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de Mattos ABM, Ribeiro-Silva JC, Fonseca-Alaniz MH, Valadão IC, da Silva ES, Krieger JE, Miyakawa AA. Cysteine and glycine-rich protein 3 (Crp3) as a critical regulator of elastolysis, inflammation, and smooth muscle cell apoptosis in abdominal aortic aneurysm development. Front Physiol 2023; 14:1252470. [PMID: 38173933 PMCID: PMC10762791 DOI: 10.3389/fphys.2023.1252470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 12/05/2023] [Indexed: 01/05/2024] Open
Abstract
Abdominal aortic aneurysm (AAA) is a life-threatening vascular disease for which surgical or endovascular repair are the only currently available therapeutic strategies. The development of AAA involves the breakdown of elastic fibers (elastolysis), infiltration of inflammatory cells, and apoptosis of smooth muscle cells (SMCs). However, the specific regulators governing these responses remain unknown. We previously demonstrated that Cysteine and glycine-rich protein 3 (Crp3) sensitizes SMCs to apoptosis induced by stretching. Building upon this finding, we aimed to investigate the influence of Crp3 on elastolysis and apoptosis during AAA development. Using the elastase-CaCl2 rat model, we observed an increase in Crp3 expression, aortic diameter, and a reduction in wall thickness in wild type rats. In contrast, Crp3-/- rats exhibited a decreased incidence of AAA, with minimal or no changes in aortic diameter and thickness. Histopathological analysis revealed the absence of SMC apoptosis and degradation of elastic fibers in Crp3-/- rats, accompanied by reduced inflammation and diminished proteolytic capacity in Crp3-/- SMCs and bone marrow-derived macrophages. Collectively, our findings provide evidence that Crp3 plays a crucial role in AAA development by modulating elastolysis, inflammation, and SMC apoptosis. These results underscore the potential significance of Crp3 in the context of AAA progression and offer new insights into therapeutic targets for this disease.
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Affiliation(s)
- Ana Barbosa Marcondes de Mattos
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Joao Carlos Ribeiro-Silva
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Miriam Helena Fonseca-Alaniz
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Iuri Cordeiro Valadão
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Erasmo Simão da Silva
- Divisão de Cirurgia Vascular e Endovascular, Departamento de Cirurgia, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Jose Eduardo Krieger
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Ayumi Aurea Miyakawa
- Laboratorio de Genética e Cardiologia Molecular, Instituto do Coração (InCor), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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Dieffenbach PB, Mallarino Haeger C, Rehman R, Corcoran AM, Coronata AMF, Vellarikkal SK, Chrobak I, Waxman AB, Vitali SH, Sholl LM, Padera RF, Lagares D, Polverino F, Owen CA, Fredenburgh LE. A Novel Protective Role for Matrix Metalloproteinase-8 in the Pulmonary Vasculature. Am J Respir Crit Care Med 2021; 204:1433-1451. [PMID: 34550870 PMCID: PMC8865706 DOI: 10.1164/rccm.202108-1863oc] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 09/22/2021] [Indexed: 11/16/2022] Open
Abstract
Rationale: Mechanical signaling through cell-matrix interactions plays a major role in progressive vascular remodeling in pulmonary arterial hypertension (PAH). MMP-8 (matrix metalloproteinase-8) is an interstitial collagenase involved in regulating inflammation and fibrosis of the lung and systemic vasculature, but its role in PAH pathogenesis remains unexplored. Objectives: To evaluate MMP-8 as a modulator of pathogenic mechanical signaling in PAH. Methods: MMP-8 levels were measured in plasma from patients with pulmonary hypertension (PH) and controls by ELISA. MMP-8 vascular expression was examined in lung tissue from patients with PAH and rodent models of PH. MMP-8-/- and MMP-8+/+ mice were exposed to normobaric hypoxia or normoxia for 4-8 weeks. PH severity was evaluated by right ventricular systolic pressure, echocardiography, pulmonary artery morphometry, and immunostaining. Proliferation, migration, matrix component expression, and mechanical signaling were assessed in MMP-8-/- and MMP-8+/+ pulmonary artery smooth muscle cells (PASMCs). Measurements and Main Results: MMP-8 expression was significantly increased in plasma and pulmonary arteries of patients with PH compared with controls and induced in the pulmonary vasculature in rodent PH models. Hypoxia-exposed MMP-8-/- mice had significant mortality, increased right ventricular systolic pressure, severe right ventricular dysfunction, and exaggerated vascular remodeling compared with MMP-8+/+ mice. MMP-8-/- PASMCs demonstrated exaggerated proliferation and migration mediated by altered matrix protein expression, elevated integrin-β3 levels, and induction of FAK (focal adhesion kinase) and downstream YAP (Yes-associated protein)/TAZ (transcriptional coactivator with PDZ-binding motif) activity. Conclusions: MMP-8 is a novel protective factor upregulated in the pulmonary vasculature during PAH pathogenesis. MMP-8 opposes pathologic mechanobiological feedback by altering matrix composition and disrupting integrin-β3/FAK and YAP/TAZ-dependent mechanical signaling in PASMCs.
