title: Molecular regulation of tumor necrosis factor-alpha and lymphotoxin production in T cells. Inhibition by prostaglandin E2.
abstract: The effects of prostaglandin E2 (PGE2) and other eicosanoids were determined on tumor necrosis factor-alpha (TNF-alpha) and lymphotoxin (LT; TNF-beta) production by murine Th1, antigen-specific major histocompatibility complex class II-restricted T cell clones. T cells activated with immobilized anti-CD3 or with soluble concanavalin A (ConA) produced approximately 100-1,000 units/ml TNF-alpha/LT as determined by cytotoxicity against the WEHI-164 murine fibrosarcoma cell line. TNF-alpha/LT biological activity was induced rapidly with significant production evident approximately 4 h after stimulation with either anti-CD3 or ConA. PGE2 inhibited the anti-CD3- and ConA-induced production of TNF-alpha/LT bioactivity in a dose-dependent manner. Incubation with 1 x 10(-9) M PGE2 inhibited production of TNF-alpha/LT biological activity from anti-CD-activated F1.28, or 450A.1 T cell clones by approximately 50%. Incubation with 1 x 10(-7) M PGE2 resulted in 90% inhibition of biological activity. PGE2 also inhibited both TNF-alpha and LT mRNA accumulation by more than 90%. These results suggest that the reduced production of cytotoxic activity in the presence of PGE2 was caused by the inhibition of both TNF-alpha and LT. No inhibition of T cell TNF-alpha or LT production was observed when anti-CD3- or ConA-activated cells were incubated with PGD2, PGF2 alpha, 5-hydroxyeicosatetraenoic acid or leukotriene C4. Nuclear run-on experiments indicated that the PGE2-mediated decrease of TNF-alpha and LT mRNA accumulation was caused, in part, by an inhibitory effect on the transcription of these genes. This is the first report of PGE2-mediated inhibition of TNF-alpha in T cells and PGE2-mediated inhibition of LT production in any cell type.
authors.affiliation: Department of Medicine, Yale University School of Medicine, New Haven, Connecticut 06510.
authors.forename: N R
authors.initials: NR
authors.lastname: Ferreri
authors.forename: T
authors.initials: T
authors.lastname: Sarr
authors.forename: P W
authors.initials: PW
authors.lastname: Askenase
authors.forename: N H
authors.initials: NH
authors.lastname: Ruddle
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D015232:Dinoprostone / Q000494:pharmacology*; D005260:Female; D007700:Kinetics; D008233:Lymphotoxin-alpha / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D011948:Receptors, Antigen, T-Cell; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D008233:Lymphotoxin-alpha; D011948:Receptors, Antigen, T-Cell; D014409:Tumor Necrosis Factor-alpha; D015232:Dinoprostone