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Rosa A, Pinna I, Masala C. Role of body weight and sex in the olfactory and gustatory pleasantness, intensity, and familiarity of a lipid‐rich food. J SENS STUD 2022. [DOI: 10.1111/joss.12739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Antonella Rosa
- Department of Biomedical Sciences University of Cagliari, Cittadella Universitaria Cagliari Italy
| | - Ilenia Pinna
- Department of Biomedical Sciences University of Cagliari, Cittadella Universitaria Cagliari Italy
| | - Carla Masala
- Department of Biomedical Sciences University of Cagliari, Cittadella Universitaria Cagliari Italy
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2
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Onogi Y, Khalil AEMM, Ussar S. Identification and characterization of adipose surface epitopes. Biochem J 2020; 477:2509-2541. [PMID: 32648930 PMCID: PMC7360119 DOI: 10.1042/bcj20190462] [Citation(s) in RCA: 8] [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: 02/10/2020] [Revised: 06/11/2020] [Accepted: 06/12/2020] [Indexed: 12/14/2022]
Abstract
Adipose tissue is a central regulator of metabolism and an important pharmacological target to treat the metabolic consequences of obesity, such as insulin resistance and dyslipidemia. Among the various cellular compartments, the adipocyte cell surface is especially appealing as a drug target as it contains various proteins that when activated or inhibited promote adipocyte health, change its endocrine function and eventually maintain or restore whole-body insulin sensitivity. In addition, cell surface proteins are readily accessible by various drug classes. However, targeting individual cell surface proteins in adipocytes has been difficult due to important functions of these proteins outside adipose tissue, raising various safety concerns. Thus, one of the biggest challenges is the lack of adipose selective surface proteins and/or targeting reagents. Here, we discuss several receptor families with an important function in adipogenesis and mature adipocytes to highlight the complexity at the cell surface and illustrate the problems with identifying adipose selective proteins. We then discuss that, while no unique adipocyte surface protein might exist, how splicing, posttranslational modifications as well as protein/protein interactions can create enormous diversity at the cell surface that vastly expands the space of potentially unique epitopes and how these selective epitopes can be identified and targeted.
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Affiliation(s)
- Yasuhiro Onogi
- RG Adipocytes and Metabolism, Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, 85764 Neuherberg, Germany
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany
| | - Ahmed Elagamy Mohamed Mahmoud Khalil
- RG Adipocytes and Metabolism, Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, 85764 Neuherberg, Germany
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany
| | - Siegfried Ussar
- RG Adipocytes and Metabolism, Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, 85764 Neuherberg, Germany
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany
- Department of Medicine, Technische Universität München, Munich, Germany
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3
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Wu L, Song Y, Zhang Y, Liang B, Deng Y, Tang T, Ye YC, Hou HY, Wang CC. Novel Genetic Variants of PPARγ2 Promoter in Gestational Diabetes Mellitus and its Molecular Regulation in Adipogenesis. Front Endocrinol (Lausanne) 2020; 11:499788. [PMID: 33551986 PMCID: PMC7862745 DOI: 10.3389/fendo.2020.499788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 11/25/2020] [Indexed: 11/13/2022] Open
Abstract
Peroxisome proliferator-activated receptor γ2 (PPARγ2) is a nuclear hormone receptor of ligand-dependent transcription factor with a key role in adipogenesis and insulin sensitization in diabetes mellitus. In this study, we investigated genetic variants in PPARγ2 promoter, its association with gestational diabetes mellitus (GDM), and its molecular regulation. PPARγ2 promoter and start codon (-2,091 to +82 bp) from 400 pregnancies with GDM and 400 gestational-age matched control pregnancies were sequenced. Association and linkage disequilibrium of the identified polymorphisms with GDM was determined. ChIP-seq, gene silencing, and dual-luciferase reporter assays were performed to confirm transcription factor binding sites and promoter activity of the variants. Transfection experiments were carried out to determine the effects of variants on gene expression and adipogenesis. Among 15 variants identified, 7 known variants were not significantly associated with the risk of GDM (odds ratio: 0.710-1.208, 95% confidence interval: 0.445-0.877 to 1.132-1.664, P > 0.05) while linkage disequilibrium was significant (D' > 0.7, R2 > 0.9). However, T-A-A-T-G haplotype was not significantly associated with GDM (χ2 = 2.461, P = 0.117). Five rare variants and 3 novel variants (rs948820149, rs1553638909, and rs1553638903) were only found in GDM. Transcription factor glucocorticoid receptor β (GRβ) bound to -807A/C (rs948820149) and knockdown of GRβ suppressed PPARγ2 promoter activity. This mutation significantly down-regulated PPARγ2 expression and alleviated adipogenesis. In conclusion, a novel -807A/C in PPARγ2 promoter was identified in Chinese women with GDM and the mutation affected GRβ binding and transcription of PPARγ2 for adipogenesis.
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Affiliation(s)
- Ling Wu
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Yi Song
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Yuan Zhang
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Bo Liang
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Yan Deng
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Tao Tang
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Yan Chou Ye
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Hong Ying Hou
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Chi Chiu Wang
- Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, Hong Kong
- Development and Reproduction Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
- Chinese University of Hong Kong-Sichuan University Joint Laboratory in Reproductive Medicine, The Chinese University of Hong Kong, Hong Kong, Hong Kong
- *Correspondence: Chi Chiu Wang,
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4
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Ayad O, Magaud C, Sebille S, Bescond J, Mimbimi C, Cognard C, Faivre JF, Bois P, Chatelier A. Functional BKCa channel in human resident cardiac stem cells expressing W8B2. FEBS J 2017; 285:518-530. [PMID: 29211342 DOI: 10.1111/febs.14352] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 11/02/2017] [Accepted: 11/30/2017] [Indexed: 01/24/2023]
Abstract
Recently, a new population of resident cardiac stem cells (CSCs) positive for the W8B2 marker has been identified. These CSCs are considered to be an ideal cellular source to repair myocardial damage after infarction. However, the electrophysiological profile of these cells has not been characterized yet. We first establish the conditions of isolation and expansion of W8B2+ CSCs from human heart biopsies using a magnetic sorting system followed by flow cytometry cell sorting. These cells display a spindle-shaped morphology, are highly proliferative, and possess self-renewal capacity demonstrated by their ability to form colonies. Besides, W8B2+ CSCs are positive for mesenchymal markers but negative for hematopoietic and endothelial ones. RT-qPCR and immunostaining experiments show that W8B2+ CSCs express some early cardiac-specific transcription factors but lack the expression of cardiac-specific structural genes. Using patch clamp in the whole-cell configuration, we show for the first time the electrophysiological signature of BKCa current in these cells. Accordingly, RT-PCR and western blotting analysis confirmed the presence of BKCa at both mRNA and protein levels in W8B2+ CSCs. Interestingly, BKCa channel inhibition by paxilline decreased cell proliferation in a concentration-dependent manner and halted cell cycle progression at the G0/G1 phase. The inhibition of BKCa also decreased the self-renewal capacity but did not affect migration of W8B2+ CSCs. Taken together, our results are consistent with an important role of BKCa channels in cell cycle progression and self-renewal in human cardiac stem cells.