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Affiliation(s)
| | | | | | | | | | | | - Izabela Chrobak
- Lovelace Respiratory Research Institute, Albuquerque, New Mexico
| | | | - Sally H. Vitali
- Department of Anesthesiology, Critical Care, and Pain Medicine, Boston Children’s Hospital, Boston, Massachusetts; and
| | - Lynette M. Sholl
- Department of Pathology, Brigham and Women’s Hospital, Boston, Massachusetts
| | - Robert F. Padera
- Department of Pathology, Brigham and Women’s Hospital, Boston, Massachusetts
| | - David Lagares
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts
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Li SM, Liu WT, Yang F, Yi QJ, Zhang S, Jia HL. Phosphorylated proteomics analysis of human coronary artery endothelial cells stimulated by Kawasaki disease patients serum. BMC Cardiovasc Disord 2019; 19:21. [PMID: 30654760 PMCID: PMC6337789 DOI: 10.1186/s12872-018-0982-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 12/17/2018] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Kawasaki disease (KD) is an acute febrile childhood systemic vasculitis that disturbs coronary arteries. The pathogenesis remains unknown. The study of phosphorylated proteins helps to elucidate the relevant pathophysiological mechanisms of cardiovascular disease. However, few researches explored phosphorylated proteins in KD patients. METHODS We compared phosphoprotein profiles of HCAECs stimulated by the serum of KD patients and normal children using iTRAQ technology, TiO2 enrichment phosphorylated peptide and MS analysis. Then we conducted the functional analysis by ClueGO and the biological interaction networking analysis by ReactomeFIViz. Western blotting was performed to identify the hub proteins. RESULTS Our results revealed that phosphorylation of 148 proteins showed different intensities between the two HCAECs groups, which are enriched in MAPK, VEGFR, EGFR, Angiopoietin receptor, mTOR, FAK signaling pathway and so on. Through the Network Analyzer analysis, the hub proteins are CDKN1A, MAPK1 and POLR2A, which were experimentally validated. CONCLUSION In summary, we provided evidence addressing the valuable phosphorylation signaling that could be useful resource to understand the molecular mechanism and the potential targets for novel therapy of KD.
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Affiliation(s)
- Shui-Ming Li
- College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Microbial Genetic Engineering, Shenzhen University, Shenzhen, Guangdong, China
| | - Wan-Ting Liu
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, No.601, West Huangpu Avenue, Guangzhou, 510632, Guangdong, China
| | - Fang Yang
- Department of Pediatrics, First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Qi-Jian Yi
- Department of Cardiovascular Medicine, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child development and Disorder, China International Science and Technology Coorperation base of Child development and Critical Disorder, Chongqing Key Laboratory of Pediatrics, Chongqing, China.
| | - Shuai Zhang
- Department of Medical Biochemistry and Molecular Biology, School of Basic Medical Sciences, Jinan University, Guangzhou, Guangdong, China.
| | - Hong-Ling Jia
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, No.601, West Huangpu Avenue, Guangzhou, 510632, Guangdong, China.
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Kowtharapu BS, Murín R, Jünemann AGM, Stachs O. Role of Corneal Stromal Cells on Epithelial Cell Function during Wound Healing. Int J Mol Sci 2018; 19:E464. [PMID: 29401709 DOI: 10.3390/ijms19020464] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 01/31/2018] [Accepted: 02/01/2018] [Indexed: 01/12/2023] Open
Abstract
Following injury, corneal stromal keratocytes transform into repair-phenotype of activated stromal fibroblasts (SFs) and participate in wound repair. Simultaneously, ongoing bi-directional communications between corneal stromal-epithelial cells also play a vital role in mediating the process of wound healing. Factors produced by stromal cells are known to induce proliferation, differentiation, and motility of corneal epithelial cells, which are also subsequently the main processes that occur during wound healing. In this context, the present study aims to investigate the effect of SFs conditioned medium (SFCM) on corneal epithelial cell function along with substance P (SP). Antibody microarrays were employed to profile differentially expressed cell surface markers and cytokines in the presence of SFCM and SP. Antibody microarray data revealed enhanced expression of the ITGB1 in corneal epithelial cells following stimulation with SP whereas SFCM induced abundant expression of IL-8, ITGB1, PD1L1, PECA1, IL-15, BDNF, ICAM1, CD8A, CD44 and NTF4. All these proteins have either direct or indirect roles in epithelial cell growth, movement and adhesion related signaling cascades during tissue regeneration. We also observed activation of MAPK signaling pathway along with increased expression of focal adhesion kinase (FAK), paxillin, vimentin, β-catenin and vasodilator-stimulated phosphoprotein (VASP) phosphorylation. Additionally, epithelial-to-mesenchymal transition (EMT) regulating transcription factors Slug and ZEB1 expression were enhanced in the presence of SFCM. SP enriched the expression of integrin subunits α4, α5, αV, β1 and β3 whereas SFCM increased α4, α5, αV, β1 and β5 integrin subunits. We also observed increased expression of Serpin E1 following SP and SFCM treatment. Wound healing scratch assay revealed enhanced migration of epithelial cells following the addition of SFCM. Taken together, we conclude that SFCM-mediated sustained activation of ZEB1, Slug in combination with upregulated migration-associated integrins and ERK (Extracellular signal-regulated kinase)-FAK-paxillin axis, may lead to induce type 2 EMT-like changes during corneal epithelial wound healing.
