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Phase-specific developmental toxicity in mice following maternal methanol inhalation
B Bolon1, D C Dorman, D Janszen
1Chemical Industry Institute of Toxicology, Research Triangle Park, North Carolina 27709.
Summary
Maternal inhalation of high methanol concentrations is toxic to developing mouse embryos. The timing and duration of exposure significantly influenced the types of birth defects observed, including neural tube and limb anomalies.
Area of Science:
- Toxicology
- Developmental Biology
- Reproductive Toxicology
Background:
- Methanol is a known toxicant.
- Previous studies indicated methanol's toxicity to rodent embryos following maternal inhalation at high concentrations.
Purpose of the Study:
- To investigate methanol-induced developmental toxicity in CD-1 mice.
- To determine the effects of varying exposure concentrations and timing during gestation on embryonic development.
Main Methods:
- Pregnant mice were exposed to methanol via inhalation (6 hr/day) at 5000, 10,000, or 15,000 ppm during specific periods of organogenesis (GD 6-15, GD 7-9, or GD 9-11).
- Maternal health and fetal development, including resorptions, fetal weights, and malformations, were assessed.
Main Results:
- Maternal exposure to 10,000 and 15,000 ppm resulted in embryotoxicity, including increased resorptions, reduced fetal weights, and malformations.
- Specific terata observed included neural and ocular defects, cleft palate, hydronephrosis, and limb anomalies.
- Exposure timing influenced the type of malformation: neural tube and ocular defects (GD 7-9), limb anomalies (GD 9-11), and cleft palate/hydronephrosis (either period).
Conclusions:
- Maternal methanol inhalation induces developmental toxicity in a dose-dependent manner.
- The specific teratogenic effects are dependent on the stage of embryonic development and the duration of exposure.
- These findings highlight the critical windows of vulnerability during mouse embryonic development to methanol exposure.