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. 1992 Mar;105(3):609–612. doi: 10.1111/j.1476-5381.1992.tb09027.x

The role of cyclic AMP in non-adrenergic non-cholinergic contraction in guinea-pig bronchi.

T Aikawa 1, K Sekizawa 1, M Morikawa 1, S Itabashi 1, H Sasaki 1, T Takishima 1
PMCID: PMC1908464  PMID: 1378340

Abstract

1. We investigated the role of adenosine 3':5'-cyclic monophosphate (cyclic AMP) in non-adrenergic non-cholinergic (NANC) contraction in guinea-pig bronchial strips. 2. Forskolin (3 nM to 1 microM) reduced NANC contraction induced by electrical field stimulation (EFS) in a concentration-dependent fashion (-log EC50 was 7.22 +/- 0.12 M and maximum inhibition was 100 +/- 0.01%). However, forskolin (less than 1 microM) did not alter the contraction induced by substance P (SP, 1 microM). 3. Dibutyryl cyclic AMP (1 mM) also reduced NANC contractions induced by EFS (100 +/- 0.01%) without significant effect on SP (1 microM)-induced contractions. In contrast, dibutyryl cyclic GMP (1 mM) was without effect against either NANC or SP-induced contractions. 4. Both the beta 2-adrenoceptor agonist, procaterol (0.1 nM to 3 nM) and theophylline (100 nM to 1 mM) concentration-dependently reduced EFS-induced NANC contractions without significant effect on SP (1 microM)-induced contractions. 5. In contrast to forskolin, procaterol and theophylline, both sodium nitroprusside and cromakalim inhibited the EFS-induced contractions only at those concentrations that similarly reduced the contractions induced by SP (1 microM). 6. These results suggest that cyclic AMP may mediate pre-junctional inhibition of NANC contractions in guinea-pig bronchi.

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Selected References

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