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Shih CH, Chiang TB, Wang WJ. Convulxin, a C-type lectin-like protein, inhibits HCASMCs functions via WAD-motif/integrin-αv interaction and NF-κB-independent gene suppression of GRO and IL-8. Exp Cell Res 2017; 352:234-244. [PMID: 28192121 DOI: 10.1016/j.yexcr.2017.02.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 01/25/2017] [Accepted: 02/07/2017] [Indexed: 01/13/2023]
Abstract
Convulxin (CVX), a C-type lectin-like protein (CLPs), is a potent platelet aggregation inducer. To evaluate its potential applications in angiogenic diseases, the multimeric CVX were further explored on its mode of actions toward human coronary artery smooth muscle cells (HCASMCs). The N-terminus of β-chain of CVX (CVX-β) contains a putative disintegrin-like domain with a conserved motif upon the sequence comparison with other CLPs. Importantly, native CVX had no cytotoxic activity as examined by electrophoretic pattern. A Trp-Ala-Asp (WAD)-containing octapeptide, MTWADAEK, was thereafter synthesized and analyzed in functional assays. In the case of specific integrin antagonists as positive controls, the anti-angiogenic effects of CVX on HCASMCs were investigated by series of functional analyses. CVX showed to exhibit multiple inhibitory activities toward HCASMCs proliferation, adhesion and invasion with a dose- and integrin αvβ3-dependent fashion. However, the WAD-octapeptide exerting a minor potency could also work as an active peptidomimetic. In addition, flow cytometric analysis demonstrated both the intact CVX and synthetic peptide can specifically interact with integrin-αv on HCASMCs and CVX was shown to have a down-regulatory effect on the gene expression of CXC-chemokines, such as growth-related oncogene and interleukin-8. According to nuclear factor-κB (NF-κB) p65 translocation assay and Western blotting analysis, the NF-κB activation was not involved in the signaling events of CVX-induced gene expression. In conclusion, CVX may act as a disintegrin-like protein via the interactions of WAD-motif in CVX-β with integrin-αv on HCASMCs and it also is a gene suppressor with the ability to diminish the expression of two CXC-chemokines in a NF-κB-independent manner. Indeed, more extensive investigations are needed and might create a new avenue for the development of a novel angiostatic agent.
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Affiliation(s)
- Chun-Ho Shih
- Chang Gung University of Science and Technology, Guishan Dist., Taoyuan City, Taiwan
| | - Tin-Bin Chiang
- Chang Gung University of Science and Technology, Guishan Dist., Taoyuan City, Taiwan
| | - Wen-Jeng Wang
- Chang Gung University of Science and Technology, Guishan Dist., Taoyuan City, Taiwan; Department of Neurological Surgery, Chang Gung Memorial Hospital, Guishan Dist., Taoyuan City, Taiwan.
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Harada T, Yoshimura K, Yamashita O, Ueda K, Morikage N, Sawada Y, Hamano K. Focal Adhesion Kinase Promotes the Progression of Aortic Aneurysm by Modulating Macrophage Behavior. Arterioscler Thromb Vasc Biol 2016; 37:156-165. [PMID: 27856458 DOI: 10.1161/atvbaha.116.308542] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/31/2016] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Abdominal aortic aneurysm (AAA) is a life-threatening vascular disease that is associated with persistent inflammation and extracellular matrix degradation. The molecular mechanisms underlying the macrophage-mediated progression of AAA remain largely unclear. APPROACH AND RESULTS We show that focal adhesion kinase (FAK) expression and activity are enhanced in macrophages that are recruited to AAA tissue. FAK potentiates tumor necrosis factor-α-induced secretion of matrix-degrading enzymes and chemokines by cultured macrophages. FAK also promotes macrophage chemotaxis. In mice, the administration of a FAK inhibitor that tempers local macrophage accumulation markedly suppresses the development and progression of chemically induced AAA. CONCLUSIONS FAK plays a key role in macrophage behavior, which underlies the chronic progression of AAA. These findings provide insights into AAA progression and identify FAK as a novel therapeutic target.
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Affiliation(s)
- Takasuke Harada
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
| | - Koichi Yoshimura
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.).
| | - Osamu Yamashita
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
| | - Koshiro Ueda
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
| | - Noriyasu Morikage
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
| | - Yasuhiro Sawada
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
| | - Kimikazu Hamano
- From the Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (T.H., K.Y., O.Y., K.U., N.M., K.H.); Graduate School of Health and Welfare, Yamaguchi Prefectural University, Japan (K.Y.); Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan (Y.S.)
