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Kula R, Bébarová M, Matejovič P, Šimurda J, Pásek M. Current density as routine parameter for description of ionic membrane current: is it always the best option? PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 157:24-32. [DOI: 10.1016/j.pbiomolbio.2019.11.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/20/2019] [Accepted: 11/26/2019] [Indexed: 12/17/2022]
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2
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Yu Y, Ye L, Li YG, Burkin DJ, Duan DD. Heart-specific overexpression of the human short CLC-3 chloride channel isoform limits myocardial ischemia-induced ERP and QT prolongation. Int J Cardiol 2016; 214:218-24. [PMID: 27064645 PMCID: PMC4862918 DOI: 10.1016/j.ijcard.2016.03.191] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 03/16/2016] [Accepted: 03/26/2016] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Ischemia causes myocardial infarction and arrhythmias. Up-regulation of cardiac CLC-3 chloride channels is important for ischemic preconditioning-induced second-window protection against myocardial infarction. But its consequences in ischemia-induced electrical remodeling are still unknown. METHODS The recently-characterized heart-specific overexpression of human short CLC-3 isoform (hsCLC-3(OE)) mice was used to study the effects of CLC-3 up-regulation on cardiac electrophysiology under ischemia/reperfusion conditions. In vivo surface electrocardiography (ECG) and intracardiac electrophysiology (ICEP) were used to compare the electrophysiological properties of age-matched wild-type (Clcn3(+/+)) and hsCLC-3(OE) mice under control and myocardial ischemia-reperfusion conditions. RESULTS QT and QTc intervals of hsCLC-3(OE) mice were significantly shorter than those of Clcn3(+/+) mice under control, ischemia and reperfusion conditions. In the ICEP, ventricular effective refractory period (VERP) of hsCLC-3(OE) mice (26.7±1.7ms, n=6) was significantly shorter than that of Clcn3(+/+) mice (36.9±2.8ms, n=8, P<0.05). Under ischemia condition, both VERP (19.8±1.3ms) and atrial effective refractory period (AERP, 34.8±2.5ms) of hsCLC-3(OE) mice were significantly shorter than those of Clcn3(+/+) mice (35.2±3.0ms and 45.8±1.6ms, P<0.01, respectively). Wenckebach atrioventricular nodal block point (AVBP, 91.13±4.08ms) and 2:1 AVBP (71.3±3.8ms) of hsCLC-3(OE) mice were significantly shorter than those of Clcn3(+/+) mice (102.0±2.0ms and 84.1±2.8ms, P<0.05, respectively). However, no differences of ICEP parameters between hsCLC-3(OE) and Clcn3(+/+) mice were observed under reperfusion conditions. CONCLUSION Heart-specific overexpression of hsCLC-3 limited the ischemia-induced QT and ERP prolongation and postponed the advancements of Wenckebach and 2:1 AVBP. CLC-3 up-regulation may serve as an important adaptive mechanism against myocardial ischemia.
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Affiliation(s)
- Ying Yu
- Department of Cardiology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China; Laboratory of Cardiovascular Phenomics, University of Nevada School of Medicine, Reno, NV 89557-0318, USA; Department of Pharmacology, University of Nevada School of Medicine, Reno, NV 89557-0318, USA
| | - Linda Ye
- Laboratory of Cardiovascular Phenomics, University of Nevada School of Medicine, Reno, NV 89557-0318, USA; Department of Pharmacology, University of Nevada School of Medicine, Reno, NV 89557-0318, USA
| | - Yi-Gang Li
- Department of Cardiology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China.
| | - Dean J Burkin
- Department of Pharmacology, University of Nevada School of Medicine, Reno, NV 89557-0318, USA
| | - Dayue Darrel Duan
- Laboratory of Cardiovascular Phenomics, University of Nevada School of Medicine, Reno, NV 89557-0318, USA; Department of Pharmacology, University of Nevada School of Medicine, Reno, NV 89557-0318, USA.
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3
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De Mello WC. Regulation of cell volume and water transport--an old fundamental role of the renin angiotensin aldosterone system components at the cellular level. Peptides 2014; 58:74-7. [PMID: 24945466 PMCID: PMC7172966 DOI: 10.1016/j.peptides.2014.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/03/2014] [Accepted: 06/03/2014] [Indexed: 12/12/2022]
Abstract
The expression and the role of renin angiotensin aldosterone system (RAAS) components on regulation of cell volume and water transport on vertebrates and invertebrates were reviewed. The presence of these components even in simple organisms like leeches and their relevance for the control of cellular volume and water transport supports the view that the expression of these components, at cellular level, is an acquisition which was preserved throughout evolution.
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Affiliation(s)
- Walmor C De Mello
- School of Medicine, Medical Sciences Campus, UPR, San Juan, PR 00936, USA.
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4
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Moench I, Meekhof KE, Cheng LF, Lopatin AN. Resolution of hyposmotic stress in isolated mouse ventricular myocytes causes sealing of t-tubules. Exp Physiol 2013; 98:1164-77. [PMID: 23585327 DOI: 10.1113/expphysiol.2013.072470] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
It has recently been shown that various stress-inducing manipulations in isolated ventricular myocytes may lead to significant remodelling of t-tubules. Osmotic stress is one of the most common complications in various experimental and clinical settings. This study was therefore designed to determine the effects of a physiologically relevant type of osmotic stress, hyposmotic challenge, to the integrity of the t-tubular system in mouse ventricular myocytes using the following two approaches: (1) electrophysiological measurements of membrane capacitance and inward rectifier (IK1) tail currents originating from K(+) accumulation in t-tubules; and (2) confocal microscopy of fluorescent dextrans trapped in sealed t-tubules. Importantly, we found that removal of '0.6 Na' (60% NaCl) hyposmotic solution, but not its application to myocytes, led to a ∼27% reduction in membrane capacitance, a ∼2.5-fold reduction in the amplitude of the IK1 tail current and a ∼2-fold reduction in the so-called IK1 'inactivation' (due to depletion of t-tubular K(+)) at negative membrane potentials; all these data were consistent with significant detubulation. Confocal imaging experiments also demonstrated that extracellularly applied dextrans become trapped in sealed t-tubules only upon removal of hyposmotic solutions, i.e. during the shrinking phase, but not during the initial swelling period. In light of these data, relevant previous studies, including those on excitation-contraction coupling phenomena during hyposmotic stress, may need to be reinterpreted, and the experimental design of future experiments should take into account the novel findings.
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Affiliation(s)
- I Moench
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
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5
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Duan DD, Wang G. Double the keys, double the control: coupled phosphorylation sites provide novel molecular targets for precise control of ion channel function. Focus on "Differential regulation of a CLC anion channel by SPAK kinase ortholog-mediated multisite phosphorylation". Am J Physiol Cell Physiol 2012; 302:C1699-701. [PMID: 22496246 DOI: 10.1152/ajpcell.00107.2012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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6
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Novel aspects of angiotensin II action in the heart. Implications to myocardial ischemia and heart failure. ACTA ACUST UNITED AC 2011; 166:9-14. [DOI: 10.1016/j.regpep.2010.10.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 08/18/2010] [Accepted: 10/04/2010] [Indexed: 02/01/2023]
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7
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De Mello WC. Angiotensin (1-7) reduces the cell volume of swollen cardiac cells and decreases the swelling-dependent chloride current. Implications for cardiac arrhythmias and myocardial ischemia. Peptides 2010; 31:2322-4. [PMID: 20816713 DOI: 10.1016/j.peptides.2010.08.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2010] [Revised: 08/25/2010] [Accepted: 08/25/2010] [Indexed: 11/29/2022]
Abstract
The influence of angiotensin II and angiotensin (1-17) on cell volume and on the activation of ionic channels including the swelling-dependent chloride channel was reviewed. Particular emphasis was given to the influence of the balance between the ACE-angiotensin II and of the ACE2-angiotensin (1-7)-Mas receptor axis on heart cell volume regulation and on the swelling-dependent chloride current. The implications for myocardial ischemia and cardiac arrhythmias are discussed.
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Affiliation(s)
- Walmor C De Mello
- Medical Sciences Campus, UPR, School of Medicine, PO BOX 365067, San Juan, PR 00936-5067, USA.
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8
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De Mello WC, Gerena Y. Further studies on the effects of intracrine and extracellular angiotensin II on the regulation of heart cell volume. On the influence of aldosterone and spironolactone. ACTA ACUST UNITED AC 2010; 165:200-5. [PMID: 20692299 DOI: 10.1016/j.regpep.2010.07.165] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 07/01/2010] [Accepted: 07/26/2010] [Indexed: 10/19/2022]
Abstract
The influence of extracellular and intracellular angiotensin II (Ang II) on the cell volume in the failing heart of cardiomyopathic hamsters (TO2) was further investigated as well as the influence of aldosterone and spironolactone on the Ang II action on cell volume. Measurements of cell width and area of quiescent ventricular cardiomyocytes were performed using a video camera and computer analysis and the relative cell volume was calculated. All measurements of cell volume were performed in the same cell before and after the administration of Ang II (10⁻⁸M). The results indicated that: a) the increase in cell volume caused by extracellular Ang II(10⁻⁸ M) was enhanced in cells incubated with aldosterone (100 nM) for 48 h; b) the effect of aldosterone was abolished by spironolactone (10⁻⁸ M); c) the decline in cell volume elicited by intracellular administration of Ang II (10⁻⁸ M) was increased by aldosterone and inhibited by spironolactone; d) the effects of aldosterone and spironolactone were related, in part, to a change in expression of AT1 receptors; and e) the intracellular administration of Ang II reduced the swelling-dependent chloride current (I(Clswell)). The implications of these findings to the failing heart and myocardial ischemia are discussed.