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Affiliation(s)
- Oualid Ayad
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Christophe Magaud
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Stéphane Sebille
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Jocelyn Bescond
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Chloé Mimbimi
- Service de chirurgie cardio-thoracique, CHU Poitiers, France
| | - Christian Cognard
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Jean-Francois Faivre
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Patrick Bois
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
| | - Aurelien Chatelier
- Equipe Transferts Ioniques et Rythmicité Cardiaque, Laboratoire Signalisation et Transports Ioniques Membranaires, CNRS ERL 7368, EA 7349, Université de Poitiers, France
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Halm ST, Bottomley MA, Almutairi MM, Di Fulvio M, Halm DR. Survival and growth of C57BL/6J mice lacking the BK channel, Kcnma1: lower adult body weight occurs together with higher body fat. Physiol Rep 2017; 5:5/4/e13137. [PMID: 28242822 PMCID: PMC5328773 DOI: 10.14814/phy2.13137] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 12/23/2016] [Accepted: 01/02/2017] [Indexed: 11/29/2022] Open
Abstract
Big conductance potassium (BK) channels contribute to K+ flow and electrical behavior in many cell types. Mice made null for the gene (Kcnma1) producing the BK channel (BKKO) exhibit numerous deficits in physiological functions. Breeding mice lacking a single allele of Kcnma1 (C57BL/6J background) had litter sizes of approximately eight pups. For the period of maternal care (P0–P21), pup deaths peaked at P1 with a second less severe interval of death peaking near P13. Early deaths were twice as likely during a 20‐month period of building construction compared with the quiescent period after cessation of construction. Births during construction were not consistent with Mendelian predictions indicating the likelihood of a specific disadvantage induced by this environmental stressor. Later BKKO pup deaths (~P13) also were more numerous than Mendelian expectations. After weaning, weight gain was slower for BKKO mice compared with wild‐type littermates: 5 g less for male BKKO mice and 4 g less for female BKKO mice. Body composition determined by quantitative magnetic resonance indicated a higher fat proportion for wild‐type female mice compared with males, as well as a higher hydration ratio. Both male and female BKKO mice showed higher fat proportions than wild‐type, with female BKKO mice exhibiting greater variation. Together, these results indicate that BKKO mice suffered disadvantages that lead to prenatal and perinatal death. A metabolic difference likely related to glucose handling led to the smaller body size and distinct composition for BKKO mice, suggesting a diversion of energy supplies from growth to fat storage.
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Affiliation(s)
- Susan T Halm
- Department of Neuroscience, Cell Biology and Physiology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
| | - Michael A Bottomley
- Department of Mathematics and Statistics, Statistical Consulting Center, Wright State University, Dayton, Ohio
| | - Mohammed M Almutairi
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
| | - Maurico Di Fulvio
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
| | - Dan R Halm
- Department of Neuroscience, Cell Biology and Physiology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
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Illison J, Tian L, McClafferty H, Werno M, Chamberlain LH, Leiss V, Sassmann A, Offermanns S, Ruth P, Shipston MJ, Lukowski R. Obesogenic and Diabetogenic Effects of High-Calorie Nutrition Require Adipocyte BK Channels. Diabetes 2016; 65:3621-3635. [PMID: 27605626 DOI: 10.2337/db16-0245] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 08/16/2016] [Indexed: 11/13/2022]
Abstract
Elevated adipose tissue expression of the Ca2+- and voltage-activated K+ (BK) channel was identified in morbidly obese men carrying a BK gene variant, supporting the hypothesis that K+ channels affect the metabolic responses of fat cells to nutrients. To establish the role of endogenous BKs in fat cell maturation, storage of excess dietary fat, and body weight (BW) gain, we studied a gene-targeted mouse model with global ablation of the BK channel (BKL1/L1) and adipocyte-specific BK-deficient (adipoqBKL1/L2) mice. Global BK deficiency afforded protection from BW gain and excessive fat accumulation induced by a high-fat diet (HFD). Expansion of white adipose tissue-derived epididymal BKL1/L1 preadipocytes and their differentiation to lipid-filled mature adipocytes in vitro, however, were improved. Moreover, BW gain and total fat masses of usually superobese ob/ob mice were significantly attenuated in the absence of BK, together supporting a central or peripheral role for BKs in the regulatory system that controls adipose tissue and weight. Accordingly, HFD-fed adipoqBKL1/L2 mutant mice presented with a reduced total BW and overall body fat mass, smaller adipocytes, and reduced leptin levels. Protection from pathological weight gain in the absence of adipocyte BKs was beneficial for glucose handling and related to an increase in body core temperature as a result of higher levels of uncoupling protein 1 and a low abundance of the proinflammatory interleukin-6, a common risk factor for diabetes and metabolic abnormalities. This suggests that adipocyte BK activity is at least partially responsible for excessive BW gain under high-calorie conditions, suggesting that BK channels are promising drug targets for pharmacotherapy of metabolic disorders and obesity.
