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Pirfenidone (esbiret) is an established anti-fibrotic and anti-inflammatory drug used to treat idiopathic pulmonary fibrosis. In the present study, the dose-dependent effects of pirfenidone on the cell cycle, proliferation and expression of heat shock protein (HSP)-47 and collagen type I in a cultured rat hepatic stellate cell line (HSC-T6) were investigated. Following pirfenidone treatment, cell proliferation was determined using the cell counting kit-8 assay and the cell cycle was measured using flow cytometry. HSP-47 expression was estimated using western blot analysis and collagen type I mRNA was assessed using reverse transcription quantitative polymerase chain reaction. Pirfenidone induced significant dose-dependent inhibition of proliferation in HSC-T6 cells. Cell viability was unaffected by treatment with pirfenidone (0, 10 or 100 µM) for 24 and 72 h. However, after 24 h, HSC-T6 cells exhibited dose-dependent decreases in HSP-47 protein and collagen I mRNA levels. In conclusion, pirfenidone inhibited HSC-T6 cell proliferation, arrested the cell cycle and reduced the expression of HSP-47 and collagen type I, indicating that pirfenidone may be a promising drug in the treatment of liver fibrosis.

molecular medicine reports

Pirfenidone inhibits proliferation, arrests the cell cycle, and downregulates heat shock protein-47 and collagen type I in rat hepatic stellate cells in vitro