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Abstract

Induction of c-jun expression in the myeloid leukemia cell line KG-1 by 1-beta-D-arabinofuranosylcytosine.

R Henschler, U Brennscheidt, R Mertelsmann and F Herrmann
Molecular Pharmacology February 1991, 39 (2) 171-176;
R Henschler
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U Brennscheidt
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R Mertelsmann
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F Herrmann
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Abstract

c-Jun/AP-1 is a transcription factor commonly induced in mammalian cells by serum, phorbol compounds, or peptide growth factors. We show that c-Jun/AP-1 is inducible as well as coordinately regulated, in the human acute myelogenous leukemia cell line KG-1, by the cytostatic drug 1-beta-D-arabinofuranosylcytosine (Ara-C). Concomitantly with Ara-C treatment, growth inhibition and loss of clonogenic survival of KG-1 cells were observed. Whereas KG-1 cells displayed only barely detectable amounts of c-jun transcripts when cultured in the presence of serum, Ara-C at concentrations of 1 to 50 microM induced c-jun transcripts in a dose-dependent fashion. Time course studies showed that 10 microM Ara-C induced c-jun transcripts 6 hr after initiation of culture. Induction of c-jun mRNA was independent of de novo protein synthesis, because the protein synthesis inhibitor cycloheximide failed to alter Ara-C-induced c-jun mRNA accumulation. Furthermore, cycloheximide did not induce c-jun transcripts, ruling out the possibility of posttranscriptional stabilization of c-jun mRNA by labile proteins, as has been previously reported for a variety of serum-inducible protooncogenes and early response genes. Moreover, nuclear run-on analysis disclosed that c-jun induction by Ara-C in KG-1 cells took place at a transcriptional level. Taken together, these findings indicate that c-jun mRNA, unlike its rapid (within minutes) induction by serum in fibroblasts, is induced by Ara-C in KG-1 cells following a much more prolonged time course and is regulated essentially at a transcriptional level.

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Molecular Pharmacology
Vol. 39, Issue 2
1 Feb 1991
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Abstract

Induction of c-jun expression in the myeloid leukemia cell line KG-1 by 1-beta-D-arabinofuranosylcytosine.

R Henschler, U Brennscheidt, R Mertelsmann and F Herrmann
Molecular Pharmacology February 1, 1991, 39 (2) 171-176;

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Abstract

Induction of c-jun expression in the myeloid leukemia cell line KG-1 by 1-beta-D-arabinofuranosylcytosine.

R Henschler, U Brennscheidt, R Mertelsmann and F Herrmann
Molecular Pharmacology February 1, 1991, 39 (2) 171-176;
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