1
|
Cade BE, Lee J, Sofer T, Wang H, Zhang M, Chen H, Gharib SA, Gottlieb DJ, Guo X, Lane JM, Liang J, Lin X, Mei H, Patel SR, Purcell SM, Saxena R, Shah NA, Evans DS, Hanis CL, Hillman DR, Mukherjee S, Palmer LJ, Stone KL, Tranah GJ, Abecasis GR, Boerwinkle EA, Correa A, Cupples LA, Kaplan RC, Nickerson DA, North KE, Psaty BM, Rotter JI, Rich SS, Tracy RP, Vasan RS, Wilson JG, Zhu X, Redline S. Whole-genome association analyses of sleep-disordered breathing phenotypes in the NHLBI TOPMed program. Genome Med 2021; 13:136. [PMID: 34446064 PMCID: PMC8394596 DOI: 10.1186/s13073-021-00917-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 05/28/2021] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Sleep-disordered breathing is a common disorder associated with significant morbidity. The genetic architecture of sleep-disordered breathing remains poorly understood. Through the NHLBI Trans-Omics for Precision Medicine (TOPMed) program, we performed the first whole-genome sequence analysis of sleep-disordered breathing. METHODS The study sample was comprised of 7988 individuals of diverse ancestry. Common-variant and pathway analyses included an additional 13,257 individuals. We examined five complementary traits describing different aspects of sleep-disordered breathing: the apnea-hypopnea index, average oxyhemoglobin desaturation per event, average and minimum oxyhemoglobin saturation across the sleep episode, and the percentage of sleep with oxyhemoglobin saturation < 90%. We adjusted for age, sex, BMI, study, and family structure using MMSKAT and EMMAX mixed linear model approaches. Additional bioinformatics analyses were performed with MetaXcan, GIGSEA, and ReMap. RESULTS We identified a multi-ethnic set-based rare-variant association (p = 3.48 × 10-8) on chromosome X with ARMCX3. Additional rare-variant associations include ARMCX3-AS1, MRPS33, and C16orf90. Novel common-variant loci were identified in the NRG1 and SLC45A2 regions, and previously associated loci in the IL18RAP and ATP2B4 regions were associated with novel phenotypes. Transcription factor binding site enrichment identified associations with genes implicated with respiratory and craniofacial traits. Additional analyses identified significantly associated pathways. CONCLUSIONS We have identified the first gene-based rare-variant associations with objectively measured sleep-disordered breathing traits. Our results increase the understanding of the genetic architecture of sleep-disordered breathing and highlight associations in genes that modulate lung development, inflammation, respiratory rhythmogenesis, and HIF1A-mediated hypoxic response.
Collapse
Affiliation(s)
- Brian E. Cade
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.66859.34Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142 USA
| | - Jiwon Lee
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA
| | - Tamar Sofer
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA
| | - Heming Wang
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.66859.34Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142 USA
| | - Man Zhang
- grid.411024.20000 0001 2175 4264Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201 USA
| | - Han Chen
- grid.267308.80000 0000 9206 2401Human Genetics Center, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030 USA ,grid.267308.80000 0000 9206 2401Center for Precision Health, School of Public Health and School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030 USA
| | - Sina A. Gharib
- grid.34477.330000000122986657Computational Medicine Core, Center for Lung Biology, UW Medicine Sleep Center, Division of Pulmonary, Critical Care and Sleep Medicine, University of Washington, Seattle, WA 98195 USA
| | - Daniel J. Gottlieb
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.410370.10000 0004 4657 1992VA Boston Healthcare System, Boston, MA 02132 USA
| | - Xiuqing Guo
- grid.239844.00000 0001 0157 6501The Institute for Translational Genomics and Population Sciences, Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA 90502 USA
| | - Jacqueline M. Lane
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.66859.34Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142 USA ,grid.32224.350000 0004 0386 9924Center for Genomic Medicine and Department of Anesthesia, Pain, and Critical Care Medicine, Massachusetts General Hospital, Boston, MA 02114 USA
| | - Jingjing Liang
- grid.67105.350000 0001 2164 3847Department of Population and Quantitative Health Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 USA
| | - Xihong Lin
- grid.38142.3c000000041936754XDepartment of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA 02115 USA
| | - Hao Mei
- grid.410721.10000 0004 1937 0407Department of Data Science, University of Mississippi Medical Center, Jackson, MS 29216 USA
| | - Sanjay R. Patel
- grid.21925.3d0000 0004 1936 9000Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213 USA
| | - Shaun M. Purcell
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.66859.34Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142 USA
| | - Richa Saxena
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.66859.34Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142 USA ,grid.32224.350000 0004 0386 9924Center for Genomic Medicine and Department of Anesthesia, Pain, and Critical Care Medicine, Massachusetts General Hospital, Boston, MA 02114 USA
| | - Neomi A. Shah
- grid.59734.3c0000 0001 0670 2351Division of Pulmonary, Critical Care and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029 USA
| | - Daniel S. Evans
- grid.17866.3e0000000098234542California Pacific Medical Center Research Institute, San Francisco, CA 94107 USA
| | - Craig L. Hanis
- grid.267308.80000 0000 9206 2401Human Genetics Center, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030 USA
| | - David R. Hillman
- grid.3521.50000 0004 0437 5942Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Perth, Western Australia 6009 Australia
| | - Sutapa Mukherjee
- Sleep Health Service, Respiratory and Sleep Services, Southern Adelaide Local Health Network, Adelaide, South Australia Australia ,grid.1014.40000 0004 0367 2697Adelaide Institute for Sleep Health, Flinders University, Adelaide, South Australia Australia
| | - Lyle J. Palmer
- grid.1010.00000 0004 1936 7304School of Public Health, University of Adelaide, Adelaide, South Australia 5000 Australia
| | - Katie L. Stone
- grid.17866.3e0000000098234542California Pacific Medical Center Research Institute, San Francisco, CA 94107 USA
| | - Gregory J. Tranah
- grid.17866.3e0000000098234542California Pacific Medical Center Research Institute, San Francisco, CA 94107 USA
| | | | - Gonçalo R. Abecasis
- grid.214458.e0000000086837370Department of Biostatistics and Center for Statistical Genetics, University of Michigan School of Public Health, Ann Arbor, MI 48109 USA
| | - Eric A. Boerwinkle
- grid.267308.80000 0000 9206 2401Human Genetics Center, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030 USA ,grid.39382.330000 0001 2160 926XHuman Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030 USA
| | - Adolfo Correa
- grid.410721.10000 0004 1937 0407Department of Medicine, University of Mississippi Medical Center, Jackson, MS 39216 USA ,Jackson Heart Study, Jackson, MS 39216 USA
| | - L. Adrienne Cupples
- grid.189504.10000 0004 1936 7558Department of Biostatistics, Boston University School of Public Health, Boston, MA 02118 USA ,grid.510954.c0000 0004 0444 3861Framingham Heart Study, Framingham, MA 01702 USA
| | - Robert C. Kaplan
- grid.251993.50000000121791997Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, New York, 10461 USA
| | - Deborah A. Nickerson
- grid.34477.330000000122986657Department of Genome Sciences, University of Washington, Seattle, WA 98195 USA ,grid.34477.330000000122986657Northwest Genomics Center, Seattle, WA 98105 USA
| | - Kari E. North
- grid.410711.20000 0001 1034 1720Department of Epidemiology and Carolina Center of Genome Sciences, University of North Carolina, Chapel Hill, NC 27514 USA
| | - Bruce M. Psaty
- grid.34477.330000000122986657Cardiovascular Health Study, Departments of Medicine, Epidemiology, and Health Services, University of Washington, Seattle, WA 98101 USA ,grid.488833.c0000 0004 0615 7519Kaiser Permanente Washington Health Research Institute, Seattle, WA 98101 USA
| | - Jerome I. Rotter
- grid.239844.00000 0001 0157 6501The Institute for Translational Genomics and Population Sciences, Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA 90502 USA
| | - Stephen S. Rich
- grid.27755.320000 0000 9136 933XCenter for Public Health Genomics, University of Virginia, Charlottesville, VA 22908 USA
| | - Russell P. Tracy
- grid.59062.380000 0004 1936 7689Department of Pathology, University of Vermont, Colchester, VT 05405 USA
| | - Ramachandran S. Vasan
- grid.510954.c0000 0004 0444 3861Framingham Heart Study, Framingham, MA 01702 USA ,grid.189504.10000 0004 1936 7558Sections of Preventive Medicine and Epidemiology and Cardiology, Department of Medicine, Boston University School of Medicine, Boston, MA 02118 USA ,grid.189504.10000 0004 1936 7558Department of Epidemiology, Boston University School of Public Health, Boston, MA 02118 USA
| | - James G. Wilson
- grid.410721.10000 0004 1937 0407Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS 39216 USA
| | - Xiaofeng Zhu
- grid.67105.350000 0001 2164 3847Department of Population and Quantitative Health Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 USA
| | - Susan Redline
- grid.38142.3c000000041936754XDivision of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115 USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA 02115 USA ,grid.239395.70000 0000 9011 8547Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA
| | | |
Collapse
|
2
|
Pointer TC, Gorelick FS, Desir GV. Renalase: A Multi-Functional Signaling Molecule with Roles in Gastrointestinal Disease. Cells 2021; 10:cells10082006. [PMID: 34440775 PMCID: PMC8391834 DOI: 10.3390/cells10082006] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/21/2021] [Accepted: 07/28/2021] [Indexed: 01/11/2023] Open
Abstract
The survival factor renalase (RNLS) is a recently discovered secretory protein with potent prosurvival and anti-inflammatory effects. Several evolutionarily conserved RNLS domains are critical to its function. These include a 20 aa site that encodes for its prosurvival effects. Its prosurvival effects are shown in GI disease models including acute cerulein pancreatitis. In rodent models of pancreatic cancer and human cancer tissues, increased RNLS expression promotes cancer cell survival but shortens life expectancy. This 37 kD protein can regulate cell signaling as an extracellular molecule and probably also at intracellular sites. Extracellular RNLS signals through a specific plasma membrane calcium export transporter; this interaction appears most relevant to acute injury and cancer. Preliminary studies using RNLS agonists and antagonists, as well as various preclinical disease models, suggest that the immunologic and prosurvival effects of RNLS will be relevant to diverse pathologies that include acute organ injuries and select cancers. Future studies should define the roles of RNLS in intestinal diseases, characterizing the RNLS-activated pathways linked to cell survival and developing therapeutic agents that can increase or decrease RNLS in relevant clinical settings.
Collapse
Affiliation(s)
- Thomas C. Pointer
- Department of Medicine, Yale School of Medicine, 333 Cedar St., New Haven, CT 06510, USA; (T.C.P.); (F.S.G.)
| | - Fred S. Gorelick
- Department of Medicine, Yale School of Medicine, 333 Cedar St., New Haven, CT 06510, USA; (T.C.P.); (F.S.G.)
