Selenium as an adjuvant for modification of radiation response

Area of Science:

• Radiation biology
• Medical physics
• Nutritional science

Background:

• Ionizing radiation is crucial in medicine and industry but poses risks from accidental exposure.
• High doses, necessary for tumor eradication in radiotherapy, cause severe toxicity in adjacent normal tissues.
• Managing normal tissue toxicity and enhancing tumor cell sensitivity are critical challenges in radiotherapy.

Purpose of the Study:

• To review the radiomitigative and radioprotective effects of selenium on normal cells and tissues.
• To examine the radiosensitizing effects of selenium on cancer cells.
• To explore selenium's potential as an adjuvant agent in radiation therapy and accidental exposure scenarios.

Main Methods:

• Literature review of molecular, cellular, and clinical studies on selenium and radiation.
• Analysis of selenium's impact on cellular antioxidant defense mechanisms, including glutathione (GSH) levels.
• Evaluation of selenium's differential effects on normal versus malignant cells exposed to ionizing radiation.

Main Results:

• Selenium exhibits potent antioxidant and radioprotective effects by upregulating cellular glutathione (GSH) and glutathione peroxidase activity.
• Studies indicate selenium can mitigate radiation toxicity when administered post-exposure, suggesting its utility as a radiomitigator.
• Evidence suggests selenium differentially affects cells, protecting normal tissues while potentially sensitizing tumor cells to radiation.

Conclusions:

• Selenium demonstrates significant potential for ameliorating radiation toxicity in normal tissues.
• Selenium may enhance the efficacy of radiotherapy by sensitizing cancer cells.
• Further clinical investigation is warranted to fully establish selenium's role in radiation medicine and accidental exposure management.