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Roles of volume-regulatory anion channels, VSOR and Maxi-Cl, in apoptosis, cisplatin resistance, necrosis, ischemic cell death, stroke and myocardial infarction. CURRENT TOPICS IN MEMBRANES 2019; 83:205-283. [DOI: 10.1016/bs.ctm.2019.03.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Zhang J, Wang Y, Jiang X, Chan HC. Cystic fibrosis transmembrane conductance regulator-emerging regulator of cancer. Cell Mol Life Sci 2018; 75:1737-1756. [PMID: 29411041 PMCID: PMC11105598 DOI: 10.1007/s00018-018-2755-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/27/2017] [Accepted: 01/17/2018] [Indexed: 12/11/2022]
Abstract
Mutations of cystic fibrosis transmembrane conductance regulator (CFTR) cause cystic fibrosis, the most common life-limiting recessive genetic disease among Caucasians. CFTR mutations have also been linked to increased risk of various cancers but remained controversial for a long time. Recent studies have begun to reveal that CFTR is not merely an ion channel but also an important regulator of cancer development and progression with multiple signaling pathways identified. In this review, we will first present clinical findings showing the correlation of genetic mutations or aberrant expression of CFTR with cancer incidence in multiple cancers. We will then focus on the roles of CFTR in fundamental cellular processes including transformation, survival, proliferation, migration, invasion and epithelial-mesenchymal transition in cancer cells, highlighting the signaling pathways involved. Finally, the association of CFTR expression levels with patient prognosis, and the potential of CFTR as a cancer prognosis indicator in human malignancies will be discussed.
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Affiliation(s)
- Jieting Zhang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China
| | - Yan Wang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China
| | - Xiaohua Jiang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
| | - Hsiao Chang Chan
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
- Sichuan University-The Chinese University of Hong Kong Joint Laboratory for Reproductive Medicine, West China Second University Hospital, Chengdu, People's Republic of China.
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Left ventricular and aortic dysfunction in cystic fibrosis mice. J Cyst Fibros 2012; 12:517-24. [PMID: 23269368 DOI: 10.1016/j.jcf.2012.11.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2012] [Revised: 11/21/2012] [Accepted: 11/25/2012] [Indexed: 11/23/2022]
Abstract
BACKGROUND Left ventricular (LV) abnormalities have been reported in cystic fibrosis (CF); however, it remains unclear if loss of cystic fibrosis transmembrane conductance regulator (CFTR) function causes heart defects independent of lung disease. METHODS Using gut-corrected F508del CFTR mutant mice (ΔF508), which do not develop human lung disease, we examined in vivo heart and aortic function via 2D transthoracic echocardiography and LV catheterization. RESULTS ΔF508 mouse hearts showed LV concentric remodeling along with enhanced inotropy (increased +dP/dt, fractional shortening, decreased isovolumetric contraction time) and greater lusitropy (-dP/dt, Tau). Aortas displayed increased stiffness and altered diastolic flow. β-adrenergic stimulation revealed diminished cardiac reserve (attenuated +dP/dt,-dP/dt, LV pressure). CONCLUSIONS In a mouse model of CF, CFTR mutation leads to LV remodeling with alteration of cardiac and aortic functions in the absence of lung disease. As CF patients live longer, more active lives, their risk for cardiovascular disease should be considered.
