Sister chromatid exchanges induced by inhaled anesthetics

Area of Science:

• Toxicology
• Anesthesiology
• Genetics

Background:

• Growing evidence suggests anesthetics may possess carcinogenic potential.
• Previous studies identified fluroxene as mutagenic using the Ames test.
• The sister chromatid exchange (SCE) assay is a sensitive method for evaluating mutagenic-carcinogenic potential.

Purpose of the Study:

• To assess the carcinogenic potential of commonly used anesthetics.
• To investigate whether anesthetics induce mutations in mammalian cells.
• To identify specific anesthetic agents or chemical structures associated with mutagenicity.

Main Methods:

• Utilized the sister chromatid exchange (SCE) assay in Chinese hamster ovary cells.
• Exposed cell cultures to 1 MAC concentrations of various anesthetics for one hour.
• Employed a metabolic activating system to mimic in vivo conditions.

Main Results:

• Exposure to nitrous oxide, diethyl ether, trichloroethylene, halothane, enflurane, isoflurane, methoxyflurane, and chloroform did not elevate SCE values.
• Divinyl ether, fluroxene, and ethyl vinyl ether significantly increased SCE values.
• Anesthetics containing a vinyl moiety demonstrated mutagenic activity in mammalian cells.

Conclusions:

• Current anesthetics, except those with vinyl groups, do not appear to be mutagenic carcinogens based on SCE assays.
• Anesthetics with a vinyl moiety warrant further investigation for potential mutagenic-carcinogenic risks.
• The SCE assay provides a valuable tool for screening anesthetic safety.