title: Expression of rat oligodendrocyte transcription factor 2 in COS-7 cells following its eukaryotic expression vector construction.
abstract: OBJECTIVE
  The basic HLH transcription factor Olig is a key regulator for differentiating the oligodendrocyte lineage cells during development. Oligodendrocyte transcription factor 2 (Olig2) plays a crucial role in differentiating the oligodendrocytes in the spinal cord. We aimed to construct and investigate the eukaryotic expression recombinant plasmid in the rat Olig2.
  The experiment was performed at the Laboratory of Neurobiology, Xuzhou Medical College from October 2011 to March 2012.
  
  
  METHODS
  The pEGFP-N1 vector was purchased from Invitrogen. JM101 competent cells and COS-7 cells were preserved at the Laboratory of Neurobiology, Xuzhou Medical College, China. The Olig2 cDNA fragment was cloned by RT-PCR with the total RNA from the neonatal rat spinal cord, and subsequently cloned into pGEM-T vector. The confirmed Olig2 fragment was then cloned into the pEGFP-N1 vector. The right recombinant was transfected into COS-7 cells by lipofectamine 2000. The expression of the Olig2 in COS-7 cells was detected by RT-PCR and immunoblot analysis. Enzyme digestion and sequencing of the recombinant plasmid; and expression of the Olig2 were analyzed by fluorescence microscope and western blot.
  
  
  RESULTS
  The correct pEGFP-N1-Olig2 cloning was verified by restriction endonuclease digestion and sequencing. The western blot analysis indicated that the Olig2-GFP fusion protein was expressed in the COS-7/pEGFP-N1-Olig2 cells at 72 h.
  
  
  CONCLUSIONS
  The pEGFP-N1-Olig2 vector was constructed successfully. The Olig2-GFP fusion protein was expressed in the COS-7/pEGFP-N1-Olig2 cells. This study lays the foundation for further research in gene therapy for central nervous system demyelinating diseases.
authors.affiliation: Department of Human Anatomy, Xuzhou Medical College, Xuzhou, China. xhs51@126.com.
authors.forename: D-W
authors.initials: DW
authors.lastname: Qu
authors.forename: X-J
authors.initials: XJ
authors.lastname: Han
authors.forename: Y-L
authors.initials: YL
authors.lastname: Wang
authors.forename: H-S
authors.initials: HS
authors.lastname: Xu
mesh_terms: D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics* / Q000378:metabolism; D019556:COS Cells; D002522:Chlorocebus aethiops; D018076:DNA, Complementary / Q000235:genetics; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins; D008055:Lipids; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D000076104:Oligodendrocyte Transcription Factor 2; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D018076:DNA, Complementary; D049452:Green Fluorescent Proteins; D008055:Lipids; D009419:Nerve Tissue Proteins; D000076104:Oligodendrocyte Transcription Factor 2; C086724:Lipofectamine; C522729:Olig2 protein, rat; C485184:enhanced green fluorescent protein