title: Arsenic trioxide inhibits proliferation in K562 cells by changing cell cycle and survivin expression.
abstract: To study the mechanisms involved in the inhibition of chronic myeloid leukemic cells (K562) proliferation induced by arsenic trioxide (As2O3) and to explore the potential role of Survivin, an inhibitor of apoptosis protein, in the regulation of As2O3 induced cell apoptosis, K562 cells were cultured with As2O3 of different concentrations. Cells were collected for proliferation analysis by MTT assay. Cell cycle distribution and cell apoptosis were analyzed by flow cytometry. Expression of Survivin protein and mRNA were detected by flow cytometry and RT-PCR, respectively. Our results showed that As2O3(2-10 micromol/L) inhibited K562 cells growth effectively, but it did not induce cells apoptosis significantly. The percentage of K562 cells at G2/M phase increased in proportion to As2O3 concentrations, and the expression of Survivin mRNA and content of Survivin protein was up-regulated accordingly. It is concluded that As2O3 inhibited K562 cells growth by inducing cell cycle arrest mainly at G2/M phase. Over-expression of Survivin gene and protein might be one of the possible mechanisms contributing to K562 cells' resistance to As2O3-induced apoptosis.
authors.affiliation: Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Wu
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Chen
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Zhou
authors.forename: Yong
authors.initials: Y
authors.lastname: You
authors.forename: Weiming
authors.initials: W
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Zou
mesh_terms: D000951:Antigens, Neoplasm / Q000096:biosynthesis / Q000235:genetics; D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects*; D000077237:Arsenic Trioxide; D001152:Arsenicals / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D020014:K562 Cells; D008869:Microtubule-Associated Proteins / Q000096:biosynthesis* / Q000235:genetics; D009363:Neoplasm Proteins; D010087:Oxides / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D000077022:Survivin
chemical_list: D000951:Antigens, Neoplasm; D000970:Antineoplastic Agents; D001152:Arsenicals; C107489:BIRC5 protein, human; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D010087:Oxides; D012333:RNA, Messenger; D000077022:Survivin; D000077237:Arsenic Trioxide