Mesenchymal stem cells (MSCs) are an ideal adult stem cell with capacity for self-renewal and differentiation with an extensive tissue distribution. The present study evaluates the therapeutic effects of bone marrow mesenchymal stem cells (BM-MSCs) or adipose-derived mesenchymal stem cells (AD-MSCs) against the development of methotrexate (MTX)-induced cardiac fibrosis versus dexamethasone (DEX). Rats were allocated into five groups; group 1, received normal saline orally; group 2, received MTX (14 mg/kg/week for 2 weeks); groups 3 and 4, treated once with 2 × 10 cells of MTX + BM-MSCs and MTX + AD-MSCs, respectively; and group 5, MTX + DEX (0.5 mg/kg, for 7 days, P.O.). MTX induced cardiac fibrosis as marked changes in oxidative biomarkers and elevation of triglyceride, cholesterol, aspartate aminotransferase, gamma-glutamyl transferase, creatine kinase, and caspase-3, as well as deposited collagen. These injurious effects were antagonized after treatment with MSCs. So, MSCs possessed antioxidant, antiapoptotic, as well antifibrotic effects, which will perhaps initiate them as notable prospective for the treatment of cardiac fibrosis.
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