p47phox deficiency impairs platelet function and protects mice against arterial and venous thrombosis

p47phox deficiency impairs platelet function and protects mice against arterial and venous thrombosis
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p47phox 缺乏会损害血小板功能并保护小鼠免受动脉和静脉血栓形成

DOI:
10.1016/j.redox.2020.101569
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发表时间:
2020-05
期刊:
影响因子:
11.4
通讯作者:
Qiao Jianlin
Qiao Jianlin
中科院分区:
生物学1区
文献类型:
--
作者:
Wang Xiamin;Zhang Sixuan;Ding Yangyang;Tong Huan;Xu Xiaoqi;Wei Guangyu;Chen Yuting;Ju Wen;Fu Chunling;Qi Kunming;Li Zhenyu;Zeng Lingyu;Xu Kailin;Qiao Jianlin

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NADPH 氧化酶衍生的活性氧 (ROS) 调节血小板功能和血栓形成。关于 NOX2 在血小板功能中的作用仍存在争议。作为 NOX2 的调节亚基,p47phox 是否调节血小板功能仍不清楚。我们的研究旨在评估 p47phox 在血小板功能中的作用。从野生型或 p47phox-/- 小鼠中分离血小板,然后分析血小板聚集、颗粒分泌、表面受体表达、扩散、凝块回缩和 ROS 生成。此外,还评估了体内止血、动脉和静脉血栓形成。此外,用 PR-39 处理人血小板以抑制 p47phox 活性,然后分析血小板功能。 p47phox缺陷显着延长尾部出血时间、延迟体内动脉和静脉血栓形成以及减少血小板聚集、ATP释放和αIIbβ3激活。此外,p47phox-/-血小板在纤维蛋白原或胶原蛋白上的扩散受损,并且伴随着 Syk 和 PLCγ2 磷酸化的降低而出现血栓回缩缺陷。此外,CRP 或凝血酶刺激的 p47phox-/-血小板显示细胞内 ROS 生成减少,在抑制 NOX1 后进一步减少。同时,p47phox缺陷增加了VASP磷酸化并减少了ERK1/2、p38、ERK5和JNK的磷酸化,而不影响AKT和c-PLA2磷酸化。此外,在 CRP 或凝血酶刺激后,p47phox 易位到膜上与 NOX1 和 NOX2 相互作用。最后,PR-39 抑制 p47phox 活性可减少人血小板中 ROS 的产生、血小板聚集和凝块收缩。总之,p47phox调节血小板功能、动静脉血栓形成和ROS生成,表明p47phox可能成为治疗血栓或心血管疾病的新治疗靶点。
NADPH oxidase-derived reactive oxygen species (ROS) regulates platelet function and thrombosis. It remains controversial regarding NOX2’s role in platelet function. As a regulatory subunit for NOX2, whether p47phoxregulates platelet function remains unclear. Our study intends to evaluate p47phox’s role in platelet function. Platelets were isolated from wild-type or p47phox-/-mice followed by analysis of platelet aggregation, granule secretion, surface receptors expression, spreading, clot retraction and ROS generation. Additionally,in vivohemostasis, arterial and venous thrombosis was assessed. Moreover, human platelets were treated with PR-39 to inhibit p47phoxactivity followed by analysis of platelet function. p47phoxdeficiency significantly prolonged tail-bleeding time, delayed arterial and venous thrombus formationin vivoas well as reduced platelet aggregation, ATP release and αIIbβ3 activation. In addition, p47phox-/-platelets presented impaired spreading on fibrinogen or collagen and defective clot retraction concomitant with decreased phosphorylation of Syk and PLCγ2. Moreover, CRP or thrombin-stimulated p47phox-/-platelets displayed reduced intracellular ROS generation which was further decreased after inhibition of NOX1. Meanwhile, p47phoxdeficiency increased VASP phosphorylation and decreased phosphorylation of ERK1/2, p38, ERK5 and JNK without affecting AKT and c-PLA2 phosphorylation. Furthermore, p47phoxtranslocates to membrane to interact with both NOX1 and NOX2 after stimulation with CRP or thrombin. Finally, inhibition of p47phoxactivity by PR-39 reduced ROS generation, platelet aggregation and clot retraction in human platelets. In conclusion, p47phoxregulates platelet function, arterial and venous thrombus formation and ROS generation, indicating that p47phoxmight be a novel therapeutic target for treating thrombotic or cardiovascular diseases.
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