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Affiliation(s)
- Julia Illison
- Pharmakologie, Toxikologie und Klinische Pharmazie, Institut für Pharmazie, Tübingen, Germany
| | - Lijun Tian
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, U.K
| | - Heather McClafferty
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, U.K
| | - Martin Werno
- Strathclyde Institute of Pharmacy and Biomedical Sciences, Strathclyde University, Glasgow, U.K
| | - Luke H Chamberlain
- Strathclyde Institute of Pharmacy and Biomedical Sciences, Strathclyde University, Glasgow, U.K
| | - Veronika Leiss
- Department of Pharmacology and Experimental Therapy, Institute of Experimental and Clinical Pharmacology and Toxicology, University Hospital Tübingen, Tübingen, Germany
| | - Antonia Sassmann
- Department of Pharmacology, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Stefan Offermanns
- Department of Pharmacology, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Peter Ruth
- Pharmakologie, Toxikologie und Klinische Pharmazie, Institut für Pharmazie, Tübingen, Germany
| | - Michael J Shipston
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, U.K
| | - Robert Lukowski
- Pharmakologie, Toxikologie und Klinische Pharmazie, Institut für Pharmazie, Tübingen, Germany
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7
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Vasconcelos LHC, Souza ILL, Pinheiro LS, Silva BA. Ion Channels in Obesity: Pathophysiology and Potential Therapeutic Targets. Front Pharmacol 2016; 7:58. [PMID: 27065858 PMCID: PMC4811910 DOI: 10.3389/fphar.2016.00058] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 02/29/2016] [Indexed: 01/29/2023] Open
Abstract
Obesity is a multifactorial disease related to metabolic disorders and associated with genetic determinants. Currently, ion channels activity has been linked to many of these disorders, in addition to the central regulation of food intake, energetic balance, hormone release and response, as well as the adipocyte cell proliferation. Therefore, the objective of this work is to review the current knowledge about the influence of ion channels in obesity development. This review used different sources of literature (Google Scholar, PubMed, Scopus, and Web of Science) to assess the role of ion channels in the pathophysiology of obesity. Ion channels present diverse key functions, such as the maintenance of physiological homeostasis and cell proliferation. Cell biology and pharmacological experimental evidences demonstrate that proliferating cells exhibit ion channel expression, conductance, and electrical properties different from the resting cells. Thereby, a large variety of ion channels has been identified in the pathogenesis of obesity such as potassium, sodium, calcium and chloride channels, nicotinic acetylcholine receptor and transient receptor potential channels. The fundamental involvement of these channels on the generation of obesity leads to the progress in the knowledge about the mechanisms responsible for the obesity pathophysiology, consequently emerging as new targets for pharmacological modulation.
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Affiliation(s)
- Luiz H C Vasconcelos
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Iara L L Souza
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Lílian S Pinheiro
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Bagnólia A Silva
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoão Pessoa, Brazil; Departamento de Ciências Farmacêuticas, Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoão Pessoa, Brazil
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8
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Effects of BKCa and Kir2.1 Channels on Cell Cycling Progression and Migration in Human Cardiac c-kit+ Progenitor Cells. PLoS One 2015; 10:e0138581. [PMID: 26390131 PMCID: PMC4577111 DOI: 10.1371/journal.pone.0138581] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Accepted: 09/01/2015] [Indexed: 12/24/2022] Open
Abstract
Our previous study demonstrated that a large-conductance Ca2+-activated K+ current (BKCa), a voltage-gated TTX-sensitive sodium current (INa.TTX), and an inward rectifier K+ current (IKir) were heterogeneously present in most of human cardiac c-kit+ progenitor cells. The present study was designed to investigate the effects of these ion channels on cell cycling progression and migration of human cardiac c-kit+ progenitor cells with approaches of cell proliferation and mobility assays, siRNA, RT-PCR, Western blots, flow cytometry analysis, etc. It was found that inhibition of BKCa with paxilline, but not INa.TTX with tetrodotoxin, decreased both cell proliferation and migration. Inhibition of IKir with Ba2+ had no effect on cell proliferation, while enhanced cell mobility. Silencing KCa.1.1 reduced cell proliferation by accumulating the cells at G0/G1 phase and decreased cell mobility. Interestingly, silencing Kir2.1 increased the cell migration without affecting cell cycling progression. These results demonstrate the novel information that blockade or silence of BKCa channels, but not INa.TTX channels, decreases cell cycling progression and mobility, whereas inhibition of Kir2.1 channels increases cell mobility without affecting cell cycling progression in human cardiac c-kit+ progenitor cells.
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9
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Petecchia L, Sbrana F, Utzeri R, Vercellino M, Usai C, Visai L, Vassalli M, Gavazzo P. Electro-magnetic field promotes osteogenic differentiation of BM-hMSCs through a selective action on Ca(2+)-related mechanisms. Sci Rep 2015; 5:13856. [PMID: 26364969 PMCID: PMC4568470 DOI: 10.1038/srep13856] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 08/07/2015] [Indexed: 12/22/2022] Open
Abstract
Exposure to Pulsed Electromagnetic Field (PEMF) has been shown to affect proliferation and differentiation of human mesenchymal stem cells derived from bone marrow stroma (BM-hMSC). These cells offer considerable promise in the field of regenerative medicine, but their clinical application is hampered by major limitations such as poor availability and the time required to differentiate up to a stage suitable for implantation. For this reason, several research efforts are focusing on identifying strategies to speed up the differentiation process. In this work we investigated the in vitro effect of PEMF on Ca2+-related mechanisms promoting the osteogenic differentiation of BM-hMSC. Cells were daily exposed to PEMF while subjected to osteogenic differentiation and various Ca2+-related mechanisms were monitored using multiple approaches for identifying functional and structural modifications related to this process. The results indicate that PEMF exposure promotes chemically induced osteogenesis by mechanisms that mainly interfere with some of the calcium-related osteogenic pathways, such as permeation and regulation of cytosolic concentration, leaving others, such as extracellular deposition, unaffected. The PEMF effect is primarily associated to early enhancement of intracellular calcium concentration, which is proposed here as a reliable hallmark of the osteogenic developmental stage.
