title: Global analysis of proliferation and cell cycle gene expression in the regulation of hematopoietic stem and progenitor cell fates.
abstract: Knowledge of the molecular networks controlling the proliferation and fate of hematopoietic stem cells (HSC) is essential to understand their function in maintaining blood cell production during normal hematopoiesis and upon clinical transplantation. Using highly purified stem and progenitor cell populations, we define the proliferation index and status of the cell cycle machinery at discrete stages of hematopoietic differentiation and during cytokine-mediated HSC mobilization. We identify distinct sets of cell cycle proteins that specifically associate with differentiation, self-renewal, and maintenance of quiescence in HSC and progenitor cells. Moreover, we describe a striking inequality of function among in vivo cycling and quiescent HSC by demonstrating that their long-term engraftment potential resides predominantly in the G(0) fraction. These data provide a direct link between HSC proliferation and function and identify discrete molecular targets in regulating HSC cell fate decisions that could have implications for both the therapeutic use of HSC and the understanding of leukemic transformation.
authors.affiliation: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA. passegue@stanford.edu
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Passegué
authors.forename: Amy J
authors.initials: AJ
authors.lastname: Wagers
authors.forename: Sylvie
authors.initials: S
authors.lastname: Giuriato
authors.forename: Wade C
authors.initials: WC
authors.lastname: Anderson
authors.forename: Irving L
authors.initials: IL
authors.lastname: Weissman
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D002469:Cell Separation; D002471:Cell Transformation, Neoplastic / Q000378:metabolism / Q000473:pathology; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000502:physiology*; D006085:Graft Survival / Q000502:physiology; D006410:Hematopoiesis / Q000502:physiology*; D019650:Hematopoietic Stem Cell Mobilization; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000502:physiology*; D006801:Humans; D007938:Leukemia / Q000378:metabolism / Q000473:pathology / Q000628:therapy; D051379:Mice; D016192:Resting Phase, Cell Cycle / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction