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Sensitization of 5-Fluorouracil-Resistant SNUC5 Colon Cancer Cells to Apoptosis by α-Mangostin

  • Lee, June (College of Pharmacy, Dongguk University) ;
  • Kang, Jong-Su (College of Pharmacy, Dongguk University) ;
  • Choi, Bu-Young (Department of Pharmaceutical Science and Engineering, Seowon University) ;
  • Keum, Young-Sam (College of Pharmacy, Dongguk University)
  • Received : 2016.02.11
  • Accepted : 2016.04.07
  • Published : 2016.11.01

Abstract

5-fluorouracil (5-FU) is a chemotherapeutic agent commonly used for treatment of solid tumors, including colorectal cancer. However, chemoresistance against 5-fluorouracil (5-FU) often limits its success for chemotherapy and, therefore, finding out appropriate adjuvant(s) that might overcome chemoresistance against 5-FU bears a significant importance. In the present study, we have found that ${\alpha}$-mangostin can sensitize 5-FU-resistant SNUC5/5-FUR colon cancer cells to apoptosis. Exposure of ${\alpha}$-mangostin induced significant DNA damages and increased the intracellular 8-hydroxyguanosine (8-OH-G) and 4-hydroxynonenal (4-HNE) levels in SNUC5 and SNUC5/5-FUR cells. Western blot analysis illustrated that ${\alpha}$-mangostin-induced apoptosis was mediated by the activation of the extrinsic and intrinsic pathways in SNUC5/5-FUR cells. In particular, we observed that Fas receptor (FasR) level was lower in SNUC5/5-FUR cells, compared with SNUC5 cells and that silencing FasR attenuated ${\alpha}$-mangostin-mediated apoptosis in SNUC5/5-FUR cells. Together, our study illustrates that ${\alpha}$-mangostin might be an efficient apoptosis sensitizer that can overcome chemoresistance against 5-FU by activating apoptosis pathway.

Keywords

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