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Clinica Chimica Acta:cFBG存在时形成的纤维蛋白网络可能影响止血反应?

2020-02-06 MedSci MedSci原创

在炎性疾病患者中已检测到瓜氨酸化纤维蛋白原(cFBG)。瓜氨酸化是指蛋白质中精氨酸翻译后转化为瓜氨酸的过程。该反应是由肽基氨酸脱亚胺酶(PAD)催化的,其中存在五种亚型。纤维蛋白原是PAD2和PAD4的底物。在纯化系统中,已知cFBG可以抑制纤维蛋白肽A (FPA)和B (FPB)的释放,并损害纤维蛋白聚合。然而,cFBG对血浆中纤维蛋白结构和纤维蛋白溶解的影响尚不清楚。我们假设纤维蛋白原的瓜氨酸

在炎性疾病患者中已检测到瓜氨酸化纤维蛋白原(cFBG)。瓜氨酸化是指蛋白质中精氨酸翻译后转化为瓜氨酸的过程。该反应是由肽基氨酸脱亚胺酶(PAD)催化的,其中存在五种亚型。纤维蛋白原是PAD2PAD4的底物。在纯化系统中,已知cFBG可以抑制纤维蛋白肽A (FPA)B (FPB)的释放,并损害纤维蛋白聚合。然而,cFBG对血浆中纤维蛋白结构和纤维蛋白溶解的影响尚不清楚。我们假设纤维蛋白原的瓜氨酸化会影响纤维蛋白的特性。

研究人员用重组PAD2PAD4对纤维蛋白原进行瓜氨酸化。用浑浊度测量法研究了含cFBG或天然纤维蛋白原的纤维蛋白原缺乏血浆中cFBG对纤维蛋白结构的影响。研究结果显示,PAD2以剂量依赖性地降低纤维蛋白原的瓜氨酸化,还降低了纤维蛋白聚合的速度,同时,降低了纤维蛋白的整体止血能力,降低了纤维蛋白形成的最大速度,并降低了纤维蛋白的质量/长度比,以及降低了纤维蛋白凝块的溶解率。

研究结果表明,PAD2对纤维蛋白原的瓜氨酸化不仅影响纤维蛋白聚合,而且影响纤维蛋白纤维的性质,提示cFBG存在时形成的纤维蛋白网络可能影响止血反应。我们的结果表明,纤维蛋白原的瓜氨酸化改变了纤维蛋白纤维的组成,从而可能导致纤维蛋白网络更松散,更容易发生纤维蛋白溶解,从而影响止血平衡。

原始出处:

Tyrillshall DamianaDres DamgaardCitrullination of fibrinogen by peptidylarginine deiminase 2 impairs fibrin clot structure

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    2020-06-26 windight
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    2020-02-08 jeanqiuqiu
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