| First Author | Foudi A | Year | 2006 |
| Journal | Blood | Volume | 107 |
| Issue | 6 | Pages | 2243-51 |
| PubMed ID | 16291599 | Mgi Jnum | J:129372 |
| Mgi Id | MGI:3769177 | Doi | 10.1182/blood-2005-02-0581 |
| Citation | Foudi A, et al. (2006) Reduced retention of radioprotective hematopoietic cells within the bone marrow microenvironment in CXCR4-/- chimeric mice. Blood 107(6):2243-51 |
| abstractText | The physiologic role of CXCR4 on hematopoietic stem/progenitor cells (HSPCs) is not fully understood. Here, we show that radioprotection of lethally irradiated mice by embryonic day 14.5 (E14.5) CXCR4-/- fetal liver (FL) cells was markedly impaired when compared with CXCR4+/+ counterparts, but this defect was rescued when hosts were engrafted with high cell numbers. This quantitative defect contrasted with a similar content in hematopoietic colony-forming cells (CFCs), splenic colony-forming units (CFUs-S), and Lin- Sca-1+ c-kit+ cells in E14.5 CXCR4-/- and CXCR4+/+ livers. In addition, the homing of HSPCs in the bone marrow was not altered as detected with a CFSE-staining assay. In contrast, a 30-fold increase in CFCs was seen in the circulation of mice stably reconstituted with CXCR4-/- FL cells and this increment was already observed before hematopoiesis had reached a steady-state level. Together, the data strongly suggest that impaired retention may, at least in short-term hematopoietic reconstitution, lead to a diminution in the number of available progenitors required for radioprotection. |
