51
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Sun Z, Williams DJ, Xu B, Gogos JA. Altered function and maturation of primary cortical neurons from a 22q11.2 deletion mouse model of schizophrenia. Transl Psychiatry 2018; 8:85. [PMID: 29666363 PMCID: PMC5904157 DOI: 10.1038/s41398-018-0132-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 12/19/2017] [Accepted: 02/18/2018] [Indexed: 02/05/2023] Open
Abstract
Given its high penetrance, clearly delineated and evolutionary conserved genomic structure, mouse models of the 22q11.2 deletion provide an ideal organism-based and cell-based model of this well-established disease mutation for schizophrenia. In this study we examined the development of changes in intrinsic properties, action potential firing and synaptic transmission using whole-cell patch-clamp recordings of cultured embryonic cortical neurons from Df(16)A +/- and WT mice at DIV7 and DIV14, respectively. Compared to neurons from the WT littermates, significantly increased input resistance and decreased rising rate of action potential was observed in Df(16)A +/- mice at DIV7 but not at DIV14 indicative of delayed neuronal maturation. Neurons from Df(16)A +/- mice also showed significantly higher cellular excitability at both DIV7 and DIV14. Evaluation of Ca2+ homeostasis perturbation caused by 22q11.2 deletion using calcium imaging revealed a significantly lower amplitude of calcium elevation and a smaller area under the curve after depolarization in neurons from Df(16)A +/- mice at both DIV7 and DIV14. Furthermore, the properties of inhibitory synaptic events were significantly altered in Df(16)A +/- mice. We identified changes in mRNA expression profiles, especially in ion channels, receptors, and transporters that may underlie the neurophysiological effects of this mutation. Overall, we show a number of alterations in electrophysiological and calcium homeostatic properties of embryonic cortical neurons from a 22q11.2 deletion mouse model at different culture times and provide valuable insights towards revealing disease mechanisms and discovery of new therapeutic compounds.
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Affiliation(s)
- Ziyi Sun
- Department of Integrated Traditional Chinese and Western Medicine, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, 610041, China. .,Department of Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA.
| | - Damian J. Williams
- 0000 0001 2285 2675grid.239585.0Columbia Stem Cell Core Facility, Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032 USA
| | - Bin Xu
- 0000 0001 2285 2675grid.239585.0Department of Psychiatry, Columbia University Medical Center, New York, NY 10032 USA
| | - Joseph A. Gogos
- 0000000419368729grid.21729.3fDepartment of Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY 10032 USA ,0000 0001 2285 2675grid.239585.0Department of Neuroscience, Columbia University Medical Center, New York, NY 10032 USA
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52
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Regulation of aldosterone production by ion channels: From basal secretion to primary aldosteronism. Biochim Biophys Acta Mol Basis Dis 2018; 1864:871-881. [DOI: 10.1016/j.bbadis.2017.12.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 12/05/2017] [Accepted: 12/23/2017] [Indexed: 01/07/2023]
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53
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Priyadharsini Jayaseelan V, Muthusamy K, Venkatramani S, Arumugam P, Gopalswamy J, Thiagarajan SS. Gender-specific Association of ATP2B1 (rs2681472) Gene Polymorphism with Essential Hypertension in South Indian Population. INT J HUM GENET 2018. [DOI: 10.1080/09723757.2017.1421431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
| | - Karthikeyan Muthusamy
- Department of Bioinformatics, Alagappa University, Karaikudi 630 004, Tamil Nadu, India
| | | | | | - Jayaraman Gopalswamy
- Department of Genetics, Dr. ALM PGIBMS, University of Madras, Taramani, Chennai, Tamil Nadu, India
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54
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Long Y, Chen SW, Gao CL, He XM, Liang GN, Wu J, Jiang CX, Liu X, Wang F, Chen F. ATP2B1 Gene Silencing Increases NO Production Under Basal Conditions Through the Ca 2+/calmodulin/eNOS Signaling Pathway in Endothelial Cells. Hypertens Res 2018; 41:246-252. [PMID: 29416109 DOI: 10.1038/s41440-018-0012-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/19/2017] [Accepted: 07/31/2017] [Indexed: 12/23/2022]
Abstract
Emerging epidemiological and experimental evidence has shown that the ATP2B1 gene is associated with blood pressure control. Impaired eNOS activity and NO production may be among the mechanisms involved. However, little is known about how PMCA1, which is encoded by the ATP2B1 gene, regulates the activity of eNOS and NO production. In the present study, we investigated the role of the ATP2B1 gene in regulating eNOS activity and NO production under basal conditions in HUVECs and explored the mechanisms involved. Silencing ATP2B1 gene expression resulted in higher NO production and eNOS activity under basal conditions in HUVECs. Additionally, ATP2B1 gene silencing resulted in enhanced intracellular calcium concentrations compared to that in the negative siRNA-transfected HUVECs. The enhanced eNOS activity mediated by ATP2B1 gene silencing was Ca2+/calmodulin dependent, as verified by the administration of the calcium chelator BAPTA-AM or the calmodulin-specific antagonist W7. Taken together, silencing ATP2B1 gene expression results in higher NO production and eNOS activity under basal conditions in HUVECs. Furthermore, the enhanced eNOS activity induced by ATP2B1 gene silencing may be mediated via higher levels of intracellular Ca2+, and the effect was confirmed to be dependent on the eNOS-calmodulin interaction.
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Affiliation(s)
- Yang Long
- Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China.,Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Shao-Wei Chen
- Medical Reproduction Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Chen-Lin Gao
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Xue-Mei He
- Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Guan-Nan Liang
- Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Jian Wu
- Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Chun-Xia Jiang
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China
| | | | - Fang Wang
- Medical Reproduction Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China.
| | - Feng Chen
- Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China.
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55
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Singh AK, Singh S, Garg G, Rizvi SI. Rapamycin mitigates erythrocyte membrane transport functions and oxidative stress during aging in rats. Arch Physiol Biochem 2018; 124:45-53. [PMID: 28758804 DOI: 10.1080/13813455.2017.1359629] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Erythrocyte membrane is a suitable model to study various metabolic and physiological functions as it undergoes variety of biochemical changes during aging. An age-dependent modulatory effect of rapamycin on erythrocyte membrane functions is completely unknown. Therefore, the present study was undertaken to investigate the effect of rapamycin on age-dependent impaired activities of transporters/exchangers, altered levels of redox biomarkers, viz. protein carbonyl (PC), lipid hydroperoxides (LHs), total thiol (-SH), sialic acid (SA) and intracellular calcium ion [Ca2+]i, and osmotic fragility of erythrocyte membrane. A significant reduction in membrane-bound activities of Na+/K+-ATPase (NKA) and Ca2+-ATPase (PMCA), and levels of -SH and SA was observed along with a simultaneous induction in Na+/H+ exchanger (NHE) activity and levels of [Ca2+]i, PC, LH and osmotic fragility in old-aged rats. Rapamycin was found to be a promising age-delaying drug that significantly reversed the aging-induced impaired activities of membrane-bound ATPases and altered levels of redox biomarkers.
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Affiliation(s)
| | - Sandeep Singh
- a Department of Biochemistry , University of Allahabad , Allahabad , India
| | - Geetika Garg
- a Department of Biochemistry , University of Allahabad , Allahabad , India
| | - Syed Ibrahim Rizvi
- a Department of Biochemistry , University of Allahabad , Allahabad , India
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56
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Aslam R, Williams LE, Bhatti MF, Virk N. Genome-wide analysis of wheat calcium ATPases and potential role of selected ACAs and ECAs in calcium stress. BMC PLANT BIOLOGY 2017; 17:174. [PMID: 29078753 PMCID: PMC5658947 DOI: 10.1186/s12870-017-1112-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 10/09/2017] [Indexed: 05/02/2023]
Abstract
BACKGROUND P2- type calcium ATPases (ACAs-auto inhibited calcium ATPases and ECAs-endoplasmic reticulum calcium ATPases) belong to the P- type ATPase family of active membrane transporters and are significantly involved in maintaining accurate levels of Ca2+, Mn2+ and Zn2+ in the cytosol as well as playing a very important role in stress signaling, stomatal opening and closing and pollen tube growth. Here we report the identification and possible role of some of these ATPases from wheat. RESULTS In this study, ACA and ECA sequences of six species (belonging to Poaceae) were retrieved from different databases and a phylogenetic tree was constructed. A high degree of evolutionary relatedness was observed among P2 sequences characterized in this study. Members of the respective groups from different plant species were observed to fall under the same clade. This pattern highlights the common ancestry of P2- type calcium ATPases. Furthermore, qRT-PCR was used to analyse the expression of selected ACAs and ECAs from Triticum aestivum (wheat) under calcium toxicity and calcium deficiency. The data indicated that expression of ECAs is enhanced under calcium stress, suggesting possible roles of these ATPases in calcium homeostasis in wheat. Similarly, the expression of ACAs was significantly different in plants grown under calcium stress as compared to plants grown under control conditions. This gives clues to the role of ACAs in signal transduction during calcium stress in wheat. CONCLUSION Here we concluded that wheat genome consists of nine P2B and three P2A -type calcium ATPases. Moreover, gene loss events in wheat ancestors lead to the loss of a particular homoeolog of a gene in wheat. To elaborate the role of these wheat ATPases, qRT-PCR was performed. The results indicated that when plants are exposed to calcium stress, both P2A and P2B gene expression get enhanced. This further gives clues about the possible role of these ATPases in wheat in calcium management. These findings can be useful in future for genetic manipulations as well as in wheat genome annotation process.
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Affiliation(s)
- Roohi Aslam
- Atta-ur-Rahman School of Applied Biosciences, National University of Sciences and Technology, Islamabad, 44000 Pakistan
| | | | - Muhammad Faraz Bhatti
- Atta-ur-Rahman School of Applied Biosciences, National University of Sciences and Technology, Islamabad, 44000 Pakistan
| | - Nasar Virk
- Atta-ur-Rahman School of Applied Biosciences, National University of Sciences and Technology, Islamabad, 44000 Pakistan
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57
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Ip YK, Hiong KC, Goh EJK, Boo MV, Choo CYL, Ching B, Wong WP, Chew SF. The Whitish Inner Mantle of the Giant Clam, Tridacna squamosa, Expresses an Apical Plasma Membrane Ca 2+-ATPase (PMCA) Which Displays Light-Dependent Gene and Protein Expressions. Front Physiol 2017; 8:781. [PMID: 29066980 PMCID: PMC5641333 DOI: 10.3389/fphys.2017.00781] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 09/25/2017] [Indexed: 12/16/2022] Open
Abstract
Giant clams live in symbiosis with extracellular zooxanthellae and display high rates of growth and shell formation (calcification) in light. Light-enhanced calcification requires an increase in the supply of Ca2+ to, and simultaneously an augmented removal of H+ from, the extrapallial fluid where shell formation occurs. We have obtained the complete coding cDNA sequence of Plasma Membrane Ca2+-ATPase (PMCA) from the thin and whitish inner mantle, which is in touch with the extrapallial fluid, of the giant clam Tridacna squamosa. The deduced PMCA sequence consisted of an apical targeting element. Immunofluorescence microscopy confirmed that PMCA had an apical localization in the shell-facing epithelium of the inner mantle, whereby it can actively secrete Ca2+ in exchange for H+. More importantly, the apical PMCA-immunofluorescence of the shell-facing epithelium of the inner mantle increased significantly after 12 h of exposure to light. The transcript and protein levels of PMCA/PMCA also increased significantly in the inner mantle after 6 or 12 h of light exposure. These results offer insights into a light-dependable mechanism of shell formation in T. squamosa and a novel explanation of light-enhanced calcification in general. As the inner mantle normally lacks light sensitive pigments, our results support a previous proposition that symbiotic zooxanthellae, particularly those in the colorful and extensible outer mantle, may act as light-sensing elements for the host clam.
