J Cancer 2017; 8(18):3697-3706. doi:10.7150/jca.20196

Research Paper

Curcumin Enhances the Anticancer Effect Of 5-fluorouracil against Gastric Cancer through Down-Regulation of COX-2 and NF- κB Signaling Pathways

Hongru Yang1, 2, Shaoqiu Huang3, Yumeng Wei3, Shousong Cao4, Chao Pi3, Ting Feng3, Jing Liang3, Ling Zhao3✉, Guosheng Ren1✉

1. The First Affiliated Hospital of Chongqing Medical University, No.1 Yixue Road, Yuzhong District, Chongqing 400016, China;
2. The Affiliated Hospital of Southwest Medical University, No.5 Taiping Street, Jiangyang District, Luzhou , Sichuan 646099, China;
3. Department of Pharmaceutics, School of Pharmacy, Southwest Medical University, No.3-5, Zhongshan Road, Jiangyang District, Luzhou, Sichuan 646000, China;
4. Department of Pharmacology, School of Pharmacy, Southwest Medical University, No.3-5, Zhongshan Road, Jiangyang District, Luzhou, Sichuan 646000, China.

Abstract

Background: 5-fluorouracil (5-FU) is one of the most commonly used first-line anticancer drugs to treat gastric cancer in clinical practice. However, severe adverse events such as gastrointestinal toxicity and bone marrow suppression limit its clinical application. Combination chemotherapy to combine two or more anticancer drugs with different mechanistic action is an effective anticancer strategy against gastric cancer. Therefore, we studied the anticancer effect of the combination of 5-FU with curcumin against gastric cancer MKN45 and AGS cells (normal gastric mucosal GES-1 cells as control) and associated molecular mechanisms.

Methods: Cytotoxicity of 5-FU and curcumin alone or in combination was evaluated in MKN45, AGS and GES cells by MTT assay. The protein expressions of COX-2 and NF-κB were evaluated in MKN45 cells by Western blotting analysis. In addition, antitumor activity of 5-FU and curcumin alone or in combination was evaluated in nude mice bearing MKN45 tumor xenografts in vivo.

Results: The combination of 5-FU and curcumin (2:1, mol/mol) showed 2.2-, 3.5-fold and 2.3-, 3.9-fold enhanced cytotoxic effect compared to 5-FU or curcumin alone and generated synergistic effect at the concentration of 5-FU (>4.09 and >5.71 μmol/l) and curcumin (>2.05 and > 2.86 μmol/l) in MKN45 cells for 48 h and 72 h exposures, respectively. The combination of 5-FU and curcumin also potentiated cytotoxicity in AGS cells compared to 5-FU or curcumin alone but the effect was moderate. However, the cytotoxicity of 5-FU and curcumin alone or in combination was much less in GES-1 cells. Furthermore, the protein expressions of COX-2 and NF-κB in MKN45 cells were decreased by 44.79% and 37.67%, 47.17% and 48.21%, 60.21% and 62.44%, respectively, after treatment of curcumin (25 μmol/l) and 5-FU (50 μmol/l) alone or in combination for 48 h. Curcumin also enhanced the anticancer activity of 5-FU without increasing toxicity in nude mice bearing MKN45 tumor xenografts in vivo.

Conclusions: Curcumin enhances the anticancer effect of 5-FU against gastric cancer in vitro and in vivo. The possible molecular mechanism may be, at least in part, related to down-regulation of COX-2 and NF-κB pathways.

Keywords: 5-fluorouracil, curcumin, gastric cancer, MKN45 cell, COX-2, NF-κB.

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How to cite this article:
Yang H, Huang S, Wei Y, Cao S, Pi C, Feng T, Liang J, Zhao L, Ren G. Curcumin Enhances the Anticancer Effect Of 5-fluorouracil against Gastric Cancer through Down-Regulation of COX-2 and NF- κB Signaling Pathways. J Cancer 2017; 8(18):3697-3706. doi:10.7150/jca.20196. Available from http://www.jcancer.org/v08p3697.htm