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Lai Y, Gao FF, Ge RT, Liu R, Ma S, Liu X. Metal ions overloading and cell death. Cell Biol Toxicol 2024; 40:72. [PMID: 39162885 PMCID: PMC11335907 DOI: 10.1007/s10565-024-09910-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Accepted: 08/06/2024] [Indexed: 08/21/2024]
Abstract
Cell death maintains cell morphology and homeostasis during development by removing damaged or obsolete cells. The concentration of metal ions whithin cells is regulated by various intracellular transporters and repositories to maintain dynamic balance. External or internal stimuli might increase the concentration of metal ions, which results in ions overloading. Abnormal accumulation of large amounts of metal ions can lead to disruption of various signaling in the cell, which in turn can produce toxic effects and lead to the occurrence of different types of cell deaths. In order to further study the occurrence and development of metal ions overloading induced cell death, this paper reviewed the regulation of Ca2+, Fe3+, Cu2+ and Zn2+ metal ions, and the internal mechanism of cell death induced by overloading. Furthermore, we found that different metal ions possess a synergistic and competitive relationship in the regulation of cell death. And the enhanced level of oxidative stress was present in all the processes of cell death due to metal ions overloading, which possibly due to the combination of factors. Therefore, this review offers a theoretical foundation for the investigation of the toxic effects of metal ions, and presents innovative insights for targeted regulation and therapeutic intervention. HIGHLIGHTS: • Metal ions overloading disrupts homeostasis, which in turn affects the regulation of cell death. • Metal ions overloading can cause cell death via reactive oxygen species (ROS). • Different metal ions have synergistic and competitive relationships for regulating cell death.
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Affiliation(s)
- Yun Lai
- School of Public Health, Wenzhou Medical University, Wenzhou, China
| | - Fen Fen Gao
- School of Public Health, Wenzhou Medical University, Wenzhou, China
| | - Ruo Ting Ge
- School of Public Health, Wenzhou Medical University, Wenzhou, China
| | - Rui Liu
- School of Public Health, Wenzhou Medical University, Wenzhou, China
| | - Shumei Ma
- School of Public Health, Wenzhou Medical University, Wenzhou, China.
| | - Xiaodong Liu
- School of Public Health, Wenzhou Medical University, Wenzhou, China.
- South Zhejiang Institute of Radiation Medicine and Nuclear Technology, Wenzhou Medical University, Wenzhou, China.
- Key Laboratory of Watershed Science and Health of Zhejiang Province, Wenzhou Medical University, Wenzhou, China.
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Geh EN, Swertfeger DK, Sexmith H, Heink A, Tarapore P, Melchior JT, Davidson WS, Shah AS. A novel assay to measure low-density lipoproteins binding to proteoglycans. PLoS One 2024; 19:e0291632. [PMID: 38295021 PMCID: PMC10830033 DOI: 10.1371/journal.pone.0291632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 09/04/2023] [Indexed: 02/02/2024] Open
Abstract
BACKGROUND The binding of low-density lipoprotein (LDL) to proteoglycans (PGs) in the extracellular matrix (ECM) of the arterial intima is a key initial step in the development of atherosclerosis. Although many techniques have been developed to assess this binding, most of the methods are labor-intensive and technically challenging to standardize across research laboratories. Thus, sensitive, and reproducible assay to detect LDL binding to PGs is needed to screen clinical populations for atherosclerosis risk. OBJECTIVES The aim of this study was to develop a quantitative, and reproducible assay to evaluate the affinity of LDL towards PGs and to replicate previously published results on LDL-PG binding. METHODS Immunofluorescence microscopy was performed to visualize the binding of LDL to PGs using mouse vascular smooth muscle (MOVAS) cells. An in-cell ELISA (ICE) was also developed and optimized to quantitatively measure LDL-PG binding using fixed MOVAS cells cultured in a 96-well format. RESULTS We used the ICE assay to show that, despite equal APOB concentrations, LDL isolated from adults with cardiovascular disease bound to PG to a greater extent than LDL isolated from adults without cardiovascular disease (p<0.05). CONCLUSION We have developed an LDL-PG binding assay that is capable of detecting differences in PG binding affinities despite equal APOB concentrations. Future work will focus on candidate apolipoproteins that enhance or diminish this interaction.
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Affiliation(s)
- Esmond N. Geh
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center & the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Debi K. Swertfeger
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center & the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Hannah Sexmith
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center & the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Anna Heink
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center & the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Pheruza Tarapore
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - John T. Melchior
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio, United States of America
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, United States of America
- Department of Neurology, Oregon Health and Science University, Portland, Oregon, United States of America
| | - W. Sean Davidson
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Amy Sanghavi Shah
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center & the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
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Lin Y, Sun Z. Klotho deficiency-induced arterial calcification involves osteoblastic transition of VSMCs and activation of BMP signaling. J Cell Physiol 2022; 237:720-729. [PMID: 34368951 PMCID: PMC8810603 DOI: 10.1002/jcp.30541] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 07/07/2021] [Accepted: 07/24/2021] [Indexed: 01/03/2023]
Abstract
Klotho is an aging-suppressor gene. The purpose of this study was to investigate whether Klotho deficiency affects arterial structure. We found that Klotho-deficient (kl/kl) mice developed severe arterial calcification and elastin fragmentation. Klotho-deficient mice demonstrated higher levels of bone morphogenetic proteins (BMP2, BMP4) and runt-related transcription factor 2 (RUNX2) in aortas, indicating that Klotho deficiency upregulates expression of BMP2 and RUNX2 (a key transcription factor in osteoblasts). To exclude the potential involvement of hyperphosphatemia in arterial calcification, Klotho-deficient mice were given a low phosphate diet (0.2%). The low phosphate diet normalized blood phosphate levels and abolished calcification in the lungs and kidneys, but it did not prevent calcification in the aortas in Klotho-deficient mice. Thus, Klotho deficiency per se might play a causal role in the pathogenesis of arterial calcification, which is independent of hyperphosphatemia. In cultured mouse aortic smooth muscle cells (ASMCs), Klotho-deficient serum-induced transition of ASMCs to osteoblasts. Klotho-deficient serum promoted BMP2/vitamin D3-induced protein expression of PIT2 and RUNX2, phosphorylation of SMAD1/5/8 and SMAD2/3, and extracellular matrix calcification. Interestingly, treatments with recombinant Klotho protein abolished BMP2/vitamin D3-induced osteoblastic transition and morphogenesis and calcification. Therefore, Klotho is a critical regulator in the maintenance of normal arterial homeostasis. Klotho deficiency-induced arterial calcification is an active process that involves the osteoblastic transition of SMCs and activation of the BMP2-RUNX2 signaling.
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Affiliation(s)
- Yi Lin
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK73104, USA
| | - Zhongjie Sun
- Department of Physiology, College of Medicine, University of Tennessee Health Sciences Center, Memphis, TN 73136, USA,Address Correspondence to: Zhongjie Sun, MD, PhD, FAHA, Professor and Chair, Department of Physiology, University of Tennessee HSC, C302B Coleman Bldg., 956 Court Ave., Memphis, TN 38163-2116, USA, Tel. 901-448-2679,
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Characterization of murine cytomegalovirus infection and induction of calcification in Murine Aortic Vascular Smooth Muscle Cells (MOVAS). J Virol Methods 2021; 297:114270. [PMID: 34461152 DOI: 10.1016/j.jviromet.2021.114270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/24/2021] [Accepted: 08/25/2021] [Indexed: 02/06/2023]
Abstract
Human cytomegalovirus (HCMV) is a widespread pathogen that causes lifelong latent infection in the majority of the world population. HCMV is associated with increased incidence and severity of many cardiovascular diseases including myocarditis, atherosclerosis, and transplant vasculopathy. Due to the species-restricted nature of cytomegalovirus infection, murine cytomegalovirus (MCMV) is a useful model that recapitulates many of the features of HCMV infection of the cardiovascular system. While in vivo MCMV studies are able to answer many questions regarding pathogenesis of infection, in vitro experiments using cell lines are useful tools to further understand the potential underlying mechanisms. In this study, we characterize MCMV infection of the murine aortic smooth muscle cell line (MOVAS). Our findings demonstrate that MOVAS cells are permissive for MCMV infection, form plaques under carboxymethyl cellulose overlay, and produce progeny virus similar to NIH 3T3 murine embryonic fibroblasts. In addition, MCMV infection induces calcification in MOVAS cells similar to that seen in the epicardium of MCMV-infected hearts. We conclude that MOVAS cells are a useful in vitro tool for studying CMV-mediated cardiac calcification.
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Awuah Boadi E, Shin S, Bandyopadhyay BC. Tannic acid attenuates vascular calcification-induced proximal tubular cells damage through paracrine signaling. Biomed Pharmacother 2021; 140:111762. [PMID: 34126317 PMCID: PMC8753424 DOI: 10.1016/j.biopha.2021.111762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 05/11/2021] [Accepted: 05/19/2021] [Indexed: 01/14/2023] Open
Abstract
Vascular calcification is common in chronic kidney disease; however, the extent to which such condition can affect the renal microvasculature and the neighboring cell types is unclear. Our induced-calcification model in renal proximal tubular (PT) cells exhibited endoplasmic reticulum (ER) stress and oxidative damage, leading to apoptosis. Here, we utilized such calcification in mouse vascular smooth muscle (MOVAS-1) cells as a vascular calcification model, because it exhibited reactive oxygen species (ROS) generation, ER and oxidative stress, inflammatory, and apoptotic gene expressions. To demonstrate whether the vascular calcification condition can dictate the function of the adjacent PT cell layer, we utilized a Transwell multilayer culture system by combining those MOVAS-1 cells in the bottom chamber and polarized PT cells in the upper chamber to show the dimensional cross-signaling effect. Interestingly, calcification of MOVAS-1 cells, in this co-culture, induced H2O2 and lactate dehydrogenase (LDH) release leading to store-operated Ca2+ entry, ROS generation, and activation of oxidative, inflammatory, and apoptotic gene expressions in PT cells through paracrine signaling. Interestingly, application of tannic acid (TA) to either calcified MOVAS-1 or uncalcified PT cells diminished such detrimental pathway activation. Furthermore, the TA-mediated protection was much higher in the PT cells when applied on the calcified MOVAS-1 cells, and the delayed the pathological effects in neighboring PT cells can well be via paracrine signaling. Together, these results provide evidence of vascular calcification-induced PT cell damage, and the protective role of TA in preventing such pathological consequences, which can potentially be used as a nephroprotective remedy.
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Affiliation(s)
- Eugenia Awuah Boadi
- Calcium Signaling Laboratory, Research Service, Veterans Affairs Medical Center, 50 Irving Street, Washington DC 20422, NW, USA
| | - Samuel Shin
- Calcium Signaling Laboratory, Research Service, Veterans Affairs Medical Center, 50 Irving Street, Washington DC 20422, NW, USA
| | - Bidhan C Bandyopadhyay
- Calcium Signaling Laboratory, Research Service, Veterans Affairs Medical Center, 50 Irving Street, Washington DC 20422, NW, USA; Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University, Washington DC 20037, USA; Department of Biomedical Engineering, The Catholic University of America, 620 Michigan Avenue, Washington DC 20064, NE, USA.
