title: Molecular signatures of quiescent, mobilized and leukemia-initiating hematopoietic stem cells.
abstract: Hematopoietic stem cells (HSC) are rare, multipotent cells capable of generating all specialized cells of the blood system. Appropriate regulation of HSC quiescence is thought to be crucial to maintain their lifelong function; however, the molecular pathways controlling stem cell quiescence remain poorly characterized. Likewise, the molecular events driving leukemogenesis remain elusive. In this study, we compare the gene expression profiles of steady-state bone marrow HSC to non-self-renewing multipotent progenitors; to HSC treated with mobilizing drugs that expand the HSC pool and induce egress from the marrow; and to leukemic HSC in a mouse model of chronic myelogenous leukemia. By intersecting the resulting lists of differentially regulated genes we identify a subset of molecules that are downregulated in all three circumstances, and thus may be particularly important for the maintenance and function of normal, quiescent HSC. These results identify potential key regulators of HSC and give insights into the clinically important processes of HSC mobilization for transplantation and leukemic development from cancer stem cells.
authors.affiliation: Institute for Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, California, United States of America. cforsber@ucsc.edu
authors.forename: E Camilla
authors.initials: EC
authors.lastname: Forsberg
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Passegué
authors.forename: Susan S
authors.initials: SS
authors.lastname: Prohaska
authors.forename: Amy J
authors.initials: AJ
authors.lastname: Wagers
authors.forename: Martina
authors.initials: M
authors.lastname: Koeva
authors.forename: Joshua M
authors.initials: JM
authors.lastname: Stuart
authors.forename: Irving L
authors.initials: IL
authors.lastname: Weissman
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic; D004195:Disease Models, Animal; D005434:Flow Cytometry; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000378:metabolism*; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D009693:Nucleic Acid Hybridization; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic