p66ShcKO restored renal microvascular responses in diabetic rats. A: Comparison of afferent arteriole diameters in SS, p66ShcKO, and p66Shc-S36A rats before and after induction of STZ-induced DN. #P < 0.05 vs. SS rats; *P < 0.01 vs. STZ-treated SS rats. B: Effect of pinacidil. Pinacidil resulted in a greater increase in afferent arteriolar diameter in SS rats with STZ-induced DN than in p66ShcKO rats with STZ-induced diabetes and p66Shc-S36A rats with STZ-induced diabetes. Values in untreated SS rats, p66ShcKO rats, and p66Shc-S36A rats are also shown. C: Effect of glibenclamide. Glibenclamide resulted in a greater decrease in afferent arteriolar diameter in SS rats with STZ-induced DN than in p66ShcKO rats with STZ-induced diabetes and p66Shc-S36A rats with STZ-induced diabetes. Values in untreated SS rats, p66ShcKO rats, and p66Shc-S36A rats are also shown. For panels B and C, *P < 0.01 vs. SS rats; †P < 0.05 vs. STZ-treated SS rats.