Treatment with the chemotherapeutic agent, doxorubicin (DOX), is limited by nephrotoxicity. We investigated the possible protective effect of infliximab, a tumor necrosis factor alpha (TNF-α) inhibitor on DOX-induced nephrotoxicity. Rats were treated with a single intraperitoneal (ip) injection of DOX (17.5 mg/kg) in the absence or presence of infliximab (5 mg/kg, i.p.). Plasma and urinary markers of kidney function, oxidative stress, and inflammation were measured. Kidney and heart tissue was evaluated histopathologically. DOX-induced nephrotoxicity was confirmed by increased plasma urea, creatinine, cystatin C, neutrophil gelatinase-associated lipocalin (NGAL), and clusterin concentrations. In addition, DOX increased urinary albumin/creatinine ratio, N-acetyl-β-D-glucosaminidase (NAG) activity, kidney injury molecule (KIM-1) concentrations, and reduced creatinine clearance. DOX significantly reduced renal antioxidants and increased plasma inflammatory markers and adiponectin concentrations. Concomitant treatment with infliximab did not significantly affect DOX-induced changes in plasma creatinine, cystatin C, or creatinine clearance. However, infliximab significantly reduced DOX-induced action on plasma urea, NGAL, clusterin, and adiponectin. Infliximab also significantly reduced urinary albumin/creatinine ratio, NAG activity, and KIM-1 concentrations, as well as the occurrence of fibrotic lesions in kidney tissue. Fibrosis detected in the heart was unchanged. In addition, infliximab reduced DOX-induced effects on plasma inflammatory markers, renal superoxide dismutase (SOD) and total antioxidant capacity. Our results show that infliximab is partially effective in mitigating DOX-induced nephrotoxicity in rats.
Keywords: Doxorubicin; Inflammation; Infliximab; Nephrotoxicity; Oxidative stress; TNF-α.