نبذة مختصرة : Background and Objective: Aspartame is a kind of artifical and non-sugar sweetener that is used as a sugar substitute in some foods and beverages. This study was done to determine effect of Aspartam on histomorphometric alterations, kidney function and expression of Bcl2, Bax, Caspase 3, P53 Genes in Mice. Methods: In this experimental study, 36 adult male NMRI mice were allocated into four groups including control group and three experimental groups. The mice in the control group received 0.3 ml of distilled water by oral gavage for 90 days and the experimental groups received 40, 80 and 160 mg/kg aspartame, respectively orally and daily. One day after treatment, blood and kidney tissue samples were taken to evaluate biochemical, histomorphometric alterations and gene expression. Results: Renal capsule diameter, glomerulus diameter and height of the epithelial layer of distal and proximal tubules were significantly reduced in treated groups compared to control group with increasing dosage of aspartame (P
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