- VA Connecticut Health Care System, 950 Campbell Avenue, West Haven, CT 06516, USA
| | - Gary V. Desir
- Department of Medicine, Yale School of Medicine, 333 Cedar St., New Haven, CT 06510, USA; (T.C.P.); (F.S.G.)
- VA Connecticut Health Care System, 950 Campbell Avenue, West Haven, CT 06516, USA
- Correspondence:
| |
Collapse
|
3
|
Cardiac-specific inducible overexpression of human plasma membrane Ca 2+ ATPase 4b is cardioprotective and improves survival in mice following ischemic injury. Clin Sci (Lond) 2018; 132:641-654. [PMID: 29487197 DOI: 10.1042/cs20171337] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 01/09/2023]
Abstract
Background: Heart failure (HF) is associated with reduced expression of plasma membrane Ca2+-ATPase 4 (PMCA4). Cardiac-specific overexpression of human PMCA4b in mice inhibited nNOS activity and reduced cardiac hypertrophy by inhibiting calcineurin. Here we examine temporally regulated cardiac-specific overexpression of hPMCA4b in mouse models of myocardial ischemia reperfusion injury (IRI) ex vivo, and HF following experimental myocardial infarction (MI) in vivoMethods and results: Doxycycline-regulated cardiomyocyte-specific overexpression and activity of hPMCA4b produced adaptive changes in expression levels of Ca2+-regulatory genes, and induced hypertrophy without significant differences in Ca2+ transients or diastolic Ca2+ concentrations. Total cardiac NOS and nNOS-specific activities were reduced in mice with cardiac overexpression of hPMCA4b while nNOS, eNOS and iNOS protein levels did not differ. hMPCA4b-overexpressing mice also exhibited elevated systolic blood pressure vs. controls, with increased contractility and lusitropy in vivo In isolated hearts undergoing IRI, hPMCA4b overexpression was cardioprotective. NO donor-treated hearts overexpressing hPMCA4b showed reduced LVDP and larger infarct size versus vehicle-treated hearts undergoing IRI, demonstrating that the cardioprotective benefits of hPMCA4b-repressed nNOS are lost by restoring NO availability. Finally, both pre-existing and post-MI induction of hPMCA4b overexpression reduced infarct expansion and improved survival from HF.Conclusions: Cardiac PMCA4b regulates nNOS activity, cardiac mass and contractility, such that PMCA4b overexpression preserves cardiac function following IRI, heightens cardiac performance and limits infarct progression, cardiac hypertrophy and HF, even when induced late post-MI. These data identify PMCA4b as a novel therapeutic target for IRI and HF.
Collapse
|
4
|
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.
Collapse
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
| |
Collapse
|
5
|
The effects of anti-hypertensive drugs and the mechanism of hypertension in vascular smooth muscle cell-specific ATP2B1 knockout mice. Hypertens Res 2017; 41:80-87. [PMID: 29046519 PMCID: PMC5811637 DOI: 10.1038/hr.2017.92] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 06/21/2017] [Accepted: 07/27/2017] [Indexed: 01/11/2023]
Abstract
ATP2B1 is a gene associated with hypertension. We reported previously that mice lacking ATP2B1 in vascular smooth muscle cells (VSMC ATP2B1 KO mice) exhibited high blood pressure and increased intracellular calcium concentration. The present study was designed to investigate whether lack of the ATP2B1 gene causes a higher response to calcium channel blockers (CCBs) than to other types of anti-hypertensive drugs. Both VSMC ATP2B1 KO and control mice were administered anti-hypertensive drugs while monitoring blood pressure shifts. We also examined the association of nitric oxide synthase (NOS) activity in those mice to investigate whether another mechanism of hypertension existed. VSMC ATP2B1 KO mice exhibited significantly greater anti-hypertensive effects with a single injection of nicardipine, but the effects of an angiotensin II receptor blocker (ARB), an α-blocker and amlodipine on blood pressure were all similar to control mice. However, long-term treatment with amlodipine, but not an ARB, significantly decreased the blood pressure of KO mice compared with control mice. Both mRNA and protein expression levels of the L-type calcium channel were significantly upregulated in KO VSMCs. There were no alterations in neural NOS protein expression of VSMCs or in urinary NO production between the two groups. VSMC ATP2B1 KO mice had a higher response to CCBs for blood pressure-lowering effects than other anti-hypertensive drugs. These results mean that increased intracellular calcium concentration in VSMCs due to lack of ATP2B1 and subsequent activation of L-type calcium channels mainly affects blood pressure and suggests increased susceptibility to CCBs in this type of hypertension.
Collapse
|
6
|
Stafford N, Wilson C, Oceandy D, Neyses L, Cartwright EJ. The Plasma Membrane Calcium ATPases and Their Role as Major New Players in Human Disease. Physiol Rev 2017; 97:1089-1125. [PMID: 28566538 DOI: 10.1152/physrev.00028.2016] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 01/20/2017] [Accepted: 01/23/2017] [Indexed: 02/07/2023] Open
Abstract
The Ca2+ extrusion function of the four mammalian isoforms of the plasma membrane calcium ATPases (PMCAs) is well established. There is also ever-increasing detail known of their roles in global and local Ca2+ homeostasis and intracellular Ca2+ signaling in a wide variety of cell types and tissues. It is becoming clear that the spatiotemporal patterns of expression of the PMCAs and the fact that their abundances and relative expression levels vary from cell type to cell type both reflect and impact on their specific functions in these cells. Over recent years it has become increasingly apparent that these genes have potentially significant roles in human health and disease, with PMCAs1-4 being associated with cardiovascular diseases, deafness, autism, ataxia, adenoma, and malarial resistance. This review will bring together evidence of the variety of tissue-specific functions of PMCAs and will highlight the roles these genes play in regulating normal physiological functions and the considerable impact the genes have on human disease.
Collapse
Affiliation(s)
- Nicholas Stafford
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| | - Claire Wilson
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| | - Delvac Oceandy
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| | - Ludwig Neyses
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| | - Elizabeth J Cartwright
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| |
Collapse
|
7
|
Cade BE, Chen H, Stilp AM, Gleason KJ, Sofer T, Ancoli-Israel S, Arens R, Bell GI, Below JE, Bjonnes AC, Chun S, Conomos MP, Evans DS, Johnson WC, Frazier-Wood AC, Lane JM, Larkin EK, Loredo JS, Post WS, Ramos AR, Rice K, Rotter JI, Shah NA, Stone KL, Taylor KD, Thornton TA, Tranah GJ, Wang C, Zee PC, Hanis CL, Sunyaev SR, Patel SR, Laurie CC, Zhu X, Saxena R, Lin X, Redline S. Genetic Associations with Obstructive Sleep Apnea Traits in Hispanic/Latino Americans. Am J Respir Crit Care Med 2016; 194:886-897. [PMID: 26977737 PMCID: PMC5074655 DOI: 10.1164/rccm.201512-2431oc] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/14/2016] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Obstructive sleep apnea is a common disorder associated with increased risk for cardiovascular disease, diabetes, and premature mortality. Although there is strong clinical and epidemiologic evidence supporting the importance of genetic factors in influencing obstructive sleep apnea, its genetic basis is still largely unknown. Prior genetic studies focused on traits defined using the apnea-hypopnea index, which contains limited information on potentially important genetically determined physiologic factors, such as propensity for hypoxemia and respiratory arousability. OBJECTIVES To define novel obstructive sleep apnea genetic risk loci for obstructive sleep apnea, we conducted genome-wide association studies of quantitative traits in Hispanic/Latino Americans from three cohorts. METHODS Genome-wide data from as many as 12,558 participants in the Hispanic Community Health Study/Study of Latinos, Multi-Ethnic Study of Atherosclerosis, and Starr County Health Studies population-based cohorts were metaanalyzed for association with the apnea-hypopnea index, average oxygen saturation during sleep, and average respiratory event duration. MEASUREMENTS AND MAIN RESULTS Two novel loci were identified at genome-level significance (rs11691765, GPR83, P = 1.90 × 10-8 for the apnea-hypopnea index, and rs35424364; C6ORF183/CCDC162P, P = 4.88 × 10-8 for respiratory event duration) and seven additional loci were identified with suggestive significance (P < 5 × 10-7). Secondary sex-stratified analyses also identified one significant and several suggestive associations. Multiple loci overlapped genes with biologic plausibility. CONCLUSIONS These are the first genome-level significant findings reported for obstructive sleep apnea-related physiologic traits in any population. These findings identify novel associations in inflammatory, hypoxia signaling, and sleep pathways.
Collapse
Affiliation(s)
- Brian E. Cade
- Division of Sleep and Circadian Disorders and
- Division of Sleep Medicine and
| | - Han Chen
- Department of Biostatistics, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | - Adrienne M. Stilp
- Department of Biostatistics, University of Washington, Seattle, Washington
| | | | - Tamar Sofer
- Department of Biostatistics, University of Washington, Seattle, Washington
| | - Sonia Ancoli-Israel
- Department of Medicine and
- Department of Psychiatry, University of California, San Diego, California
- Department of Veterans Affairs San Diego Center of Excellence for Stress and Mental Health, San Diego, California
| | - Raanan Arens
- The Children’s Hospital at Montefiore, Division of Respiratory and Sleep Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Graeme I. Bell
- Section of Adult and Pediatric Endocrinology, Diabetes, and Metabolism, The University of Chicago, Chicago, Illinois
| | - Jennifer E. Below
- Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Andrew C. Bjonnes
- Division of Genetics, Brigham and Women’s Hospital, Boston, Massachusetts
| | - Sung Chun
- Division of Genetics, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Medical Sciences, Harvard Medical School, Boston, Massachusetts
| | - Matthew P. Conomos
- Department of Biostatistics, University of Washington, Seattle, Washington
| | - Daniel S. Evans
- California Pacific Medical Center Research Institute, San Francisco, California
| | - W. Craig Johnson
- Department of Biostatistics, University of Washington, Seattle, Washington
| | | | - Jacqueline M. Lane
- Division of Sleep and Circadian Disorders and
- Division of Sleep Medicine and
- Center for Human Genetic Research and Department of Anesthesia, Pain, and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts
| | - Emma K. Larkin
- Department of Medicine, Division of Allergy, Pulmonary and Critical Care, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Jose S. Loredo
- Division of Pulmonary Critical Care and Sleep Medicine, Department of Medicine, UC San Diego School of Medicine, La Jolla, California
| | - Wendy S. Post
- Division of Cardiology, Johns Hopkins University, Baltimore, Maryland
| | - Alberto R. Ramos
- Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida
| | - Ken Rice
- Department of Biostatistics, University of Washington, Seattle, Washington
| | - Jerome I. Rotter
- Institute for Translational Genomics and Population Sciences, Los Angeles BioMedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | - Neomi A. Shah
- Department of Medicine, Montefiore Medical Center, Bronx, New York
| | - Katie L. Stone
- California Pacific Medical Center Research Institute, San Francisco, California
| | - Kent D. Taylor
- Institute for Translational Genomics and Population Sciences, Los Angeles BioMedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | | | - Gregory J. Tranah
- California Pacific Medical Center Research Institute, San Francisco, California
| | - Chaolong Wang
- Department of Biostatistics, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
- Genome Institute of Singapore, Singapore
| | - Phyllis C. Zee
- Department of Neurology and Sleep Medicine Center, Northwestern University, Chicago, Illinois
| | - Craig L. Hanis
- Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Shamil R. Sunyaev
- Division of Genetics, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Medical Sciences, Harvard Medical School, Boston, Massachusetts
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts
| | - Sanjay R. Patel
- Division of Sleep and Circadian Disorders and
- Division of Sleep Medicine and
- Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts; and
| | - Cathy C. Laurie
- Department of Biostatistics, University of Washington, Seattle, Washington
| | - Xiaofeng Zhu
- Department of Epidemiology and Biostatistics, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Richa Saxena
- Division of Sleep and Circadian Disorders and
- Center for Human Genetic Research and Department of Anesthesia, Pain, and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts
| | - Xihong Lin
- Department of Biostatistics, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | - Susan Redline
- Division of Sleep and Circadian Disorders and
- Division of Sleep Medicine and
- Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts; and
| |
Collapse
|
8
|
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: 14] [Impact Index Per Article: 1.8] [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.
