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In vitro models in endocrine disruptor screening.
1Toxicology & Environmental Research & Consulting, The Dow Chemical Company, Midland, MI, USA.
ILAR Journal
|September 30, 2004
Summary
Chemicals in our environment and diet can disrupt hormones, raising global concerns. The Endocrine Disruptor Screening and Testing Advisory Committee (EDSTAC) proposed tiered testing, now advanced by a validation subcommittee for key assays.
Area of Science:
- Environmental Science
- Toxicology
- Endocrinology
Background:
- Growing public and scientific concern over endocrine-disrupting chemicals (EDCs) in diet and environment.
- International recognition of EDCs as a significant issue impacting human and wildlife health.
- Previous recommendations by the Endocrine Disruptor Screening and Testing Advisory Committee (EDSTAC) for a tiered testing approach.
Purpose of the Study:
- To review the methodologies and validation status of in vitro assays proposed by EDSTAC.
- To support the Environmental Protection Agency (EPA) in validating assays for endocrine disruptor screening.
- To address the evaluation of estrogen, androgen, and thyroid-related effects of commercial chemicals.
Main Methods:
- Discussion of four proposed in vitro mammalian assays.
- Focus on estrogen/androgen receptor binding assays.
- Inclusion of estrogen/androgen gene transactivation, minced testis, and placental aromatase assays.
Main Results:
- The EDSTAC proposed a battery of in vitro assays for screening.
- Validation status of these proposed assays is currently under review.
- The Endocrine Disruptor Methods Validation Subcommittee advises on assay conduct.
Conclusions:
- The tiered testing strategy recommended by EDSTAC is being implemented.
- Validation of in vitro assays is crucial for effective endocrine disruptor screening.
- Continued scientific and technical input is vital for the EPA's program.