IN VITRO
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Interactions between beta2-adrenoreceptor agonist and NO donors in the relaxation of guinea pig trachea in vitro.

The effects of interaction between the beta2-adrenoreceptor agonist, salbutamol, and the nitric oxide donors, sodium nitroprusside and 3-morpholinosydnonimine (SIN-1), on guinea pig trachea contraction were studied. Cumulatively increased concentrations (0.1-10 nM) of salbutamol together with a single concentration of SNP (0.33 microM) or with SIN-1 (1 microM) showed significant (p < 0.001) synergy for the inhibition of 1 microM metacholine-induced contraction. Significant synergy (p < 0.05) was also found for the inhibition of this contraction by cumulatively increased concentrations (0.1-33 microM) of SNP and a single concentration (1 nM) of salbutamol. No synergistic effect was found on the 40 mM KC1-induced contraction. We suggest that the combination of NO donors with salbutamol has a synergistic effect on metacholine contraction.

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