Forskning

July 11, 2013

Caffeine attenuates liver fibrosis via defective adhesion of hepatic stellate cells in cirrhotic model

S G Shim et al, 2013, Caffeine attenuates liver fibrosis via defective adhesion of hepatic stellate cells in cirrhotic model, Journal of Gastroenterology and Hepatology, published online ahead of print. 

ABSTRACT
Background: Several epidemiological studies have shown that coffee intake attenuates the progression of liver fibrosis; however, the mechanism is unclear. Aims: We investigated the direct effects of caffeine on hepatic stellate cells (HSCs), and assessed whether caffeine attenuated intrahepatic fibrosis in rat model of liver cirrhosis. Methods: LX-2, an immortalized human HSCs line, was used in in vitro assay system. Cell migration and proliferation were assessed in presence of various caffeine concentrations (0, 1, 5, and 10 mM), and levels of procollagen type IC and α-SMA were measured by Western blot. Severity of liver inflammation and fibrosis were compared between thioacetamide treated rats with and without caffeine supplementation. Results: Caffeine increased HSCs apoptosis and intracellular F-actin and cAMP expression. Caffeine also inhibited procollagen type IC and α-SMA expression in a dose- and time-dependent manner. In rat model, caffeine decreased periportal inflammation, levels of inflammatory cells (1.4±0.52 vs. 2.6±0.46, p<0.05) and fibrosis (2.1±0.35 vs. 2.9±0.84, p<0.05).TGF-β and α- SMA expressions were also reduced by caffeine. Conclusion: Caffeine attenuates the progression of liver fibrosis by inhibiting HSCs adhesion and activation.