title: Tumor necrosis factor and interleukin-1 cause a rapid and transient stimulation of c-fos and c-myc mRNA levels in human fibroblasts.
abstract: 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.
mesh_terms: D003513:Cycloheximide / Q000494:pharmacology; D005347:Fibroblasts / Q000187:drug effects* / Q000378:metabolism; D006023:Glycoproteins / Q000494:pharmacology*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D007700:Kinetics; D000090063:Proto-Oncogene Mas; D011519:Proto-Oncogenes; D012333:RNA, Messenger / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha
chemical_list: D006023:Glycoproteins; D007375:Interleukin-1; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D012333:RNA, Messenger; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D003513:Cycloheximide