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Gaspers LD, Thomas AP, Hoek JB, Bartlett PJ. Ethanol Disrupts Hormone-Induced Calcium Signaling in Liver. FUNCTION (OXFORD, ENGLAND) 2021; 2:zqab002. [PMID: 33604575 PMCID: PMC7875097 DOI: 10.1093/function/zqab002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/22/2020] [Accepted: 12/30/2020] [Indexed: 01/06/2023]
Abstract
Receptor-coupled phospholipase C (PLC) is an important target for the actions of ethanol. In the ex vivo perfused rat liver, concentrations of ethanol >100 mM were required to induce a rise in cytosolic calcium (Ca2+) suggesting that these responses may only occur after binge ethanol consumption. Conversely, pharmacologically achievable concentrations of ethanol (≤30 mM) decreased the frequency and magnitude of hormone-stimulated cytosolic and nuclear Ca2+ oscillations and the parallel translocation of protein kinase C-β to the membrane. Ethanol also inhibited gap junction communication resulting in the loss of coordinated and spatially organized intercellular Ca2+ waves in hepatic lobules. Increasing the hormone concentration overcame the effects of ethanol on the frequency of Ca2+ oscillations and amplitude of the individual Ca2+ transients; however, the Ca2+ responses in the intact liver remained disorganized at the intercellular level, suggesting that gap junctions were still inhibited. Pretreating hepatocytes with an alcohol dehydrogenase inhibitor suppressed the effects of ethanol on hormone-induced Ca2+ increases, whereas inhibiting aldehyde dehydrogenase potentiated the inhibitory actions of ethanol, suggesting that acetaldehyde is the underlying mediator. Acute ethanol intoxication inhibited the rate of rise and the magnitude of hormone-stimulated production of inositol 1,4,5-trisphosphate (IP3), but had no effect on the size of Ca2+ spikes induced by photolysis of caged IP3. These findings suggest that ethanol inhibits PLC activity, but does not affect IP3 receptor function. We propose that by suppressing hormone-stimulated PLC activity, ethanol interferes with the dynamic modulation of [IP3] that is required to generate large, amplitude Ca2+ oscillations.
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Affiliation(s)
- Lawrence D Gaspers
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA,Address correspondence to L.D.G. (e-mail: )
| | - Andrew P Thomas
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
| | - Jan B Hoek
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Paula J Bartlett
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, USA
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Yoon MN, Kim MJ, Koong HS, Kim DK, Kim SH, Park HS. Ethanol suppresses carbamylcholine-induced intracellular calcium oscillation in mouse pancreatic acinar cells. Alcohol 2017; 63:53-59. [PMID: 28847382 DOI: 10.1016/j.alcohol.2017.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 03/23/2017] [Accepted: 03/23/2017] [Indexed: 12/31/2022]
Abstract
Oscillation of intracellular calcium levels is closely linked to initiating secretion of digestive enzymes from pancreatic acinar cells. Excessive alcohol consumption is known to relate to a variety of disorders in the digestive system, including the exocrine pancreas. In this study, we have investigated the role and mechanism of ethanol on carbamylcholine (CCh)-induced intracellular calcium oscillation in murine pancreatic acinar cells. Ethanol at concentrations of 30 and 100 mM reversibly suppressed CCh-induced Ca2+ oscillation in a dose-dependent manner. Pretreatment of ethanol has no effect on the store-operated calcium entry induced by 10 μM of CCh. Ethanol significantly reduced the initial calcium peak induced by low concentrations of CCh and therefore, the CCh-induced dose-response curve of the initial calcium peak was shifted to the right by ethanol pretreatment. Furthermore, ethanol significantly dose-dependently reduced inositol 1,4,5-trisphosphate-induced calcium release from the internal stores in permeabilized acinar cells. These results provide evidence that excessive alcohol intake could impair cytosolic calcium oscillation through inhibiting calcium release from intracellular stores in mouse pancreatic acinar cells.
