Oxidative stress has been proven to be involved in cisplatin (CP)-induced toxicity. The present study was
designed to evaluate the antioxidant activity of Vit C, N,N0-diphenyl-p-phenylenediamine (DPPD) and Lcysteine
against CP-induced testicular oxidative damage in rats. Our data indicated significant increases
in lipid peroxides (LPO), total peroxides and superoxide anion levels in testes of rats treated with CP
(2 mg/kg/week, for 4 weeks) that was associated with a significant reduction in the activity of the antioxidant
enzymes superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST). The
contents of glutathione (GSH), Vit E and Vit C were significantly lower in CP treated testes compared with
these of control. The co-administration of CP with DPPD or L-cysteine significantly reduced the elevation
in LPO, however the co-administration of CP with Vit C, DPPD or L-cysteine reduced the effect of CP on
superoxide anion and antioxidant enzymes and also on the antioxidants contents. The administration
of Vit C, DPPD or L-cysteine before CP injection improved the histological pictures and reduced the number
of apoptotic cells and DPPD was more efficient. In conclusion, DPPD is a potent antioxidant, against
CP-induced testicular oxidative damage, as compared with Vit C and L-cysteine.