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Fetal pulmonary vasodilation after exogenous platelet-activating factor.

F J Accurso1, S H Abman, R B Wilkening

  • 1Department of Pediatrics, University of Colorado School of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1991
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Summary

Platelet-activating factor (PAF) acts as a potent fetal pulmonary vasodilator, increasing blood flow without altering pressure. This effect is specific to PAF and blocked by PAF receptor antagonists.

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Area of Science:

  • Cardiovascular Physiology
  • Fetal Medicine
  • Pharmacology

Background:

  • Platelet-activating factor (PAF) is a lipid mediator with diverse physiological roles.
  • Its specific effects on the fetal pulmonary vasculature are not fully elucidated.
  • Understanding these effects is crucial for managing fetal circulatory conditions.

Purpose of the Study:

  • To investigate the hemodynamic response of the fetal pulmonary vasculature to platelet-activating factor (PAF).
  • To determine the specific mechanisms underlying PAF's effects in the fetal lamb model.

Main Methods:

  • Chronically catheterized fetal lambs were used to study hemodynamic responses.
  • Platelet-activating factor (PAF) was infused directly into the left pulmonary artery.
  • Pulmonary blood flow and pressure were measured using electromagnetic flow transducers.
  • PAF receptor antagonists and other blockers were used to investigate mechanisms.

Main Results:

  • Low-dose PAF infusions significantly increased fetal pulmonary blood flow (Q) without altering pulmonary arterial pressure.
  • PAF-induced vasodilation was confirmed by pressure-flow relationship assessments.
  • Lyso-PAF had no effect, and the response to PAF was blocked by the PAF receptor antagonist CV-3988.
  • Systemic PAF infusion increased both pulmonary and aortic pressures and blood flow, without affecting ductal tone.

Conclusions:

  • Platelet-activating factor (PAF) is a potent vasodilator in the fetal pulmonary circulation.
  • The vasodilatory effects of PAF are mediated via specific PAF receptors.
  • These effects are independent of cyclooxygenase products, cholinergic, or histaminergic pathways.