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J. Biol. Chem., Vol. 263, Issue 13, 6177-6182, May, 1988
Y Zhang, JX Lin and J Vilcek
Interleukin 6 (IL-6; also referred to as interferon-beta 2, 26-kDa protein,
and B cell stimulatory factor 2) is a cytokine whose actions include a
stimulation of immunoglobulin synthesis, enhancement of B cell growth, and
modulation of acute phase protein synthesis by hepatocytes. Synthesis of
IL-6 is stimulated by interleukin 1 (IL-1), tumor necrosis factor (TNF), or
platelet-derived growth factor. We examined the role of the cyclic AMP
(cAMP)-dependent signal transduction pathway in IL-6 gene expression.
Several activators of adenylate cyclase, including prostaglandin E1,
forskolin, and cholera toxin, as well as the phosphodiesterase inhibitor
isobutylmethylxanthine and the cAMP analog dibutyryl cAMP, shared the
ability to cause a dramatic and sustained increase in IL-6 mRNA levels in
human FS-4 fibroblasts. Actinomycin D treatment abolished this enhancement.
Treatments that increased intracellular cAMP also stimulated the secretion
of the IL-6 protein in a biologically active form. Increased intracellular
cAMP appears to enhance IL-6 gene expression by a protein kinase
C-independent mechanism because down- regulation of protein kinase C by a
chronic exposure of cells to a high dose of 12-O-tetradecanoylphorbol
13-acetate did not abolish the enhancement of IL-6 expression by treatments
that increase cAMP. IL-1 and TNF too increased IL-6 mRNA levels by a
protein kinase C- independent mechanism. Our results suggest a role for the
cAMP- dependent pathway(s) in IL-6 gene activation by TNF and IL-1.
Synthesis of interleukin 6 (interferon-beta 2/B cell stimulatory factor 2) in human fibroblasts is triggered by an increase in intracellular cyclic AMP
Department of Microbiology, New York University Medical Center, New York 10016.
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