at late gestation and from the newborns, whereas no immunoreaction was evidenced in muscles taken from fetuses at mid-gestation and in the adult samples. CONCLUSIONS This novel and unexpected pattern of Cav-1 expression in human skeletal muscle suggests a role for Cav-1 in terminal differentiation processes, which need to be clarified by further studies.
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Caveolin, GLUT4 and insulin receptor protein content in human arm and leg muscles. Eur J Appl Physiol 2009; 106:173-9. [PMID: 19219452 DOI: 10.1007/s00421-009-1001-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2008] [Indexed: 12/12/2022]
Abstract
Recent evidence suggests that insulin sensitivity is relatively better preserved in arm muscle than in leg muscle in both healthy controls and type 2 DM, based on measurements of basal and insulin-mediated glucose clearance performed simultaneously in the two sets of muscles. It has also been reported that glucose uptake rates are higher in arm compared to leg muscles in the fasted state during normo-insulinaemia. However, the mechanism(s) for this are unknown. Currently, no information is available on the content of glucose transport proteins between arm and leg muscles. Therefore, we compared four proteins, Caveolin-1 (Cav-1), Caveolin-3 (Cav-3), GLUT4, and IR-beta, each of which plays an important role in regulating glucose transport between arm and leg muscles using muscle samples that were obtained from the deltoid (DEL) and vastus lateralis (VAS) of 14 male college pentathlon athletes before and after two swimming trials performed over 100 and 1,500 m. In the present study, we have shown the levels of Cav-1, -3, GLUT4, and IR-beta measured together for the first time in human arm and leg muscles. There was no difference in the levels of these proteins between arm and leg muscles. Cav-3, GLUT4, and IR-beta were unchanged from the resting levels after both exercise trials in DEL, while Cav-1 was increased (17%) at the end of the longer swim trial. In contrast, all measurements of Cav-1, -3, GLUT4, and IR-beta after the 1,500 m swim trial in VAS were increased, by 120, 46, 123, and 60%, respectively. These data imply that there was no functional difference in glucose transport capacity between arm and leg muscles in highly trained pentathlon athletes in the resting state. Although Cav-3, GLUT4, and IR-beta were unchanged from the resting levels at the end of both exercise trials in DEL, all measures, including Cav-1, increased after the 1,500 m swim trial in VAS.
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Chapter 4 The Biology of Caveolae. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2009; 273:117-62. [DOI: 10.1016/s1937-6448(08)01804-2] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Oh YS, Khil LY, Cho KA, Ryu SJ, Ha MK, Cheon GJ, Lee TS, Yoon JW, Jun HS, Park SC. A potential role for skeletal muscle caveolin-1 as an insulin sensitivity modulator in ageing-dependent non-obese type 2 diabetes: studies in a new mouse model. Diabetologia 2008; 51:1025-34. [PMID: 18408913 DOI: 10.1007/s00125-008-0993-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 02/21/2008] [Indexed: 10/22/2022]
Abstract
AIMS/HYPOTHESIS Type 2 diabetes mellitus is a common age-dependent disease. We discovered that male offspring of non-diabetic C57BL/6 and DBA/2 mice, called JYD mice, develop type 2 diabetes when they grow old. JYD mice show characteristics of insulin resistance, hyperglycaemia and hyperinsulinaemia in old age without obesity. We postulated that the mechanism of age-dependent type 2 diabetes in this model relates to caveolin-1 status in skeletal muscle, which appears to regulate insulin sensitivity in the mice. METHODS We compared insulin sensitivity in aged C57BL/6 and JYD mice using glucose and insulin tolerance tests and (18)F-fluorodeoxyglucose positron emission tomography. We also determined insulin signalling molecules and caveolin proteins using western blotting, and altered caveolin-1 levels in skeletal muscle of C57BL/6 and JYD mice using viral vector systems, to examine the effect of this on insulin sensitivity. RESULTS In 30-week-old C57BL/6 and JYD mice, the basal levels of IRS-1, Akt and peroxisome proliferator-activated receptor-gamma decreased, as did insulin-stimulated phosphorylation of Akt and insulin receptor beta. However, caveolin-1 was only increased about twofold in 30-week-old JYD mice as compared with 3-week-old mice, whereas an eightfold increase was seen in C57BL/6 mice. Downregulation of caveolin-1 production in C57BL/6 mice caused severe impairment of glucose and insulin tolerance. Upregulation of caveolin-1 in aged diabetic JYD mice significantly improved insulin sensitivity with a concomitant increase of glucose uptake in the skeletal muscle. CONCLUSIONS/INTERPRETATION The level of skeletal muscle caveolin-1 is correlated with the progression of age-dependent type 2 diabetes in JYD mice.