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Affiliation(s)
- Loredana Petecchia
- Institute of Biophysics, National Research Council, Via De Marini 6, 16149 Genova, Italy
| | - Francesca Sbrana
- Institute of Biophysics, National Research Council, Via De Marini 6, 16149 Genova, Italy
| | - Roberto Utzeri
- Institute for Macromolecular Studies, National Research Council, Via De Marini 6, 16149 Genova, Italy
| | - Marco Vercellino
- Dept. of Molecular Medicine, Centre for Health Technologies (C.H.T.), INSTM UdR of Pavia, University of Pavia, Italy.,Dept. of Occupational Medicine, Ergonomy and Disability, Laboratory of Nanotechnology, Salvatore Maugeri Foundation, IRCCS, Pavia, Italy
| | - Cesare Usai
- Institute of Biophysics, National Research Council, Via De Marini 6, 16149 Genova, Italy
| | - Livia Visai
- Dept. of Molecular Medicine, Centre for Health Technologies (C.H.T.), INSTM UdR of Pavia, University of Pavia, Italy.,Dept. of Occupational Medicine, Ergonomy and Disability, Laboratory of Nanotechnology, Salvatore Maugeri Foundation, IRCCS, Pavia, Italy
| | - Massimo Vassalli
- Institute of Biophysics, National Research Council, Via De Marini 6, 16149 Genova, Italy
| | - Paola Gavazzo
- Institute of Biophysics, National Research Council, Via De Marini 6, 16149 Genova, Italy
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10
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Histamine-induced Ca²⁺ signalling is mediated by TRPM4 channels in human adipose-derived stem cells. Biochem J 2014; 463:123-34. [PMID: 25001294 DOI: 10.1042/bj20140065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Intracellular Ca2+ oscillations are frequently observed during stem cell differentiation, and there is evidence that it may control adipogenesis. The transient receptor potential melastatin 4 channel (TRPM4) is a key regulator of Ca2+ signals in excitable and non-excitable cells. However, its role in human adipose-derived stem cells (hASCs), in particular during adipogenesis, is unknown. We have investigated TRPM4 in hASCs and examined its impact on histamine-induced Ca2+ signalling and adipogenesis. Using reverse transcription (RT)-PCR, we have identified TRPM4 gene expression in hASCs and human adipose tissue. Electrophysiological recordings revealed currents with the characteristics of those reported for the channel. Furthermore, molecular suppression of TRPM4 with shRNA diminished the Ca2+ signals generated by histamine stimulation, mainly via histamine receptor 1 (H1) receptors. The increases in intracellular Ca2+ were due to influx via voltage-dependent Ca2+ channels (VDCCs) of the L-type (Ca(v)1.2) and release from the endoplasmic reticulum. Inhibition of TRPM4 by shRNA inhibited adipogenesis as indicated by the reduction in lipid droplet accumulation and adipocyte gene expression. These results suggest that TRPM4 is an important regulator of Ca2+ signals generated by histamine in hASCs and is required for adipogenesis.
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11
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Zhang YY, Li G, Che H, Sun HY, Li X, Au WK, Xiao GS, Wang Y, Li GR. Characterization of functional ion channels in human cardiac c-kit+ progenitor cells. Basic Res Cardiol 2014; 109:407. [DOI: 10.1007/s00395-014-0407-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 01/27/2014] [Accepted: 02/25/2014] [Indexed: 12/17/2022]
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12
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Pouliopoulos J, Chik WW, Kanthan A, Sivagangabalan G, Barry MA, Fahmy PN, Midekin C, Lu J, Kizana E, Thomas SP, Thiagalingam A, Kovoor P. Intramyocardial Adiposity After Myocardial Infarction. Circulation 2013; 128:2296-308. [DOI: 10.1161/circulationaha.113.002238] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jim Pouliopoulos
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - William W.B. Chik
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Ajita Kanthan
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Gopal Sivagangabalan
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Michael A. Barry
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Peter N.A. Fahmy
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Christine Midekin
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Juntang Lu
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Eddy Kizana
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Stuart P. Thomas
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Aravinda Thiagalingam
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
| | - Pramesh Kovoor
- From the Department of Cardiology, Westmead Hospital, Sydney, Australia (J.P., W.W.B.C., G.S., M.A.B., P.N.A.F., C.M., J.L., E.K., S.P.T., A.T., P.K.); University of Sydney, Sydney, Australia (W.W.B.C., A.K., G.S., P.N.A.F., E.K., S.P.T., A.T., P.K.); and Westmead Millennium Institute, Westmead, Australia (P.N.A.F., E.K.)
