title: [Cellular and biological characterization of CD7-positive acute leukemia cells--an investigation of the established cell line, HSM911].
abstract: A novel human CD7-positive leukemia cell line (HSM911) derived from the peripheral blood of a patient with acute myelogenous leukemia (AML) was studied for its cellular and biological characterization. Proliferation assay using a variety of cytokines demonstrated that the HSM911 cells proliferate in response to recombinant granulocyte-macrophage-colony stimulating factor (rGM-CSF), recombinant Interleukin-3 (rIL-3) and recombinant stem cell factor (rSCF), but do not in response to recombinant granulocyte-colony stimulating factor (rG-CSF), natural macrophage-colony stimulating factor (M-CSF), rIL-1, rIL-2, rIL-4, rIL-5, rIL-6 or recombinant erythropoietin (rEpo). Polyclonal anti-GM-CSF antibody and polyclonal anti-IL-3 antibody blocked the proliferation of HSM911 stimulated with rGM-CSF and rIL-3, respectively. HSM911 maintained in the presence of rGM-CSF expressed the CD7, CD13, CD33, CD34, CD41a, HLA-DR, VLA1-VLA5, CD11a, CD54, CD44 and LAM1. These findings suggest that HSM911 might be of multipotent progenitor cell origin. GM-CSF receptors and rIL-3 receptors expressed on this cell line were simultaneously suppressed by rGM-CSF or rIL-3, whereas only IL-3 receptors were down-modulated by rSCF. Treatment with 12-o-tetradecanoyl-phorbol-13-acetate (TPA) induced the differentiation of HSM911 cells into macrophage-like cells but not erythroblasts, megakaryocytes or lymphocytes. Interferon-gamma and transforming growth factor-beta (TGF-beta) suppressed the proliferation of HSM911 cells in a dose dependent manner. HSM911 was relatively resistant against anti-cancer drugs compared with fresh AML cells and other leukemic cell line. HSM911 is a useful tool for analyzing CD7-positive acute myelogenous leukemia.
authors.affiliation: Third Department of Internal Medicine, Hokkaido University School of Medicine, Sapporo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Iwasaki
mesh_terms: D000368:Aged; D015703:Antigens, CD / Q000276:immunology; D019011:Antigens, CD7; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D000970:Antineoplastic Agents / Q000494:pharmacology; D002454:Cell Differentiation; D002455:Cell Division; D016207:Cytokines / Q000494:pharmacology*; D005260:Female; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000276:immunology / Q000473:pathology*; D014407:Tumor Cells, Cultured
chemical_list: D015703:Antigens, CD; D019011:Antigens, CD7; D000945:Antigens, Differentiation, T-Lymphocyte; D000970:Antineoplastic Agents; D016207:Cytokines