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Related Collections Transplantation Cell Adhesion and Motility Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 15 November 2001, Vol. 98, No. 10, pp. 3143-3149 TRANSPLANTATION Platelet-derived microparticles bind to hematopoietic stem/progenitor cells and enhance their engraftment Anna Janowska-Wieczorek, Marcin Majka, Jacek Kijowski, Monika Baj-Krzyworzeka, Ryan Reca, A. Robert Turner, Janina Ratajczak, Steven G. Emerson, M. Anna Kowalska, and Mariusz Z. Ratajczak From the Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia; Department of Medicine, University of Alberta and Canadian Blood Services, Edmonton, Alberta, Canada; Department of Transplantology CMUJ, Krakow, Poland; and James Graham Brown Cancer Center, University of Louisville, KY. Because human CD34+ and murine Sca-1+ hematopoietic stem-progenitor cells (HSPCs) express platelet-binding sialomucin P-selectin (CD162) and integrin Mac-1 (CD11b-CD18) antigen, it was inferred that these cells might interact with platelets. As a result of this interaction, microparticles derived from platelets (PMPs) may transfer many platelet antigens (CD41, CD61, CD62, CXCR4, PAR-1) to the surfaces of HSPCs. To determine the biologic significance of the presence of PMPs on human CD34+ and murine Sca-1+ cells, their expressions on mobilized peripheral blood (mPB) and on nonmobilized PB- and bone marrow (BM)-derived CD34+ cells were compared. In addition, the effects of PMPs on the proliferation of CD34+ and Sca-1+ cells and on adhesion of HSPCs to endothelium and immobilized SDF-1 were studied. Finally, the hematopoietic reconstitution of lethally irradiated mice receiving transplanted BM mononuclear cells covered or not covered with PMPs was examined. It was found that PMPs are more numerous on mPB than on BM CD34+ cells, do not affect the clonogenicity of human and murine HSPCs, and increase adhesion of these cells to endothelium and immobilized SDF-1. Moreover, murine BM cells covered with PMPs engrafted lethally irradiated mice significantly faster than those not covered, indicating that PMPs play an important role in the homing of HSPCs. This could explain why in a clinical setting human mPB HSPCs (densely covered with PMPs) engraft more rapidly than BM HSPCs (covered with fewer PMPs). These findings indicate a new role for PMPs in stem cell transplantation and may have clinical implications for the optimization of transplantations. © 2001 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: M. Prokopi, G. Pula, U. Mayr, C. Devue, J. Gallagher, Q. Xiao, C. M. Boulanger, N. Westwood, C. Urbich, J. 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