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Uramoto H, Okada T, Okada Y. Protective Role of Cardiac CFTR Activation Upon Early Reperfusion Against Myocardial Infarction. Cell Physiol Biochem 2012; 30:1023-38. [DOI: 10.1159/000341479] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/27/2012] [Indexed: 01/24/2023] Open
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Sellers ZM, De Arcangelis V, Xiang Y, Best PM. Cardiomyocytes with disrupted CFTR function require CaMKII and Ca(2+)-activated Cl(-) channel activity to maintain contraction rate. J Physiol 2010; 588:2417-29. [PMID: 20442264 DOI: 10.1113/jphysiol.2010.188334] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The physiological role of the cystic fibrosis transmembrane conductance regulator (CFTR) in cardiomyocytes remains unclear. Using spontaneously beating neonatal ventricular cardiomyocytes from wild-type (WT) or CFTR knockout (KO) mice, we examined the role of CFTR in the modulation of cardiomyocyte contraction rate. Contraction rates of spontaneously beating myocytes were captured by video imaging. Real-time changes in intracellular ([Ca(2+)](i)) and protein kinase A (PKA) activity were measured by fura-2 and fluorescence resonance energy transfer, respectively. Acute inhibition of CFTR in WT cardiomyocytes using the CFTR inhibitor CFTR(inh)-172 transiently inhibited the contraction rate. By contrast, cardiomyocytes from CFTR KO mice displayed normal contraction rates. Further investigation revealed that acute inhibition of CFTR activity in WT cardiomyocytes activated L-type Ca(2+) channels, leading to a transient increase of [Ca(2+)](i) and inhibition of PKA activity. Additionally, we found that contraction rate normalization following acute CFTR inhibition in WT cardiomyocytes or chronic deletion in cardiomyocytes from CFTR KO mice requires the activation of Ca(2+)/calmodulin-dependent kinase II (CaMKII) and Ca(2+)-activated Cl(-) channels (CaCC) because simultaneous addition of myristoylated-autocamtide-2-related inhibitory peptide or niflumic acid and CFTR(inh)-172 to WT cardiomyocytes or treatment of cardiomyoctes from CFTR KO mice with these agents caused sustained attenuation of contraction rates. Our results demonstrate that regulation of cardiomyocyte contraction involves CFTR. They also reveal that activation of CaMKII and CaCC compensates for loss of CFTR function. Increased dependence on CaMKII upon loss of CFTR function might leave cystic fibrosis patients at increased risk of heart dysfunction and disease.
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Affiliation(s)
- Zachary M Sellers
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
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Subramanyam M, Takahashi N, Hasegawa Y, Mohri T, Okada Y. Inhibition of protein kinase Akt1 by apoptosis signal-regulating kinase-1 (ASK1) is involved in apoptotic inhibition of regulatory volume increase. J Biol Chem 2010; 285:6109-17. [PMID: 20048146 DOI: 10.1074/jbc.m109.072785] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Most animal cell types regulate their cell volume after an osmotic volume change. The regulatory volume increase (RVI) occurs through uptake of NaCl and osmotically obliged water after osmotic shrinkage. However, apoptotic cells undergo persistent cell shrinkage without showing signs of RVI. Persistence of the apoptotic volume decrease is a prerequisite to apoptosis induction. We previously demonstrated that volume regulation is inhibited in human epithelial HeLa cells stimulated with the apoptosis inducer. Here, we studied signaling mechanisms underlying the apoptotic inhibition of RVI in HeLa cells. Hypertonic stimulation was found to induce phosphorylation of a Ser/Thr protein kinase Akt (protein kinase B). Shrinkage-induced Akt activation was essential for RVI induction because RVI was suppressed by an Akt inhibitor, expression of a dominant negative form of Akt, or small interfering RNA-mediated knockdown of Akt1 (but not Akt2). Staurosporine, tumor necrosis factor-alpha, or a Fas ligand inhibited both RVI and hypertonicity-induced Akt activation in a manner sensitive to a scavenger for reactive oxygen species (ROS). Any of apoptosis inducers also induced phosphorylation of apoptosis signal-regulating kinase 1 (ASK1) in a ROS-dependent manner. Suppression of (ASK1) expression blocked the effects of apoptosis, in hypertonic conditions, on both RVI induction and Akt activation. Thus, it is concluded that in human epithelial cells, shrinkage-induced activation of Akt1 is involved in the RVI process and that apoptotic inhibition of RVI is caused by inhibition of Akt activation, which results from ROS-mediated activation of ASK1.
