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J. Biol. Chem., Vol. 262, Issue 25, 11908-11911, Sep, 1987
JX Lin and J Vilcek
Tumor necrosis factor (TNF) and interleukin-1 (IL-1) were shown previously to be mitogenic for human fibroblasts. Here we show that recombinant human TNF and recombinant human IL-1 alpha increase steady state levels of c-fos and c-myc proto-oncogene mRNAs in quiescent human FS-4 fibroblasts. Proto-oncogene mRNA levels were enhanced within 20 min of TNF or IL-1 addition, peaked at 30 min, and declined to undetectable levels (c-fos) or basal levels (c-myc) by 60 or 90 min. A similar rapid increase in c-fos and c-myc mRNA was seen in quiescent FS- 4 cells exposed to cycloheximide. However, in the presence of cycloheximide, both proto-oncogene mRNA levels continued to rise for at least 90 min. The transient nature of the increase in c-myc mRNA levels appears to be a response characteristic for TNF and IL-1 because in quiescent FS-4 cells exposed to 10% fetal bovine serum, steady state levels of c-myc mRNA remained elevated for at least 4 h.
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