Related Experiment Videos
[Transplacental teratogenesis]
1Clinica Ostetrica e Ginecologica, Dipartimento di Scienze Ginecologiche e della Riproduzione Umana, Università di Padova.
Acta Bio-Medica De L'Ateneo Parmense : Organo Della Societa Di Medicina E Scienze Naturali Di Parma
|June 27, 2001
Summary
Exposure to xenobiotics during pregnancy can cause birth defects. Embryos are susceptible due to immature detoxification and repair pathways, leading to teratogenesis from even low chemical exposures.
Area of Science:
- Biochemistry
- Toxicology
- Developmental Biology
Context:
- Pregnancy exposure to xenobiotics (drugs, environmental chemicals) can lead to embryo birth defects.
- Mechanisms underlying teratological susceptibility are not well understood.
- Many embryotoxic xenobiotics are proteratogens requiring bioactivation.
Purpose:
- To elucidate the biochemical and molecular mechanisms of teratological susceptibility.
- To explain how xenobiotic bioactivation leads to reactive metabolites.
- To outline the factors determining embryonic susceptibility to teratogens.
Summary:
- Embryotoxic xenobiotics are bioactivated by enzymes into reactive metabolites (free radicals or electrophiles).
- These metabolites damage cellular macromolecules like DNA, proteins, and lipids, disrupting cellular function.
- Embryonic susceptibility arises from immature detoxification, cytoprotection, and repair pathways, making embryos vulnerable to reactive intermediates.
Impact:
- Teratogenesis can occur even at therapeutic drug concentrations or low environmental chemical levels.
- Understanding these mechanisms is crucial for preventing birth defects.
- Highlights the vulnerability of the developing embryo to xenobiotic insult.