Abstract
Protease-activated receptors (PARs) are G protein-coupled receptors that are activated by proteolytical cleavage of the amino-terminus and thereby act as sensors for extracellular proteases. While coagulation proteases activate PARs to regulate hemostasis, thrombosis, and cardiovascular function, PAR2 is also activated in extravascular locations by a broad array of serine proteases, including trypsin, tissue kallikreins, coagulation factors VIIa and Xa, mast cell tryptase, and transmembrane serine proteases. Administration of PAR2-specific agonistic and antagonistic peptides, as well as studies in PAR2 knockout mice, identified critical functions of PAR2 in development, inflammation, immunity, and angiogenesis. Here, we review these roles of PAR2 with an emphasis on the role of coagulation and other extracellular protease pathways that cleave PAR2 in epithelial, immune, and neuronal cells to regulate physiological and pathophysiological processes.
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References
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Acknowledgements
We thank Cheryl Johnson for the preparation of figures. The authors are supported by grants from the National Heart Lung Blood Institute (HL-60472 and HL-77753 to WR) and the Deutsche Forschungsgemeinschaft (RO 3795/2-1 to ASR).
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This article is published as part of the special issue on Coagulation & Inflammation [34:1].
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Rothmeier, A.S., Ruf, W. Protease-activated receptor 2 signaling in inflammation. Semin Immunopathol 34, 133–149 (2012). https://doi.org/10.1007/s00281-011-0289-1
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DOI: https://doi.org/10.1007/s00281-011-0289-1