评估膜巨细胞对臭氧耐受性的作用
Gregory J Smith1, Morgan Nalesnik2, Robert M Immormino3,4
1Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
概括
对臭氧 (O3) 肺损伤的耐受性涉及细胞变化,但不涉及膜巨细胞. 这项研究发现,虽然O3预暴露减少了肺炎,但耗尽或转移巨细胞并没有影响这种保护作用.
科学领域:
- 环境毒理学环境毒理学
- 肺免疫学 肺免疫学
- 细胞应激反应的细胞应激反应
背景情况:
- 急性臭氧 (O3) 暴露会引起肺炎和损伤.
- 预先暴露于低O3度会产生耐受性,从而减少随后的O3引起的肺损伤.
- 导致O3耐受性的细胞机制在很大程度上是未知的.
研究的目的:
- 研究膜巨细胞 (AMs) 在对急性臭氧诱导的肺炎和损伤的耐受性发展中的作用.
- 在小鼠模型中描述与O3耐受性相关的细胞和分子变化.
主要方法:
- 为O3耐受性研究生成小鼠模型.
- 预先将小鼠暴露在过空气或低度O3中,然后进行高度O3的挑战.
- 呼吸道炎症和损伤的表型,对AM基因表达的评估,AM枯竭和采用AM转移.
主要成果:
- O3 预暴露显著减少了 O3 挑战后的呼吸道炎症和损伤.
- 耐受性与再生性增生症和改变的膜类型2细胞增殖有关.
- 在AM中O3暴露前调节基因表达,降低炎症路径的调节,但AM的耗尽或转移没有影响O3耐受性.
结论:
- 膜巨细胞在调解对臭氧引起的急性肺损伤的耐受性方面没有关键作用.
- 这些发现表明,其他细胞类型或机制负责O3耐受性的发展.
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