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一种新型的蛇毒C型瘦素样蛋白通过准威尔布兰德因子和凝血因子IX来调节血液凝结
Fan-Yu Zeng1,2,3, Ren-Sheng Ji3,4, Xiao-Qin Yu1,2,3
1State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China.
Scientific reports
|October 3, 2024
概括
一种新的蛇毒蛋白质,protocetin,可以激活血小板和凝血因子IX. 这种双重作用在体内调节血液凝固,为C型乳素样蛋白 (CLP) 提供了新的见解.
科学领域:
- 生物化学 生物化学
- 药理学 药理学是指药理学的学科.
- 毒理学 毒理学 毒理学
背景情况:
- 蛇毒C型甲酸样蛋白 (CLPs) 是一种非酶性蛋白质.
- 没有先前报告的CLP表现出血小板和凝血因子激活活性.
研究的目的:
- 为了识别和表征一种来自Protobothrops mucrosquamatus毒液 (PMV) 的新型CLP,具有双重静血功能.
- 研究原生素对血小板和凝血的作用背后的分子机制.
主要方法:
- 从PMV中净化原丁.
- 原素的生物化学表征,包括亚单元分析和N-终端测序.
- 在体外测定血小板聚合和凝血因子激活.
- 在小鼠体内研究以评估静血效应和潜在毒性.
主要成果:
- 纯素,一个29.986 kDa的CLP,被净化,发现由α-和β-链组成.
- 原素通过与·威尔布兰德因子 (vWF) - 糖蛋白Ib (GPIb) 复合体结合来激活血小板.
- 普罗托塞丁通过与凝血因子IX结合来激活内在凝血路径.
- 活体研究显示血小板激活,血小板数量减少,出血时间延长,激活部分血栓形成时间延长 (APTT) 和纤维素原水平降低.
- 在测试剂量下,主要器官中没有观察到微血栓形成.
结论:
- 普罗托塞丁是一种来自PMV的新型CLP,具有独特的双重功能:激活血小板和凝固因子IX.
- 在体内,protocetin调节凝血,在不诱导即时微血栓形成的情况下显示出显著的抗凝血作用.
- 这一发现增强了对蛇毒CLP结构功能关系及其在血液静止中的复杂作用的理解.
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