IRAG working group 5. Other assays. Interagency Regulatory Alternatives Group

Area of Science:

• Toxicology
• Ocular toxicology
• In vitro testing

Background:

• The Interagency Regulatory Alternatives Group (IRAG) program aims to advance non-whole animal testing methods.
• Evaluating the current state of alternative eye irritation tests is crucial for regulatory science.

Purpose of the Study:

• To review and assess the utility of various in vitro eye irritation assays.
• To determine the predictive performance of alternative assays against in vivo data.

Main Methods:

• Submissions of in vitro eye irritation data from academic and industrial labs were reviewed.
• Assays included EYTEX, tissue equivalents, cytotoxicity, and Microtox.
• Data analysis involved regression and correlation coefficients against Draize-scored in vivo data.

Main Results:

• Working Group 5 evaluated the submitted in vitro eye irritation assay data.
• In vivo data variability presented challenges in drawing firm conclusions.
• Most reviewed assays demonstrated utility for specific chemical classes.

Conclusions:

• Alternative in vitro eye irritation assays can be useful for screening purposes.
• These assays can supplement other toxicological information for risk assessment.
• Further validation is needed, considering limitations with certain chemical classes.