Abstract
Purpose
Urolithins, gut microbiota metabolites derived from ellagic acid and ellagitannins, reach micromolar concentrations in the colon lumen where can have anti-inflammatory and anticancer effects. The antiproliferative activity of urolithins (Uro-A, Uro-B, Uro-C and Uro-D) and their most relevant in vivo glucuronides were evaluated in three human colon cancer cell lines (Caco-2, SW480 and HT-29).
Methods
Cell proliferation was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide and Trypan blue exclusion assays. Cell cycle was evaluated by flow cytometry and urolithins metabolism by HPLC–MS/MS.
Results
Urolithins inhibited cell proliferation and cell cycle progression in a time- and dose-dependent manner and arrested the cells at S and G2/M phases, depending on the urolithin. Uro-A exerted the highest antiproliferative activity, followed by Uro-C, Uro-D and Uro-B. Unlike Caco-2 and SW480 cells, HT-29 cells partially overcame the effects after 48 h, which was related to the complete glucuronidation of urolithins. Uro-A or Uro-B glucuronides did not affect cell cycle and showed lower antiproliferative activity than their aglycone counterparts. Uro-A or Uro-B plus inhibitors of drug efflux ABC transporters partially prevented the glucuronidation of urolithins in HT-29 cells which became more sensitive.
Conclusions
Uro-A, Uro-B, Uro-C and Uro-D exerted different antiproliferative effects depending on the colon cancer cell line. We also report here, for the first time, the role of ABC transporters and Phase-II metabolism in HT-29 cells as a mechanism of cancer resistance against urolithins due to their conversion to glucuronide conjugates that exerted lower antiproliferative activity.
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Abbreviations
- ABC:
-
ATP-binding cassette
- ACN:
-
Acetonitrile
- ATP:
-
Adenosine-5′-triphosphate
- BCRP:
-
Breast cancer resistance protein
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMSO:
-
Dimethyl sulfoxide
- DNA:
-
Deoxyribonucleic acid
- EDTA:
-
Ethylenediaminetetraacetic acid
- ESI:
-
Electrospray interface
- Glur:
-
Glucuronide
- HPLC:
-
High-performance liquid chromatography
- IT:
-
Ion trap
- MDCKII:
-
Mardin–Darby canine kidney
- MEM:
-
Minimal essential medium
- MeOH:
-
Methanol
- MRP:
-
Multidrug resistant protein
- MS:
-
Mass spectrometry
- MTT:
-
3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide
- OH-:
-
Hydroxyl groups
- PBS:
-
Phosphate-buffered saline
- P-gp:
-
P-glycoprotein
- RNA:
-
Ribonucleic acid
- SD:
-
Standard deviation
- TNF-α:
-
Tumor necrosis factor alpha
- UGTs:
-
UDP-glucuronosyltransferases
- Uro:
-
Urolithins
- UV:
-
Ultraviolet
- μM:
-
Micromolar
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Acknowledgments
This work was funded by the Projects CICYT AGL2011-22447 (MINECO, Spain), Consolider Ingenio 2010 (CSD2007-00063, Fun-C-Food), and Fundación Seneca de la Región de Murcia, Spain (Grupo de Excelencia GERM 06 04486 and 05556/PI/04).
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Authors declare no conflict of interests.
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González-Sarrías, A., Giménez-Bastida, J.A., Núñez-Sánchez, M.Á. et al. Phase-II metabolism limits the antiproliferative activity of urolithins in human colon cancer cells. Eur J Nutr 53, 853–864 (2014). https://doi.org/10.1007/s00394-013-0589-4
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DOI: https://doi.org/10.1007/s00394-013-0589-4