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Zhang YY, Yue J, Che H, Sun HY, Tse HF, Li GR. BKCaand hEag1 Channels Regulate Cell Proliferation and Differentiation in Human Bone Marrow-Derived Mesenchymal Stem Cells. J Cell Physiol 2013; 229:202-12. [DOI: 10.1002/jcp.24435] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 07/15/2013] [Indexed: 12/29/2022]
Affiliation(s)
- Ying-Ying Zhang
- Department of Medicine; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
| | - Jianbo Yue
- Department of Physiology; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
| | - Hui Che
- Department of Medicine; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
| | - Hai-Ying Sun
- Department of Medicine; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
- Department of Physiology; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
| | - Hung-Fat Tse
- Department of Medicine; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
| | - Gui-Rong Li
- Department of Medicine; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
- Department of Physiology; Li Ka Shing Faculty of Medicine; University of Hong Kong; Hong Kong China
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Che H, Yue J, Tse HF, Li GR. Functional TRPV and TRPM channels in human preadipocytes. Pflugers Arch 2013; 466:947-59. [PMID: 24057349 DOI: 10.1007/s00424-013-1355-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 09/09/2013] [Accepted: 09/09/2013] [Indexed: 12/30/2022]
Abstract
Preadipocytes are widely used as an in vitro model to investigate proliferation, adipogenic differentiation, and lipodystrophy; however, cellular physiology and biology are not fully understood in human preadipocytes. The present study was to investigate the expression of transient receptor potential (TRP) channels in human preadipocytes and their potential roles in regulating proliferation and adipogenic differentiation using approaches of confocal microscopy, whole-cell patch voltage-clamp, reverse transcription polymerase chain reaction, Western blot, etc. We found that TRPV2, TRPV4, and TRPM7 channels were abundantly expressed in human preadipocytes. The intracellular Ca(2+) transient activated by the TRPV2 activator probenecid was reversed or prevented by ruthenium red, a TRPV2 blocker. The TRPV4 channel activator, 4α-phorbol 12-13-dicaprinate, enhanced intracellular Ca(2+) oscillations, and the effect was inhibited by the TRPV4 blocker RN-1734. TRPM7 current was recorded with dialysis of Mg(2+)-free pipette solution, which was inhibited by the TRP channel blocker 2-aminoethoxydiphenyl borate and enhanced by acidic extracellular pH. Silencing TRPV2 or TRPM7, but not TRPV4, significantly reduced cell proliferation via inhibiting cyclin D1, cyclin E, and p-ERK1/2. Interestingly, individually silencing these three channels decreased adipogenic differentiation of human preadipocytes by reducing p-Akt kinase. Our results demonstrate for the first time that functional TRPV2, TRPV4, and TRPM7 channels are abundantly expressed in human preadipocytes. TRPV2 and TRPM7, but not TRPV4, regulate cell proliferation via activating cyclin D1, cyclin E, and p-ERK1/2, while they are all involved in adipogenesis in human preadipocytes via phosphorylating Akt kinase.
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Affiliation(s)
- Hui Che
- Department of Medicine, Li-Ka Shing Faculty of Medicine, University of Hong Kong, Laboratory Block, FMB, 21 Sassoon Road, Pokfulam, Hong Kong, China
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15
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Bishnoi M, Kiran Kondepudi K, Gupta A, Karmase A, Boparai RK. Expression of multiple Transient Receptor Potential channel genes in murine 3T3-L1 cell lines and adipose tissue. Pharmacol Rep 2013; 65:751-5. [DOI: 10.1016/s1734-1140(13)71055-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 12/28/2012] [Indexed: 11/30/2022]
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16
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Bishnoi M, Kondepudi KK, Baboota RK, Dubey R, Boparai RK. Role of transient receptor potential channels in adipocyte biology. Expert Rev Endocrinol Metab 2013; 8:173-182. [PMID: 30736177 DOI: 10.1586/eem.13.4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The transient receptor potential (TRP) channel superfamily is a family of 28 nonselective cation channels expressed on the plasma membrane with a high permeability to calcium. Role of TRP channels, especially TRP vanilloid 1, TRP ankyrin 1 and TRP melastatin 8, is widely documented in nociception. During the last few years, there has been a consistent increase in reports indicating the presence and significance of these channels in different tissues including bladder, skin, respiratory system and brain. Based on calcium permeability of these channels and the much published role of calcium and its signaling in adipogenesis, there is a potential for importance of these ion channels in adipocyte biology. This review provides insight into the involvement of TRP channels in adipocyte differentiation, obesity and associated complications. Furthermore, the authors will focus to evaluate these channels as potential therapeutic targets for the management of obesity.
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Affiliation(s)
- Mahendra Bishnoi
- a National Agri-Food Biotechnology Institute (NABI), C-127, Industrial Area, Phase VIII, SAS Nagar, Punjab 160071, India
- c National Agri-Food Biotechnology Institute (NABI), C-127, Industrial Area, Phase VIII, SAS Nagar, Punjab 160071, India.
| | - Kanthi K Kondepudi
- a National Agri-Food Biotechnology Institute (NABI), C-127, Industrial Area, Phase VIII, SAS Nagar, Punjab 160071, India
| | - Ritesh K Baboota
- a National Agri-Food Biotechnology Institute (NABI), C-127, Industrial Area, Phase VIII, SAS Nagar, Punjab 160071, India
| | - Ramakant Dubey
- a National Agri-Food Biotechnology Institute (NABI), C-127, Industrial Area, Phase VIII, SAS Nagar, Punjab 160071, India
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Lynch FM, Withers SB, Yao Z, Werner ME, Edwards G, Weston AH, Heagerty AM. Perivascular adipose tissue-derived adiponectin activates BK(Ca) channels to induce anticontractile responses. Am J Physiol Heart Circ Physiol 2013; 304:H786-95. [PMID: 23292715 DOI: 10.1152/ajpheart.00697.2012] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This study aims to identify the potential mechanisms by which perivascular adipose tissue (PVAT) reduces tone in small arteries. Small mesenteric arteries from wild-type and large-conductance Ca(2+)-activated K(+) (BKCa) channel knockout mice were mounted on a wire myograph in the presence and absence of PVAT, and contractile responses to norepinephrine were assessed. Electrophysiology studies were performed in isolated vessels to measure changes in membrane potential produced by adiponectin. Contractile responses from wild-type mouse small arteries were significantly reduced in the presence of PVAT. This was not observed in the presence of a BKCa channel inhibitor or with nitric oxide synthase (NOS) inhibition or in BKCa or adiponectin knockout mice. Solution transfer experiments demonstrated the presence of an anticontractile factor released from PVAT. Adiponectin-induced vasorelaxation and hyperpolarization in wild-type arteries were not evident in the absence of or after inhibition of BKCa channels. PVAT from BKCa or adiponectin knockout mice failed to elicit an anticontractile response in wild-type arteries. PVAT releases adiponectin, which is an anticontractile factor. Its effect on vascular tone is mediated by activation of BKCa channels on vascular smooth muscle cells and adipocytes and by endothelial mechanisms.
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Affiliation(s)
- Fiona M Lynch
- Institute of Cardiovascular Sciences, University of Manchester, Core Technology Facility, Manchester, United Kingdom.
