Semin Thromb Hemost 2005; 31(2): 217-233
DOI: 10.1055/s-2005-869527
Copyright © 2005 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel: +1(212) 584-4662.

Ectonucleotidases of CD39 Family Modulate Vascular Inflammation and Thrombosis in Transplantation

Simon C. Robson1 , 2 , Yan Wu2 , Xiaofeng Sun2 , Christoph Knosalla3 , Karen Dwyer2 , Keiichi Enjyoji2
  • 1Associate Professor, Vascular Biology and Transplantation Centers, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
  • 2Vascular Biology and Transplantation Centers, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
  • 3Transplantation Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
Further Information

Publication History

Publication Date:
26 April 2005 (online)

ABSTRACT

Transplantation results in exposure of the graft vasculature to warm and cold ischemia, followed by perfusion by circulating blood constituents and obligatory oxidant stress. Further graft injury occurs as consequences of acute humoral cellular rejection or chronic transplant vasculopathy, or both. Extracellular nucleotide stimulation of purinergic type 2 (P2) receptors are key components of platelet, endothelial cell (EC), and leukocyte activation resulting in vascular thrombosis and inflammation in vivo. CD39, the prototype nucleoside triphosphate diphosphohydrolase (NTPDase-1) is highly expressed on endothelium; in contrast, CD39L1/NTPDase-2 (a preferential adenosine triphosphatase [ATPase]) is found on vascular adventitial cells. Both ectoenzymes influence thrombogenesis by the regulated hydrolysis of extracellular nucleotides that differentially regulate P2-receptor activity and function in platelets and vascular cells. The intracytoplasmic domains of NTPDase-1 may also independently influence cellular activation and proliferation. NTPDase activity is substantively lost in the vasculature of injured or rejected grafts. A role for NTPDase-1 in thromboregulation has been validated by generation of mutant mice either null for cd39 or overexpressing human CD39. Administration of soluble NTPDase or induction of CD39 by adenoviral vectors, or both, are also of benefit in several models of transplantation. Administration of soluble CD39 or targeted expression may have future therapeutic application in transplantation-associated and other vascular diseases.

REFERENCES

S. C RobsonM.D. Ph.D. 

Transplantation Center, Research North 99 Brookline Avenue

Room 301, Beth Israel Deaconess Medical Center, Boston, MA 02215

Email: srobson@bidmc.harvard.edu

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