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Affiliation(s)
- Y S Oh
- Department of Biochemistry and Molecular Biology, Aging and Apoptosis Research Center, Seoul National University College of Medicine, 28 Yungon Dong, Chongno Ku, Seoul 110-799, South Korea
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Kirkham M, Nixon SJ, Howes MT, Abi-Rached L, Wakeham DE, Hanzal-Bayer M, Ferguson C, Hill MM, Fernandez-Rojo M, Brown DA, Hancock JF, Brodsky FM, Parton RG. Evolutionary analysis and molecular dissection of caveola biogenesis. J Cell Sci 2008; 121:2075-86. [PMID: 18505796 DOI: 10.1242/jcs.024588] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Caveolae are an abundant feature of mammalian cells. Integral membrane proteins called caveolins drive the formation of caveolae but the precise mechanisms underlying caveola formation, and the origin of caveolae and caveolins during evolution, are unknown. Systematic evolutionary analysis shows conservation of genes encoding caveolins in metazoans. We provide evidence for extensive and ancient, local and genomic gene duplication, and classify distinct caveolin gene families. Vertebrate caveolin-1 and caveolin-3 isoforms, as well as an invertebrate (Apis mellifera, honeybee) caveolin, all form morphologically identical caveolae in caveolin-1-null mouse cells, demonstrating that caveola formation is a conserved feature of evolutionarily distant caveolins. However, coexpression of flotillin-1 and flotillin-2 did not cause caveola biogenesis in this system. In contrast to the other tested caveolins, C. elegans caveolin is efficiently transported to the plasma membrane but does not generate caveolae, providing evidence of diversity of function in the caveolin gene family. Using C. elegans caveolin as a template to generate hybrid caveolin constructs we now define domains of caveolin required for caveolae biogenesis. These studies lead to a model for caveola formation and novel insights into the evolution of caveolin function.
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Affiliation(s)
- Matthew Kirkham
- Institute for Molecular Bioscience, University of Queensland, Queensland, Brisbane, Australia
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Antonescu CN, Díaz M, Femia G, Planas JV, Klip A. Clathrin-dependent and independent endocytosis of glucose transporter 4 (GLUT4) in myoblasts: regulation by mitochondrial uncoupling. Traffic 2008; 9:1173-90. [PMID: 18435821 DOI: 10.1111/j.1600-0854.2008.00755.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In myocytes and adipocytes, insulin increases glucose transporter 4 (GLUT4) exocytosis by promoting GLUT4 vesicle docking/fusion with the membrane. Less is known about the mechanism and regulation of GLUT4 endocytosis, particularly in myocytes. Here, we show that GLUT4 internalization in L6 myoblasts was inhibited in part by hypertonicity or clathrin heavy chain knockdown and in part by cholesterol depletion. Both strategies had additive effects, abolishing GLUT4 endocytosis. GLUT4 internalization was abrogated by expressing dominant-negative dynamin-2 but unaffected by inhibiting caveolar-dependent endocytosis through syntaxin-6 knockdown or caveolin mutants (which reduced lactosylceramide endocytosis). Insulin did not affect GLUT4 internalization rate or sensitivity to clathrin or cholesterol depletion. In contrast, the mitochondrial uncoupler dinitrophenol (DNP), which like insulin increases surface GLUT4, reduced GLUT4 (but not transferrin) internalization, an effect additive to that of depleting clathrin but not cholesterol. Trout GLUT4 (a natural variant of GLUT4 bearing different endocytic motifs) exogenously expressed in mammalian L6 cells internalized only through the cholesterol-dependent route that also included the non-clathrin-dependent cargo interleukin-2 receptor beta, and DNP reduced internalization of both proteins. These results suggest that in muscle cells, GLUT4 internalizes simultaneously through clathrin-mediated endocytosis and a caveolae-independent but cholesterol- and dynamin-dependent route. Manipulating GLUT4 endocytosis to maintain surface GLUT4 may bypass insulin resistance.
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Affiliation(s)
- Costin N Antonescu
- Program in Cell Biology, The Hospital For Sick Children, Toronto, Ontario, Canada
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Patel HH, Murray F, Insel PA. Caveolae as organizers of pharmacologically relevant signal transduction molecules. Annu Rev Pharmacol Toxicol 2008; 48:359-91. [PMID: 17914930 PMCID: PMC3083858 DOI: 10.1146/annurev.pharmtox.48.121506.124841] [Citation(s) in RCA: 355] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Caveolae, a subset of membrane (lipid) rafts, are flask-like invaginations of the plasma membrane that contain caveolin proteins, which serve as organizing centers for cellular signal transduction. Caveolins (-1, -2, and -3) have cytoplasmic N and C termini, palmitolylation sites, and a scaffolding domain that facilitates interaction and organization of signaling molecules so as to help provide coordinated and efficient signal transduction. Such signaling components include upstream entities (e.g., G protein-coupled receptors (GPCRs), receptor tyrosine kinases, and steroid hormone receptors) and downstream components (e.g., heterotrimeric and low-molecular-weight G proteins, effector enzymes, and ion channels). Diseases associated with aberrant signaling may result in altered localization or expression of signaling proteins in caveolae. Caveolin-knockout mice have numerous abnormalities, some of which may reflect the impact of total body knockout throughout the life span. This review provides a general overview of caveolins and caveolae, signaling molecules that localize to caveolae, the role of caveolae/caveolin in cardiac and pulmonary pathophysiology, pharmacologic implications of caveolar localization of signaling molecules, and the possibility that caveolae might serve as a therapeutic target.