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Baglioni S, Cantini G, Poli G, Francalanci M, Squecco R, Di Franco A, Borgogni E, Frontera S, Nesi G, Liotta F, Lucchese M, Perigli G, Francini F, Forti G, Serio M, Luconi M. Functional differences in visceral and subcutaneous fat pads originate from differences in the adipose stem cell. PLoS One 2012; 7:e36569. [PMID: 22574183 PMCID: PMC3344924 DOI: 10.1371/journal.pone.0036569] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 04/10/2012] [Indexed: 12/18/2022] Open
Abstract
Metabolic pathologies mainly originate from adipose tissue (AT) dysfunctions. AT differences are associated with fat-depot anatomic distribution in subcutaneous (SAT) and visceral omental (VAT) pads. We address the question whether the functional differences between the two compartments may be present early in the adipose stem cell (ASC) instead of being restricted to the mature adipocytes. Using a specific human ASC model, we evaluated proliferation/differentiation of ASC from abdominal SAT-(S-ASC) and VAT-(V-ASC) paired biopsies in parallel as well as the electrophysiological properties and functional activity of ASC and their in vitro-derived adipocytes. A dramatic difference in proliferation and adipogenic potential was observed between the two ASC populations, S-ASC having a growth rate and adipogenic potential significantly higher than V-ASC and giving rise to more functional and better organized adipocytes. To our knowledge, this is the first comprehensive electrophysiological analysis of ASC and derived-adipocytes, showing electrophysiological properties, such as membrane potential, capacitance and K(+)-current parameters which confirm the better functionality of S-ASC and their derived adipocytes. We document the greater ability of S-ASC-derived adipocytes to secrete adiponectin and their reduced susceptibility to lipolysis. These features may account for the metabolic differences observed between the SAT and VAT. Our findings suggest that VAT and SAT functional differences originate at the level of the adult ASC which maintains a memory of its fat pad of origin. Such stem cell differences may account for differential adipose depot susceptibility to the development of metabolic dysfunction and may represent a suitable target for specific therapeutic approaches.
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Affiliation(s)
- Silvana Baglioni
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Giulia Cantini
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Giada Poli
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Michela Francalanci
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Roberta Squecco
- Department of Physiological Sciences, University of Florence, Florence, Italy
| | - Alessandra Di Franco
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Elisa Borgogni
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Salvatore Frontera
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Gabriella Nesi
- Department of Human Pathology and Oncology, University of Florence, Florence, Italy
| | - Francesco Liotta
- Department of Internal Medicine, University of Florence, Florence, Italy
| | | | - Giuliano Perigli
- Department of General Surgery, University of Florence, Florence, Italy
| | - Fabio Francini
- Department of Physiological Sciences, University of Florence, Florence, Italy
| | - Gianni Forti
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Mario Serio
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Michaela Luconi
- Endocrine Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
- * E-mail:
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Zhang XH, Zhang YY, Sun HY, Jin MW, Li GR. Functional ion channels and cell proliferation in 3T3-L1 preadipocytes. J Cell Physiol 2012; 227:1972-9. [DOI: 10.1002/jcp.22925] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Maenhaut N, Van de Voorde J. Effect of hypoxia in mice mesenteric arteries surrounded by adipose tissue. Acta Physiol (Oxf) 2011; 203:235-44. [PMID: 21362151 DOI: 10.1111/j.1748-1716.2010.02238.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
AIM To investigate the influence of hypoxia on the vasoactive effect of peri-vascular white adipose tissue. METHODS Isometric tension recordings were performed on mesenteric arteries from Swiss male mice with or without adherent adipose tissue. RESULTS Hypoxia (bubbling with 95% N(2), 5% CO(2)) induced a biphasic response, i.e. vasoconstriction followed by vasorelaxation, in pre-contracted (noradrenaline, 10 μm) mesenteric arteries with adipose tissue in the presence of indomethacin (10 μm) and N(ω) -nitro-l-arginine (0.1 mm). Only a small vasorelaxation was observed in arteries without adipose tissue. Pre-contraction with 60 or 120 mm K(+) , incubation with tetraethylammoniumchloride (1 and 3 mm), apamin (1 μm) combined with charybdotoxin (0.1 μm) or 1-[(2-chlorophenyl) diphenylmethyl]-1H-pyrazole (TRAM-34) (10 μm) significantly impaired the hypoxic vasorelaxation. Removal of the endothelium only reduced the hypoxic vasorelaxation. Apamin (1 μm) and charybdotoxin (0.1 μm) did not influence the vasorelaxation of sodium hydrosulfide hydrate. Zinc protoporphyrin IX (10 μm), miconazole (10 μm), 8-(p-sulfophenyl)theophylline (0.1 mm), 1 H-[1, 2, 4]oxadiazolo[4,3- A]quinoxalin-1-one (10 μm), apocynin (0.3 mm), diphenyliodonium (1 μm), catalase (2500 U mL(-1)) and tempol (0.1 mm) did not influence the hypoxic vasorelaxation. In contrast to losartan (0.1 mm), indomethacin (10 μm) and SQ-29548 (10 μm) significantly reduced the hypoxic vasoconstriction. CONCLUSIONS Moderate hypoxia induces a biphasic vasomotor response in mice mesenteric arteries surrounded by adipose tissue. The hypoxic vasoconstriction is endothelium independent, whereas the vasodilation is endothelium dependent, soluble guanylyl cyclase independent and in part mediated by opening K(Ca) channels. Cyclooxygenase metabolites mediate the hypoxic vasoconstriction, while endothelium-derived hyperpolarizing factor plays a small role in the hypoxic vasorelaxation.
