Crucial role of SDF-1/CXCR4 interaction in the recruitment of transplanted dermal multipotent cells to sublethally irradiated bone marrow.
Our previous study indicated that dermal multipotent cells (DMCs) could engraft into bone morrow (BM) of rats with sublethal irradiation and promote hematopoietic recovery after being transplanted systemically, but the mechanisms determining the recruitment of DMCs to the irradiation injured BM remain unclear. In the present study, we investigated the role of stromal cellderived factor-1 (SDF-1)/CXCR4 interaction in this process. Male DMCs were isolated and transplanted into female rats systemically, and by employing quantitative real-time TaqMan polymerase chain reaction for the sex-determining region of Y chromosome, it was found that the amount of DMCs in BM of rats with sublethal irradiation was about 3 times more than that of normal rats (P < 0.01). Incubation of DMCs with AMD3100 before transplantation, which specifically blocks binding of SDF-1 to its endogenous receptor CXCR4, diminished recruitment of DMCs to the injured BM by 57.2 +/- 5.5% (P < 0.05). In addition, it was confirmed that the expression of SDF-1 in injured BM was up-regulated when compared with that in normal BM, and in vitro analysis revealed that BM extracts from irradiated rats had a strong chemotactic effect on DMCs, which decreased significantly when DMCs were pre-incubated with AMD3100 (P < 0.05). These data suggest that transplanted DMCs were recruited more frequently to irradiation-injured BM than normal BM and the interactions of SDF-1/CXCR4 played an important role in this process.
Zong
Zhao-Wen
ZW
Institute of Combined Injury, School of Military Preventive Medicine, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University.
Cheng
Tian-Min
TM
Su
Yong-Ping
YP
Ran
Xin-Ze
XZ
Li
Nan
N
Ai
Guo-Ping
GP
Xu
Hui
H
D000818:Animals; D001853:Bone Marrow / Q000378:metabolism* / Q000473:pathology / Q000528:radiation effects* / Q000601:surgery; D002478:Cells, Cultured; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000378:metabolism*; D005260:Female; D039902:Multipotent Stem Cells / Q000378:metabolism* / Q000637:transplantation*; D051381:Rats; D017208:Rats, Wistar; D019718:Receptors, CXCR4 / Q000378:metabolism*; D016038:Skin Transplantation
D054377:Chemokine CXCL12; D019743:Chemokines, CXC; C486264:Cxcr4 protein, rat; D019718:Receptors, CXCR4