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Schlosser A, Pilecki B, Hemstra LE, Kejling K, Kristmannsdottir GB, Wulf-Johansson H, Moeller JB, Füchtbauer EM, Nielsen O, Kirketerp-Møller K, Dubey LK, Hansen PBL, Stubbe J, Wrede C, Hegermann J, Ochs M, Rathkolb B, Schrewe A, Bekeredjian R, Wolf E, Gailus-Durner V, Fuchs H, Hrabě de Angelis M, Lindholt JS, Holmskov U, Sorensen GL. MFAP4 Promotes Vascular Smooth Muscle Migration, Proliferation and Accelerates Neointima Formation. Arterioscler Thromb Vasc Biol 2015; 36:122-33. [PMID: 26564819 DOI: 10.1161/atvbaha.115.306672] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 10/29/2015] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Arterial injury stimulates remodeling responses that, when excessive, lead to stenosis. These responses are influenced by integrin signaling in vascular smooth muscle cells (VSMCs). Microfibrillar-associated protein 4 (MFAP4) is an integrin ligand localized to extracellular matrix fibers in the vascular wall. The role of MFAP4 in vascular biology is unknown. We aimed to test the hypothesis that MFAP4 would enhance integrin-dependent VSMC activation. APPROACH AND RESULTS We produced Mfap4-deficient (Mfap4(-/-)) mice and performed carotid artery ligation to explore the role of MFAP4 in vascular biology in vivo. Furthermore, we investigated the effects of MFAP4 in neointimal formation ex vivo and in primary VSMC and monocyte cultures in vitro. When challenged with carotid artery ligation, Mfap4(-/-) mice exhibited delayed neointimal formation, accompanied by early reduction in the number of proliferating medial and neointimal cells, as well as infiltrating leukocytes. Delayed neointimal formation was associated with decreased cross-sectional area of ligated Mfap4(-/-) carotid arteries resulting in lumen narrowing 28 days after ligation. MFAP4 blockade prohibited the formation of neointimal hyperplasia ex vivo. Moreover, we demonstrated that MFAP4 is a ligand for integrin αVβ3 and mediates VSMC phosphorylation of focal adhesion kinase, migration, and proliferation in vitro. MFAP4-dependent VSMC activation was reversible by treatment with MFAP4-blocking antibodies and inhibitors of focal adhesion kinase and downstream kinases. In addition, we showed that MFAP4 promotes monocyte chemotaxis in integrin αVβ3-dependent manner. CONCLUSIONS MFAP4 regulates integrin αVβ3-induced VSMC proliferation and migration, as well as monocyte chemotaxis, and accelerates neointimal hyperplasia after vascular injury.
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Affiliation(s)
- Anders Schlosser
- From the Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark (A.S., B.P., L.E.H., K.K., G.B.K., H.W.-J., J.B.M., K.K.-M., L.K.D., P.B.L.H., J.S., U.H, G.L.S.); Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark (E.-M.F.); Department of Pathology, Odense University Hospital, Odense, Denmark (O.N.); Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany (C.W., J.H., M.O.); Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany (C.W., J.H., M.O.); REBIRTH Cluster of Excellence, Hannover, Germany (C.W., J.H., M.O.); German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany (B.R., A.S., V.G.-D., H.F., M.H.d.A.); Institute of Molecular Animal Breeding and Biotechnology, Gene Center, Ludwig-Maximilians-University München, Munich, Germany (B.R, E.W.); Division of Cardiology, Department of Medicine III, University of Heidelberg, Heidelberg, Germany (A.S., R.B.); Chair of Experimental Genetics, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Freising-Weihenstephan, Munich, Germany (M.H.d.A.); Cardiovascular Research Unit, Viborg Hospital, Viborg, Denmark (J.S.L.); and Department of Cardiothoracic and Vascular Surgery, Center of Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital, Odense, Denmark (J.S.L.)
| | - Bartosz Pilecki
- From the Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark (A.S., B.P., L.E.H., K.K., G.B.K., H.W.-J., J.B.M., K.K.-M., L.K.D., P.B.L.H., J.S., U.H, G.L.S.); Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark (E.-M.F.); Department of Pathology, Odense University Hospital, Odense, Denmark (O.N.); Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany (C.W., J.H., M.O.); Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany (C.W., J.H., M.O.); REBIRTH Cluster of Excellence, Hannover, Germany (C.W., J.H., M.O.); German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany (B.R., A.S., V.G.-D., H.F., M.H.d.A.); Institute of Molecular Animal Breeding and Biotechnology, Gene Center, Ludwig-Maximilians-University München, Munich, Germany (B.R, E.W.); Division of Cardiology, Department of Medicine III, University of Heidelberg, Heidelberg, Germany (A.S., R.B.); Chair of Experimental Genetics, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Freising-Weihenstephan, Munich, Germany (M.H.d.A.); Cardiovascular Research Unit, Viborg Hospital, Viborg, Denmark (J.S.L.); and Department of Cardiothoracic and Vascular Surgery, Center of Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital, Odense, Denmark (J.S.L.)
