| Literature DB >> 18583030 |
Hong-Ye Zhao1, Akio Ooyama, Masatatsu Yamamoto, Ryuji Ikeda, Misako Haraguchi, Sho Tabata, Tatsuhiko Furukawa, Xiao-Fang Che, Ken-ichi Iwashita, Toshinori Oka, Masakazu Fukushima, Masayuki Nakagawa, Mayumi Ono, Michihiko Kuwano, Shin-ichi Akiyama.
Abstract
5-FU is commonly used for treatment of various solid tumors including colon carcinoma. We have previously demonstrated that Egr-1 induced by 5-FU enhanced TSP-1 expression in human colon cancer KM12C cells. In this study, a Genechip analysis of KM12C cells treated with 5-FU revealed down-regulation of 924 genes and up-regulation of 460 genes. The decreased expression of c-Myc mRNA and phosphorylated c-Myc were detected and confirmed by RT-PCR and immunoblotting. Since 5-FU induced the expression of TSP-1, we examined the effect of c-Myc on the TSP-1 promoter. Deletion of the TSP-1 promoter region in which binding sites for c-Myc reside had no effect on the TSP-1 promoter activity induced by 5-FU. Meanwhile, 5-FU dose-dependently decreased the expression of miR-17-92 cluster. These findings suggest that 5-FU decreased the expression of c-Myc and consequently miR-17-92 cluster and increased the expression of TSP-1 mRNA.Entities:
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Year: 2008 PMID： 18583030 DOI： 10.1016/j.canlet.2008.04.045
Source DB: PubMed Journal: Cancer Lett ISSN： 0304-3835 Impact factor: 8.679