期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 103, 期 38, 页码 13932-13937出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0606411103
关键词
allosteric disulfide; protein disulfide; isomerase; S-nitrosylation; G protein-coupled receptor
资金
- NHLBI NIH HHS [P01 HL031950] Funding Source: Medline
Cell-surface tissue factor (TF) binds the serine protease factor VIIa to activate coagulation or, alternatively, to trigger signaling through the G protein-coupled, protease-activated receptor 2 (PAR2) relevant to inflammation and angiogenesis. Here we demonstrate that TF(.)VIIa-mediated coagulation and cell signaling involve distinct cellular pools of TF. The surf ace-accessible, extracellular Cys(186)-Cys(209) disulfide bond of TF is critical for coagulation, and protein disulfide isomerase (PDI) disables coagulation by targeting this disulfide. A TF mutant (TF C209A) with an unpaired Cys(186) retains TF-VIIa signaling activity, and it has reduced affinity for VIIa, a characteristic of signaling TF on cells with constitutive TF expression. We further show that PDI suppresses TF coagulant activity in a nitric oxide-dependent pathway, linking the regulation of TF thrombogenicity to oxidative stress in the vasculature. Furthermore, a unique monoclonal antibody recognizes only the noncoagulant, cryptic conformation of TF. This antibody inhibits formation of the TF(.)PAR2 complex and TF-VIIa signaling, but it does not prevent coagulation activation. These experiments delineate an upstream regulatory mechanism that controls TF function, and they provide initial evidence that TF-VIIa signaling can be specifically inhibited with minimal effects on coagulation.
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