通过整合素αvβ3识别24-(S) - 基胆固醇的分子基础
Jeevan B Gc1, Justin Chen1, Swechha M Pokharel2
1Department of Pharmaceutical Sciences, College of Pharmacy and Pharmaceutical Sciences, Washington State University, Spokane, WA, 992020, USA.
Scientific reports
|June 6, 2023
概括
24-(S) - 胆固醇 (24HC) 与整合素αvβ3结合,激活焦粘附激酶 (FAK) 和NFκB通路. 这种氧胆固醇促进了一种促炎反应,类似于25-胆固醇 (25HC).
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 氧化醇,如25-胆固醇 (25HC),具有生物活性,并与免疫反应有关.
- 以前的研究表明25HC激活了整合素-焦点粘附激酶 (FAK) 途径,诱导诸如瘤死因子-α (TNF) 和互白素-6 (IL-6) 等促炎介质.
- 24-(S) - 基胆固醇 (24HC) 是25HC的一个结构异构体,对大脑胆固醇稳定至关重要,并与阿尔茨海默病等炎症性疾病有关.
研究的目的:
- 调查24HC是否可以诱导非神经元细胞的炎症反应,类似于25HC.
- 阐明24HC介导免疫激活背后的分子机制.
主要方法:
- 在分子建模中,分析24HC与整合素的结合.
- 表面等离子体共振 (SPR) 用于确定24HC与整合素αvβ3.3的结合亲和力.
- 使用巨细胞进行体外研究,以评估信号通路激活和细胞因子生产.
主要成果:
- 24HC与整合素αvβ3结合在一个不同的位点 (位点II),其亲和力低于25HC,导致形状变化.
- 24HC激活了FAK和核因子kappa B (NFκB) 信号通路.
- 经24HC处理的巨细胞表现出增强的促炎性细胞因子TNF的产生.
结论:
- 24HC,像25HC一样,通过与整合素αvβ3.3结合,起到促炎作用.
- 整合素-FAK-NFκB通路调解24HC诱导的TNF产生.
- 这项研究将24HC确定为一种能够触发先天性免疫反应的新型氧.
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