THE EFFECT OF CURCUMIN ON THE PROLIFERATION AND EXTRACELLULAR MATRIX PRODUCTION IN ETHANOL-INDUCED HEPATIC STELLATE CELLS
Keywords:Curcumin, Nil, Tissue inhibitor of metalloproteinases-1, Type 1 collagen
Objectives: In various liver disease models, including those for alcoholic liver diseases, curcumin, a polyphenolic compound derived from
Curcuma longa, is known to have an hepatoprotective effect. However, the mechanism of action underlying its effects on alcohol-induced hepatic
fibrosis remains unknown. We aimed to investigate the mechanisms of action underlying the effects of curcumin, mainly involving the transforming
growth factor (TGF)-β/Smad pathway.
Methods: Hepatic stellate cells (HSCs), LX2, were incubated with 50 mM ethanol with or without curcumin (1 and 10 μM). Viable HSCs were counted
using a LUNATM automated cell counter, whereas the expressions of TGF-β, Smad3, tissue inhibitor of metalloproteinases-1 (TIMP-1), and type 1
collagen mRNA were measured using quantitative reverse transcriptase polymerase chain reactions.
Results: Curcumin significantly suppressed ethanol-induced HSCs proliferation. The antiproliferative effect of curcumin appeared to be dose
dependent. In addition, the mRNA expressions of TGF-β, Smad3, TIMP-1, and type 1 collagen decreased in the cells treated with curcumin.
Conclusion: Curcumin seems to attenuate ethanol-induced HSCs proliferation through the suppression of TGF-β and appears to reduce the production
of extracellular matrix as shown by the decreased expression of type 1 collagen.
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