title: Phorbol ester induces interleukin-2 receptor on the cell surface of precursor thymocyte leukemia with no rearrangement of T cell receptor beta and gamma genes.
abstract: The early event of thymocyte maturation has been analyzed using acute lymphoblastic leukemia (ALL) cells. A group of ALL cells whose cell surface phenotype was CD2 (SRBC receptor) negative and CD7 (T cell antigen) positive has been considered as precursor thymocyte ALL (pre-T-ALL). No rearrangements of the T cell receptor beta-gene (TCR beta) and gamma-gene (TCR gamma) were found in three of four pre-T-ALL patients. Stimulation of these pre-T-ALL cells with 12-0-tetradecanoylphorbol-13-acetate (TPA) induced only CD25 (Tac) antigen but no other T cell antigens. These findings suggest that the activation pathway of interleukin 2 (IL-2) receptor already exists in the most immature precursor thymocytes. Pre-T-ALL cells from the fourth patients showed the expression of CD3 antigen, and both TCR beta and TCR gamma rearrangement. TPA induced the differentiation of the more mature pre-T-ALL cells of this case in vitro, and not only CD25 (Tac) antigen but also CD4 and CD8 antigens appeared on the cell surface. The low affinity binding of 125I-IL-2 to TPA-stimulated leukemia cells was observed in the three cases of pre-T-ALL tested, and the addition of recombinant IL-2 to TPA-stimulated cells showed no effect on cell proliferation.
authors.affiliation: First Department of Internal Medicine, Nagoya University School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Morishima
authors.forename: Y
authors.initials: Y
authors.lastname: Morishita
authors.forename: K
authors.initials: K
authors.lastname: Adachi
authors.forename: M
authors.initials: M
authors.lastname: Tanimoto
authors.forename: R
authors.initials: R
authors.lastname: Ohno
authors.forename: H
authors.initials: H
authors.lastname: Saito
mesh_terms: D000911:Antibodies, Monoclonal; D002455:Cell Division; D002462:Cell Membrane / Q000276:immunology; D002478:Cells, Cultured; D002648:Child; D004262:DNA Restriction Enzymes; D005796:Genes / Q000187:drug effects*; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D054218:Precursor T-Cell Lymphoblastic Leukemia-Lymphoma / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D011971:Receptors, Immunologic / Q000096:biosynthesis / Q000235:genetics*; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D013945:Thymoma / Q000276:immunology*; D013953:Thymus Neoplasms / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D004262:DNA Restriction Enzymes; D013755:Tetradecanoylphorbol Acetate