Collapse
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.
| |
Collapse
|
9
|
Strehler EE. Plasma membrane calcium ATPases: From generic Ca(2+) sump pumps to versatile systems for fine-tuning cellular Ca(2.). Biochem Biophys Res Commun 2015; 460:26-33. [PMID: 25998731 DOI: 10.1016/j.bbrc.2015.01.121] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 01/21/2015] [Indexed: 10/23/2022]
Abstract
The plasma membrane calcium ATPases (PMCAs) are ATP-driven primary ion pumps found in all eukaryotic cells. They are the major high-affinity calcium extrusion system for expulsion of Ca(2+) ions from the cytosol and help restore the low resting levels of intracellular [Ca(2+)] following the temporary elevation of Ca(2+) generated during Ca(2+) signaling. Due to their essential role in the maintenance of cellular Ca(2+) homeostasis they were initially thought to be "sump pumps" for Ca(2+) removal needed by all cells to avoid eventual calcium overload. The discovery of multiple PMCA isoforms and alternatively spliced variants cast doubt on this simplistic assumption, and revealed instead that PMCAs are integral components of highly regulated multi-protein complexes fulfilling specific roles in calcium-dependent signaling originating at the plasma membrane. Biochemical, genetic, and physiological studies in gene-manipulated and mutant animals demonstrate the important role played by specific PMCAs in distinct diseases including those affecting the peripheral and central nervous system, cardiovascular disease, and osteoporosis. Human PMCA gene mutations and allelic variants associated with specific disorders continue to be discovered and underline the crucial role of different PMCAs in particular cells, tissues and organs.
Collapse
Affiliation(s)
- Emanuel E Strehler
- Department of Biochemistry and Molecular Biology, Guggenheim 16-11A1, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA.
| |
Collapse
|
10
|
Impaired nitric oxide production and increased blood pressure in systemic heterozygous ATP2B1 null mice. J Hypertens 2015; 32:1415-23; discussion 1423. [PMID: 24805951 DOI: 10.1097/hjh.0000000000000206] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND In the 'Millennium Genome Project', we identified ATP2B1 as a gene responsible for hypertension through single-nucleotide polymorphism analysis. The ATP2B1 gene encodes the plasma membrane calcium ATPase isoform 1, which contributes to the maintenance of intracellular calcium homeostasis by removing calcium ions. METHOD Since ATP2B1 knockout mice are reported to be embryo-lethal, we generated systemic heterozygous ATP2B1 null (ATP2B1(+/-)) mice, and evaluated the implication of ATP2B1 in blood pressure. RESULTS ATP2B1(+/-) mice revealed significantly higher SBP as measured by a radiotelemetric method. Phenylephrine-induced vasoconstriction was significantly increased in vascular rings from ATP2B1(+/-) mice, and the difference in this contraction disappeared in the presence of a nitric oxide synthase (NOS) inhibitor. Vasorelaxation to acetylcholine was significantly attenuated in vascular rings from ATP2B1(+/-) mice. In addition, cultured endothelial cells of ATP2B1(+/-) mice showed that the phosphorylation (Ser-1177) level of endothelial NOS protein was significantly lower, and nitric oxide production in endothelial cells and aorta was lower compared with those in control mice. In contrast, neural NOS expression in vascular smooth muscle cells from ATP2B1(+/-) mice and control mice were not significantly different. CONCLUSION These results suggest that decreased ATP2B1 gene expression is associated with impaired endothelial NOS activity and nitric oxide production, and the ATP2B1 gene plays a crucial role in the regulation of blood pressure.
Collapse
|
11
|
Tran QK, VerMeer M, Burgard MA, Hassan AB, Giles J. Hetero-oligomeric Complex between the G Protein-coupled Estrogen Receptor 1 and the Plasma Membrane Ca2+-ATPase 4b. J Biol Chem 2015; 290:13293-307. [PMID: 25847233 DOI: 10.1074/jbc.m114.628743] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Indexed: 11/06/2022] Open
Abstract
The new G protein-coupled estrogen receptor 1 (GPER/GPR30) plays important roles in many organ systems. The plasma membrane Ca(2+)-ATPase (PMCA) is essential for removal of cytoplasmic Ca(2+) and for shaping the time courses of Ca(2+)-dependent activities. Here, we show that PMCA and GPER/GPR30 physically interact and functionally influence each other. In primary endothelial cells, GPER/GPR30 agonist G-1 decreases PMCA-mediated Ca(2+) extrusion by promoting PMCA tyrosine phosphorylation. GPER/GPR30 overexpression decreases PMCA activity, and G-1 further potentiates this effect. GPER/GPR30 knockdown increases PMCA activity, whereas PMCA knockdown substantially reduces GPER/GPR30-mediated phosphorylation of the extracellular signal-related kinase (ERK1/2). GPER/GPR30 co-immunoprecipitates with PMCA with or without treatment with 17β-estradiol, thapsigargin, or G-1. Heterologously expressed GPER/GPR30 in HEK 293 cells co-localizes with PMCA4b, the main endothelial PMCA isoform. Endothelial cells robustly express the PDZ post-synaptic density protein (PSD)-95, whose knockdown reduces the association between GPER/GPR30 and PMCA. Additionally, the association between PMCA4b and GPER/GPR30 is substantially reduced by truncation of either or both of their C-terminal PDZ-binding motifs. Functionally, inhibition of PMCA activity is significantly reduced by truncation of GPER/GPR30's C-terminal PDZ-binding motif. These data strongly indicate that GPER/GPR30 and PMCA4b form a hetero-oligomeric complex in part via the anchoring action of PSD-95, in which they constitutively affect each other's function. Activation of GPER/GPR30 further inhibits PMCA activity through tyrosine phosphorylation of the pump. These interactions represent cross-talk between Ca(2+) signaling and GPER/GPR30-mediated activities.
Collapse
Affiliation(s)
- Quang-Kim Tran
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Mark VerMeer
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Michelle A Burgard
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Ali B Hassan
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Jennifer Giles
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| |
Collapse
|
12
|
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.
Collapse
Affiliation(s)
- Abdul Momen
- Division of Experimental Therapeutics, Toronto General Research Institute , University Health Network, Toronto, Ontario , Canada and
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Inhibition of calpain reduces oxidative stress and attenuates endothelial dysfunction in diabetes. Cardiovasc Diabetol 2014; 13:88. [PMID: 24886224 PMCID: PMC4045988 DOI: 10.1186/1475-2840-13-88] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 04/25/2014] [Indexed: 12/25/2022] Open
Abstract
Aims The present study was to investigate the role of calpain in reactive oxygen species (ROS) production in endothelial cells and endothelium-dependent vascular dysfunction under experimental conditions of diabetes. Methods and results Exposure to high glucose activated calpain, induced apoptosis and reduced nitric oxide (NO) production without changing eNOS protein expression, its phosphorylation and dimers formation in primary human umbilical vein endothelial cells (HUVECs). These effects of high glucose correlated with intracellular ROS production and mitochondrial superoxide generation. Selectively scavenging mitochondrial superoxide increased NO production in high glucose-stimulated HUVECs. Inhibition of calpain using over-expression of calpastatin or pharmacological calpain inhibitor prevented high glucose-induced ROS production, mitochondrial superoxide generation and apoptosis, which were concurrent with an elevation of NO production in HUVECs. In mouse models of streptozotocin-induced type-1 diabetes and OVE26 type-1 diabetic mice, calpain activation correlated with an increase in ROS production and peroxynitrite formation in aortas. Transgenic over-expression of calpastatin reduced ROS production and peroxynitrite formation in diabetic mice. In parallel, diabetes-induced reduction of endothelium-dependent relaxation in aortic ring was reversed by over-expression of calpastatin in mouse models of diabetes. However, the protective effect of calpastatin on endothelium-dependent relaxation was abrogated by eNOS deletion in diabetic mice. Conclusions This study suggests that calpain may play a role in vascular endothelial cell ROS production and endothelium-dependent dysfunction in diabetes. Thus, calpain may be an important therapeutic target to overcome diabetes-induced vascular dysfunction.
Collapse
|
14
|
Kim HJ, Prasad V, Hyung SW, Lee ZH, Lee SW, Bhargava A, Pearce D, Lee Y, Kim HH. Plasma membrane calcium ATPase regulates bone mass by fine-tuning osteoclast differentiation and survival. ACTA ACUST UNITED AC 2013; 199:1145-58. [PMID: 23266958 PMCID: PMC3529522 DOI: 10.1083/jcb.201204067] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Plasma membrane calcium ATPases PMCA1 and PMCA4 regulate osteoclast differentiation and survival by regulating NFATc1 and NO. The precise regulation of Ca2+ dynamics is crucial for proper differentiation and function of osteoclasts. Here we show the involvement of plasma membrane Ca2+ ATPase (PMCA) isoforms 1 and 4 in osteoclastogenesis. In immature/undifferentiated cells, PMCAs inhibited receptor activator of NF-κB ligand–induced Ca2+ oscillations and osteoclast differentiation in vitro. Interestingly, nuclear factor of activated T cell c1 (NFATc1) directly stimulated PMCA transcription, whereas the PMCA-mediated Ca2+ efflux prevented NFATc1 activation, forming a negative regulatory loop. PMCA4 also had an anti-osteoclastogenic effect by reducing NO, which facilitates preosteoclast fusion. In addition to their role in immature cells, increased expression of PMCAs in mature osteoclasts prevented osteoclast apoptosis both in vitro and in vivo. Mice heterozygous for PMCA1 or null for PMCA4 showed an osteopenic phenotype with more osteoclasts on bone surface. Furthermore, PMCA4 expression levels correlated with peak bone mass in premenopausal women. Thus, our results suggest that PMCAs play important roles for the regulation of bone homeostasis in both mice and humans by modulating Ca2+ signaling in osteoclasts.
