Repaglinide inhibits cyclosporine A-induced renal tubular toxicity by affecting apoptosis and Bax and Bcl-2 expression

Abstract

Background/aim: Repaglinide (RG) is a prandial glucose regulator used for the treatment of type 2 diabetes. Our recent study showedthat RG plays an important role in cyclosporine A (CsA)-induced nephrotoxicity through its antioxidant properties. However, it isnot known whether or not RG has any protective effect on CsA-induced renal tubular toxicity by affecting apoptosis and expression ofapoptosis-associated protein. The purpose of this study was to investigate the effects of RG on CsA-induced renal tubule apoptosis andBax and Bcl-2 protein expression in rats.Materials and methods: Forty male Sprague Dawley rats weighing 250–300 g were randomly divided into four groups: administrationsof olive oil (control, per os (PO)), CsA (30 mg/kg in olive oil, subcutaneous (SC)), and RG (0.2 or 0.4 mg/kg, PO) plus CsA (30 mg/kgin olive oil, SC) every day for 15 days.Results: Our results showed that SC administration of CsA (30 mg/kg) to rats produced marked injury and apoptosis, elevation of Baxprotein expression, and inhibition of Bcl-2 protein expression in the kidneys, which were reversed significantly by oral administrationof RG (0.2 or 0.4 mg/kg).Conclusion: The findings of our study indicate that RG may play an important role in protecting the kidneys through inhibitingapoptosis, Bax, and Bcl-2 protein expression.