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J Biol Chem. 1994 Oct 21;269(42):26486-91.

Identification, cloning, and regulation of a novel endothelial cell protein C/activated protein C receptor.

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Howard Hughes Medical Institute, Oklahoma City, Oklahoma.


Human protein C and activated protein C are shown to bind to endothelium specifically, selectively and saturably (Kd = 30 nM, 7000 sites per cell) in a Ca(2+)-dependent fashion. Expression cloning revealed a 1.3-kilobase pair cDNA that coded for a novel type 1 transmembrane glycoprotein capable of binding protein C. This protein appears to be a member of the CD1/major histocompatibility complex superfamily. Like thrombomodulin, the receptor involved in protein C activation, the endothelial cell protein C receptor function and message are both down-regulated by exposure of endothelium to tumor necrosis factor. Identification of endothelial cell protein C receptor as a member of the CD1/major histocompatibility complex superfamily provides insights into the role of protein C in regulating the inflammatory response.

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