Abstract Title:

Quercetin inhibits proliferation and drug resistance in KB/VCR oral cancer cells and enhances its sensitivity to vincristine.

Abstract Source:

Nutr Cancer. 2015 ;67(1):126-36. Epub 2014 Dec 16. PMID: 25514492

Abstract Author(s):

Zhaohu Yuan, Huili Wang, Ziyou Hu, Yanqing Huang, Fang Yao, Shumei Sun, Bingyi Wu

Article Affiliation:

Zhaohu Yuan


Quercetin has been confirmed to possess antihistamine, anti-inflammatory, antiviral, immunomodulatory, and antioxidant properties. Herein, we evaluated their antitumor activity in vitro by using KB/VCR oral cancer cells. We found that quercetin at 25 to 100μmol/L effectively inhibited the migration and invasion of KB/VCR cells. Quercetin at dose ranging from 25 to 100 μmol/L significantly inhibited the growth of the KB/VCR cells and at 50 μmol/L arrested cells at the G1 phase and decreased the amount of cells in the S and G2 phase. Apoptosis analysis showed that quercetin at 50 or 100 μmol/L induced apoptosis of KB/VCR cells by suppressing expression of Bax and inducing the expression of Caspase-3 and Bcl-2. Furthermore, we also confirmed that quercetin from 25 to 100 μmol/L reversed gene-encoded Pglycoprotein (P-gp)-mediated MDR in KB/VCRcells by inhibiting the expression of P-gp. For combination treatment with vincristin (0.375 μmol/L) and quercetin (50 μmol/L), the proliferation rate significantly decreased and apoptosis rate significantly increased. This study provided evidence that quercetin induced apoptosis and reversed drugresistance in oral tumor cells and may be a potential candidate for other tumors treatment.

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