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Chronic platelet-activating factor induces a decrease in pulmonary vascular compliance, hydroxyproline, and loss of

J A Ohar1, K S Waller, J Pantano

  • 1Department of Internal Medicine, St. Louis University Medical Center, MO 63110-0250.

American Journal of Respiratory and Critical Care Medicine
|June 1, 1994
PubMed
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Chronic platelet-activating factor (PAF) infusion in rabbits causes pulmonary artery contracture and reduced vascular compliance, linked to cell loss and collagen reduction. These structural changes impact the elastic modulus more than pulmonary vascular resistance.

Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Hypertension Research
  • Vascular Remodeling

Background:

  • Chronic intravenous platelet-activating factor (PAF) administration induces pulmonary artery remodeling, including contracture and elastic lamina changes.
  • The precise mechanism behind PAF-induced pulmonary arterial contracture remains unclear.

Purpose of the Study:

  • To investigate if PAF-induced arterial contracture is mediated by cell loss.
  • To determine the association between morphologic alterations and changes in pulmonary vascular compliance and resistance.

Main Methods:

  • Quantified cell nuclei and hydroxyproline content in pulmonary arteries of PAF-treated rabbits to assess cell loss and collagen content.
  • Measured pulmonary vascular compliance and resistance in isolated, perfused lungs from chronically PAF-treated rabbits using four different methods.

Related Experiment Videos

Main Results:

  • PAF treatment increased the nuclear ratio in intra- and preacinar pulmonary arteries, suggesting cell loss.
  • Reduced hydroxyproline content in intra-acinar lung tissue indicated a loss of interstitial collagen.
  • Pulmonary vascular compliance was significantly decreased in PAF-treated lungs across all measurement techniques, while pulmonary vascular resistance remained unchanged.

Conclusions:

  • Chronic PAF infusion leads to pulmonary arterial contracture associated with cell and collagen loss.
  • Structural remodeling significantly reduces pulmonary vascular compliance.
  • These structural changes primarily affect the elastic modulus rather than pulmonary vascular resistance.