Toxicity of anionic detergents determined by Saccharomyces cerevisiae microarray analysis

Area of Science:

• Environmental toxicology
• Molecular biology
• Biochemistry

Background:

• Sodium n-dodecyl benzene sulfonate (LAS) and sodium dodecyl sulfate (SDS) are widely used anionic detergents.
• Previous studies have characterized the general toxicities of LAS and SDS.

Purpose of the Study:

• To investigate the molecular mechanisms of LAS and SDS toxicity using DNA microarray bioassays.
• To compare the toxicological profiles of LAS and SDS with other known toxicants.

Main Methods:

• Application of LAS and SDS in a DNA microarray bioassay.
• Analysis of mRNA expression profiles to identify cellular responses.
• Hierarchical clustering to compare toxicity patterns.

Main Results:

• Microarray data confirmed known toxicities and revealed new insights into LAS and SDS effects.
• LAS and SDS were found to damage membranes, alter carbon metabolism, and induce oxidative stress.
• Both detergents activated the pleiotropic drug-resistance network in yeast cells, suggesting a role in efflux.
• Toxicity profiles of LAS and SDS were similar to capsaicin but distinct from cadmium and mercury.

Conclusions:

• LAS and SDS induce overlapping molecular responses, including membrane damage, metabolic alterations, and oxidative stress.
• The pleiotropic drug-resistance network is implicated in the cellular response and potential detoxification of LAS and SDS in yeast.
• Comparative analysis reveals distinct toxicological signatures for different chemical classes.