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Am. J. Respir. Crit. Care Med., Vol 149, No. 2, 02 1994, 400-407.

Airways hyperreactivity and cellular accumulation in a delayed-type hypersensitivity reaction in the mouse. Modulation by capsaicin- sensitive nerves

TL Buckley and FP Nijkamp
Department of Pharmacology, Faculty of Pharmacy, Utrecht University, The Netherlands.

The aim of this study was to investigate the possible role of capsaicin- sensitive nerves in a pulmonary delayed-type hypersensitivity (DTH) reaction. Mice (Balb/c) were skin-sensitized with dinitrofluorobenzene (DNFB; 0.5%, 100 microliters) on two consecutive days and challenged intranasally 5 days later with dinitrobenzene sulphonic acid (0.6%, 50 microliters). Sensitized mice exhibited tracheal hyperreactivity to carbachol 24 and 48 h after challenge; however, no hyperreactivity was observed 2 h after challenge. At 24 h, but not at 48 h, hyperreactivity was associated with antigen-specific lymphocyte accumulation in bronchoalveolar lavage fluid (BALF). Capsaicin pretreatment, resulting in the depletion of sensory neuropeptides, virtually abolished hyperreactivity to carbachol 24 and 48 h after challenge in sensitized mice. Although at 24 h after challenge the lymphocyte population was elevated in the BALF collected from capsaicin-pretreated mice, this accumulation was not antigen-specific. Additionally, there was an increase in polymorphonuclear leukocyte accumulation (neutrophils and eosinophils) in the BALF collected from capsaicin-pretreated mice at this time point, but this increase was more profound in the sensitized group. In summary, tracheal hyperreactivity and cellular accumulation are prominent features of the lymphocyte-associated DTH reaction induced by DNFB in the mouse lung. Evidence presented in this report highlights the possible importance of sensory neuropeptides in pulmonary inflammation and airways hyperreactivity.


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