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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Transplant 2014 ; 14 (12): 2869-73 Nephropedia Template TP
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Bone Marrow Derived Hematopoietic Stem and Progenitor Cells Infiltrate Allogeneic and Syngeneic Transplants #MMPMID25387427
Fan Z; Enjoji K; Tigges JC; Toxavidis V; Tchipashivili V; Gong W; Strom TB; Koulmanda M
Am J Transplant 2014[Dec]; 14 (12): 2869-73 PMID25387427show ga
Lineage (CD3e, CD11b, GR1, B220 and Ly-76) negative hematopoietic stem cells (HSCs) and hematopoietic progenitor cells (HPCs) infiltrate islet allografts within 24 h posttransplantation. In fact, lineagenegative Sca-1+cKit+ (?LSK?) cells, a classic signature for HSCs, were also detected among these graft infiltrating cells. Lineage negative graft infiltrating cells are functionally multi-potential as determined by a standard competitive bone marrow transplant (BMT) assay. By 3 months post-BMT, both CD45.1 congenic, lineage negative HSCs/HPCs and classic ?LSK? HSCs purified from islet allograft infiltrating cells, differentiate and repopulate multiple mature blood cell phenotypes in peripheral blood, lymph nodes, spleen, bone marrow and thymus of CD45.2 hosts. Interestingly, ?LSK? HSCs also rapidly infiltrate syngeneic islet transplants as well as allogeneic cardiac transplants and sham surgery sites. It seems likely that an inflammatory response, not an adaptive immune response to allo-antigen, is responsible for the rapid infiltration of islet and cardiac transplants by biologically active HSCs/HPCs. The pattern of hematopoietic differentiation obtained from graft infiltrating HSCs/HPCs, cells that are recovered from inflammatory sites, as noted in the competitive BMT assay, is not precisely the same as that of intra-medullary HSCs. This does not refute the obvious multi-lineage potential of graft infiltrating HSCs/HPCs.