Author(s): Cao XM, Guy GR, Sukhatme VP, Tan YH
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Abstract Treatment of quiescent primary human fibroblasts with tumor necrosis factor (TNF) alpha, TNF-beta, interleukin-1, interferon (IFN) alpha, IFN beta, or IFN gamma induced Egr-1 mRNA. In primary human fibroblasts TNF-alpha and TNF-beta were mildly mitogenic and IFN alpha and IFN gamma were growth inhibitory. However, in HeLa cells TNF but not IFN induced the expression of Egr-1 mRNA, while both cytokines inhibited HeLa cell division. Kinetic measurements of Egr-1 gene expression showed that TNF-alpha, TNF-beta, and IFN gamma increased the cellular concentration of Egr-1 mRNA within 30 min. A maximum induction of Egr-1 mRNA was detected at approximately 60 min which dropped to basal level by 180 min. Induction was inhibited by H7 and staurosporine but not by HA1004, indicating the involvement of a functional protein kinase C. The Egr-1 message was translated and the cellular Egr-1 protein detected within 60 min of cytokine treatment. Despite similar Egr-1 mRNA induction, the amount of Egr-1 protein translated in IFN alpha- and IFN gamma-treated cells was lower than in those treated with TNF-alpha and TNF-beta, and highest in the EGF-treated primary human fibroblasts. Indeed, the level of Egr-1 protein translated in these cells correlated proportionally with both the phosphorylation of cap-binding protein (eukaryotic initiation factor) and the amount of cellular DNA synthesis in the variously treated fibroblasts. These results suggest that both growth stimulatory and inhibitory cytokines can regulate Egr-1 gene expression at the transcriptional and translational level. However, the combination of these regulatory controls may determine the cellular concentration of the Egr-1 gene product and hence, its effect on cell proliferation.
This article was published in J Biol Chem
and referenced in Journal of Cancer Science & Therapy