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Moraes JA, Frony AC, Dias AM, Renovato-Martins M, Rodrigues G, Marcinkiewicz C, Assreuy J, Barja-Fidalgo C. Alpha1beta1 and integrin-linked kinase interact and modulate angiotensin II effects in vascular smooth muscle cells. Atherosclerosis 2015; 243:477-85. [PMID: 26520903 DOI: 10.1016/j.atherosclerosis.2015.09.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/02/2015] [Accepted: 09/17/2015] [Indexed: 12/19/2022]
Abstract
The effects of angiotensin II (Ang II) on vascular smooth muscle cells (VSMC) are modulated by reactive oxygen species (ROS) and also involve integrin engagement. However, the potential link between alpha1beta1 integrin signaling with NOX system and their combined contribution to Ang II effects on VSMC have not been investigated. We aimed to elucidate the moslecular mechanisms underlying the activation of these two pathways in Ang II effects on VSMC. Ang II-induced VSMC migration (2-fold increase) and proliferation (2.5-fold increase) is modulated by alpha1beta1 integrin, being inhibited by obtustatin, a specific alpha1beta1 integrin blocker. Ang II also stimulates ROS production in VSMC (140%) that is NOX1 dependent, being completely inhibited in NOX1 silenced cells. The ROS production develops in two peaks, and the second peak is maintained by NOX2 activation. Apocynin and obtustatin inhibit the NOX2-associated second peak, but not the first peak of ROS production, which is related to NOX1 activation. Corroborating the involvement of alpha1beta1 integrin, the pretreatment of VSMC with obtustatin impaired Ang II-induced FAK phosphorylation, AKT activation, p21 degradation and the increase of ILK expression. Silencing of ILK blocked cell migration, AKT phosphorylation and the second peak of ROS, but partially inhibits (70%) VSMC proliferation induced by Ang II. The data demonstrate a novel role for NOX2 in Ang II effects on VSMC, and suggest alpha1beta1 integrin and ILK as target molecules to the development of more effective therapeutic interventions in cardiovascular diseases.
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Affiliation(s)
- João Alfredo Moraes
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
| | - Ana Clara Frony
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
| | - Aline Maria Dias
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
| | - Mariana Renovato-Martins
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
| | - Genilson Rodrigues
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
| | - Cezary Marcinkiewicz
- Department of Bioengineering, College of Engineering, Temple University, Philadelphia, PA, USA
| | - Jamil Assreuy
- Department of Pharmacology, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Christina Barja-Fidalgo
- Laboratory of Cellular and Molecular Pharmacology, Department of Cell Biology, IBRAG, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil.
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Zhang F, Hao F, An D, Zeng L, Wang Y, Xu X, Cui MZ. The matricellular protein Cyr61 is a key mediator of platelet-derived growth factor-induced cell migration. J Biol Chem 2015; 290:8232-42. [PMID: 25623072 DOI: 10.1074/jbc.m114.623074] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Platelet-derived growth factor (PDGF), a potent chemoattractant, induces cell migration via the MAPK and PI3K/Akt pathways. However, the downstream mediators are still elusive. In particular, the role of extracellular mediators is largely unknown. In this study, we identified the matricellular protein Cyr61, which is de novo synthesized in response to PDGF stimulation, as the key downstream mediator of the ERK and JNK pathways, independent of the p38 MAPK and AKT pathways, and, thereby, it mediates PDGF-induced smooth muscle cell migration but not proliferation. Our results revealed that, when Cyr61 was newly synthesized by PDGF, it was promptly translocated to the extracellular matrix and physically interacted with the plasma membrane integrins α6β1 and αvβ3. We further demonstrate that Cyr61 and integrins are integral components of the PDGF signaling pathway via an "outside-in" signaling route to activate intracellular focal adhesion kinase (FAK), leading to cell migration. Therefore, this study provides the first evidence that the PDGF-induced endogenous extracellular matrix component Cyr61 is a key mediator in modulating cell migration by connecting intracellular PDGF-ERK and JNK signals with integrin/FAK signaling. Therefore, extracellular Cyr61 convergence with growth factor signaling and integrin/FAK signaling is a new concept of growth factor-induced cell migration. The discovered signaling pathway may represent an important therapeutic target in growth factor-mediated cell migration/invasion-related vascular diseases and tumorigenesis.
