The Pin1 inhibitor, juglone, prevented renal tissue against I/R injury in rats. The model was established with 45 min ischemia and then 24 h reperfusion. (a, b) The effect of juglone at different concentrations (2 mg/kg, 10 mg/kg) on the Cr and BUN levels in the sham group. (c, d) The effect of juglone at different concentrations (2 mg/kg, 10 mg/kg) on the Cr and BUN levels in the I/R group. (e, f) The effect of juglone at different concentrations (2 mg/kg, 10 mg/kg) on Pin1 expression in rats and the quantification. (g, h) The effect of juglone at different concentrations (2 mg/kg, 10 mg/kg) on the structure change was examined by H&E staining and its quantification (×400). (i) The effect of juglone on oxidative stress was examined by DHE staining (×400) (n = 5). The values were presented as mean ± SEM. ∗P < 0.05 vs. the sham group and #P < 0.05 vs. the I/R group.