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KMID : 0620920100420020122
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Experimental & Molecular Medicine
2010 Volume.42 No. 2 p.122 ~ p.131
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Intramarrow injection of β-catenin-activated, but not naive mesenchymal stromal cells stimulates self-renewal of hematopoietic stem cells in bone marrow
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Ahn Ji-Yeon
Park Gyeong-Sin
Shim Jae-Seung
Oh Il-Hoan
Lee Jong-Wook
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Abstract
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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 β-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/β-catenin signals may be a strategy to activate such a stem cell niche for efficient regeneration of bone marrow HSCs.
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KEYWORD
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bone marrow, bone marrow transplantation, hematopoietic stem cells, stem cell niche, stromal cells
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