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Placental glycogen

S A Robb, F E Hytten

    British Journal of Obstetrics and Gynaecology
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Placental glycogen levels are high in early pregnancy but stabilize later. These levels remain consistent across various maternal and fetal conditions, suggesting a localized role rather than a general fetal energy reserve.

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    Area of Science:

    • Biochemistry
    • Human Physiology
    • Perinatal Medicine

    Background:

    • Glycogen serves as an energy reserve in various tissues.
    • The role and regulation of glycogen within the placenta are not fully understood.
    • Investigating placental glycogen is crucial for understanding fetal development and maternal-fetal health.

    Purpose of the Study:

    • To quantify and map the distribution of glycogen in human placentae across different gestational ages.
    • To investigate the correlation between placental glycogen levels and various physiological and pathological conditions.
    • To determine the potential role of placental glycogen as an energy source for the fetus.

    Main Methods:

    • Analysis of glycogen concentration in 86 term placentae and 8 early-gestation placentae (8-16 weeks).

    Related Experiment Videos

  • Histochemical localization of glycogen within placental tissue.
  • Correlation analysis with maternal and fetal plasma glucose and insulin levels, as well as clinical conditions.

    • Main Results:

    • Placental glycogen concentration is high in the first trimester (4.5-6.5 mg/g) and decreases to a stable range (approx. 1.5 mg/g) from 12 weeks to term.
    • Glycogen levels were unaffected by maternal conditions like diabetes, pre-eclampsia, intrauterine growth retardation, or fetal distress.
    • Glycogen was primarily localized near major fetal blood vessels, suggesting a role in placental vascular function.

    Conclusions:

    • Placental glycogen concentration significantly decreases after the first trimester and remains stable until term.
    • Placental glycogen levels are remarkably consistent across a spectrum of clinical conditions and do not appear to be influenced by maternal or fetal metabolic status.
    • The localized distribution of glycogen near fetal blood vessels indicates a specialized, local function, likely related to placental vascular activity, rather than a general energy reserve for the fetus.