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Related Experiment Videos

Heme oxygenase activity in term human placenta.

B E McLaughlin1, J M Hutchinson, C H Graham

  • 1Department of Pharmacology and Toxicology, Queen's University, Kingston, Ontario, Canada.

Placenta
|November 30, 2000
PubMed
Summary

Carbon monoxide (CO), a heme oxygenase (HO) product, regulates placental perfusion. This study found significant HO enzymatic activity in human placenta, supporting its role in placental hemodynamics.

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Area of Science:

  • Biochemistry
  • Physiology
  • Reproductive Biology

Background:

  • Carbon monoxide (CO) acts as a gaseous signaling molecule.
  • Heme oxygenase (HO) produces CO from heme.
  • HO protein is expressed in the human placenta, suggesting a role in placental perfusion.

Purpose of the Study:

  • To quantify heme oxygenase (HO) enzymatic activity in various regions of the term human placenta.
  • To investigate the role of the heme-CO (HO) pathway in regulating placental hemodynamics.

Main Methods:

  • Enzymatic HO activity was measured in vitro in five distinct human placental regions.
  • A gas-chromatographic method quantified CO formation from heme in the microsomal fraction.
  • Activity was expressed as nanomoles of CO formed per gram of tissue per hour.

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Main Results:

  • HO enzymatic activity varied significantly across placental regions.
  • Higher HO activity was observed in the chorionic plate, chorionic villi, basal plate, and chorio-decidua compared to the amnion.
  • These findings indicate regional differences in HO activity within the term placenta.

Conclusions:

  • The presence of HO enzymatic activity in the human placenta supports its physiological relevance.
  • The heme-CO (HO) pathway likely complements the nitric oxide synthase pathway in regulating placental blood flow.
  • CO signaling is implicated in maintaining placental hemodynamic balance.