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Affiliation(s)
- Hemal H Patel
- Department of Anesthesiology, University of California-San Diego, La Jolla, CA, USA
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Traverso M, Gazzerro E, Assereto S, Sotgia F, Biancheri R, Stringara S, Giberti L, Pedemonte M, Wang X, Scapolan S, Pasquini E, Donati MA, Zara F, Lisanti MP, Bruno C, Minetti C. Caveolin-3 T78M and T78K missense mutations lead to different phenotypes in vivo and in vitro. J Transl Med 2008; 88:275-83. [PMID: 18253147 DOI: 10.1038/labinvest.3700713] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Caveolins are the principal protein components of caveolae, invaginations of the plasma membrane involved in cell signaling and trafficking. Caveolin-3 (Cav-3) is the muscle-specific isoform of the caveolin family and mutations in the CAV3 gene lead to a large group of neuromuscular disorders. In unrelated patients, we identified two distinct CAV3 mutations involving the same codon 78. Patient 1, affected by dilated cardiomyopathy and limb girdle muscular dystrophy (LGMD)-1C, shows an autosomal recessive mutation converting threonine to methionine (T78M). Patient 2, affected by isolated familiar hyperCKemia, shows an autosomal dominant mutation converting threonine to lysine (T78K). Cav-3 wild type (WT) and Cav-3 mutations were transiently transfected into Cos-7 cells. Cav-3 WT and Cav-3 T78M mutant localized at the plasma membrane, whereas Cav-3 T78K was retained in a perinuclear compartment. Cav-3 T78K expression was decreased by 87% when compared with Cav-3 WT, whereas Cav-3 T78M protein levels were unchanged. To evaluate whether Cav-3 T78K and Cav-3 T78M mutants behaved with a dominant negative pattern, Cos-7 cells were cotransfected with green fluorescent protein (GFP)-Cav-3 WT in combination with either mutant or WT Cav-3. When cotransfected with Cav-3 WT or Cav-3 T78M, GFP-Cav-3 WT was localized at the plasma membrane, as expected. However, when cotransfected with Cav-3 T78K, GFP-Cav-3 WT was retained in a perinuclear compartment, and its protein levels were reduced by 60%, suggesting a dominant negative action. Accordingly, Cav-3 protein levels in muscles from a biopsy of patient 2 (T78K mutation) were reduced by 80%. In conclusion, CAV3 T78M and T78K mutations lead to distinct disorders showing different clinical features and inheritance, and displaying distinct phenotypes in vitro.
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Affiliation(s)
- Monica Traverso
- Muscular and Neurodegenerative Disease Unit, University of Genoa and G. Gaslini Paediatric Institute, Genoa, Italy
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Inokuchi JI, Kabayama K. Modulation of Growth Factor Receptors in Membrane Microdomains. TRENDS GLYCOSCI GLYC 2008. [DOI: 10.4052/tigg.20.353] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Volonte D, McTiernan CF, Drab M, Kasper M, Galbiati F. Caveolin-1 and caveolin-3 form heterooligomeric complexes in atrial cardiac myocytes that are required for doxorubicin-induced apoptosis. Am J Physiol Heart Circ Physiol 2007; 294:H392-401. [PMID: 17982011 DOI: 10.1152/ajpheart.01039.2007] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Caveolae are 50- to 100-nm invaginations of the plasma membrane. Caveolins are the structural protein components of caveolar membranes. The caveolin gene family is composed of three members: caveolin-1, caveolin-2, and caveolin-3. Caveolin-1 and caveolin-2 are coexpressed in many cell types, including adipocytes, endothelial cells, epithelial cells, and fibroblasts. In contrast, caveolin-3 expression is essentially restricted to skeletal and smooth muscle cells as well as cardiac myocytes. While the interaction between caveolin-1 and caveolin-2 has been documented previously, the reciprocal interaction between endogenous caveolin-1 and caveolin-3 and their functional role in cell types expressing both isoforms have yet to be identified. Here we demonstrate for the first time that caveolin-1 and caveolin-3 are coexpressed in mouse and rat cardiac myocytes of the atria but not ventricles. We also found that caveolin-1 and caveolin-3 can interact and form heterooligomeric complexes in this cell type. Doxorubicin is an effective anticancer agent, but its use is limited by the possible development of cardiotoxicity. Using caveolin-1- and caveolin-3-null mice, we show that both caveolin-1 and caveolin-3 expression are required for doxorubicin-induced apoptosis in the atria through activation of caspase 3. Together, these results bring new insight into the functional role of caveolae and suggest that caveolin-1/caveolin-3 heterooligomeric complexes may play a key role in chemotherapy-induced cardiotoxicity in the atria.
