title: Enhanced c-Met activity promotes G-CSF-induced mobilization of hematopoietic progenitor cells via ROS signaling.
abstract: Mechanisms governing stress-induced hematopoietic progenitor cell mobilization are not fully deciphered. We report that during granulocyte colony-stimulating factor-induced mobilization c-Met expression and signaling are up-regulated on immature bone marrow progenitors. Interestingly, stromal cell-derived factor 1/CXC chemokine receptor-4 signaling induced hepatocyte growth factor production and c-Met activation. We found that c-Met inhibition reduced mobilization of both immature progenitors and the more primitive Sca-1(+)/c-Kit(+)/Lin(-) cells and interfered with their enhanced chemotactic migration to stromal cell-derived factor 1. c-Met activation resulted in cellular accumulation of reactive oxygen species by mammalian target of rapamycin inhibition of Forkhead Box, subclass O3a. Blockage of mammalian target of rapamycin inhibition or reactive oxygen species signaling impaired c-Met-mediated mobilization. Our data show dynamic c-Met expression and function in the bone marrow and show that enhanced c-Met signaling is crucial to facilitate stress-induced mobilization of progenitor cells as part of host defense and repair mechanisms.
authors.affiliation: Department of Immunology, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: Melania
authors.initials: M
authors.lastname: Tesio
authors.forename: Karin
authors.initials: K
authors.lastname: Golan
authors.forename: Simona
authors.initials: S
authors.lastname: Corso
authors.forename: Silvia
authors.initials: S
authors.lastname: Giordano
authors.forename: Amir
authors.initials: A
authors.lastname: Schajnovitz
authors.forename: Yaron
authors.initials: Y
authors.lastname: Vagima
authors.forename: Shoham
authors.initials: S
authors.lastname: Shivtiel
authors.forename: Alexander
authors.initials: A
authors.lastname: Kalinkovich
authors.forename: Luisa
authors.initials: L
authors.lastname: Caione
authors.forename: Loretta
authors.initials: L
authors.lastname: Gammaitoni
authors.forename: Elisa
authors.initials: E
authors.lastname: Laurenti
authors.forename: Eike C
authors.initials: EC
authors.lastname: Buss
authors.forename: Elias
authors.initials: E
authors.lastname: Shezen
authors.forename: Tomer
authors.initials: T
authors.lastname: Itkin
authors.forename: Orit
authors.initials: O
authors.lastname: Kollet
authors.forename: Isabelle
authors.initials: I
authors.lastname: Petit
authors.forename: Andreas
authors.initials: A
authors.lastname: Trumpp
authors.forename: James
authors.initials: J
authors.lastname: Christensen
authors.forename: Massimo
authors.initials: M
authors.lastname: Aglietta
authors.forename: Wanda
authors.initials: W
authors.lastname: Piacibello
authors.forename: Tsvee
authors.initials: T
authors.lastname: Lapidot
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000502:physiology*; D054377:Chemokine CXCL12 / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D016179:Granulocyte Colony-Stimulating Factor / Q000378:metabolism*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000378:metabolism*; D017228:Hepatocyte Growth Factor / Q000378:metabolism; D047468:Immunoprecipitation; D051379:Mice; D008810:Mice, Inbred C57BL; D019859:Proto-Oncogene Proteins c-met / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D054377:Chemokine CXCL12; C515256:Cxcl12 protein, mouse; D017382:Reactive Oxygen Species; D016179:Granulocyte Colony-Stimulating Factor; D017228:Hepatocyte Growth Factor; D019859:Proto-Oncogene Proteins c-met