Modulation of the constitutive gene expression of the 55 kD tumor necrosis factor receptor in hematopoietic cells.
The expression of the 55 kD human tumor necrosis factor (TNF) receptor gene was investigated. By use of a 1.2 kb cDNA we demonstrated a constitutive expression of a single 2.3 kb transcript in cell lines and fresh blood cells. The TNF receptor gene expression was not affected by phorbol esters, dibutyryl cAMP (dbcAMP), interleukin-1 (IL-1), interferon-gamma (IFN-gamma) or by TNF, agents known to modulate functional TNF receptors. The phosphodiesterase inhibitor 3-isobutyl-1-methyl-xanthine (IBMX) showed a dose dependent inhibition of the TNF receptor gene expression. This inhibition is not mediated by cAMP, since neither dbcAMP nor forskolin had any effects on the expression of the 55 kD receptor gene. The results suggest that the effects of phorbol diesters, IL-1, IFN-gamma, TNF and dbcAMP previously observed on binding of TNF to cells are limited to posttranscriptional regulation of the 55 kD TNF receptor.
Department of Medicine, Lund hospital, Sweden.
L
L
Lindvall
M
M
Lantz
U
U
Gullberg
I
I
Olsson
D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D003994:Bucladesine / Q000494:pharmacology; D006528:Carcinoma, Hepatocellular; D005576:Colforsin / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D015473:Leukemia, Promyelocytic, Acute; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism*; D008113:Liver Neoplasms; D008970:Molecular Weight; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism*; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma; D012313:RNA / Q000097:blood / Q000235:genetics / Q000302:isolation & purification; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification; D011956:Receptors, Cell Surface / Q000235:genetics*; D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins / Q000378:metabolism; D012016:Reference Values; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014158:Transcription, Genetic / Q000187:drug effects*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D012334:RNA, Neoplasm; D011956:Receptors, Cell Surface; D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D005576:Colforsin; D012313:RNA; D003994:Bucladesine; D013755:Tetradecanoylphorbol Acetate; D015056:1-Methyl-3-isobutylxanthine