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Affiliation(s)
- Daniela Volonte
- Department of Pharmacology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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Ma DWL. Lipid mediators in membrane rafts are important determinants of human health and disease. Appl Physiol Nutr Metab 2007; 32:341-50. [PMID: 17510668 DOI: 10.1139/h07-036] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The new field of membrane rafts has provided fresh insight and a novel framework in which to understand the interaction, relation, and organization of lipids and proteins within cell membranes. This review will examine our current understanding of membrane rafts and their role in human health. In addition, the effect of various lipids, including dietary lipids, on membrane raft structure and function will be discussed. Membrane rafts are found in all cells and are characterized by their high concentration of cholesterol, sphingolipids, and saturated fatty acids. These lipids impart lateral segregation of membrane proteins, thus facilitating the spatial organization and regulation of membrane proteins involved in many cellular processes, such as cell proliferation, apoptosis, and cell signaling. Therefore, membrane rafts are shedding new light on the origins of metabolic disturbances and diseases such as cancer, insulin resistance, inflammation, cardiovascular disease, and Alzheimer's disease, which will be further discussed in this review.
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Affiliation(s)
- David W L Ma
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Ontario, Canada.
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Kabayama K, Sato T, Saito K, Loberto N, Prinetti A, Sonnino S, Kinjo M, Igarashi Y, Inokuchi JI. Dissociation of the insulin receptor and caveolin-1 complex by ganglioside GM3 in the state of insulin resistance. Proc Natl Acad Sci U S A 2007; 104:13678-83. [PMID: 17699617 PMCID: PMC1949342 DOI: 10.1073/pnas.0703650104] [Citation(s) in RCA: 293] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Membrane microdomains (lipid rafts) are now recognized as critical for proper compartmentalization of insulin signaling. We previously demonstrated that, in adipocytes in a state of TNFalpha-induced insulin resistance, the inhibition of insulin metabolic signaling and the elimination of insulin receptors (IR) from the caveolae microdomains were associated with an accumulation of the ganglioside GM3. To gain insight into molecular mechanisms behind interactions of IR, caveolin-1 (Cav1), and GM3 in adipocytes, we have performed immunoprecipitations, cross-linking studies of IR and GM3, and live cell studies using total internal reflection fluorescence microscopy and fluorescence recovery after photobleaching techniques. We found that (i) IR form complexes with Cav1 and GM3 independently; (ii) in GM3-enriched membranes the mobility of IR is increased by dissociation of the IR-Cav1 interaction; and (iii) the lysine residue localized just above the transmembrane domain of the IR beta-subunit is essential for the interaction of IR with GM3. Because insulin metabolic signal transduction in adipocytes is known to be critically dependent on caveolae, we propose a pathological feature of insulin resistance in adipocytes caused by dissociation of the IR-Cav1 complex by the interactions of IR with GM3 in microdomains.
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Affiliation(s)
- Kazuya Kabayama
- *Division of Glycopathology, Institute of Molecular Biomembranes and Glycobiology, Tohoku Pharmaceutical University, 4-4-1, Komatsushima, Aoba-ku, Sendai 981-8558, Miyagi, Japan
| | - Takashige Sato
- Department of Biomembrane and Biofunctional Chemistry, School of Pharmaceutical Sciences and Pharmacy, and
| | - Kumiko Saito
- Department of Biomembrane and Biofunctional Chemistry, School of Pharmaceutical Sciences and Pharmacy, and
| | - Nicoletta Loberto
- Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Via Fratelli Cervi 93, Segrate 20090, Milan, Italy; and
| | - Alessandro Prinetti
- Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Via Fratelli Cervi 93, Segrate 20090, Milan, Italy; and
| | - Sandro Sonnino
- Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Via Fratelli Cervi 93, Segrate 20090, Milan, Italy; and
| | - Masataka Kinjo
- Laboratory of Supramolecular Biophysics, Research Institute for Electronic Science, Hokkaido University, Nishi 6, Kita 12, Kita-ku, Sapporo 060-0812, Japan
| | - Yasuyuki Igarashi
- Department of Biomembrane and Biofunctional Chemistry, School of Pharmaceutical Sciences and Pharmacy, and
| | - Jin-ichi Inokuchi
- *Division of Glycopathology, Institute of Molecular Biomembranes and Glycobiology, Tohoku Pharmaceutical University, 4-4-1, Komatsushima, Aoba-ku, Sendai 981-8558, Miyagi, Japan
- Core Research for Evolutional Science and Technology Program, Japan Science and Technology Agency, 4-1-8, Honcho Kawaguchi, Saitama 332-0012, Japan
- To whom correspondence should be addressed. E-mail:
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Oh YS, Cho KA, Ryu SJ, Khil LY, Jun HS, Yoon JW, Park SC. Regulation of insulin response in skeletal muscle cell by caveolin status. J Cell Biochem 2007; 99:747-58. [PMID: 16676355 DOI: 10.1002/jcb.20943] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recent studies on the role of caveolin-1 in adipocytes showed that caveolin has emerged as an important regulatory element in insulin signaling but little is known on its role in skeletal muscle cells. In this study, we demonstrate for the first time that caveolin-1 plays a crucial role in insulin dependent glucose uptake in skeletal muscle cells. Differentiation of L6 skeletal muscle cells induce the expression of caveolin-1 and caveolin-3 with partial colocalization. However in contrast to adipocytes, phosphorylation of insulin receptor beta (IRbeta) and Akt/Erk was not affected by the respective downregulation of caveolin-1 or caveolin-3 in the muscle cells. Moreover, the phosphorylation of IRbeta was detected not only in the caveolae but also in the non-caveolae fractions of the muscle cells despite the interaction of IRbeta with caveolin-1 and caveolin-3. These data implicate the lack of relationship between caveolins and IRbeta pathway in the muscle cells, different from the adipocytes. However, glucose uptake was reduced specifically by downregulation of caveolin-1, but not that of caveolin-3. Taken together, these observations suggest that caveolin-1 plays a crucial role in glucose uptake in differentiated muscle cells and that the regulation of caveolin-1 expression may be an important mechanism for insulin sensitivity, implying the role of muscle cells for type 2 diabetes.
