title: Reversal of in vitro cellular MRP1 and MRP2 mediated vincristine resistance by the flavonoid myricetin.
abstract: In the present study, the effects of myricetin on either MRP1 or MRP2 mediated vincristine resistance in transfected MDCKII cells were examined. The results obtained show that myricetin can inhibit both MRP1 and MRP2 mediated vincristine efflux in a concentration dependent manner. The IC50 values for cellular vincristine transport inhibition by myricetin were 30.5+/-1.7 microM for MRP1 and 24.6+/-1.3 microM for MRP2 containing MDCKII cells. Cell proliferation analysis showed that the MDCKII control cells are very sensitive towards vincristine toxicity with an IC50 value of 1.1+/-0.1 microM. The MDCKII MRP1 and MRP2 cells are less sensitive towards vincristine toxicity with IC50 values of 33.1+/-1.9 and 22.2+/-1.4 microM, respectively. In both the MRP1 and MRP2 cells, exposure to 25 microM myricetin enhances the sensitivity of the cells towards vincristine toxicity to IC50 values of 7.6+/-0.5 and 5.8+/-0.5 microM, respectively. The increase of sensitivity represents a reversal of the resistance towards vincristine as a result of MRP1 and MRP2 inhibition. Thus, the present study demonstrates the ability of the flavonoid myricetin to modulate MRP1 and MRP2 mediated resistance to the anticancer drug vincristine in transfected cells, indicating that flavonoids might be a valuable adjunct to chemotherapy to block MRP mediated resistance.
authors.affiliation: Division of Toxicology, Wageningen University, P.O. Box 8000, 6700 EA, Wageningen, The Netherlands. Jelmer.vanZanden@wur.nl
authors.forename: Jelmer J
authors.initials: JJ
authors.lastname: van Zanden
authors.forename: Anika
authors.initials: A
authors.lastname: de Mul
authors.forename: Heleen M
authors.initials: HM
authors.lastname: Wortelboer
authors.forename: Mustafa
authors.initials: M
authors.lastname: Usta
authors.forename: Peter J
authors.initials: PJ
authors.lastname: van Bladeren
authors.forename: Ivonne M C M
authors.initials: IM
authors.lastname: Rietjens
authors.forename: Nicole H P
authors.initials: NH
authors.lastname: Cnubben
mesh_terms: D000818:Animals; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D019008:Drug Resistance, Neoplasm / Q000187:drug effects* / Q000502:physiology; D005419:Flavonoids / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D049990:Membrane Transport Modulators; D026901:Membrane Transport Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D014750:Vincristine / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D005419:Flavonoids; D049990:Membrane Transport Modulators; D026901:Membrane Transport Proteins; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D014750:Vincristine; C000715087:ABCC2 protein, human; C040015:myricetin; C421109:multidrug resistance-associated protein 1