Combination gene therapy for HIV using a conditional suicidal gene with CCR5 knockout.

Combination gene therapy for HIV using a conditional suicidal gene with CCR5 knockout.
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DOI:
10.1186/s12985-021-01501-7
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发表时间:
2021-01-30
期刊:
影响因子:
4.8
通讯作者:
Joshi A
Joshi A
中科院分区:
医学3区
文献类型:
--
作者:
Mehmetoglu-Gurbuz T;Yeh R;Garg H;Joshi A

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使用造血干细胞产生抗HIV免疫系统的基因治疗方法已被证明是成功的。删除HIV共受体CCR 5仍然是一个可行的策略,尽管共受体转换为CXCR 4仍然是一个主要的陷阱。为了克服这一点,我们设计了一种双基因治疗策略,该策略结合了条件性自杀基因和CCR 5敲除(KO),以克服单独CCR 5 KO的局限性。设计了双载体系统,其中包括表达HIV达特依赖性胸苷激酶突变体SR 39(TK-SR 39)和GFP报告基因的整合慢病毒载体。第二非整合慢病毒(NIL)载体表达CCR 5gRNA-CRISPR/Cas9盒和HIV达特蛋白。依次转导细胞,然后整合NIL载体,允许插入条件性自杀基因、CCR 5的KO和GFP的瞬时表达以富集修饰的细胞。我们使用这种策略来修饰TZM细胞并产生对CCR 5嗜性病毒具有抗性同时允许CXCR 4嗜性病毒感染的细胞系,所述CXCR 4嗜性病毒可以通过用更昔洛韦处理来控制。我们的研究证明了HIV的联合基因治疗是一种可行的策略,可以克服单独编辑CCR 5基因的局限性。
Gene therapy approaches using hematopoietic stem cells to generate an HIV resistant immune system have been shown to be successful. The deletion of HIV co-receptor CCR5 remains a viable strategy although co-receptor switching to CXCR4 remains a major pitfall. To overcome this, we designed a dual gene therapy strategy that incorporates a conditional suicide gene and CCR5 knockout (KO) to overcome the limitations of CCR5 KO alone. A two-vector system was designed that included an integrating lentiviral vector that expresses a HIV Tat dependent Thymidine Kinase mutant SR39 (TK-SR39) and GFP reporter gene. The second non-integrating lentiviral (NIL) vector expresses a CCR5gRNA-CRISPR/Cas9 cassette and HIV Tat protein. Transduction of cells sequentially with the integrating followed by the NIL vector allows for insertion of the conditional suicide gene, KO of CCR5 and transient expression of GFP to enrich the modified cells. We used this strategy to modify TZM cells and generate a cell line that was resistant to CCR5 tropic viruses while permitting infection of CXCR4 tropic viruses which could be controlled via treatment with Ganciclovir. Our study demonstrates proof of principle that a combination gene therapy for HIV is a viable strategy and can overcome the limitation of editing CCR5 gene alone.
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