alexa The long-term repopulating subset of hematopoietic stem cells is deterministic and isolatable by phenotype.
Oncology

Oncology

Journal of Cancer Science & Therapy

Author(s): Morrison SJ, Weissman IL

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Abstract The Thy-1.1loSca-1hiLin-/lo population, representing 0.05\% of C57BL/Ka-Thy-1.1 bone marrow, is highly enriched for hematopoietic stem cells and includes all multipotent progenitors in this mouse strain; however, the functional reconstituting activity of this fraction is heterogeneous. Only around 25\% of clonal reconstitutions by cells from this population are long term; remaining clones yield transient multilineage reconstitutions. By fractionating based on lineage marker expression, the Thy-1.1loSca-1hiLin-/lo population has been resolved into three subpopulations: Lin-Mac-1-CD4-; Lin-Mac-1loCD4-; and Mac-1loCD4lo. Of these, only the Lin-Mac-1-CD4- population is highly enriched for long-term reconstituting hematopoietic stem cells. A comparison of transient and long-term multipotent progenitors indicates that long-term progenitors have less CFU-S activity, are equally radioprotective, and are less frequently in cell cycle. The ability to predict the longevity of reconstitution based on lineage marker expression indicates that reconstitution potential is deterministic, not stochastic.
This article was published in Immunity and referenced in Journal of Cancer Science & Therapy

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