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In clinical bone marrow transplantation, the severe cytopenias induced by bone marrow ablation translate into high risks of developing fatal infections and bleedings, until transplanted hematopoietic stem and progenitor cells have replaced sufficient myeloerythroid offspring. Although adult long-term hematopoietic stem cells (LT-HSCs) are absolutely required and at the single-cell level sufficient for sustained reconstitution of all blood cell lineages, they have been suggested to be less efficient at rapidly reconstituting the hematopoietic system and rescuing myeloablated recipients. Such a function has been proposed to rather be mediated by less well-defined short-term hematopoietic stem cells (ST-HSCs). Herein, we demonstrate that Lin(-)Sca1(+)kit(hi)CD34+ short-term reconstituting cells contain 2 phenotypically and functionally distinct subpopulations: Lin(-)Sca1(+)kit(hi)CD34(+)flt3- cells fulfilling all criteria of ST-HSCs, capable of rapidly reconstituting myelopoiesis, rescuing myeloablated mice, and generating Lin(-)Sca1(+)kit(hi)CD34(+)flt3+ cells, responsible primarily for rapid lymphoid reconstitution. Representing the first commitment steps from Lin(-)Sca1(+)kit(hi) CD34(-)flt3- LT-HSCs, their identification will greatly facilitate delineation of regulatory pathways controlling HSC fate decisions and identification of human ST-HSCs responsible for rapid reconstitution following HSC transplantations.

Original publication

DOI

10.1182/blood-2004-06-2159

Type

Journal article

Journal

Blood

Publication Date

01/04/2005

Volume

105

Pages

2717 - 2723

Keywords

Animals, Antigens, CD34, Antigens, Differentiation, Antigens, Ly, Cell Differentiation, Cell Lineage, Cells, Cultured, Hematopoietic Stem Cell Transplantation, Hematopoietic Stem Cells, Immunomagnetic Separation, Immunophenotyping, Lymphocytes, Mice, Mice, Congenic, Mice, Inbred C57BL, Myeloid Cells, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-kit, Receptor Protein-Tyrosine Kinases, Whole-Body Irradiation, fms-Like Tyrosine Kinase 3