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Affiliation(s)
- Yuen K Ip
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore.,The Tropical Marine Science Institute, National University of Singapore, Singapore, Singapore
| | - Kum C Hiong
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Enan J K Goh
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Mel V Boo
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Celine Y L Choo
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Biyun Ching
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Wai P Wong
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Shit F Chew
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, Singapore
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58
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Long Y, Xia JY, Chen SW, Gao CL, Liang GN, He XM, Wu J, Jiang CX, Liu X, Huang W, Wan Q, Xu Y. ATP2B1 gene Silencing Increases Insulin Sensitivity through Facilitating Akt Activation via the Ca 2+/calmodulin Signaling Pathway and Ca 2+-associated eNOS Activation in Endothelial Cells. Int J Biol Sci 2017; 13:1203-1212. [PMID: 29104511 PMCID: PMC5666335 DOI: 10.7150/ijbs.19666] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 06/28/2017] [Indexed: 01/11/2023] Open
Abstract
Endothelial cell insulin resistance may be partially responsible for the higher risk of atherosclerosis and cardiovascular disease in populations with insulin resistance and type 2 diabetes mellitus (T2DM). A genome-wide association study revealed a significant association between the ATPase plasma membrane Ca2+ transporting 1 (ATP2B1) gene and T2DM in two community-based cohorts from the Korea Association Resource Project. However, little is known about the implication of the ATP2B1 gene on T2DM. In the present study, we investigated the role of the ATP2B1 gene in endothelial cell insulin sensitivity. ATP2B1 gene silencing resulted in enhanced intracellular calcium concentrations and increased insulin-induced Akt activation compared to that in the negative siRNA-transfected HUVECs (Human Umbilical Vein Endothelial Cells). The elevated insulin sensitivity mediated by ATP2B1 gene silencing was Ca2+/calmodulin-dependent, as verified by administration of the calcium chelator BAPTA-AM or the calmodulin-specific antagonist W7. Moreover, higher levels of phosphorylation of eNOS (Ser1177) were observed in ATP2B1-silenced HUVECs. In addition to BAPTA-AM and W7, L-NAME, an eNOS antagonist, abolished insulin-induced Akt phosphorylation at Ser473 in both si-Neg and si-ATP2B1-transfected endothelial cells. These results indicate that the enhanced insulin sensitivity in ATP2B1-silenced endothelial cells is alternatively dependent on an increase in intracellular Ca2+ and the subsequent activation of the Ca2+/calmodulin/eNOS/Akt signaling pathway. In summary, ATP2B1 gene silencing increased insulin sensitivity in endothelial cells by directly modulating the Ca2+/calmodulin signaling pathway and via the Ca2+/calmodulin/eNOS/Akt signaling pathway alternatively.
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Affiliation(s)
- Yang Long
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China.,Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Ji-Yi Xia
- Key Laboratory of Medical Electrophysiology of Ministry of Education, Collaborative Innovation Center for Prevention and Treatment of Cardiovascular Disease, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Shao-Wei Chen
- Medical Reproduction Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Chen-Lin Gao
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Guan-Nan Liang
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Xue-Mei He
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Jian Wu
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Chun-Xia Jiang
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Xin Liu
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Wei Huang
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Qin Wan
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Yong Xu
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China.,Key Laboratory of Medical Electrophysiology of Ministry of Education, Collaborative Innovation Center for Prevention and Treatment of Cardiovascular Disease, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, 646000, Sichuan, P R China
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59
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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.
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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
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60
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Lestari SW, Miati DN, Seoharso P, Sugiyanto R, Pujianto DA. Sperm Na+, K+-ATPase α4 and plasma membrane Ca2+-ATPase (PMCA) 4 regulation in asthenozoospermia. Syst Biol Reprod Med 2017; 63:294-302. [DOI: 10.1080/19396368.2017.1348565] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Silvia W. Lestari
- Department of Medical Biology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - Dessy Noor Miati
- Master Program for Biomedical Sciences, Faculty of Medicine, Universitas Indonesi, Jakara, Indonesia
| | - P. Seoharso
- Department of Medical Biology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - R. Sugiyanto
- Department of Medical Biochemistry, Faculty of Medicine, Universitas Kristen Indonesia, Jakarta, Indonesia
| | - Dwi A. Pujianto
- Department of Medical Biology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
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61
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Mata AM. Functional interplay between plasma membrane Ca 2+-ATPase, amyloid β-peptide and tau. Neurosci Lett 2017; 663:55-59. [PMID: 28780168 DOI: 10.1016/j.neulet.2017.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 07/12/2017] [Accepted: 08/01/2017] [Indexed: 12/26/2022]
Abstract
It is well known that dysregulation of Ca2+ homeostasis is involved in Alzheimeŕs disease (AD), a neurodegenerative disorder characterized by the presence of toxic aggregates of amyloid β-peptide (Aβ) and neurofibrillary tangles of tau. Alteration of calcium signaling has been linked to Aβ and tau pathologies, although the understanding of underlying molecular and cellular mechanisms is far from clear. This review summarizes the functional inhibition of plasma membrane Ca2+-ATPase (PMCA) by Aβ and tau, and its modulation by calmodulin and the ionic nature of phospholipids. The data obtained until now in our laboratory suggest that PMCA injury linked to Aβ and tau can be significantly involved in the cascade of events leading to intracellular calcium overload associated to AD.
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Affiliation(s)
- Ana M Mata
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad de Extremadura, 06006 Badajoz, Spain.
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62
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Dalghi MG, Ferreira-Gomes M, Montalbetti N, Simonin A, Strehler EE, Hediger MA, Rossi JP. Cortical cytoskeleton dynamics regulates plasma membrane calcium ATPase isoform-2 (PMCA2) activity. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:1413-1424. [DOI: 10.1016/j.bbamcr.2017.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/11/2017] [Accepted: 05/15/2017] [Indexed: 01/17/2023]
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63
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Fernandes-Rosa FL, Boulkroun S, Zennaro MC. Somatic and inherited mutations in primary aldosteronism. J Mol Endocrinol 2017; 59:R47-R63. [PMID: 28400483 DOI: 10.1530/jme-17-0035] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 04/11/2017] [Indexed: 01/22/2023]
Abstract
Primary aldosteronism (PA), the most common form of secondary hypertension, is caused in the majority of cases by unilateral aldosterone-producing adenoma (APA) or bilateral adrenal hyperplasia. Over the past few years, somatic mutations in KCNJ5, CACNA1D, ATP1A1 and ATP2B3 have been proven to be associated with APA development, representing more than 50% of sporadic APA. The identification of these mutations has allowed the development of a model for APA involving modification on the intracellular ionic equilibrium and regulation of cell membrane potential, leading to autonomous aldosterone overproduction. Furthermore, somatic CTNNB1 mutations have also been identified in APA, but the link between these mutations and APA development remains unknown. The sequence of events responsible for APA formation is not completely understood, in particular, whether a single hit or a double hit is responsible for both aldosterone overproduction and cell proliferation. Germline mutations identified in patients with early-onset PA have expanded the classification of familial forms (FH) of PA. The description of germline KCNJ5 and CACNA1H mutations has identified FH-III and FH-IV based on genetic findings; germline CACNA1D mutations have been identified in patients with very early-onset PA and severe neurological abnormalities. This review summarizes current knowledge on the genetic basis of PA, the association of driver gene mutations and clinical findings and in the contribution to patient care, plus the current understanding on the mechanisms of APA development.
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Affiliation(s)
- Fabio Luiz Fernandes-Rosa
- INSERMUMRS_970, Paris Cardiovascular Research Center, Paris, France
- University Paris DescartesSorbonne Paris Cité, Paris, France
- Assistance Publique-Hôpitaux de ParisHôpital Européen Georges Pompidou, Service de Génétique, Paris, France
| | - Sheerazed Boulkroun
- INSERMUMRS_970, Paris Cardiovascular Research Center, Paris, France
- University Paris DescartesSorbonne Paris Cité, Paris, France
| | - Maria-Christina Zennaro
- INSERMUMRS_970, Paris Cardiovascular Research Center, Paris, France
- University Paris DescartesSorbonne Paris Cité, Paris, France
- Assistance Publique-Hôpitaux de ParisHôpital Européen Georges Pompidou, Service de Génétique, Paris, France
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64
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Long-term effect of a chronic low-protein multideficient diet on the heart: Hypertension and heart failure in chronically malnourished young adult rats. Int J Cardiol 2017; 238:43-56. [DOI: 10.1016/j.ijcard.2017.03.110] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 03/16/2017] [Accepted: 03/24/2017] [Indexed: 01/21/2023]
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65
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Bandulik S. Of channels and pumps: different ways to boost the aldosterone? Acta Physiol (Oxf) 2017; 220:332-360. [PMID: 27862984 DOI: 10.1111/apha.12832] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/10/2016] [Accepted: 11/11/2016] [Indexed: 01/19/2023]
Abstract
The mineralocorticoid aldosterone is a major factor controlling the salt and water balance and thereby also the arterial blood pressure. Accordingly, primary aldosteronism (PA) characterized by an inappropriately high aldosterone secretion is the most common form of secondary hypertension. The physiological stimulation of aldosterone synthesis in adrenocortical glomerulosa cells by angiotensin II and an increased plasma K+ concentration depends on a membrane depolarization and an increase in the cytosolic Ca2+ activity. Recurrent gain-of-function mutations of ion channels and transporters have been identified in a majority of cases of aldosterone-producing adenomas and in familial forms of PA. In this review, the physiological role of these genes in the regulation of aldosterone synthesis and the altered function of the mutant proteins as well are described. The specific changes of the membrane potential and the cellular ion homoeostasis in adrenal cells expressing the different mutants are compared, and their impact on autonomous aldosterone production and proliferation is discussed.
