title: [Effect of down-regulating mll-af9 gene expression on proliferation of acute monocytic leukemia cell line THP-1].
abstract: This study was aimed to investigate the effect of small interfering RNA (siRNA) on the expression of mll-af9 oncogene and the proliferation of human acute monocytic leukemia cell line THP-1. One group of siRNA was designed targeting mll-af9 mRNA and finally obtained by chemosynthesis. Then the obtained siRNA was transfected into cultured human acute monocytic leukemia cell line THP-1 by lipofectamine. Flow cytometry was used to detect siRNA transfection efficiency. The level of mll-af9 mRNA expression was analyzed by reverse transcription polymerase chain reaction (RT-PCR). The cell proliferation rate was assayed by MTT. The change of cell cycles and apoptosis rate was detected by flow cytometry. The results showed that the siRNA transfection efficiency was 69.1%+/-1.8%. The level of mll-af9 mRNA expression was significantly inhibited in siRNA-transfected cells as compared with the controls. mll-af9-targeted siRNA inhibited the proliferation of THP-1 cells and induced cell apoptosis effectively after transfection. The percentage of G0/G1 phase cells significantly increased in siRNA-transfected cells in comparion with the control cells, but the percentage of S phase cells significantly decreased. It is concluded that the mll-af9-targeted siRNA can effectively inhibit the proliferation of human acute monocytic leukemia cell line THP-1.
authors.affiliation: Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Zhang
authors.forename: Ling-Bo
authors.initials: LB
authors.lastname: Liu
authors.forename: Lan
authors.initials: L
authors.lastname: Bi
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Ya-Jie
authors.initials: YJ
authors.lastname: Zhao
authors.forename: Ping
authors.initials: P
authors.lastname: Zou
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation; D006801:Humans; D007948:Leukemia, Monocytic, Acute / Q000235:genetics* / Q000473:pathology*; D051788:Myeloid-Lymphoid Leukemia Protein / Q000235:genetics / Q000378:metabolism*; D015514:Oncogene Proteins, Fusion / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics*; D014162:Transfection
chemical_list: C474558:MLL-AF9 fusion protein, human; D015514:Oncogene Proteins, Fusion; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D051788:Myeloid-Lymphoid Leukemia Protein