title: Suppression of multidrug resistance via inhibition of heat shock factor by quercetin in MDR cells.
abstract: MDR1 promoter has been shown to contain heat shock elements (HSE), and it has been reported that FM3A/M and P388/M MDR cells show a constitutively activated heat shock factor (HSF), suggesting that HSF might be an important target for reversing the multidrug resistance. Therefore, it was examined whether quercetin, which has been shown to interfere with the formation of the complex between HSE and HSF, and to downregulate the level of HSF1, can sensitize MDR cells against anticancer drugs by inhibition of HSF DNA-binding activity. In this study, quercetin appeared to inhibit the constitutive HSF DNA-binding activity and the sodium arsenite-induced HSF DNA-binding activity in the MDR cells. The basal and sodium arsenite-induced MDRCAT activities were remarkably suppressed by the treatment of quercetin. These results were well consistent with the finding that the treatment of quercetin decreased the expression level of P-gp, MDR1 gene product, in dose-dependent manner, and markedly increased the sensitivity of MDR cells to vincristine or vinblastine. These results suggest that quercetin can decrease the expression of P-gp via inhibition of HSF DNA-binding activity, and might be useful as a chemosensitizer in MDR cells.
authors.affiliation: Department of Biochemistry, College of Medicine, Pusan National University, Korea.
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
authors.forename: G S
authors.initials: GS
authors.lastname: Yeo
authors.forename: Y S
authors.initials: YS
authors.lastname: Lim
authors.forename: C D
authors.initials: CD
authors.lastname: Kang
authors.forename: C M
authors.initials: CM
authors.lastname: Kim
authors.forename: B S
authors.initials: BS
authors.lastname: Chung
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000187:drug effects / Q000235:genetics; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D018053:Arsenites / Q000494:pharmacology; D002277:Carcinoma / Q000188:drug therapy; D018432:Drug Resistance, Multiple / Q000502:physiology*; D019008:Drug Resistance, Neoplasm / Q000502:physiology; D006360:Heat-Shock Proteins / Q000037:antagonists & inhibitors / Q000187:drug effects* / Q000378:metabolism; D007942:Leukemia, Experimental / Q000188:drug therapy; D051379:Mice; D011794:Quercetin / Q000494:pharmacology*; D017670:Sodium Compounds / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014747:Vinblastine / Q000494:pharmacology; D014750:Vincristine / Q000494:pharmacology
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D018053:Arsenites; D006360:Heat-Shock Proteins; D017670:Sodium Compounds; C017947:sodium arsenite; D014750:Vincristine; D014747:Vinblastine; D011794:Quercetin