Abstract

Objective: Methotrexate (MTX) is a commonly used chemotherapeutic agent in clinical oncology practice and in treatment of autoimmune diseases. The major side effect during treatment is mucositis. Recently published studies reported that this effect may be due to direct intestinal epithelial injury and disturbance of intestinal microbiota. In this study, we aimed to characterize the intestinal histological changes caused by MTX and to investigate the effects and safety of Sildenafil and probiotic Bacillus clausii on intestinal mucositis in a rat model. Materials and Methods: The rats were divided in 4 groups; Group1(n=8) received MTX + B. clausii, Group 2 (n=8) received only MTX, Group3 (n=8) received MTX + Sildenafil and Group 4 (n=7) was served as control (received no treatment). Results: The rate of villus atrophy, villous fusion and erosion in the MTX + B. clausii group were found to be statistically significantly lower than in the MTX group and the MTX + Sildenafil group. Conclusion: The study demonstrated the effect of B. clausii on repairing of intestinal mucosa after MTX-treatment. The better understanding of the effects of probiotics on intestinal mucosal protection may lead to new therapeutic approaches in chemotherapy-induced mucositis.

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