托尔式受体3通过化的保存机制调解大动脉狭窄
Can Gollmann-Tepeköylü1, Michael Graber1, Jakob Hirsch1
1Department of Cardiac Surgery (C.G.-T., M.G, J.H., S.M., L.P., F.N., E.K., N.F., D. Lobenwein, V.S., J.E., M.G., J.H.), Medical University of Innsbruck, Austria.
Circulation
|April 4, 2023
概括
托尔类受体3 (TLR3) 调节大动脉中的化. 比格利干 (BGN) 激活TLR3,促进了膜细胞的骨形成,并导致了动脉疾病 (CAVD).
科学领域:
- 分子生物学和免疫学
- 心血管研究
- 骨生物学
背景情况:
- 动脉疾病 (CAVD) 涉及膜间细胞转化为骨形成细胞.
- 托尔类受体 (TLRs) 是先天免疫和组织修复的关键.
- I型干扰素 (IFN) 对抗病毒反应和骨形成至关重要.
研究的目的:
- 通过I型IFN信号传递,研究大动脉内源性TLR3配体是否促进骨质细胞样细胞的产生.
- 确定连接TLR3,IFN和CAVD病变的分子机制.
主要方法:
- 用机械应力或TLR3激动剂刺激人类膜间细胞.
- 分析了基因表达,IFN信号和骨形成;抑制剂划分了途径.
- 在模型和免疫沉中验证了连体受体相互作用;使用了淘汰小鼠和斑马鱼模型;对人类队列 (GERA,英国生物库) 进行了基因关联分析.
主要成果:
- TLR3被确定为膜化的关键调节剂.
- Biglycan (BGN) 被发现是一种内源的TLR3激动剂,需要通过xylosyltransferase 1 (XYLT1) 进行翻译后成熟.
- 通过TLR3依赖的I型IFN信号传递,BGN诱导了间细胞转化为骨质细胞;缺乏BGN,Tlr3和Ifnar1的小鼠显示出对CAVD和骨形成受损的保护. 在人类群体中,XYLT1- BGN- TLR3- IFNAR1通路的遗传变异与CAVD有关.
结论:
- 比格利坎 (BGN) -TLR3-IFNAR1轴是调节大动脉结石化的进化保存途径.
- 这一途径代表了预防CAVD的潜在治疗目标.
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