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Bronchial epithelial cells produce IL-5: implications for local immune responses in the airways.

机译:支气管上皮细胞产生IL-5:对气道中局部免疫反应的影响。

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摘要

IL-5 is a pleiotropic cytokine that promotes eosinophil differentiation and survival. While naive bronchial epithelial cells (BEC) produce low levels of IL-5, the role of BEC-derived IL-5 in allergic airway inflammation is unknown. We now show that BEC, isolated from mice with OVA-induced allergic airway disease (AAD), produced elevated levels of IL-5 mRNA and protein as compared to BEC from naive mice. To determine the contribution of BEC-derived IL-5 to effector responses in the airways, IL-5 deficient bone marrow chimeric mice were generated in which IL-5 expression was restricted to stromal (e.g. BEC) or hematopoietic cells. When subjected to AAD, IL-5 produced by BECs contributed to mucous metaplasia, airway eosinophilia, and OVA-specific IgA levels. Thus, IL-5 production by BEC can impact the microenvironment of the lung, modifying pathologic and protective immune responses in the airways.
机译:IL-5是促进嗜酸性粒细胞分化和存活的多效细胞因子。虽然幼稚的支气管上皮细胞(BEC)产生低水平的IL-5,但未知BEC衍生的IL-5在过敏性气道炎症中的作用。我们现在显示,与来自幼稚小鼠的BEC相比,从具有OVA诱发的过敏性气道疾病(AAD)的小鼠中分离出的BEC产生升高的IL-5 mRNA和蛋白质水平。为了确定BEC来源的IL-5对气道中效应反应的贡献,产生了IL-5缺陷的骨髓嵌合小鼠,其中IL-5的表达局限于基质细胞(例如BEC)或造血细胞。接受AAD时,BEC产生的IL-5有助于粘膜化生,气道嗜酸性粒细胞增多和OVA特异性IgA水平。因此,BEC产生的IL-5可以影响肺的微环境,从而改变气道的病理性和保护性免疫反应。

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