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Calcium transport through the placenta.

M G Brunette1

  • 1Faculté de médécine, Université de Montréal, Québec, Canada.

Canadian Journal of Physiology and Pharmacology
|October 1, 1988
PubMed
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Fetal calcium levels rise exponentially, transferred actively from mother to fetus. This placental calcium transport involves vitamin D and ATP-dependent mechanisms, though precise cellular pathways remain unclear.

Area of Science:

  • Reproductive Biology
  • Maternal-Fetal Medicine
  • Biochemistry

Background:

  • Fetal calcium content increases exponentially during gestation.
  • Maternal-to-fetal calcium transfer is an active process, evidenced by higher fetal blood calcium concentrations.
  • Fetal parathyroid hormone and 1,25-(OH)2 vitamin D3 regulate fetal calcium levels.

Purpose of the Study:

  • To investigate the mechanisms of calcium transport across the placenta.
  • To explore the role of vitamin D metabolites in placental calcium transfer.
  • To elucidate the cellular mechanisms involved in ATP-dependent calcium uptake in the human placenta.

Main Methods:

  • In situ perfusion of the umbilical artery to assess net calcium transfer.
  • Detection of vitamin D-dependent calcium-binding protein in placental tissue.

Related Experiment Videos

  • Analysis of ATP-dependent calcium uptake using microsomal membrane vesicles from human placenta.

    • Main Results:

    • Placental perfusion studies indicate active calcium transport against a concentration gradient.
    • A vitamin D-dependent calcium-binding protein is present in the placenta.
    • Human placental microsomes exhibit saturable, magnesium-dependent, ATP-dependent calcium uptake with Michaelis-Menten kinetics (Km ≈ 70 nM ionized calcium).
    • Two Ca2+ ATPases with differing calcium affinities have been identified.

    Conclusions:

    • Active maternal-fetal calcium transfer is crucial for fetal development.
    • Vitamin D metabolites likely play a significant role in regulating placental calcium transport.
    • While ATP-dependent calcium uptake mechanisms exist, their precise localization and role in syncytial cells require further investigation.