The effects of sildenafil and n-acetylcysteine on ischemia and reperfusion injury in gastrocnemius muscle and femoral artery endothelium

Purpose We aimed to examine the effects of sildenafil and n-acetylcystein on ischemia/reperfusion injury in femoral artery endothelium and gastrocnemius muscle. Basic methods 32 rats of Sprague-Dawley breed were randomly divided into four groups (n = 8). Median laparotomy was performed, then a 120-minute ischemia was created by microvascular clamping of infrarenal aorta, followed by the release of clamping. In sildenafil group, 1 mg/kg of sildenafil infusion and in the n-acetylcystein group, 100 mg/kg of n-acetylcystein infusion was administered after release of clamps. Blood samples and tissue samples of femoral artery and gastrocnemius muscle were extracted for a histopathological evaluation. Principal findings Serum levels of malondialdehyde in ischemia/reperfusion group (6.16 ± 0.79) were higher compared to the control group (4.69 ± 0.33), whereas a significant decrease was detected in sildenafil (5.17 ± 0.50) and n-acetylcystein (4.96 ± 0.49) groups. Femoral artery tissue sections of the control group, mean tumor necrosis factor alpha and hypoxy-induced factor-1 alpha immunoreactivity were found to be negative. In the ischemia/reperfusion group, mean tumor necrosis factor α immunoreactivity was intense and mean hypoxy-induced factor-1 alpha immunoreactivity was 51–75%. In the ischemia/reperfusion + Sildenafil and ischemia/reperfusion + NAS groups, mean tumor necrosis factor α immunoreactivity was slight and mean hypoxy-induced factor-1 alpha immunoreactivity was 26–50%. Conclusions In conclusion, sildenafil and n-acetylcystein may reduce femoral artery endothelium and gastrocnemius muscle injury following lower extremity ischemia/reperfusion.