Protective Effect of Biochanin A on Gamma Radiation‐Induced Oxidative Stress, Antioxidant Status, Apoptotic, and DNA Repairing Molecules in Swiss Albino Mice.

Radiation therapy is indispensable in medical practice but often causes adverse effects on healthy tissues, necessitating the search for natural radioprotectors. This study investigates the protective effect of Biochanin A (BCA) against gamma radiation‐induced oxidative stress and DNA damage in Swiss albino mice. Gamma radiation, a potent ionizing source, generates reactive oxygen species (ROS) that damage cellular biomolecules, including DNA. Antioxidants play a crucial role in neutralizing ROS and preventing oxidative damage. Swiss albino mice were divided into control, BCA control (10 mg/kg body weight), radiation alone (7 Gy), and radiation+ BCA pretreatment groups. BCA, a natural isoflavone with known antioxidant and cytoprotective properties, was administered intraperitoneally before radiation exposure. After irradiation, lipid peroxidation levels, antioxidant enzyme activities/level (superoxide dismutase, catalase, glutathione peroxidase and reduced glutathione), expression levels of DNA repair genes (P53, P21, GADD45α), apoptotic markers (Bax, Bcl‐2, Caspase‐3, ‐9 and Cytochrome‐C), and inflammatory marker (NF‐κB) were analyzed in small intestine tissue. Our findings indicate that gamma radiation significantly elevated lipid peroxidation levels and altered antioxidant enzyme activities, indicating oxidative stress. However, BCA pretreatment mitigated these effects by bolstering antioxidant defences, reducing radiation‐induced oxidative damage. Additionally, BCA altered apoptotic markers, NF‐κB expression, promoting cell survival mechanisms. At the molecular level, BCA pretreatment upregulated key DNA repair genes (P53, P21, GADD45α), crucial for repairing radiation‐induced DNA damage and maintaining genomic stability. These results underscore BCA potential as a radioprotector, suggesting its efficacy in mitigating radiation‐induced oxidative stress and preserving cellular integrity. In conclusion, BCA demonstrates promising radioprotective properties by attenuating oxidative stress, enhancing antioxidant defences, modulating apoptotic pathways, and promoting DNA repair mechanisms following gamma radiation exposure. Further research is necessary to elucidate its precise mechanisms of action and explore its potential therapeutic applications in radiation oncology and environmental radioprotection. Summary: The radioprotective effect of BCA in mitigating the gamma radiation‐induced biochemical, apoptosis, and DNA repairing gene modification in mice. These effects may be immunomodulatory by enhancing antioxidant status and inhibiting the lipid peroxidative markers in spleen tissue. Further, BCA increased hematological parameters, inhibit proapoptotic and promoted antiapoptotic proteins, and decreased the DNA repair gene expression in spleen tissue. Thus, BCA acts as a radioprotector and will be treated in cancer patients exposed to radiotherapy. [ABSTRACT FROM AUTHOR]