Protector mechanisms of the association between gastroesophageal reflux disease and asthma: experimental study in rats

Arquivos de Gastroenterologia

Paula Yuri Sugishita Kanikadan²  Jayme Antonio Aboin Sertié¹  Ricardo Martins Oliveira-filho¹  Wothan Tavares De Lima¹ 

[1] ,University of São Paulo Faculty of Public Health Department of Public Health Practice

关键词: Gastroesophageal reflux;    Asthma;    Bronchial hyperreactivity;    Methacholine chloride;    Rats;    Refluxo gastroesofágico;    Asma;    Hiper-reatividade brônquica;    Cloreto de metacolina;    Ratos;   

DOI  :  10.1590/S0004-28032008000300015

来源: SciELO

【 摘 要 】

BACKGROUND: It is well known the association between gastroesophageal reflux disease and asthma. The hyperreactivity of the airways is a characteristic of an asthmatic. Many studies associate the increase of the airways reactivity with gastroesophageal reflux disease. AIM: In this study we have evaluated the effect of the intraluminal exposition to gastric juice of trachea on the reactivity to methacholine from rats submitted to a pulmonary allergic inflammation. METHODS: Group of rats were sensitized and challenged with ovalbumin. After 24 hours the animals were sacrificed, and their tracheae were removed to be cultured with gastric juice. The gastric juice was obtained from a donor rat. Subsequently the segments were placed into plastic plates with RPMI-1640 for incubation, under suitable atmosphere and time. After the period of incubation the segments were put into chambers for the analysis of the contractile response to methacholine. RESULTS: We observed reduction in the contractile response of trachea cultured with gastric juice from allergic rats. This result was confirmed by the pharmacological treatments with compound 48/80 and dissodium cromoglicate (mast cells blockade), L-NAME (nitric oxide inhibitor, NO), capsaicin (neuropeptides depletion) and indomethacin (ciclooxigenase inhibitor). CONCLUSIONS: Our results highlight to the existence of a complex interaction between pulmonary allergy and gastric juice in the airways. The involvement of the non-adrenergic non-cholinergic system, NO, prostanoids and mast cells are directly related to this interaction. We suggest that the reduced contractile response observed in vitro may represent a protector mechanism of the airways. Despite its presence in the human body it can not be observed due to the predominant effects of excitatory the non-adrenergic non-cholinergic system.

【 授权许可】

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