Sildenafil reduces ischemia/reperfusion testicular injury after torsion/detorsion in rats.

This study was conducted to investigate the protective effects of sildenafil citrate on testicular injury after testis torsion/detorsion (T/D) in rats. Forty adult male Wistar rats were randomly allocated into four equal groups of ten rats each. Group 1 (Sham-operated); Group 2 (torsion for 2 hours and detorsion for 2 hours); Group 3, (torsion for 2 hours, sildenafil injection and detorsion for 2 hours), and Group 4 (sildenafil injection, torsion for 2 hours and detorsion for 2 hours).The levels of lipid peroxidation (P<0.001) and nitric oxide (P < 0.01) were significantly increased in in the testis of group 2 rats. Testicular reduced glutathione and serum inhibin B levels were decreased significantly (P<0.001) after T/D. Administration of sildenafil either before or after torsion prevented the increase in lipid peroxidation and nitric oxide, and alleviated glutathione and inhibin B levels. Sildenafil also prevented ischemia/reperfusion cellular damage and histological alterations in testicular tissue. These results suggest that treatment with sildenafil citrate 2 hours before or after torsion could induce protective effects against ischemia/reperfusion injury.

Ruta graveolens and its active constituent rutin protect against diethylnitrosamine-induced nephrotoxicity through modulation of oxidative stress.

The current study was designed to evaluate the possible protective effects of Ruta graveolens (Rue) and its active phenolic constituent rutin against diethylnitrosamine (DEN)-induced nephrotoxicity in rats. A single dose of DEN (200 mg/kg body weight) was intraperitoneally injected. Two-weeks after DEN administration, rats received 0.05 % phenobarbital in drinking water for 12 weeks. Ruta graveolens (50 mg/kg) and rutin (50 mg/kg) were orally administered from the first day of experiment. DEN administration induced kidney injury evidenced by histological alterations as well as significant increase in serum urea (P<0.01), creatinine (P<0.001) and uric acid (P<0.001), and renal lipid peroxidation levels. On the other hand, renal glutathione content and activity of superoxide dismutase, glutathione peroxidase and glutathione-s-transferase were significantly declined. Concomitant supplementation with either R. graveolens extract or rutin markedly alleviated the altered biochemical and histopathological features. In conclusion, the current findings provide evidence that R. graveolens and its active phenolic component rutin could protect against DEN-induced renal damage through abolishment of oxidative stress and potentiation of the antioxidant defense system.