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- W1560784673 abstract "AIM: To evaluate the effect of reactive oxygen species suchas hydrogen peroxide on the progression of human coloncancer.METHODS: Human colon carcinoma cell lines, LS174T andHCT8, were treated respectively with 10- 5,10- 7 or 10- 9 mol@L- 1 hydrogen peroxide for 24h, and co-cultured with humanendothelial cell line ECV-304. The migration of ECV-304induced by cancer cells was calculated and the expressionlevel of vascular endothelial growth factor in cancer cellswas determined by RT-PCR analysis and ELISA.Dactinomycin of 1.5mg@ L-1 which could block transcriptionof cancer cells was applied to observe the effects of H2O2 ontranscriptional activity and the relative half-life of VEGFmRNA. Finally, to evaluate the effect H2O2 on NF-κB activityin colon cancer cells, NF-κB in cytoplasm and nucleus of thecells were detected with FITC-tagged antibody and itspresence in the nucleus (Fn ) Vs cytoplasm ( Fc ) wasmonitored by measuring the green fluorescence integratedover the nucleus by laser scanning cytometry(LSC).RESULTS: Exogenouse hydrogen peroxide of lowconcentration increased the migration of endothelial cellsinduced by colon cancer cells. When cancer cells weretreated with 10-5 mol@ L-1 H2O2, the migration number ofendothelial cells induced by LS174T cells was 203 ± 70, andthe number induced by HCT8 cells was 145 ± 65. The twovalues were significantly higher than those treated with otherconcentrations of h2O2 ( P ＜ 0.01 ). The expression ofvascular endothelial growth factor in cancer cells, whichcould be blocked by dactinomycin, were increased to acertain degree, while the relative half-life of VEGF mRNAwas not prolonged after treatment with hydrogen peroxide.The activity of NF-κB in colon cells rose after the cells wereexposed to hydrogen peroxide for 24h. The Fn values inHCT8 cells were 91 ± 13 (0 mol@ L- 1 h2O2) and 149 ± 40( 10-5mol@L-1 h2O2) ( P＜ 0.05), in LS174T cells were 127 ± 35(0mol@L-1 H2O2) and 192± 11(10-5 mol@L-1 h2O2) (P＜ 0.05).lt is similar to the case of VEGF expression in cancer cells.C" @default.
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- W1560784673 date "2002-01-01" @default.
- W1560784673 modified "2023-09-24" @default.
- W1560784673 title "Upregulation of vascular endothelial growth factor by hydrogen peroxide in human colon cancer" @default.
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