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Affiliation(s)
- S. Bandulik
- Medical Cell Biology; University of Regensburg; Regensburg Germany
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66
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Hou QL, Luo JX, Zhang BC, Jiang GF, Ding W, Zhang YQ. 3D-QSAR and Molecular Docking Studies on the TcPMCA1-Mediated Detoxification of Scopoletin and Coumarin Derivatives. Int J Mol Sci 2017; 18:E1380. [PMID: 28653986 PMCID: PMC5535873 DOI: 10.3390/ijms18071380] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Revised: 06/20/2017] [Accepted: 06/20/2017] [Indexed: 12/14/2022] Open
Abstract
The carmine spider mite, Tetranychus cinnabarinus (Boisduval), is an economically important agricultural pest that is difficult to prevent and control. Scopoletin is a botanical coumarin derivative that targets Ca2+-ATPase to exert a strong acaricidal effect on carmine spider mites. In this study, the full-length cDNA sequence of a plasma membrane Ca2+-ATPase 1 gene (TcPMCA1) was cloned. The sequence contains an open reading frame of 3750 bp and encodes a putative protein of 1249 amino acids. The effects of scopoletin on TcPMCA1 expression were investigated. TcPMCA1 was significantly upregulated after it was exposed to 10%, 30%, and 50% of the lethal concentration of scopoletin. Homology modeling, molecular docking, and three-dimensional quantitative structure-activity relationships were then studied to explore the relationship between scopoletin structure and TcPMCA1-inhibiting activity of scopoletin and other 30 coumarin derivatives. Results showed that scopoletin inserts into the binding cavity and interacts with amino acid residues at the binding site of the TcPMCA1 protein through the driving forces of hydrogen bonds. Furthermore, CoMFA (comparative molecular field analysis)- and CoMSIA (comparative molecular similarity index analysis)-derived models showed that the steric and H-bond fields of these compounds exert important influences on the activities of the coumarin compounds.Notably, the C3, C6, and C7 positions in the skeletal structure of the coumarins are the most suitable active sites. This work provides insights into the mechanism underlying the interaction of scopoletin with TcPMCA1. The present results can improve the understanding on plasma membrane Ca2+-ATPase-mediated (PMCA-mediated) detoxification of scopoletin and coumarin derivatives in T. cinnabarinus, as well as provide valuable information for the design of novel PMCA-inhibiting acaricides.
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Affiliation(s)
- Qiu-Li Hou
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Jin-Xiang Luo
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Bing-Chuan Zhang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Gao-Fei Jiang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Wei Ding
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Yong-Qiang Zhang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
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67
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Tolstykh GP, Olsovsky CA, Ibey BL, Beier HT. Ryanodine and IP 3 receptor-mediated calcium signaling play a pivotal role in neurological infrared laser modulation. NEUROPHOTONICS 2017; 4:025001. [PMID: 28413806 PMCID: PMC5381754 DOI: 10.1117/1.nph.4.2.025001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 03/20/2017] [Indexed: 05/13/2023]
Abstract
Pulsed infrared (IR) laser energy has been shown to modulate neurological activity through both stimulation and inhibition of action potentials. While the mechanism(s) behind this phenomenon is (are) not completely understood, certain hypotheses suggest that the rise in temperature from IR exposure could activate temperature- or pressure-sensitive ion channels or create pores in the cellular outer membrane, allowing an influx of typically plasma-membrane-impermeant ions. Studies using fluorescent intensity-based calcium ion ([Formula: see text]) sensitive dyes show changes in [Formula: see text] levels after various IR stimulation parameters, which suggests that [Formula: see text] may originate from the external solution. However, activation of intracellular signaling pathways has also been demonstrated, indicating a more complex mechanism of increasing intracellular [Formula: see text] concentration. We quantified the [Formula: see text] mobilization in terms of influx from the external solution and efflux from intracellular organelles using Fura-2 and a high-speed ratiometric imaging system that rapidly alternates the dye excitation wavelengths. Using nonexcitable Chinese hamster ovarian ([Formula: see text]) cells and neuroblastoma-glioma (NG108) cells, we demonstrate that intracellular [Formula: see text] receptors play an important role in the IR-induced [Formula: see text], with the [Formula: see text] response augmented by ryanodine receptors in excitable cells.
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Affiliation(s)
- Gleb P. Tolstykh
- General Dynamics Information Technology, JBSA Fort Sam Houston, San Antonio, Texas, United States
- Address all correspondence to: Gleb P. Tolstykh, E-mail:
| | - Cory A. Olsovsky
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas, United States
| | - Bennett L. Ibey
- Air Force Research Laboratory, 711th Human Performance Wing, Airman Systems Directorate, Bioeffects Division, Radio Frequency Bioeffects Branch, JBSA Fort Sam Houston, San Antonio, Texas, United States
| | - Hope T. Beier
- Air Force Research Laboratory, 711th Human Performance Wing, Airman System Directorate, Bioeffects Division, Optical Radiation Bioeffects Branch, JBSA Fort Sam Houston, San Antonio, Texas, United States
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68
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Olli KE, Li K, Galileo DS, Martin-DeLeon PA. Plasma membrane calcium ATPase 4 (PMCA4) co-ordinates calcium and nitric oxide signaling in regulating murine sperm functional activity. J Cell Physiol 2017; 233:11-22. [PMID: 28247940 DOI: 10.1002/jcp.25882] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 02/27/2017] [Indexed: 12/18/2022]
Abstract
Reduced sperm motility (asthenospermia) and resulting infertility arise from deletion of the Plasma Membrane Ca2+ -ATPase 4 (Pmca4) gene which encodes the highly conserved Ca2+ efflux pump, PMCA4. This is the major Ca2+ clearance protein in murine sperm. Since the mechanism underlying asthenospermia in PMCA4's absence or reduced activity is unknown, we investigated if sperm PMCA4 negatively regulates nitric oxide synthases (NOSs) and when absent NO, peroxynitrite, and oxidative stress levels are increased. Using co-immunoprecipitation (Co-IP) and Fluorescence Resonance Energy Transfer (FRET), we show an association of PMCA4 with the NOSs in elevated cytosolic [Ca2+ ] in capacitated and Ca2+ ionophore-treated sperm and with neuronal (nNOS) at basal [Ca2+ ] (ucapacitated sperm). FRET efficiencies for PMCA4-eNOS were 35% and 23% in capacitated and uncapacitated sperm, significantly (p < 0.01) different, with the molecules being <10 nm apart. For PMCA4-nNOS, this interaction was seen only for capacitated sperm where FRET efficiency was 24%, significantly (p < 0.05) higher than in uncapacitated sperm (6%). PMCA4 and the NOSs were identified as interacting partners in a quaternary complex that includes Caveolin1, which co-immunoprecipitated with eNOS in a Ca2+ -dependent manner. In Pmca4-/- sperm NOS activity was elevated twofold in capacitated/uncapacitated sperm (vs. wild-type), accompanied by a twofold increase in peroxynitrite levels and significantly (p < 0.001) increased numbers of apoptotic germ cells. The data support a quaternary complex model in which PMCA4 co-ordinates Ca2+ and NO signaling to maintain motility, with increased NO levels resulting in asthenospermia in Pmca4-/- males. They suggest the involvement of PMCA4 mutations in human asthenospermia, with diagnostic relevance.
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Affiliation(s)
- Kristine E Olli
- Department of Biological Sciences, University of Delaware, Newark, Delaware
| | - Kun Li
- Department of Biological Sciences, University of Delaware, Newark, Delaware
| | - Deni S Galileo
- Department of Biological Sciences, University of Delaware, Newark, Delaware
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69
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Coffua LS, Martin-DeLeon PA. Effectiveness of a walnut-enriched diet on murine sperm: involvement of reduced peroxidative damage. Heliyon 2017; 3:e00250. [PMID: 28239673 PMCID: PMC5318272 DOI: 10.1016/j.heliyon.2017.e00250] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 01/09/2017] [Accepted: 02/08/2017] [Indexed: 01/01/2023] Open
Abstract
A walnut supplement for a Western-style diet in men was shown to improve sperm motility, vitality, and morphology. To gain further insights into factors underlying this improvement, we administered a parallel walnut-enriched diet to mice [including those with a defect in sperm motility due to deletion of Plasma Membrane Ca2+-ATPase 4 (Pmca4-/- )] to determine if there is a similar improvement that is accompanied by reduced sperm membrane peroxidative damage. Although sperm vitality and acrosome reaction rate were unaffected, the diet led to a significant improvement in motility (P < 0.05) and morphology (P < 0.04) in wild-type sperm and in morphology (P < 0.01) in Pmca4-/- , confirming the diet's efficacy, which appeared to be more modest in mice than in humans. In both strains of mice, the diet resulted in a significant decrease in sperm lipid peroxidation (oxidative stress) levels, but did not rescue the significantly increased apoptotic levels seen in the testis and epididymis of Pmca4 nulls. Our findings support the effectiveness of walnuts on sperm quality, associated with reduced peroxidative damage; and suggest that oxidative stress is involved in the mechanism(s) underlying male reproductive defects in Pmca4-/- .
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70
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Country MW, Jonz MG. Calcium dynamics and regulation in horizontal cells of the vertebrate retina: lessons from teleosts. J Neurophysiol 2017; 117:523-536. [PMID: 27832601 PMCID: PMC5288477 DOI: 10.1152/jn.00585.2016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 11/02/2016] [Indexed: 01/20/2023] Open
Abstract
Horizontal cells (HCs) are inhibitory interneurons of the vertebrate retina. Unlike typical neurons, HCs are chronically depolarized in the dark, leading to a constant influx of Ca2+ Therefore, mechanisms of Ca2+ homeostasis in HCs must differ from neurons elsewhere in the central nervous system, which undergo excitotoxicity when they are chronically depolarized or stressed with Ca2+ HCs are especially well characterized in teleost fish and have been used to unlock mysteries of the vertebrate retina for over one century. More recently, mammalian models of the retina have been increasingly informative for HC physiology. We draw from both teleost and mammalian models in this review, using a comparative approach to examine what is known about Ca2+ pathways in vertebrate HCs. We begin with a survey of Ca2+-permeable ion channels, exchangers, and pumps and summarize Ca2+ influx and efflux pathways, buffering, and intracellular stores. This includes evidence for Ca2+-permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors and N-methyl-d-aspartate receptors and for voltage-gated Ca2+ channels. Special attention is given to interactions between ion channels, to differences among species, and in which subtypes of HCs these channels have been found. We then discuss a number of unresolved issues pertaining to Ca2+ dynamics in HCs, including a potential role for Ca2+ in feedback to photoreceptors, the role for Ca2+-induced Ca2+ release, and the properties and functions of Ca2+-based action potentials. This review aims to highlight the unique Ca2+ dynamics in HCs, as these are inextricably tied to retinal function.
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Affiliation(s)
- Michael W Country
- Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
| | - Michael G Jonz
- Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
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71
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Lin PH, Jian CY, Chou JC, Chen CW, Chen CC, Soong C, Hu S, Lieu FK, Wang PS, Wang SW. Induction of renal senescence marker protein-30 (SMP30) expression by testosterone and its contribution to urinary calcium absorption in male rats. Sci Rep 2016; 6:32085. [PMID: 27553527 PMCID: PMC4995462 DOI: 10.1038/srep32085] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 08/02/2016] [Indexed: 11/09/2022] Open
Abstract
The aim of this study was to investigate the involvement of androgen, mainly testosterone, in the expression of renal senescence marker protein-30 (SMP30) in male rats. We found that the renal SMP30 expression was up-regulated by endogenous testosterone stimulation during puberty. Interestingly, androgen-deficient orchidectomized (ORX) rats exhibited lower SMP30 mRNA and protein expression in the kidney, and that was restored by testosterone propionate (TP) replacement. Abrogation of androgen receptor (AR) activity by co-treatment with flutamide abolished testosterone-induced SMP30 expression in the kidney as well as in the NRK52E cells. However, SMP30 expression was unaltered in the liver of ORX rats. We also showed a positive correlation between renal SMP30 expression and plasma testosterone level during the aging process. TP-induced SMP30 expression in ovariectomized (OVX) rats was observed and was an evidence to explain the gender difference of SMP30 levels. Immunofluorescence assay showed that renal SMP30 was specifically expressed in the proximal tubular segments of the kidney. The urinary Ca(2+) level was increased in both ORX and male aging rats. Taken together, our results indicate a novel role of testosterone in regulating SMP30 expression specifically in the kidney to contribute to urinary calcium absorption.
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Affiliation(s)
- Po-Han Lin
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan, Republic of China
| | - Cai-Yun Jian
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan, Republic of China
| | - Jou-Chun Chou
- Medical Center of Aging Research, China Medical University Hospital, Taichung 40402, Taiwan, Republic of China
| | - Chien-Wei Chen
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan, Republic of China
| | - Chih-Chieh Chen
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan, Republic of China
| | - Christina Soong
- Department of Rehabilitation, Cheng Hsin General Hospital, Taipei 11212, Taiwan, Republic of China
| | - Sindy Hu
- Aesthetic Medical Center, Department of Dermatology, Chang Gung Memorial Hospital, Taoyuan 33378, Taiwan, Republic of China.,Department of Medicine, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan, Republic of China
| | - Fu-Kong Lieu
- Department of Rehabilitation, Cheng Hsin General Hospital, Taipei 11212, Taiwan, Republic of China
| | - Paulus S Wang
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan, Republic of China.,Medical Center of Aging Research, China Medical University Hospital, Taichung 40402, Taiwan, Republic of China.,Department of Biotechnology, College of Health Science, Asia University, Taichung 41354, Taiwan, Republic of China.,Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei 11217, Taiwan, Republic of China
| | - Shyi-Wu Wang
- Aesthetic Medical Center, Department of Dermatology, Chang Gung Memorial Hospital, Taoyuan 33378, Taiwan, Republic of China.,Department of Physiology and Pharmacology, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan, Republic of China
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72
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Tauber P, Aichinger B, Christ C, Stindl J, Rhayem Y, Beuschlein F, Warth R, Bandulik S. Cellular Pathophysiology of an Adrenal Adenoma-Associated Mutant of the Plasma Membrane Ca(2+)-ATPase ATP2B3. Endocrinology 2016; 157:2489-99. [PMID: 27035656 DOI: 10.1210/en.2015-2029] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Adrenal aldosterone-producing adenomas (APAs) are a main cause for primary aldosteronism leading to arterial hypertension. Physiologically, aldosterone production in the adrenal gland is stimulated by angiotensin II and high extracellular potassium. These stimuli lead to a depolarization of the plasma membrane and, as a consequence, an increase of intracellular Ca(2+). Mutations of the plasma membrane Ca(2+)-ATPase ATP2B3 have been found in APAs with a prevalence of 0.6%-3.1%. Here, we investigated the effects of the APA-associated ATP2B3(Leu425_Val426del) mutation in adrenocortical NCI-H295R and human embryonic kidney (HEK-293) cells. Ca(2+) measurements revealed a higher basal Ca(2+) level in cells expressing the mutant ATP2B3. This rise in intracellular Ca(2+) was even more pronounced under conditions with high extracellular Ca(2+) pointing to an increased Ca(2+) influx associated with the mutated protein. Furthermore, cells with the mutant ATP2B3 appeared to have a reduced capacity to export Ca(2+) suggesting a loss of the physiological pump function. Surprisingly, expression of the mutant ATP2B3 caused a Na(+)-dependent inward current that strongly depolarized the plasma membrane and compromised the cytosolic cation composition. In parallel to these findings, mRNA expression of the cytochrome P450, family 11, subfamily B, polypeptide 2 (aldosterone synthase) was substantially increased and aldosterone production was enhanced in cells overexpressing mutant ATP2B3. In summary, the APA-associated ATP2B3(Leu425_Val426del) mutant promotes aldosterone production by at least 2 different mechanisms: 1) a reduced Ca(2+) export due to the loss of the physiological pump function; and 2) an increased Ca(2+) influx due to opening of depolarization-activated Ca(2+) channels as well as a possible Ca(2+) leak through the mutated pump.
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Affiliation(s)
- Philipp Tauber
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - B Aichinger
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - C Christ
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - J Stindl
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - Y Rhayem
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - F Beuschlein
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - R Warth
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
| | - S Bandulik
- Medical Cell Biology (P.T., B.A., C.C., J.S., R.W., S.B.), University of Regensburg, 93053 Regensburg, Germany; and Medizinische Klinik und Poliklinik IV (Y.R., F.B.), Ludwig-Maximilians-Universität, 80336 Munich, Germany
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73
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Martin-DeLeon PA. Epididymosomes: transfer of fertility-modulating proteins to the sperm surface. Asian J Androl 2016; 17:720-5. [PMID: 26112481 PMCID: PMC4577579 DOI: 10.4103/1008-682x.155538] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
A variety of glycosylphosphatidylinositol (GPI)-linked proteins are acquired on spermatozoa from epididymal luminal fluids (ELF) during sperm maturation. These proteins serve roles in immunoprotection and in key steps of fertilization such as capacitation, acrosomal exocytosis and sperm-egg interactions. Their acquisition on sperm cells is mediated both by membrane vesicles (epididymosomes, EP) which were first reported to dock on the sperm surface, and by lipid carriers which facilitate the transfer of proteins associated with the membrane-free fraction of ELF. While the nonvesicular fraction is more efficient, both pathways are dependent on hydrophobic interactions between the GPI-anchor and the external lipid layer of the sperm surface. More recently proteomic and hypothesis-driven studies have shown that EP from several mammals carry transmembrane (TM) proteins, including plasma membrane Ca 2 + -ATPase 4 (PMCA4). Synthesized in the testis, PMCA4 is an essential protein and the major Ca 2 + efflux pump in murine spermatozoa. Delivery of PMCA4 to spermatozoa from bovine and mouse EP during epididymal maturation and in vitro suggests that the docking of EP on the sperm surface precedes fusion, and experimental evidence supports a fusogenic mechanism for TM proteins. Fusion is facilitated by CD9, which generates fusion-competent sites on membranes. On the basis of knowledge of PMCA4's interacting partners a number of TM and membrane-associated proteins have been identified or are predicted to be present, in the epididymosomal cargo deliverable to spermatozoa. These Ca 2 + -dependent proteins, undetected in proteomic studies, play essential roles in sperm motility and fertility, and their detection highlights the usefulness of the hypothesis-driven approach.
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74
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Tran QK, Firkins R, Giles J, Francis S, Matnishian V, Tran P, VerMeer M, Jasurda J, Burgard MA, Gebert-Oberle B. Estrogen Enhances Linkage in the Vascular Endothelial Calmodulin Network via a Feedforward Mechanism at the G Protein-coupled Estrogen Receptor 1. J Biol Chem 2016; 291:10805-23. [PMID: 26987903 DOI: 10.1074/jbc.m115.697334] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Indexed: 12/13/2022] Open
Abstract
Estrogen exerts many effects on the vascular endothelium. Calmodulin (CaM) is the transducer of Ca(2+) signals and is a limiting factor in cardiovascular tissues. It is unknown whether and how estrogen modifies endothelial functions via the network of CaM-dependent proteins. Here we show that 17β-estradiol (E2) up-regulates total CaM level in endothelial cells. Concurrent measurement of Ca(2+) and Ca(2+)-CaM indicated that E2 also increases free Ca(2+)-CaM. Pharmacological studies, gene silencing, and receptor expression-specific cell studies indicated that the G protein-coupled estrogen receptor 1 (GPER/GPR30) mediates these effects via transactivation of EGFR and subsequent MAPK activation. The outcomes were then examined on four distinct members of the intracellular CaM target network, including GPER/GPR30 itself and estrogen receptor α, the plasma membrane Ca(2+)-ATPase (PMCA), and endothelial nitric-oxide synthase (eNOS). E2 substantially increases CaM binding to estrogen receptor α and GPER/GPR30. Mutations that reduced CaM binding to GPER/GPR30 in separate binding domains do not affect GPER/GPR30-Gβγ preassociation but decrease GPER/GPR30-mediated ERK1/2 phosphorylation. E2 increases CaM-PMCA association, but the expected stimulation of Ca(2+) efflux is reversed by E2-stimulated tyrosine phosphorylation of PMCA. These effects sustain Ca(2+) signals and promote Ca(2+)-dependent CaM interactions with other CaM targets. Consequently, E2 doubles CaM-eNOS interaction and also promotes dual phosphorylation of eNOS at Ser-617 and Ser-1179. Calculations using in-cell and in vitro data revealed substantial individual and combined contribution of these effects to total eNOS activity. Taken together, E2 generates a feedforward loop via GPER/GPR30, which enhances Ca(2+)/CaM signals and functional linkage in the endothelial CaM target network.
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Affiliation(s)
- Quang-Kim Tran
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Rachel Firkins
- 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
| | - Sarah Francis
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Vahe Matnishian
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Phuong 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
| | - Jake Jasurda
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Michelle Ann Burgard
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
| | - Briana Gebert-Oberle
- From the Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa 50312
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75
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Little R, Cartwright EJ, Neyses L, Austin C. Plasma membrane calcium ATPases (PMCAs) as potential targets for the treatment of essential hypertension. Pharmacol Ther 2016; 159:23-34. [PMID: 26820758 DOI: 10.1016/j.pharmthera.2016.01.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The incidence of hypertension, the major modifiable risk factor for cardiovascular disease, is increasing. Thus, there is a pressing need for the development of new and more effective strategies to prevent and treat hypertension. Development of these relies on a continued evolution of our understanding of the mechanisms which control blood pressure (BP). Resistance arteries are important in the regulation of total peripheral resistance and BP; changes in their structure and function are strongly associated with hypertension. Anti-hypertensives which both reduce BP and reverse changes in resistance arterial structure reduce cardiovascular risk more than therapies which reduce BP alone. Hence, identification of novel potential vascular targets which modify BP is important. Hypertension is a multifactorial disorder which may include a genetic component. Genome wide association studies have identified ATP2B1, encoding the calcium pump plasma membrane calcium ATPase 1 (PMCA1), as having a strong association with BP and hypertension. Knockdown or reduced PMCA1 expression in mice has confirmed a physiological role for PMCA1 in BP and resistance arterial regulation. Altered expression or inhibition of PMCA4 has also been shown to modulate these parameters. The mechanisms whereby PMCA1 and 4 can modulate vascular function remain to be fully elucidated but may involve regulation of intracellular calcium homeostasis and/or comprise a structural role. However, clear physiological links between PMCA and BP, coupled with experimental studies directly linking PMCA1 and 4 to changes in BP and arterial function, suggest that they may be important targets for the development of new pharmacological modulators of BP.
