Chromosome damage induced by selenium salts in human peripheral lymphocytes

Area of Science:

• Toxicology
• Cell Biology
• Genetics

Background:

• Selenium is an essential trace element with varying biological effects depending on its chemical form and concentration.
• Inorganic selenium compounds, such as sodium selenite and sodium selenate, are used in various applications, necessitating an understanding of their cellular impact.
• Human lymphocytes are a valuable model for assessing genotoxicity and cytotoxic effects in vitro.

Purpose of the Study:

• To evaluate the in vitro cytotoxic and genotoxic effects of sodium selenite and sodium selenate on human peripheral blood lymphocytes.
• To determine the dose-response relationship of these selenium salts on cell division and chromosomal integrity.
• To compare the clastogenic potential of sodium selenite versus sodium selenate.

Main Methods:

• Human peripheral blood lymphocytes were cultured in vitro.
• Cultures were exposed to varying concentrations of sodium selenite and sodium selenate.
• Cell division (blast cell formation) and chromosomal aberrations were analyzed.
• Mitostatic and clastogenic effects were quantified in a dose-dependent manner.

Main Results:

• High concentrations of sodium selenite and sodium selenate were lethal to lymphocytes, inhibiting blast cell formation.
• Lower concentrations exhibited mitostatic effects, significantly reducing cell division.
• Both selenium salts induced chromosomal aberrations and reduced cell division in a dose-dependent manner.
• Sodium selenite demonstrated significantly higher clastogenic activity compared to sodium selenate.

Conclusions:

• Sodium selenite and sodium selenate exhibit significant dose-dependent toxicity to human lymphocytes in vitro.
• Sodium selenite is a more potent inducer of chromosomal aberrations (clastogenicity) than sodium selenate.
• These findings highlight the importance of selenium compound form and concentration in determining cellular toxicity and genotoxicity.