期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms8835
关键词
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资金
- National Health and Medical Research Council (NHMRC) of Australia [APP1028564, APP1048574]
- Australian Research Council [LE120100043]
- National Institutes of Health-National Heart, Lung and Blood Institute-of the Unites States of America [HL-42846]
- MERU Foundation
- Australian Research Council [LE120100043] Funding Source: Australian Research Council
Thrombin is a central regulator of leukocyte recruitment and inflammation at sites of vascular injury, a function thought to involve primarily endothelial PAR cleavage. Here we demonstrate the existence of a distinct leukocyte-trafficking mechanism regulated by components of the haemostatic system, including platelet PAR4, GPIba and fibrin. Utilizing a mouse endothelial injury model we show that thrombin cleavage of platelet PAR4 promotes leukocyte recruitment to sites of vascular injury. This process is negatively regulated by GPIba, as seen in mice with abrogated thrombin-platelet GPIb alpha binding (hGPIb alpha(D277N)). In addition, we demonstrate that fibrin limits leukocyte trafficking by forming a physical barrier to intravascular leukocyte migration. These studies demonstrate a distinct 'checkpoint' mechanism of leukocyte trafficking involving balanced thrombin interactions with PAR4, GPIb alpha and fibrin. Dysregulation of this checkpoint mechanism is likely to contribute to the development of thromboinflammatory disorders.
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