人胶质源性神经生长因子真核表达载体构建及在大鼠脊髓组织中的表达

CONSTRUCTION OF EUKARYOTIC EXPRESSION VECTOR FOR HUMAN GLIAL DERIVED NEUROTROPHIC FACTOR AND ITS EXPRESSION IN SPINAL CORD TISSUE OF SD RAT

目的探索人胶质源性神经生长因子(human glial derived neurotrophic factor,hGDNF)真核表达载体,体内直接转染SD大鼠脊髓组织治疗急性脊髓损伤(spinal cord injury,SCI)的可能性。方法基因重组和限制性内切酶酶切构建真核表达载体pcDNA3-hGDNF,经脂质体DOTAP介导质粒转染SD大鼠脊髓组织,作为实验组;对照组大鼠直接注射空载体脂质体混合物。14d后取材,RT-PCR及Western blot检测hGDNF mRNA及蛋白表达。结果重组真核表达载体pcDNA3-hGDNF经限制性内切酶Hind III和Xba-酶切后,电泳显示400bp hGDNF目的片段和5400bp pcDNA3载体片段。转染大鼠脊髓组织后14d,RT-PCR检测出目的基因mRNA,Western blot检测出hGDNF的蛋白表达。结论构建的真核表达载体pcDNA3-hGDNF能在转染的大鼠脊髓组织中表达,可为基因治疗修复急性SCI奠定基础。

Objective To investigate the possibility of constructing eukaryotic expression vector for human glial derived neurotrophic factor （hGDNF）, transfecting it to spinal cord tissue of rats so as to treat acute spinal cord injury. Methods The eukaryotic expression vector pcDNA3-hGDNF was constructed by recombinant DNA technique, transfected into glial cell and neuron of spinal cord by liposome DOTAP as experimental group. In control group, mixture of empty vector and liposome was injected. The mRNA and protein expressions of hGNDF were detected by RT-PCR and Western blot. Results After the recombinant eukaryotic expression vector for hGDNF was digested with Hind III and Xba-I , electrophoresis revealed 400 bp fragment for hGDNF gene and 5 400 bp fragment for pcDNA3 vector. In the transfected spinal cord tissue, the mRNA and protein expressions of hGDNF gene were detected with RT-PCR and Western blot. Conclusion The constructed eukaryotic expression vector pcDNA3-hGDNF could he expressed in the transfected spinal cord tissue of rat, so it provide basis for gene therapy of acute spinal cord injury.