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Stage-dependent skeletal malformations induced by valproic acid in rat
E Menegola1, M L Broccia, M Prati
1Department of Biology, University of Milan, Italy.
The International Journal of Developmental Biology
|March 13, 1998
Summary
Sodium valproate (NaVP) exposure during rat embryonic development causes specific skeletal malformations. The timing of NaVP treatment dictates the location and type of axial skeleton abnormalities observed in fetuses.
Area of Science:
- Developmental toxicology
- Skeletal biology
- Teratology
Background:
- Sodium valproate (NaVP) is a known teratogen.
- Understanding the precise timing of teratogenic effects is crucial for risk assessment.
- The axial skeleton's development is a complex, stage-specific process.
Purpose of the Study:
- To investigate the skeletal teratogenic response of rats to NaVP.
- To determine the relationship between embryonic developmental stage and specific malformations.
- To identify critical periods for NaVP-induced axial skeleton abnormalities.
Main Methods:
- Crl:CD female rats were administered 400 mg/Kg b.w. NaVP subcutaneously.
- Treatment occurred at specific embryonic stages, defined by somite counts (presomitic to 22 somites).
- Skeletal examination of fetuses and placentas was performed; control group received saline.
Main Results:
- No significant effects on resorptions, live fetuses, or weights were observed.
- Skeletal malformations were strictly dependent on the timing of NaVP exposure.
- Specific vertebral and rib abnormalities were documented, varying with developmental stage.
Conclusions:
- NaVP exhibits stage-specific teratogenic effects on the rat axial skeleton.
- Early exposure (presomitic to 6 somites) affected cervical vertebrae and lumbar ribs.
- Later exposure affected thoracic and lumbo-sacral segments, suggesting gene expression interactions.