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Shih YC, Chen PY, Ko TM, Huang PH, Ma H, Tarng DC. MMP-9 Deletion Attenuates Arteriovenous Fistula Neointima through Reduced Perioperative Vascular Inflammation. Int J Mol Sci 2021; 22:ijms22115448. [PMID: 34064140 PMCID: PMC8196691 DOI: 10.3390/ijms22115448] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/15/2021] [Accepted: 05/18/2021] [Indexed: 01/05/2023] Open
Abstract
Matrix metalloproteinase 9 (MMP-9) expression is upregulated in vascular inflammation and participates in vascular remodeling, including aneurysm dilatation and arterial neointima development. Neointima at the arteriovenous (AV) fistula anastomosis site primarily causes AV fistula stenosis and failure; however, the effects of MMP-9 on perioperative AV fistula remodeling remain unknown. Therefore, we created AV fistulas (end-to-side anastomosis) in wild-type (WT) and MMP-9 knockout mice with chronic kidney disease to further clarify this. Neointima progressively developed in the AV fistula venous segment of WT mice during the four-week postoperative course, and MMP-9 knockout increased the lumen area and attenuated neointima size by reducing smooth muscle cell and collagen components. Early perioperative AV fistula mRNA sequencing data revealed that inflammation-related gene sets were negatively enriched in AV fistula of MMP-9 knockout mice compared to that in WT mice. qPCR results also showed that inflammatory genes, including tumor necrosis factor-α (TNF-α), monocyte chemoattractant protein-1 (MCP-1), interleukin-6 (IL-6), intercellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1), were downregulated. In addition, Western blot results showed that MMP-9 knockout reduced CD44 and RAC-alpha serine/threonine-protein kinase (Akt) and extracellular signal-regulated kinases (ERK) phosphorylation. In vitro, MMP-9 addition enhanced IL-6 and MCP-1 expression in vascular smooth muscle cells, as well as cell migration, which was reversed by an MMP-9 inhibitor. In conclusion, MMP-9 knockout attenuated AV fistula stenosis by reducing perioperative vascular inflammation.
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Affiliation(s)
- Yu-Chung Shih
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei 11217, Taiwan; (Y.-C.S.); (H.M.)
- Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan;
- Institute of Clinical Medicine, National Yang Ming University, Taipei 11221, Taiwan
- Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Po-Yuan Chen
- Bioinformatics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan; (P.-Y.C.); (T.-M.K.)
- Institute of Bioinformatics and Systems Biology, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Institute of Information Science, Academia Sinica, Taipei 115, Taiwan
| | - Tai-Ming Ko
- Bioinformatics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan; (P.-Y.C.); (T.-M.K.)
- Institute of Bioinformatics and Systems Biology, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan
- Center of Intelligent Drug System and Smart Bio-devices (IDS2B), National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
| | - Po-Hsun Huang
- Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan;
- Institute of Clinical Medicine, National Yang Ming University, Taipei 11221, Taiwan
- Department of Critical Care Medicine, Taipei Veterans General Hospital, Taipei 11217, Taiwan
| | - Hsu Ma
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei 11217, Taiwan; (Y.-C.S.); (H.M.)
- Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
- Department of Surgery, School of Medicine, National Defense Medical Center, Taipei 11490, Taiwan
| | - Der-Cherng Tarng
- Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan;
- Institute of Clinical Medicine, National Yang Ming University, Taipei 11221, Taiwan
- Division of Nephrology, Department of Medicine, Taipei Veterans General Hospital, Taipei 11217, Taiwan
- Institute of Physiology, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
- Correspondence:
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Socorro M, Shinde A, Yamazaki H, Khalid S, Monier D, Beniash E, Napierala D. Trps1 transcription factor represses phosphate-induced expression of SerpinB2 in osteogenic cells. Bone 2020; 141:115673. [PMID: 33022456 PMCID: PMC7680451 DOI: 10.1016/j.bone.2020.115673] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 09/24/2020] [Accepted: 09/29/2020] [Indexed: 12/13/2022]
Abstract
Serine protease inhibitor SerpinB2 is one of the most upregulated proteins following cellular stress. This multifunctional serpin has been attributed a number of pleiotropic activities, including roles in cell survival, proliferation, differentiation, immunity and extracellular matrix (ECM) remodeling. Studies of cancer cells demonstrated that expression of SerpinB2 is directly repressed by the Trps1 transcription factor, which is a regulator of skeletal and dental tissues mineralization. In our previous studies, we identified SerpinB2 as one of the novel genes highly upregulated by phosphate (Pi) at the initiation of the mineralization process, however SerpinB2 has never been implicated in formation nor homeostasis of mineralized tissues. The aim of this study was to establish, if SerpinB2 is involved in function of cells producing mineralized ECM and to determine the interplay between Pi signaling and Trps1 in the regulation of SerpinB2 expression specifically in cells producing mineralized ECM. Analyses of the SerpinB2 expression pattern in mouse skeletal and dental tissues detected high SerpinB2 protein levels specifically in cells producing mineralized ECM. qRT-PCR and Western blot analyses demonstrated that SerpinB2 expression is activated by elevated Pi specifically in osteogenic cells. However, the Pi-induced SerpinB2 expression was diminished by overexpression of Trps1. Decreased SerpinB2 levels were also detected in osteoblasts and odontoblasts of 2.3Col1a1-Trps1 transgenic mice. Chromatin immunoprecipitation assay (ChIP) revealed that the occupancy of Trps1 on regulatory elements in the SerpinB2 gene changes in response to Pi. In vitro functional assessment of the consequences of SerpinB2 deficiency in cells producing mineralized ECM detected impaired mineralization in SerpinB2-deficient cells in comparison with controls. In conclusion, high and specific expression of SerpinB2 in cells producing mineralized ECM, the impaired mineralization of SerpinB2-deficient cells and regulation of SerpinB2 expression by two molecules regulating formation of mineralized tissues suggest involvement of SerpinB2 in physiological mineralization.
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Affiliation(s)
- Mairobys Socorro
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - Apurva Shinde
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - Hajime Yamazaki
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - Sana Khalid
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - Daisy Monier
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - Elia Beniash
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Dobrawa Napierala
- Center for Craniofacial Regeneration, Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
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Dingwell LS, Shikatani EA, Besla R, Levy AS, Dinh DD, Momen A, Zhang H, Afroze T, Chen MB, Chiu F, Simmons CA, Billia F, Gommerman JL, John R, Heximer S, Scholey JW, Bolz SS, Robbins CS, Husain M. B-Cell Deficiency Lowers Blood Pressure in Mice. Hypertension 2019; 73:561-570. [DOI: 10.1161/hypertensionaha.118.11828] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Luke S. Dingwell
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
- Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre (L.S.D., E.A.S., C.S.R., M.H.), University of Toronto, Canada
- Department of the Institute of Medical Science (L.S.D., M.H.), University of Toronto, Canada
| | - Eric A. Shikatani
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
- Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre (L.S.D., E.A.S., C.S.R., M.H.), University of Toronto, Canada
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
| | - Rickvinder Besla
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
| | - Andrew S. Levy
- Department of Physiology (A.S.L., D.D.D., H.Z., S.H., J.W.S., S.-S.B., M.H.), University of Toronto, Canada
| | - Danny D. Dinh
- Department of Physiology (A.S.L., D.D.D., H.Z., S.H., J.W.S., S.-S.B., M.H.), University of Toronto, Canada
| | - Abdul Momen
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
| | - Hangjun Zhang
- Department of Physiology (A.S.L., D.D.D., H.Z., S.H., J.W.S., S.-S.B., M.H.), University of Toronto, Canada
| | - Talat Afroze
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
| | - Michelle B. Chen
- Department of Mechanical and Industrial Engineering (M.B.C., C.A.S.), University of Toronto, Canada
| | - Felix Chiu
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
| | - Craig A. Simmons
- Department of Mechanical and Industrial Engineering (M.B.C., C.A.S.), University of Toronto, Canada
| | - Filio Billia
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
| | | | - Rohan John
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
| | - Scott Heximer
- Department of Physiology (A.S.L., D.D.D., H.Z., S.H., J.W.S., S.-S.B., M.H.), University of Toronto, Canada
| | - James W. Scholey
- Department of Mechanical and Industrial Engineering (M.B.C., C.A.S.), University of Toronto, Canada
| | - Steffen-Sebastian Bolz
- Department of Mechanical and Industrial Engineering (M.B.C., C.A.S.), University of Toronto, Canada
| | - Clinton S. Robbins
- Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre (L.S.D., E.A.S., C.S.R., M.H.), University of Toronto, Canada
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
- Department of Immunology (J.L.G., C.S.R.), University of Toronto, Canada
| | - Mansoor Husain
- From the Toronto General Hospital Research Institute, University Health Network, Canada (L.S.D., E.A.S., A.M., T.A., F.B., M.H.)
- Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre (L.S.D., E.A.S., C.S.R., M.H.), University of Toronto, Canada
- Department of the Institute of Medical Science (L.S.D., M.H.), University of Toronto, Canada
- Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., F.C., R.J., C.S.R., M.H.), University of Toronto, Canada
- Department of Physiology (A.S.L., D.D.D., H.Z., S.H., J.W.S., S.-S.B., M.H.), University of Toronto, Canada
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9
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Sim AM, Rashdan NA, Cui L, Moss AJ, Nudelman F, Dweck MR, MacRae VE, Hulme AN. A novel fluorescein-bisphosphonate based diagnostic tool for the detection of hydroxyapatite in both cell and tissue models. Sci Rep 2018; 8:17360. [PMID: 30478332 PMCID: PMC6255785 DOI: 10.1038/s41598-018-35454-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 11/01/2018] [Indexed: 02/06/2023] Open
Abstract
A rapid and efficient method for the detection of hydroxyapatite (HAP) has been developed which shows superiority to existing well-established methods. This fluorescein-bisphosphonate probe is highly selective for HAP over other calcium minerals and is capable of detecting lower levels of calcification in cellular models than either hydrochloric acid-based calcium leaching assays or the Alizarin S stain. The probe has been shown to be effective in both in vitro vascular calcification models and in vitro bone calcification models. Moreover we have demonstrated binding of this probe to vascular calcification in rat aorta and to areas of microcalcification, in human vascular tissue, beyond the resolution of computed tomography in human atherosclerotic plaques. Fluorescein-BP is therefore a highly sensitive and specific imaging probe for the detection of vascular calcification, with the potential to improve not only ex vivo assessments of HAP deposition but also the detection of vascular microcalcification in humans.