Collapse
Affiliation(s)
- Hyung Joon Kim
- Department of Cell and Developmental Biology, BK21 Program and Dental Research Institute, Seoul National University, Seoul 110-749, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Strehler EE. Plasma membrane calcium ATPases as novel candidates for therapeutic agent development. JOURNAL OF PHARMACY & PHARMACEUTICAL SCIENCES : A PUBLICATION OF THE CANADIAN SOCIETY FOR PHARMACEUTICAL SCIENCES, SOCIETE CANADIENNE DES SCIENCES PHARMACEUTIQUES 2013; 16:190-206. [PMID: 23958189 PMCID: PMC3869240 DOI: 10.18433/j3z011] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Plasma membrane Ca2+ ATPases (PMCAs) are highly regulated transporters responsible for Ca2+ extrusion from all eukaryotic cells. Different PMCA isoforms are implicated in various tasks of Ca2+ regulation including bulk Ca2+ transport and localized Ca2+ signaling in specific membrane microdomains. Accumulating evidence shows that loss, mutation or inappropriate expression of different PMCAs is associated with pathologies ranging from hypertension, low bone density and male infertility to hearing loss and cerebellar ataxia. Compared to Ca2+ influx channels, PMCAs have lagged far behind as targets for drug development, mainly due to the lack of detailed understanding of their structure and specific function. This is rapidly changing thanks to integrated efforts combining biochemical, structural, cellular and physiological studies suggesting that selective modulation of PMCA isoforms may be of therapeutic value in the management of different and complex diseases. Both structurally informed rational design and high-throughput small molecule library screenings are promising strategies that are expected to lead to specific and isoform-selective modulators of PMCA function. This short review will provide an overview of the diverse roles played by PMCA isoforms in different cells and tissues and their emerging involvement in pathophysiological processes, summarize recent progress in obtaining structural information on the PMCAs, and discuss current and future strategies to develop specific PMCA inhibitors and activators for potential therapeutic applications.
Collapse
Affiliation(s)
- Emanuel E Strehler
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN, USA.
| |
Collapse
|
16
|
Mohamed TMA, Oceandy D, Zi M, Prehar S, Alatwi N, Wang Y, Shaheen MA, Abou-Leisa R, Schelcher C, Hegab Z, Baudoin F, Emerson M, Mamas M, Di Benedetto G, Zaccolo M, Lei M, Cartwright EJ, Neyses L. Plasma membrane calcium pump (PMCA4)-neuronal nitric-oxide synthase complex regulates cardiac contractility through modulation of a compartmentalized cyclic nucleotide microdomain. J Biol Chem 2011; 286:41520-41529. [PMID: 21965681 DOI: 10.1074/jbc.m111.290411] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Identification of the signaling pathways that regulate cyclic nucleotide microdomains is essential to our understanding of cardiac physiology and pathophysiology. Although there is growing evidence that the plasma membrane Ca(2+)/calmodulin-dependent ATPase 4 (PMCA4) is a regulator of neuronal nitric-oxide synthase, the physiological consequence of this regulation is unclear. We therefore tested the hypothesis that PMCA4 has a key structural role in tethering neuronal nitric-oxide synthase to a highly compartmentalized domain in the cardiac cell membrane. This structural role has functional consequences on cAMP and cGMP signaling in a PMCA4-governed microdomain, which ultimately regulates cardiac contractility. In vivo contractility and calcium amplitude were increased in PMCA4 knock-out animals (PMCA4(-/-)) with no change in diastolic relaxation or the rate of calcium decay, showing that PMCA4 has a function distinct from beat-to-beat calcium transport. Surprisingly, in PMCA4(-/-), over 36% of membrane-associated neuronal nitric-oxide synthase (nNOS) protein and activity was delocalized to the cytosol with no change in total nNOS protein, resulting in a significant decrease in microdomain cGMP, which in turn led to a significant elevation in local cAMP levels through a decrease in PDE2 activity (measured by FRET-based sensors). This resulted in increased L-type calcium channel activity and ryanodine receptor phosphorylation and hence increased contractility. In the heart, in addition to subsarcolemmal calcium transport, PMCA4 acts as a structural molecule that maintains the spatial and functional integrity of the nNOS signaling complex in a defined microdomain. This has profound consequences for the regulation of local cyclic nucleotide and hence cardiac β-adrenergic signaling.
Collapse
Affiliation(s)
- Tamer M A Mohamed
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom; Biochemistry Department, Faculty of Pharmacy, Zagazig University, 44519 Zagazig, Egypt
| | - Delvac Oceandy
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Min Zi
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Sukhpal Prehar
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Nasser Alatwi
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Yanwen Wang
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Mohamed A Shaheen
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Riham Abou-Leisa
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Celine Schelcher
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Zeinab Hegab
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Florence Baudoin
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Michael Emerson
- Platelet Biology Group, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, United Kingdom
| | - Mamas Mamas
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | | | - Manuela Zaccolo
- Institute of Neuroscience and Psychology, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - Ming Lei
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Elizabeth J Cartwright
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Ludwig Neyses
- Cardiovascular Medicine Research Group, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9PT, United Kingdom.
| |
Collapse
|
17
|
Cartwright EJ, Oceandy D, Austin C, Neyses L. Ca2+ signalling in cardiovascular disease: the role of the plasma membrane calcium pumps. SCIENCE CHINA-LIFE SCIENCES 2011; 54:691-8. [DOI: 10.1007/s11427-011-4199-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 06/10/2011] [Indexed: 12/25/2022]
|
18
|
Pande J, Szewczyk MM, Grover AK. Allosteric inhibitors of plasma membrane Ca 2+ pumps: Invention and applications of caloxins. World J Biol Chem 2011; 2:39-47. [PMID: 21537489 PMCID: PMC3083994 DOI: 10.4331/wjbc.v2.i3.39] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 11/18/2010] [Accepted: 11/25/2010] [Indexed: 02/05/2023] Open
Abstract
Plasma membrane Ca2+ pumps (PMCA) play a major role in Ca2+ homeostasis and signaling by extruding cellular Ca2+ with high affinity. PMCA isoforms are encoded by four genes which are expressed differentially in various cell types in normal and disease states. Therefore, PMCA isoform selective inhibitors would aid in delineating their role in physiology and pathophysiology. We are testing the hypothesis that extracellular domains of PMCA can be used as allosteric targets to obtain a novel class of PMCA-specific inhibitors termed caloxins. This review presents the concepts behind the invention of caloxins and our progress in this area. A section is also devoted to the applications of caloxins in literature. We anticipate that isoform-selective caloxins will aid in understanding PMCA physiology in health and disease. With strategies to develop therapeutics from bioactive peptides, caloxins may become clinically useful in cardiovascular diseases, neurological disorders, retinopathy, cancer and contraception.
Collapse
Affiliation(s)
- Jyoti Pande
- Jyoti Pande, Ashok K Grover, Department of Medicine, HSC 4N41, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada
| | | | | |
Collapse
|
19
|
Brini M, Carafoli E. The plasma membrane Ca²+ ATPase and the plasma membrane sodium calcium exchanger cooperate in the regulation of cell calcium. Cold Spring Harb Perspect Biol 2011; 3:cshperspect.a004168. [PMID: 21421919 DOI: 10.1101/cshperspect.a004168] [Citation(s) in RCA: 192] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Calcium is an ambivalent signal: it is essential for the correct functioning of cell life, but may also become dangerous to it. The plasma membrane Ca(2+) ATPase (PMCA) and the plasma membrane Na(+)/Ca(2+) exchanger (NCX) are the two mechanisms responsible for Ca(2+) extrusion. The NCX has low Ca(2+) affinity but high capacity for Ca(2+) transport, whereas the PMCA has a high Ca(2+) affinity but low transport capacity for it. Thus, traditionally, the PMCA pump has been attributed a housekeeping role in maintaining cytosolic Ca(2+), and the NCX the dynamic role of counteracting large cytosolic Ca(2+) variations (especially in excitable cells). This view of the roles of the two Ca(2+) extrusion systems has been recently revised, as the specific functional properties of the numerous PMCA isoforms and splicing variants suggests that they may have evolved to cover both the basal Ca(2+) regulation (in the 100 nM range) and the Ca(2+) transients generated by cell stimulation (in the μM range).
Collapse
Affiliation(s)
- Marisa Brini
- Department of Biological Chemistry, University of Padova, Viale G. Colombo 3, 35131 Padova, Italy.
| | | |
Collapse
|
20
|
Decher N, Wemhöner K, Rinné S, Netter MF, Zuzarte M, Aller MI, Kaufmann SG, Li XT, Meuth SG, Daut J, Sachse FB, Maier SK. Knock-Out of the Potassium Channel TASK-1 Leads to a Prolonged QT Interval and a Disturbed QRS Complex. Cell Physiol Biochem 2011; 28:77-86. [DOI: 10.1159/000331715] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/07/2011] [Indexed: 01/13/2023] Open
|
21
|
Jones S, Solomon A, Sanz-Rosa D, Moore C, Holbrook L, Cartwright EJ, Neyses L, Emerson M. The plasma membrane calcium ATPase modulates calcium homeostasis, intracellular signaling events and function in platelets. J Thromb Haemost 2010; 8:2766-74. [PMID: 20880258 DOI: 10.1111/j.1538-7836.2010.04076.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND The plasma membrane calcium ATPase (PMCA) regulates localized signaling events in a variety of cell types, although its functional role in platelets remains undefined. OBJECTIVES To investigate the role of PMCA in determining platelet intracellular calcium concentration ([Ca²(+) ](i) ) at rest and following agonist stimulation, and to define the corresponding effects upon different stages of platelet activation. METHODS [Ca²(+) ](i) was continuously measured in Fura-2-loaded platelets and in vitro and in vivo functional analyses performed in the presence of the PMCA inhibitor carboxyeosin (CE). RESULTS Concentrations of CE that selectively inhibited Ca²(+) extrusion through PMCA were established in human platelets. [Ca²(+) ](i) was elevated by CE in resting platelets, although collagen-stimulated Ca²(+) release was reduced. Impaired Ca²(+) mobilization upon agonist stimulation was accompanied by reduced dense granule secretion and impaired platelet aggregation. Platelet aggregation responses were also reduced in PMCA4(-/-) mice and in an in vivo mouse model of platelet thromboembolism. Conversely, inhibition of PMCA promoted the early and later stages of platelet activation, observed as enhanced adhesion to fibrinogen, and accelerated clot retraction. Investigations into the signaling mechanisms underlying CE-mediated inhibition of platelet aggregation implicated cGMP-independent vasodilator-stimulated phosphoprotein phosphorylation. CONCLUSIONS Disruption of PMCA activity perturbs platelet Ca²(+) homeostasis and function in a time-dependent manner, demonstrating that PMCA differentially regulates Ca²(+) -dependent signaling events, and hence function, throughout the platelet activation process.
