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. 1991 Nov;104(3):596–602. doi: 10.1111/j.1476-5381.1991.tb12475.x

BAY u3405 an antagonist of thromboxane A2- and prostaglandin D2-induced bronchoconstriction in the guinea-pig.

H P Francis 1, S J Greenham 1, U P Patel 1, A M Thompson 1, P J Gardiner 1
PMCID: PMC1908239  PMID: 1797323

Abstract

1. The novel thromboxane (TX) antagonist, BAY u3405, has been evaluated against bronchoconstriction induced by the TXA2 mimetic U-46619, prostaglandin D2 (PGD2), 5-hydroxytryptamine (5-HT), leukotriene D4 (LTD4) and histamine in the guinea-pig in vivo by use of a modification of the model described by Konzett & Rössler. 2. When given intravenously (i.v.) at 30 or 100 micrograms kg-1, U-46619 caused 80% maximal bronchoconstriction in most animals. In contrast, PGD2 caused a smaller 40%-50% maximal bronchoconstriction at the highest dose tested (300 micrograms kg-1, i.v.). 3. BAY u3405, given intravenously, orally (p.o.) or by aerosol antagonized U-46619-induced bronchoconstriction in a dose-related manner. The approximate ID50 values were 600 micrograms kg-1, i.v., 1.7 mg kg-1 p.o. and 0.1% w/v 20 breaths by aerosol. 4. BAY u3405 had similar inhibitory activities against U-46619-induced bronchoconstriction and hypertension suggesting that it had no preferential activity on the airways. 5. When given intravenously BAY u3405 antagonized the bronchoconstrictor effect of intravenous PGD2 with ID50 values between 30-100 micrograms kg-1. 6. The action of BAY u3405 (10 mg kg-1, p.o.) was long lasting, causing significant inhibition of U-46619-induced bronchoconstriction 7 h after dosing. 7. At 1 mg kg-1, i.v., a dose that abolished the response to U-46619 and PGD2, BAY u3405 had no effect on histamine-, 5-HT- or LTD4-induced bronchoconstriction. 8. BAY u3405 potently and selectively antagonized U-46619- or PGD2-induced bronchoconstriction in the Konzett-Rössler model of guinea-pig lung function.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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