title: [Construction of acid-sensitive potassium channel-3 eukaryotic expression plasmid and its express in SH-SY5Y cells].
abstract: OBJECTIVE
  To construct the acid-sensitive potassium hannel-3(TASK3) eukaryotic expression plasmid and to establish a stable SH-SY5Y cell line expressing enhanced green fluorescent protein (EGFP)-tagged TASK3.
  
  
  METHODS
  TASK3 coding region was subcloned into pEGFP-N1 plasmid to construct a recombinant vector alled pEGFP-TASK3. The correct recombinant expressing plasmid was transfected with X-feet transfection reagent to SH-SY5Y cells. The cell line stably expressiing EGFP tagged-TASK3 gene was established by screening with antibiotic G418 and fluorescence microscope. The expression and localization of the EGFP tagged-TASK3 fusion protein was detected by Western blot and confocal microscope. Exposure of the SH-SY5Y cell line expressing stably TASK3-eGFP fusion proteins was exposed to different pH media (7.0, 6.7, 6.4, 6.1) for 24 h, the cell viability was assessed with cell counting Kit-8 (CCK-8).
  
  
  RESULTS
  All the results of identification by PCR, digestion with restriction endonuclease and sequencing indicated that the recombinant eukaryotic expression plasmid pEGFP-TASK3 was constructed correctly. The stable SH-SY5Y cell line expressing EGFP tagged-TASK3 fusion protein was successfully established. Exposure of the wild type SH-SY5Y cells and the stable SH-SY5Y-GFP tag-TASK3 cell line to different pH media (7.0, 6.7, 6.4, 6.1) for 24 h, the cell viability of two group cells significantly reduced with pH declining, and the difference was statistically significant (P < 0.05). Compared with wild type SH-SY5Y cells, the cell viability of stable SH-SYSY-GFP tag-TASK3 cell line increased significantly with the same pH media, and the difference was statistically significant (P < 0.05).
  
  
  CONCLUSIONS
  The eukaryotic expression vector pEGFP-TASK3 is successfully constructed and the cell line stably expressing TASK3-eGFP fusion is established which is important for their fundamental research and potential applications.
authors.forename: Lin-yu
authors.initials: LY
authors.lastname: Wei
authors.forename: Xin-juan
authors.initials: XJ
authors.lastname: Li
authors.forename: Yi-wen
authors.initials: YW
authors.lastname: Mei
authors.forename: Guo-hong
authors.initials: GH
authors.lastname: Wang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Dong-liang
authors.initials: DL
authors.lastname: Li
authors.forename: Chao-kun
authors.initials: CK
authors.lastname: Li
mesh_terms: D015153:Blotting, Western; D002460:Cell Line; D015870:Gene Expression; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins / Q000235:genetics; D006801:Humans; D010957:Plasmids; D016133:Polymerase Chain Reaction; D024683:Potassium Channels, Tandem Pore Domain / Q000235:genetics*; D014162:Transfection
chemical_list: C498655:KCNK9 protein, human; D024683:Potassium Channels, Tandem Pore Domain; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins