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Embryotoxicity induced by diethylstilbestrol in vitro
B K Beyer1, J C Greenaway, A G Fantel
1Department of Pharmacology, School of Medicine, University of Washington, Seattle 98195.
Journal of Biochemical Toxicology
|January 1, 1987
Summary
Diethylstilbestrol (DES) causes significant embryotoxicity in rat embryos, leading to developmental abnormalities and reduced growth. This effect appears direct, not mediated by estrogenicity or P-450 metabolites.
Area of Science:
- Developmental toxicology
- Embryology
- Pharmacology
Background:
- Diethylstilbestrol (DES) is a synthetic estrogen with known teratogenic effects.
- Understanding the mechanisms of DES embryotoxicity is crucial for risk assessment.
Purpose of the Study:
- To investigate the embryotoxic potential of DES using a whole embryo culture system.
- To explore the role of P-450 bioactivation and other metabolic pathways in DES-induced embryotoxicity.
Main Methods:
- Rat embryos (day 10) were cultured for 24 hours with varying concentrations of DES.
- Assessed embryonic growth parameters, viability, and specific toxicological endpoints.
- Investigated the influence of exogenous P-450 system, carbon monoxide, arachidonic acid, indomethacin, antioxidants, and tamoxifen.
Main Results:
- DES exhibited concentration-dependent embryotoxicity, with lethality above 0.26 mM.
- At 0.19 mM, DES caused significant embryotoxicity including neural tube defects and growth retardation.
- P-450 system, CO, prostaglandin synthase, and antioxidants did not mitigate DES toxicity; tamoxifen enhanced it.
Conclusions:
- DES exerts direct embryotoxic effects independent of estrogenicity or P-450-mediated metabolism.
- The mechanism of DES embryotoxicity does not involve prostaglandin synthase.
- Tamoxifen may potentiate DES-induced developmental toxicity.