摘要
目的应用AdEasy-1腺病毒载体系统构建人生长分化因子-5(GDF-5)基因重组腺病毒载体,并在HEK293细胞中扩增制备重组腺病毒。方法将PCR获取的GDF-5基因插入到质粒pMD19-T中,基因测序鉴定后将目的基因克隆至腺病毒穿梭质粒pShuttle-CMV,HindⅢ酶切鉴定。重组质粒经PmeⅠ酶切使之线性化并去磷酸化处理,电转化含腺病毒骨架质粒pAdEasy-1的感受态大肠埃希菌BJ5183,使其在细菌内发生同源重组,卡那霉素筛选,HindⅢ酶切鉴定阳性克隆,扩增重组腺病毒质粒,并转染HEK293细胞,包装成重组腺病毒Ad-GDF-5,分别采用Western blot、TCID50法对Ad-GDF-5进行蛋白鉴定和滴度测定。结果经PCR扩增得到的GDF-5大小约为1.7kb,基因测序结果证实该基因与GENBANK中人GDF-5基因序列相同。pShuttle-CMV-GDF-5、pShuttle-CMV-GDF-5-AdEasy-1经HindⅢ酶切后均得到大小约为1.7kb的片段,与GDF-5大小相符。Western blot证实Ad-GDF-5感染HEK293细胞后大量表达成熟GDF-5蛋白。研究结果表明成功地构建了携带人GDF-5基因的重组腺病毒载体,并制备出5.6×109 PFU/mL的重组腺病毒。结论利用AdEasy-1腺病毒载体系统成功构建了携带人GDF-5基因的重组腺病毒载体,并制备出高滴度值的重组腺病毒Ad-GDF-5,为进一步研究GDF-5的生物学功能及其相关疾病的基因治疗奠定了基础。
Objective To construct the genetic recombinant adenovirus vector carrying the human growth and differentiation fac-tor-5（GDF-5） gene by using AdEasy-1 adenovirus vector system and to amplify and prepare the recombinant adenovirus in HEK 293 cells .Methods Human GDF-5 gene obtained by PCR was inserted into plasmid pMD19-T and the 1 .7 kb GDF-5 cDNA sequence was cloned into the adenoviral shuttle plasmid pShuttle-cytomegalovirus（CMV） of the AdEasy-1 system .It was identified by DNA sequencing and a digestion with Hind Ⅲ restriction enzyme .The resultant pShuttle-CMV-GDF-5 was used to generate the adenovi-ral GDF-5 vector through homologous recombination with the adenoviral backbone plasmid ,pAdEasy-1 in BJ5183 bacterial cells .It was selected by kanamycin and identified by a digestion with Hind Ⅲ restriction enzyme and amplified in XL10-Gold competent bac-teria .The DNA of recombinant adenovirus vector was finally linearized by Pac Ⅰ and the adenoviral recombinants were used to pro-duce adenoviruses in HEK293 packaging cells ,resulting in an Ad-GDF-5 identified by Western blot .The virus titer was assayed by TCID50 .Results GDF-5 cDNA sequence obtained by PCR was 1 .7 kb .Gene sequencing results indicated that the sequence was i-dentical with the one in GENBANK .Cloned sequence 1 .7 kb（GDF-5） was obtained by a digestion with Hind Ⅲ restriction enzyme after GDF-5 cDNA segment was cloned into pShuttle-CMV and AdEasy-1 .Western blot showed that two bands migrating at ap-proximately 15 and 55 kDa were clearly observed in PVDF membrane .These data confirmed that HEK293 cells expressed a large number of mature GDF-5 protein after infected with Ad-GDF-5 .Our research results demonstrated that recombinant adenovirus vector GDF-5 was successfully constructed .The virus titer was 5 .6 ＆#215; 109 PFU/mL .Conclusion Recombinant adenovirus vector carrying the human GDF-5 gene is successfully constructed by using the AdEasy-1 adenovirus vector system .Moreover ,the Ad-GDF-5 with high titer is prepared .These provide the basis for further study of the biological function of GDF-5 and the gene thera-py of its related diseases .
出处
《重庆医学》
CAS
CSCD
北大核心
2014年第12期1412-1415,共4页
Chongqing medicine
基金
国家自然科学基金资助项目(81201407
81171472
81071270
30872614)
四川省杰出青年学科带头人资助计划(09ZQ026-005)
四川省科技支撑计划项目(2010SZ0048)
南充市应用技术研究与开发资金项目(11A0115)
川北医学院科研发展计划项目重点培育项目(CBY11-A-ZP01)
关键词
腺病毒科
生长分化因子-5
基因治疗
adenoviridae
growth and differentiation factor-5
~gene therapy
作者简介
罗栩伟（1985-），住院医师，硕士研究生，主要从事椎间盘退行性变疾病基因治疗的研究工作。
通讯作者，Tel：15881729989；E-mail：lssmdl8@gmail．com。
