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Hypervitaminosis A induced teratogenesis.

J A Geelen

    CRC Critical Reviews in Toxicology
    |November 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Excessive vitamin A (hypervitaminosis A) causes birth defects across multiple organ systems. This review details vitamin A-induced malformations, their developmental timing, and underlying mechanisms in embryotoxicity research.

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    Area of Science:

    • Developmental Toxicology
    • Reproductive Toxicology

    Background:

    • Reproductive toxicology, focusing on mutagenic and embryotoxic effects, is increasingly critical.
    • Embryotoxicity studies require understanding drug-embryo interactions, developmental processes, and susceptible prenatal stages.

    Purpose of the Study:

    • To review vitamin A-induced malformations across various organ systems.
    • To discuss the morphogenesis and susceptible developmental stages of these defects.
    • To explore the mechanisms of teratogenesis using hypervitaminosis A as a model.

    Main Methods:

    • Comprehensive review of existing literature on hypervitaminosis A and teratogenicity.
    • Analysis of malformations in nervous, ocular, craniofacial, cardiovascular, respiratory, digestive, urogenital, and skeletal systems.

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  • Examination of embryotoxic effects across different species and influencing factors.

    • Main Results:

    • Hypervitaminosis A induces defects in nearly all organ systems.
    • Detailed descriptions of malformations, their morphogenesis, and critical developmental windows are provided.
    • Experimental data on teratogenic effects, minimum effective dose, and interactions are discussed.

    Conclusions:

    • Hypervitaminosis A serves as a key model for understanding congenital defect induction.
    • Further research into the pathophysiology of vitamin A embryotoxicity is valuable.
    • Understanding these mechanisms is crucial for assessing risks in human pregnancy.