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细胞内受体 EPAC 通过 PI3K/eNOS 依赖性途径调节内皮细胞在炎症过程中 von Willebrand 因子的分泌。

Intracellular receptor EPAC regulates von Willebrand factor secretion from endothelial cells in a PI3K-/eNOS-dependent manner during inflammation.

机构信息

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.

出版信息

J Biol Chem. 2021 Nov;297(5):101315. doi: 10.1016/j.jbc.2021.101315. Epub 2021 Oct 20.

Abstract

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.

摘要

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。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1166/8592879/506bd5dfa0b7/gr1.jpg

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