Abstract

Kinins have been implicated in the pathophysiology of asthma and activation of kinin receptors stimulates neutrophil chemotaxis. However, the expression of kinin receptors on neutrophils of asthmatic subjects has not been assessed. The aim of this study was to compare the expression of kinin B1 and B2 receptor mRNA and proteins in neutrophils of asthmatic and non-asthmatic subjects, and to assess whether inhaled corticosteroid treatment may influence expression of the kinin receptors. Neutrophils were isolated from peripheral blood of asthmatic (n = 27) and non-asthmatic subjects (n = 14). The presence of kinin B1 and B2 receptor protein on neutrophils was confirmed by immunolabeling with specific antibodies followed by immunoperoxidase, immunofluorescence and FACS detection. Kinin B1 and B2 receptor mRNA expression was assessed by RT-PCR. Quantitative image analysis of fluorescence immunolabeled neutrophils showed no differences in kinin B1 or B2 receptor protein expression between asthmatic and non-asthmatic subjects. Similarly, quantitative real time RT-PCR analysis demonstrated no differences in expression of mRNA for the kinin B1 or B2 receptors between asthmatic and non-asthmatic subjects. However, B1 receptor mRNA expression was significantly lower in asthmatic subjects using ≥ 2000 μg of inhaled corticosteroid per day (p < 0.05) and B1 receptor protein levels also tended to be lower in these subjects. Corticosteroids may have a beneficial anti-inflammatory effect in asthma by down-regulating B1 receptor expression on neutrophils, thereby decreasing the migration of these inflammatory cells into the airways. © 2007 Elsevier B.V. All rights reserved.