Abstract:

To construct the eukaryotic expression vectors of fibroblast growth factor receptor 3(FGFR3)  MSCV/puro-fgfr3-WT and MSCV/puro-fgfr3-DN,and to detect their expressions in human chronic myeloid leukemia(CML) K562 cell line.Methods The full-length FGFR3(fgfr3-WT) and dominant negative FGFR3 (fgfr3-DN)were amplified by polymerase chain reaction (PCR).The two genes were respectively digested with EcoRⅠand BamHⅠ,and then ligated into MSCV/puro to construct the recombinant plasmids MSCV/puro-fgfr3-WT and MSCV/puro-fgfr3-DN  which were tranduced into K562 cells by LipofectaminTM 2000 after PCR,double digestion and DNA sequencing.The expressions of FGFR3 protein in K562 cells were detected by Western blotting and flow cytometry.
Results The recombinant plasmids MSCV/puro-fgfr3-WT and MSCV/puro-fgfr3-DN were amplified by PCR method,and the results showed fgfr3-WT of 2 400 bp and fgfr3-DN of 1 200 bp had been successfully cloned into MSCV-puro vector. The 2 400 bp fragment was oblained after double digestion of recombinant plasmid.The sequencing results showed that the size of fgfr3-WT was 2 400 bp which was the same as the sequence from GeneBank.Fgfr3-DN of 1 200 bp was also in conformity with the expected sequence.Compared　 with control  (K562 MSCV) group,the expression level  of FGFR3-WT  in MSCV/puro-fgfr3-WT transfection (K562-WT) group was increased to above 10 times.There was high expression of FGFR3-DN in MSCV/puro-FGFR3-DN  transfection  (K562-DN) group,but there was no expressions in  control(K562 MSCV) group and  K562-WT  group.The flow cytometry results showed that the  high expressions of FGFR3-WT  were     in  57.5%   cells in K562-DN group and  the  high expressions of FGFR3-DN  were  in  41.5%  cells in K562-DN  group.Conclusion The K562 cell lines highly expressing FGFR3-WT and FGFR3-DN are constructed successfully.

Key words: receptor,fibroblast growth factor,type 3;eukaryotic expression vector, K562 cell line, gene transfection;leukemia,myelomonocytic,chronic