慢病毒包装、纯化、滴度测定及感染
慢病毒包装、纯化、滴度测定及感染 一、 包装
1. 包装细胞
Lenti-X? Lentiviral Expression Systems User Manual.pdf(P11); Lenti-X? shRNA Expression Systems User Manual.pdf(P16)
2. 病毒载体及包装质粒
病毒载体:DNA组构建及中量提取;
包装质粒:商品化产品(Lenti-X? Lentiviral Expression Systems User
Manual.pdf(P12); Lenti-X? shRNA Expression Systems User
Manual.pdf(P17))或DNA中量提取(目前唯一使用来源);
3. 细胞转染
方法一:
); Lenti-X? Lentiviral Expression Systems User Manual.pdf(P12Lenti-X? shRNA Expression Systems User Manual.pdf(P17); 方法二:
按照Lipofectamine? LTX & Plus Reagent (Cat.No.15338,invitrogen)进行,简要中文说明如下:
6a. 转染前24小时,把4–5 x 10个293T细胞传代至10cm培养皿中,加入完全培养基至终体积10ml,培养过夜,转染时,细胞密度为80–90%;
b. 293T细胞转染前2小时换上9ml新鲜的完全培养基;
c. 用之前充分混匀PLUS Reagent,在EP管中加入15ug的DNA混合物
(pLVX-shRNA Plasmid DNA:pMDLg:pRes-Rev:pCMV-VSV-G 的摩尔比
为1:1:1:1),15ul的PLUS Reagent,用Opti-MEM定容到500ul,标记为
Tube 1,温和混匀,室温孵育5分钟;
d. 充分混匀Mix Lipofectamine LTX,在EP管中加入45ul的Mix Lipofectamine
LTX和455ul的Opti-MEM,标记为Tube 2,温和混匀;
e. 将Tube 1的溶液加到Tube 2中,温和混匀,室温孵育5分钟; Tube 1 (Plasmid DNA) Tube 2 (LTX)
455 µl Opti-MEM 15ug DNA MIX(pLVX-shRNA Plasmid DNA:
pMDLg:pRes-Rev:pCMV-VSV-G=1:1:1:1)
15 µl PLUS Reagent 45 µl Mix Lipofectamine LTX
Up to 500µl Opti-MEM 500 µl Total Volume
500 µl Total Volume
f. 将1 ml 转染复合物逐滴加入前一天种好细胞的100mm皿中,边加边摇匀。
g. 将细胞放入置于37 ?、5 %CO2 培养箱中培养,12小时后换上新鲜的培
养基继续培养。
h. 转染后48-72h,收取培养上清,500g离心10min或利用0.45 μm 低蛋白
吸附滤膜去除细胞碎片和团聚的病毒;
方法三:
C0508磷酸钙法细胞转染试剂盒.pdf(目前唯一使用方法)
4. 病毒上清收集
转染后12h, 48h,72h分别收集一次;
二、 纯化
方法一:
(i) 病毒上清(接一、包装 4.病毒收集).
(ii) Add 51 ml of a 50% PEG 6000 solution.
(iii) Add 21.7 ml of a 4 M NaCl stock solution.
(iv) Add 23.3 ml of PBS. This will result in a final volume of 300 ml. The final PEG
6000 concentration will be 8.5% and the
final NaCl concentration will be B0.3 M.
(v) Distribute the sample as 150-ml aliquots in two 250-ml polypropylene wide-mouthed bottles.
(vi) Store the bottles at 4 1C for 1.5 h. Mix contents every 20–30 min.
(vii) Centrifuge bottles at 7,000g for 10 min at 4 1C using a Beckman fixed-angel
JLA-10.500 rotor.
(viii) After centrifugation, a white pellet should be visible. (ix) Carefully decant the supernatant and add 1.2 ml of 50 mM Tris-HCl, pH 7.4, per
bottle. Resuspend the pellets by vigorously pipetting liquid up and down. (x) Vortex the bottles vigorously for 20–30 s to further resuspend the pellets.
(xi) Transfer the vector suspension into screw-cap microfuge tubes in aliquots of 100
ml.
。(xii) Snap-freeze the tubes in crushed dry ice and store at -80 C.
a. 把去除细胞碎片和团聚的病毒上清转移至离心管,按照10ml的病毒上清加入2.5ml的50%PEG6000混合;
b. 加入1.064ml的4M的NaCl混匀;
c. 加入1.142ml的PBS混匀;
d. 4?C下,孵育1.5h,每20-30min颠倒混匀;
e. 4?C下,7000g离心10min。
f.小心移除上清,切勿触动白色沉淀,如果白色沉淀出现松动,可以在7000 g下短暂离心;
g. 加入原病毒上清1/200 to 1/100 体积的PBS重悬沉淀病毒粒子; h. 立即对浓缩纯化的病毒粒子进行滴度测定,并分装后(50-100ul/管)冻存于-80?C超低温冰箱中;
上述所需试剂配制方法见Production, concentration and titration of pseudotyped
HIV-1-based lentiviral vectors.pdf(P3)
方法二:
Lenti-X? Concentrator.pdf
三、 滴度测定
病毒滴度测定-针对有绿色荧光蛋白标记的病毒.doc;
病毒滴度测定-针对没有绿色荧光蛋白标记的病毒.doc;
四、 感染
Lenti-X? Lentiviral Expression Systems User Manual.pdf(P16); Lenti-X? shRNA Expression Systems User Manual.pdf(P20);
Lenti-X? Concentrator.pdf(病毒感染增强剂使用说明);
a. 感染前24小时,把细胞传代至35 mm平皿中,加入完全培养基至终体积
3ml,培养过夜,感染时,细胞密度为80–90%;
b. 把冻存于-80?C的病毒取出并在室温下冻融;
c. 用新的完全培养基更换培养液,并加入冻融的病毒粒子(MOI为5-10)和polybrene(4 μg/ml),培养液终体积为3ml;
d. 感染8-24h后,用新3-4ml新完全培养基更换感染培养液; e. 感染48小时后收取细胞进行QPCR检测,感染72小时后收取细胞进行WB检测;