The drug resistance suppression induced by curcuminoids in colon cancer SW-480 cells is mediated by reactive oxygen species-induced disruption of the microRNA-27a-ZBTB10-Sp axis
Article first published online: 8 MAR 2013
© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Molecular Nutrition & Food Research
Special Issue: Curcumin: Recent Insights, Novel Developments, New Challenges
Volume 57, Issue 9, pages 1638–1648, September 2013
How to Cite
Noratto, G. D., Jutooru, I., Safe, S., Angel-Morales, G. and Mertens-Talcott, S. U. (2013), The drug resistance suppression induced by curcuminoids in colon cancer SW-480 cells is mediated by reactive oxygen species-induced disruption of the microRNA-27a-ZBTB10-Sp axis. Mol. Nutr. Food Res., 57: 1638–1648. doi: 10.1002/mnfr.201200609
- Issue published online: 2 SEP 2013
- Article first published online: 8 MAR 2013
- Manuscript Accepted: 8 JAN 2013
- Manuscript Revised: 5 JAN 2013
- Manuscript Received: 13 SEP 2012
- Sp-transcription factors;
Mechanisms involving the curcuminoids effects in decreasing the prooncogenic specificity protein (Sp) transcription factors, and Sp-regulated genes in SW-480 colon cancer cells and how the multidrug resistance protein (MDR1) inhibition is mediated by Sp suppression.
Methods and results
HT-29 and SW-480 colon cancer and normal CCD-18Co colon fibroblast cells were treated with curcuminoids previously analyzed by HPLC. Gene and protein expression regulation were assessed by RT-PCR, transfections with expression constructs, and Western blots. Curcuminoids (2.5–10 μg/mL) suppressed preferentially the growth of SW-480 and HT-29 compared to CCD-18Co cells and enhanced the anticancer activity of the chemotherapeutic drug 5-fluorouracil due to the suppression of MDR1. Additionally, Sp1, Sp3, and Sp4 and Sp-regulated genes were downregulated by curcuminoids in SW-480 and this was accompanied by suppression of microRNA-27a (miR-27a) and induction of ZBTB10, an mRNA target of miR-27a and a transcriptional repressor of Sp expression. This mechanism was mediated by the induction of ROS. RNA-interference and transfection with ZBTB10-expression plasmid demonstrated that MDR1 was regulated by Sp1 and Sp3 and the disruption of the miR-27a-ZBTB10-Sp axis.
Colon cancer treatment with curcuminoids will enhance the therapeutic effects of drugs in patients who have developed drug resistance.