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Affiliation(s)
- Yoon Sin Oh
- Department of Biochemistry and Molecular Biology, The Aging and Apoptosis Research Center, Seoul National University College of Medicine, Seoul, Korea
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Patel HH, Zhang S, Murray F, Suda RYS, Head BP, Yokoyama U, Swaney JS, Niesman IR, Schermuly RT, Pullamsetti SS, Thistlethwaite PA, Miyanohara A, Farquhar MG, Yuan JXJ, Insel PA. Increased smooth muscle cell expression of caveolin-1 and caveolae contribute to the pathophysiology of idiopathic pulmonary arterial hypertension. FASEB J 2007; 21:2970-9. [PMID: 17470567 DOI: 10.1096/fj.07-8424com] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Vasoconstriction and vascular medial hypertrophy, resulting from increased intracellular [Ca2+] in pulmonary artery smooth muscle cells (PASMC), contribute to elevated vascular resistance in patients with idiopathic pulmonary arterial hypertension (IPAH). Caveolae, microdomains within the plasma membrane, contain the protein caveolin, which binds certain signaling molecules. We tested the hypothesis that PASMC from IPAH patients express more caveolin-1 (Cav-1) and caveolae, which contribute to increased capacitative Ca2+ entry (CCE) and DNA synthesis. Immunohistochemistry showed increased expression of Cav-1 in smooth muscle cells but not endothelial cells of pulmonary arteries from patients with IPAH. Subcellular fractionation and electron microscopy confirmed the increase in Cav-1 and caveolae expression in IPAH-PASMC. Treatment of IPAH-PASMC with agents that deplete membrane cholesterol (methyl-beta-cyclodextrin or lovastatin) disrupted caveolae, attenuated CCE, and inhibited DNA synthesis of IPAH-PASMC. Increasing Cav-1 expression of normal PASMC with a Cav-1-encoding adenovirus increased caveolae formation, CCE, and DNA synthesis; treatment of IPAH-PASMC with siRNA targeted to Cav-1 produced the opposite effects. Treatments that down-regulate caveolin/caveolae expression, including cholesterol-lowering drugs, reversed the increased CCE and DNA synthesis in IPAH-PASMC. Increased caveolin and caveolae expression thus contribute to IPAH-PASMC pathophysiology. The close relationship between caveolin/caveolae expression and altered cell physiology in IPAH contrast with previous results obtained in various animal models, including caveolin-knockout mice, thus emphasizing unique features of the human disease. The results imply that disruption of caveolae in PASMC may provide a novel therapeutic approach to attenuate disease manifestations of IPAH.
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Affiliation(s)
- Hemal H Patel
- University of California, San Diego, Department of Pharmacology, 9500 Gilman Dr., La Jolla, CA 92093-0636, USA
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42
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Abstract
Membrane microdomains (lipid rafts) are now recognized as critical for proper compartmentalization of insulin signaling, but their role in the pathogenesis of insulin resistance has not been investigated. Detergent-resistant membrane microdomains (DRMs), isolated in the low density fractions, are highly enriched in cholesterol, glycosphingolipids and various signaling molecules. TNFalpha induces insulin resistance in type 2 diabetes, but its mechanism of action is not fully understood. We have found a selective increase in the acidic glycosphingolipid ganglioside GM3 in 3T3-L1 adipocytes treated with TNFalpha, suggesting a specific function for GM3. We were able to extend these in vitro observations to living animals using obese Zucker fa/fa rats and ob/ob mice, in which the GM3 synthase mRNA levels in the white adipose tissues are significantly higher than in their lean controls. In the DRMs from TNFalpha-treated 3T3-L1 adipocytes, GM3 levels were doubled, compared to results in normal adipocytes. Additionally, insulin receptor (IR) accumulations in the DRMs were diminished, while caveolin and flotillin levels were unchanged. GM3 depletion was able to counteract the TNFalpha-induced inhibition of IR accumulation into DRMs. Together, these findings provide compelling evidence that in insulin resistance the insulin metabolic signaling defect can be attributed to a loss of IRs in the microdomains due to an accumulation of GM3.
