Abstract
The aim of the study was to investigate the inhibitory effects of soybean isoflavones (SI) on testicular cell apoptosis in mice with type-2 diabetes, as well as any possible mechanisms of action. Thirty male C57BL/6J mice were randomly divided into the control, diabetic (model), and treatment (SI) groups (n=10 each). After treatment for 20 weeks, testicular cell apoptosis was detected and evaluated using DAPI staining. The expression and distribution of caspase-3 protein in testicular tissues was detected via immunohistochemistry, while caspase-3 mRNA expression was detected using RT-PCR. Bax and Bcl-2 protein expression was detected by western blot analysis. At week 20, DAPI staining showed that SI treatment significantly decreased testicular tissue cell apoptosis in diabetic mice. Immunohistochemical staining revealed that caspase-3 expression in the SI group was significantly reduced relative to the model group. RT-PCR showed that SI treatment significantly decreased caspase-3 mRNA expression relative to the model group. Western blot analysis revealed that SI treatment significantly decreased Bax protein expression and increased Bcl-2 protein expression (P<0.01). SI exhibited an inhibitory effect on testicular tissue cell apoptosis in mice with type 2 diabetes, with this effect possibly mediated by a decreased expression of caspase-3 and Bax and increased Bcl-2 protein expression.
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