作者:张林 童卫东 刘宝华 李春穴 作者单位:400042 重庆,第三军医大学大坪医院野战外科研究所普通外科 + C. Y# N% J% M; X3 } 9 H3 l; q! X) _2 n n" z9 G ~3 R" q$ R" {# ^
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【摘要】 目的 构建含有人干细胞白血病(stem cell leukemia,SCL)基因的重组腺病毒载体,并观察其对Cajal间质细胞的转染及其介导的SCL基因的表达。为下一步在体转染Cajal间质细胞,观察其对Cajal间质细胞表型逆转的影响奠定基础。方法 利用AdEasy系统、细菌内同源重组法快速构建重组腺病毒AdGFP/SCL。通过观察绿色荧光蛋白的表达评估重组腺病毒对培养的Cajal间质细胞的转染效率。通过RTPCR法分析转染Cajal间质细胞后SCL mRNA的表达。结果 酶切鉴定及PCR结果证明成功构建了含有人SCL基因的重组腺病毒,病毒滴度为1.6×1011 pfu/ml;对Cajal间质细胞的转染率高达100%;RTPCR法检测转染Cajal间质细胞后SCL mRNA有表达。结论 成功构建的含人SCL基因的重组腺病毒对Cajal间质细胞有很强的转染能力,可介导SCL基因在Cajal间质细胞中表达。 + S$ w+ k) E9 t7 a/ B 【关键词】腺病毒载体; 干细胞白血病基因; 同源重组; 转染; Cajal间质细胞- u1 G6 o+ M, F7 q4 A- J
Adenovirus vector mediating SCL gene expression and transfecting Cajal interstitial cells and expression of adenovirus vectorZHANG Lin, TONG Weidong, LIU Baohua, LI Chunxue. Department of General Surgery, Research Institute of Surgery, Daping Hospital, Third Military Medical University, Chongqing 400042, China 0 k0 H+ I: q% l; b" U, N8 { 2 v3 g3 K3 n7 d& QCorresponding author: LIU Baohua, Email: lbh57268@163.com + R. e) M/ [3 z8 L% e( O/ G, h; \0 B7 C0 A
【Abstract】ObjectiveTo construct recombinant adenovirus vector containing human stem cell leukemia (hSCL) gene to observe its ability in transfecting Cajal interstitial cells and mediating SCL gene expression, which may lay basis for further in vivo transfection of Cajal interstitial cells to observe the effect of the recombinant adenovirus vector on changes of monotype of Cajal interstitial cells. MethodsThe recombinant adenovirus AdGFP/SCL was rapidly constructed by using AdEasy system based on the homologous recombination in bacteria. Then, Cajal interstitial cells cultured in vitro were infected with 1.6109 pfu of recombinant adenovirus. The distribution and efficiency of recombinant adenovirus mediated hSCL was observed by expression of green fluorescence protein (GFP) under the fluorescent microscope. The expression of hSCL mRNA transfected with Cajal interstitial cells was measured by RTPCR method. ResultsRestriction endonuclease and PCR analyses confirmed that the hSCL gene was successfully inserted into the adenovirus vector, with titer of the recombinant adenovirus for 1.61011 pfu/ml. The adenovirus had a high transfection efficiency up to 100%. RTPCR analysis showed expression of hSCL mRNA in Cajal interstitial cells transfected by hSCL. ConclusionsThe recombinant adenovirus containing human hSCL gene is successfully constructed by homogenous recombination in bacteria and it has a high transfection efficiency and can mediate expression of Cajal interstitial cells./ \4 \/ i. d5 [
' H! n' U8 {" Z; A# ]9 y【Key words】Adenovirus vector;Stem cell leukemia gene;Homogenous recombination;Transfection;: R0 q8 }$ t! a( z0 Z5 Q+ k
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Cajal interstitial cells , W5 G1 w+ w( i, T! k% ^) J) A8 {! S# s: o, c/ R
干细胞白血病(stem cell leukemia,SCL)基因最早发现于T淋巴细胞急性白血病细胞内,编码一种螺旋环螺旋类转录因子。研究证明SCL是ckit上游的重要调控基因,通过作用于ckit基因启动子调节ckit表达,具有强烈的促ckit表达作用[1]。近期研究表明, 一些外源性因素导致ckit表达下调,引发SCF/ckit通路异常,驱使Cajal间质细胞发生平滑肌细胞样表型转化(而非凋亡),最终导致胃肠动力障碍,可能是慢传输型便秘(slow transit constipation,STC)等众多胃肠动力紊乱性疾病Cajal间质细胞减少的共同机制[2]。为此,本实验拟构建表达人SCL基因的重组腺病毒载体,观察其对Cajal间质细胞的转染及其介导的SCL基因的表达能力。为下一步在体转染Cajal间质细胞,观察其对Cajal间质细胞表型逆转的影响奠定基础。" W G4 p$ `- T+ [
" v2 b& ^$ K7 |( C. w$ M 1材料与方法& ~8 q+ ^- _0 z) R* ^; p
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1.1质粒、菌株、细胞株、实验动物和主要试剂" R1 n& n" ]) q$ B0 k
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含有人SCL cDNA质粒pIRES2EGFP/SCL由本科李春穴博士惠赠,BJ5183菌株、pAdTrackCMV、pAdEasy1由Johns Hopkins大学He TC教授惠赠,pcDNA3.1( )、AdGFP/Wnt由重庆医科大学季业伟博士惠赠,DH5α、Hela以及HEK293细胞株由大坪医院野战外科研究所7室长期保存。Balb/c小鼠,出生后15~20 d内,雌雄不限,清洁级,由大坪医院野战外科研究所动物试验中心提供。各种限制性内切酶、T4DNA连接酶分别购自MBI、Promega公司,脂质体转染试剂LipofectamineTM 2000购自Roche公司,小量质粒DNA提取试剂盒、凝胶回收试剂盒购自Omega公司,RTPCR试剂盒购自TaKaRa公司,PCR引物由上海生物工程有限公司合成。( \8 {; o- o* I" z
2 w6 f h1 W2 @+ }. \1.2重组腺病毒的快速构建" H# O- v; j2 K: m) ~! _- d
8 [* n( D: e& w. S3 W9 r2 \ 【参考文献】9 U: Q( A) J$ p( W. {
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0 U4 @# F' |) {! |$ F6 T( v; k % w1 V W0 ?4 @" B [7] BlumerJensen P, Hunter T. Oncogenic kinase signaling. Nature,2001,411(6835):355-365.作者: 科研人 时间: 2015-7-15 18:55