Collapse
Affiliation(s)
- S Jones
- Platelet Biology Group, Molecular Medicine Section, National Heart and Lung Institute, Imperial College London, London, UK
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Cartwright EJ, Neyses L. Evaluation of plasma membrane calcium/calmodulin-dependent ATPase isoform 4 as a potential target for fertility control. Handb Exp Pharmacol 2010:79-95. [PMID: 20839088 DOI: 10.1007/978-3-642-02062-9_6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The array of contraceptives currently available is clearly inadequate and does not meet consumer demands since it is estimated that up to a quarter of all pregnancies worldwide are unintended. There is, therefore, an overwhelming global need to develop new effective, safe, ideally non-hormonal contraceptives for both male and female use. The contraceptive field, unlike other areas such as cancer, has a dearth of new targets. We have addressed this issue and propose that isoform 4 of the plasma membrane calcium ATPase is a potentially exciting novel target for fertility control. The plasma membrane calcium ATPase is a ubiquitously expressed calcium pump whose primary function in the majority of cells is to extrude calcium to the extracellular milieu. Two isoforms of this gene family, PMCA1 and PMCA4, are expressed in spermatozoa, with PMCA4 being the predominant isoform. Although this gene is ubiquitously expressed, its function is highly tissue-specific. Genetic deletion of PMCA4, in PMCA4 knockout mice, led to 100% infertility specifically in the male mutant mice due to a selective defect in sperm motility. It is important to note that the gene deletion did not affect normal mating characteristics in these mice. This phenotype was mimicked in wild-type sperm treated with the non-specific PMCA inhibitor 5-(and 6-) carboxyeosin diacetate succinimidyl ester; a proof-of-principle that inhibition of PMCA4 has potential importance in the control of fertility. This review outlines the potential for PMCA4 to be a novel target for fertility control by acting to inhibit sperm motility. It will outline the characteristics that make this target drugable and will describe methodologies to identify and validate novel inhibitors of this target.
Collapse
Affiliation(s)
- Elizabeth J Cartwright
- Cardiovascular Medicine, University of Manchester, Room 1.302 Stopford Building, Oxford Road, Manchester, UK.
| | | |
Collapse
|
23
|
Szewczyk MM, Pande J, Akolkar G, Grover AK. Caloxin 1b3: a novel plasma membrane Ca(2+)-pump isoform 1 selective inhibitor that increases cytosolic Ca(2+) in endothelial cells. Cell Calcium 2010; 48:352-7. [PMID: 21093050 DOI: 10.1016/j.ceca.2010.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 10/19/2010] [Accepted: 10/21/2010] [Indexed: 02/06/2023]
Abstract
The purpose of this study was to invent an extracellular inhibitor selective for the plasma membrane Ca(2+) pump(s) (PMCA) isoform 1. PMCA extrude Ca(2+) from cells during signalling and homeostasis. PMCA isoforms are encoded by 4 genes (PMCA1-4). Pig coronary artery endothelium and smooth muscle express the genes PMCA1 and 4. We showed that the endothelial cells contained mostly PMCA1 protein while smooth muscle cells had mostly PMCA4. A random peptide phage display library was screened for binding to synthetic extracellular domain 1 of PMCA1. The selected phage population was screened further by affinity chromatography using PMCA from rabbit duodenal mucosa which expressed mostly PMCA1. The peptide displayed by the selected phage was termed caloxin 1b3. Caloxin 1b3 inhibited PMCA Ca(2+)-Mg(2+)-ATPase in the rabbit duodenal mucosa (PMCA1) with a greater affinity (inhibition constant=17±2 μM) than the PMCA in the human erythrocyte ghosts (PMCA4, inhibition constant=45±4 μM). The affinity of caloxin 1b3 was also higher for PMCA1 than for PMCA2 and 3 indicating its selectivity for PMCA1. Consistent with an inhibition of PMCA1, caloxin 1b3 addition to the medium increased cytosolic Ca(2+) concentration in endothelial cells. Caloxin 1b3 is the first known PMCA1 selective inhibitor. We anticipate caloxin 1b3 to aid in understanding PMCA physiology in endothelium and other tissues.
Collapse
Affiliation(s)
- Magdalena M Szewczyk
- Department of Biology, HSC 4N41 McMaster University, 1200 Main Street West Hamilton, Ontario, Canada L8N 3Z5
| | | | | | | |
Collapse
|
24
|
Holton ML, Wang W, Emerson M, Neyses L, Armesilla AL. Plasma membrane calcium ATPase proteins as novel regulators of signal transduction pathways. World J Biol Chem 2010; 1:201-8. [PMID: 21537369 PMCID: PMC3083965 DOI: 10.4331/wjbc.v1.i6.201] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 06/22/2010] [Accepted: 06/24/2010] [Indexed: 02/05/2023] Open
Abstract
Emerging evidence suggests that plasma membrane calcium ATPases (PMCAs) play a key role as regulators of calcium-triggered signal transduction pathways via interaction with partner proteins. PMCAs regulate these pathways by targeting specific proteins to cellular sub-domains where the levels of intracellular free calcium are kept low by the calcium ejection properties of PMCAs. According to this model, PMCAs have been shown to interact functionally with the calcium-sensitive proteins neuronal nitric oxide synthase, calmodulin-dependent serine protein kinase, calcineurin and endothelial nitric oxidase synthase. Transgenic animals with altered expression of PMCAs are being used to evaluate the physiological significance of these interactions. To date, PMCA interactions with calcium-dependent partner proteins have been demonstrated to play a crucial role in the pathophysiology of the cardiovascular system via regulation of the nitric oxide and calcineurin/nuclear factor of activated T cells pathways. This new evidence suggests that PMCAs play a more sophisticated role than the mere ejection of calcium from the cells, by acting as modulators of signaling transduction pathways.
Collapse
Affiliation(s)
- Mary Louisa Holton
- Mary Louisa Holton, Angel L Armesilla, Molecular Pharmacology Group, Department of Pharmacy, Research Institute in Healthcare Sciences, Room MA 228, School of Applied sciences, University of Wolverhampton, WV1 1SB, Wolverhampton, United Kingdom
| | | | | | | | | |
Collapse
|
25
|
Guibert C. Plasma membrane Ca2+-ATPase equals no NO. Cardiovasc Res 2010; 87:401-2. [PMID: 20542879 DOI: 10.1093/cvr/cvq187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
26
|
Holton M, Mohamed TMA, Oceandy D, Wang W, Lamas S, Emerson M, Neyses L, Armesilla AL. Endothelial nitric oxide synthase activity is inhibited by the plasma membrane calcium ATPase in human endothelial cells. Cardiovasc Res 2010; 87:440-8. [PMID: 20211863 DOI: 10.1093/cvr/cvq077] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Nitric oxide (NO) plays a pivotal role in the regulation of cardiovascular physiology. Endothelial NO is mainly produced by the endothelial nitric oxide synthase (eNOS) enzyme. eNOS enzymatic activity is regulated at several levels, including Ca(2+)/calmodulin binding and the interaction of eNOS with associated proteins. There is emerging evidence indicating a role for the plasma membrane calcium ATPase (PMCA) as a negative regulator of Ca(2+)/calmodulin-dependent signal transduction pathways via its interaction with partner proteins. The aim of our study was to investigate the possibility that the activity of eNOS is regulated through its association with endothelial PMCA. METHODS AND RESULTS We show here a novel interaction between endogenous eNOS and PMCA in human primary endothelial cells. The interaction domains were located to the region 735-934 of eNOS and the catalytic domain of PMCA. Ectopic expression of PMCA in endothelial cells resulted in an increase in phosphorylation of the residue Thr-495 of endogenous eNOS. However, disruption of the PMCA-eNOS interaction by expression of the PMCA interaction domain significantly reversed the PMCA-mediated effect on eNOS phosphorylation. These results suggest that eNOS activity is negatively regulated via interaction with PMCA. Moreover, NO production by endothelial cells was significantly reduced by ectopic expression of PMCA. CONCLUSION Our results show strong evidence for a novel functional interaction between endogenous PMCA and eNOS in endothelial cells, suggesting a role for endothelial PMCA as a negative modulator of eNOS activity, and, therefore, NO-dependent signal transduction pathways.
Collapse
Affiliation(s)
- MaryLouisa Holton
- Molecular Pharmacology Group, Department of Pharmacy, Research Institute in Healthcare Sciences, School of Applied Sciences, University of Wolverhampton, Wulfruna Street, Wolverhampton WV1 1SB, UK
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Abstract
Ca2+-ATPases (pumps) are key actors in the regulation of Ca2+ in eukaryotic cells and are thus essential to the correct functioning of the cell machinery. They have high affinity for Ca2+ and can efficiently regulate it down to very low concentration levels. Two of the pumps have been known for decades (the SERCA and PMCA pumps); one (the SPCA pump) has only become known recently. Each pump is the product of a multigene family, the number of isoforms being further increased by alternative splicing of the primary transcripts. The three pumps share the basic features of the catalytic mechanism but differ in a number of properties related to tissue distribution, regulation, and role in the cellular homeostasis of Ca2+. The molecular understanding of the function of the pumps has received great impetus from the solution of the three-dimensional structure of one of them, the SERCA pump. These spectacular advances in the structure and molecular mechanism of the pumps have been accompanied by the emergence and rapid expansion of the topic of pump malfunction, which has paralleled the rapid expansion of knowledge in the topic of Ca2+-signaling dysfunction. Most of the pump defects described so far are genetic: when they are very severe, they produce gross and global disturbances of Ca2+ homeostasis that are incompatible with cell life. However, pump defects may also be of a type that produce subtler, often tissue-specific disturbances that affect individual components of the Ca2+-controlling and/or processing machinery. They do not bring cells to immediate death but seriously compromise their normal functioning.