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Affiliation(s)
- W C De Mello
- Medical Sciences Campus, School of Medicine, University of Puerto Rico, San Juan, PR 00936-5067, USA.
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9
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Harron SA, Clarke CM, Jones CL, Babin-Muise D, Cowley EA. Volume regulation in the human airway epithelial cell line Calu-3. Can J Physiol Pharmacol 2009; 87:337-46. [PMID: 19448731 DOI: 10.1139/y09-009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cells regulate their volume in response to changes in the osmolarity of both their extracellular and their intracellular environments. We investigated the ability of the human airway epithelial cell line Calu-3 to respond to changes in extracellular osmolarity. Although switching Calu-3 cells from an isosmotic to a hyperosmotic environment resulted in cell shrinkage, there was no compensatory mechanism for the cells to return to their original volume. In contrast, switching to a hyposmotic environment resulted in an initial cell swelling response, followed by a regulatory volume decrease (RVD). Pharmacologic studies demonstrate that the voltage-activated K+ channels Kv4.1 and (or) Kv4.3 play a crucial role in mediating this RVD response, and we demonstrated expression of these channel types at the mRNA and protein levels. Furthermore, inhibition of the large- and intermediate-conductance Ca2+-activated K+ channels KCa1.1 (maxi-K) and KCa3.1 (hIK) also implicated these channels as playing a role in volume recovery in Calu-3 cells. This report describes the nature of volume regulation in the widely used model cell line Calu-3.
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Affiliation(s)
- Scott A Harron
- Department of Physiology and Biophysics, Dalhousie University, 5850 College Street, Halifax, NS B3H 1X5, Canada
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Hoffmann EK, Lambert IH, Pedersen SF. Physiology of cell volume regulation in vertebrates. Physiol Rev 2009; 89:193-277. [PMID: 19126758 DOI: 10.1152/physrev.00037.2007] [Citation(s) in RCA: 1023] [Impact Index Per Article: 68.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The ability to control cell volume is pivotal for cell function. Cell volume perturbation elicits a wide array of signaling events, leading to protective (e.g., cytoskeletal rearrangement) and adaptive (e.g., altered expression of osmolyte transporters and heat shock proteins) measures and, in most cases, activation of volume regulatory osmolyte transport. After acute swelling, cell volume is regulated by the process of regulatory volume decrease (RVD), which involves the activation of KCl cotransport and of channels mediating K(+), Cl(-), and taurine efflux. Conversely, after acute shrinkage, cell volume is regulated by the process of regulatory volume increase (RVI), which is mediated primarily by Na(+)/H(+) exchange, Na(+)-K(+)-2Cl(-) cotransport, and Na(+) channels. Here, we review in detail the current knowledge regarding the molecular identity of these transport pathways and their regulation by, e.g., membrane deformation, ionic strength, Ca(2+), protein kinases and phosphatases, cytoskeletal elements, GTP binding proteins, lipid mediators, and reactive oxygen species, upon changes in cell volume. We also discuss the nature of the upstream elements in volume sensing in vertebrate organisms. Importantly, cell volume impacts on a wide array of physiological processes, including transepithelial transport; cell migration, proliferation, and death; and changes in cell volume function as specific signals regulating these processes. A discussion of this issue concludes the review.
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Affiliation(s)
- Else K Hoffmann
- Department of Biology, University of Copenhagen, Copenhagen, Denmark.
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Abstract
Cell volume perturbation initiates a wide array of intracellular signalling cascades, leading to protective and adaptive events and, in most cases, activation of volume-regulatory osmolyte transport, water loss, and hence restoration of cell volume and cellular function. Cell volume is challenged not only under physiological conditions, e.g. following accumulation of nutrients, during epithelial absorption/secretion processes, following hormonal/autocrine stimulation, and during induction of apoptosis, but also under pathophysiological conditions, e.g. hypoxia, ischaemia and hyponatremia/hypernatremia. On the other hand, it has recently become clear that an increase or reduction in cell volume can also serve as a specific signal in the regulation of physiological processes such as transepithelial transport, cell migration, proliferation and death. Although the mechanisms by which cell volume perturbations are sensed are still far from clear, significant progress has been made with respect to the nature of the sensors, transducers and effectors that convert a change in cell volume into a physiological response. In the present review, we summarize recent major developments in the field, and emphasize the relationship between cell volume regulation and organism physiology/pathophysiology.
