Selenium. Mechanistic aspects of anticarcinogenic action

Area of Science:

• Biochemistry
• Cell Biology
• Nutritional Science

Background:

• Selenium is recognized for its anticarcinogenic properties.
• Its protective functions extend beyond glutathione peroxidase.
• Mechanisms vary with selenium dosage, chemical form, and carcinogenic stress.

Purpose of the Study:

• To elucidate the multifaceted mechanisms of selenium's anticarcinogenic activity.
• To explore selenium's role in cellular redox regulation and growth modulation.
• To understand selenium's interactions with cellular processes and environmental factors.

Main Methods:

• Review of existing literature on selenium's biological functions.
• Analysis of selenium's proposed role as a "redox switch" in protein regulation.
• Examination of selenium's influence on intracellular glutathione (GSH), cellular respiration, and DNA protection.

Main Results:

• Selenium prevents malignant transformation by catalyzing redox reactions of SH groups.
• It modulates cell growth via GSH levels and oxygen supply, often stimulating respiration.
• Selenium inhibits tumor virus replication, oncogene activation, and protects DNA from damage.
• Additional roles include methyl group acceptance, detoxification, and immunopotentiation.
• High concentrations can induce cytotoxicity through protein and DNA synthesis inhibition.

Conclusions:

• Selenium exhibits diverse anticarcinogenic mechanisms, including redox regulation, growth modulation, and DNA protection.
• Its efficacy is dependent on dosage, chemical form, and interactions with cellular and environmental factors.
• Optimizing selenium's anticarcinogenic potential requires minimizing exposure to antagonistic substances.