title: [Reversal effect of sodium selenite on multidrug resistance in K562/ADR cell line and its mechanisms].
abstract: This study was purposed to investigate the reversal effect of sodium selenite on multidrug resistance in adriamycin-resistant leukemic cell line K562/ADR and its mechanisms. The cytotoxicity and the reversal effect of sodium selenite on K562/ADR cells were assayed by MTT method; the apoptosis rate of K562 and K562/ADR cells were detected by flow cytometery, the mRNA expressions of mdr1 and bcl-2 were measured by semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR). The results showed that 10 micromol/L sodium selenite significantly increased the cytotoxicity of adriamycin to K562/ADR cell and the reverse index (RI) was 2.31; the early apoptosis rate of K562 cells was elevated after treatment with 5 micromol/L Na(2)SeO(3) for 48 hours; and the medium-term and late apoptosis rate was elevated after treatment with both 5 and 10 micromol/L Na(2)SeO(3) for 48 and 72 hours. Both doses of 5 and 10 micromol/L Na(2)SeO(3) increased the early apoptosis rate of K562/ADR at 48 hours, and also increased the medium-term and late apoptosis rate after treating for 48 and 72 hours. The apoptosis rate was higher at dose of 10 micromol/L than that at 5 micromol/L, the apoptosis rate at 72 hours also was higher than that at 48 hours. The expressions of mdr1 mRNA and bcl-2 mRNA were decreased significantly by 10 micromol/L sodium selenite. It is concluded that sodium selenite can reverse the multidrug resistance in K562/ADR partially by down-regulating the expressions of mdr1 mRNA and bcl-2 mRNA, and increasing apoptosis rate of K562/ADR cells.
authors: Department of Hematology, Beijing Tongren Hospital, Capital University of Medical Sciences, Beijing100730, China.
authors: Jing
authors: J
authors: Cui
authors: Jing
authors: J
authors: Ding
authors: Yi-Ping
authors: YP
authors: Wu
authors: Fu-Qiang
authors: FQ
authors: Liu
authors: Xiao-Chao
authors: XC
authors: Liu
authors: Yang
authors: Y
authors: Wang
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects*; D004317:Doxorubicin / Q000494:pharmacology*; D018432:Drug Resistance, Multiple / Q000187:drug effects; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D006801:Humans; D020014:K562 Cells; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D018038:Sodium Selenite / Q000494:pharmacology*
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger; D004317:Doxorubicin; D018038:Sodium Selenite