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胆固醇外流途径抑制炎症酶激活,NETosis和动脉生成
Marit Westerterp1,2, Panagiotis Fotakis1, Mireille Ouimet3,4
1Division of Molecular Medicine (M.W., P.F., A.E.B., M.M.M., W.W., S.A., N.W., C.L.W., A.R.T.).
Circulation
|March 29, 2018
概括
胆固醇在骨髓细胞中的积累激活NLRP3炎症体,驱动中性粒细胞活动和动脉硬化斑块的形成. 这一途径在坦吉尔病患者中很重要,突出显示了胆固醇,炎症和心血管风险之间的联系.
科学领域:
- 心血管科学
- 免疫学
- 分子生物学
背景情况:
- 在之前心肌梗塞和炎症的患者中,CANTOS试验表明阻断interleukin (IL) - 1β可以减少心血管事件.
- 这表明IL-1β分泌途径有助于心血管风险.
- 由于胆固醇在骨髓细胞中积累而激活的NLRP3炎症酶,产生IL-1β和IL-18,但其在动脉样硬化中的作用尚未完全理解.
研究的目的:
- 研究NLRP3炎症酶激活与动脉样硬化的机制.
- 探索胆固醇转运体ATP结合盒A1和G1 (ABCA1/G1) 在炎症酶激活和心血管疾病中的作用.
主要方法:
- 患有骨髓特异性Abca1/ g1缺乏的小鼠与Nlrp3或Caspase-1/11缺乏的小鼠交叉.
- 这些小鼠的骨髓被移植到接受西方饮食的患者体内.
- 分析了血IL-18水平,细胞细胞因子分泌,动脉样损伤大小,中性粒细胞透和中性粒细胞细胞外陷 (NET) 的形成.
主要成果:
- 骨髓体Abca1/ g1缺乏导致血IL-18的增加和IL-1β/ IL-18的增强分泌,表明NLRP3炎症酶的激活.
- 缺乏Nlrp3或Caspase-1/11可以逆转这些影响,并减少动脉样硬化病变的大小.
- 炎症酶激活促进了动脉样硬化斑块中的中性粒细胞积累和NET形成,与全身炎症有关.
- 骨髓体Abca1/ g1缺陷也激活了非正规的炎症体,增加了对内毒素的敏感性.
- 患有丹吉尔病 (ABCA1功能丧失) 的患者血IL-1β和IL-18水平升高.
结论:
- 骨髓细胞胆固醇的积累激活了NLRP3炎症体,促进了中性粒细胞的招募和动脉样硬化中的NET形成.
- 这些发现表明一种新的机制将胆固醇代谢,炎症酶激活和心血管疾病的进展联系在一起.
- 在坦吉尔病患者中观察到的炎症酶激活突显了这些发现的临床意义.
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