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Related Experiment Videos

Fetal macrosomia--animal models.

R Schwartz, J Susa

    Diabetes Care
    |May 1, 1980
    PubMed
    Summary

    Infant macrosomia, or excessive birth weight, is linked to maternal diabetes. In utero, hyperinsulinemia accelerates fetal growth, leading to macrosomia and organ enlargement, even without maternal hyperglycemia.

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    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Developmental biology

    Background:

    • Maternal diabetes mellitus is a known cause of infant macrosomia.
    • Existing animal models for studying diabetic effects on fetal development have limitations.
    • Previous research suggests potential transgenerational effects of chemically induced diabetes.

    Purpose of the Study:

    • To investigate the direct effects of hyperinsulinemia on fetal development.
    • To establish an animal model that replicates human infant macrosomia seen in diabetic pregnancies.
    • To elucidate the mechanisms by which in utero insulin influences fetal growth and organ development.

    Main Methods:

    • Utilized a non-diabetic pregnant rhesus monkey model.
    • Administered insulin to induce hyperinsulinemia in fetal rhesus monkeys.
    • Analyzed fetal growth, organ size, and hepatic enzyme activities.

    Main Results:

    • Macrosomia and selective organomegaly were observed in fetuses with induced hyperinsulinemia.
    • Hepatic enzyme activities related to lipogenesis increased, while those for gluconeogenesis decreased.
    • These findings mimicked changes seen in human infants of diabetic mothers.

    Conclusions:

    • Hyperinsulinemia in utero can directly cause macrosomia and organomegaly.
    • Insulin's primary role in utero appears to be growth acceleration.
    • This model provides insights into the developmental impact of maternal diabetes, independent of maternal hyperglycemia.

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