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Affiliation(s)
- Muthangi Subramanyam
- Department of Cell Physiology, National Institute for Physiological Sciences, Okazaki 444-8585, Japan
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Zheng W, Kuhlicke J, Jäckel K, Eltzschig HK, Singh A, Sjöblom M, Riederer B, Weinhold C, Seidler U, Colgan SP, Karhausen J. Hypoxia inducible factor-1 (HIF-1)-mediated repression of cystic fibrosis transmembrane conductance regulator (CFTR) in the intestinal epithelium. FASEB J 2008; 23:204-13. [PMID: 18779379 DOI: 10.1096/fj.08-110221] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Diarrhea is widespread in intestinal diseases involving ischemia and/or hypoxia. Since hypoxia alters stimulated Cl(-) and water flux, we investigated the influence of such a physiologically and pathophysiologically important signal on expression of the cystic fibrosis transmembrane conductance regulator (CFTR). Located on the apical membrane, this cAMP-activated Cl(-) channel determines salt and fluid transport across mucosal surfaces. Our studies revealed depression of CFTR mRNA, protein, and function in hypoxic epithelia. Chromatin immunoprecipitation identified a previously unappreciated binding site for the hypoxia inducible factor-1 (HIF-1), and promoter studies established its relevance by loss of repression following point mutation. Consequently, HIF-1 overexpressing cells exhibited significantly reduced transport capacity in colorimetric Cl(-) efflux studies, altered short circuit measurements, and changes in transepithelial fluid movement. Whole-body hypoxia in wild-type mice resulted in significantly reduced small intestinal fluid and HCO(3)(-) secretory responses to forskolin. Experiments performed in Cftr(-/-) and Nkcc1(-/-) mice underlined the role of altered CFTR expression for these functional changes, and work in conditional Hif1a mutant mice verified HIF-1-dependent CFTR regulation in vivo. In summary, our study clarifies CFTR regulation and introduces the concept of a HIF-1-orchestrated response designed to regulate ion and fluid movement across hypoxic intestinal epithelia.
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Affiliation(s)
- Wen Zheng
- Abteilung Gastroenterologie, Hepatologie und Endokrinologie, Medizinische Hochschule Hannover, Hannover,
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Gao Z, Sun HY, Lau CP, Chin-Wan Fung P, Li GR. Evidence for cystic fibrosis transmembrane conductance regulator chloride current in swine ventricular myocytes. J Mol Cell Cardiol 2006; 42:98-105. [PMID: 17112538 DOI: 10.1016/j.yjmcc.2006.10.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Revised: 09/25/2006] [Accepted: 10/02/2006] [Indexed: 11/28/2022]
Abstract
The present study investigated whether cAMP-dependent cystic fibrosis transmembrane conductance regulator (CFTR) Cl(-) channel current (i.e., I(Cl.CFTR) or I(Cl.cAMP)) would be expressed in pig cardiac myocytes using whole-cell patch technique and reverse transcription polymerase chain reaction (RT-PCR). It was found that the beta-adrenoceptor agonist isoproterenol activated a time-independent current in myocytes from the ventricle, but not the atrium of pig heart. Histamine and forskolin (an adenylate cyclase activator) induced a similar current in pig ventricular cells. The current induced by isoproterenol was blocked by the PKA inhibitor H-7, reduced by the replacement of external Cl(-) ion, and inhibited by the application of 5-nitro-2-(3-phenylpropylamino) benzoic acid (NPPB), but not 4'-diisothiocynatostilbene-2,2'-disulfonic acid (DIDS), typical of I(Cl.CFTR). I(Cl.CFTR) showed a small difference in regional myocytes across the left ventricular wall from epicardium to endocardium. Isoproterenol-induced current was 3.1+/-0.2 (n=33), 2.8+/-0.2 (n=25) and 2.3+/-0.2 pA/pF (n=31) respectively in subepicardial, midmyocardial, and subendocardial myocytes (P<0.05, subepicardium vs. subendocardium). RT-PCR and Western blotting analysis revealed that significant differences in CFTR channel mRNA and protein levels were present in atrial and ventricular cells, but not in regional ventricular cells across the ventricular wall from subepicardium to subendocardium. These results indicate that the functional CFTR channel (i.e., I(Cl.CFTR)) is present in ventricular myocytes, but not in atrial cells of pig heart.