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Affiliation(s)
- Robert Little
- The Institute of Cardiovascular Sciences, The University of Manchester, UK
| | | | - Ludwig Neyses
- The Institute of Cardiovascular Sciences, The University of Manchester, UK
| | - Clare Austin
- Faculty of Health and Social Care, Edge Hill University, UK.
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Murakami M, Yoshimoto T, Minami I, Bouchi R, Tsuchiya K, Hashimoto K, Izumiyama H, Fujii Y, Endo T, Akashi T, Nishimoto K, Mukai K, Kihara K, Ogawa Y. A Novel Somatic Deletion Mutation of ATP2B3 in Aldosterone-Producing Adenoma. Endocr Pathol 2015; 26:328-33. [PMID: 26481629 DOI: 10.1007/s12022-015-9400-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Aldosterone-producing adenoma (APA) is a form of primary aldosteronism (PA). Recent studies suggested that somatic mutations in the KCNJ5, ATP1A1, ATP2B3, and CACNA1D genes are involved in the pathogenesis of APA. We report a case of a 62-year-old man diagnosed as PA with left adrenal mass. He underwent adrenalectomy for treatment. We identified a novel somatic deletion mutation in ATP2B3 in the adrenal tumor: c.1269_1274delTGTGCT which spans three codons (423-425) resulting in p.Val424_Leu425del. Immunohistochemical analysis revealed strong expression of aldosterone synthase (CYP11B2) in the tumor tissue, which is consistent with APA. Here, we identified a novel somatic deletion mutation in ATP2B3, which results in the amino acid sequences increasing intracellular calcium concentrations as reported previously, leading to increased aldosterone synthase (CYP11B2) expression and following excess aldosterone production in the APA cells. The novel ATP2B3 mutation detected in our case supports the pathogenic significance of the locus spanning the codon 424-426 of ATP2B3.
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Affiliation(s)
- Masanori Murakami
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Takanobu Yoshimoto
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.
| | - Isao Minami
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Ryotaro Bouchi
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Kyoichiro Tsuchiya
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Koshi Hashimoto
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
- Department of Preemptive Medicine and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Hajime Izumiyama
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
- Center for Medical Welfare and Liaison Services, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Yasuhisa Fujii
- Department of Urology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Takashi Endo
- Department of Pathology, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Takumi Akashi
- Department of Pathology, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Koshiro Nishimoto
- Department of Urology, Tachikawa Hospital, Tokyo, 190-0022, Japan
- Department of Biochemistry, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Kuniaki Mukai
- Department of Biochemistry, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Kazunori Kihara
- Department of Urology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Yoshihiro Ogawa
- Department of Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
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77
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Monesterolo NE, Nigra AD, Campetelli AN, Santander VS, Rivelli JF, Arce CA, Casale CH. PMCA activity and membrane tubulin affect deformability of erythrocytes from normal and hypertensive human subjects. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2813-20. [DOI: 10.1016/j.bbamem.2015.08.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 08/12/2015] [Accepted: 08/16/2015] [Indexed: 11/30/2022]
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78
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Muzi-Filho H, Souza AM, Bezerra CGP, Boldrini LC, Takiya CM, Oliveira FL, Nesi RT, Valença SS, Silva AMS, Zapata-Sudo G, Sudo RT, Einicker-Lamas M, Vieyra A, Lara LS, Cunha VMN. Rats undernourished in utero have altered Ca2+ signaling and reduced fertility in adulthood. Physiol Rep 2015; 3:3/10/e12587. [PMID: 26508737 PMCID: PMC4632956 DOI: 10.14814/phy2.12587] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Epidemiological and animal studies have shown that placental undernutrition impairs reproduction in adult offspring, but the underlying molecular mechanisms within the male genital tract remain unknown. Due to its special physiological characteristics in transport and the modulation of the environment to which its luminal content is exposed, we hypothesized that the vas deferens would be a highly sensitive target. The goals were to investigate whether intrauterine malnutrition affects molecular mechanisms related to Ca(2+)- and oxidative stress-modulated processes and causes structural alterations in the adult rat vas deferens that could attenuate fecundity and fertility. Male adult rats malnourished in utero had increased vas deferens weight associated with thickening of the muscular coat, a decrease in the total and haploid germ cells, a marked increase in the immature cells, and a decline in the numbers of pregnant females and total offspring per male rat. The ex vivo response of vas deferens from malnourished rats demonstrated an accentuated decrease in the contractile response to phenylephrine. The vas deferens had a marked decrease in Ca(2+) transport due to the uncoupling of Ca(2+)-stimulated ATP hydrolysis and ATP-driven Ca(2+) flux, and the downregulation of both sarco-endoplasmic reticulum Ca(2+)-ATPase 2 and the coupling factor 12-kDa FK506-binding protein. An increase in protein carbonylation (a marker of oxidative damage) and an imbalance between protein kinases C and A were observed as a legacy of undernutrition in early life. These results provide the structural and molecular basis to explain at least in part how maternal undernutrition affects fecundity and fertility in adult male rats.
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Affiliation(s)
- Humberto Muzi-Filho
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Alessandro M Souza
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Camila G P Bezerra
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leonardo C Boldrini
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil Directorate of Metrology Applied Life Sciences, National Institute of Metrology, Quality and Technology, Duque de Caxias, Brazil
| | - Christina M Takiya
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Felipe L Oliveira
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Renata T Nesi
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Samuel S Valença
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ananssa M S Silva
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gisele Zapata-Sudo
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Roberto T Sudo
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcelo Einicker-Lamas
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Lucienne S Lara
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Valeria M N Cunha
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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79
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Andrews RE, Galileo DS, Martin-DeLeon PA. Plasma membrane Ca2+-ATPase 4: interaction with constitutive nitric oxide synthases in human sperm and prostasomes which carry Ca2+/CaM-dependent serine kinase. Mol Hum Reprod 2015; 21:832-43. [PMID: 26345709 DOI: 10.1093/molehr/gav049] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 08/31/2015] [Indexed: 11/12/2022] Open
Abstract
Deletion of the gene encoding the widely conserved plasma membrane calcium ATPase 4 (PMCA4), a major Ca(2+) efflux pump, leads to loss of sperm motility and male infertility in mice. PMCA4's partners in sperm and how its absence exerts its effect on fertility are unknown. We hypothesize that in sperm PMCA4 interacts with endothelial nitric oxide synthase (eNOS) and neuronal nitric oxide synthase (nNOS) which are rapidly activated by Ca(2+), and that these fertility-modulating proteins are present in prostasomes, which deliver them to sperm. We show that in human sperm PMCA4 is present on the acrosome, inner acrosomal membrane, posterior head, neck, midpiece and the proximal principal piece. PMCA4 localization showed inter- and intra-individual variation and was most abundant at the posterior head/neck junction, co-localizing with NOSs. Co-immunoprecipitations (Co-IP) revealed a close association of PMCA4 and the NOSs in Ca(2+) ionophore-treated sperm but much less so in uncapacitated untreated sperm. Fluorescence resonance energy transfer (FRET) showed a similar Ca(2+)-related association: PMCA4 and the NOSs are within 10 nm apart, and preferentially so in capacitated, compared with uncapacitated, sperm. FRET efficiencies varied, being significantly (P < 0.001) higher at high cytosolic Ca(2+) concentration ([Ca(2+)]c) in capacitated sperm than at low [Ca(2+)]c in uncapacitated sperm for the PMCA4-eNOS complex. These dynamic interactions were not seen for PMCA4-nNOS complexes, which had the highest FRET efficiencies. Further, along with Ca(2+)/CaM-dependent serine kinase (CASK), PMCA4 and the NOSs are present in the seminal plasma, specifically in prostasomes where Co-IP showed complexes similar to those in sperm. Finally, flow cytometry demonstrated that following co-incubation of sperm and seminal plasma, PMCA4 and the NOSs can be delivered in vitro to sperm via prostasomes. Our findings indicate that PMCA4 interacts simultaneously with the NOSs preferentially at high [Ca(2+)]c in sperm to down-regulate them, and thus prevent elevated levels of NO, known to induce asthenozoospermia via oxidative stress. Our studies point to the potential underlying cause of infertility in PMCA4's absence, and suggest that inactivating mutations of PMCA4 could lead to asthenozoospermia and human infertility. Screening for these mutations may serve both diagnostic and therapeutic purposes.
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Affiliation(s)
- Rachel E Andrews
- Department of Biological Sciences, University of Delaware, Newark, DE 17916, USA
| | - Deni S Galileo
- Department of Biological Sciences, University of Delaware, Newark, DE 17916, USA
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80
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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.
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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.
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81
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Diaz de Barboza G, Guizzardi S, Tolosa de Talamoni N. Molecular aspects of intestinal calcium absorption. World J Gastroenterol 2015; 21:7142-7154. [PMID: 26109800 PMCID: PMC4476875 DOI: 10.3748/wjg.v21.i23.7142] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 03/21/2015] [Accepted: 04/17/2015] [Indexed: 02/06/2023] Open
Abstract
Intestinal Ca2+ absorption is a crucial physiological process for maintaining bone mineralization and Ca2+ homeostasis. It occurs through the transcellular and paracellular pathways. The first route comprises 3 steps: the entrance of Ca2+ across the brush border membranes (BBM) of enterocytes through epithelial Ca2+ channels TRPV6, TRPV5, and Cav1.3; Ca2+ movement from the BBM to the basolateral membranes by binding proteins with high Ca2+ affinity (such as CB9k); and Ca2+ extrusion into the blood. Plasma membrane Ca2+ ATPase (PMCA1b) and sodium calcium exchanger (NCX1) are mainly involved in the exit of Ca2+ from enterocytes. A novel molecule, the 4.1R protein, seems to be a partner of PMCA1b, since both molecules co-localize and interact. The paracellular pathway consists of Ca2+ transport through transmembrane proteins of tight junction structures, such as claudins 2, 12, and 15. There is evidence of crosstalk between the transcellular and paracellular pathways in intestinal Ca2+ transport. When intestinal oxidative stress is triggered, there is a decrease in the expression of several molecules of both pathways that inhibit intestinal Ca2+ absorption. Normalization of redox status in the intestine with drugs such as quercetin, ursodeoxycholic acid, or melatonin return intestinal Ca2+ transport to control values. Calcitriol [1,25(OH)2D3] is the major controlling hormone of intestinal Ca2+ transport. It increases the gene and protein expression of most of the molecules involved in both pathways. PTH, thyroid hormones, estrogens, prolactin, growth hormone, and glucocorticoids apparently also regulate Ca2+ transport by direct action, indirect mechanism mediated by the increase of renal 1,25(OH)2D3 production, or both. Different physiological conditions, such as growth, pregnancy, lactation, and aging, adjust intestinal Ca2+ absorption according to Ca2+ demands. Better knowledge of the molecular details of intestinal Ca2+ absorption could lead to the development of nutritional and medical strategies for optimizing the efficiency of intestinal Ca2+ absorption and preventing osteoporosis and other pathologies related to Ca2+ metabolism.
