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感应病原体的血细胞状树突细胞通过干扰素-α刺激动脉样硬化斑块中的细胞毒性T细胞功能
Alexander Niessner1, Kayoko Sato, Elliot L Chaikof
1Kathleen B. and Mason I. Lowance Center for Human Immunology, Emory University School of Medicine, 101 Woodruff Circle, Atlanta, GA 30322, USA.
动脉硬性斑块中的等离子体树突细胞 (pDC) 感知微生物信号并增强T细胞杀死血管细胞,将感染与斑块不稳定性联系起来. 这突显了动脉样硬化病变的新奇机制.
科学领域:
- 免疫学 免疫学 免疫学
- 心血管研究研究心血管研究
- 动脉样硬化的发病因子
背景情况:
- 不稳定的动脉样硬化斑块涉及诸如巨细胞和T细胞等炎症细胞.
- 调节炎性细胞激活和斑块破裂的信号仍然不清楚.
- 人们怀疑传染病发作会增加斑块的脆弱性.
研究的目的:
- 研究血类树突细胞 (pDCs) 在动脉样硬化斑块内调节T细胞功能中的作用.
- 通过pDCs探索宿主感染和斑块不稳定之间的联系.
主要方法:
- 在人动脉动动脉瘤中识别和定位pDCs.
- 测量干扰素-α (IFN-α) 转录度的测量.
- 对病原体衍生动机 (CpG寡氧核酸) 的pDC反应的评估.
- 评估IFN-alpha对T细胞功能和血管光滑肌肉细胞死亡的影响.
主要成果:
- 在53%的喉动脉动脉瘤中发现了pDCs,产生IFN-alpha.
- IFN-α水平与斑块不稳定性有很强的相关性.
- 斑块pDCs对微生物动机的反应增加了IFN-alpha的产生.
- IFN-alpha显著增加了CD4 T细胞上的TRAIL表达,增强了它们杀死血管光滑肌细胞的能力.
结论:
- 动脉样硬化斑块中的pDC检测微生物信号.
- pDCs放大T细胞介导的细胞毒性,将感染与动脉样硬化并发症联系起来.
- 这提供了一种机制,将宿主感染与动脉样硬化的急性免疫媒介事件联系起来.
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