Collapse
|
28
|
Calcium-Dependent and Endothelium-Dependent Mechanisms for a Constrictor Response of the Saphenous Vein. Bull Exp Biol Med 2009; 147:170-2. [DOI: 10.1007/s10517-009-0469-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
29
|
Pande J, Szewczyk MM, Kuszczak I, Grover S, Escher E, Grover AK. Functional effects of caloxin 1c2, a novel engineered selective inhibitor of plasma membrane Ca(2+)-pump isoform 4, on coronary artery. J Cell Mol Med 2008; 12:1049-60. [PMID: 18494944 PMCID: PMC4401146 DOI: 10.1111/j.1582-4934.2008.00140.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Coronary artery smooth muscle expresses the plasma membrane Ca2+ pump (PMCA) isoforms PMCA4 and PMCA1. We previously reported the peptide inhibitor caloxin 1b1 that was obtained by using extracellular domain 1 of PMCA4 as the target (Am J Physiol Cell.290 [2006] C1341). To engineer inhibitors with greater affinity and isoform selectivity, we have now created a phage display library of caloxin 1b1-like peptides. We screened this library by affinity chromatography with PMCA from erythrocyte ghosts that contain mainly PMCA4 to obtain caloxin 1c2. Key properties of caloxin 1c2 are (a) Ki = 2.3 ± 0.3 μM which corresponds to a 20× higher affinity for PMCA4 than that of caloxin 1b1 and (b) it is selective for PMCA4 since it has greater than 10-fold affinity for PMCA4 than for PMCA1, 2 or 3. It had the following functional effects on coronary artery smooth muscle: (a) it increased basal tone of the de-endothelialized arteries; the increase being similar at 10, 20 or 50 μM, and (b) it enhanced the increase in the force of contraction at 0.05 but not at 1.6 mM extracellular Ca2+ when Ca2+ extrusion via the Na+–Ca2+ exchanger and the sarco/endoplasmic reticulum Ca2+ pump were inhibited. We conclude that PMCA4 is pivotal to Ca2+ extrusion in coronary artery smooth muscle. We anticipate caloxin 1c2 to aid in understanding the role of PMCA4 in signal transduction and home-ostasis due to its isoform selectivity and ability to act when added extracellularly.
Collapse
Affiliation(s)
- Jyoti Pande
- Department of Biology, McMaster University, Hamilton, ON, Canada
| | | | | | | | | | | |
Collapse
|
30
|
Diesen DL, Hess DT, Stamler JS. Hypoxic vasodilation by red blood cells: evidence for an s-nitrosothiol-based signal. Circ Res 2008; 103:545-53. [PMID: 18658051 DOI: 10.1161/circresaha.108.176867] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Red blood cells (RBCs) have been ascribed an essential role in matching blood flow to local metabolic demand during hypoxic vasodilation. The vasodilatory function of RBCs evidently relies on the allosteric properties of hemoglobin (Hb), which couple the conformation of Hb to tissue oxygen tension (Po(2)) and thereby provide a basis for the graded vasodilatory activity that is inversely proportional to Hb oxygen saturation. Although a large body of evidence indicates that the Po(2)-coupled allosteric transition from R (oxy)-state to T (deoxy)-state subserves the release from Hb of vasodilatory nitric oxide (NO) bioactivity, it has not yet been determined whether the NO-based signal is a necessary and sufficient source of RBC-mediated vasoactivity and it has been suggested that ATP or nitrite may also contribute. We demonstrate here by bioassay that untreated human RBCs rapidly and substantially relax thoracic aorta from both rabbit and mouse at low Po(2) (approximately 1% O(2)) but not at high Po(2) (approximately 21% O(2)). RBC-mediated vasorelaxation is inhibited by prior depletion of S-nitroso-Hb, potentiated by low-molecular-weight thiols, and dependent on cGMP. Furthermore, these relaxations are largely endothelium-independent and unaffected by NO synthase inhibition or nitrite. Robust relaxations by RBCs are also elicited in the absence of endothelial, neuronal or inducible NO synthase. Finally, contractions that appear following resolution of RBC-mediated relaxations are dependent on NO derived from RBCs as well as the endothelium. Our results suggest that an S-nitrosothiol-based signal originating from RBCs mediates hypoxic vasodilation by RBCs, and that vasorelaxation by RBCs dominates NO-based vasoconstriction under hypoxic conditions.
Collapse
Affiliation(s)
- Diana L Diesen
- Departments of Surgery, Duke University Medical Center, Durham, NC 27710, USA
| | | | | |
Collapse
|
31
|
Oloizia B, Paul RJ. Ca2+ clearance and contractility in vascular smooth muscle: evidence from gene-altered murine models. J Mol Cell Cardiol 2008; 45:347-62. [PMID: 18598701 DOI: 10.1016/j.yjmcc.2008.05.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 05/17/2008] [Accepted: 05/29/2008] [Indexed: 01/15/2023]
Abstract
The central importance of calcium clearance proteins, and their regulators, in the modulation of myocardial contractility and intracellular Ca(2+) concentration ([Ca(2+)](i)) has long been established. Key players identified include the Na(+)-Ca(2+) exchanger, the Na(+)-K(+) ATPase, the sarco(endo)plasmic reticulum Ca(2+)-ATPase and associated phospholamban. Gene-targeted and transgenic murine models have been critical in the elucidation of their function. The study of these proteins in the regulation of contractile parameters in vascular smooth muscle, on the other hand, is less well studied. More recently, gene-targeted and transgenic models have expanded our knowledge of Ca(2+) clearance proteins and their role in both tonic and phasic smooth muscle contractility. In this review, we will briefly treat the mechanisms which underlie Ca(2+) clearance in smooth muscle. These will be addressed in light of studies using gene-modified mouse models, the results of which will be compared and contrasted with those in the cardiomyocyte. The recently identified human mutations in phospholamban, which lead to dilated cardiomyopathy, are also present in vascular and other smooth muscle. Given the importance of these Ca(2+) clearance systems to modulation of smooth muscle, it is likely that mutations will also lead to smooth muscle pathology.
Collapse
Affiliation(s)
- Brian Oloizia
- Department of Molecular and Cellular Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0576, USA
| | | |
Collapse
|
32
|
El-Yazbi AF, Cho WJ, Cena J, Schulz R, Daniel EE. Smooth muscle NOS, colocalized with caveolin-1, modulates contraction in mouse small intestine. J Cell Mol Med 2008; 12:1404-15. [PMID: 18400048 PMCID: PMC3865682 DOI: 10.1111/j.1582-4934.2008.00335.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Neuronal nitric oxide synthase (nNOS) in myenteric neurons is activated during peristalsis to produce nitric oxide which relaxes intestinal smooth muscle. A putative nNOS is also found in the membrane of intestinal smooth muscle cells in mouse and dog. In this study we studied the possible functions of this nNOS expressed in mouse small intestinal smooth muscle colocalized with caveolin-1(Cav-1). Cav-1 knockout mice lacked nNOS in smooth muscle and provided control tissues. 60 mM KCl was used to increase intracellular [Ca2+] through L-type Ca2+ channel opening and stimulate smooth muscle NOS activity in intestinal tissue segments. An additional contractile response to LNNA (100 μM, NOS inhibitor) was observed in KCl-contracted tissues from control mice and was almost absent in tissues from Cav-1 knockout mice. Disruption of caveolae with 40 mM methyl-β cyclodextrin in tissues from control mice led to the loss of Cav-1 and nNOS immunoreactivity from smooth muscle as shown by immunohistochemistry and a reduction in the response of these tissues to N-ω-nitro-L-arginine (LNNA). Reconstitution of membrane cholesterol using water soluble cholesterol in the depleted segments restored the immunoreactivity and the response to LNNA added after KCl. Nicardipine (1 μM) blocked the responses to KCl and LNNA confirming the role of L-type Ca2+ channels. ODQ (1 μM, soluble guanylate cyclase inhibitor) had the same effect as inhibition of NOS following KCl. We conclude that the activation of nNOS, localized in smooth muscle caveolae, by calcium entering through L-type calcium channels triggers nitric oxide production which modulates muscle contraction by a cGMP-dependent mechanism.
Collapse
Affiliation(s)
- Ahmed F El-Yazbi
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada
| | | | | | | | | |
Collapse
|
33
|
Sathish V, Leblebici F, Kip SN, Thompson MA, Pabelick CM, Prakash YS, Sieck GC. Regulation of sarcoplasmic reticulum Ca2+ reuptake in porcine airway smooth muscle. Am J Physiol Lung Cell Mol Physiol 2008; 294:L787-96. [PMID: 18245264 DOI: 10.1152/ajplung.00461.2007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Regulation of intracellular Ca(2+) concentration ([Ca(2+)](i)) in airway smooth muscle (ASM) during agonist stimulation involves sarcoplasmic reticulum (SR) Ca(2+) release and reuptake. The sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA) is key to replenishment of SR Ca(2+) stores. We examined regulation of SERCA in porcine ASM: our hypothesis was that the regulatory protein phospholamban (PLN) and the calmodulin (CaM)-CaM kinase (CaMKII) pathway (both of which are known to regulate SERCA in cardiac muscle) play a role. In porcine ASM microsomes, we examined the expression and extent of PLN phosphorylation after pharmacological inhibition of CaM (with W-7) vs. CaMKII (with KN-62/KN-93) and found that PLN is phosphorylated by CaMKII. In parallel experiments using enzymatically dissociated single ASM cells loaded with the Ca(2+) indicator fluo 3 and imaged using fluorescence microscopy, we measured the effects of PLN small interfering RNA, W-7, and KN-62 on [Ca(2+)](i) responses to ACh and direct SR stimulation. PLN small interfering RNA slowed the rate of fall of [Ca(2+)](i) transients to 1 microM ACh, as did W-7 and KN-62. The two inhibitors additionally slowed reuptake in the absence of PLN. In other cells, preexposure to W-7 or KN-62 did not prevent initiation of ACh-induced [Ca(2+)](i) oscillations (which were previously shown to result from repetitive SR Ca(2+) release/reuptake). However, when ACh-induced [Ca(2+)](i) oscillations reached steady state, subsequent exposure to W7 or KN-62 decreased oscillation frequency and amplitude and slowed the fall time of [Ca(2+)](i) transients, suggesting SERCA inhibition. Exposure to W-7 completely abolished ongoing ACh-induced [Ca(2+)](i) oscillations in some cells. Preexposure to W-7 or KN-62 did not affect caffeine-induced SR Ca(2+) release, indicating that ryanodine receptor channels were not directly inhibited. These data indicate that, in porcine ASM, the CaM-CaMKII pathway regulates SR Ca(2+) reuptake, potentially through altered PLN phosphorylation.
Collapse
Affiliation(s)
- Venkatachalem Sathish
- Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | | | | | | | | | | | | |
Collapse
|
34
|
Physiological implications of the interaction between the plasma membrane calcium pump and nNOS. Pflugers Arch 2008; 457:665-71. [DOI: 10.1007/s00424-008-0455-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2007] [Revised: 01/07/2008] [Accepted: 01/14/2008] [Indexed: 10/24/2022]
|
35
|
The regulatory function of plasma-membrane Ca2+-ATPase (PMCA) in the heart. Biochem Soc Trans 2007; 35:927-30. [DOI: 10.1042/bst0350927] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The PMCA (plasma-membrane Ca2+-ATPase) is a ubiquitously expressed calcium-extruding enzymatic pump important in the control of intracellular calcium concentration. Unlike in non-excitable cells, where PMCA is the only system for calcium extrusion, in excitable cells, such as cardiomyocytes, PMCA has been shown to play only a minor role in calcium homoeostasis compared with the NCX (sodium/calcium exchanger), another system of calcium extrusion. However, increasing evidence points to an important role for PMCA in signal transduction; of particular interest in cardiac physiology is the modulation of nNOS (neuronal nitric oxide synthase) by isoform 4b of PMCA. In the present paper, we will discuss recent advances that support a key role for PMCA4 in modulating the nitric oxide signalling pathway in the heart.