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Affiliation(s)
- Fuqiang Zhang
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and the Department of Regenerative Medicine, College of Pharmacy, and
| | - Feng Hao
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and
| | - Dong An
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and College of Life Sciences, Jilin University, Changchun 130021, China
| | - Linlin Zeng
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and
| | - Yi Wang
- the Department of Regenerative Medicine, College of Pharmacy, and
| | - Xuemin Xu
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and
| | - Mei-Zhen Cui
- From the Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996 and
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10
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Heerkens EHJ, Quinn L, Withers SB, Heagerty AM. β Integrins mediate FAK Y397 autophosphorylation of resistance arteries during eutrophic inward remodeling in hypertension. J Vasc Res 2014; 51:305-14. [PMID: 25300309 PMCID: PMC4224252 DOI: 10.1159/000365479] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 06/23/2014] [Indexed: 11/19/2022] Open
Abstract
Human essential hypertension is characterized by eutrophic inward remodeling of the resistance arteries with little evidence of hypertrophy. Upregulation of αVβ3 integrin is crucial during this process. In order to investigate the role of focal adhesion kinase (FAK) activation in this process, the level of FAK Y397 autophosphorylation was studied in small blood vessels from young TGR(mRen2)27 animals as blood pressure rose and eutrophic inward remodeling took place. Between weeks 4 and 5, this process was completed and accompanied by a significant increase in FAK phosphorylation compared with normotensive control animals. Phosphorylated (p)FAK Y397 was coimmunoprecipitated with both β1- and β3-integrin-specific antibodies. In contrast, only a fraction (<10-fold) was coprecipitated with the β3 integrin subunit in control vessels. Inhibition of eutrophic remodeling by cRGDfV treatment of TGR(mRen2)27 rats resulted in the development of smooth-muscle-cell hypertrophy and a significant further enhancement of FAK Y397 phosphorylation, but this time with exclusive coassociation of pFAK Y397 with integrin β1. We established that phosphorylation of FAK Y397 with association with β1 and β3 integrins occurs with pressure-induced eutrophic remodeling. Inhibiting this process leads to an adaptive hypertrophic vascular response induced by a distinct β1-mediated FAK phosphorylation pattern.
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11
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Trayssac M, Nègre-salvayre A, Thomsen M. Mechanisms of human smooth muscle cell proliferation and transplant vasculopathy induced by HLA class I antibodies: In vitro and in vivo studies. Hum Immunol 2012; 73:1253-60. [DOI: 10.1016/j.humimm.2012.06.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 05/04/2012] [Accepted: 06/29/2012] [Indexed: 11/17/2022]
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12
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Joner M, Cheng Q, Schönhofer-Merl S, Lopez M, Neubauer S, Mas-Moruno C, Laufer B, Kolodgie FD, Kessler H, Virmani R. Polymer-free immobilization of a cyclic RGD peptide on a nitinol stent promotes integrin-dependent endothelial coverage of strut surfaces. J Biomed Mater Res B Appl Biomater 2012; 100:637-45. [DOI: 10.1002/jbm.b.31988] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 08/18/2011] [Accepted: 09/06/2011] [Indexed: 11/09/2022]
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13
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Osherov AB, Gotha L, Cheema AN, Qiang B, Strauss BH. Proteins mediating collagen biosynthesis and accumulation in arterial repair: novel targets for anti-restenosis therapy. Cardiovasc Res 2011; 91:16-26. [PMID: 21245059 DOI: 10.1093/cvr/cvr012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Events contributing to restenosis after coronary interventions include platelet aggregation, inflammatory cell infiltration, growth factor release, and accumulation of smooth muscle cells (SMCs) and extracellular matrix (ECM). The ECM is composed of various collagen subtypes and proteoglycans and over time constitutes the major component of the mature restenotic plaque. The pathophysiology of collagen accumulation in the ECM during arterial restenosis is reviewed. Factors regulating collagen synthesis and degradation, including various cytokines and growth factors involved in the process, may be targets for therapies aimed at prevention of in-stent restenosis.
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Affiliation(s)
- Azriel B Osherov
- Schulich Heart Program, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Room A-253, Toronto, Ontario, Canada M4N 3M5
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Moraes J, Assreuy J, Canetti C, Barja-Fidalgo C. Leukotriene B4 mediates vascular smooth muscle cell migration through αvβ3 integrin transactivation. Atherosclerosis 2010; 212:406-13. [DOI: 10.1016/j.atherosclerosis.2010.06.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2010] [Revised: 05/17/2010] [Accepted: 06/06/2010] [Indexed: 01/12/2023]
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15
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Li G, Jin R, Norris RA, Zhang L, Yu S, Wu F, Markwald RR, Nanda A, Conway SJ, Smyth SS, Granger DN. Periostin mediates vascular smooth muscle cell migration through the integrins alphavbeta3 and alphavbeta5 and focal adhesion kinase (FAK) pathway. Atherosclerosis 2009; 208:358-65. [PMID: 19695571 DOI: 10.1016/j.atherosclerosis.2009.07.046] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 07/23/2009] [Accepted: 07/23/2009] [Indexed: 11/30/2022]
Abstract
Smooth muscle cell (SMC) migration involves interactions of integrin receptors with extracellular matrix (ECM) and is an important process of neointimal formation in atherosclerosis and restenosis after vascular interventions. Previous studies have shown that periostin (PN), a novel ECM protein, is upregulated in rat carotid artery after balloon injury, and growth factor-stimulated expression of PN promotes SMC migration in vitro. Here, we address the mechanism by which PN-integrin interaction mediates SMC migration in vitro. Aortic SMCs isolated from PN null mice exhibited a significantly reduced ability to migrate and proliferate in vitro. Endogenous PN protein was absent and very low in the culture medium from the primary cultures of PN-/- and wildtype SMCs, respectively. In both types of SMCs, adenovirus-mediated overexpression of HA-tagged PN to a similar extent, which induced a robust cell migration concomitantly with an increase in beta3-integrin expression and phosphorylation of FAK (Tyr397). Furthermore, in cultured human SMCs, specific integrin blocking antibodies showed that interactions of PN-alphanubeta3 and PN-alphanubeta5, but not PN-beta1 integrins, are required for SMC migration. Inhibition of FAK signaling by overexpression of an endogenous FAK inhibitor termed FRNK (FAK-related nonkinase) significantly attenuated FAK (Tyr397) phosphorylation and the SMC migration induced by PN. These results reveal a mechanism whereby PN mediates vascular SMC migration through an interaction with alphaV-integrins (mainly alphanubeta3) and subsequent activation of FAK pathway.
