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- W2330378242 abstract "Abstract Colorectal cancer is a common cancer with high mortality rate. Despite being the standard anti–colorectal cancer drug, 5-fluorouracil (5-FU) exhibits only limited therapeutic benefits. Herein, we investigated whether paricalcitol, a synthetic vitamin D analogue with potential antitumor properties, would enhance the chemopreventive efficacy of 5-FU on an intermediate-term (15 weeks) model of colorectal tumors induced by azoxymethane (AOM) in rats. After AOM injection, 5-FU was administered during the 9th and 10th weeks (12 mg/kg/day for 4 days, then 6 mg/kg every other day for another 4 doses), whereas paricalcitol (2.5 μg/kg/day; 3 days/week) was given from the 7th to the 15th week. At week 15, the animals were euthanized and their resected colons were examined macroscopically and microscopically. Quantitative RT-PCR was used to measure the transcription activities of Wnt, β-catenin, DKK-1, CDNK-1A, NF-κB, and COX-2 genes, and ELISA was used to quantify the protein levels of β-catenin, COX-2, HSP90, and VEGF. IHC was additionally used to measure β-catenin, HSP90, and inducible nitric oxide synthase (iNOS). Compared with their individual therapy, combination of 5-FU and paricalcitol showed more significant reducing effect on numbers of grown tumors and large aberrant crypts foci. Mechanistically, paricalcitol and 5-FU had cooperated together to repress the expression of procancerous Wnt, β-catenin, NF-κB, COX-2, iNOS, VEGF, and HSP-90 more, and to upregulate the expression of antitumorigenesis DKK-1 and CDNK-1A, compared with their monotherapies. Our findings suggest that combined use of paricalcitol with 5-FU exhibits an augmenting chemopreventive effect against colorectal tumors, and might potentially be useful for chemoprevention in colorectal cancer patients. Cancer Prev Res; 9(6); 491–501. ©2016 AACR." @default.
- W2330378242 created "2016-06-24" @default.
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- W2330378242 date "2016-05-31" @default.
- W2330378242 modified "2023-09-26" @default.
- W2330378242 title "Paricalcitol Enhances the Chemopreventive Efficacy of 5-Fluorouracil on an Intermediate-Term Model of Azoxymethane-Induced Colorectal Tumors in Rats" @default.
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- W2330378242 doi "https://doi.org/10.1158/1940-6207.capr-15-0439" @default.
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