Intramarrow injection of beta-catenin-activated, but not naive mesenchymal stromal cells stimulates self-renewal of hematopoietic stem cells in bone marrow
Experimental & Molecular Medicine
;
: 122-131, 2010.
Article
in English
| WPRIM
| ID: wpr-81942
ABSTRACT
Bone marrow mesenchymal stromal cells (MSCs) have been implicated in the microenvironmental support of hematopoietic stem cells (HSCs) and often co-transplanted with HSCs to facilitate recovery of ablated bone marrows. However, the precise effect of transplanted MSCs on HSC regeneration remains unclear because the kinetics of HSC self-renewal in vivo after co-transplantation has not been monitored. In this study, we examined the effects of intrafemoral injection of MSCs on HSC self-renewal in rigorous competitive repopulating unit (CRU) assays using congenic transplantation models in which stromal progenitors (CFU-F) were ablated by irradiation. Interestingly, naive MSCs injected into femur contributed to the reconstitution of a stromal niche in the ablated bone marrows, but did not exert a stimulatory effect on the in-vivo self-renewal of co-transplanted HSCs regardless of the transplantation methods. In contrast, HSC self-renewal was four-fold higher in bone marrows intrafemorally injected with beta-catenin-activated MSCs. These results reveal that naive MSCs lack a stimulatory effect on HSC self-renewal in-vivo and that stroma must be activated during recoveries of bone marrows. Stromal targeting of wnt/beta-catenin signals may be a strategy to activate such a stem cell niche for efficient regeneration of bone marrow HSCs.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Radiation Chimera
/
Regeneration
/
Bone Marrow
/
Hematopoietic Stem Cells
/
Stromal Cells
/
Hematopoietic Stem Cell Transplantation
/
Transplantation Conditioning
/
Hematopoietic Stem Cell Mobilization
/
Mesenchymal Stem Cell Transplantation
/
Beta Catenin
Limits:
Animals
Language:
English
Journal:
Experimental & Molecular Medicine
Year:
2010
Type:
Article
Similar
MEDLINE
...
LILACS
LIS