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Affiliation(s)
- Zhan Gao
- 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, SAR China
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Wang X, Takahashi N, Uramoto H, Okada Y. Chloride channel inhibition prevents ROS-dependent apoptosis induced by ischemia-reperfusion in mouse cardiomyocytes. Cell Physiol Biochem 2006; 16:147-54. [PMID: 16301815 DOI: 10.1159/000089840] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2005] [Indexed: 11/19/2022] Open
Abstract
Apoptosis of cardiomyocytes following ischemia and reperfusion is of clinical importance. However, little is known about the mechanism by which it is induced. Recently, essential roles of a Cl- channel whose activity triggers the apoptotic volume decrease and of reactive oxygen species (ROS) in activation of this channel have been identified in mitochondrion-mediated apoptosis. Therefore, in this study, involvement of Cl- channels and ROS in apoptosis was studied in primary mouse cardiomyocyte cultures subjected to ischemia-reperfusion. Apoptotic cell death as measured by caspase-3 activation, chromatin condensation, DNA laddering, and cell viability reduction was observed tens of hours after reperfusion but never immediately after ischemia. A non-selective Cl-channel blocker (DIDS or NPPB) rescued cells from apoptotic death when applied during the reperfusion, but not ischemia, period. Another blocker relatively specific to the volume-sensitive outwardly rectifying (VSOR) Cl-channel (phloretin) was also effective in protecting ischemic cardiomyocytes from apoptosis induced by reperfusion. A profound increase in intracellular ROS was detected in cardiomyocytes during the reperfusion, but not ischemia, period. Scavengers for ROS, H2O2 and superoxide all inhibited apoptosis induced by ischemia-reperfusion. Thus, it is concluded that the mechanism by which cardiomyocyte apoptosis is induced by ischemia-reperfusion involves VSOR Cl- channel activity and intracellular ROS production.
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Affiliation(s)
- Xiaoming Wang
- Department of Cell Physiology, National Institute for Physiological Sciences, Okazaki, Japan
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Tanabe S, Wang X, Takahashi N, Uramoto H, Okada Y. HCO(3)(-)-independent rescue from apoptosis by stilbene derivatives in rat cardiomyocytes. FEBS Lett 2005; 579:517-22. [PMID: 15642369 DOI: 10.1016/j.febslet.2004.12.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2004] [Revised: 12/06/2004] [Accepted: 12/07/2004] [Indexed: 11/23/2022]
Abstract
Apoptosis of rat cardiomyocytes induced by staurosporine is prevented by a stilbene derivative (DIDS), which is a known blocker of both Cl(-)/HCO(3)(-) exchangers and Cl(-) channels. To clarify its target, staurosporine-induced activation of caspase-3, DNA laddering and cell death were examined in cultured rat cardiomyocytes. Removal of ambient HCO(3)(-), which minimizes the function of Cl(-)/HCO(3)(-) exchangers, failed to affect the preventive effect of DIDS on apoptosis. A carboxylate analog Cl(-) channel blocker, which does not block Cl(-)/HCO(3)(-) exchangers, also inhibited apoptotic events. Thus, rescue by DIDS of cardiomyocytes from apoptosis is mediated by blockage of Cl(-) channels.
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Affiliation(s)
- Shigeru Tanabe
- Department of Cell Physiology and Molecular Physiology, National Institute for Physiological Sciences, Japan Science and Technology Agency, Myodaiji-cho, Okazaki 444-8585, Japan
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