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Affiliation(s)
- Mi Na Yoon
- Department of Physiology, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Min Jae Kim
- Department of Physiology, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Hwa Soo Koong
- Department of Dental Hygiene, College of Medical Science, Konyang University, Daejeon 35365, Republic of Korea
| | - Dong Kwan Kim
- Department of Physiology, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Se Hoon Kim
- Department of Physiology, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea
| | - Hyung Seo Park
- Department of Physiology, College of Medicine, Konyang University, Daejeon 35365, Republic of Korea; Myunggok Medical Research Institute, Konyang University, Daejeon 35365, Republic of Korea.
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Feriod CN, Nguyen L, Jurczak MJ, Kruglov EA, Nathanson MH, Shulman GI, Bennett AM, Ehrlich BE. Inositol 1,4,5-trisphosphate receptor type II (InsP3R-II) is reduced in obese mice, but metabolic homeostasis is preserved in mice lacking InsP3R-II. Am J Physiol Endocrinol Metab 2014; 307:E1057-64. [PMID: 25315698 PMCID: PMC4254986 DOI: 10.1152/ajpendo.00236.2014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Inositol 1,4,5-trisphosphate receptor type II (InsP3R-II) is the most prevalent isoform of the InsP3R in hepatocytes and is concentrated under the canalicular membrane, where it plays an important role in bile secretion. We hypothesized that altered calcium (Ca(2+)) signaling may be involved in metabolic dysfunction, as InsP3R-mediated Ca(2+) signals have been implicated in the regulation of hepatic glucose homeostasis. Here, we find that InsP3R-II, but not InsP3R-I, is reduced in the livers of obese mice. In our investigation of the functional consequences of InsP3R-II deficiency, we found that organic anion secretion at the canalicular membrane and Ca(2+) signals were impaired. However, mice lacking InsP3R-II showed no deficits in energy balance, glucose production, glucose tolerance, or susceptibility to hepatic steatosis. Thus, our results suggest that reduced InsP3R-II expression is not sufficient to account for any disruptions in metabolic homeostasis that are observed in mouse models of obesity. We conclude that metabolic homeostasis is maintained independently of InsP3R-II. Loss of InsP3R-II does impair secretion of bile components; therefore, we suggest that conditions of obesity would lead to a decrease in this Ca(2+)-sensitive process.
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Affiliation(s)
- Colleen N Feriod
- Department of Cellular and Molecular Physiology, Yale University School of Medicine New Haven, Connecticut
| | - Lily Nguyen
- Department of Pharmacology, Yale University School of Medicine New Haven, Connecticut
| | - Michael J Jurczak
- Department of Internal Medicine, Yale University School of Medicine New Haven, Connecticut
| | - Emma A Kruglov
- Section of Digestive Diseases, Yale University School of Medicine New Haven, Connecticut
| | - Michael H Nathanson
- Section of Digestive Diseases, Yale University School of Medicine New Haven, Connecticut
| | - Gerald I Shulman
- Department of Cellular and Molecular Physiology, Yale University School of Medicine New Haven, Connecticut; Department of Internal Medicine, Yale University School of Medicine New Haven, Connecticut; Howard Hughes Medical Institute, Chevy Chase, Maryland
| | - Anton M Bennett
- Department of Pharmacology, Yale University School of Medicine New Haven, Connecticut; Program in Integrative Cell Signaling and Neurobiology of Metabolism, Yale University School of Medicine New Haven, Connecticut; and
| | - Barbara E Ehrlich
- Department of Cellular and Molecular Physiology, Yale University School of Medicine New Haven, Connecticut; Department of Pharmacology, Yale University School of Medicine New Haven, Connecticut;
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Shukla SD, Sun GY, Gibson Wood W, Savolainen MJ, Alling C, Hoek JB. Ethanol and lipid metabolic signaling. Alcohol Clin Exp Res 2001. [PMID: 11391046 DOI: 10.1111/j.1530-0277.2001.tb02370.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This article represents the proceedings of a symposium at the 2000 ISBRA Meeting in Yokohama, Japan. The chairs were Shivendra D. Shukla and Grace Y. Sun. The presentations were (1) Metabolic turnover of ethanol into cellular lipids and platelet activating factor, by Shivendra D. Shukla; (2) Ethanol action on the phospholipase A2 signaling pathways in astrocytes, by Grace Y. Sun; (3) Mechanisms of ethanol-induced perturbation of lipoprotein cholesterol transport, by W. Gibson Wood; (4) Transfer of an abnormal ethanol-induced phospholipid, phosphatidylethanol, between lipoproteins, by Markku J. Savolainen; (5) Phospholipase-d-mediated formation of phosphatidylethanol, by Christer Alling; and (6) Changes in phosphoinositide signaling after chronic ethanol treatment, by Jan B. Hoek.
