Four groups of Swiss albino male mice (CD-1 strain) were used as follows: control group; thioacetamide group (received 100 mg/kg thioacetamide, ip injection, 3 times/week for 8 weeks); thioacetamide plus 17-AAG groups (received 100 mg/kg thioacetamide, ip injection, 3 times/week for 8 weeks plus 25 or 50 mg/kg 17-AAG, ip injection, 5 days/week along the last 4 weeks). Fibrosis was quantified by measuring hydroxyproline level and by morphometry and oxidative stress biomarkers were assigned. Relative hepatic mRNA expressions of α-smooth muscle actin (α-SMA), collagen-1-alpha-1 (Col1A1) and tissue inhibitor metalloproteinase-1 (TIMP-1) mRNAs were measured by RT-PCR. Levels of the apoptotic markers caspase-3, factor related apoptosis (Fas) and Hsp-90 were assigned in tissue homogenate.
17-AAG (50 mg/kg) significantly decreased fibrosis percentage significantly (p < 0.001, 0.05) compared to thioaceatmide and 25 mg/kg, respectively. Malondialdehyde, Hsp90, α-SMA, Col1A1 and TIMP-1 expression levels were significantly reduced (p < 0.05) by the inhibitor large dose. Levels of GSH, caspase-3 and Fas were markedly (p < 0.001) increased in the group received 17-AAG (50 mg/kg) compared to other groups.
The Hsp90 inhibitor, 17-AAG, can attenuate thioacetamide hepatotoxicity through oxidative stress counterbalance, reducing stellate cells activity and inducing apoptosis.