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Affiliation(s)
- Alisia M Sim
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK
- The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK
- Centre for Cardiovascular Science, University of Edinburgh, Chancellor's Building, Edinburgh, EH16 4UU, UK
| | - Nabil A Rashdan
- The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK
| | - Lin Cui
- The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK
| | - Alastair J Moss
- Centre for Cardiovascular Science, University of Edinburgh, Chancellor's Building, Edinburgh, EH16 4UU, UK
| | - Fabio Nudelman
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Marc R Dweck
- Centre for Cardiovascular Science, University of Edinburgh, Chancellor's Building, Edinburgh, EH16 4UU, UK
| | - Vicky E MacRae
- The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK
| | - Alison N Hulme
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
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10
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Chandy M, Ishida M, Shikatani EA, El-Mounayri O, Park LC, Afroze T, Wang T, Marsden PA, Husain M. c-Myb regulates transcriptional activation of miR-143/145 in vascular smooth muscle cells. PLoS One 2018; 13:e0202778. [PMID: 30169548 PMCID: PMC6118359 DOI: 10.1371/journal.pone.0202778] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 08/08/2018] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND MicroRNAs (miR) are small non-coding RNAs that regulate diverse biological functions. The bicistronic gene miR-143/145 determines cell fate and phenotype of vascular smooth muscle cells (VSMC), in part, by destabilizing Elk-1 mRNA. The transcription factor c-Myb also regulates differentiation and proliferation of VSMC, and here we test whether these effects may be mediated by miR-143/145. METHODS & RESULTS Flow cytometry of cardiovascular-directed d3.75 embryoid bodies (EBs) isolated smooth muscle progenitors with specific cell surface markers. In c-myb knockout (c-myb -/-) EB, these progenitors manifest low levels of miR-143 (19%; p<0.05) and miR-145 (6%; p<0.01) expression as compared to wild-type (wt) EB. Primary VSMC isolated from transgenic mice with diminished expression (c-myblx/lx) or reduced activity (c-mybh/h) of c-Myb also manifest low levels of miR-143 (c-myblx/lx: 50%; c-mybh/h: 41%), and miR-145 (c-myblx/lx: 49%; c-mybh/h: 56%), as compared to wt (P<0.05). Sequence alignment identified four putative c-Myb binding sites (MBS1-4) in the proximal promoter (PP) of the miR-143/145 gene. PP-reporter constructs revealed that point mutations in MBS1 and MBS4 abrogated c-Myb-dependent transcription from the miR-143/145 PP (P<0.01). Chromatin immunoprecipitation (ChIP) revealed preferential c-Myb binding at MBS4 (p<0.001). By conjugating Elk-1 3'-untranslated region (UTR) to a reporter and co-transducing wt VSMC with this plus a miR-143-antagomir, and co-transducing c-myblx/lx VSMC with this plus a miR-143-mimic, we demonstrate that c-Myb's ability to repress Elk-1 is mediated by miR-143. CONCLUSION c-Myb regulates VSMC gene expression by transcriptional activation of miR-143/145.
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Affiliation(s)
- Mark Chandy
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Masayoshi Ishida
- Department of Physiology & Regenerative Medicine, Faculty of Medicine, Kindai University, Osaka-Sayama, Japan
| | - Eric A. Shikatani
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
| | - Omar El-Mounayri
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
| | - Lawrence Changsu Park
- Li Ka Shing Knowledge Translation Institute, St. Michael’s Hospital, Toronto, Canada (LCP)
| | - Talat Afroze
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
| | - Tao Wang
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
- Departments of Physiology, University of Toronto, Toronto, Canada
| | - Philip A. Marsden
- Department of Medicine, University of Toronto, Toronto, Canada
- Li Ka Shing Knowledge Translation Institute, St. Michael’s Hospital, Toronto, Canada (LCP)
| | - Mansoor Husain
- Ted Rogers Centre for Heart Research, University Health Network, Toronto, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
- Departments of Physiology, University of Toronto, Toronto, Canada
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11
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Tsang HG, Cui L, Farquharson C, Corcoran BM, Summers KM, Macrae VE. Exploiting novel valve interstitial cell lines to study calcific aortic valve disease. Mol Med Rep 2018; 17:2100-2106. [PMID: 29207136 PMCID: PMC5783449 DOI: 10.3892/mmr.2017.8163] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 08/14/2017] [Indexed: 01/07/2023] Open
Abstract
Calcific aortic valve disease (CAVD) involves progressive valve leaflet thickening and severe calcification, impairing leaflet motion. The in vitro calcification of primary rat, human, porcine and bovine aortic valve interstitial cells (VICs) is commonly employed to investigate CAVD mechanisms. However, to date, no published studies have utilised cell lines to investigate this process. The present study has therefore generated and evaluated the calcification potential of immortalized cell lines derived from sheep and rat VICs. Immortalised sheep (SAVIC) and rat (RAVIC) cell lines were produced by transduction with a recombinant lentivirus encoding the Simian virus (SV40) large and small T antigens (sheep), or large T antigen only (rat), which expressed markers of VICs (vimentin and α‑smooth muscle actin). Calcification was induced in the presence of calcium (Ca; 2.7 mM) in SAVICs (1.9 fold; P<0.001) and RAVICs (4.6 fold; P<0.01). Furthermore, a synergistic effect of calcium and phosphate was observed (2.7 mM Ca/2.0 mM Pi) on VIC calcification in the two cell lines (P<0.001). Analysis of SAVICs revealed significant increases in the mRNA expression of two key genes associated with vascular calcification in cells cultured under calcifying conditions, runt related transcription factor‑2 (RUNX2;1.3 fold; P<0.05 in 4.5 mM Ca) and sodium‑dependent phosphate transporter‑1 (PiT1; 1.2 fold; P<0.05 in 5.4 mM Ca). A concomitant decrease in the expression of the calcification inhibitor matrix Gla protein (MGP) was noted at 3.6 mM Ca (1.3 fold; P<0.01). Assessment of RAVICs revealed alterations in Runx2, Pit1 and Mgp mRNA expression levels (P<0.01). Furthermore, a significant reduction in calcification was observed in SAVICs following treatment with established calcification inhibitors, pyrophosphate (1.8 fold; P<0.01) and etidronate (3.2 fold; P<0.01). Overall, the present study demonstrated that the use of immortalised sheep and rat VIC cell lines is a convenient and cost effective system to investigate CAVD in vitro, and will make a useful contribution to increasing current understanding of the pathophysiological process.
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Affiliation(s)
- Hiu-Gwen Tsang
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
| | - Lin Cui
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
| | - Colin Farquharson
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
| | - Brendan M. Corcoran
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
| | - Kim M. Summers
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
| | - Vicky E. Macrae
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, UK
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12
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Lewis S, Little R, Baudoin F, Prehar S, Neyses L, Cartwright EJ, Austin C. Acute inhibition of PMCA4, but not global ablation, reduces blood pressure and arterial contractility via a nNOS-dependent mechanism. J Cell Mol Med 2017; 22:861-872. [PMID: 29193716 PMCID: PMC5783868 DOI: 10.1111/jcmm.13371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 07/28/2017] [Indexed: 12/30/2022] Open
Abstract
Cardiovascular disease is the world's leading cause of morbidity and mortality, with high blood pressure (BP) contributing to increased severity and number of adverse outcomes. Plasma membrane calcium ATPase 4 (PMCA4) has been previously shown to modulate systemic BP. However, published data are conflicting, with both overexpression and inhibition of PMCA4 in vivo shown to increase arterial contractility. Hence, our objective was to determine the role of PMCA4 in the regulation of BP and to further understand how PMCA4 functionally regulates BP using a novel specific inhibitor to PMCA4, aurintricarboxylic acid (ATA). Our approach assessed conscious BP and contractility of resistance arteries from PMCA4 global knockout (PMCA4KO) mice compared to wild‐type animals. Global ablation of PMCA4 had no significant effect on BP, arterial structure or isolated arterial contractility. ATA treatment significantly reduced BP and arterial contractility in wild‐type mice but had no significant effect in PMCA4KO mice. The effect of ATAin vivo and ex vivo was abolished by the neuronal nitric oxide synthase (nNOS) inhibitor Vinyl‐l‐NIO. Thus, this highlights differences in the effects of PMCA4 ablation and acute inhibition on the vasculature. Importantly, for doses here used, we show the vascular effects of ATA to be specific for PMCA4 and that ATA may be a further experimental tool for elucidating the role of PMCA4.
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Affiliation(s)
- Sophronia Lewis
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Robert Little
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Florence Baudoin
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Sukhpal Prehar
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Ludwig Neyses
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Elizabeth J Cartwright
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - Clare Austin
- Faculty of Biology, Medicine and Health, Division of Cardiovascular Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
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13
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Little R, Cartwright EJ, Neyses L, Austin C. Plasma membrane calcium ATPases (PMCAs) as potential targets for the treatment of essential hypertension. Pharmacol Ther 2016; 159:23-34. [PMID: 26820758 DOI: 10.1016/j.pharmthera.2016.01.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The incidence of hypertension, the major modifiable risk factor for cardiovascular disease, is increasing. Thus, there is a pressing need for the development of new and more effective strategies to prevent and treat hypertension. Development of these relies on a continued evolution of our understanding of the mechanisms which control blood pressure (BP). Resistance arteries are important in the regulation of total peripheral resistance and BP; changes in their structure and function are strongly associated with hypertension. Anti-hypertensives which both reduce BP and reverse changes in resistance arterial structure reduce cardiovascular risk more than therapies which reduce BP alone. Hence, identification of novel potential vascular targets which modify BP is important. Hypertension is a multifactorial disorder which may include a genetic component. Genome wide association studies have identified ATP2B1, encoding the calcium pump plasma membrane calcium ATPase 1 (PMCA1), as having a strong association with BP and hypertension. Knockdown or reduced PMCA1 expression in mice has confirmed a physiological role for PMCA1 in BP and resistance arterial regulation. Altered expression or inhibition of PMCA4 has also been shown to modulate these parameters. The mechanisms whereby PMCA1 and 4 can modulate vascular function remain to be fully elucidated but may involve regulation of intracellular calcium homeostasis and/or comprise a structural role. However, clear physiological links between PMCA and BP, coupled with experimental studies directly linking PMCA1 and 4 to changes in BP and arterial function, suggest that they may be important targets for the development of new pharmacological modulators of BP.
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Affiliation(s)
- Robert Little
- The Institute of Cardiovascular Sciences, The University of Manchester, UK
| | | | - Ludwig Neyses
- The Institute of Cardiovascular Sciences, The University of Manchester, UK
| | - Clare Austin
- Faculty of Health and Social Care, Edge Hill University, UK.
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14
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Abstract
Vascular calcification (VC) is seen ubiquitously in aging blood vessels and prematurely in disease states like renal failure. It is thought to be driven by a number of systemic and local factors that lead to extra-osseous deposition of mineral in the vascular wall and valves as a common endpoint. The response of resident vascular smooth muscle cell to these dystrophic signals appears to be important in this process. Whilst in vivo models allow the observation of global changes in a pro-calcific environment, identifying the specific cells and mechanisms involved has been largely garnered from in vitro experiments, which provide added benefits in terms of reproducibility, cost, and convenience. Here we describe a 7-21 day cell culture model of calcification developed using immortalized murine vascular smooth muscle cells (MOVAS-1). This model provides a method by which vascular smooth muscle cell involvement and manipulation within a mineralizing domain can be studied.
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Affiliation(s)
- Kristen J Kelynack
- Department of Nephrology, Royal Melbourne Hospital, 300 Grattan Street, Parkville, Melbourne, VIC, 3050, Australia
| | - Stephen G Holt
- Department of Nephrology, Royal Melbourne Hospital, 300 Grattan Street, Parkville, Melbourne, VIC, 3050, Australia.
- Department of Medicine, University of Melbourne, Melbourne, VIC, 3050, Australia.
