Department of Pathology, University of Texas Medical Branch, Galveston, Texas, USA.
Department of Internal Medicine, Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, USA.
J Biol Chem. 2021 Nov;297(5):101315. doi: 10.1016/j.jbc.2021.101315. Epub 2021 Oct 20.
Coagulopathy is associated with both inflammation and infection, including infections with novel severe acute respiratory syndrome coronavirus-2, the causative agent Coagulopathy is associated with both inflammation and infection, including infection with novel severe acute respiratory syndrome coronavirus-2, the causative agent of COVID-19. Clot formation is promoted via cAMP-mediated secretion of von Willebrand factor (vWF), which fine-tunes the process of hemostasis. The exchange protein directly activated by cAMP (EPAC) is a ubiquitously expressed intracellular cAMP receptor that plays a regulatory role in suppressing inflammation. To assess whether EPAC could regulate vWF release during inflammation, we utilized our EPAC1-null mouse model and revealed increased secretion of vWF in endotoxemic mice in the absence of the EPAC1 gene. Pharmacological inhibition of EPAC1 in vitro mimicked the EPAC1-/- phenotype. In addition, EPAC1 regulated tumor necrosis factor-α-triggered vWF secretion from human umbilical vein endothelial cells in a manner dependent upon inflammatory effector molecules PI3K and endothelial nitric oxide synthase. Furthermore, EPAC1 activation reduced inflammation-triggered vWF release, both in vivo and in vitro. Our data delineate a novel regulatory role for EPAC1 in vWF secretion and shed light on the potential development of new strategies to control thrombosis during inflammation.
凝血功能障碍与炎症和感染有关,包括新型严重急性呼吸综合征冠状病毒 2 感染,即 COVID-19 的病原体。cAMP 介导的血管性血友病因子(vWF)分泌促进血栓形成,vWF 精细调节止血过程。cAMP 直接激活交换蛋白(EPAC)是一种广泛表达的细胞内 cAMP 受体,在抑制炎症中发挥调节作用。为了评估 EPAC 是否可以在炎症期间调节 vWF 的释放,我们利用 EPAC1 基因敲除小鼠模型,揭示了在没有 EPAC1 基因的情况下,内毒素血症小鼠中 vWF 的分泌增加。体外 EPAC1 药理学抑制模拟了 EPAC1-/-表型。此外,EPAC1 通过炎症效应分子 PI3K 和内皮型一氧化氮合酶调节肿瘤坏死因子-α触发的人脐静脉内皮细胞 vWF 分泌。此外,EPAC1 的激活减少了体内和体外炎症触发的 vWF 释放。我们的数据描绘了 EPAC1 在 vWF 分泌中的新的调节作用,并为控制炎症期间血栓形成的新策略的潜在发展提供了线索。