title: [Effect of rapamycin on apoptosis in human myelodysplastic syndrome cell line MUTZ-1 and its possible mechanisms].
abstract: The aim of this study was to investigate the effect of rapamycin on cell growth and apoptosis in the myelodysplastic syndrome (MDS) cell line MUTZ-1 and possible mechanism. MUTZ-1 cells were treated with rapamycin, cell proliferation capability was determined with MTT, protein expression including Annexin V/PI, caspase 3, PTEN, p-Akt, p-mTOR and the cell cycle were analyzed with flow cytometry. The results indicated that the proliferation of MUTZ-1 cells was inhibited by rapamycin in concentration-and time-dependent manners (r=0.67, 0.61, 0.72). After treatment with rapamycin for 24-72 hours, cell count in G0/G1 were significantly higher than that of the control (p<0.01), and this effect showed a time-and concentration-dependency (r=0.94, 0.93, 0.92), the cell cycle was blocked in G0/G1 phase. As compared with control group, the proportion of Annexin V+PI-MUTZ-1 cells and the cellular PTEN levels increased in the treated group dramatically and in time-and dose-dependent manners (p<0.01). To the contrary, level of p-mTOR expression markedly decreased as compared with control group (p<0.05). It is concluded that the rapamycin inhibits the proliferation of MUTZ-1 cells, down-regulates the PTEN/PI3K-Akt/mTOR signaling pathway by interaction with mTOR, which induces the apoptosis of mUTZ-1 cells.
authors.affiliation: Central Laboratory, Taizhou Hospital, Wenzhou Medical College, Linhai 317000, Zhejiang Province, China. baoguochen@126.com
authors.forename: Bao-Guo
authors.initials: BG
authors.lastname: Chen
authors.forename: Qun-Yi
authors.initials: QY
authors.lastname: Guo
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Yan
authors.forename: Ying-Qiu
authors.initials: YQ
authors.lastname: Pan
authors.forename: Rui
authors.initials: R
authors.lastname: Zheng
authors.forename: Bo-Li
authors.initials: BL
authors.lastname: Li
authors.forename: Wen-Da
authors.initials: WD
authors.lastname: Luo
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D009190:Myelodysplastic Syndromes / Q000378:metabolism / Q000473:pathology*; D015398:Signal Transduction / Q000187:drug effects*; D020123:Sirolimus / Q000494:pharmacology*; D058570:TOR Serine-Threonine Kinases / Q000378:metabolism
chemical_list: C546842:MTOR protein, human; D058570:TOR Serine-Threonine Kinases; D020123:Sirolimus