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Repositioning of molsidomine for its efficacy in diabetes induced erectile dysfunction in rats: In silico, in vitro and in vivo approach.

BACKGROUND: Well known risk factors for diabetic erectile dysfunction include impaired nitric oxide synthesis and endothelial dysfunction. We proposed to evaluate the efficacy of nitric oxide donor, molsidomine in rat model of diabetic erectile dysfunction.

METHODS: Streptozotocin (52mg/kg, ip) induced diabetic male rats were treated with molsidomine (5 and 10mg/kg, po) for 8 weeks. The sexual behaviour of male rat in presence of the female rat in oestrous phase was observed at the end of study. The effect of treatment on serum testosterone level, sperm parameters and penile tissue histopathology was also evaluated. Further anti-inflammatory activity and antioxidant potential of molsidomine was evaluated by in vitro method. In silico docking study was carried out to appreciate binding conformation of the molsidomine to its plausible target, phosphodiesterase enzyme.

RESULTS: Molsidomine significantly and dose dependently increased sexual behaviour, sperm count and serum testosterone level in diabetic rats. Further, the protective effect of molsidomine was also substantiated by pathological changes in the architect of the penile tissue. Molsidomine showed good membrane stability accounting for its significant anti-inflammatory action and also significantly scavenged DPPH radical activity showing its antioxidant action. Molsidomine was found to settle well in the active site of PDE-5 enzyme with less binding affinity than the standard drug sildenafil.

CONCLUSION: The results highlight the rationale behind the repositioning of molsidomine therapy for the management of diabetic erectile dysfunction.

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