title: [Restorative effect of quercetin on subcellular distribution of daunorubicin in multidrug resistant leukemia cell lines K562/ADM and HL-60/ADM].
abstract: OBJECTIVE
  Quercetin, a widely distributed natural flavonoid with a variety of biological functions, can reverse multidrug resistance (MDR) in leukemia according to recent researches. This study was to investigate the mechanism of quercetin restoring subcellular distribution of daunorubicin (DNR) in multidrug resistant leukemia cell lines, K562/ADM and HL-60/ADM, and reversing their MDR.
  
  
  METHODS
  MTT cell viability assay was used to verify the sensitization of DNR by quercetin in K562/ADM and HL-60/ADM cells,and determine the reverse concentration extent,confocal laser scanning microscope was used to observe the subcellular distribution of DNR in K562/ADM and HL-60/ADM cells,and relevant sensitive cell lines, K562/S and HL-60/S,before and after quercetin exposion.
  
  
  RESULTS
  Compared with K562/S and HL-60/S cells,20-40 micromol/L of quercetin in vitro remarkably enhanced the sensitivity of K562/ADM and HL-60/ADM cells to DNR, restore the subcellular distribution of DNR, so as to reverse MDR.
  
  
  CONCLUSIONS
  quercetin could be a candidate of effective multidrug resistance-reversing agent in leukemia chemotherapy.
authors.affiliation: Department of Oncology, Shanghai No. 6 People's Hospital, Shanghai Jiaotong University, Shanghai 200233, P.R. China. caixuncn@yahoo.com.cn
authors.forename: Xun
authors.initials: X
authors.lastname: Cai
authors.forename: Fang-Yuan
authors.initials: FY
authors.lastname: Chen
authors.forename: Jie-Ying
authors.initials: JY
authors.lastname: Han
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Gu
authors.forename: Hua
authors.initials: H
authors.lastname: Zhong
authors.forename: Ren-Rong
authors.initials: RR
authors.lastname: Ouyang
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000493:pharmacokinetics / Q000494:pharmacology; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D003630:Daunorubicin / Q000493:pharmacokinetics* / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D018922:HL-60 Cells; D006801:Humans; D020128:Inhibitory Concentration 50; D020014:K562 Cells; D011794:Quercetin / Q000494:pharmacology*
chemical_list: D000903:Antibiotics, Antineoplastic; D011794:Quercetin; D003630:Daunorubicin