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15
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Momen A, Afroze T, Sadi AM, Khoshbin A, Zhang H, Choi J, Gu S, Zaidi SH, Heximer SP, Husain M. Enhanced proliferation and altered calcium handling in RGS2-deficient vascular smooth muscle cells. J Recept Signal Transduct Res 2014; 34:476-83. [PMID: 24846582 DOI: 10.3109/10799893.2014.920393] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
CONTEXT Regulator of G-protein signaling-2 (RGS2) inhibits Gq-mediated regulation of Ca(2+) signalling in vascular smooth muscle cells (VSMC). OBJECTIVE RGS2 knockout (RGS2KO) mice are hypertensive and show arteriolar remodeling. VSMC proliferation modulates intracellular Ca(2+) concentration [Ca(2+)]i. RGS2 involvement in VSMC proliferation had not been examined. METHODS Thymidine incorporation and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) conversion assays measured cell proliferation. Fura-2 ratiometric imaging quantified [Ca(2+)]i before and after UTP and thapsigargin. [(3)H]-labeled inositol was used for phosphoinositide hydrolysis. Quantitative RT-PCR and confocal immunofluorescence of select Ca(2+) transporters was performed in primary aortic VSMC. RESULTS AND DISCUSSION Platelet-derived growth factor (PDGF) increased S-phase entry and proliferation in VSMC from RGS2KO mice to a greater extent than in VSMC from wild-type (WT) controls. Consistent with differential PDGF-induced changes in Ca(2+) homeostasis, RGS2KO VSMC showed lower resting [Ca(2+)]i but higher thapsigargin-induced [Ca(2+)]i as compared with WT. RGS2KO VSMC expressed lower mRNA levels of plasma membrane Ca(2+) ATPase-4 (PMCA4) and Na(+) Ca(2+) Exchanger (NCX), but higher levels of sarco-endoplasmic reticulum Ca(2+) ATPase-2 (SERCA2). Western blot and immunofluorescence revealed similar differences in PMCA4 and SERCA2 protein, while levels of NCX protein were not reduced in RGS2KO VSMC. Consistent with decreased Ca(2+) efflux activity, (45)Ca-extrusion rates were lower in RGS2KO VSMC. These differences were reversed by the PMCA inhibitor La(3+), but not by replacing extracellular Na(+) with choline, implicating differences in the activity of PMCA and not NCX. CONCLUSION RGS2-deficient VSMC exhibit higher rates of proliferation and coordinate plasticity of Ca(2+)-handling mechanisms in response to PDGF stimulation.
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Affiliation(s)
- Abdul Momen
- Division of Experimental Therapeutics, Toronto General Research Institute , University Health Network, Toronto, Ontario , Canada and
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16
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Afroze T, Yang G, Khoshbin A, Tanwir M, Tabish T, Momen A, Husain M. Calcium efflux activity of plasma membrane Ca2+ ATPase-4 (PMCA4) mediates cell cycle progression in vascular smooth muscle cells. J Biol Chem 2014; 289:7221-7231. [PMID: 24448801 DOI: 10.1074/jbc.m113.533638] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We explored the role played by plasma membrane calcium ATPase-4 (PMCA4) and its alternative splice variants in the cell cycle of vascular smooth muscle cells (VSMC). A novel variant (PMCA4e) was discovered. Quantitative real-time-PCR-quantified PMCA4 splice variant proportions differed in specific organs. The PMCA4a:4b ratio in uninjured carotid arteries (∼1:1) was significantly reduced by wire denudation injury (to ∼1:3) by modulation of alternative splicing, as confirmed by novel antibodies against PMCA4a/e and PMCA4b. Laser capture microdissection localized this shift to the media and adventitia. Primary carotid VSMC from PMCA4 knock-out (P4KO) mice showed impaired [(3)H]thymidine incorporation and G1 phase arrest as compared with wild type (P4WT). Electroporation of expression constructs encoding PMCA4a, PMCA4b, and a PMCA4b mutant lacking PDZ binding rescued this phenotype of P4KO cells, whereas a mutant with only 10% of normal Ca(2+) efflux activity could not. Microarray of early G1-synchronized VSMC showed 39-fold higher Rgs16 (NFAT (nuclear factor of activated T-cells) target; MAPK inhibitor) and 69-fold higher Decorin (G1 arrest marker) expression in P4KO versus P4WT. Validation by Western blot also revealed decreased levels of Cyclin D1 and NFATc3 in P4KO. Microarrays of P4KO VSMC rescued by PMCA4a or PMCA4b expression showed reversal of perturbed Rgs16, Decorin, and NFATc3 expression levels. However, PMCA4a rescue caused a 44-fold reduction in AP-2β, a known anti-proliferative transcription factor, whereas PMCA4b rescue resulted in a 50-fold reduction in p15 (Cyclin D1/Cdk4 inhibitor). We conclude that Ca(2+) efflux activity of PMCA4 underlies G1 progression in VSMC and that PMCA4a and PMCA4b differentially regulate specific downstream mediators.
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Affiliation(s)
- Talat Afroze
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Ge Yang
- Institute of Medical Sciences, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Amir Khoshbin
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Mansoor Tanwir
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Taha Tabish
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Abdul Momen
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Mansoor Husain
- Division of Experimental Therapeutics, Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada; Institute of Medical Sciences, University of Toronto, Toronto, Ontario M5S 1A8, Canada; Heart and Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, Toronto, Ontario M5G 1L7; Department of Medicine, University of Toronto, Toronto, Ontario M5G 2C4, Canada.
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17
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Berchtold MW, Villalobo A. The many faces of calmodulin in cell proliferation, programmed cell death, autophagy, and cancer. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1843:398-435. [PMID: 24188867 DOI: 10.1016/j.bbamcr.2013.10.021] [Citation(s) in RCA: 230] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 10/24/2013] [Accepted: 10/26/2013] [Indexed: 12/21/2022]
Abstract
Calmodulin (CaM) is a ubiquitous Ca(2+) receptor protein mediating a large number of signaling processes in all eukaryotic cells. CaM plays a central role in regulating a myriad of cellular functions via interaction with multiple target proteins. This review focuses on the action of CaM and CaM-dependent signaling systems in the control of vertebrate cell proliferation, programmed cell death and autophagy. The significance of CaM and interconnected CaM-regulated systems for the physiology of cancer cells including tumor stem cells, and processes required for tumor progression such as growth, tumor-associated angiogenesis and metastasis are highlighted. Furthermore, the potential targeting of CaM-dependent signaling processes for therapeutic use is discussed.
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Key Words
- (4-[3,5-bis-[2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-4,5-dihydro-pyrazol-1-yl]-benzoic acid
- (4-[3,5-bis-[2-(4-hydroxy-3-methoxy-phenyl)-vinyl]-4,5-dihydro-pyrazol-1-yl]-phenyl)-(4-methyl-piperazin-1-yl)-methanone
- (−) enantiomer of dihydropyrine 3-methyl-5-3-(4,4-diphenyl-1-piperidinyl)-propyl-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-piridine-3,5-dicarboxylate-hydrochloride (niguldipine)
- 1-[N,O-bis(5-isoquinolinesulfonyl)-N-methyl-l-tyrosyl]-4-phenylpiperazine
- 12-O-tetradecanoyl-phorbol-13-acetate
- 2-chloro-(ε-amino-Lys(75))-[6-(4-(N,N′-diethylaminophenyl)-1,3,5-triazin-4-yl]-CaM adduct
- 3′-(β-chloroethyl)-2′,4′-dioxo-3,5′-spiro-oxazolidino-4-deacetoxy-vinblastine
- 7,12-dimethylbenz[a]anthracene
- Apoptosis
- Autophagy
- B859-35
- CAPP(1)-CaM
- Ca(2+) binding protein
- Calmodulin
- Cancer biology
- Cell proliferation
- DMBA
- EBB
- FL-CaM
- FPCE
- HBC
- HBCP
- J-8
- KAR-2
- KN-62
- KN-93
- N-(4-aminobutyl)-2-naphthalenesulfonamide
- N-(4-aminobutyl)-5-chloro-2-naphthalenesulfonamide
- N-(6-aminohexyl)-1-naphthalenesulfonamide
- N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide
- N-8-aminooctyl-5-iodo-naphthalenesulfonamide
- N-[2-[N-(4-chlorocinnamyl)-N-methylaminomethyl]phenyl]-N-(2-hydroxyethyl)-4-methoxybenzenesulfonamide
- O-(4-ethoxyl-butyl)-berbamine
- RITC-CaM
- TA-CaM
- TFP
- TPA
- W-12
- W-13
- W-5
- W-7
- fluorescein-CaM adduct
- fluphenazine-N-2-chloroethane
- norchlorpromazine-CaM adduct
- rhodamine isothiocyanate-CaM adduct
- trifluoperazine
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Affiliation(s)
- Martin W Berchtold
- Department of Biology, University of Copenhagen, Copenhagen Biocenter 4-2-09 Ole Maaløes Vej 5, DK-2200 Copenhagen N, Denmark.
| | - Antonio Villalobo
- Instituto de Investigaciones Biomédicas, Department of Cancer Biology, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, c/Arturo Duperier 4, E-28029 Madrid, Spain.
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18
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Rivera J, Walduck AK, Thomas SR, Glaros EN, Hooker EU, Guida E, Sobey CG, Drummond GR. Accumulation of serum lipids by vascular smooth muscle cells involves a macropinocytosis-like uptake pathway and is associated with the downregulation of the ATP-binding cassette transporter A1. Naunyn Schmiedebergs Arch Pharmacol 2013; 386:1081-93. [PMID: 23989929 DOI: 10.1007/s00210-013-0909-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 08/12/2013] [Indexed: 01/01/2023]
Abstract
Vascular smooth muscle cells (VSMC) are present in arterial intima before atherosclerotic plaques develop and are likely to be exposed to unmodified serum lipids as they enter the vessel wall. We examined the effects of sera from mice on the morphology and function of mouse VSMC. Incubation of a mouse VSMC line (MOVAS) with sera from normocholesterolemic (C57BL/6J) or hypercholesterolemic (APOE(-/-)) mice caused concentration-dependent increases in lipid accumulation as measured by AdipoRed, with the extent of lipid uptake significantly greater with the latter sera type. Inhibition of c-Jun N-terminal kinases (SP600125), Src kinases (AG1879), and clathrin-dependent endocytosis (monodansylcadaverine) to disrupt scavenger receptor-mediated uptake of lipids had no effect on serum-induced lipid accumulation by VSMC. By contrast, inhibition of macropinocytosis with antagonists of PI-3 kinase (LY294002) and actin (cytochalasin D) markedly reduced lipid accumulation. Serum exposure reduced the expression of the ATP-binding cassette transporter A1, consistent with impaired cholesterol efflux, but had no effect on the expression of markers of VSMC differentiation. Moreover, the expression of several inflammation and foam cell markers was unchanged (CCL2, CCL5, and CD68) by mouse sera. The accumulation of unmodified serum lipids by VSMC involves a macropinocytosis-like uptake pathway and is associated with the downregulation of the ATP-binding cassette transporter. We speculate that VSMC may play an atheroprotective role in arterial intima by acting as a "sink" for unmodified lipids.
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Affiliation(s)
- Jennifer Rivera
- Vascular Biology and Immunopharmacology Group, Department of Pharmacology, Monash University, Building 13E, Wellington Road, Clayton, VIC, 3800, Australia
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19
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Rivera J, Walduck AK, Strugnell RA, Sobey CG, Drummond GR. Chlamydia pneumoniae induces a pro-inflammatory phenotype in murine vascular smooth muscle cells independently of elevating reactive oxygen species. Clin Exp Pharmacol Physiol 2012; 39:218-26. [PMID: 22211630 DOI: 10.1111/j.1440-1681.2011.05657.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: 11/27/2022]
Abstract
NADPH oxidases (Nox) are reactive oxygen species (ROS)-generating enzymes that play important physiological roles in host defence and redox signalling. However, Nox activity is upregulated in the vascular wall during atherosclerosis and contributes to plaque formation by promoting oxidative stress and inflammation. The bacterium Chlamydia pneumoniae has been detected in vascular smooth muscle cells (VSMC) of human atheroma. We hypothesized that C. pneumoniae infection of VSMC causes Nox activation, which initially limits infection but ultimately causes oxidative stress, activation of pro-inflammatory pathways and an atherogenic phenotype. Chlamydia pneumoniae infection of mouse cultured VSMC significantly increased ROS production by twofold but did not upregulate mRNA expression of Nox1 or Nox4. Chlamydia pneumoniae did increase Nox2 mRNA levels significantly by threefold, but this did not translate to elevated Nox2 protein expression. The Nox inhibitor gp91ds-tat had no effect on C. pneumoniae-induced ROS production. In contrast, apocynin significantly reduced ROS levels by 75% in C. pneumoniae-infected VSMC, an effect most likely attributable to its direct anti-oxidant action. Although apocynin had no effect on C. pneumoniae-induced expression of inflammatory markers, bacteria recovered from apocynin-treated VSMC displayed a higher degree of infectivity in HEp-2 cells. In conclusion, C. pneumoniae infection increases ROS production in VSMC independently of Nox activity. Although elevated ROS production appears to serve a protective role by limiting the spread of infection, we speculate that this response will be detrimental over the long term by causing oxidative stress and a smouldering inflammatory response by maintaining C. pneumoniae persistence within the cell.
