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Upregulation of TLR2 expression on G-CSF-mobilized peripheral blood stem cells is responsible for their rapid engraftment after allogeneic hematopoietic stem cell transplantation.

Abstract：

:Granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood stem cells (PBSCs) are more frequently used as the cellular source in allogeneic hematopoietic stem cell transplantation (HSCT) than bone marrow stem cells (BMSCs) because they promote more rapid engraftment and immune reconstitution. However, the underlying mechanism for this is not fully understood. Here, we investigated the role of Toll-like receptor 2 (TLR2) on PBSCs in promoting rapid engraftment after allogeneic HSCT. We found that PBSCs highly expressed TLR2 in comparison to BMSCs, and TLR2 was directly induced by G-CSF signaling. Treatment with the TLR2 ligand, Pam(3)CSK(4) (PAM), more efficiently induced myeloid differentiation of PBSCs than BMSCs. Similarly, endogenous TLR2 ligands from the serum of recipients of allogeneic transplantation more rapidly stimulated myeloid differentiation of PBSCs compared with BMSCs. PAM treatment of TLR2(-/-) syngeneic recipient mice transplanted with PBSCs resulted in significantly elevated numbers of PBSC-derived myeloid cells and spleen colony formation compared with controls. Our results demonstrate that TLR2 signaling in PBSCs correlates with their ability to rapidly differentiate into myeloid cells, resulting in improved engraftment. Thus, TLR2 may be a novel target for increasing the efficiency of allogeneic HSCT by overcoming engraftment failure or delayed engraftment.

journal_name

Cytokine

journal_title

Cytokine

authors

Joo YD,Lee WS,Won HJ,Lee SM,Choi JH,Lee SM,Han KH,Park SG,Choi IW,Seo SK

doi

10.1016/j.cyto.2010.12.020

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

36-42

issue

1

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(10)00803-3

journal_volume

54

pub_type

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