title: Differential secretion of tumor necrosis factor-alpha and granulocyte/macrophage colony-stimulating factors but not interferon-gamma from CD4+ compared to CD8+ human T cell clones.
abstract: Tumor necrosis factor-alpha (TNF-alpha) is a pleiotropic lymphokine which may have important regulatory effects on immune responses. It is shown here that eight alloreactive CD4+ T cell clones (TCC) secreted significant amounts of TNF-alpha after stimulation with either specific alloantigen or 12-O-tetradecanoylphorbol 13-acetate together with the calcium ionophore ionomycin (up to 50 ng/ml/24 h/10(6) cells) whereas CD8+ TCC failed to do so (max. 2 ng/ml/24 h/10(6) cells). The CD8+ TCC also secreted markedly less granulocyte/macrophage colony-stimulating factor than the CD4+ cells. However, this was not indicative of a general decrease of lymphokine production by CD8+ cells because CD4+ and CD8+ TCC both secreted similar amounts of interferon-gamma. These results show that regulatory CD4+ lymphocytes can produce large amounts of TNF-alpha, whereas CD8+ effector cells cannot do so.
authors.affiliation: Immunology Laboratory, Medizinische Klinik, Tübingen, FRG.
authors.forename: G
authors.initials: G
authors.lastname: Pawelec
authors.forename: K
authors.initials: K
authors.lastname: Schaudt
authors.forename: A
authors.initials: A
authors.lastname: Rehbein
authors.forename: F W
authors.initials: FW
authors.lastname: Busch
mesh_terms: D002999:Clone Cells / Q000145:classification / Q000276:immunology / Q000378:metabolism; D003115:Colony-Stimulating Factors / Q000378:metabolism*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006133:Growth Substances / Q000378:metabolism*; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D008213:Lymphocyte Activation; D010641:Phenotype; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000145:classification / Q000276:immunology / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor