Abrogation of lung inflammation in sensitized Stat6-deficient mice is dependent on the allergen inhalation procedure
作者:Alexandre Trifilieff、Ahmed El-Hasim、Randolph Corteling、Charles E Owen
DOI:10.1038/sj.bjp.0703501
日期:2000.8
Conflicting results have been reported about the role of Stat6 in allergen‐induced airway inflammation. We have studied the influence of the allergen inhalation procedure on the inflammatory response using wild‐type and Stat6‐deficient mice generated on a C57BL/6 background.
Animals were immunized i.p. on day 0 and 7 with ovalbumin (OVA) and then received aerosolized OVA or phosphate buffer saline challenge (acute on day 14; chronic on day 14, 15, 16, 17 and 18) before being sacrificed at different time points.
Following an acute challenge, Stat6‐deficiency fully abrogated the increase in serum IgE levels and the development of lung inflammation (inflammatory cell infiltration, IL‐4 and IL‐5 release, and increase in plasma leakage).
Following chronic challenge, despite the absence of IgE, IL‐4 and IL‐5, Stat6‐deficient mice develop a characteristic lung inflammation, although the intensity was smaller when compared with the wild‐type mice.
OVA‐induced early bronchoconstriction was observed in wild‐type mice only after chronic challenge, and this was totally abrogated in the Stat6‐deficient animals.
These results suggest that Stat6 signalling is essential for the development of allergic airway inflammation following an acute allergen exposure. However, in a more chronic situation, the airway inflammatory response seems to be only partially mediated by Stat6.
British Journal of Pharmacology (2000) 130, 1581–1588; doi:10.1038/sj.bjp.0703501
以下是对给定文本的中文翻译:
关于Stat6在过敏原诱导的气道炎症中的作用,已有相互矛盾的报道。我们使用在C57BL/6背景生成的野生型和Stat6缺陷小鼠,研究了过敏原吸入程序对炎症反应的影响。
实验动物在第0天和第7天通过腹腔注射进行卵清蛋白(OVA)免疫,然后接受气溶胶化OVA或磷酸盐缓冲液挑战(急性挑战在第14天;慢性挑战在第14、15、16、17和18天),并在不同时间点处死。
在急性挑战后,Stat6缺陷完全消除了血清IgE水平的升高以及肺部炎症(包括炎症细胞浸润、IL-4和IL-5的释放以及血浆外渗的增加)的发展。
在慢性挑战后,尽管缺乏IgE、IL-4和IL-5,Stat6缺陷小鼠仍会发展出特征性肺部炎症,尽管其强度与野生型小鼠相比较小。
仅在接受慢性挑战的野生型小鼠中观察到OVA诱导的早期支气管收缩,而在Stat6缺陷小鼠中这一现象完全消失。
这些结果表明,Stat6信号对于过敏原急性暴露后的过敏性气道炎症的发展至关重要。然而,在更长期的慢性情况下,气道炎症反应似乎仅部分由Stat6介导。
British Journal of Pharmacology (2000) 130, 1581–1588; doi:10.1038/sj.bjp.0703501