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Affiliation(s)
- I H Lambert
- Department of Biology, University of Copenhagen, Copenhagen, Denmark.
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Matsui S, Satoh H, Kawashima H, Nagasaka S, Niu CF, Urushida T, Katoh H, Watanabe Y, Hayashi H. Non-genomic effects of aldosterone on intracellular ion regulation and cell volume in rat ventricular myocytes. Can J Physiol Pharmacol 2007; 85:264-73. [PMID: 17487268 DOI: 10.1139/y07-017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aldosterone has non-genomic effects that express within minutes and modulate intracellular ion milieu and cellular function. However, it is still undefined whether aldosterone actually alters intracellular ion concentrations or cellular contractility. To clarify the non-genomic effects of aldosterone, we measured [Na+]i, Ca2+ transient (CaT), and cell volume in dye-loaded rat ventricular myocytes, and we also evaluated myocardial contractility. We found the following: (i) aldosterone increased [Na+]i at the concentrations of 100 nmol/L to 10 micromol/L; (ii) aldosterone (up to 10 micromol/L) did not alter CaT and cell shortening in isolated myocytes, developed tension in papillary muscles, or left ventricular developed pressure in Langendorff-perfused hearts; (iii) aldosterone (100 nmol/L) increased the cell volume from 47.5 +/- 3.6 pL to 49.8 +/- 3.7 pL (n=8, p<0.05); (iv) both the increases in [Na+]i and cell volume were blocked by a Na+-K+-2Cl- co-transporter (NKCCl) inhibitor, bumetanide, or by a Na+/H+ exchange (NHE) inhibitor, 5-(N-ethyl-N-isopropyl) amiloride; and (v) spironolactone by itself increased in [Na+]i and cell volume. In conclusion, aldosterone rapidly increased [Na+]i and cell volume via NKCC1 and NHE, whereas there were no changes in CaT or myocardial contractility. Hence the non-genomic effects of aldosterone may be related to cell swelling rather than the increase in contractility.
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Affiliation(s)
- Saori Matsui
- Division of Cardiology, Internal Medicine III, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, 431-3192, Japan
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Shi XL, Wang GL, Zhang Z, Liu YJ, Chen JH, Zhou JG, Qiu QY, Guan YY. Alteration of Volume-Regulated Chloride Movement in Rat Cerebrovascular Smooth Muscle Cells During Hypertension. Hypertension 2007; 49:1371-7. [PMID: 17438308 DOI: 10.1161/hypertensionaha.106.084657] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The cerebrovascular remodeling is a prominent feature of hypertension and considered a major risk factor for stroke. Cerebrovascular smooth muscle cells meet volume challenge during this pathophysiological process. Our previous studies suggest that volume regulated chloride channels may be critical to the cell cycle of vascular smooth muscle cells. However, it is unknown whether the volume-regulated chloride movement is altered in hypertension. Therefore, we directly measured the concentration of intracellular chloride ([Cl
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]
i
) in rat basilar arterial smooth muscle cells isolated from control rats and rats that were made hypertensive for 1 to 12 weeks after partial renal artery constriction (2-kidney, 2-clip method) using a 6-methoxy-
N
-ethylquinolinium iodide fluorescence probe. The [Cl
−
]
i
in isotonic solution showed no difference in all of the groups. After hypotonic perfusion, the reduction in [Cl
−
]
i
was more prominent in hypertensive cerebrovascular smooth muscle cells than in sham control cells. Genistein, a protein tyrosine kinase inhibitor, inhibited hypotonic-induced reduction in [Cl
−
]
i
, whereas sodium orthovanadate, a protein–tyrosine phosphatase inhibitor, enhanced hypotonic-induced reduction in [Cl
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]
i
in both groups. The percentage inhibition of reduction in [Cl
−
]
i
by genistein on volume-regulated chloride movement has a positive correlation with blood pressure levels in the 2-kidney, 2-clip hypertensive group, as is the case for the percentage increase of reduction in [Cl
−
]
i
by sodium orthovanadate. Antihypertensive therapy with the angiotensin-converting enzyme inhibitor captopril completely reversed abnormal volume-regulated chloride movement in hypertensive rats. We conclude that volume-regulated chloride movement is augmented in rat cerebrovascular smooth muscle cells in proportion to the severity of hypertension.
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Affiliation(s)
- Xiao-Lian Shi
- Department of Pharmacology, Zhongshan Medical College, Sun Yat-Sen University, 74 Zhongshan 2 Rd, Guangzhou, 510089, People's Republic of China
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