Radioprotective Effect of α-Tocotrienol on Radiation-Induced Brain Injury in Rats.

Abstract

Background: In medicine, ionizing radiation can damage cells by generating free radicals, harming healthy tissues during radiotherapy. Radioprotectors help mitigate this damage, but current options often have low efficacy, high cost, or side effects.

Objective: This study aimed to investigate α-Tocotrienol, a vitamin E isomer with antioxidant and anti-cancer properties, as a potential radioprotector for brain radiotherapy patients and radiation workers. While its protective effects on normal brain tissue are promising, its potential impact on tumor cells remains a critical consideration for future studies.

Material and methods: This randomized controlled experimental animal study was conducted on healthy male Wistar rats maintained under standardized laboratory conditions. The animals were randomly divided into groups and pretreated with α-Tocotrienol prior to localized brain irradiation. Following irradiation, brain tissues were harvested and evaluated for histopathological alterations and biochemical markers of oxidative stress.

Results: Pretreated rats with α-Tocotrienol showed fewer nerve cell injuries compared to untreated irradiated rats. Biochemically, irradiated rats had increased malondialdehyde (oxidative stress marker) and decreased antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase), while α-Tocotrienol-treated rats maintained higher enzyme activity.

Conclusion: α-Tocotrienol enhances radiation resistance by boosting antioxidant defenses and reducing neuronal damage. However, given the possibility of parallel protection of tumor cells, its clinical translation requires careful evaluation and optimization. Further studies are needed to determine selective dosing strategies and timing that maximize neuroprotection without compromising tumor control.