Cloning and regulation of an endothelial cell protein...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/12 (2006.01) A61K 31/70 (2006.01) A61K 38/17 (2006.01) A61K 39/395 (2006.01) C07H 21/00 (2006.01) C07K 14/705 (2006.01) C07K 14/74 (2006.01) C07K 16/28 (2006.01) C12Q 1/68 (2006.01) G01N 33/566 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2199821

Human protein C and activated protein C were shown to bind to endothelium specifically, selectively and saturably (Kd=30 nM, 7000 sites per cell) in a Ca2+, dependent fashion. Expression cloning revealed a 1.3 kb CDNA that coded for a novel type I transmembrane glycoprotein capable of binding protein C. This protein appears to be a member of the CD1/MHC superfamily. Like thrombomodulin, the receptor involved in protein C activation, the endothelial cell protein C receptor (EPCR) function and message are both down regulated by exposure of endothelium to TNF. Identification of EPCR as a member of the CD1/MHC superfamily provides insights into the role of protein C in regulating the inflammatory response, and determination of methods for pharmaceutical use in manipulating the inflammatory response.

On a démontré que la protéine C de l'homme et la protéine C activée réalisaient une liaison spécifique, sélective, stable et saturée (Kd=30 nM, 7000 sites par cellule) avec l'endothélium de façon dépendante de Ca?2+¿. Le clonage d'expression a révélé un ADNc de 1,3 kb codant pour une nouvelle glycoprotéine transmembranaire de type I capable de fixer la protéine C. Cette protéine semble être un membre de la superfamille CD1/MHC. Comme la thrombomoduline, récepteur impliqué dans l'activation de la protéine C, la fonction et le message du récepteur de la protéine C (EPCR) de la cellule endothéliale sont rétro-régulés par l'exposition de l'endothélium à TNF. L'identification d'EPCR en tant que membre de la superfamille CD1/MHC permet d'apporter des explications sur le rôle de la protéine C dans la régulation de la réaction inflammatoire, et de déterminer des procédés à usage pharmaceutique servant à manipuler la réaction inflammatoire.

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