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82
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Peralta-Arias RD, Vívenes CY, Camejo MI, Piñero S, Proverbio T, Martínez E, Marín R, Proverbio F. ATPases, ion exchangers and human sperm motility. Reproduction 2015; 149:475-84. [DOI: 10.1530/rep-14-0471] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Human sperm has several mechanisms to control its ionic milieu, such as the Na,K-ATPase (NKA), the Ca-ATPase of the plasma membrane (PMCA), the Na+/Ca2+-exchanger (NCX) and the Na+/H+-exchanger (NHE). On the other hand, the dynein-ATPase is the intracellular motor for sperm motility. In this work, we evaluated NKA, PMCA, NHE, NCX and dynein-ATPase activities in human sperm and investigated their correlation with sperm motility. Sperm motility was measured by Computer Assisted Semen Analysis. It was found that the NKA activity is inhibited by ouabain with twoKi(7.9×10−9and 9.8×10−5 M), which is consistent with the presence of two isoforms of α subunit of the NKA in the sperm plasma membranes (α1 and α4), being α4 more sensitive to ouabain. The decrease in NKA activity is associated with a reduction in sperm motility. In addition, sperm motility was evaluated in the presence of known inhibitors of NHE, PMCA and NCX, such as amiloride, eosin, and KB-R7943, respectively, as well as in the presence of nigericin after incubation with ouabain. Amiloride, eosin and KB-R7943 significantly reduced sperm motility. Nigericin reversed the effect of ouabain and amiloride on sperm motility. Dynein-ATPase activity was inhibited by acidic pH and micromolar concentrations of Ca2+. We explain our results in terms of inhibition of the dynein-ATPase in the presence of higher cytosolic H+and Ca2+, and therefore inhibition of sperm motility.
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83
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Panatala R, Hennrich H, Holthuis JCM. Inner workings and biological impact of phospholipid flippases. J Cell Sci 2015; 128:2021-32. [PMID: 25918123 DOI: 10.1242/jcs.102715] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The plasma membrane, trans-Golgi network and endosomal system of eukaryotic cells are populated with flippases that hydrolyze ATP to help establish asymmetric phospholipid distributions across the bilayer. Upholding phospholipid asymmetry is vital to a host of cellular processes, including membrane homeostasis, vesicle biogenesis, cell signaling, morphogenesis and migration. Consequently, defining the identity of flippases and their biological impact has been the subject of intense investigations. Recent work has revealed a remarkable degree of kinship between flippases and cation pumps. In this Commentary, we review emerging insights into how flippases work, how their activity is controlled according to cellular demands, and how disrupting flippase activity causes system failure of membrane function, culminating in membrane trafficking defects, aberrant signaling and disease.
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Affiliation(s)
- Radhakrishnan Panatala
- Department of Membrane Enzymology, Bijvoet Center and Institute of Biomembranes, Utrecht University, 3584 Utrecht, The Netherlands Molecular Cell Biology Division, University of Osnabrück, 49076 Osnabrück, Germany
| | - Hanka Hennrich
- Department of Membrane Enzymology, Bijvoet Center and Institute of Biomembranes, Utrecht University, 3584 Utrecht, The Netherlands
| | - Joost C M Holthuis
- Department of Membrane Enzymology, Bijvoet Center and Institute of Biomembranes, Utrecht University, 3584 Utrecht, The Netherlands Molecular Cell Biology Division, University of Osnabrück, 49076 Osnabrück, Germany
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84
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Evaluating the SERCA2 and VEGF mRNAs as Potential Molecular Biomarkers of the Onset and Progression in Huntington's Disease. PLoS One 2015; 10:e0125259. [PMID: 25915065 PMCID: PMC4411078 DOI: 10.1371/journal.pone.0125259] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 03/20/2015] [Indexed: 01/19/2023] Open
Abstract
Abnormalities of intracellular Ca2+ homeostasis and signalling as well as the down-regulation of neurotrophic factors in several areas of the central nervous system and in peripheral tissues are hallmarks of Huntington’s disease (HD). As there is no therapy for this hereditary, neurodegenerative fatal disease, further effort should be made to slow the progression of neurodegeneration in patients through the definition of early therapeutic interventions. For this purpose, molecular biomarker(s) for monitoring disease onset and/or progression and response to treatment need to be identified. In the attempt to contribute to the research of peripheral candidate biomarkers in HD, we adopted a multiplex real-time PCR approach to analyse the mRNA level of targeted genes involved in the control of cellular calcium homeostasis and in neuroprotection. For this purpose we recruited a total of 110 subjects possessing the HD mutation at different clinical stages of the disease and 54 sex- and age-matched controls. This study provides evidence of reduced transcript levels of sarco-endoplasmic reticulum-associated ATP2A2 calcium pump (SERCA2) and vascular endothelial growth factor (VEGF) in peripheral blood mononuclear cells (PBMCs) of manifest and pre-manifest HD subjects. Our results provide a potentially new candidate molecular biomarker for monitoring the progression of this disease and contribute to understanding some early events that might have a role in triggering cellular dysfunctions in HD.
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85
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Krebs J. The plethora of PMCA isoforms: Alternative splicing and differential expression. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1853:2018-24. [PMID: 25535949 DOI: 10.1016/j.bbamcr.2014.12.020] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Revised: 12/08/2014] [Accepted: 12/15/2014] [Indexed: 10/24/2022]
Abstract
In this review the four different genes of the mammalian plasma membrane calcium ATPase (PMCA) and their spliced isoforms are discussed with respect to their tissue distribution, their differences during development and their importance for regulating Ca²⁺ homeostasis under different conditions. This article is part of a Special Issue entitled: 13th European Symposium on Calcium.
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Affiliation(s)
- Joachim Krebs
- NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
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86
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de Juan-Sanz J, Núñez E, Zafra F, Berrocal M, Corbacho I, Ibáñez I, Arribas-González E, Marcos D, López-Corcuera B, Mata AM, Aragón C. Presynaptic control of glycine transporter 2 (GlyT2) by physical and functional association with plasma membrane Ca2+-ATPase (PMCA) and Na+-Ca2+ exchanger (NCX). J Biol Chem 2014; 289:34308-24. [PMID: 25315779 DOI: 10.1074/jbc.m114.586966] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Fast inhibitory glycinergic transmission occurs in spinal cord, brainstem, and retina to modulate the processing of motor and sensory information. After synaptic vesicle fusion, glycine is recovered back to the presynaptic terminal by the neuronal glycine transporter 2 (GlyT2) to maintain quantal glycine content in synaptic vesicles. The loss of presynaptic GlyT2 drastically impairs the refilling of glycinergic synaptic vesicles and severely disrupts neurotransmission. Indeed, mutations in the gene encoding GlyT2 are the main presynaptic cause of hyperekplexia in humans. Here, we show a novel endogenous regulatory mechanism that can modulate GlyT2 activity based on a compartmentalized interaction between GlyT2, neuronal plasma membrane Ca(2+)-ATPase (PMCA) isoforms 2 and 3, and Na(+)/Ca(2+)-exchanger 1 (NCX1). This GlyT2·PMCA2,3·NCX1 complex is found in lipid raft subdomains where GlyT2 has been previously found to be fully active. We show that endogenous PMCA and NCX activities are necessary for GlyT2 activity and that this modulation depends on lipid raft integrity. Besides, we propose a model in which GlyT2·PMCA2-3·NCX complex would help Na(+)/K(+)-ATPase in controlling local Na(+) increases derived from GlyT2 activity after neurotransmitter release.
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Affiliation(s)
- Jaime de Juan-Sanz
- From the Department of Biochemistry, Weill Cornell Medical College, New York, New York 10065
| | - Enrique Núñez
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
| | - Francisco Zafra
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
| | - María Berrocal
- the Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Ciencias, Universidad de Extremadura, 06006-Badajoz, Spain
| | - Isaac Corbacho
- the Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Ciencias, Universidad de Extremadura, 06006-Badajoz, Spain
| | - Ignacio Ibáñez
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
| | - Esther Arribas-González
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
| | - Daniel Marcos
- the Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Ciencias, Universidad de Extremadura, 06006-Badajoz, Spain
| | - Beatriz López-Corcuera
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
| | - Ana M Mata
- the Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Ciencias, Universidad de Extremadura, 06006-Badajoz, Spain
| | - Carmen Aragón
- the Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, 28049-Madrid, Spain, the Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, 46009-Valencia, Spain, the IdiPAZ-Hospital, Universitario La Paz, 28046-Madrid, Spain, and
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87
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Pandey KB, Rizvi SI. Role of resveratrol in regulation of membrane transporters and integrity of human erythrocytes. Biochem Biophys Res Commun 2014; 453:521-6. [PMID: 25285638 DOI: 10.1016/j.bbrc.2014.09.117] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 09/26/2014] [Indexed: 01/22/2023]
Abstract
An altered ion homeostasis due to impaired membrane transporters is known to be involved in the pathophysiology of many chronic diseases. Resveratrol, a phytoalexin, has been reported to elicit pleiotropic health-promoting effects, however, the mechanism(s) which underlie these effects remain speculative. The present study investigate the modulatory role of resveratrol on erythrocyte membrane Ca(2+)ATPase (PMCA pump), Na(+)/K(+)-ATPase (NKA pump), and Na(+)/H(+) exchanger (NHE) in control and experimental-oxidative stress conditions. Results suggest that resveratrol is a potent modulator of membrane transporters evidenced by stimulation of PMCA and NKA pumps and down-regulation of NHE. The observed effects on membrane transporters correlated with susceptibility of erythrocyte membrane to oxidative damage. The findings provide an insight into the role of membrane transporters and their involvement in the health beneficial effects of resveratrol.
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Affiliation(s)
| | - Syed Ibrahim Rizvi
- Department of Biochemistry, University of Allahabad, Allahabad 211002, India.
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88
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Plasma membrane Ca2+-ATPase isoforms composition regulates cellular pH homeostasis in differentiating PC12 cells in a manner dependent on cytosolic Ca2+ elevations. PLoS One 2014; 9:e102352. [PMID: 25014339 PMCID: PMC4094512 DOI: 10.1371/journal.pone.0102352] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 06/17/2014] [Indexed: 12/14/2022] Open
Abstract
Plasma membrane Ca2+-ATPase (PMCA) by extruding Ca2+ outside the cell, actively participates in the regulation of intracellular Ca2+ concentration. Acting as Ca2+/H+ counter-transporter, PMCA transports large quantities of protons which may affect organellar pH homeostasis. PMCA exists in four isoforms (PMCA1-4) but only PMCA2 and PMCA3, due to their unique localization and features, perform more specialized function. Using differentiated PC12 cells we assessed the role of PMCA2 and PMCA3 in the regulation of intracellular pH in steady-state conditions and during Ca2+ overload evoked by 59 mM KCl. We observed that manipulation in PMCA expression elevated pHmito and pHcyto but only in PMCA2-downregulated cells higher mitochondrial pH gradient (ΔpH) was found in steady-state conditions. Our data also demonstrated that PMCA2 or PMCA3 knock-down delayed Ca2+ clearance and partially attenuated cellular acidification during KCl-stimulated Ca2+ influx. Because SERCA and NCX modulated cellular pH response in neglectable manner, and all conditions used to inhibit PMCA prevented KCl-induced pH drop, we considered PMCA2 and PMCA3 as mainly responsible for transport of protons to intracellular milieu. In steady-state conditions, higher TMRE uptake in PMCA2-knockdown line was driven by plasma membrane potential (Ψp). Nonetheless, mitochondrial membrane potential (Ψm) in this line was dissipated during Ca2+ overload. Cyclosporin and bongkrekic acid prevented Ψm loss suggesting the involvement of Ca2+-driven opening of mitochondrial permeability transition pore as putative underlying mechanism. The findings presented here demonstrate a crucial role of PMCA2 and PMCA3 in regulation of cellular pH and indicate PMCA membrane composition important for preservation of electrochemical gradient.
