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Functionally distinct hematopoietic stem cells modulate hematopoietic lineage potential during aging by a mechanism of clonal expansion
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Functionally distinct hematopoietic stem cells modulate hematopoietic lineage potential during aging by a mechanism of clonal expansion
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Journal Article
Functionally distinct hematopoietic stem cells modulate hematopoietic lineage potential during aging by a mechanism of clonal expansion
2010
Overview
Aging of the hematopoietic stem cell compartment is believed to contribute to the onset of a variety of age-dependent blood cell pathophysiologies. Mechanistic drivers of hematopoietic stem cell (HSC) aging include DNA damage accumulation and induction of tumor suppressor pathways that combine to reduce the regenerative capacity of aged HSCs. Such mechanisms do not however account for the change in lymphoid and myeloid lineage potential characteristic of HSC aging, which is believed to be central to the decline of immune competence and predisposition to myelogenous diseases in the elderly. Here we have prospectively isolated functionally distinct HSC clonal subtypes, based on cell surface phenotype, bearing intrinsically different capacities to differentiate toward lymphoid and myeloid effector cells mediated by quantitative differences in lineage priming. Finally, we present data supporting a model in which clonal expansion of a class of intrinsically myeloid-biased HSCs with robust self-renewal potential is a central component of hematopoietic aging.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Animals
/ Blood
/ Cloning
/ elderly
/ Hematopoietic Stem Cell Transplantation
/ Hematopoietic Stem Cells - classification
/ Hematopoietic Stem Cells - cytology
/ Hematopoietic Stem Cells - immunology
/ Hematopoietic Stem Cells - metabolism
/ HSCs
/ Immunologi inom det medicinska området (Här ingår: Cell- och immunterapi)
/ Immunology in the Medical Area (including Cell and Immunotherapy)
/ leukemia
/ MEDICIN
/ MEDICINE
/ Medicinska och farmaceutiska grundvetenskaper
/ Mice
/ Receptors, Cell Surface - metabolism