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Affiliation(s)
- S D Shukla
- Department of Pharmacology, University of Missouri Columbia, School of Medicine, Columbia, Missouri 65212, USA.
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Shukla SD, Sun GY, Gibson Wood W, Savolainen MJ, Alling C, Hoek JB. Ethanol and lipid metabolic signaling. Alcohol Clin Exp Res 2001; 25:33S-39S. [PMID: 11391046 DOI: 10.1097/00000374-200105051-00006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This article represents the proceedings of a symposium at the 2000 ISBRA Meeting in Yokohama, Japan. The chairs were Shivendra D. Shukla and Grace Y. Sun. The presentations were (1) Metabolic turnover of ethanol into cellular lipids and platelet activating factor, by Shivendra D. Shukla; (2) Ethanol action on the phospholipase A2 signaling pathways in astrocytes, by Grace Y. Sun; (3) Mechanisms of ethanol-induced perturbation of lipoprotein cholesterol transport, by W. Gibson Wood; (4) Transfer of an abnormal ethanol-induced phospholipid, phosphatidylethanol, between lipoproteins, by Markku J. Savolainen; (5) Phospholipase-d-mediated formation of phosphatidylethanol, by Christer Alling; and (6) Changes in phosphoinositide signaling after chronic ethanol treatment, by Jan B. Hoek.
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Affiliation(s)
- S D Shukla
- Department of Pharmacology, University of Missouri Columbia, School of Medicine, Columbia, Missouri 65212, USA.
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Rodríguez FD. The inhibition of [³H] inositol 1,4,5-trisphosphate binding by Ca²⁺ is modified after long-term ethanol treatment and ethanol withdrawal. Addict Biol 2000; 5:153-6. [PMID: 20575829 DOI: 10.1080/13556210050003739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
We have analysed the influence of long-term ethanol exposure on the effect exerted by Ca²⁺ on the binding of tritiated inositol 1,4,5-trisphosphate to its receptors in rat cerebellar membranes. After 21 days of ethanol treatment the binding of the agonist was reduced in the absence of Ca²⁺. The decrease was due to reduction in B max without any alteration of K d. In membranes from control animals Ca²⁺ inhibited the binding of InsP₃ in a dose-dependent manner by altering the affinity of the protein for the ligand. However, the inhibitory effect of Ca²⁺ was abolished following chronic ethanol exposure. Five days after withdrawing ethanol, the B max recovered to control values, but the inhibitory effect of Ca²⁺ was recovered at only 10 days after withdrawal. The results indicate that long-term ethanol exposure may have differential effects on the InsP₃binding site and on the Ca²⁺ binding site, or alternatively on a Ca²⁺ -related regulatory cycle.
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Bokkala S, Rubin E, Joseph SK. Effect of Chronic Ethanol Exposure on Inositol Trisphosphate Receptors in WB Rat Liver Epithelial Cells. Alcohol Clin Exp Res 1999. [DOI: 10.1111/j.1530-0277.1999.tb04086.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Zhang MI, O'Neil RG. The diversity of calcium channels and their regulation in epithelial cells. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 1999; 46:43-83. [PMID: 10332501 DOI: 10.1016/s1054-3589(08)60469-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- M I Zhang
- Department of Integrative Biology, Pharmacology, and Physiology, University of Texas-Houston Health Science Center 77030, USA
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