Influence of Thromboxane A2 Receptor Antagonism on Pulmonary Vasoconstrictor Responses View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1989-09

AUTHORS

Linda M Bradley, Joseph J Stambouly, John F Czaja, Robert E Goldstein

ABSTRACT

Thromboxane A2 (TxA2) is an arachidonic acid metabolite which causes severe pulmonary vasoconstriction (PV) and may mediate the PV produced by platelet-activating factor (PAF-acether) and leukotriene D4 (LTD4). To determine the role of TxA2 receptors on PAF-acether, LTD4, and hypoxia-induced PV, we administered PAF-acether 0.1 nmol/kg, the TxA2 analog U-46619 0.2 micrograms/kg/min, LTD4 3.0 micrograms/kg, or acute hypoxia (FiO2 = 0.12 for 3 min) before and during the infusion of the selective TxA2 receptor blocker SQ 29,548 50 micrograms/kg/min or vehicle into 27 open-chest, anesthetized newborn piglets, measuring pulmonary and systemic arterial pressures, cardiac index, and right and left ventricular pressures and dimensions. Mean pulmonary arterial pressure rose and cardiac index fell in response to PAF-acether (14 +/- 1 to 32 +/- 2 mm Hg and 91 +/- 5 to 15 +/- 5 mL/kg/min, both p less than 0.01), U-46619 (11 +/- 1 to 28 +/- 2 mm Hg and 93 +/- 10 to 36 +/- 9 mL/kg/min, both p less than 0.01), and LTD4 (13 +/- 3 to 22 +/- 2 mm Hg and 85 +/- 12 to 29 +/- 9 mL/kg/min, both p less than 0.05). Acute hypoxia increased PAP (12 +/- 1 to 26 +/- 2 mm Hg, p less than 0.01) but did not alter cardiac index. Infusion of SQ 29,548 prevented PAF-acether and U-46619-induced increases in pulmonary arterial pressure (13 +/- 1 to 14 +/- 1 mm Hg and 12 +/- 1 to 12 +/- 1 mm Hg) and decreases in cardiac index (70 +/- 4 to 70 +/- 3 mL/kg/min and 94 +/- 14 to 92 +/- 12 mL/kg/min) but failed to alter the response to LTD4 or hypoxia. Vehicle had no effect. We conclude that TxA2 receptors are not involved in LTD4 or hypoxia-induced PV but play an important role in the PV produced by PAF-acether and U-46619. More... »

PAGES

175

Identifiers

URI

http://scigraph.springernature.com/pub.10.1203/00006450-198909000-00002

DOI

http://dx.doi.org/10.1203/00006450-198909000-00002

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051567613

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/2587116


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