血小板蛋白二硫化异构酶在血栓炎症条件下促进糖蛋白IBα介导的血小板- 中性粒细胞相互作用
Jing Li1, Kyungho Kim1,2, Si-Yeon Jeong1
1Department of Pharmacology, University of Illinois College of Medicine, Chicago (J.L., K.K., S.-Y.J, B.X., X. Du, J. Cho).
Circulation
|December 28, 2018
概括
血小板蛋白二硫化酶 (PDI) 通过减少二硫化键来激活血小板糖蛋白Ibα (GPIbα). 这种PDI- GPIbα相互作用促进了血小板- 中性粒细胞相互作用和血管封闭.
科学领域:
- 生物化学
- 血液学
- 分子生物学
背景情况:
- 血小板与中性粒细胞的相互作用在血栓炎症性疾病中至关重要,导致血管封闭和组织损伤.
- 血小板糖蛋白Ibα (GPIbα) 是参与这些细胞相互作用的关键受体.
- 据认为,GPIbα对配体结合具有构成性活性.
研究的目的:
- 研究血小板衍生蛋白二硫化异构酶 (PDI) 在调节GPIbα功能中的作用.
- 阐明 PDI 影响 GPIbα 配体结合活性的机制.
- 确定PDI-GPIbα信号在血栓炎症疾病中的病理生理意义.
主要方法:
- 生物信息分析以确定GPIbα中潜在的二硫化物键.
- 在体外测定包括凝结,流细胞测量和表面等离子体共振.
- 使用动物模型 (状细胞病,中风) 和实时显微镜的体内研究.
主要成果:
- PDI直接与血小板表面的GPIbα相互作用,减少关键的二硫化键 (Cys4-Cys17和Cys209-Cys248).
- 删除或抑制血小板PDI显著损害了GPIbα介导的血小板聚合和连接.
- 在疾病模型中,PDI调节的GPIbα功能对于血小板与中性粒细胞相互作用,血管封闭和组织损伤至关重要.
结论:
- 通过裂解各二硫化物键,PDI作为GPIbα功能的关键调节剂.
- 这种PDI介导的GPIbα激活促进了血小板与中性粒细胞的相互作用,血管封闭和组织损伤.
- 针对PDI- GPIbα轴为血栓炎症疾病提供了潜在的治疗策略.
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