Blood:研究揭示肝切除术后肝内纤维蛋白原沉积促进肝脏再生

2020-03-18 MedSci原创 MedSci原创

啮齿动物和人类在部分肝切除术后,血小板在刺激肝脏再生中起关键作用。抑制血小板后,啮齿动物的肝脏再生会延迟。但是,血小板积累和促进肝脏再生的确切机制仍不确定。最近报道了小鼠部分肝切除术(PHx)后凝血酶

啮齿动物和人类在部分肝切除术后,血小板在刺激肝脏再生中起关键作用。抑制血小板后,啮齿动物的肝脏再生会延迟。但是,血小板积累和促进肝脏再生的确切机制仍不确定。最近报道了小鼠部分肝切除术(PHx)后凝血酶依赖性肝内纤维蛋白(原)的沉积,但尚未研究纤维蛋白(原)沉积在肝脏再生中的作用。

 

本研究中,我们检验了纤维蛋白(原)通过促进肝内血小板积累促进肝再生的假说,并确定了PHx后肝内快速凝结的触发因素。野生型小鼠的PHx触发了肝内快速凝结,肝内纤维蛋白(原)沉积证明了这一点。

 

在肝特异性组织因子缺乏的小鼠中,肝内纤维蛋白(原)沉积被消除,从而明确了PHx后凝血的触发因素。PHx后,通过蛋白酶激活的受体4对血小板的直接凝血酶激活没有促进肝细胞增殖,这表明凝血酶主要通过驱动肝内纤维蛋白(原)沉积来促进肝脏再生。纤维蛋白原与丙烯腈的消耗减少了PHx后肝内血小板的积累和肝细胞的增殖,这表明纤维蛋白(原)通过促进肝内血小板的积累而促进了PHx后的肝再生。与小鼠血纤维蛋白原的保护功能一致,术后血浆血浆纤维蛋白原水平低与肝切除患者的肝功能障碍和死亡率有关。此外,肝切除术后患者的肝脏中肝内纤维蛋白(原)沉积增加明显,但切除后显示肝功能障碍的患者则明显缺乏。

 

综上所述,该研究结果表明,PHx后凝血依赖性肝内纤维蛋白(原)沉积可驱动血小板积累和肝再生的新机制。

 

原始出处:

Dafna GroeneveldDavid Pereyra, et al., Intrahepatic fibrin(ogen) deposition drives liver regeneration after partial hepatectomy in mice and humans. Blood. 2019 Mar 14; 133(11): 1245–1256. doi: 10.1182/blood-2018-08-869057

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    2020-05-02 changfy
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