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Affiliation(s)
- Jennifer Rivera
- Department of Pharmacology, Vascular Biology & Immunopharmacology Group, Monash University, Clayton, Australia
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20
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Beretta M, Wölkart G, Schernthaner M, Griesberger M, Neubauer R, Schmidt K, Sacherer M, Heinzel FR, Kohlwein SD, Mayer B. Vascular bioactivation of nitroglycerin is catalyzed by cytosolic aldehyde dehydrogenase-2. Circ Res 2011; 110:385-93. [PMID: 22207712 DOI: 10.1161/circresaha.111.245837] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
RATIONALE According to general view, aldehyde dehydrogenase-2 (ALDH2) catalyzes the high-affinity pathway of vascular nitroglycerin (GTN) bioactivation in smooth muscle mitochondria. Despite having wide implications to GTN pharmacology and raising many questions that are still unresolved, mitochondrial bioactivation of GTN in blood vessels is still lacking experimental support. OBJECTIVE In the present study, we investigated whether bioactivation of GTN is affected by the subcellular localization of ALDH2 using immortalized ALDH2-deficient aortic smooth muscle cells and mouse aortas with selective overexpression of the enzyme in either cytosol or mitochondria. METHODS AND RESULTS Quantitative Western blotting revealed that ALDH2 is mainly cytosolic in mouse aorta and human coronary arteries, with only approximately 15% (mouse) and approximately 5% (human) of the enzyme being localized in mitochondria. Infection of ALDH2-deficient aortic smooth muscle cells or isolated aortas with adenovirus containing ALDH2 cDNA with or without the mitochondrial signal peptide sequence led to selective expression of the protein in mitochondria and cytosol, respectively. Cytosolic overexpression of ALDH2 restored GTN-induced relaxation and GTN denitration to wild-type levels, whereas overexpression in mitochondria (6-fold vs wild-type) had no effect on relaxation. Overexpression of ALDH2 in the cytosol of ALDH2-deficient aortic smooth muscle cells led to a significant increase in GTN denitration and cyclic GMP accumulation, whereas mitochondrial overexpression had no effect. CONCLUSIONS The data indicate that vascular bioactivation of GTN is catalyzed by cytosolic ALDH2. Mitochondrial GTN metabolism may contribute to oxidative stress-related adverse effects of nitrate therapy and the development of nitrate tolerance.
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Affiliation(s)
- Matteo Beretta
- Department of Pharmacology and Toxicology, Karl-Franzens Universität Graz, Austria
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Ishida M, El-Mounayri O, Kattman S, Zandstra P, Sakamoto H, Ogawa M, Keller G, Husain M. Regulated expression and role of c-Myb in the cardiovascular-directed differentiation of mouse embryonic stem cells. Circ Res 2011; 110:253-64. [PMID: 22116818 DOI: 10.1161/circresaha.111.259499] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
RATIONALE c-myb null (knockout) embryonic stem cells (ESC) can differentiate into cardiomyocytes but not contractile smooth muscle cells (SMC) in embryoid bodies (EB). OBJECTIVE To define the role of c-Myb in SMC differentiation from ESC. METHODS AND RESULTS In wild-type (WT) EB, high c-Myb levels on days 0-2 of differentiation undergo ubiquitin-mediated proteosomal degradation on days 2.5-3, resurging on days 4-6, without changing c-myb mRNA levels. Activin-A and bone morphogenetic protein 4-induced cardiovascular progenitors were isolated by FACS for expression of vascular endothelial growth factor receptor (VEGFR)2 and platelet-derived growth factor receptor (PDGFR)α. By day 3.75, hematopoesis-capable VEGFR2+ cells were fewer, whereas cardiomyocyte-directed VEGFR2+/PDGFRα+ cells did not differ in abundance in knockout versus WT EB. Importantly, highest and lowest levels of c-Myb were observed in VEGFR2+ and VEGFR2+/PDGFRα+ cells, respectively. Proteosome inhibitor MG132 and lentiviruses enabling inducible expression or knockdown of c-myb were used to regulate c-Myb in WT and knockout EB. These experiments showed that c-Myb promotes expression of VEGFR2 over PDGFRα, with chromatin immunopreciptation and promoter-reporter assays defining specific c-Myb-responsive binding sites in the VEGFR2 promoter. Next, FACS-sorted VEGFR2+ cells expressed highest and lowest levels of SMC- and fibroblast-specific markers, respectively, at days 7-14 after retinoic acid (RA) as compared with VEGFR2+/PDGFRα+ cells. By contrast, VEGFR2+/PDGFRα+ cells cultured without RA beat spontaneously, like cardiomyocytes between days 7 and 14, and expressed cardiac troponin. Notably, RA was required to more fully differentiate SMC from VEGFR2+ cells and completely blocked differentiation of cardiomyocytes from VEGFR2+/PDGFRα+ cells. CONCLUSIONS c-Myb is tightly regulated by proteosomal degradation during cardiovascular-directed differentiation of ESC, expanding early-stage VEGFR2+ progenitors capable of RA-responsive SMC formation.
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Affiliation(s)
- Masayoshi Ishida
- Heart and Stroke Richard Lewar Centre of Excellence, University of Toronto, Toronto, ON, Canada, M5G 1L7
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22
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Cui J, Zhang G, Hao C, Wang Y, Lou Y, Zhang W, Wang J, Liu S. The expression of TIPE1 in murine tissues and human cell lines. Mol Immunol 2011; 48:1548-55. [DOI: 10.1016/j.molimm.2011.04.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 04/27/2011] [Accepted: 04/27/2011] [Indexed: 10/18/2022]
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Sabatini PJB, Zhang M, Silverman-Gavrila RV, Bendeck MP. Cadherins at cell-autonomous membrane contacts control macropinocytosis. J Cell Sci 2011; 124:2013-20. [PMID: 21610088 DOI: 10.1242/jcs.076901] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cadherins aggregate and stabilize cell-cell junctions through interactions with adjacent cells. In addition, N-cadherin and E-cadherin concentrate at free edges or at the lamellipodia of migrating cells and are found within large vesicles called macropinosomes, which develop from membrane ruffles. The binding properties of cadherins have not previously been associated with the localization of cadherins at membrane ruffles; however, we report that the dorsal, ventral and lateral membrane contacts that occur as a result of the overlap of membrane ruffles aggregate N-cadherin, and that both N-cadherin and E-cadherin promote macropinosome closure and fluid-phase uptake in macropinosomes. These data reveal a previously unsuspected function for cadherin-mediated cell-cell adhesion molecules in the closure of cell-autonomous membrane contacts at membrane ruffles, resulting in macropinocytosis.
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Affiliation(s)
- Peter J B Sabatini
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON M5S1A8, Canada
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24
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Hui S, Choi J, Zaidi S, Momen A, Steinbach SK, Sadi AM, Ban K, Husain M. Peptide-Mediated Disruption of Calmodulin–Cyclin E Interactions Inhibits Proliferation of Vascular Smooth Muscle Cells and Neointima Formation. Circ Res 2011; 108:1053-62. [DOI: 10.1161/circresaha.110.239483] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Sonya Hui
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Jaehyun Choi
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Syed Zaidi
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Abdul Momen
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Sarah K. Steinbach
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Al-Muktafi Sadi
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Kiwon Ban
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
| | - Mansoor Husain
- From the Division of Cell and Molecular Biology (S.H., J.C., S.Z., A.M., S.K.S., A.-M.S., K.B., M.H.), Toronto General Hospital Research Institute; and Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research (M.H.), Institute of Medical Science (J.C., M.H.), and Departments of Medicine (S.Z., M.H.) and Physiology (S.H., K.B., M.H.), University of Toronto, Canada
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Rosiglitazone induces the unfolded protein response, but has no significant effect on cell viability, in monocytic and vascular smooth muscle cells. Biochem Biophys Res Commun 2010; 400:689-95. [PMID: 20816668 DOI: 10.1016/j.bbrc.2010.08.129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 08/27/2010] [Indexed: 11/24/2022]
Abstract
Given the safety concerns expressed over negative cardiovascular outcomes resulting from the clinical use of rosiglitazone, and the view that rosiglitazone exerts PPARγ-independent effects alongside its insulin-sensitising PPARγ-dependent effects, we hypothesised that rosiglitazone may trigger Unfolded Protein Responses (UPRs) due to disruptions in [Ca(2+)](i) homeostasis within two cardiovascular cell types: monocytic (MM6) and vascular smooth muscle (A7r5) cells. In microsomal samples derived from both cell types, pre-incubation with rosiglitazone rapidly (30min) brought about concentration-dependent PPARγ-independent inhibition of Ca(2+)ATPase activity (IC(50) ∼2μM). Fluo-3 fluorimetric data demonstrated in intact cells that 1h treatment with 1 or 10μM rosiglitazone caused Ca(2+) ions to leak into the cytoplasm. Gene expression analysis showed that within 4h of rosiglitazone exposure, the UPR transcription factor XBP-1 was activated (likely due to corresponding ER Ca(2+) depletion), and the UPR target genes BiP and SERCA2b were subsequently upregulated within 24-72h. After 72h 1 or 10μM rosiglitazone treatment, microsomal Ca(2+)ATPase activity increased to >2-fold of that seen in control microsomes, while [Ca(2+)](i) returned to basal, indicating that UPR-triggered SERCA2b upregulation was responsible for enhanced enzymatic Ca(2+) sequestration within the ER. This appeared to be sufficient to replenish ER Ca(2+) stores and restore normal cell physiology, as cell viability levels were not decreased due to rosiglitazone treatment throughout a 2-week study. Thus, incubation with 1-10μM rosiglitazone triggers the UPR, but does not prove cytotoxic, in cells of the cardiovascular system. This observation provides an important contribution to the current debate over the use of rosiglitazone in the clinical treatment of Type-2 Diabetes.
