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. 1993 Sep;110(1):127–132. doi: 10.1111/j.1476-5381.1993.tb13781.x

Leukotriene D4- and prostaglandin F2 alpha-induced airflow obstruction and airway plasma exudation in guinea-pig: role of thromboxane and its receptor.

H Arakawa 1, J Lötvall 1, I Kawikova 1, C G Löfdahl 1, B E Skoogh 1
PMCID: PMC2176029  PMID: 8220872

Abstract

1. We studied the effects of a thromboxane A2 receptor (TP receptor) antagonist, ICI-192,605 (0.5 mg kg-1, i.v.) and a selective thromboxane (Tx) synthetase inhibitor, OKY-046 (30 mg kg-1, i.v.), on airway responses induced by leukotriene D4 (LTD4; 0.2 nmol) or prostaglandin F2 alpha (PGF2 alpha; 20 nmol) instilled via the airways route to anaesthetized guinea-pigs. For a comparison, airway responses to a TxA2-mimetic, U-46619 (0.02 nmol) were also studied. We measured both lung resistance (RL) to monitor airflow obstruction, and extravasation of Evans Blue dye to quantify airway plasma exudation. 2. Instilled LTD4 into the tracheal lumen induced an immediate peak and subsequently persistent increase in RL and produced a large amount of extravasation of Evans Blue dye at all airway levels. Both ICI-192,605 and OKY-046 significantly attenuated the persistent increase in RL following the immediate response and reduced LTD4-induced extravasation of Evans Blue dye in the trachea and proximal intrapulmonary airway. Instilled LTD4 produced significant increases in immunoreactive TxB2 in bronchoalveolar lavage fluid obtained 1.5 min after instillation of LTD4. 3. Instilled PGF2 alpha into the tracheal lumen induced an immediate increase in RL which peaked at approximately 15 s. We also observed a delayed sustained increase in RL, reaching a second peak at approximately 4 min. PGF2 alpha produced small but significant increases in the amount of Evans Blue dye at all airway levels. As with PGF2 alpha, instillation of U-46619 produced a biphasic increase in RL and extravasation of Evans Blue dye.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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