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Related Experiment Videos

Maternal factors modulating nutrient transfer to fetus.

M A Lasunción, J Lorenzo, M Palacin

    Biology of the Neonate
    |January 1, 1987
    PubMed
    Summary

    Maternal nutrient levels significantly impact fetal transfer, with glucose and alanine showing higher placental transfer rates in rats compared to larger species. Reduced uterine blood flow negatively affects amino acid transport to the fetus.

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    Area of Science:

    • Physiology
    • Perinatal Biology
    • Maternal-Fetal Medicine

    Background:

    • Maternal-fetal transfer of metabolites is crucial for fetal development.
    • Understanding nutrient transport across the placenta is key to managing pregnancy health.

    Purpose of the Study:

    • To review current knowledge on maternal-fetal metabolite transfer.
    • To present new data on placental transport of D-glucose, L-alanine, and glycerol in rats.

    Main Methods:

    • Infusion of 14C-labelled substrates (D-glucose, L-alanine, glycerol) into the uterine artery of pregnant rats.
    • Correction of fetal radioactivity by maternal plasma tracer dilution and uterine artery blood flow.
    • Estimation of placental transfer rates for each metabolite.

    Main Results:

    • Placental transfer rates in rats: D-glucose (127 μmol·kg⁻¹·min⁻¹), L-alanine (23 μmol·kg⁻¹·min⁻¹), glycerol (1 μmol·kg⁻¹·min⁻¹).
    • Maternal metabolite concentration directly correlates with placental transfer magnitude.
    • Placental transfer of glucose and alanine is reduced by maternal fasting or diabetes; L-alanine transfer and placental blood flow decrease in starved or diabetic rats.

    Conclusions:

    • Maternal nutrient concentration is a primary modulator of fetal metabolite transfer.
    • Reduced uterine blood flow adversely affects placental amino acid transport.
    • Glycerol transfer to the fetus is significantly lower than that of glucose or alanine.

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