Journal
JOURNAL OF HEPATOLOGY
Volume 55, Issue 6, Pages 1249-1255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhep.2011.02.030
Keywords
Cirrhotic cardiomyopathy; Cirrhosis; Cardiovascular; Liver; Heart
Categories
Funding
- Canadian Liver Foundation (CLF)
- Canadian Association for the Study of the Liver (CASL)
- Canadian Institutes of Health Research
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Background & Aims: Significance of diastolic dysfunction in cirrhotic cardiomyopathy has been brought to the forefront with several reports of unexpected heart failure following liver transplantation and transjugular intrahepatic portosystemic stent-shunt, but the etiology remains unclear. The present study investigated the role of passive tension regulators - titin and collagen - in the pathogenesis of this condition. Methods: Cirrhosis was induced by bile duct ligation (BDL) in rats, while controls underwent bile duct inspection with no ligation. Four weeks after operation, cardiac mRNA and protein levels of titin, collagen, and protein kinase A (PKA) were determined. Diastolic function was examined in isolated right ventricular cardiomyocytes, while passive tension was examined in right ventricular trabeculae muscles. Results: In BDL animals, diastolic return velocity was significantly decreased, relaxation time increased and passive tension increased. However, no significant difference in mRNA and protein levels of titin was observed. PKA mRNA and protein levels were significantly decreased in BDL animals. Collagen levels were also significantly altered in the BDL group. Conclusions: Therefore, diastolic dysfunction exists in cirrhosis with alterations in titin modulation, PKA levels, and collagen configuration contributing to the pathogenesis of this condition. (C) 2011 European Association for the Study of the Liver. Published by Elsevier B. V. All rights reserved.
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