The anti-fibrotic effect of green tea with a high catechin content in the galactosamine-injured rat liver.

Previously, we reported that the oral administration of green tea rich in catechins restored levels of several biomarkers increasing in galactosamine-treated rats to nearly control values. These biomarkers included serum transaminase activities, serum concentrations of tumor necrosis factor-alpha and interleukin 1-beta, and the hepatic mRNA expression of these inflammatory cytokines. In the present study, we examined possible anti-fibrotic effects of green tea in galactosamine-induced hepatitis. The results of the reverse transcription and polymerase chain reaction indicated that the increase in gene expression of the alpha1 chain of collagen type 1 and transforming growth factor beta-1 in the injured liver 24 h post-injection of galactosamine was suppressed by the administration of green tea. Masson's trichrome staining demonstrated that the extent of fibrogenesis after 14 days was greater in the galactosamine-injured livers not treated with green tea than the treated ones. These results suggest that the drinking of green tea with a high catechin content may help to prevent and/or attenuate the development of fibrosis in hepatitis.