title: Cloning, expression, and characterization of a cDNA encoding a novel human growth factor for primitive hematopoietic progenitor cells.
abstract: Multiple growth factors synergistically stimulate proliferation of primitive hematopoietic progenitor cells. A human myeloid cell line, KPB-M15, constitutively produces a novel hematopoietic cytokine, termed stem cell growth factor (SCGF), possessing species-specific proliferative activities. Here we report the molecular cloning, expression, and characterization of a cDNA encoding human SCGF using a newly developed lambdaSHDM vector that is more efficient for differential and expression cloning. cDNA for SCGF encodes a 29-kDa polypeptide without N-linked glycosylation. SCGF transiently produced by COS-1 cells supports growth of hematopoietic progenitor cells through a short-term liquid culture of bone marrow cells and exhibits promoting activities on erythroid and granulocyte/macrophage progenitor cells in primary semisolid culture with erythropoietin and granulocyte/macrophage colony-stimulating factor, respectively. Expression of SCGF mRNA is restricted to myeloid cells and fibroblasts, suggesting that SCGF is a growth factor functioning within the hematopoietic microenvironment. SCGF could disclose some human-specific mechanisms as yet unidentified from studies on the murine hematopoietic system.
authors.affiliation: Department of Internal Medicine, Osaka Dental University, 1-5-17 Ohtemae, Chuo-ku, Osaka 540, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hiraoka
authors.forename: A
authors.initials: A
authors.lastname: Sugimura
authors.forename: T
authors.initials: T
authors.lastname: Seki
authors.forename: T
authors.initials: T
authors.lastname: Nagasawa
authors.forename: N
authors.initials: N
authors.lastname: Ohta
authors.forename: M
authors.initials: M
authors.lastname: Shimonishi
authors.forename: M
authors.initials: M
authors.lastname: Hagiya
authors.forename: S
authors.initials: S
authors.lastname: Shimizu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D002455:Cell Division / Q000187:drug effects; D003001:Cloning, Molecular; D016298:Hematopoietic Cell Growth Factors / Q000235:genetics* / Q000378:metabolism / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D008969:Molecular Sequence Data
chemical_list: D016298:Hematopoietic Cell Growth Factors