Apoptotic response to 5-fluorouracil treatment is mediated by reduced polyamines, non-autocrine Fas ligand and induced tumor necrosis factor receptor 2 - PubMed (original) (raw)
. 2003 Sep-Oct;2(5):572-8.
doi: 10.4161/cbt.2.5.532.
Affiliations
- PMID: 14614330
- DOI: 10.4161/cbt.2.5.532
Apoptotic response to 5-fluorouracil treatment is mediated by reduced polyamines, non-autocrine Fas ligand and induced tumor necrosis factor receptor 2
Wei Zhang et al. Cancer Biol Ther. 2003 Sep-Oct.
Abstract
5-fluorouracil (5-FU) is the major chemotherapeutic agent for treatment of colorectal carcinoma, but the molecular mechanisms of response and resistance are not understood completely. We therefore studied the 5-FU dose response and time course of gene expression transcriptome changes in colon carcinoma cell lines that are relatively sensitive to or resistant to 5-FU (RKO and HT29, respectively. We identified cellular pathways and corroborated functions of selected pathways. Expression of genes for polyamine biosynthesis, i.e., ornithine decarboxylase (ODC) and spermine and spermidine synthases, was repressed in the sensitive line, while the biosynthesis-inhibiting gene ODC antizyme was induced in the resistant line. The rate-limiting gene in catabolism, spermine/spermidine acetyltransferase, was induced in both lines. Polyamine levels showed corresponding drastic decreases after 5-FU treatment, and polyamine replenishment interfered with 5-FU-induced apoptosis. In the sensitive cells which have wild-type p53, the p53 gene and its downstream genes including p21/WAF1, mdm2, Fas, mic-1, EphA2, and ferredoxin reductase as well as genes in the tumor necrosis factor (TNF) pathway including TNF receptor 2 (TNFR2) were induced, but not Fas ligand (FasL). Exposure to exogenous FasL increased 5-FU-induced apoptosis, and anti-TNFR2 antibody, but not anti-TNFR1, partially protected the sensitive cells. Our combination of gene expression profiling and corroborative functional studies revealed that reduced polyamine levels, non-autocrine FasL originating exogenous to tumor cells, and induced TNFR2 are all functional mediators of apoptosis caused by 5-FU in colon carcinoma cells.
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