title: Silencing of TonEBP/NFAT5 transcriptional activator by RNA interference.
abstract: TonEBP is a transcriptional activator that is expressed throughout development in many tissues and cell types. In the kidney medulla, TonEBP appears to be an important local regulator of differentiation by virtue of stimulating several genes. To study the function of TonEBP, two small interfering RNA (siRNA) duplexes were developed that reduced TonEBP expression effectively via RNA interference. The silencing lasted only 3 d after introduction of the TonEBP-siRNA's. As expected, TonEBP-driven reporter gene expression and expression of the sodium/myo-inositol cotransproter (SMIT), aldose reductase (AR) and heat shock protein 70 (HSP70) mRNA were significantly decreased in cells where TonEBP expression was silenced. These data provide direct evidence that the SMIT, AR, and HSP70 genes are targets of TonEBP, although the potential role of other proteins, such as accessory proteins, cannot be excluded. The TonEBP-siRNA is an effective tool that should prove useful in the investigation of loss-of-function relationship in cells.
authors.affiliation: Division of Nephrology, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Ki Young
authors.initials: KY
authors.lastname: Na
authors.forename: Seung Kyoon
authors.initials: SK
authors.lastname: Woo
authors.forename: Sang Do
authors.initials: SD
authors.lastname: Lee
authors.forename: H Moo
authors.initials: HM
authors.lastname: Kwon
mesh_terms: D000449:Aldehyde Reductase / Q000235:genetics; D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D005786:Gene Expression Regulation; D020868:Gene Silencing; D018390:Gene Targeting; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics; D006367:HeLa Cells; D006360:Heat-Shock Proteins / Q000235:genetics; D006801:Humans; D008565:Membrane Proteins; D008969:Molecular Sequence Data; D050778:NFATC Transcription Factors; D009687:Nuclear Proteins; D034622:RNA Interference / Q000502:physiology*; D012333:RNA, Messenger / Q000037:antagonists & inhibitors; D034741:RNA, Small Interfering / Q000235:genetics; D027981:Symporters / Q000235:genetics; D015534:Trans-Activators / Q000235:genetics* / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic / Q000502:physiology; D015533:Transcriptional Activation / Q000502:physiology*
chemical_list: D004268:DNA-Binding Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D008565:Membrane Proteins; C118125:NFAT5 protein, human; D050778:NFATC Transcription Factors; D009687:Nuclear Proteins; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D027981:Symporters; D015534:Trans-Activators; D014157:Transcription Factors; C073884:SLC5A3 protein, human; D000449:Aldehyde Reductase