Cardiac acetylcholine inhibits ventricular remodeling and dysfunction under pathologic conditions
Autonomic dysfunction is a characteristic of cardiac disease and decreased vagal activity is observed in heart failure. Rodent cardiomyocytes produce de novo ACh, which is critical in maintaining cardiac homeostasis. We report that this nonneuronal cholinergic system is also found in human cardiomyo...
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Published in | The FASEB journal Vol. 30; no. 2; p. 688 |
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01.02.2016
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Abstract | Autonomic dysfunction is a characteristic of cardiac disease and decreased vagal activity is observed in heart failure. Rodent cardiomyocytes produce de novo ACh, which is critical in maintaining cardiac homeostasis. We report that this nonneuronal cholinergic system is also found in human cardiomyocytes, which expressed choline acetyltransferase (ChAT) and the vesicular acetylcholine transporter (VAChT). Furthermore, VAChT expression was increased 3- and 1.5-fold at the mRNA and protein level, respectively, in ventricular tissue from patients with heart failure, suggesting increased ACh secretion in disease. We used mice with genetic deletion of cardiomyocyte-specific VAChT or ChAT and mice overexpressing VAChT to test the functional significance of cholinergic signaling. Mice deficient for VAChT displayed an 8% decrease in fractional shortening and 13% decrease in ejection fraction compared with angiotensin II (Ang II)-treated control animals, suggesting enhanced ventricular dysfunction and pathologic remodeling in response to Ang II. Similar results were observed in ChAT-deficient mice. Conversely, no decline in ventricular function was observed in Ang II-treated VAChT overexpressors. Furthermore, the fibrotic area was significantly greater (P < 0.05) in Ang II-treated VAChT-deficient mice (3.61 ± 0.64%) compared with wild-type animals (2.24 ± 0.11%). In contrast, VAChT overexpressing mice did not display an increase in collagen deposition. Our results provide new insight into cholinergic regulation of cardiac function, suggesting that a compensatory increase in cardiomyocyte VAChT levels may help offset cardiac remodeling in heart failure. |
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AbstractList | Autonomic dysfunction is a characteristic of cardiac disease and decreased vagal activity is observed in heart failure. Rodent cardiomyocytes produce de novo ACh, which is critical in maintaining cardiac homeostasis. We report that this nonneuronal cholinergic system is also found in human cardiomyocytes, which expressed choline acetyltransferase (ChAT) and the vesicular acetylcholine transporter (VAChT). Furthermore, VAChT expression was increased 3- and 1.5-fold at the mRNA and protein level, respectively, in ventricular tissue from patients with heart failure, suggesting increased ACh secretion in disease. We used mice with genetic deletion of cardiomyocyte-specific VAChT or ChAT and mice overexpressing VAChT to test the functional significance of cholinergic signaling. Mice deficient for VAChT displayed an 8% decrease in fractional shortening and 13% decrease in ejection fraction compared with angiotensin II (Ang II)-treated control animals, suggesting enhanced ventricular dysfunction and pathologic remodeling in response to Ang II. Similar results were observed in ChAT-deficient mice. Conversely, no decline in ventricular function was observed in Ang II-treated VAChT overexpressors. Furthermore, the fibrotic area was significantly greater (P < 0.05) in Ang II-treated VAChT-deficient mice (3.61 ± 0.64%) compared with wild-type animals (2.24 ± 0.11%). In contrast, VAChT overexpressing mice did not display an increase in collagen deposition. Our results provide new insight into cholinergic regulation of cardiac function, suggesting that a compensatory increase in cardiomyocyte VAChT levels may help offset cardiac remodeling in heart failure. |
Author | Feng, Qingping Gros, Robert Guatimosim, Silvia Prado, Marco A M Tezini, Geisa C S V Liu, Yin Prado, Vania F Roy, Ashbeel Salgado, Helio C Dakroub, Mouhamed |
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Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 4 givenname: Yin surname: Liu fullname: Liu, Yin organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 5 givenname: Silvia surname: Guatimosim fullname: Guatimosim, Silvia organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 6 givenname: Qingping surname: Feng fullname: Feng, Qingping organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 7 givenname: Helio C surname: Salgado fullname: Salgado, Helio C organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 8 givenname: Vania F surname: Prado fullname: Prado, Vania F organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil – sequence: 9 givenname: Marco A M surname: Prado fullname: Prado, Marco A M email: mprado@robarts.ca, rgros@robarts.ca organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil mprado@robarts.ca rgros@robarts.ca – sequence: 10 givenname: Robert surname: Gros fullname: Gros, Robert email: mprado@robarts.ca, rgros@robarts.ca organization: Robarts Research Institute, Department of Physiology and Pharmacology, Department of Medicine, and Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario, Canada; Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; and Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil mprado@robarts.ca rgros@robarts.ca |
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Keywords | heart failure choline acetyltransferase heart disease VAChT nonneuronal acetylcholine |
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SubjectTerms | Acetylcholine - metabolism Animals Cells, Cultured Choline O-Acetyltransferase - genetics Choline O-Acetyltransferase - metabolism Gene Expression Regulation, Enzymologic - physiology Heart Failure - metabolism Humans Male Mice Mice, Knockout Myocytes, Cardiac - enzymology Myocytes, Cardiac - metabolism RNA, Messenger - genetics RNA, Messenger - metabolism Ventricular Remodeling - physiology Vesicular Acetylcholine Transport Proteins - genetics Vesicular Acetylcholine Transport Proteins - metabolism |
Title | Cardiac acetylcholine inhibits ventricular remodeling and dysfunction under pathologic conditions |
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