血细胞树突细胞感知自我DNA与抗菌素结合
Roberto Lande1, Josh Gregorio, Valeria Facchinetti
1Department of Immunology, M. D. Anderson Cancer Center, University of Texas, Houston, Texas 77030, USA.
Nature
|September 18, 2007
概括
抗微生物LL37通过使自身DNA触发Toll类受体9来激活血类树突细胞 (pDCs). 这种机制解释了对自我DNA的天生的耐受性如何在牛皮等自身免疫性疾病中崩.
科学领域:
- 免疫学 免疫学 免疫学
- 皮肤病学 皮肤病学
- 分子生物学分子生物学
背景情况:
- 等离子体树突细胞 (pDCs) 对于天生的免疫至关重要,通过内体的Toll-like受体 (TLRs) 感知微生物DNA,产生1型干扰素.
- 通常情况下,pDCs不会对自我DNA作出反应,这是预防自身免疫的关键机制.
- 在自身免疫性疾病中,这种自我-DNA耐受性的分解是不太了解的.
研究的目的:
- 在牛皮中识别通过自我DNA调解pDC激活的关键因素.
- 阐明自我DNA在自身免疫条件下触发pDC反应的机制.
主要方法:
- 研究了抗微生物LL37 (CAMP) 在pDC激活中的作用.
- 分析了LL37与自身DNA的相互作用及其对TLR9信号传递的影响.
- 研究了pDCs中的LL37-DNA复合体的细胞局部化和传递.
主要成果:
- 确定LL37是牛皮中pDC激活的关键媒介.
- LL37与自身DNA结合,形成聚合结构,这些结构可以有效地传递到早期内分泌体并保留在早期内分泌体中.
- 这些LL37-DNA复合体强烈触发托尔类受体9 (TLR9) 信号,导致干扰素的产生.
结论:
- LL37将惰性的自我DNA转化为强大的免疫刺激,打破了先天的耐受性.
- 这种LL37介导的途径是驱动牛皮中pDC激活的基本机制.
- 这些发现表明,自免疫性疾病的新疗法目标涉及自我DNA识别.
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