Mesenchymal stem cells (MSCs) curative effects on methotrexate (MTX)-induced kidney and liver injuries remain elusive. Therefore, rats were divided into five groups, rats received MTX orally (14 mg/kg) as a single dose/week for 2 weeks, groups 3 and 4 were injected once with 2 × 10 cells bone marrow MSCs and adipose-derived MSCs, respectively. The last group administered dexamethasone (DEX) (0.5 mg/kg, p.o) for 7 days. MTX caused marked increase in malondialdehyde and nitrite/nitrate concentrations. However, MTX administration decreased reduced glutathione content plus catalase activity. In addition, MTX caused a significant increment in kidney and liver biomarkers levels. Moreover, MTX showed renal tubules vacuolation and necrosis of hepatocytes, as well expression of caspase-3 and nuclear factor kappa beta in kidney and liver tissues were observed. MSCs treatment alleviated previous side effects induced by MTX. MSCs improved nephrotoxicity and hepatotoxicity induced by MTX to a better extent as compared with DEX.
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