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Affiliation(s)
- Jin-ichi Inokuchi
- Division of Glycopathology and CREST, Japan Science and Technology Agency, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan.
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43
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Abstract
Lipid rafts and their related membrane vesicular structures, caveolae, are cholesterol- and sphingolipid-rich microdomains of the plasma membrane that have attracted considerable interest because of their ability to concentrate numerous signaling proteins. Efforts to define the proteins that reside in lipid rafts and caveolae as well as investigations into the functional role of these microdomains in signaling, endocytosis, and other cellular processes have led to the hypothesis that they compartmentalize or prearrange molecules involved in regulating these pathways. This chapter describes biochemical approaches for defining lipid rafts and caveolae. Included are detergent- and nondetergent-based fractionations on sucrose-density gradients that isolate buoyant lipid rafts and caveolae as well as caveolin antibody-based immunoisolation of detergent-insoluble membranes that selectively isolates caveolae and not lipid rafts. Also, a general method to disrupt lipid rafts and caveolae using beta-cyclodextrin that is useful for probing the role of these microdomains in cellular processes is described. The advantages and disadvantages of the respective approaches are discussed. Taken together, these methods are useful for defining the role of lipid rafts and caveolae in cell signaling.
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Affiliation(s)
- Rennolds S Ostrom
- Department of Pharmacology and the Vascular Biology Center of Excellence, The University of Tennessee Health Science Center, Memphis, USA
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44
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Abstract
Membrane microdomains (lipid rafts) are now recognized as critical for proper compartmentalization of insulin signaling, but their role in the pathogenesis of insulin resistance has not been investigated. Detergent-resistant membrane microdomains (DRMs), isolated in the low density fractions, are highly enriched in cholesterol, glycosphingolipids and various signaling molecules. TNFalpha induces insulin resistance in type 2 diabetes, but its mechanism of action is not fully understood. We have found a selective increase in the acidic glycosphingolipid ganglioside GM3 in 3T3-L1 adipocytes treated with TNFalpha, suggesting a specific function for GM3. We were able to extend these in vitro observations to living animals using obese Zucker fa/fa rats and ob/ob mice, in which the GM3 synthase mRNA levels in the white adipose tissues are significantly higher than in their lean controls. In the DRMs from TNFalpha-treated 3T3-L1 adipocytes, GM3 levels were doubled, compared to results in normal adipocytes. Additionally, insulin receptor (IR) accumulations in the DRMs were diminished, while caveolin and flotillin levels were unchanged. GM3 depletion was able to counteract the TNFalpha-induced inhibition of IR accumulation into DRMs. Together, these findings provide compelling evidence that in insulin resistance the insulin metabolic signaling defect can be attributed to a loss of IRs in the microdomains due to an accumulation of GM3.
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Affiliation(s)
- Jin-ichi Inokuchi
- Department of Biomembrane and Biofunctional Chemistry and CREST, Japan Science and Technology Agency, Graduate School of Pharmaceutical Sciences, Hokkaido University, Japan.
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45
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König P, Krasteva G, Tag C, König IR, Arens C, Kummer W. FRET-CLSM and double-labeling indirect immunofluorescence to detect close association of proteins in tissue sections. J Transl Med 2006; 86:853-64. [PMID: 16783395 DOI: 10.1038/labinvest.3700443] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
It is pivotal to identify protein-protein interaction in situ to understand protein function. Conventional methods to determine the interaction of proteins destruct tissue or are applicable to cell culture only. To identify association of proteins in cells in tissue, we adapted indirect double-labeling immunofluorescence and combined it with conventional confocal laser scanning microscopy (CLSM) to measure fluorescence resonance energy transfer (FRET). As a model system, we chose caveolin-1alpha and caveolin-2, two major components of endothelial caveolae, and examined their interaction in the endothelium of vessels in fixed tissues of laboratory animals and human glomus tumors. Several methodological aspects were examined. Measuring the absolute increase in fluorescence (DeltaIF) was superior compared to determining the relative FRET efficiency, because it is more robust against small increases of fluorescence during measurements that results from unavoidable minimal crossreactivity of the secondary antibodies. Both, sequential and simultaneous incubation of secondary antibodies result in robust and reliable increases in DeltaIF. If incubated sequentially, however, the acceptor-labeled secondary antibody should be applied first. The size of the secondary reagent (F(ab')2 vs whole antibody) has no major influence. In conclusion, CLSM-FRET can measure close spatial association of proteins in situ and can be applied to human surgical material.
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Affiliation(s)
- Peter König
- Institut für Anatomie und Zellbiologie, Justus-Liebig-Universität Giessen, Giessen, Germany.
