“Hepatic cardiomyopathy, a special type of heart failure develops in up to 50% of patients with cirrhosis and is a major determinant of survival. However, there is no reliable model of hepatic cardiomyopathy in mice. Herein we aimed to characterize the detailed hemodynamics of mice with bile-duct ligation (BDL)-induced liver fibrosis, by monitoring echocardiography and intracardiac pressure-volume (PV) relationships and myocardial structural alterations. Treatment of mice with a selective cannabinoid-2 receptor (CB2 -R) agonist, known to attenuate inflammation and fibrosis, was used to explore the impact of liver inflammation, fibrosis on cardiac function.
MAIN RESULTS:
BDL induced massive inflammation (increased leukocyte infiltration, inflammatory cytokines and chemokines), oxidative stress, microvascular dysfunction, and fibrosis in the liver. These pathological changes were accompanied by impaired diastolic, systolic and macrovascular functions, cardiac inflammation (increased MIP1, interleukin-1, P-selectin, CD45+ cells) and oxidative stress (increased malondialdehyde, 3-nitrotyrosine and NADPH-oxidases). CB2 -R up-regulation was observed both in livers and hearts of mice exposed to BDL. CB2 -R activation markedly improved hepatic inflammation, impaired microcirculation, fibrosis. CB2 -R activation also decreased serum TNF-alpha levels, and improved cardiac dysfunction, myocardial inflammation and oxidative stress underlining the importance of inflammatory mediators in the pathology of hepatic cardiomyopathy.
CONCLUSION:
We propose BDL-induced cardiomyopathy in mice as a model for hepatic/cirrhotic cardiomyopathy. This cardiomyopathy, similarly to cirrhotic cardiomyopathy in humans, is characterized by systemic hypotension, impaired macro- and microvascular function accompanied by both systolic and diastolic dysfunction. Our results indicate that the liver-heart inflammatory axis has a pivotal pathophysiological role in the development of hepatic cardiomyopathy. Thus, controlling liver and/or myocardial inflammation (e.g. with selective CB2-R agonists) may delay/prevent the development of cardiomyopathy in severe liver disease. ”
https://www.ncbi.nlm.nih.gov/pubmed/31469200
https://aasldpubs.onlinelibrary.wiley.com/doi/abs/10.1002/hep.30916
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