来自受压力的β细胞的细胞外囊泡调解单细胞激活,并导致岛屿炎症
Mette C Dekkers1, Joost M Lambooij1,2, Xudong Pu1
1Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, Netherlands.
Frontiers in immunology
|August 8, 2024
概括
受到压力的β细胞释放出细胞外囊泡 (EVs),在1型糖尿病 (T1D) 中促进炎症. 这些携带特定微RNA的EV激活免疫细胞,导致岛屿破坏和T1D进展.
科学领域:
- 免疫学 免疫学 免疫学
- 内分泌学 在内分泌学.
- 细胞生物学 细胞生物学
背景情况:
- 1型糖尿病 (T1D) 涉及由炎症和自身免疫驱动的β细胞破坏.
- 贝塔细胞现在被认为是自我毁灭的积极参与者,受到小岛微环境压力的影响.
- 贝塔细胞内质网膜 (ER) 应激增强了它们的免疫性,细胞外囊泡 (EV) 可能调解免疫细胞相互作用.
研究的目的:
- 研究细胞应激在T1D早期发育中的作用.
- 通过调节HSPA5表达,模拟β细胞中的构成性ER应激.
- 描述EV miRNA货物及其对先天免疫细胞的影响.
主要方法:
- 通过改变HSPA5表达,在EndoC-βH1细胞中生成具有构成性ER应激的细胞模型.
- 分析了受压力的β细胞的转录组和EV miRNA载荷.
- 评估了β细胞衍生的EVs对初级人类单细胞的影响.
主要成果:
- HSPA5 knockdown 诱导了未折叠蛋白质响应 (UPR) 途径和改变了 EV miRNA 含量,减少了与 IL-1β 信号相关的 miRNA.
- 来自应激β细胞的EV增加了CD11b,HLA-DR,CD40和CD86.6的单细胞表达.
- 用这些EV进行治疗可提高单细胞中的IL-1β和IL-6的产生.
结论:
- 来自受压力的β细胞的细胞外囊泡可以调解岛屿炎症.
- EV货物,特别是miRNA,在β细胞和免疫细胞之间的交叉声中发挥作用.
- 这些发现突出了一个新的机制,有助于T1D的发病.
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