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Effects of selenium on quartz-induced cytotoxicity in macrophages
Abstract:
Guinea pig peritoneal macrophages were incubated in vitro with various concentrations of selenium (as sodium selenite), quartz, and quartz + selenite. Cellular viability, adhesiveness, migration, and lipid peroxide content as parameters for cytotoxicity were studied. A dose-dependent cytotoxic response of macrophages to selenite was observed. Selenite concentrations of 10(-6), 10(-5), and 10(-4) M were shown to be nontoxic in the various test procedures. Quartz treatment of macrophages reduced cell viability, adhesiveness, and migration, and enhanced lipid peroxide release. Cotreatment of macrophages with nontoxic selenite concentrations suppressed significantly the cytotoxic effects induced by quartz and was effective in reducing the high rate of lipid peroxidation. The results provide support for the role of selenium in the stabilization of macrophage membrane damaged by quartz.
Insights
Selenium (as sodium selenite) protects guinea pig macrophages from quartz-induced damage. Nontoxic selenium concentrations suppressed quartz cytotoxicity, reducing lipid peroxidation and stabilizing cell membranes.
Area of Science:
- Environmental toxicology
- Cell biology
- Inorganic chemistry
Background:
- Macrophages are crucial immune cells susceptible to environmental toxins.
- Quartz exposure can induce cellular damage and oxidative stress.
- Selenium's role in mitigating toxicant effects requires further investigation.
Purpose of the Study:
- To investigate the protective effects of selenium against quartz-induced cytotoxicity in guinea pig macrophages.
- To evaluate selenium's impact on macrophage viability, adhesion, migration, and lipid peroxidation.
Main Methods:
- In vitro incubation of guinea pig peritoneal macrophages with varying concentrations of sodium selenite and quartz.
- Assessment of cellular viability, adhesiveness, and migration.
- Measurement of lipid peroxide content as an indicator of oxidative stress.
Main Results:
- Sodium selenite exhibited a dose-dependent cytotoxic response at higher concentrations.
- Quartz exposure significantly reduced macrophage viability, adhesion, and migration, while increasing lipid peroxidation.
- Nontoxic selenite concentrations effectively counteracted quartz-induced cytotoxicity and suppressed lipid peroxidation.
Conclusions:
- Selenium plays a protective role in stabilizing macrophage membranes damaged by quartz exposure.
- Nontoxic levels of selenium can mitigate the adverse effects of silica particles on immune cells.
- These findings highlight selenium's potential as a therapeutic agent against environmental particulate toxicity.