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Head BP, Patel HH, Roth DM, Murray F, Swaney JS, Niesman IR, Farquhar MG, Insel PA. Microtubules and actin microfilaments regulate lipid raft/caveolae localization of adenylyl cyclase signaling components. J Biol Chem 2006; 281:26391-9. [PMID: 16818493 DOI: 10.1074/jbc.m602577200] [Citation(s) in RCA: 219] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Microtubules and actin filaments regulate plasma membrane topography, but their role in compartmentation of caveolae-resident signaling components, in particular G protein-coupled receptors (GPCR) and their stimulation of cAMP production, has not been defined. We hypothesized that the microtubular and actin cytoskeletons influence the expression and function of lipid rafts/caveolae, thereby regulating the distribution of GPCR signaling components that promote cAMP formation. Depolymerization of microtubules with colchicine (Colch) or actin microfilaments with cytochalasin D (CD) dramatically reduced the amount of caveolin-3 in buoyant (sucrose density) fractions of adult rat cardiac myocytes. Colch or CD treatment led to the exclusion of caveolin-1, caveolin-2, beta1-adrenergic receptors (beta1-AR), beta2-AR, Galpha(s), and adenylyl cyclase (AC)5/6 from buoyant fractions, decreasing AC5/6 and tyrosine-phosphorylated caveolin-1 in caveolin-1 immunoprecipitates but in parallel increased isoproterenol (beta-AR agonist)-stimulated cAMP production. Incubation with Colch decreased co-localization (by immunofluorescence microscopy) of caveolin-3 and alpha-tubulin; both Colch and CD decreased co-localization of caveolin-3 and filamin (an F-actin cross-linking protein), decreased phosphorylation of caveolin-1, Src, and p38 MAPK, and reduced the number of caveolae/mum of sarcolemma (determined by electron microscopy). Treatment of S49 T-lymphoma cells (which possess lipid rafts but lack caveolae) with CD or Colch redistributed a lipid raft marker (linker for activation of T cells (LAT)) and Galpha(s) from lipid raft domains. We conclude that microtubules and actin filaments restrict cAMP formation by regulating the localization and interaction of GPCR-G(s)-AC in lipid rafts/caveolae.
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Affiliation(s)
- Brian P Head
- Department of Pharmacology, University of California, San Diego, La Jolla, California 92093, USA
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47
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Zhu Z, Li Y, Mo D, Li K, Zhao S. Molecular characterization and expression analysis of the porcine caveolin-3 gene. Biochem Biophys Res Commun 2006; 346:7-13. [PMID: 16750814 DOI: 10.1016/j.bbrc.2006.04.132] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Accepted: 04/24/2006] [Indexed: 01/09/2023]
Abstract
Caveolin-3 is the muscle-specific form of the caveolin protein family and plays an important role in modulating both the morphological appearance and function of caveolae. In this study, we cloned and characterized caveolin-3 from porcine muscle. The promoter of porcine caveolin-3 contained three consensus E box elements and one RORalpha2 monomeric binding motif. The deduced amino acid sequence of porcine caveolin-3 contains a WW domain. This gene was mapped to SSC13 q23-q24 by the SCHP and the IMpRH panel. RT-PCR analyses showed that caveolin-3 was expressed specifically in skeletal muscle and heart. And we provide the first evidence that caveolin-3 has a certain regulated expression pattern during the prenatal period of the porcine skeletal muscle development. This result suggests that the caveolin-3 gene might be a candidate gene of meat production trait and provides some information for establishing of an animal model using pig to study human caveolinopathies.
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Affiliation(s)
- Zhengmao Zhu
- Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, PR China
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Liu L, Askari A. Beta-subunit of cardiac Na+-K+-ATPase dictates the concentration of the functional enzyme in caveolae. Am J Physiol Cell Physiol 2006; 291:C569-78. [PMID: 16624992 DOI: 10.1152/ajpcell.00002.2006] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Previous studies showed the presence of a significant fraction of Na(+)-K(+)-ATPase alpha-subunits in cardiac myocyte caveolae, suggesting the caveolar interactions of Na(+)-K(+)-ATPase with its signaling partners. Because both alpha- and beta-subunits are required for ATPase activity, to clarify the status of the pumping function of caveolar Na(+)-K(+)-ATPase, we have examined the relative distribution of two major subunit isoforms (alpha(1) and beta(1)) in caveolar and noncaveolar membranes of adult rat cardiac myocytes. When cell lysates treated with high salt (Na(2)CO(3) or KCl) concentrations were fractionated by a standard density gradient procedure, the resulting light caveolar membranes contained 30-40% of alpha(1)-subunits and 80-90% of beta(1)-subunits. Use of Na(2)CO(3) was shown to inactivate Na(+)-K(+)-ATPase; however, caveolar membranes obtained by the KCl procedure were not denatured and contained approximately 75% of total myocyte Na(+)-K(+)-ATPase activity. Sealed isolated caveolae exhibited active Na(+) transport. Confocal microscopy supported the presence of alpha,beta-subunits in caveolae, and immunoprecipitation showed the association of the subunits with caveolin oligomers. The findings indicate that cardiac caveolar inpocketings are the primary portals for active Na(+)-K(+) fluxes, and the sites where the pumping and signaling functions of Na(+)-K(+)-ATPase are integrated. Preferential concentration of beta(1)-subunit in caveolae was cell specific; it was also noted in neonatal cardiac myocytes but not in fibroblasts and A7r5 cells. Uneven distributions of alpha(1) and beta(1) in early and late endosomes of myocytes suggested different internalization routes of two subunits as a source of selective localization of active Na(+)-K(+)-ATPase in cardiac caveolae.
