J Allergy Clin Immun:艾蒿花粉是内毒素空气传播的主要载体

2019-04-19 申昆玲 中国儿童哮喘行动计划

背景:内毒素(LPS)由革兰氏阴性菌释放,可引起强烈的免疫反应和炎症反应。当在空气中播散时可能导致呼吸系统疾病,如过敏性哮喘。

背景:内毒素(LPS)由革兰氏阴性菌释放,可引起强烈的免疫反应和炎症反应。当在空气中播散时可能导致呼吸系统疾病,如过敏性哮喘。

目的:我们试图确定空气中内毒素的来源以及内毒素对致敏的影响。

方法:我们连续4年在慕尼黑(德国)和达沃斯(瑞士)每天测定室外空气中的LPS水平。从空气中取样,测定直径>10mm的颗粒物(PM)(PM> 10mm),直径在2.5和10mm之间颗粒物的水平(2.5<PM<10mm)。

结果:1年中超过60%的内毒素量在PM> 10mm颗粒物中检测到的,表明细菌并非是独立存在或聚集成团播散而是粘附于大颗粒物。在慕尼黑,在6月12日到8月28日的暴露量占年暴露量的70%。多元建模表明,内毒素水平可以通过物候参数(即植物生长)解释。实际上,空气中日较高内毒素水平和空气中蒿属植物花粉浓度有关。整个欧洲(100个地点)采集的花粉数据显示在艾蒿花粉中检测到最高内毒素水平,其他花粉中很少。微生物组分析表明,艾蒿花粉上的LPS浓度与假单胞菌属和泛酸菌属的存在有关。在过敏性疾病的小鼠模型中,致敏需要在艾蒿花粉上存在LPS。

结论:空气中大部分传播的内毒素来源于细菌,并可仅借助一种植物的花粉播散:艾蒿。LPS对于诱导肺部炎症和过敏致敏是必需的。

原始出处:
Oteros J1, Bartusel E2, Alessandrini F1, et al.Artemisia pollen is the main vector for airborne endotoxin.J Allergy Clin Immunol. 2019 ;143(1):369-377.e5.

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    2019-12-21 mei539
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    2019-04-21 膀胱癌
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