title: [Effects of arsenic trioxide on expressions of vascular endothelial growth factor and P-glycoprotein in multidrug resistant leukemia cell line K562/A02].
abstract: OBJECTIVE
  To investigate the effects of arsenic trioxide (ATO) on the expressions of vascular endothelial growth factor (VEGF) and P-glycoprotein (P-gp) in K562/A02 cells and to explore the correlation between VEGF and P-gp.
  
  
  METHODS
  The inhibition rate of K562/A02 cell proliferation was detected by using methyl thiazolyl tetrazolium assay (MTT); the level of VEGF was detected by enzyme-linked immunosorbent assay (ELISA) and the expression rate of P-gp was determined by flow cytometry (FCM).
  
  
  RESULTS
  0.05 micromol/L ATO had no influences on the cell proliferation and the expression of VEGF in K562/A02 cells; 0.4 and 3.2 micromol/L ATO could significantly inhibit the K562/A02 cell proliferation and down-regulate the expression of VEGF in K562/A02 cells (P<0.05). The expression of P-gp did not changed after being exposed to 0.05 and 0.4 micromol/L ATO for 24, 48 and 72 hours (P>0.05). 3.2 micromol/L ATO could remarkably reduce the expression of P-gp in K562/A02 cells after 48- and 72-hour incubation with ATO (P<0.05).
  
  
  CONCLUSIONS
  The down-regulation of P-gp and VEGF after being exposed to ATO probably contributes to the reversion of multidrug resistance in K562/A02 cells. The level of VEGF may be related to the expression rate of P-gp in K562/A02 cells.
authors.affiliation: Medical College, Yangzhou University, Yangzhou, Jiangsu Province 225001, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Liang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jian-dong
authors.initials: JD
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Gu
authors.forename: Li
authors.initials: L
authors.lastname: Ma
authors.forename: Xiao-ling
authors.initials: XL
authors.lastname: Wang
authors.forename: Wei-gan
authors.initials: WG
authors.lastname: Shen
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism*; D000970:Antineoplastic Agents / Q000494:pharmacology; D000077237:Arsenic Trioxide; D001152:Arsenicals / Q000494:pharmacology*; D049109:Cell Proliferation; D015536:Down-Regulation / Q000187:drug effects; D004317:Doxorubicin; D018432:Drug Resistance, Multiple / Q000187:drug effects*; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D006801:Humans; D020014:K562 Cells; D010087:Oxides / Q000494:pharmacology*; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D001152:Arsenicals; D010087:Oxides; D042461:Vascular Endothelial Growth Factor A; D004317:Doxorubicin; D000077237:Arsenic Trioxide