Abstract
Missing in metastasis (MIM) is abundantly expressed in hematopoietic cells. Here we characterized the impact of MIM deficiency on murine bone marrow (BM) cells. Although MIM-/-cells proliferated similarly to wild type (WT), they exhibited stronger response to chemokine stromal-derived factor 1 (SDF-1), increase in surface expression of CXCR4, impaired CXCR4 internalization and constitutive activation of Rac, Cdc42 and p38. Transplantation of MIM-/-BM cells into lethally irradiated mice showed enhanced homing to BM, which was abolished when mice were pretreated with a p38 antagonist. Interestingly, MIM-/-BM cells, including hematopoietic stem and progenitor cells (HSPCs), showed two-to fivefold increase in mobilization into the peripheral blood upon treatment with AMD3100. In vitro, MIM-/-leukocytes were susceptible to AMD3100 and maintained increased response to AMD3100 for mobilization even after transfer into WT mice. MIM-/-mice had also a higher level of SDF-1 in the circulation. Our data highlighted an unprecedented role of MIM in the homeostasis of BM cells, including HSPCs, through modulation of the CXCR4/SDF-1 axis and interactions of BM leukocytes with their microenvironments .
Original language | English (US) |
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Pages (from-to) | 1327-1334 |
Number of pages | 8 |
Journal | Leukemia |
Volume | 30 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1 2016 |
Externally published | Yes |
ASJC Scopus subject areas
- Hematology
- Cancer Research
- Anesthesiology and Pain Medicine