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Antiandrogens as environmental endocrine disruptors
W R Kelce1, L E Gray, E M Wilson
1Reproductive Toxicology Division, National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA. wkelce@med.unc.edu
Reproduction, Fertility, and Development
|September 4, 1998
Summary
Environmental chemicals like vinclozolin disrupt male reproductive development by blocking androgen receptor activity. This research explores the molecular mechanisms behind this antiandrogen toxicity.
Area of Science:
- Endocrinology
- Developmental Biology
- Environmental Toxicology
Background:
- Steroid hormone receptors are critical for embryonic development and sex differentiation.
- Hormonal disruptions during development can have severe and lasting consequences.
- Environmental chemicals can interfere with essential hormonal signaling pathways.
Purpose of the Study:
- To investigate the molecular mechanisms by which environmental chemicals disrupt male reproductive development.
- To understand how antiandrogens inhibit androgen receptor-mediated gene transcription.
- To elucidate the basis of environmental antiandrogen toxicity.
Main Methods:
- Utilized a variety of in vitro and in vivo experimental approaches.
- Analyzed the binding affinity of environmental chemicals to the androgen receptor.
- Assessed the antagonistic effects on androgen-dependent gene expression.
Main Results:
- Environmental chemicals, including vinclozolin and DDT metabolites, were identified as inhibitors of androgen receptor function.
- These chemicals bind to the androgen receptor with moderate affinity.
- They act as antagonists, preventing the transcription of androgen-dependent genes.
Conclusions:
- Environmental antiandrogens disrupt male reproductive development by antagonizing the androgen receptor.
- Understanding these molecular interactions is crucial for assessing developmental risks.
- Further research is needed to fully characterize the impact of environmental endocrine disruptors.