Lancet Respirat Med:MUC5B启动子的多态性和端粒长度在慢性高敏性肺炎中有什么样的作用?

2017-06-23 qinqiyun MedSci原创

高敏性肺炎患者易发展成进行性肺纤维化,进而导致生存期减短。在多发性的家系里,某些个体可被诊断先天性肺纤维化(IPF)或慢性高敏性肺炎,这两种疾病有相同的风险因子。那么与IPF有关的基因风险因子是否也与慢性高敏性肺炎患者的纤维化进程和生存期减短有关?

背景:慢性高敏性肺炎患者易发展成进行性肺纤维化,进而导致生存期减短。在多发性的家系里,某些个体可被诊断先天性肺纤维化(IPF)或慢性高敏性肺炎,这两种疾病有相同的风险因子。Brett Ley及其同事致力于探究与IPF有关的基因风险因子是否也与慢性高敏性肺炎患者的纤维化进程和生存期减短有关。

方法:Brett Ley及其同事对两个独立的慢性高敏性肺炎患者队列(UCSF和UTSW)进行观察性研究,检测与IPF相关的两个常见单核苷酸(MUC5B rs35705950和TOLLIP rs5743890)的多态性以及外周血白细胞的端粒长度,并评估其与慢性高敏性肺炎风险、生存期、临床表现、影像特征和病理特点的相关性。将两个队列中获得的数据与健康对照的数据进行比较。

结果:队列UCSF中145位患者,队列UTSW中有72位患者。与对照组相比,慢性高敏性肺炎患者的MUC5B rs35705950 次要等位基因频率(MAF)更高(UCSF 24·4% 和 UTSW 32·3%vs 10·7%, 均 p<0·0001);但是对于TOLLIP rs5743890则无此现象。结合UCSF和UTSW两个队列发现,放射性纤维化的范围与MUC5B rs35705950 次要等位基因和短的端粒长度之间的相关联。端粒长度短于其年龄对应的十分之一时与生存期减短高度相关。

分析:MUC5B rs35705950 和缩短的端粒长度与纤维化范围、普通型间质性肺炎的病理特征和慢性高敏性肺炎患者的生存期缩短之间的关联提示慢性高敏性肺炎与先天性肺纤维化(IPF)病理过程相似,这一发现或许可以帮助慢性高敏性肺炎患者规避发展成进行性肺纤维化的风险。

原始出处:
Brett Ley,Chad A Newton,Isabel Arnould,et al.The MUC5B promoter polymorphism and telomere length in patients with chronic hypersensitivity pneumonitis: an observational cohort-control study.The Lancet.22 June 2017.http://dx.doi.org/10.1016/S2213-2600(17)30216-3.

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    2017-07-02 howi
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    2017-06-25 xzw120