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Affiliation(s)
- N Maenhaut
- Department of Pharmacology, Ghent University, De Pintelaan, Belgium
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21
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Effects of ion channels on proliferation in cultured human cardiac fibroblasts. J Mol Cell Cardiol 2011; 51:198-206. [DOI: 10.1016/j.yjmcc.2011.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 04/24/2011] [Accepted: 05/11/2011] [Indexed: 01/01/2023]
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Jiao H, Arner P, Hoffstedt J, Brodin D, Dubern B, Czernichow S, van't Hooft F, Axelsson T, Pedersen O, Hansen T, Sørensen TIA, Hebebrand J, Kere J, Dahlman-Wright K, Hamsten A, Clement K, Dahlman I. Genome wide association study identifies KCNMA1 contributing to human obesity. BMC Med Genomics 2011; 4:51. [PMID: 21708048 PMCID: PMC3148553 DOI: 10.1186/1755-8794-4-51] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 06/28/2011] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Recent genome-wide association (GWA) analyses have identified common single nucleotide polymorphisms (SNPs) that are associated with obesity. However, the reported genetic variation in obesity explains only a minor fraction of the total genetic variation expected to be present in the population. Thus many genetic variants controlling obesity remain to be identified. The aim of this study was to use GWA followed by multiple stepwise validations to identify additional genes associated with obesity. METHODS We performed a GWA analysis in 164 morbidly obese subjects (BMI:body mass index>40 kg/m2) and 163 Swedish subjects (>45 years) who had always been lean. The 700 SNPs displaying the strongest association with obesity in the GWA were analyzed in a second cohort comprising 460 morbidly obese subjects and 247 consistently lean Swedish adults. 23 SNPs remained significantly associated with obesity (nominal P<0.05) and were in a step-wise manner followed up in five additional cohorts from Sweden, France, and Germany together comprising 4214 obese and 5417 lean or population-based control individuals. Three samples, n=4133, were used to investigate the population-based associations with BMI. Gene expression in abdominal subcutaneous adipose tissue in relation to obesity was investigated for14 adults. RESULTS Potassium channel, calcium activated, large conductance, subfamily M, alpha member (KCNMA1) rs2116830*G and BDNF rs988712*G were associated with obesity in five of six investigated case-control cohorts. In meta-analysis of 4838 obese and 5827 control subjects we obtained genome-wide significant allelic association with obesity for KCNMA1 rs2116830*G with P=2.82×10(-10) and an odds ratio (OR) based on cases vs controls of 1.26 [95% C.I. 1.12-1.41] and for BDNF rs988712*G with P=5.2×10(-17) and an OR of 1.36 [95% C.I. 1.20-1.55]. KCNMA1 rs2116830*G was not associated with BMI in the population-based samples. Adipose tissue (P=0.0001) and fat cell (P=0.04) expression of KCNMA1 was increased in obesity. CONCLUSIONS We have identified KCNMA1 as a new susceptibility locus for obesity, and confirmed the association of the BDNF locus at the genome-wide significant level.
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Affiliation(s)
- Hong Jiao
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83 Huddinge, Sweden
- Clinical Research Centre, Karolinska University Hospital, SE-141 57 Stockholm, Sweden
| | - Peter Arner
- Department of Medicine at Karolinska Institutet and Karolinska University Hospital, SE-141 86 Stockholm, Sweden
| | - Johan Hoffstedt
- Department of Medicine at Karolinska Institutet and Karolinska University Hospital, SE-141 86 Stockholm, Sweden
| | - David Brodin
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83 Huddinge, Sweden
| | - Beatrice Dubern
- INSERM, U-557/INRA U-1125, CNAM, UP13, CRNH-IdF, 93017 Bobigny, France; University Paris 13, 93017, Bobigny, France; AP-HP, Avicenne Hospital, 93017 Bobigny, France
| | - Sébastien Czernichow
- INSERM, U-557/INRA U-1125, CNAM, UP13, CRNH-IdF, 93017 Bobigny, France; University Paris 13, 93017, Bobigny, France; AP-HP, Avicenne Hospital, 93017 Bobigny, France
| | - Ferdinand van't Hooft
- Cardiovascular Genetics Group, Atherosclerosis Research Unit, Department of Medicine Solna, Karolinska Institutet, SE-17176 Stockholm, Sweden
| | - Tomas Axelsson
- Department of Medical Sciences, Molecular Medicine, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Oluf Pedersen
- Hagedorn Research Institute, Gentofte,, Copenhagen, Denmark
- Center of Basic Metabolic Research, Faculty of Health Sciences, University of Copenhagen, Denmark
| | - Torben Hansen
- Hagedorn Research Institute, Gentofte,, Copenhagen, Denmark
- Center of Basic Metabolic Research, Faculty of Health Sciences, University of Copenhagen, Denmark
| | - Thorkild IA Sørensen
- Institute for Preventive Medicine, Copenhagen University Hospital, Center for Health and Society, Copenhagen, Denmark
| | - Johannes Hebebrand
- Department of Child and Adolescent Psychiatry of the University of Duisburg-Essen, Essen, Germany
| | - Juha Kere
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83 Huddinge, Sweden
- Clinical Research Centre, Karolinska University Hospital, SE-141 57 Stockholm, Sweden
| | - Karin Dahlman-Wright
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83 Huddinge, Sweden
| | - Anders Hamsten
- Cardiovascular Genetics Group, Atherosclerosis Research Unit, Department of Medicine Solna, Karolinska Institutet, SE-17176 Stockholm, Sweden
| | - Karine Clement
- INSERM, U-872, Nutriomique (team 7) 75006 Paris, France; University Pierre and Marie Curie-Paris 6, Cordeliers Research Center, 75006 Paris, France; AP-HP, Pitié-Salpétrière Hospital, 75013 Paris, France
| | - Ingrid Dahlman
- Department of Medicine at Karolinska Institutet and Karolinska University Hospital, SE-141 86 Stockholm, Sweden
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Li GR, Deng XL. Functional ion channels in stem cells. World J Stem Cells 2011; 3:19-24. [PMID: 21607133 PMCID: PMC3097936 DOI: 10.4252/wjsc.v3.i3.19] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2010] [Revised: 01/14/2011] [Accepted: 01/21/2011] [Indexed: 02/06/2023] Open
Abstract
Bioelectrical signals generated by ion channels play crucial roles in excitation genesis and impulse conduction in excitable cells as well as in cell proliferation, migration and apoptosis in proliferative cells. Recent studies have demonstrated that multiple ion channels are heterogeneously present in different stem cells; however, patterns and phenotypes of ion channels are species- and/or origin-dependent. This editorial review focuses on the recent findings related to the expression of functional ion channels and the roles of these channels in regulation of cell proliferation in stem cells. Additional effort is required in the future to clarify the ion channel expression in different types of stem cells; special attention should be paid to the relationship between ion channels and stem cell proliferation, migration and differentiation.
