Arsenic and selenium toxicity and their interactive effects in humans

Area of Science:

• Environmental toxicology
• Metallomics
• Cancer research

Background:

• Arsenic (As) and selenium (Se) are metalloids with paradoxical effects on cancer, capable of both inducing and curing it.
• Both metalloids contribute to carcinogenesis, pathology, cytotoxicity, and genotoxicity, with reactive oxygen species implicated in their mechanisms.

Purpose of the Study:

• To review the toxicity mechanisms of arsenic and selenium.
• To elucidate the complex interactions between arsenic and selenium toxicity.
• To propose future research directions for understanding these metalloids' effects.

Main Methods:

• Literature review of arsenic and selenium toxicity mechanisms.
• Analysis of molecular interactions, including glutathione and S-adenosylmethionine pathways.
• Examination of As-Se complex formation and its implications.

Main Results:

• Arsenic (As) toxicity involves decreased DNA methylation and altered p53 expression.
• Selenium (Se) toxicity involves modification of thioredoxin reductase.
• A hypothesized As-Se complex formation influences toxicity: low Se may decrease As toxicity via excretion, while high Se may enhance As toxicity.

Conclusions:

• The interaction between arsenic and selenium is concentration-dependent.
• Understanding these metalloid interactions is crucial for managing their dual roles in health and disease.
• Further investigation is needed to fully characterize the mechanisms and therapeutic potential of As-Se interactions.