title: Gene profiling after knocking-down expression of nucleostemin in Hela cells using oligonucleotide DNA microarray.
abstract: Nucleostemin (NS) is preferentially and exclusively expressed in the stem cells and cancer cells, but not in differentiated adult tissues and cells. NS is likely to take part in controlling the proliferation and differentiation switch in stem cells and progenitor cells. Its deregulation in cancer also contributes to the elevated proliferation and undifferentiation of cancer cells. However, the mechanisms by which NS helps to maintain both cancer and stem cells in undifferentiated state remain unclear. In this study, we carried out gene profilings using oligonucleotide DNA microarray after knocking down the expression of NS in Hela cells. Of the 21,329 genes, 200 genes were found differentially expressed in NS silenced Hela cells with > 2 fold ratio (either > 2 or < 0.5). Category analysis indicated these differential genes were mainly related with cancer pathogenesis, cell death, cell growth and proliferation. NS related gene pathway analysis suggested NS was mostly involved in the networks of cell cycle and differentiation controls. p53 may not be the only partner of NS in its regulated pathways. c-Myc may directly or indirectly interact with it to control the proliferation and differentiation switch in cancer cells. Our study provides a general view of the NS-target genes, and indicates the possible pathways in which NS plays its role in proliferation control.
authors.affiliation: Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China. sjliu@mit.edu
authors.forename: S J
authors.initials: SJ
authors.lastname: Liu
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang
authors.forename: D Q
authors.initials: DQ
authors.lastname: Zhang
authors.forename: X M
authors.initials: XM
authors.lastname: Sui
authors.forename: Y J
authors.initials: YJ
authors.lastname: Liu
authors.forename: Z W
authors.initials: ZW
authors.lastname: Cai
authors.forename: X Y
authors.initials: XY
authors.lastname: Yuan
authors.forename: L Q
authors.initials: LQ
authors.lastname: Sun
authors.forename: G F
authors.initials: GF
authors.lastname: Hu
authors.forename: R L
authors.initials: RL
authors.lastname: Liu
mesh_terms: D002352:Carrier Proteins / Q000235:genetics*; D019204:GTP-Binding Proteins; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006367:HeLa Cells; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D009838:Oligodeoxyribonucleotides; D020411:Oligonucleotide Array Sequence Analysis; D034741:RNA, Small Interfering / Q000235:genetics
chemical_list: D002352:Carrier Proteins; C469949:GNL3 protein, human; D009687:Nuclear Proteins; D009838:Oligodeoxyribonucleotides; D034741:RNA, Small Interfering; D019204:GTP-Binding Proteins