巨细胞中的ApoE表达传递免疫代谢信号,通过细胞外囊泡控制超脂血症驱动的血液形成和炎症
Tuan Anh Phu1,2, Martin Ng1,2, Ngan K Vu1,2
1Department of Veterans Affairs, Surgical Service (112G), San Francisco VA Medical Center, San Francisco, California, USA.
Journal of extracellular vesicles
|August 18, 2023
概括
巨细胞细胞外囊中的Apolipoprotein E (apoE) 调节免疫细胞代谢和炎症. 表达ApoE的囊泡减少炎症并改善细胞代谢,而缺乏ApoE的囊泡促进炎症反应.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 代谢调节 代谢调节 代谢调节
背景情况:
- 已知骨髓细胞表达的阿波利波蛋白E (apoE) 能调节炎症.
- 细胞外囊泡 (EVs) 在调解apoE这些抗炎功效方面的作用尚不清楚.
- 调查巨细胞衍生的EV如何影响受体细胞功能和全身炎症至关重要.
研究的目的:
- 要确定在巨细胞衍生的细胞外囊泡 (EVs) 中的阿波利波蛋白E (apoE) 表达是否影响它们的免疫代谢信号特性.
- 阐明EV中ApoE影响受体髓状细胞代谢,炎症和T细胞激活的机制.
- 评估表达apoE的EVs在解决体内炎症中的治疗潜力.
主要方法:
- 从野生型 (WT) 和apoE缺陷 (EKO) 小鼠的骨髓衍生的巨细胞中生成和特征化细胞外囊泡 (EVs).
- 评估了WT-BMDM-EVs和EKO-BMDM-EVs对受体髓状细胞信号的影响,包括NF-κB通路,微RNA (miR-146a-5p,miR-142a-3p) 水平和代谢通路 (粮农组织,OxPHOS).
- 评估了EVs对CD4+T淋巴细胞激活和表型的影响,并将EVs给高脂血症小鼠,以评估体内免疫调节和抗炎作用.
主要成果:
- 通过对apoE和miR-146a-5p进行上调,抑制NF-κB信号传递,并通过miR-142a-3p/CPT1A轴增强脂肪酸氧化 (FAO) 和氧化酸化 (OxPHOS),WT-BMDM-EV赋予了抗炎性质.
- EKO-BMDM-EVs促进了促炎反应,增加了葡萄糖吸收,有氧糖解,氧化应激,并损害了FAO/OxPHOS,同时也推动了T细胞激活到Th1表型.
- 在体内,WT-BMDM-EVs在高脂血症小鼠中解决了炎症,而EKO-BMDM-EVs加剧了炎症反应并改变了血液形成.
结论:
- 巨细胞细胞外囊中的Apolipoprotein E表达对于它们的免疫代谢调节功能至关重要.
- 涉及miR-146a-5p和miR-142a-3p转录轴的EV介导信号决定受体细胞的代谢两极化和炎症状态.
- 巨细胞EV代表了调节免疫反应和代谢功能障碍的新治疗途径,apoE是它们有效性的关键决定因素.
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