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Folate antagonism following teratogenic exposure to diphenylhydantoin
Abstract:
Previous studies have reported indirect evidence for the mediation of folate antagonism in the induction of malformations by diphenylhydantion. We have demonstrated that a teratogenic regimen of folate-deficiency and antagonism using 9-methyl PGA in the rat produces significantly decreased rates of oxygen consumption in the maldeveloping embryos. The present study reports similar reductions in oxygen uptake by mouse embryos from mothers treated with teratogenic doses of diphenylhydantoin, and documents a significant depression of the actual folate levels in such embryos. The differences are less significant with lower doses of diphenylhydantoin, and do not occur with a nonteratogenic dose.
Insights
Diphenylhydantoin (DPH) exposure during pregnancy reduces embryo oxygen consumption and folate levels, suggesting folate antagonism contributes to DPH-induced birth defects. This mechanism was observed in mouse embryos.
Area of Science:
- Developmental toxicology
- Teratology
- Biochemistry
Background:
- Diphenylhydantoin (DPH) is a known teratogen associated with birth defects.
- Previous research suggested folate antagonism might mediate DPH's teratogenic effects.
- Folate is crucial for embryonic development and cellular metabolism.
Purpose of the Study:
- To investigate the direct impact of teratogenic doses of DPH on mouse embryo oxygen consumption.
- To determine if DPH treatment significantly alters folate levels within developing mouse embryos.
- To correlate these biochemical changes with DPH's teratogenic potential.
Main Methods:
- Pregnant mice were administered teratogenic doses of diphenylhydantoin.
- Oxygen consumption rates of developing embryos were measured.
- Embryo folate levels were quantified biochemically.
Main Results:
- Mouse embryos exposed to teratogenic DPH doses exhibited significantly reduced oxygen uptake.
- A significant depression in actual folate levels was documented in DPH-treated embryos.
- These effects were dose-dependent, with lower or non-teratogenic doses showing diminished or no impact.
Conclusions:
- Diphenylhydantoin exposure directly impairs embryonic oxygen consumption.
- DPH treatment leads to a significant reduction in embryonic folate levels, supporting folate antagonism.
- These findings provide direct evidence for folate antagonism as a key mechanism in DPH-induced teratogenesis.