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Pulmonary inflammation and airway hyperresponsiveness in a mouse model of asthma complicated by acid aspiration

机译:哮喘小鼠酸吸入引起的肺部炎症和气道高反应性

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Several studies have indicated a strong association between asthma and aspiration of stomach contents. However, the complex association between these inflammatory processes has not been studied extensively in animal models. In the present study, we developed an animal model to evaluate the inflammatory cell, chemokine, and airway responses to asthma complicated by aspiration. The model was produced by sensitizing mice to cockroach allergens from house-dust extracts. Mice with asthma-like airway responses then were inoculated intratracheally with either an acidic solution or saline. Acid aspiration increased airway hyperresponsiveness in mice with asthma for at least 8 h. After 6 h, the combined injury caused an additive, not synergistic, increase in airway hyperresponsiveness and neutrophil recruitment to the airways. Although cysteinyl leukotrienes in bronchoalveolar lavage fluid were higher after acid aspiration, treatment with a receptor antagonist before aspiration did not diminish airway hyperresponsiveness. Vagal mechanisms reportedly mediate airway responses in acid aspiration; however, pretreatment with an anticholinergic agent did not reduce airway responses to acid. These results are consistent with an effective model of the acute effects of aspiration on the allergic lung. Further studies could examine how various forms of aspiration influence the severity of asthma.
机译:几项研究表明哮喘与胃内容物吸入之间有很强的联系。但是,尚未在动物模型中广泛研究这些炎症过程之间的复杂关联。在本研究中,我们开发了一种动物模型来评估炎症性细胞,趋化因子和气道对哮喘并发吸入的反应。该模型是通过使小鼠对来自屋尘提取物的蟑螂过敏原敏感而产生的。然后将气喘样小鼠用酸性溶液或生理盐水气管内接种。酸吸入增加哮喘小鼠的气道高反应性至少8 h。 6小时后,合并的损伤导致气道高反应性和嗜中性白细胞向气道募集的加性而非协同作用。尽管在酸抽吸后支气管肺泡灌洗液中的半胱氨酰白三烯含量较高,但在抽吸前用受体拮抗剂治疗并不能减轻气道高反应性。据报道迷走神经机制介导了酸吸入中的气道反应。但是,用抗胆碱能药物进行预处理并不能降低呼吸道对酸的反应。这些结果与吸入对过敏性肺的急性影响的有效模型一致。进一步的研究可以检查各种形式的抽吸如何影响哮喘的严重程度。

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