Transcriptional regulation of c-jun gene expression by arabinofuranosylcytosine in human myeloid leukemia cells

The Journal of Clinical Investigation
S KharbandaD W Kufe

Abstract

Previous studies have demonstrated that 1-beta-D-arabinofuranosylcytosine (ara-C) induces terminal differentiation of human myeloid leukemia cells. Other studies have shown that the c-jun protooncogene is expressed during phorbol ester-induced myeloid differentiation. This work examines the effects of ara-C on c-jun gene expression in human KG-1 myeloid leukemia cells. The results demonstrate that c-jun transcripts are undetectable in uninduced KG-1 cells and that ara-C induces expression of this gene in a concentration- and time-dependent manner. Ara-C treatment was also associated with increases in c-jun transcripts in U-937, THP-1, and HL-60 myeloid leukemia cells. Furthermore, transcriptional run-on analysis has demonstrated that exposure to ara-C increases the rate of c-jun gene transcription. The results also demonstrate that while inhibition of protein synthesis superinduces c-jun mRNA levels in phorbol ester-treated KG-1 cells, cycloheximide had no effect on the induction of c-jun transcripts during ara-C treatment. Moreover, the half-life of c-jun transcripts in ara-C-treated KG-1 cells was 42 min. These findings suggest that the increase in c-jun mRNA observed during ara-C treatment is regulated by a transcriptional m...Continue Reading

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Citations

Apr 2, 1999·The European Journal of Neuroscience·M J Courtney, E T Coffey
Jun 15, 1992·Proceedings of the National Academy of Sciences of the United States of America·S HorieR J Alpern
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