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Affiliation(s)
- Guohong Li
- Department of Neurosurgery, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA, United States.
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16
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Ribichini F, Joner M, Ferrero V, Finn AV, Crimins J, Nakazawa G, Acampado E, Kolodgie FD, Vassanelli C, Virmani R. Effects of Oral Prednisone After Stenting in a Rabbit Model of Established Atherosclerosis. J Am Coll Cardiol 2007; 50:176-85. [PMID: 17616304 DOI: 10.1016/j.jacc.2007.03.031] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 03/02/2007] [Accepted: 03/06/2007] [Indexed: 11/20/2022]
Abstract
OBJECTIVES The aim of this study was to compare the effects of systemic prednisone in combination with a bare-metal stent (BMS) or a paclitaxel-eluting stent (Taxus, Boston Scientific Corp., Natick, Massachusetts) on neointimal inhibition and vessel healing in an atherosclerotic rabbit model. BACKGROUND Inflammation plays a critical role in neointimal formation after coronary artery stenting. The efficacy of immunosuppressive doses of oral prednisone to inhibit in-stent neointimal proliferation was compared with BMS and with a commercially available paclitaxel-eluting stent (Taxus) in a rabbit model of established atherosclerosis. METHODS Bilateral iliac artery injury in atherosclerotic New Zealand White rabbits fed an atherogenic diet was followed by stent implantation. Animals randomly received Taxus stents, BMS (Express, Boston Scientific Corp.) and placebo, or BMS and oral prednisone (2.1 mg/kg/day for the first 7 days, followed by 1.4 mg/kg/day for 14 days and 0.7 mg/kg/day for 21 days). Stented arterial segments were harvested at 42 days and processed for light microscopy, immunohistochemistry, and organoid culture. RESULTS Compared with control subjects, prednisone-treated animals showed a 30% reduction in percent stenosis (p = 0.009), a 35% decrease in neointimal area (p < 0.003), and a 66% decrement in neointimal thickness (p < 0.001). Taxus stents also reduced all 3 parameters significantly (-34%, -39%, and -83%, respectively), but showed significantly more inflammatory cells and fibrin deposition and less endothelialization compared with the other 2 groups. Plaque burden was equal among groups, as shown by the identical stent and vessel area, and no remodeling was observed. CONCLUSIONS Systemic prednisone treatment and Taxus stents reduce neointimal formation compared with BMS. The extent of neointimal reduction is similar between prednisone- and Taxus stent-treated animals; however, Taxus stents resulted in a significantly greater delay in healing. Targeting of inflammatory pathways after percutaneous coronary intervention may be an efficacious way to prevent restenosis without the long-term risk of late thrombosis.
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Affiliation(s)
- Flavio Ribichini
- Division of Cardiology of the Università di Verona, Ospedale Civile Maggiore, Verona, Italy
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Abstract
Atherosclerotic plaque rupture, with subsequent occlusive thrombosis, is the underlying cause of most cases of sudden cardiac death. Matrix metalloproteinases (MMPs) are thought to mediate the progression of stable atherosclerotic lesions to an unstable phenotype that is prone to rupture through the destruction of strength-giving extracellular matrix (ECM) proteins. Smooth muscle cells secrete and deposit ECM proteins and are, therefore, considered protective against atherosclerotic plaque destabilization. However, similar to inflammatory cells (e.g., macrophages), smooth muscle cells release numerous MMPs that are capable of digesting ECM proteins. Thus, the interaction of smooth muscle cells and MMPs in atherosclerotic plaques is complex and not fully understood. Recently, research into the roles of MMPs and their endogenous inhibitors (tissue inhibitors of metalloproteinases), and their effects on smooth muscle behavior during plaque destabilization has been aided by the development of reproducible animal models of plaque instability. A plethora of studies has demonstrated that MMPs directly modulate smooth muscle behavior with both beneficial and deleterious effects on atherosclerotic plaque stability, in addition to their canonical effects on ECM remodeling. Consequently, broad-spectrum MMP inhibition may inhibit plaque-stabilizing mechanisms, such as smooth muscle cell growth, while conversely retarding ECM destruction and subsequent rupture. Hence the development of selective MMP inhibitors, that spare inhibitory effects on smooth muscle cell function, may be useful therapies to prevent plaque rupture and in this regard MMP-12 appears to be a particularly attractive target.