Collapse
|
36
|
Szewczyk MM, Pande J, Grover AK. Caloxins: a novel class of selective plasma membrane Ca2+ pump inhibitors obtained using biotechnology. Pflugers Arch 2007; 456:255-66. [PMID: 17909851 DOI: 10.1007/s00424-007-0348-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Accepted: 09/06/2007] [Indexed: 12/22/2022]
Abstract
Plasma membrane Ca2+ pumps (PMCA) extrude cellular Ca2+ with a high affinity and hence play a major role in Ca2+ homeostasis and signaling. Caloxins (selective extracellular PMCA inhibitors) would aid in elucidating the physiology of PMCA. PMCA proteins have five extracellular domains (exdoms). Our hypotheses are: 1) peptides that bind selectively to each exdom can be invented by screening a random peptide library, and 2) a peptide can modulate PMCA activity by binding to one of the exdoms. The first caloxin 2a1, selected for binding exdom 2 was selective for PMCA (Ki=529 microM). It has been used to examine the physiological role of PMCA. PMCA isoforms are encoded by four genes. PMCA isoform expression differs in various cell types, with PMCA1 and 4 being the most widely distributed. There are differences between PMCA1-4 exdom 1 sequences, which may be exploited for inventing isoform selective caloxins. Using exdom 1 of PMCA4 as a target, modified screening procedures and mutagenesis led to the high-affinity caloxin 1c2 (Ki=2.3 microM for PMCA4). It is selective for PMCA4 over PMCA1, 2, or 3. We hope that caloxins can be used to discern the roles of individual PMCA isoforms in Ca2+ homeostasis and signaling. Caloxins may also become clinically useful in cardiovascular diseases, neurological disorders, retinopathy, cancer, and contraception.
Collapse
Affiliation(s)
- Magdalena M Szewczyk
- Department of Biology, McMaster University, HSC 4N41, 1200 Main Street W, Hamilton, ON L8N3Z5, Canada
| | | | | |
Collapse
|
37
|
Cartwright EJ, Oceandy D, Neyses L. Plasma membrane calcium ATPase and its relationship to nitric oxide signaling in the heart. Ann N Y Acad Sci 2007; 1099:247-53. [PMID: 17446465 DOI: 10.1196/annals.1387.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The plasma membrane calcium/calmodulin-dependent ATPase (PMCA) is a ubiquitously expressed calcium-extruding enzymatic pump. In the majority of cells the main function of PMCA is as the only system to extrude calcium from the cytosol, however, in the excitable cells of the heart it has only a minor role in the bulk removal of calcium compared to the sodium-calcium exchanger. There is increasing evidence to suggest that PMCA has an additional role as a potential modulator of a number of signal transduction pathways. Of key interest in the heart is the functional interaction between the calcium/calmodulin-dependent enzyme neuronal nitric oxide synthase (nNOS) and isoform 4 of PMCA. Nitric oxide production from nNOS is known to be important in the regulation of excitation-contraction (EC) coupling and subsequently contractility. This article will focus on recent evidence suggesting that PMCA4 has a regulatory role in the nitric oxide signaling pathway in the heart.
Collapse
Affiliation(s)
- Elizabeth J Cartwright
- Division of Cardiovascular and Endocrine Sciences, University of Manchester, Oxford Road, Manchester, UK, M13 9PT
| | | | | |
Collapse
|
38
|
Oceandy D, Cartwright EJ, Emerson M, Prehar S, Baudoin FM, Zi M, Alatwi N, Venetucci L, Schuh K, Williams JC, Armesilla AL, Neyses L. Neuronal Nitric Oxide Synthase Signaling in the Heart Is Regulated by the Sarcolemmal Calcium Pump 4b. Circulation 2007; 115:483-92. [PMID: 17242280 DOI: 10.1161/circulationaha.106.643791] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
Neuronal nitric oxide synthase (nNOS) has recently been shown to be a major regulator of cardiac contractility. In a cellular system, we have previously shown that nNOS is regulated by the isoform 4b of plasma membrane calcium/calmodulin-dependent ATPase (PMCA4b) through direct interaction mediated by a PDZ domain (PSD 95, Drosophilia Discs large protein and Zona occludens-1) on nNOS and a cognate ligand on PMCA4b. It remains unknown, however, whether this interaction has physiological relevance in the heart in vivo.
Methods and Results—
We generated 2 strains of transgenic mice overexpressing either human PMCA4b or PMCA ct120 in the heart. PMCA ct120 is a highly active mutant form of the pump that does not interact with or modulate nNOS function. Calcium was extruded normally from PMCA4b-overexpressing cardiomyocytes, but in vivo, overexpression of PMCA4b reduced the β-adrenergic contractile response. This attenuated response was not observed in ct120 transgenic mice. Treatment with a specific nNOS inhibitor (
N
ω-propyl-
l
-arginine) reduced the β-adrenergic response in wild-type and ct120 transgenic mice to levels comparable to those of PMCA4b transgenic animals. No differences in lusitropic response were observed in either transgenic strain compared with wild-type littermates.
Conclusions—
These data demonstrate the physiological relevance of the interaction between PMCA4b and nNOS and suggests its signaling role in the heart.
Collapse
Affiliation(s)
- Delvac Oceandy
- Division of Cardiovascular and Endocrine Sciences, University of Manchester, Oxford Rd, Manchester M13 9PT, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Williams JC, Armesilla AL, Mohamed TMA, Hagarty CL, McIntyre FH, Schomburg S, Zaki AO, Oceandy D, Cartwright EJ, Buch MH, Emerson M, Neyses L. The sarcolemmal calcium pump, alpha-1 syntrophin, and neuronal nitric-oxide synthase are parts of a macromolecular protein complex. J Biol Chem 2006; 281:23341-8. [PMID: 16735509 DOI: 10.1074/jbc.m513341200] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The main role of the plasma membrane Ca2+/calmodulin-dependent ATPase (PMCA) is in the removal of Ca2+ from the cytosol. Recently, we and others have suggested a new function for PMCA as a modulator of signal transduction pathways. This paper shows the physical interaction between PMCA (isoforms 1 and 4) and alpha-1 syntrophin and proposes a ternary complex of interaction between endogenous PMCA, alpha-1 syntrophin, and NOS-1 in cardiac cells. We have identified that the linker region between the pleckstrin homology 2 (PH2) and the syntrophin unique (SU) domains, corresponding to amino acids 399-447 of alpha-1 syntrophin, is crucial for interaction with PMCA1 and -4. The PH2 and the SU domains alone failed to interact with PMCA. The functionality of the interaction was demonstrated by investigating the inhibition of neuronal nitric-oxide synthase-1 (NOS-1); PMCA is a negative regulator of NOS-1-dependent NO production, and overexpression of alpha-1 syntrophin and PMCA4 resulted in strongly increased inhibition of NO production. Analysis of the expression levels of alpha-1 syntrophin protein in the heart, skeletal muscle, brain, uterus, kidney, or liver of PMCA4-/- mice, did not reveal any differences when compared with those found in the same tissues of wild-type mice. These results suggest that PMCA4 is tethered to the syntrophin complex as a regulator of NOS-1, but its absence does not cause collapse of the complex, contrary to what has been reported for other proteins within the complex, such as dystrophin. In conclusion, the present data demonstrate for the first time the localization of PMCA1b and -4b to the syntrophin.dystrophin complex in the heart and provide a specific molecular mechanism of interaction as well as functionality.
Collapse
Affiliation(s)
- Judith C Williams
- Division of Cardiology, Room 1.302 Stopford Building, The University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Withers S, Cartwright EJ, Neyses L. Sperm phenotype of mice carrying a gene deletion for the plasma membrane calcium/calmodulin dependent ATPase 4. Mol Cell Endocrinol 2006; 250:93-7. [PMID: 16442703 DOI: 10.1016/j.mce.2005.12.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The sarcolemmal calcium pumps (PMCA for plasma membrane calcium/calmodulin dependent ATPase) are a family of 10 transmembrane domain proteins ejecting calcium from the cytosol. They are encoded by four independent genes and at least 21 splice variants have been described. Isoforms 1 and 4 are ubiquitous, whereas isoforms 2 and 3 are confined to neurons and few other cells (e.g. isoform 2 in the myocardium). In non-excitable cells they are thought to be the only calcium ejection systems and their function as governors of calcium balance is hence intuitive since cells cannot survive in a state of calcium overload. Differences in the affinity of the various isoforms for calcium, ATP and calmodulin have been described, but it is unclear whether the pumps have specialized functions over and above their 'housekeeping' role. In particular, in excitable cells, most calcium is ejected by the sodium/calcium exchanger suggesting that the PMCAs may have evolved into a specialized role. Recently, our group has identified a number of specialized functions of the PMCAs, notably a prominent regulatory role of PMCA4 (splice variant b) for neuronal NO synthase as well as for the Ras pathway. In addition, mice carrying a genetic deletion of the PMCA4 gene showed normal female, but completely infertile male animals. This is due to a highly specific defect in sperm motility, which is reduced to zero, with normal fertilization capacity. Overall, a scenario emerges where the plasma membrane calcium pumps fulfil roles far beyond the traditional housekeeping function, notably in cell signaling, sperm motility, and potentially in cell division. Consequently, we are currently exploring their potential as future drug targets for a variety of conditions, as well as their potential use in the development of a male contraception.
