Allergic sensitization enhances the contribution of Rho-kinase to airway smooth muscle contraction

British Journal of Pharmacology
Dedmer SchaafsmaS Adriaan Nelemans

Abstract

1. Repeated allergen challenge has been shown to increase the role of Rho-kinase in airway smooth muscle (ASM) contraction. We considered the possibility that active allergic sensitization by itself, that is, without subsequent allergen exposure, could be sufficient to enhance Rho-kinase-mediated ASM contraction. 2. Guinea pigs were actively IgE-sensitized to ovalbumin (OA), using Al(OH)(3) as adjuvant. Contractile responsiveness to G(q)-coupled receptor agonists (methacholine, histamine or PGF(2alpha)) was investigated in tracheal rings. No effect of sensitization was observed on basal- and methacholine-induced myogenic tone. In contrast, potency of histamine and PGF(2alpha) increased, that is, EC(50) decreased, after OA-sensitization by 2.6- and 4.7-fold, respectively, without effect on maximal contraction (E(max)). 3. Basal tone in preparations from both control and OA-sensitized animals was strongly decreased in the presence of the Rho-kinase inhibitor (+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl) cyclohexane carboxamide (Y-27632) (1 microm). In control preparations, the E(max) and potency of histamine were unaffected by Y-27632, but were decreased for PGF(2alpha) (by 38.2% and 2.0-fold, respectively). However, in preparatio...Continue Reading

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Citations

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