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Affiliation(s)
- Gui-Rong Li
- Gui-Rong Li, Departments of Medicine and Physiology, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Pokfulam, Hong Kong, China
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Current world literature. Curr Opin Endocrinol Diabetes Obes 2010; 17:177-85. [PMID: 20190584 DOI: 10.1097/med.0b013e3283382286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Oguri A, Tanaka T, Iida H, Meguro K, Takano H, Oonuma H, Nishimura S, Morita T, Yamasoba T, Nagai R, Nakajima T. Involvement of CaV3.1 T-type calcium channels in cell proliferation in mouse preadipocytes. Am J Physiol Cell Physiol 2010; 298:C1414-23. [PMID: 20457833 DOI: 10.1152/ajpcell.00488.2009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Voltage-gated Ca(2+) channels (Ca(V)) are ubiquitously expressed in various cell types and play vital roles in regulation of cellular functions including proliferation. However, the molecular identities and function of Ca(V) remained unexplored in preadipocytes. Therefore, whole cell voltage-clamp technique, conventional/quantitative real-time RT-PCR, Western blot, small interfering RNA (siRNA) experiments, and immunohistochemical analysis were applied in mouse primary cultured preadipocytes as well as mouse 3T3-L1 preadipocytes. The effects of Ca(V) blockers on cell proliferation and cell cycle were also investigated. Whole cell recordings of 3T3-L1 preadipocytes showed low-threshold Ca(V), which could be inhibited by mibefradil, Ni(2+) (IC(50) of 200 muM), and NNC55-0396. Dominant expression of alpha(1G) mRNA was detected among Ca(V) transcripts (alpha(1A)-alpha(1I)), supported by expression of Ca(V)3.1 protein encoded by alpha(1G) gene, with immunohistochemical studies and Western blot analysis. siRNA targeted for alpha(1G) markedly inhibited Ca(V). Dominant expression of alpha(1G) mRNA and expression of Ca(V)3.1 protein were also observed in mouse primary cultured preadipocytes. Expression level of alpha(1G) mRNA and Ca(V)3.1 protein significantly decreased in differentiated adipocytes. Mibefradil, NNC55-0396, a selective T-type Ca(V) blocker, but not diltiazem, inhibited cell proliferation in response to serum. NNC55-0396 and siRNA targeted for alpha(1G) also prevented cell cycle entry/progression. The present study demonstrates that the Ca(V)3.1 T-type Ca(2+) channel encoded by alpha(1G) subtype is the dominant Ca(V) in mouse preadipocytes and may play a role in regulating preadipocyte proliferation, a key step in adipose tissue development.
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Affiliation(s)
- Atsushi Oguri
- Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan
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Hu H, Li DL, Fan L, Ren J, Wang SP, Jia B, Liu BH, Sun L, Yu XJ, Zang WJ. Involvement of volume-sensitive Cl−channels in the proliferation of human subcutaneous pre-adipocytes. Clin Exp Pharmacol Physiol 2010; 37:29-34. [DOI: 10.1111/j.1440-1681.2009.05223.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Li GR, Sun HY, Chen JB, Zhou Y, Tse HF, Lau CP. Characterization of multiple ion channels in cultured human cardiac fibroblasts. PLoS One 2009; 4:e7307. [PMID: 19806193 PMCID: PMC2751830 DOI: 10.1371/journal.pone.0007307] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2009] [Accepted: 09/14/2009] [Indexed: 01/11/2023] Open
Abstract
Background Although fibroblast-to-myocyte electrical coupling is experimentally suggested, electrophysiology of cardiac fibroblasts is not as well established as contractile cardiac myocytes. The present study was therefore designed to characterize ion channels in cultured human cardiac fibroblasts. Methods and Findings A whole-cell patch voltage clamp technique and RT-PCR were employed to determine ion channels expression and their molecular identities. We found that multiple ion channels were heterogeneously expressed in human cardiac fibroblasts. These include a big conductance Ca2+-activated K+ current (BKCa) in most (88%) human cardiac fibroblasts, a delayed rectifier K+ current (IKDR) and a transient outward K+ current (Ito) in a small population (15 and 14%, respectively) of cells, an inwardly-rectifying K+ current (IKir) in 24% of cells, and a chloride current (ICl) in 7% of cells under isotonic conditions. In addition, two types of voltage-gated Na+ currents (INa) with distinct properties were present in most (61%) human cardiac fibroblasts. One was a slowly inactivated current with a persistent component, sensitive to tetrodotoxin (TTX) inhibition (INa.TTX, IC50 = 7.8 nM), the other was a rapidly inactivated current, relatively resistant to TTX (INa.TTXR, IC50 = 1.8 µM). RT-PCR revealed the molecular identities (mRNAs) of these ion channels in human cardiac fibroblasts, including KCa.1.1 (responsible for BKCa), Kv1.5, Kv1.6 (responsible for IKDR), Kv4.2, Kv4.3 (responsible for Ito), Kir2.1, Kir2.3 (for IKir), Clnc3 (for ICl), NaV1.2, NaV1.3, NaV1.6, NaV1.7 (for INa.TTX), and NaV1.5 (for INa.TTXR). Conclusions These results provide the first information that multiple ion channels are present in cultured human cardiac fibroblasts, and suggest the potential contribution of these ion channels to fibroblast-myocytes electrical coupling.
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Affiliation(s)
- Gui-Rong Li
- Department of Medicine and Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.
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Hu R, He ML, Hu H, Yuan BX, Zang WJ, Lau CP, Tse HF, Li GR. Characterization of calcium signaling pathways in human preadipocytes. J Cell Physiol 2009; 220:765-70. [DOI: 10.1002/jcp.21823] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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