Cellular stress response pathway system as a sentinel ensemble in toxicological screening

Area of Science:

• Toxicology and Pharmacology
• Cellular Biology
• Biochemistry

Background:

• High costs, long testing times, and ethical concerns necessitate alternative toxicological evaluation methods.
• Current in vitro assays for drug discovery are highly effective but limited for broad toxicological screening due to the myriad of potential chemical interactions.
• Xenobiotics can exhibit toxicity through diverse, often undefined, cellular interactions, making targeted assays insufficient.

Purpose of the Study:

• To propose an integrative approach for rapid and cost-effective toxicological evaluation of chemical compounds.
• To explore the utility of cellular stress response pathways as a basis for a set of high-throughput in vitro assays.
• To enable the clustering of chemicals by biological response profiles and inferring toxicant mechanisms of action (MOA).

Main Methods:

• Review of the biochemical characteristics, architecture, and cross-talk of major cellular stress response pathways.
• Development of high-throughput cell-based assays utilizing components of these well-characterized pathways.
• Application of an ensemble screening approach using these stress pathway assays.

Main Results:

• Cellular stress response pathways provide a manageable set of targets for integrative toxicological assays.
• The stress pathway ensemble approach allows for the potential clustering of chemicals based on common modes of action.
• This strategy can facilitate the inference of specific toxicant mechanisms of action from biological activity profiles.

Conclusions:

• An ensemble of cellular stress response pathway-based assays offers a viable solution for rapid and cost-effective toxicological screening.
• This approach can identify toxic interactions and provide insights into the mode of action of chemicals.
• The stress assay concept shows potential for application in noninvasive in vivo assessments of chemical toxicants.