Summary

瞬时转染293T细胞复制缺陷型逆转录病毒生产

Published: December 04, 2007
doi:

Summary

这种技术演示了一个有效的方式来准备复制缺陷型逆转录病毒编码的人类癌基因的股票,随后诱导骨髓增殖性疾病的小鼠模型中使用。

Abstract

我们的实验室研究人类Bcr – Abl的或生长因子受体产生的致癌基因(ZNF198 – FGFR1的,BCR -PDGFRα等)等癌基因诱导骨髓增生性疾病。我们能够在我们的小鼠模型,以模型和研究一个与人类类似的的疾病,以前与利益表达的原癌基因的逆转录病毒感染的骨髓细胞移植。复制缺陷的逆转录病毒编码的人类癌基因和标记(GFP,RFP,耐抗生素基因等)是产生一个瞬时转染293T细胞,腺病毒E1A基因产品转化一个人的肾上皮细胞系的协议。 293细胞有高度磷酸三钙(投诉警察课4)转染不同寻常的特性,容易达到50-80%的转染效率。在这里,我们共同利益和质粒表达GAG – POL – ENV包装的功能,如包装构造吉或PCL,在这种情况下的单基因质粒EcoPak,的原癌基因表达逆转录病毒载体转染293细胞。最初的转染,进一步提高使用氯喹。 ecotropic病毒的股票,收集培养上清48小时。转染后,可以储存在-80 ° C和用于感染细胞系,改造和体外研究,或小鼠骨髓细胞如原代细胞,在我们的小鼠模型,然后可以用于移植。

Protocol

改造,板3 – 5X10 6细胞/ 6厘米的组织cultureplate 293T细胞前的晚上。 注:我们使用易于转染和efficacyas病毒产生细胞的293T细胞 。 这些细胞是缺乏包装病毒的,除非引入一个辅助质粒。 第一天上午,轻轻取出介质替换为4毫升293T细胞MED含有氯喹25毫米。培养箱中培养1小时。 注:板应在80%左右融合。 同时,病毒混合2板准备的?…

Discussion

四个关键点,将保证一个良好的病毒股票的成功:

  1. 生产的293T细胞很健康,这意味着他们已经非常有规律的时间表上的分裂,从来没有杂草丛生,并在组织培养板,每6厘米的3.5-5万的优化密度镀,使他们达到一个密度80%的板转染上午。
  2. 此外氯喹,提高转染效率和随后的病毒滴度,约3 – 5倍,稳定细胞lysozomes和增加到达细胞核内的DNA的一小部分。丁酸钠(另一种溶酶体稳定)也被用于这一…

Materials

Material Name Type Company Catalogue Number Comment
293T cells cell-line     Split 1:3 to 1:4 every 3 days, otherwise they will tend to clump with replating and will not transfect as well.
293T cell medium       DMEM/hi-glu + 10 % FBS + 1% Pen/Strep + 1% L-Glutamine (1% NEAA, optional). We obtain our tissue culture slutions from CellGro.
coding DNA plasmid       Twice purified by CsCl. MSCV backbone, encoding oncogene and marker of choice (Neo, GFP, etc.)
EcoPak       also called pMCV-Ecopac: ecotropic packaging plasmid, encoding gag-pol-env
2x HBS       For 500 ml: 8.0 g NaCl + 0.37 g KCl + 106.5 mg Na2HPO4 (anhydrous; 201.1 mg if 7xH2O) + 1.0 g dextrose (D-glucose) + 5.0 g HEPES powder. Dissolve in 450 ml dH2O (milli-Q), adjust pH to 7.05 with NaOH, then complete to 500 ml with dH2O. Sterile filter thru 0.45 µ filter. Store at room temperature, with the cap on tight.
2M CaCl2   Sigma    
miliQ H2O       sterile-filtered
Chloroquine       1000x stock is 25 mM in PBS- (w/o Ca2+/Mg2+), stored at -20C. Add fresh to the medium when needed.
6 cm plates       for tissue culture
Incubator       for tissue culture. Set at 37C, 10% CO2.
10 cc sterile syringes       Sterile. One per virus type.
18G needles       single use, one per virus type.
45 um syringe filters        
5 ml plastic tubes       Sterile, to mix transfection solution, for up to 2 plates at a time (2 ml). We use Falcon tubes.
50 ml conical tubes        
cryovials       2 and 4 ml, for virus aliquots.

All reagents used in the transfection must be sterile-filtered (CaCl2, 2x HBS, miliQ H2O) and kept sterile.

References

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Citer Cet Article
Gavrilescu, L. C., Van Etten, R. A. Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells. J. Vis. Exp. (10), e550, doi:10.3791/550 (2007).

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