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    Sitagliptin Alleviates Radiation-Induced Kidney and Testis Degeneration in Rats
    (Multidisciplinary Digital Publishing Institute (MDPI), 2025) Celik, Huseyin; Temelli, Oztun; Ozhan, Onural; Taslidere, Elif; Dogru, Feyzi
    Background: Radiation-induced tissue degeneration is the most important side effect of radiotherapy. Sitagliptin with its anti-inflammatory and antioxidant capacity was tested in alleviating the radiation-induced cellular degeneration in kidney and testis tissues. Methods: Wistar albino rats were divided into four groups as control, radiation (RT), radiation + sitagliptin (RT + SGT), and sitagliptin + radiation (SGT + RT). The RT group received 8 Gy radiation. Sitagliptin was applied per os at a 10 mg/kg dose for 14 days to the SGT groups either after or before radiation. Results: Radiation induced marked oxidative stress in kidney and testis tissues, whereas sitagliptin partially restored several antioxidant parameters in the kidney and reduced MDA levels in the testis. Histologically, radiation caused degenerative changes in the renal tubules and glomerulus and the testicular seminiferous tubules, while sitagliptin treatment attenuated these changes in both organs. Caspase-3 expression increased significantly after radiation treatment in the kidney without substantial improvement by sitagliptin; however, VEGF expression, which was markedly reduced by radiation in both tissues, was restored in sitagliptin-treated groups. FGF expression suppressed in all irradiated groups as compared to the control with no significant differences among them. Conclusions: Overall, the results indicated that sitagliptin can be used to attenuate the degenerative effects induced by radiation. Sitagliptin use after radiation as compared to the before use showed significantly better results especially in the kidney tissue. © 2025 by the authors.