IL-1 induces expression of WAF1 mRNA in human fibroblasts: mechanisms of accumulation.
WAF1 inhibits cyclin-cyclin dependent kinase complexes, causing arrest in the cell cycle. We report that interleukin-1 (IL-1) regulates the levels of WAF1 protein and mRNA in human fibroblasts. Further studies showed that 12-O-tetradecanoyl phorbol 13-acetate (TPA) enhanced the accumulation of WAF1; cells refractory to TPA still increased their levels of WAF1 mRNA when exposed to IL-1. IL-1 also increased transcription of WAF1 by 13-fold and WAF1 mRNA became 2-fold more stable in cells stimulated with IL-1 (t1/2 = 2 h) as compared to untreated cells (t1/2 = 1 h). In summary, IL-1 induces expression of WAF1, and this occurs by increased transcription of WAF1 and stabilization of WAF1 mRNA. Our data also indicate that the induction of WAF1 mRNA by IL-1 occurs through a pathway independent of protein kinase C activation.
D002460:Cell Line; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000096:biosynthesis*; D004791:Enzyme Inhibitors / Q000378:metabolism*; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D007700:Kinetics; D008168:Lung; D012333:RNA, Messenger / Q000096:biosynthesis; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004791:Enzyme Inhibitors; D007375:Interleukin-1; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D013755:Tetradecanoylphorbol Acetate