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The transient induction of c-fos mRNA and protein suggests that regulation occurs not only by transcriptional activation but also at the level of turnover of the gene product. Here we present evidence for the rapid turnover of c-fos mRNA and some of the requirements for its specific degradation. The half life of induced mature cytoplasmic c-fos mRNA is 9 min in both serum-starved and growing primary human fibroblasts and in NIH 3T3 cells. A structure present at the 3' end of the c-fos mRNA molecule is involved in its low stability since the substitution or the removal of the untranslated 3' portion prolongues the RNA life time. The rapid turnover of fos mRNA requires, in addition, continued protein synthesis. Treatment of cells with cycloheximide stabilizes c-fos mRNA. Washing out cycloheximide reestablishes the rapid turnover. Both changes occur with lag periods of less than 17 minutes.
H J Rahmsdorf, and
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M Litfin, and
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May 1991,
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H J Rahmsdorf, and
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Molecular and cellular biochemistry,
H J Rahmsdorf, and
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Molecular and cellular biology,