Collapse
Affiliation(s)
- Sarah Withers
- Division of Cardiology, University of Manchester, Room 1.302 Stopford Building, Oxford Road, Manchester M13 9PT, UK
| | | | | |
Collapse
|
41
|
Pande J, Mallhi KK, Sawh A, Szewczyk MM, Simpson F, Grover AK. Aortic smooth muscle and endothelial plasma membrane Ca2+pump isoforms are inhibited differently by the extracellular inhibitor caloxin 1b1. Am J Physiol Cell Physiol 2006; 290:C1341-9. [PMID: 16452157 DOI: 10.1152/ajpcell.00573.2005] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Plasma membrane Ca2+pumps (PMCA) that expel Ca2+from cells are encoded by four genes (PMCA1–4). In this study, we show that aortic endothelium and smooth muscle differ in their PMCA isoform mRNA expression: endothelium expressed predominantly PMCA1, and smooth muscle expressed PMCA4 and a lower level of PMCA1. In this study, we report a novel peptide (caloxin 1b1, obtained by screening for binding to extracellular domain 1 of PMCA4), which inhibited PMCA extracellularly, selectively, and had a higher affinity for PMCA4 than PMCA1. It inhibited the PMCA Ca2+-Mg2+-ATPase activity in leaky erythrocyte ghosts (mainly PMCA4) with a Kivalue of 46 ± 5 μM, making it 10× more potent than the previously reported caloxin 2a1. It was isoform selective because it inhibited the PMCA1 Ca2+-Mg2+-ATPase in human embryonic kidney-293 cells with a higher Kivalue (105 ± 11 μM) than for PMCA4. Caloxin 1b1 was selective in that it did not inhibit other ATPases. Because caloxin 1b1 had been selected to bind to an extracellular domain of PMCA, it could be added directly to cells and tissues to examine its effects on smooth muscle and endothelium. In deendothelialized aortic rings, caloxin 1b1 (200 μM) produced a contraction. It also increased the force of contraction produced by a submaximum concentration of phenylephrine. In aortic rings with endothelium intact, precontracted with phenylephrine and relaxed partially with a submaximum concentration of carbachol, caloxin 1b1 increased the force of contraction rather than potentiating the endothelium-dependent relaxation. In cultured cells, caloxin 1b1 increased the cytosolic [Ca2+] more in arterial smooth muscle cells than in endothelial cells. Thus caloxin 1b1 is the first highly selective extracellular PMCA inhibitor that works better on vascular smooth muscle than on endothelium.
Collapse
Affiliation(s)
- Jyoti Pande
- Department of Medicine, HSC 4N41, McMaster University, 1200 Main St. West, Hamilton, Ontario L8N 3Z5, Canada
| | | | | | | | | | | |
Collapse
|
42
|
Liu L, Ishida Y, Okunade G, Shull GE, Paul RJ. Role of plasma membrane Ca2+-ATPase in contraction-relaxation processes of the bladder: evidence from PMCA gene-ablated mice. Am J Physiol Cell Physiol 2006; 290:C1239-47. [PMID: 16291816 DOI: 10.1152/ajpcell.00440.2005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated the roles and relationships of plasma membrane Ca2+-ATPase (PMCA), sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA)2, and Na+/Ca2+ exchanger (NCX) in bladder smooth muscle contractility in Pmca-ablated mice: Pmca4-null mutant ( Pmca4 −/−) and heterozygous Pmca1 and homozygous Pmca4 double gene-targeted ( Pmca1 +/− Pmca4 −/−) mice. Gene manipulation did not alter the amounts of PMCA1, SERCA2, and NCX. To study the role of each Ca2+ transport system, contraction of circular ring preparations was elicited with KCl (80 mM) plus atropine, and then the muscle was relaxed with Ca2+-free physiological salt solution containing EGTA. We measured the contributions of Ca2+ clearance components by inhibiting SERCA2 (with 10 μM cyclopiazonic acid) and/or NCX (by replacing NaCl with N-methyl-d-glucamine/HCl plus 10 μM KB-R7943). Contraction half-time (time to 50% of maximum tension) was prolonged in the gene-targeted muscles but marginally shortened when SERCA2 or NCX was inhibited. The inhibition of NCX significantly inhibited this prolongation, suggesting that NCX activity might be augmented to compensate for PMCA4 function in the gene-targeted muscles under nonstimulated conditions. Inhibition of SERCA2 and NCX as well as gene targeting all prolonged the relaxation half-time. The contribution of PMCA to relaxation was calculated to be ∼25–30%, with that of SERCA2 being 20% and that of NCX being 70%. PMCA and SERCA2 appeared to function additively, but the function of NCX might overlap with those of other components. In summary, gene manipulation of PMCA indicates that PMCA, in addition to SERCA2 and NCX, plays a significant role in both excitation-contraction coupling and the Ca2+ extrusion-relaxation relationship, i.e., Ca2+ homeostasis, of bladder smooth muscle.
Collapse
Affiliation(s)
- Li Liu
- Department of Molecular & Cellular Physiology, University of Cincinnati College of Medicine, 231 Albert Sabin Way, OH 45267-0576, USA
| | | | | | | | | |
Collapse
|
43
|
Handa S, Momen MA, Sadi AM, Afroze T, Wang C, Husain M. Troubles With a Transgene: Experiences With SM22α-tTA Mice. Circ Res 2005. [DOI: 10.1161/res.97.8.e85-a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Shivalika Handa
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| | - M. Abdul Momen
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| | - Al-Muktafi Sadi
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| | - Talat Afroze
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| | - Changsen Wang
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| | - Mansoor Husain
- Division of Cell & Molecular Biology (T.A., C.W., M.H.), Toronto General Hospital Research Institute, Departments of Medicine (M.A.M., A.-M.S.),, Physiology, and Laboratory Medicine & Pathobiology (S.H., M.H.), Heart & Stroke Richard Lewar Centre for Excellence in Cardiovascular Research, University of Toronto, Canada
| |
Collapse
|
44
|
Keys JR, Zhou RH, Harris DM, Druckman CA, Eckhart AD. Vascular smooth muscle overexpression of G protein-coupled receptor kinase 5 elevates blood pressure, which segregates with sex and is dependent on Gi-mediated signaling. Circulation 2005; 112:1145-53. [PMID: 16103237 DOI: 10.1161/circulationaha.104.531657] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Essential hypertension involves an increase in sympathetic nervous system activity and an associated decrease in beta-adrenergic receptor (AR)-mediated dilation. In addition, increased levels of G protein-coupled receptor (GPCR) kinases (GRKs), which regulate GPCR signaling, are associated with increased blood pressure (BP). METHODS AND RESULTS We generated transgenic mice with approximately 2-fold vascular smooth muscle (VSM)-specific overexpression of GRK5 to recapitulate a selective aspect of hypertension and understand the impact on GPCR regulation of BP. VSM-GRK5 mice were hypertensive, with a 25% to 35% increase in BP, whereas there was no concomitant cardiac or VSM hypertrophy. BP elevations were segregated with sex, with male mice having higher levels than female mice, and ovariectomy did not alter this phenotype. BP was restored to control values with pertussis toxin Gi-signaling inhibition or chronic beta1AR inhibition after 7 days of CGP20712A, whereas the beta2AR antagonist ICI 118,551 was ineffective. Alpha1AR response was not altered, nor was betaAR-mediated dilation in male blood vessels, whereas norepinephrine sensitivity was increased. In contrast, female VSM-GRK5 blood vessels have diminished betaAR-mediated dilation and enhanced sensitivity to angiotensin II (Ang II). CONCLUSIONS Our data suggest that in both male and female mice, VSM-specific overexpression of GRK5 elevates BP mediated by Gi and, at least in part, by beta1AR in males and Ang II receptors in females. Understanding mechanisms underlying an increase in VSM-GRK5 may have a profound influence on the use and development of antihypertensive therapeutics.
Collapse
MESH Headings
- Angiotensin II/pharmacology
- Animals
- Aorta/drug effects
- Aorta/physiology
- Blood Pressure/physiology
- Cyclic AMP/metabolism
- Female
- G-Protein-Coupled Receptor Kinase 5
- GTP-Binding Protein alpha Subunits, Gi-Go/metabolism
- Hypertension/genetics
- Hypertension/metabolism
- Hypertension/physiopathology
- Mice
- Mice, Transgenic
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Ovariectomy
- Potassium Channels/metabolism
- Potassium Chloride/pharmacology
- Protein Serine-Threonine Kinases/genetics
- Receptors, Adrenergic, beta-1/metabolism
- Receptors, Adrenergic, beta-2/metabolism
- Sex Characteristics
- Signal Transduction/physiology
- Transgenes/physiology
- Vasoconstriction/drug effects
- Vasoconstriction/physiology
- Vasoconstrictor Agents/pharmacology
- Vasodilation/drug effects
- Vasodilation/physiology
Collapse
Affiliation(s)
- Janelle R Keys
- Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | | | | | | | | |
Collapse
|
45
|
Pande J, Grover AK. Plasma membrane calcium pumps in smooth muscle: from fictional molecules to novel inhibitors. Can J Physiol Pharmacol 2005; 83:743-54. [PMID: 16333376 DOI: 10.1139/y05-075] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Plasma membrane Ca2+pumps (PMCA pumps) are Ca2+-Mg2+ATPases that expel Ca2+from the cytosol to extracellular space and are pivotal to cell survival and function. PMCA pumps are encoded by the genes PMCA1, -2, -3, and -4. Alternative splicing results in a large number of isoforms that differ in their kinetics and activation by calmodulin and protein kinases A and C. Expression by 4 genes and a multifactorial regulation provide redundancy to allow for animal survival despite genetic defects. Heterozygous mice with ablation of any of the PMCA genes survive and only the homozygous mice with PMCA1 ablation are embryolethal. Some PMCA isoforms may also be involved in other cell functions. Biochemical and biophysical studies of PMCA pumps have been limited by their low levels of expression. Delineation of the exact physiological roles of PMCA pumps has been difficult since most cells also express sarco/endoplasmic reticulum Ca2+pumps and a Na+-Ca2+-exchanger, both of which can lower cytosolic Ca2+. A major limitation in the field has been the lack of specific inhibitors of PMCA pumps. More recently, a class of inhibitors named caloxins have emerged, and these may aid in delineating the roles of PMCA pumps.Key words: ATPases, hypertension, caloxin, protein kinase A, protein kinase C, calmodulin.
Collapse
Affiliation(s)
- Jyoti Pande
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | | |
Collapse
|
46
|
Ishida Y, Paul RJ. Ca2+ clearance in smooth muscle: lessons from gene-altered mice. J Smooth Muscle Res 2005; 41:235-45. [PMID: 16428863 DOI: 10.1540/jsmr.41.235] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The regulation of intracellular [Ca(2+)](i) is important for all cells, but in particular for smooth muscle, as [Ca(2+)](i) is a key second messenger leading to contraction. Mechanisms for the cellular clearance of [Ca(2+)](i) form one side of Ca(2+) homeostasis and include: Plasma Membrane Ca(2+) ATPases (PMCA), Sarcoplasmic/Endoplasmic Reticulum Ca(2+) ATPases (SERCA), Na(+)-Ca(2+)-exchangers (NCX) when coupled to the Na(+)-K(+) ATPases (NKA) and in some cases mitochondria. The nature and relative contribution of these various components of cytosolic Ca(2+) clearance have long been an important topic for study in smooth muscle, particularly as related to regulation of contractility. These studies have largely depended on inhibition of the various components. Recently advances in gene-targeting and transgenesis have made it possible to add or delete individual components, and importantly specific isoforms from the cell. In this brief review, we will focus on new information on Ca(2+) clearance in smooth muscle gained from studies on gene-altered mice models. These provide a deeper understanding of distinct functional roles for individual isoforms and the interactions between various components.
Collapse
Affiliation(s)
- Yukisato Ishida
- Department of Molecular and Cellular Physiology, University of Cincinnati College of Medicine, OH 45267, USA
| | | |
Collapse
|