title: [Cloning and eukaryotic expression of murine beta-defensin-2(mBD-2)].
abstract: OBJECTIVE
  To clone murine beta defensin-2 gene (mBD2) and to express the mBD2 protein eukaryotically.
  
  
  METHODS
  Total RNA was isolated from the lungs of BALB/c mice which were injected with LPS in advance. The DNA fragment encoding mBD2 was amplified by RT-PCR and inserted into the plasmid pcDNA3.1(+), which was then digested with EcoR I and Xho I to construct the recombinant plasmid, pcDNA3.1(+)/mBD2. The pcDNA3.1(+)/mBD2 was identified by endonuclease digestion, PCR, and sequencing analysis. The SiHa cells were transfected with pcDNA3.1(+)/mBD2 plasmid and screened by G418 of 100 mg/L over 20 days. Steady expression of mBD2 was confirmed by immunofluorescent staining and RT-PCR.
  
  
  RESULTS
  About 250 bp DNA fragment was amplified by RT-PCR from lung total RNA of the mice injected with LPS. The eukaryotic expression vector, pcDNA3.1(+)/mBD2, was successfully constructed after inserting the mBD2 fragment into pcDNA3.1(+). Most of SiHa cells transfected with pcDNA3.1(+)/mBD2 and screened by G418 could express the mBD2 protein, confirmed by immunofluorescent staining and RT-PCR.
  
  
  CONCLUSIONS
  The eukaryotic vector of pcDNA3.1(+)/mBD2 was successfully constructed and transfected into SiHa cells, which established a solid foundation for further study on the biological characteristics and anti-tumor mechanisms of the mBD2 protein.
authors.affiliation: Department of Microbiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China. xiaoli1909@126.com
authors.forename: Xiao-li
authors.initials: XL
authors.lastname: Wei
authors.forename: Qiao-fa
authors.initials: QF
authors.lastname: Shi
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Wan-yi
authors.initials: WY
authors.lastname: Li
authors.forename: Zhong-hua
authors.initials: ZH
authors.lastname: Jiang
authors.forename: Ming-yuan
authors.initials: MY
authors.lastname: Li
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D003001:Cloning, Molecular; D005057:Eukaryotic Cells; D005822:Genetic Vectors; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D010957:Plasmids; D016133:Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D023083:beta-Defensins / Q000235:genetics*
chemical_list: D023083:beta-Defensins