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89
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PB1-F2 attenuates virulence of highly pathogenic avian H5N1 influenza virus in chickens. PLoS One 2014; 9:e100679. [PMID: 24959667 PMCID: PMC4069075 DOI: 10.1371/journal.pone.0100679] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 05/30/2014] [Indexed: 01/08/2023] Open
Abstract
Highly pathogenic avian influenza virus (HPAIV) is a permanent threat due to its capacity to cross species barriers and generate severe infections and high mortality in humans. Recent findings have highlighted the potential role of PB1-F2, a small accessory influenza protein, in the pathogenesis process mediated by HPAIV in mammals. In this study, using a recombinant H5N1 HPAIV (wt) and its PB1-F2-deleted mutant (ΔF2), we studied the effects of PB1-F2 in a chicken model. Unexpectedly, when using low inoculation dose we observed that the wt-infected chickens had a higher survival rate than the ΔF2-infected chickens, a feature that contrasts with what is usually observed in mammals. High inoculation dose had similar mortality rate for both viruses, and comparison of the bio-distribution of the two viruses indicated that the expression of PB1-F2 allows a better spreading of the virus within chicken embryos. Transcriptomic profiles of lungs and blood cells were characterized at two days post-infection in chickens inoculated with the wild type (wt) or the ΔF2 mutant viruses. In lungs, the expression of PB1-F2 during the infection induced pathways related to calcium signaling and repressed a large panel of immunological functions. In blood cells, PB1-F2 was associated with a gene signature specific for mitochondrial dysfunction and down-modulated leucocytes activation. Finally we compared the effect of PB1-F2 in lungs of chickens and mice. We identified that gene signature associated to tissue damages is a PB1-F2 feature shared by the two species; by contrast, the early inhibition of immune response mediated by PB1-F2 observed in chickens is not seen in mice. In summary, our data suggest that PB1-F2 expression deeply affect the immune response in chickens in a way that may attenuate pathogenicity at low infection dose, a feature differing from what was previously observed in mammal species.
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90
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Kosiorek M, Podszywalow-Bartnicka P, Zylinska L, Pikula S. NFAT1 and NFAT3 cooperate with HDAC4 during regulation of alternative splicing of PMCA isoforms in PC12 cells. PLoS One 2014; 9:e99118. [PMID: 24905014 PMCID: PMC4048221 DOI: 10.1371/journal.pone.0099118] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 05/10/2014] [Indexed: 02/07/2023] Open
Abstract
Background The bulk of human genes undergo alternative splicing (AS) upon response to physiological stimuli. AS is a great source of protein diversity and biological processes and is associated with the development of many diseases. Pheochromocytoma is a neuroendocrine tumor, characterized by an excessive Ca2+-dependent secretion of catecholamines. This underlines the importance of balanced control of calcium transport via regulation of gene expression pattern, including different calcium transport systems, such as plasma membrane Ca2+-ATPases (PMCAs), abundantly expressed in pheochromocytoma chromaffin cells (PC12 cells). PMCAs are encoded by four genes (Atp2b1, Atp2b2, Atp2b3, Atp2b4), whose transcript products undergo alternative splicing giving almost 30 variants. Results In this scientific report, we propose a novel mechanism of regulation of PMCA alternative splicing in PC12 cells through cooperation of the nuclear factor of activated T-cells (NFAT) and histone deacetylases (HDACs). Luciferase assays showed increased activity of NFAT in PC12 cells, which was associated with altered expression of PMCA. RT-PCR experiments suggested that inhibition of the transcriptional activity of NFAT might result in the rearrangement of PMCA splicing variants in PC12 cells. NFAT inhibition led to dominant expression of 2x/c, 3x/a and 4x/a PMCA variants, while in untreated cells the 2w,z/b, 3z,x/b,c,e,f, and 4x/b variants were found as well. Furthermore, chromatin immunoprecipitation experiments showed that NFAT1-HDAC4 or NFAT3-HDAC4 complexes might be involved in regulation of PMCA2x splicing variant generation. Conclusions We suggest that the influence of NFAT/HDAC on PMCA isoform composition might be important for altered dopamine secretion by PC12 cells.
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Affiliation(s)
- Michalina Kosiorek
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
- Department of Neurodegenerative Disorders, Laboratory of Neurogenetics, Mossakowski Medical Research Centre PAS, Warsaw, Poland
| | | | - Ludmila Zylinska
- Department of Molecular Neurochemistry, Medical University, Lodz, Poland
| | - Slawomir Pikula
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
- * E-mail:
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91
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Abstract
PURPOSE OF REVIEW Novel high-throughput genetic techniques have increased the pace of discoveries in the field of primary aldosteronism. Mutations in the potassium channel gene KCNJ5 are a cause of familial and sporadic forms of primary aldosteronism with around 30-40% of aldosterone-producing adenomas being affected by somatic mutations. RECENT FINDINGS Exome sequencing of tumors without KCNJ5 mutations revealed genetic alterations in the ATPases ATP1A1 and ATP2B3, with a combined prevalence of 5-7%. Mutations in the gene encoding a subunit of the Ca channel Cav1.3 (CACNA1D) were described with a prevalence of 5-8%. In addition, a new syndrome consisting of primary aldosteronism, seizures, and neuromuscular disease with germline CACNA1D mutations could be identified. All these genetic variants enhance Ca-mediated signalling and steroidogenesis in affected glomerulosa cells and provide the molecular basis for autonomous aldosterone secretion. Furthermore, the pattern of genetic alterations allows for subgrouping of patient cohorts with potentially distinct clinical features including sex and age distribution as well as endocrine and cardiovascular endpoints. SUMMARY Altogether in around 50% of aldosterone-producing adenomas, a somatic point mutation can be identified as the underlying genetic cause. These findings will provide the framework for potential identification of new biomarkers and therapeutic targets of this most common form of secondary hypertension.
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Affiliation(s)
- Evelyn Fischer
- Medizinische Klinik und Poliklinik IV, Klinikum der Ludwig-Maximilians-Universität München, Munich, Germany
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92
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Billaud M, Lohman AW, Johnstone SR, Biwer LA, Mutchler S, Isakson BE. Regulation of cellular communication by signaling microdomains in the blood vessel wall. Pharmacol Rev 2014; 66:513-69. [PMID: 24671377 DOI: 10.1124/pr.112.007351] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
It has become increasingly clear that the accumulation of proteins in specific regions of the plasma membrane can facilitate cellular communication. These regions, termed signaling microdomains, are found throughout the blood vessel wall where cellular communication, both within and between cell types, must be tightly regulated to maintain proper vascular function. We will define a cellular signaling microdomain and apply this definition to the plethora of means by which cellular communication has been hypothesized to occur in the blood vessel wall. To that end, we make a case for three broad areas of cellular communication where signaling microdomains could play an important role: 1) paracrine release of free radicals and gaseous molecules such as nitric oxide and reactive oxygen species; 2) role of ion channels including gap junctions and potassium channels, especially those associated with the endothelium-derived hyperpolarization mediated signaling, and lastly, 3) mechanism of exocytosis that has considerable oversight by signaling microdomains, especially those associated with the release of von Willebrand factor. When summed, we believe that it is clear that the organization and regulation of signaling microdomains is an essential component to vessel wall function.
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Affiliation(s)
- Marie Billaud
- Dept. of Molecular Physiology and Biophysics, University of Virginia School of Medicine, PO Box 801394, Charlottesville, VA 22902.
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93
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Ewart MA, Kennedy S, Macmillan D, Raja ALN, Watt IM, Currie S. Altered vascular smooth muscle function in the ApoE knockout mouse during the progression of atherosclerosis. Atherosclerosis 2014; 234:154-61. [PMID: 24657385 PMCID: PMC3997800 DOI: 10.1016/j.atherosclerosis.2014.02.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 01/29/2014] [Accepted: 02/18/2014] [Indexed: 02/07/2023]
Abstract
Objectives Relaxation of vascular smooth muscle (VSM) requires re-uptake of cytosolic Ca2+ into the sarcoplasmic reticulum (SR) via the Sarco/Endoplasmic Reticulum Ca2+ ATPase (SERCA), or extrusion via the Plasma Membrane Ca2+ ATPase (PMCA) or sodium Ca2+ exchanger (NCX). Peroxynitrite, a reactive species formed in vascular inflammatory diseases, upregulates SERCA activity to induce relaxation but, chronically, can contribute to atherogenesis and altered vascular function by escalating endoplasmic reticulum stress. Our objectives were to determine if peroxynitrite-induced relaxation and Ca2+ handling processes within vascular smooth muscle cells were altered as atherosclerosis develops. Methods Aortae from control and ApoE−/− mice were studied histologically, functionally and for protein expression levels of SERCA and PMCA. Ca2+ responses were assessed in dissociated aortic smooth muscle cells in the presence and absence of extracellular Ca2+. Results Relaxation to peroxynitrite was concentration-dependent and endothelium-independent. The abilities of the SERCA blocker thapsigargin and the PMCA inhibitor carboxyeosin to block this relaxation were altered during fat feeding and plaque progression. SERCA levels were progressively reduced, while PMCA expression was upregulated. In ApoE−/− VSM cells, increases in cytosolic Ca2+ [Ca2+]c in response to SERCA blockade were reduced, while SERCA-independent Ca2+ clearance was faster compared to control. Conclusion As atherosclerosis develops in the ApoE−/− mouse, expression and function of Ca2+ handling proteins are altered. Up-regulation of Ca2+ removal via PMCA may offer a potential compensatory mechanism to help normalise the dysfunctional relaxation observed during disease progression. Expression and function of SERCA and PMCA are temporally altered in ApoE−/− VSM. TG-induced increases in [Ca2+]c were reduced in ApoE−/− aortic SM cells. Ca2+ extrusion is upregulated in isolated ApoE−/− aortic SM cells.
