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Endogenous vasodilators modulate pulmonary vascular anaphylaxis

L J Kelly1, B J Undem, G K Adams

  • 1Johns Hopkins University School of Medicine, Baltimore, Maryland 21224.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1994
PubMed
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Endothelium-derived nitric oxide and a guanosine 3

Area of Science:

  • Pulmonary vascular pharmacology
  • Respiratory system physiology
  • Immunopharmacology

Background:

  • Pulmonary arteries exhibit complex responses to antigen challenges.
  • Endogenous vasodilators play a crucial role in modulating vascular tone.

Purpose of the Study:

  • To investigate the role of endothelium-derived nitric oxide (EDNO) in antigen-induced contractions of guinea pig pulmonary arteries.
  • To elucidate the mechanisms underlying the modulation of anaphylactic responses in pulmonary vasculature.

Main Methods:

  • Isolation and in vitro study of guinea pig pulmonary arteries.
  • Induction of antigen-specific contraction using ovalbumin.
  • Pharmacological interventions including methylene blue, saponin, and nitro-L-arginine methyl ester.

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Main Results:

  • Antigen-induced contraction was transient, with tension returning to baseline within 15 minutes.
  • Methylene blue prolonged and increased contraction amplitude, suggesting inhibition of nitric oxide.
  • Endothelium removal enhanced contraction magnitude but not duration.
  • Nitro-L-arginine methyl ester increased contraction magnitude, confirming EDNO's inhibitory role.

Conclusions:

  • Endothelium-derived nitric oxide inhibits the early phase of antigen-induced pulmonary artery contraction.
  • An endothelium-independent, cGMP-dependent relaxing factor attenuates the duration of anaphylactic contraction.
  • These findings highlight dual endogenous vasodilator mechanisms in regulating pulmonary vascular response to anaphylaxis.