Resveratrol (RES) is a well-known polyphenol antioxidant. We have previously shown that testicular protective effect of RES against the anticancer drug methotrexate (MTX)-induced toxicity involves transporter-mediated mechanisms. Here, we investigated the effect of RES on MTX-induced nephrotoxicity. Rats were administered RES (10 mg/kg/day) for 8 days, with or without a single MTX dose (20 mg/kg i.p.) at day 4 of the experiment. MTX induced nephrotoxicity, as evidenced by a significant increase in serum blood urea nitrogen and creatinine compared to the control, as well as distortion of kidney microscopic structure. MTX also significantly increased renal nitric oxide level along with inducible nitric oxide synthase, fas ligand, and caspase 3 expressions. Administering RES prior to MTX significantly improved kidney function and microscopic picture and also significantly decreased nitrosative and apoptotic markers compared to MTX alone. RES, but not MTX, caused a significant increase in expression of breast cancer resistance protein (BCRP), an apical efflux renal transporter that participates in urinary elimination of both MTX and RES. Interestingly, concomitant MTX and RES caused further upregulation of renal BCRP compared to RES alone. Using Human BCRP ATPase assay, both RES and MTX exhibited a dose-dependent increase in ATPase activity, with Km values of 0.52 ± 0.03 and 30.9 ± 4.2 μm, respectively. Furthermore, combined RES and MTX caused ATPase activity which was significantly less than maximum ATPase activity attained by the positive control, sulfasalazine (12.5 μm). In conclusion, RES exerted nephroprotection against MTX-induced toxicity through antinitrosative and anti-apoptotic effects, as well as via upregulation of renal BCRP.
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