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Affiliation(s)
- Marie-Ann Ewart
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, G12 8QQ, UK.
| | - Simon Kennedy
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, G12 8QQ, UK
| | - Debbi Macmillan
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, Glasgow G4 0NR, UK
| | - Abhirami L N Raja
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, G12 8QQ, UK
| | - Ian M Watt
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, G12 8QQ, UK
| | - Susan Currie
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, Glasgow G4 0NR, UK
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94
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Mazzitelli LR, Adamo HP. Hyperactivation of the human plasma membrane Ca2+ pump PMCA h4xb by mutation of Glu99 to Lys. J Biol Chem 2014; 289:10761-10768. [PMID: 24584935 DOI: 10.1074/jbc.m113.535583] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The transport of calcium to the extracellular space carried out by plasma membrane Ca(2+) pumps (PMCAs) is essential for maintaining low Ca(2+) concentrations in the cytosol of eukaryotic cells. The activity of PMCAs is controlled by autoinhibition. Autoinhibition is relieved by the binding of Ca(2+)-calmodulin to the calmodulin-binding autoinhibitory sequence, which in the human PMCA is located in the C-terminal segment and results in a PMCA of high maximal velocity of transport and high affinity for Ca(2+). Autoinhibition involves the intramolecular interaction between the autoinhibitory domain and a not well defined region of the molecule near the catalytic site. Here we show that the fusion of GFP to the C terminus of the h4xb PMCA causes partial loss of autoinhibition by specifically increasing the Vmax. Mutation of residue Glu(99) to Lys in the cytosolic portion of the M1 transmembrane helix at the other end of the molecule brought the Vmax of the h4xb PMCA to near that of the calmodulin-activated enzyme without increasing the apparent affinity for Ca(2+). Altogether, the results suggest that the autoinhibitory interaction of the extreme C-terminal segment of the h4 PMCA is disturbed by changes of negatively charged residues of the N-terminal region. This would be consistent with a recently proposed model of an autoinhibited form of the plant ACA8 pump, although some differences are noted.
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Affiliation(s)
- Luciana R Mazzitelli
- Instituto de Química y Fisicoquímica Biológicas-Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
| | - Hugo P Adamo
- Instituto de Química y Fisicoquímica Biológicas-Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina.
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95
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Dias J, Ferrão FM, Axelband F, Carmona AK, Lara LS, Vieyra A. ANG-(3-4) inhibits renal Na+-ATPase in hypertensive rats through a mechanism that involves dissociation of ANG II receptors, heterodimers, and PKA. Am J Physiol Renal Physiol 2014; 306:F855-63. [PMID: 24523384 DOI: 10.1152/ajprenal.00488.2013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The physiological roles of ANG-(3-4) (Val-Tyr), a potent ANG II-derived peptide, remain largely unknown. The present study 1)investigates whether ANG-(3-4) modulates ouabain-resistant Na(+)-ATPase resident in proximal tubule cells and 2) verifies whether its possible action on pumping activity, considered the fine tuner of Na(+) reabsorption in this nephron segment, depends on blood pressure. ANG-(3-4) inhibited Na(+)-ATPase activity in membranes of spontaneously hypertensive rats (SHR) at nanomolar concentrations, with no effect in Wistar-Kyoto (WKY) rats or on Na(+)-K(+)-ATPase. PD123319 (10(-7) M) and PKA(5-24) (10(-6) M), an AT2 receptor (AT2R) antagonist and a specific PKA inhibitor, respectively, abrogated this inhibition, indicating that AT2R and PKA are central in this pathway. Despite the lack of effect of ANG-(3-4) when assayed alone in WKY rats, the peptide (10(-8) M) completely blocked stimulation of Na(+)-ATPase induced by 10(-10) M ANG II in normotensive rats through a mechanism that also involves AT2R and PKA. Tubular membranes from WKY rats had higher levels of AT2R/AT1R heterodimers, which remain associated in 10(-10) M ANG II and dissociate to a very low dimerization state upon addition of 10(-8) M ANG-(3-4). This lower level of heterodimers was that found in SHR, and heterodimers did not dissociate when the same concentration of ANG-(3-4) was present. Oral administration of ANG-(3-4) (50 mg/kg body mass) increased urinary Na(+) concentration and urinary Na(+) excretion with a simultaneous decrease in systolic arterial pressure in SHR, but not in WKY rats. Thus the influence of ANG-(3-4) on Na(+) transport and its hypotensive action depend on receptor association and on blood pressure.
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Affiliation(s)
- Juliana Dias
- Carlos Chagas Filho Institute of Biophysics, Federal Univ. of Rio de Janeiro and National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro 21941-902, Brazil.
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96
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Abstract
BACKGROUND Recent genome-wide association studies (GWASs) have identified 30 genetic loci that regulate blood pressure, increasing our understanding of the cause of hypertension. However, it has been difficult to define the causative genes at these loci due to a lack of functional analyses. METHOD In this study, we aimed to validate the candidate gene ATP2B1 in 12q21, variants near which have the strongest association with blood pressure in Asians and Europeans. ATP2B1 functions as a calcium pump to fine-tune calcium concentrations - necessary for repolarization following muscular contractions. We silenced Atp2b1 using an siRNA complex, injected into mouse tail veins. RESULTS In treated mice, blood pressure rose and the mesenteric arteries increased in wall : lumen ratio. Moreover, the arteries showed enhanced myogenic responses to pressure, and contractile responses to phenylephrine increased compared with the control, suggesting that blood pressure is regulated by ATP2B1 through the contraction and dilation of the vessel, likely by controlling calcium concentrations in the resting state. CONCLUSION These results support that ATP2B1 is the causative gene in the blood pressure-associated 12q21 locus and demonstrate that ATP2B1 expression in the vessel influences blood pressure.
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97
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Dutta RK, Welander J, Brauckhoff M, Walz M, Alesina P, Arnesen T, Söderkvist P, Gimm O. Complementary somatic mutations of KCNJ5, ATP1A1, and ATP2B3 in sporadic aldosterone producing adrenal adenomas. Endocr Relat Cancer 2014; 21:L1-4. [PMID: 24179102 DOI: 10.1530/erc-13-0466] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ravi Kumar Dutta
- Department of Clinical and Experimental Medicine, Faculty of Health Sciences Linköping University, SE-58183, Linköping Sweden Department of Surgery Haukeland University Hospital, Bergen Norway Department of Surgical Sciences Institute of Medicine, University of Bergen, Bergen Norway Klinik für Chirurgie and Zentrum für Minimal Invasive Chirurgie, Klinikum Essen-Mitte, Essen Germany Department of Molecular Biology Institute of Medicine, University of Bergen, Bergen Norway Department of Clinical Genetics County Council of Östergötland, Linköping Sweden Department of Surgery County Council of Östergötland, Linköping Sweden
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98
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Histone deacetylase inhibitor- and PMA-induced upregulation of PMCA4b enhances Ca2+ clearance from MCF-7 breast cancer cells. Cell Calcium 2014; 55:78-92. [DOI: 10.1016/j.ceca.2013.12.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 12/18/2013] [Accepted: 12/21/2013] [Indexed: 11/23/2022]
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99
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Jiang L, Bechtel MD, Bean JL, Winefield R, Williams TD, Zaidi A, Michaelis EK, Michaelis ML. Effects of gangliosides on the activity of the plasma membrane Ca2+-ATPase. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1255-65. [PMID: 24434060 DOI: 10.1016/j.bbamem.2014.01.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 01/04/2014] [Accepted: 01/06/2014] [Indexed: 02/03/2023]
Abstract
Control of intracellular calcium concentrations ([Ca(2+)]i) is essential for neuronal function, and the plasma membrane Ca(2+)-ATPase (PMCA) is crucial for the maintenance of low [Ca(2+)]i. We previously reported on loss of PMCA activity in brain synaptic membranes during aging. Gangliosides are known to modulate Ca(2+) homeostasis and signal transduction in neurons. In the present study, we observed age-related changes in the ganglioside composition of synaptic plasma membranes. This led us to hypothesize that alterations in ganglioside species might contribute to the age-associated loss of PMCA activity. To probe the relationship between changes in endogenous ganglioside content or composition and PMCA activity in membranes of cortical neurons, we induced depletion of gangliosides by treating neurons with d-threo-1-phenyl-2-decanoylamino-3-morpholino-1-propanol (d-PDMP). This caused a marked decrease in the activity of PMCA, which suggested a direct correlation between ganglioside content and PMCA activity. Neurons treated with neuraminidase exhibited an increase in GM1 content, a loss in poly-sialoganglioside content, and a decrease in PMCA activity that was greater than that produced by d-PDMP treatment. Thus, it appeared that poly-sialogangliosides had a stimulatory effect whereas mono-sialogangliosides had the opposite effect. Our observations add support to previous reports of PMCA regulation by gangliosides by demonstrating that manipulations of endogenous ganglioside content and species affect the activity of PMCA in neuronal membranes. Furthermore, our studies suggest that age-associated loss in PMCA activity may result in part from changes in the lipid environment of this Ca(2+) transporter.
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Affiliation(s)
- Lei Jiang
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS, USA; Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA.
| | - Misty D Bechtel
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS, USA; Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA
| | - Jennifer L Bean
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA; Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS, USA
| | - Robert Winefield
- Structural Biology Center, University of Kansas, Lawrence, KS, USA
| | - Todd D Williams
- Structural Biology Center, University of Kansas, Lawrence, KS, USA
| | - Asma Zaidi
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS, USA; Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA; Department of Biochemistry, Kansas City University of Medicine and Biosciences, Kansas City, MO, USA
| | - Elias K Michaelis
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS, USA; Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA
| | - Mary L Michaelis
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS, USA; Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA
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100
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Marques R, Maia CJ, Vaz C, Correia S, Socorro S. The diverse roles of calcium-binding protein regucalcin in cell biology: from tissue expression and signalling to disease. Cell Mol Life Sci 2014; 71:93-111. [PMID: 23519827 PMCID: PMC11113322 DOI: 10.1007/s00018-013-1323-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 02/21/2013] [Accepted: 03/07/2013] [Indexed: 02/06/2023]
Abstract
Regucalcin (RGN) is a calcium (Ca(2+))-binding protein widely expressed in vertebrate and invertebrate species, which is also known as senescence marker protein 30, due to its molecular weight (33 kDa) and a characteristically diminished expression with the aging process. RGN regulates intracellular Ca(2+) homeostasis and the activity of several proteins involved in intracellular signalling pathways, namely, kinases, phosphatases, phosphodiesterase, nitric oxide synthase and proteases, which highlights its importance in cell biology. In addition, RGN has cytoprotective effects reducing intracellular levels of oxidative stress, also playing a role in the control of cell survival and apoptosis. Multiple factors have been identified regulating the cell levels of RGN transcripts and protein, and an altered expression pattern of this interesting protein has been found in cases of reproductive disorders, neurodegenerative diseases and cancer. Moreover, RGN is a serum-secreted protein, and its levels have been correlated with the stage of disease, which strongly suggests the usefulness of this protein as a potential biomarker for monitoring disease onset and progression. The present review aims to discuss the available information concerning RGN expression and function in distinct cell types and tissues, integrating cellular and molecular mechanisms in the context of normal and pathological conditions. Insight into the cellular actions of RGN will be a key step towards deepening the knowledge of the biology of several human diseases.
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Affiliation(s)
- Ricardo Marques
- CICS-UBI, Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Cláudio J. Maia
- CICS-UBI, Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Cátia Vaz
- CICS-UBI, Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Sara Correia
- CICS-UBI, Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
| | - Sílvia Socorro
- CICS-UBI, Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
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