Journal
BIOMOLECULES & THERAPEUTICS
Volume 24, Issue 6, Pages 604-609Publisher
KOREAN SOC APPLIED PHARMACOLOGY
DOI: 10.4062/biomolther.2016.028
Keywords
5-fluorouracil (5-FU); alpha-mangostin; Oxidative damages; Apoptosis
Funding
- GRRC program of Gyeonggi province [GRRC-DONGGUK2015-B02]
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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 a-mangostin can sensitize 5-FU-resistant SNUC5/5-FUR colon cancer cells to apoptosis. Exposure of a-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 a-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 a-mangostin-mediated apoptosis in SNUC5/5-FUR cells. Together, our study illustrates that a-mangostin might be an efficient apoptosis sensitizer that can overcome chemoresistance against 5-FU by activating apoptosis pathway.
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