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Affiliation(s)
- Lijun Liu
- Department of Physiology, Pharmacology, Metabolism, and Cardiovascular Sciences, Medical Univ. of Ohio, 3035 Arlington Ave., Toledo, OH 43614-5804, USA
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49
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Kogo H, Ito SY, Moritoki Y, Kurahashi H, Fujimoto T. Differential expression of caveolin-3 in mouse smooth muscle cells in vivo. Cell Tissue Res 2006; 324:291-300. [PMID: 16609918 DOI: 10.1007/s00441-005-0130-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2005] [Accepted: 11/11/2005] [Indexed: 10/25/2022]
Abstract
Expression of caveolin-1 and -3 in mouse smooth muscle cells in vivo was examined by immunohistochemistry. Caveolin-1 was detected in almost all smooth muscles examined, except for the pupillary dilator muscle, whereas caveolin-3 was present only in smooth muscles of some specific tissues. In the eye, the pupillary sphincter muscle was intensely positive for caveolin-3, whereas the ciliary muscle and pupillary dilator muscle were negative. In the gastrointestinal tract, caveolin-3 was detected in the inner circular layer, but not in the outer longitudinal layer. Vascular smooth muscle cells of the resistance-sized artery in the uterus and corpus cavernosum were intensely positive for caveolin-3, whereas those of the aorta were only weakly positive and those of the vena cava were negative. Caveolin-3 was also detected in smooth muscle cells of the urinary bladder, ureter, prostatic vas deferens, and seminal vesicle. The different levels of caveolin-3 expression among various smooth muscle tissues were confirmed by Western blot analysis. Even within the same muscle, the relative expression levels of caveolin-1 and -3 were variable among neighboring cells, suggesting distinct fine regulation of expression of these two caveolins. Moreover, even in the same cell, caveolin-1 and -3 showed different distributions. These results indicate that the two caveolins form distinct caveolae in smooth muscles, and that caveolin-1 and -3 serve different functions. Their differential expression may therefore be related to the functional diversity of smooth muscles.
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Affiliation(s)
- Hiroshi Kogo
- Department of Anatomy and Molecular Cell Biology, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, 466-8550, Japan.
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50
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Cho WJ, Daniel EE. Colocalization between caveolin isoforms in the intestinal smooth muscle and interstitial cells of Cajal of the Cav1(+/+) and Cav1 (-/-) mouse. Histochem Cell Biol 2005; 126:9-16. [PMID: 16369777 DOI: 10.1007/s00418-005-0128-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/01/2005] [Indexed: 01/25/2023]
Abstract
Confocal microscopic images were obtained from the immunohistochemical sections of jejeunum to determine the localization/colocalization between caveolin-1, caveolin-2 and caveolin-3 in intestinal smooth muscle cells (SMCs) and interstitial cells of Cajal (ICC) of Cav1(+/+) and Cav1(-/-) mouse. Intestinal regions were segmented [inner circular muscle (icm), outer circular muscle (ocm), myenteric plexus region (mp), and longitudinal muscle (lm)] by LSM 5 and analyzed by ImageJ to show Pearson's correlation (r (p)) and overlap coefficient (r) of colocalization. In the intestine of Cav1(+/+), caveolin-1 (cav1) was colocalized with caveolin-2 (cav2) and caveolin-3 (cav3). Cav2 also was well colocalized with cav3. In the intestine of Cav1(-/-), cav1 and cav2 were absent in all images, but reduced cav3 was expressed in ocm. Caveolae were present in cell types with cav1 in Cav1(+/+), and present with cav3 in ocm of Cav1(-/-). C-kit occurred in deep muscular plexus (ICC-DMP) and myenteric plexus (ICC-MP), in both Cav1(+/+) and Cav1(-/-), and colocalized with cav1 and cav2 in the intestine of Cav1(+/+). Cav3 was absent/present at low immunoreactivity in ICC-DMP and ICC-MP of the intestines of Cav1(+/+) and Cav1(-/-). To conclude, cav1 is necessary for the expression of cav2 in SMC and ICC of intestine and facilitates, but is not necessary for the expression of cav3.
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Affiliation(s)
- Woo Jung Cho
- Department of Pharmacology, Faculty of Medicine and Dentistry, University of Alberta, Room 9-10, Medical Sciences Building, T6G 2H7, Edmonton, AB, Canada
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