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. 1993 Dec;110(4):1311–1316. doi: 10.1111/j.1476-5381.1993.tb13961.x

Effects of two beta 3-adrenoceptor agonists, SR 58611A and BRL 37344, and of salbutamol on cholinergic and NANC neural contraction in guinea-pig main bronchi in vitro.

C A Martin 1, E Naline 1, L Manara 1, C Advenier 1
PMCID: PMC2175861  PMID: 7905768

Abstract

1. The aim of the present study was to investigate the type of adrenoceptor which modulates constriction of the guinea-pig isolated main bronchus in response to electrical field stimulation (EFS). Drugs used were salbutamol and two agonists reportedly selective for the putative beta 3-adrenoceptor: BRL 37344 and SR 58611A. 2. At basal tone, all three drugs induced relaxation, however, SR 58611A and BRL 37344 (10(-9) to 10(-6) M) relaxed guinea-pig isolated main bronchus more weakly than salbutamol (10(-9) to 10(-6) M). The effects observed at 10(-6) M were 43% +/- 9%, 63% +/- 4% and 98% +/- 1% of the maximal effect induced by theophylline (3 x 10(-3) M) for SR 58611A, BRL 37344 and salbutamol, respectively. 3. SR 58611A and BRL 37344 (10(-8) to 10(-6) M) did not significantly modify the cholinergic component of the response to EFS, but caused a concentration-dependent reduction of the nonadrenergic non-cholinergic (NANC) excitatory component (41.8% +/- 10.1% and 56.8% +/- 7.4% respectively at 10(-6) M, n = 6-7). Salbutamol (10(-9) to 10(-7) M) strongly inhibited both components, with 91.1% +/- 4.2% of inhibition for the NANC contraction and 62.0% +/- 5.2% of inhibition for the cholinergic contraction (10(-7) M, n = 7). 4. Whereas the inhibitory effects of salbutamol were strongly inhibited by both propranolol (10(-6) M) and ICI 118,551 (10(-6) M), those of BRL 37344 were only slightly, albeit significantly reduced by both propranolol and ICI 118,551, and those of SR 58611A were unaffected by treatment with either beta-adrenoceptor antagonist.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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