title: Long-term contribution to the myeloid compartment by lineage-committed stem cells.
abstract: The current paradigm concerning the kinetics of hematopoiesis is that only the most primitive pluripotential bone marrow stem cells can support prolonged hematopoiesis whereas more differentiated, lineage-committed stem cells can only contribute to a particular lineage for a limited period of time. In this study, we present evidence that in mice, the spleen contains a long-lived myeloid-committed stem cell population(s) that continuously replenishes the mature myeloid lineage for at least 9 months. After myeloid-specific retroviral-mediated gene transfer, the exogenous gene could be detected in thioglycollate-induced macrophages and granulocytes by Southern blot analysis and by in situ polymerase chain reaction on an individual cell basis. The targeted stem cell population does not repopulate the bone marrow in secondary recipients and did not give rise to cells other than cells of the myeloid lineage. It therefore represents the first nonpluripotential stem cell population capable of replenishing a hemopoietic lineage for a long period of time. The ability to target a myeloid-specific stem cell could facilitate gene therapy of congenital disorders of the myeloid system such as lysosomal storage diseases. It also offers a unique opportunity to assess the immunologic consequences of expressing an exogenous gene of choice exclusively in the myeloid lineage.
authors.affiliation: Department of Molecular Genetics and Microbiology, University of Medicine and Dentistry of New Jersey, USA. Genetics, Rutgers University, Piscataway, NJ, USA.
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Rivera
authors.forename: N
authors.initials: N
authors.lastname: Ron
authors.forename: N
authors.initials: N
authors.lastname: Sutkowski
authors.forename: J P
authors.initials: JP
authors.lastname: Dougherty
authors.forename: Y
authors.initials: Y
authors.lastname: Ron
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000637:transplantation*; D001854:Bone Marrow Cells / Q000166:cytology*; D019070:Cell Lineage; D005260:Female; D017930:Genes, Reporter; D005822:Genetic Vectors / Q000235:genetics; D006410:Hematopoiesis; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects; D017403:In Situ Hybridization; D019868:Kanamycin Kinase / Q000032:analysis; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D017737:Macrophages, Peritoneal / Q000737:chemistry; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008979:Moloney murine leukemia virus / Q000235:genetics; D016133:Polymerase Chain Reaction; D011828:Radiation Chimera; D011993:Recombinant Fusion Proteins / Q000032:analysis; D013154:Spleen / Q000166:cytology*; D014162:Transfection
chemical_list: D008070:Lipopolysaccharides; D011993:Recombinant Fusion Proteins; D019868:Kanamycin Kinase