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Recapitulation of two genomewide association studies on blood pressure and essential hypertension in the Korean population. J Hum Genet 2010; 55:336-41. [DOI: 10.1038/jhg.2010.31] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Genetic variations in ATP2B1, CSK, ARSG and CSMD1 loci are related to blood pressure and/or hypertension in two Korean cohorts. J Hum Hypertens 2009; 24:367-72. [PMID: 19960030 DOI: 10.1038/jhh.2009.86] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Blood pressure, one of the important vital signs, is affected by multiple genetic and environmental factors. Recently, several genome-wide association (GWA) studies have successfully identified genetic factors that influence blood pressure and hypertension risk. In this study, we report results of the Korean Association REsource (KARE, 8842 subjects) GWA study on blood pressure and hypertension risk. In all, 10 single-nucleotide polymorphisms (SNPs) that showed significant association with hypertension were further analysed for replication associations in the Health2 project (7861 subjects). Among these 10 SNPs, 3 were replicated in the Health2 cohort for an association with systolic or diastolic blood pressure. The most significant SNP (rs17249754 located in ATPase, Ca(++) transporting, plasma membrane 1 (ATP2B1)) has been previously reported, and the other two SNPs are rs1378942 in the c-src tyrosine kinase (CSK) gene and rs12945290 in the arylsulphatase G (ARSG) gene. An additional hypertension case-control study confirmed that rs17249754 (in ATP2B1) increases hypertension risk in both the KARE and Health2 (meta-analysis, P-value=4.25 x 10(-9)) cohorts. One more SNP, rs995322, located in the CUB and Sushi multiple domains 1 (CSMD1), is also associated with increased risk of hypertension (meta-analysis, P-value=1.00 x 10(-4)). Despite the difficulty of obtaining replication results for a complex trait genetic association between blood pressure and hypertension, we were able to identify consistent genetic factors in both the Korean cohorts in ATP2B1, CSK, ARSG and CSMD1 genes.
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Lau AC, Duong TT, Ito S, Yeung RSM. Intravenous immunoglobulin and salicylate differentially modulate pathogenic processes leading to vascular damage in a model of Kawasaki disease. ACTA ACUST UNITED AC 2009; 60:2131-41. [PMID: 19565485 DOI: 10.1002/art.24660] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
OBJECTIVE Kawasaki disease (KD) is a multisystem vasculitis affecting children and is characterized by immune activation in the acute stage of disease. Systemic inflammation eventually subsides, although coronary arteritis persists, resulting in aneurysm formation. KD is the leading cause of acquired heart disease among children in North America. Accepted treatment guidelines include high-dose intravenous immunoglobulin (IVIG) and aspirin in the acute phase. Although this therapy is effective, the cellular and molecular mechanisms involved are not clear. The aim of this study was to examine the effect of IVIG and salicylate at each stage of disease development. METHODS Using a murine model of KD, we established and validated several in vitro techniques to reflect 3 key steps involved in disease pathogenesis, as follows: thymidine incorporation to evaluate T cell activation, enzyme-linked immunosorbent assay to measure tumor necrosis factor alpha (TNFalpha) production, and real-time polymerase chain reaction to examine TNFalpha-mediated expression of matrix metalloproteinase 9 (MMP-9). RESULTS At therapeutic concentrations, IVIG, but not salicylate, effectively reduced the immune response leading to TNFalpha expression. Unexpectedly, pharmacologic doses of salicylate were not able to inhibit TNFalpha production and in fact enhanced its production. Neither drug directly regulated MMP-9 expression but did so only indirectly via modulating TNFalpha. TNFalpha activity was a prerequisite for local expression of MMP-9 at the coronary artery. CONCLUSION Therapeutic concentrations of IVIG and salicylate differentially modulate the expression of TNFalpha and its downstream effects. Further dissection of the biologic effects of aspirin in acute KD is necessary for the rational design of therapy.
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Affiliation(s)
- Andrew C Lau
- Hospital for Sick Children Research Institute, Toronto, Ontario, Canada
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Lau AC, Duong TT, Ito S, Wilson GJ, Yeung RSM. Inhibition of matrix metalloproteinase-9 activity improves coronary outcome in an animal model of Kawasaki disease. Clin Exp Immunol 2009; 157:300-9. [PMID: 19604270 DOI: 10.1111/j.1365-2249.2009.03949.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Kawasaki disease (KD) is the leading cause of acquired heart disease of children in North America. It is characterized by a massive immune activation and multi-system vasculitis, which evolves into a site-specific inflammatory response focused at the coronary arteries. Coronary artery (CA) inflammation leads to elastin breakdown, destruction of the vessel wall and aneurysm formation. We have demonstrated recently the pivotal role of tumour necrosis factor (TNF)-alpha-mediated matrix metalloproteinase (MMP)-9 activity in the pathogenesis of elastin breakdown in a murine model of KD, Lactobacillus casei cell wall extract-induced coronary arteritis. Using this model, we evaluated the in vitro effects of doxycycline, an antibiotic with MMP inhibitory function, in modulating key pathogenic stages of disease leading to CA damage. Doxycycline inhibits T cell activation and TNF-alpha production in peripheral immune cells, as assessed by thymidine incorporation and a TNF bioassay respectively. Additionally, doxycycline inhibits directly MMP-9 enzymatic activity derived from TNF-alpha-stimulated vascular smooth muscle cells as assayed by zymography. More importantly, in vivo treatment of Lactobacillus casei cell wall extract (LCWE)-injected mice with doxycycline reduces significantly the incidence of CA elastin breakdown and reduces loss of elastin. Therefore, doxycycline can mitigate TNF-alpha-induced MMP-9-mediated coronary elastin breakdown and improve coronary outcome. Agents with the ability to inhibit both inflammation and the downstream effects of inflammation, such as MMP-9 activity, offer a promising therapeutic strategy for the management of children with KD.
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Affiliation(s)
- A C Lau
- Cell Biology Program, Hospital for Sick Children Research Institute, University of Toronto, Toronto, Canada
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Abstract
Rationale:
We previously identified a novel serine carboxypeptidase, SCPEP1, that undergoes cleavage across all tissues where it is expressed. SCPEP1 bears the signature catalytic triad found in all serine carboxypeptidases, but its biological function is completely unknown.
Objective:
To begin elucidating the functions of SCPEP1 in vitro and in the vessel wall after injury.
Methods and Results:
Cultured smooth muscle cells were transduced with adenovirus carrying wild-type
Scpep1
, a short hairpin RNA to
Scpep1
, or variants of
Scpep1
with mutations that disrupt the catalytic triad domain or SCPEP1 cleavage. Western blotting of key growth regulators or growth and migratory responses were assessed following SCPEP1 gain- or loss-of-function in smooth muscle cells. Vascular injury-induced remodeling and cell proliferation were evaluated in wild-type or newly created
Scpep1
knockout mice. Overexpression of wild-type or cleavage-defective SCPEP1, but not a catalytic triad mutant SCPEP1, promotes smooth muscle cell proliferation and migration in vitro. A short hairpin RNA to
Scpep1
blunts endogenous growth, which is rescued on concurrent expression of
Scpep1
carrying silent mutations that evade knockdown. SCPEP1 protein is highly expressed in the neointima of 2 models of vascular remodeling.
Scpep1
-null mice show decreases in medial and intimal cell proliferation as well as vessel remodeling following arterial injury.
Conclusions:
SCPEP1 promotes smooth muscle cell proliferation and migration in a catalytic triad-dependent, cleavage-independent manner. SCPEP1 represents a new mediator of vascular remodeling and a potential therapeutic target for the treatment of vascular occlusive diseases.
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Chalmers JA, Martino TA, Tata N, Ralph MR, Sole MJ, Belsham DD. Vascular circadian rhythms in a mouse vascular smooth muscle cell line (Movas-1). Am J Physiol Regul Integr Comp Physiol 2008; 295:R1529-38. [DOI: 10.1152/ajpregu.90572.2008] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The circadian system in mammals is a hierarchy of oscillators throughout the organism that are coordinated by the circadian clock in the hypothalamic suprachiasmatic nucleus. Peripheral clocks act to integrate time-of-day information from neural or hormonal signals, regulating gene expression, and, subsequently, organ physiology. However, the mechanisms by which the central clock communicates with peripheral oscillators are not understood and are likely tissue specific. In this study, we establish a mouse vascular cell model suitable for investigations of these mechanisms at a molecular level. Using the immortalized vascular smooth muscle cell line Movas-1, we determined that these cells express the circadian clock machinery with robust rhythms in mRNA expression over a 36-h period after serum shock synchronization. Furthermore, norepinephrine and forskolin were able to synchronize circadian rhythms in bmal1. With synchronization, we observed cycling of specific genes, including the tissue inhibitor of metalloproteinase 1 and 3 ( timp1, timp3), collagen 3a1 ( col3a1), transgelin 1 ( sm22α), and calponin 1 ( cnn1). Diurnal expression of these genes was also found in vivo in mouse aortic tissue, using microarray and real-time RT-PCR analysis. Both of these revealed ultradian rhythms in genes similar to the cycling observed in Movas-1 in vitro. These findings highlight the cyclical nature of structurally important genes in the vasculature that is similar both in vivo and in vitro. This study establishes the Movas-1 cells as a novel cell model from which to further investigate the molecular mechanisms of clock regulation in the vasculature.
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Sabatini PJB, Zhang M, Silverman-Gavrila R, Bendeck MP, Langille BL. Homotypic and endothelial cell adhesions via N-cadherin determine polarity and regulate migration of vascular smooth muscle cells. Circ Res 2008; 103:405-12. [PMID: 18617695 DOI: 10.1161/circresaha.108.175307] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Migration of smooth muscle cells from the arterial media to the intima is central to several vascular pathologies including restenosis. This study demonstrates that, like directional migration of other cells, smooth muscle migration is accompanied by a dramatic, polarized reorganization of the cell cytoskeleton that is accompanied by activation of the Rho GTPase Cdc42 and inactivation of glycogen synthase kinase-3beta. We also show, for the first time, that signals generated at the posterior-lateral aspects of wound edge cells by the cell-cell adhesion molecule N-cadherin are required for polarization and rapid migration of vascular smooth muscle. Importantly, when a cohort of migrating smooth muscle cells encounter CHO cells or the A10 smooth muscle cell line, neither of which expresses N-cadherin, polarity is only slightly suppressed. However, when smooth muscle cells encounter stably transfected, N-cadherin-expressing A10 cells or (N-cadherin-expressing) vascular endothelium, they rapidly lose their polarized phenotype. The latter finding indicates that endothelial signaling to innermost smooth muscle cells via N-cadherin may be critical to normal vessel wall stability. We infer that asymmetrical distribution of N-cadherin is necessary for the establishment of cell polarity during migration and that N-cadherin ligation is highly effective in abrogating polarized migration. Finally, we showed that endothelial cell polarity does not depend on N-cadherin; therefore, this molecule may be an attractive target for therapies to prevent restenosis without suppressing endothelial repair and risking late thrombosis.
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Affiliation(s)
- Peter J B Sabatini
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada M5G 1L7
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Lau AC, Duong TT, Ito S, Yeung RSM. Matrix metalloproteinase 9 activity leads to elastin breakdown in an animal model of Kawasaki disease. ACTA ACUST UNITED AC 2008; 58:854-63. [PMID: 18311803 DOI: 10.1002/art.23225] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Kawasaki disease (KD) is a multisystem vasculitis leading to damage in the coronary circulation and aneurysm formation. Because cardiac tissue from affected children is not available, investigation of the mechanisms responsible for coronary artery damage in KD requires use of a disease model. The present study was undertaken to examine, in an experimental model, the role of matrix metalloproteinase 9 (MMP-9) on coronary artery inflammation and vascular damage. METHODS C57BL/6 mice were injected with Lactobacillus casei cell wall extract to induce coronary arteritis. Hearts were isolated and assayed for MMP-9 protein expression and enzymatic activity by immunoblotting or confocal microscopy and zymography, respectively. MMP-9-deficient mice were used to examine the necessity of MMP-9 for disease development. RESULTS Localized inflammation at the coronary artery led to elastin breakdown and aneurysm formation. This occurred in the absence of smooth muscle cell apoptosis. Following disease induction, there was an increase in the amount and enzymatic activity of MMP-9, an elastolytic protease. MMP-9 was up-regulated by tumor necrosis factor alpha (TNFalpha) and produced primarily by vascular smooth muscle cells. In MMP-9-deficient animals, vascular inflammation continued to develop, but the incidence of elastin breakdown was significantly reduced. Elastin breakdown in the coronary artery was virtually eliminated by ablation of MMP-9. CONCLUSION These findings show that TNFalpha up-regulates expression of MMP-9, an important proteinase responsible for extracellular matrix breakdown, leading to coronary artery damage in this model of KD. These results have important implications regarding treatments for improving coronary outcome in affected children.
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Affiliation(s)
- Andrew C Lau
- Hospital for Sick Children, and University of Toronto, Toronto, Ontario, Canada
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Ban K, Noyan-Ashraf MH, Hoefer J, Bolz SS, Drucker DJ, Husain M. Cardioprotective and vasodilatory actions of glucagon-like peptide 1 receptor are mediated through both glucagon-like peptide 1 receptor-dependent and -independent pathways. Circulation 2008; 117:2340-50. [PMID: 18427132 DOI: 10.1161/circulationaha.107.739938] [Citation(s) in RCA: 783] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND The glucagon-like peptide 1 receptor (GLP-1R) is believed to mediate glucoregulatory and cardiovascular effects of the incretin hormone GLP-1(7-36) (GLP-1), which is rapidly degraded by dipeptidyl peptidase-4 (DPP-4) to GLP-1(9-36), a truncated metabolite generally thought to be inactive. Novel drugs for the treatment of diabetes include analogues of GLP-1 and inhibitors of DPP-4; however, the cardiovascular effects of distinct GLP-1 peptides have received limited attention. METHODS AND RESULTS Here, we show that endothelium and cardiac and vascular myocytes express a functional GLP-1R as GLP-1 administration increased glucose uptake, cAMP and cGMP release, left ventricular developed pressure, and coronary flow in isolated mouse hearts. GLP-1 also increased functional recovery and cardiomyocyte viability after ischemia-reperfusion injury of isolated hearts and dilated preconstricted arteries from wild-type mice. Unexpectedly, many of these actions of GLP-1 were preserved in Glp1r(-/-) mice. Furthermore, GLP-1(9-36) administration during reperfusion reduced ischemic damage after ischemia-reperfusion and increased cGMP release, vasodilatation, and coronary flow in wild-type and Glp1r(-/-) mice, with modest effects on glucose uptake. Studies using a DPP-4-resistant GLP-1R agonist and inhibitors of DPP-4 and nitric oxide synthase showed that the effects of GLP-1(7-36) were partly mediated by GLP-1(9-36) through a nitric oxide synthase-requiring mechanism that is independent of the known GLP-1R. CONCLUSIONS These data describe cardioprotective actions of GLP-1(7-36) mediated through the known GLP-1R and novel cardiac and vascular actions of GLP-1(7-36) and its metabolite GLP-1(9-36) independent of the known GLP-1R. Our data suggest that the extent to which GLP-1 is metabolized to GLP-1(9-36) may have functional implications in the cardiovascular system.
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Affiliation(s)
- Kiwon Ban
- Heart and Stroke Richard Lewar Centre of Excellence for Cardiovascular Research, University of Toronto, Ontario, Canada M5G-1C4
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Kolodziejska KM, Noyan-Ashraf M, Nagy A, Bacon A, Frampton J, Xin HB, Kotlikoff MI, Husain M. c-Myb–Dependent Smooth Muscle Cell Differentiation. Circ Res 2008; 102:554-61. [DOI: 10.1161/circresaha.105.162628] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Karolina M. Kolodziejska
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - M.H. Noyan-Ashraf
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Andras Nagy
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Andrea Bacon
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Jon Frampton
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Hong-Bo Xin
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Michael I. Kotlikoff
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
| | - Mansoor Husain
- From the Heart & Stroke Richard Lewar Center of Excellence in Cardiovascular Research (K.M.K., M.H.N.-A., M.H.), Department of Medicine, University of Toronto, and the McEwen Centre for Regenerative Medicine, Toronto General Hospital Research Institute, Canada; Samuel Lunenfeld Research Institute (A.N.), Department of Molecular and Medical Genetics, University of Toronto, and Mount Sinai Hospital, Toronto, Canada; Division of Immunity and Infection (A.B., J.F.), Birmingham University Medical
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36
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Ferraiuolo L, Heath PR, Holden H, Kasher P, Kirby J, Shaw PJ. Microarray analysis of the cellular pathways involved in the adaptation to and progression of motor neuron injury in the SOD1 G93A mouse model of familial ALS. J Neurosci 2007; 27:9201-19. [PMID: 17715356 PMCID: PMC6672214 DOI: 10.1523/jneurosci.1470-07.2007] [Citation(s) in RCA: 160] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The cellular pathways of motor neuronal injury have been investigated in the SOD1 G93A murine model of familial amyotrophic lateral sclerosis (ALS) using laser-capture microdissection and microarray analysis. The advantages of this study include the following: analysis of changes specifically in motor neurons (MNs), while still detecting effects of interactions with neighboring cells; the ability to profile changes during disease progression, an approach not possible in human ALS; and the use of transgenic mice bred on a homogeneous genetic background, eliminating the confounding effects arising from a mixed genetic background. By using this rigorous approach, novel changes in key cellular pathways have been detected at both the presymptomatic and late stages, which have been validated by quantitative reverse transcription-PCR. At the presymptomatic stage (60 d), MNs extracted from SOD1 G93A mice show a significant increase in expression of genes subserving both transcriptional and translational functions, as well as lipid and carbohydrate metabolism, mitochondrial preprotein translocation, and respiratory chain function, suggesting activation of a strong cellular adaptive response. Mice 90 d old still show upregulation of genes involved in carbohydrate metabolism, whereas transcription and mRNA processing genes begin to show downregulation. Late in the disease course (120 d), important findings include the following: marked transcriptional repression, with downregulation of multiple transcripts involved in transcriptional and metabolic functions; upregulation of complement system components; and increased expression of key cyclins involved in cell-cycle regulation. The changes described in the motor neuron transcriptome evolving during the disease course highlight potential novel targets for neuroprotective therapeutic intervention.
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Affiliation(s)
- Laura Ferraiuolo
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
| | - Paul R. Heath
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
| | - Hazel Holden
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
| | - Paul Kasher
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
| | - Janine Kirby
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
| | - Pamela J. Shaw
- Academic Neurology Unit, Section of Neuroscience, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom
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37
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Yu YG, Tang FG, Pan J, Gu XF. Effects of Phenylalanine and its Metabolites on Cytoplasmic Free Calcium in Cortical Neurons. Neurochem Res 2007; 32:1292-301. [PMID: 17401656 DOI: 10.1007/s11064-007-9303-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2006] [Accepted: 01/30/2007] [Indexed: 01/16/2023]
Abstract
Classic phenylketonuria (PKU) is characterized by brain lesions. However, its underlying neurotoxic mechanisms remain unknown. Based on our previous studies, we hypothesized that calcium might participate in PKU-associated neuropathy. In cultured cortical neurons, cytoplasmic free calcium concentration ([Ca(2+)](i)) decreased dramatically when treatment with phenylalanine (Phe) and phenyllactic acid, while phenylacetic acid treatment immediately increased [Ca(2+)](i), which began to decrease after 3 min. Moreover, [Ca(2+)](i) decreased dramatically after Phe treatment in the presence of EGTA suggesting that Phe might increase [Ca(2+)](i) efflux. Phe-induced [Ca(2+)](i) decrease was strongly inhibited by vanadate, a non-specific plasma membrane Ca(2+)-ATPase (PMCA) antagonist, suggesting that Phe might increase [Ca(2+)](i) efflux throught modulating PMCA. These findings were further supported by the facts that Phe could increase membrance (45)Ca-uptake capability and PMCA activity. In contrast, treatment of KBR7943 or thapsigargin, antagonists to Na/Ca Exchanger (NCX) and Sarco/Endoplasmic reticulum Ca(2+)-ATPase (SERCA), respectively, did not elicit any changes in [Ca(2+)](i). Specific siRNA against PMCA had an effect similar to vanadate. Since the brain injury induced by phenylalaninemia was thought to be a chronic process, we cultured cortical neurons in the presence of Phe for 2 weeks and measured [Ca(2+)](i), PMCA activity and (45)Ca-uptake capability at days 3, 7, 9 and 14, respectively. PMCA activity and (45)Ca-uptake capability decreased from day 9, at the same time [Ca(2+)](i) increase was observed. In conclusion, PMCA participate in regulating Phe-induced initial rapid decrease in [Ca(2+)](i) and subsequent long-term increase in [Ca(2+)](i).
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Affiliation(s)
- Y G Yu
- Department of Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Institute for Pediatric Research, Shanghai, China.
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38
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Afroze T, Sadi AM, Momen MA, Gu S, Heximer S, Husain M. c-Myb-dependent inositol 1,4,5-trisphosphate receptor type-1 expression in vascular smooth muscle cells. Arterioscler Thromb Vasc Biol 2007; 27:1305-11. [PMID: 17363689 DOI: 10.1161/atvbaha.107.142059] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The IP3 receptor-1 (IP3R1) mediates Ca2+ signals critical to vascular smooth muscle cell (VSMC) proliferation. The cell cycle-associated transcription factor c-Myb increases Ca2+ at the G1/S transition. Here we show the mechanism through which c-Myb regulates expression of IP3R1. METHODS & RESULTS Ribonuclease protection confirmed transcriptional start (TS), and qRT-PCR revealed a 6-fold increase in IP3R1 mRNA as immortalized VSMC progress from G0 to G1/S. A c-Myb neutralizing antibody decreased IP3R1 mRNA expression 3-fold, and abolished the 3.4-fold increase in IP3R1 protein observed at G1/S. Primary aortic VSMCs in culture and proliferating carotid VSMCs in vivo showed similar regulation of IP3R1 mRNA and protein. Sequence analysis of a 3.1-Kb mouse IP3R1 promoter revealed 17 putative c-Myb binding sites. Reporter assays demonstrated a 2-fold increase in promoter activity in G1/S- versus G0-synchronized VSMCs, which was abolished by functional c-Myb knockdown or deletion of promoter sequences upstream and downstream of TS. Point mutations in Myb sites-13 or -15 significantly blunted G1/S-specific promoter induction in both immortalized and primary VSMCs. Gel shift and ChIP confirmed binding of c-Myb to sites-13 and -15 in G1/S stage VSMCs. CONCLUSION c-Myb regulates cell cycle-associated IP3R1 transcription in VSMCs via specific highly conserved Myb-binding sites in the IP3R1 promoter.
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MESH Headings
- Animals
- Calcium/metabolism
- Calcium Channels/genetics
- Calcium Channels/metabolism
- Carotid Arteries/surgery
- Carotid Artery Diseases/genetics
- Carotid Artery Diseases/metabolism
- Carotid Artery Diseases/physiopathology
- Cell Cycle/physiology
- Cell Line
- Cell Proliferation
- Chromatin Immunoprecipitation
- Conserved Sequence
- DNA/metabolism
- Disease Models, Animal
- Electrophoretic Mobility Shift Assay
- Genes, Reporter
- Inositol 1,4,5-Trisphosphate Receptors
- Luciferases
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/metabolism
- Mice
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Mutation
- Myocytes, Smooth Muscle/metabolism
- Promoter Regions, Genetic
- Proto-Oncogene Proteins c-myb/metabolism
- RNA, Messenger/metabolism
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/metabolism
- Sequence Analysis, DNA
- Transcription, Genetic
- Transfection
- Up-Regulation
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Affiliation(s)
- Talat Afroze
- Division of Cell and Molecular Biology, Toronto General Hospital Research Institute, Toronto, Ontario, Canada
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39
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Choi J, Chiang A, Taulier N, Gros R, Pirani A, Husain M. A calmodulin-binding site on cyclin E mediates Ca2+-sensitive G1/s transitions in vascular smooth muscle cells. Circ Res 2006; 98:1273-81. [PMID: 16627785 DOI: 10.1161/01.res.0000223059.19250.91] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Calcium transients are known to control several transition points in the eukaryotic cell cycle. For example, we have previously shown that a coordinate elevation in the intracellular free calcium ion concentration is required for G1- to S-phase cell cycle progression in vascular smooth muscle cells (VSMC). However, the molecular basis for this Ca2+ sensitivity was not known. Using buffers with differing [Ca2+], we found that the kinase activity of mouse and human cyclin E/CDK2, but not other G1/S-associated cell cycle complexes, was responsive to physiological changes in [Ca2+]. We next determined that this Ca2+-responsive kinase activity was dependent on a direct interaction between calmodulin (CaM), one of the major Ca2+-signal transducers of eukaryotic cells, and cyclin E. Pharmacological inhibition of CaM abrogated the Ca2+ sensitivity of cyclin E/CDK2 and retarded mouse VSMC proliferation by causing G1 arrest. We next defined the presence of a highly conserved 22 amino acid N-terminal CaM-binding motif in mammalian cyclin E genes (dissociation constant, 1.5+/-0.1 micromol/L) and showed its essential role in mediating Ca2+-sensitive kinase activity of cyclin E/CDK2. Mutant human cyclin E protein, lacking this CaM-binding motif, was incapable of binding CaM or responding to [Ca2+]. Taken together, these findings reveal CaM-dependent cyclin E/CDK2 activity as a mediator of the known Ca2+ sensitivity of the G1/S transition of VSMC.
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Affiliation(s)
- Jaehyun Choi
- Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, Faculty of Medicine, Department of Medicine, University of Toronto, Ontario, Canada
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40
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Lee WJ, Monteith GR, Roberts-Thomson SJ. Calcium transport and signaling in the mammary gland: targets for breast cancer. Biochim Biophys Acta Rev Cancer 2005; 1765:235-55. [PMID: 16410040 DOI: 10.1016/j.bbcan.2005.12.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2005] [Revised: 12/01/2005] [Accepted: 12/01/2005] [Indexed: 12/30/2022]
Abstract
The mammary gland is subjected to extensive calcium loads during lactation to support the requirements of milk calcium enrichment. Despite the indispensable nature of calcium homeostasis and signaling in regulating numerous biological functions, the mechanisms by which systemic calcium is transported into milk by the mammary gland are far from completely understood. Furthermore, the implications of calcium signaling in terms of regulating proliferation, differentiation and apoptosis in the breast are currently uncertain. Deregulation of calcium homeostasis and signaling is associated with mammary gland pathophysiology and as such, calcium transporters, channels and binding proteins represent potential drug targets for the treatment of breast cancer.
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Affiliation(s)
- Won Jae Lee
- School of Pharmacy, Steele Building, The University of Queensland, Brisbane 4072, Australia
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41
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Khanna A. Concerted effect of transforming growth factor-β, cyclin inhibitor p21, and c-mycon smooth muscle cell proliferation. Am J Physiol Heart Circ Physiol 2004; 286:H1133-40. [PMID: 14766678 DOI: 10.1152/ajpheart.00462.2003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Increased aortic smooth muscle cell (SMC) proliferation is a key event in the pathogenesis of atherosclerosis. Transforming growth factor-β (TGF-β) is one of the potent inhibitors of SMC proliferation. The purpose of this study was 1) to explore the effect of TGF-β inhibition on proliferation of SMC and expression of growth regulatory molecules like p21 and c- myc and 2) to determine whether restoration of cell cycle regulatory molecules normalizes the altered proliferation. To test the role of TGF-β in SMC proliferation, using antisense plasmid DNA, we inhibited TGF-β gene from aortic SMC, which resulted in a significant increase ( P < 0.03) in proliferation (studied by quantifying new DNA synthesis with [3H]thymidine uptake assay). In TGF-β-altered SMC (TASMC), the mRNA expression (studied by RT-PCR) of c- myc was increased whereas that of the cyclin inhibitor p21 was completely inhibited. Using p21 sense plasmid DNA, we transfected p21 gene in TASMC, which restored p21 mRNA and protein expression and decreased proliferation ( P < 0.002) in TASMC. Similar treatment with c- myc antisense oligonucleotides significantly ( P < 0.001) decreased the proliferation of TASMC. TASMC also exhibited alteration in morphological changes in SMC but returned to normal with treatment of p21 and TGF-β sense plasmid DNA. Two-dimensional gel electrophoresis analysis of SMC and TASMC demonstrated differential expression of proteins relevant to cellular proliferation and atherosclerosis. This study uniquely analyzes the effect of TGF-β at the molecular level on proliferation of SMC and on cell cycle regulatory molecules, implicating their potential role in the pathogenesis of atherosclerosis.
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Affiliation(s)
- Ashwani Khanna
- Dept. of Medicine, Medical College of Wisconsin, 8701 Watertown Plank Rd., Milwaukee, WI 53226, USA.
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42
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Yang LL, Gros R, Kabir MG, Sadi A, Gotlieb AI, Husain M, Stewart DJ. Conditional Cardiac Overexpression of Endothelin-1 Induces Inflammation and Dilated Cardiomyopathy in Mice. Circulation 2004; 109:255-61. [PMID: 14718401 DOI: 10.1161/01.cir.0000105701.98663.d4] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
Myocardial expression of endothelin-1 (ET-1) and its receptors ET
A
and ET
B
is increased in heart failure. However, the role of ET-1 and its signaling pathways in the pathogenesis of myocardial diseases is unclear.
Methods and Results—
Human ET-1 cDNA was placed downstream of a promoter responsive to a doxycycline (DOX)-regulated transcriptional activator (tTA). This line (ET
+
) was bred with one harboring cardiac myocyte-restricted expression of tTA (αMHC-tTA). Myocardial ET-1 peptide levels were significantly increased in binary transgenic (BT, ET
+
/tTA
+
) compared with nonbinary transgenic (NBT, ET
+
/tTA
−
; ET
−
/tTA
+
; ET
−
/tTA
−
) or DOX-treated BT littermates (40.1±4.7 versus 2.6±1.2 fmol/mL,
P
<0.003). BT mice demonstrated progressive mortality between 5 and 11 weeks after DOX withdrawal, associated with left ventricular dilatation and contractile dysfunction (peak +dP/dT, 4673±468 versus 5585±658 mm Hg/s,
P
<0.05). An interstitial inflammatory infiltrate, including macrophages and T lymphocytes, was evident in the myocardium of BT mice, associated with sequential increases in nuclear factor-κB translocation and expression of tumor necrosis factor-α, interferon-γ, interleukin-1 and interleukin-6. Significant prolongation of survival was observed with the combined ET
A
/ET
B
antagonist LU420627 (n=8,
P
<0.05) in BT mice but not the ET
A
-selective antagonist LU135252 (n=5,
P
=0.9), consistent with an important role for ET
B
in this model.
Conclusions—
These are the first data to demonstrate that cardiac overexpression of ET-1 is sufficient to cause increased expression of inflammatory cytokines and an inflammatory cardiomyopathy leading to heart failure and death.
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Affiliation(s)
- Li L Yang
- Heart and Stroke Richard Lewar Centre of Excellence, University of Toronto, Ontario, Canada
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43
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Gros R, Afroze T, You XM, Kabir G, Van Wert R, Kalair W, Hoque AE, Mungrue IN, Husain M. Plasma membrane calcium ATPase overexpression in arterial smooth muscle increases vasomotor responsiveness and blood pressure. Circ Res 2003; 93:614-21. [PMID: 12933703 DOI: 10.1161/01.res.0000092142.19896.d9] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In vascular smooth muscle cells (SMCs), several mechanisms act in concert to regulate the intracellular calcium concentration [Ca2+]i, which may in turn affect vascular tone. One such mechanism is the extrusion of Ca2+ by the plasma membrane calcium ATPase (PMCA). To address, in particular, the role of the neuronal nitric oxide synthase (nNOS)-associating isoform PMCA4b in regulating vascular tone, a doxycycline-responsive transgene for human PMCA4b was overexpressed in arterial SMCs of mice. Overexpression of hPMCA4b resulted in a 2-fold increase in total aortic PMCA4 protein expression and significant real-time RT-PCR-documented differences in the levels of endogenous mouse PMCA1, PMCA4, SERCA2, and IP3R1 gene expression in arterial SMCs. Whereas no significant difference in basal [Ca2+]i or Ca2+ sensitivity was observed in vascular SMCs or mesenteric arteries, respectively, from hPMCA4b-overexpressing versus control mice, hPMCA4b-overexpressing mice revealed a reduced set-point and increased extent of myogenic response and heightened sensitivity to vasoconstrictors. Treatment of arteries with an nNOS inhibitor resulted in a reduced set-point and increased extent of the myogenic response in control but not hPMCA4b-overexpressing mice. Moreover, aortic SMCs from hPMCA4b-overexpressing mice exhibited reduced levels of cGMP under both basal and phenylephrine-stimulated conditions. These changes were associated with significant doxycycline-reversible elevations in blood pressure. Taken together, these data show that overexpression of hPMCA4b in arterial SMCs increases vascular reactivity and blood pressure, an effect that may be mediated in part by negative regulation of nNOS.
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MESH Headings
- Animals
- Aorta/enzymology
- Arginine/analogs & derivatives
- Arginine/pharmacology
- Blood Pressure/drug effects
- Blood Pressure/physiology
- Calcium/metabolism
- Calcium-Transporting ATPases/genetics
- Calcium-Transporting ATPases/metabolism
- Cation Transport Proteins
- Cell Line
- Cells, Cultured
- Cyclic GMP/metabolism
- Dose-Response Relationship, Drug
- Doxycycline/pharmacology
- Enzyme Inhibitors/pharmacology
- Female
- Gene Expression Regulation, Enzymologic/drug effects
- Genotype
- Humans
- In Vitro Techniques
- Isoenzymes/genetics
- Isoenzymes/metabolism
- Male
- Mesenteric Arteries/drug effects
- Mesenteric Arteries/physiology
- Mice
- Mice, Transgenic
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/metabolism
- NG-Nitroarginine Methyl Ester/pharmacology
- Nitric Oxide Synthase/antagonists & inhibitors
- Nitric Oxide Synthase Type I
- Phenylephrine/pharmacology
- Plasma Membrane Calcium-Transporting ATPases
- Potassium Chloride/pharmacology
- Vasoconstriction/drug effects
- Vasomotor System/drug effects
- Vasomotor System/physiology
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Affiliation(s)
- Robert Gros
- Heart & Stroke Richard Lewar Center of Excellence, Department of Medicine, University of Toronto, and Toronto General Hospital Research Institute, Toronto, Ontario, Canada
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