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Affiliation(s)
- Jason Lee Johnson
- University of Bristol, Bristol Heart Institute, Level 7, Bristol Royal Infirmary, Marlborough Street, Bristol, BS2 8HW, UK.
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Affiliation(s)
- Egidius H J Heerkens
- Division of Cardiovascular and Endocrine Sciences, Faculty of Medical and Human Sciences, University of Manchester, United Kingdom
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Abstract
Integrins were first described just over 20 years ago and have been studied in the cornea by many groups interested in how the cornea functions in health and disease. There are a minimum of 12 different integrin heterodimers reported to be expressed by the major resident cells of the cornea: the corneal and limbal epithelial cells, keratocytes/fibroblasts, and corneal endothelial cells. These different integrin heterodimers play important and varied roles in maintaining the cornea and organizing how its cells interact with their surrounding extracellular matrix to maintain corneal clarity. In this review, an overview of the discovery and functions of integrins is provided along with a description of the current state of our knowledge of this large family of important proteins. While we have learned a lot about corneal integrins over the past 20 years, there is still much to learn. Areas where gaps in our knowledge of integrin functions in the cornea are slowing our progress in understanding corneal diseases and dystrophies at a molecular level are highlighted.
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Affiliation(s)
- Mary Ann Stepp
- Department of Anatomy, The George Washington University Medical Center, 2300 I Street N.W., Washington, DC 20037, USA.
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Abstract
AIM: To construct the retroviral vector of p125FAK specific ribozyme genes and to explore the feasibility of ribozyme in BGC-823 gene therapy in vitro.
METHODS: A hammerhead ribozyme DNA targeting p125FAK mRNA from nt 1010 to nt 1032 was synthesized and recombinated into the retroviral vector pLXSN forming pLRZXSN recon. Using the lipofectin-mediated DNA transfection technique, pLRZXSN was introduced into BGC-823 cells. The effects of ribozyme on the growth of BGC-823 cells and apoptosis were studied by cell colony assay, flow cytometry (FCM), reverse transcriptase-polymerase chain reaction (RT-PCR), detection of DNA fragmentation and electron microscopy.
RESULTS: The number of BGC-823 cell colonies was inhibited by 56% after the cells were treated for 48 h. The cell proliferation was inhibited effectively by p125FAK ribozyme and the inhibitory effect depended on the concentration and the time of incubation. The expression of p125FAK mRNA and protein P125 decreased sharply in BGC-823 cells treated with p125FAK ribozyme. The characteristics of apoptosis, namely sub-G1 peak, DNA fragmentation and morphological changes, were revealed in BGC-823 cells treated with p125FAK ribozyme.
CONCLUSION: p125FAK ribozyme decreases p125FAK gene expression and induces apoptosis of human gastric cancer cells in vitro.
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Affiliation(s)
- Guo-Xian Guan
- Department of Oncology, Affiliated Union Hospital, Fujian Medical University, Fuzhou 350001, Fujian Province, China.
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Wu RX, Laser M, Han H, Varadarajulu J, Schuh K, Hallhuber M, Hu K, Ertl G, Hauck CR, Ritter O. Fibroblast migration after myocardial infarction is regulated by transient SPARC expression. J Mol Med (Berl) 2006; 84:241-52. [PMID: 16416312 DOI: 10.1007/s00109-005-0026-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2005] [Accepted: 10/27/2005] [Indexed: 11/26/2022]
Abstract
Secreted protein, acidic, and rich in cysteine (SPARC) is thought to regulate cell matrix interaction during wound repair. We hypothesized that SPARC might promote migration via integrin-dependent mechanisms. The present study was designed to clarify the contribution of SPARC in the wound healing process after myocardial infarction (MI). Adult mice received a specific alpha(v) integrin inhibitor or vehicle through osmotic mini pumps. Mice of each group were either sham-operated or MI was induced. SPARC expression was investigated 2 days, 7 days, and 1 month after the surgical procedure. For migration assays, a modified Boyden chamber assay was used. A transient increase of SPARC levels was observed, starting at day 2 (2.55+/-0.21), day 7 (3.72+/-0.28), and 1 month (1.9+/-0.16) after MI. After 2 months, SPARC expression dropped back to normal levels compared to sham-operated hearts. Immunofluorescence analysis showed an increase of SPARC in the infarcted area 2 days after MI, a strong increase in the scar area 7 days after MI, and only low levels in the scar area 2 months after MI. Integrin alpha(v) inhibition abolished the up-regulation of SPARC. In vitro migration assays demonstrated that fibronectin-stimulated haptotaxis of fibroblasts was modulated by SPARC. This study provides evidence that SPARC is significantly up-regulated in the infarcted region after MI. This up-regulation is dependent on alpha(v) integrins. As SPARC is found to regulate fibroblast migration, it appears to play an important role in the injured myocardium with regard to healing and scar formation.
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Affiliation(s)
- Rong Xue Wu
- Department of Medicine I, Center for Cardiovascular Medicine, University of Würzburg, Josef-Schneider-Str. 2, 97080 Würzburg, Germany
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