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CCR5 基因编辑的 CD34CD90 造血干细胞群体可作为 HIV 基因治疗的最佳移植物来源。

The CCR5 Gene Edited CD34CD90 Hematopoietic Stem Cell Population Serves as an Optimal Graft Source for HIV Gene Therapy.

机构信息

Centre for Stem Cell Research (CSCR), A Unit of InStem Bengaluru, Vellore, India.

Manipal Academy of Higher Education, Manipal, India.

出版信息

Front Immunol. 2022 Mar 14;13:792684. doi: 10.3389/fimmu.2022.792684. eCollection 2022.

Abstract

Transplantation of allogenic hematopoietic stem and progenitor cells (HSPCs) with C-C chemokine receptor type 5 (CCR5) Δ32 genotype generates HIV-1 resistant immune cells. CCR5 gene edited autologous HSPCs can be a potential alternative to hematopoietic stem cell transplantation (HSCT) from HLA-matched CCR5 null donor. However, the clinical application of gene edited autologous HSPCs is critically limited by the quality of the graft, as HIV also infects the HSPCs. In this study, by using mobilized HSPCs from healthy donors, we show that the CD34CD90 hematopoietic stem cells (HSCs) express 7-fold lower CD4/CCR5 HIV receptors, higher levels of SAMHD1 anti-viral restriction factor, and possess lower susceptibility to HIV infection than the CD34CD90 hematopoietic progenitor cells. Further, the treatment with small molecule cocktail of Resveratrol, UM729 and SR1(RUS) improved the engraftment potential of CD34CD90 HSCs. To demonstrate that CD34CD90 HSC population as an ideal graft for HIV gene therapy, we sort purified CD34CD90 HSCs, treated with RUS and then gene edited the with single sgRNA. On transplantation, 100,000 CD34CD90 HSCs were sufficient for long-term repopulation of the entire bone marrow of NBSGW mice. Importantly, the gene editing efficiency of ~90% in the infused product was maintained , facilitating the generation of CCR5 null immune cells, resistant to HIV infection. Altogether, CCR5 gene editing of CD34CD90 HSCs provide an ideal gene manipulation strategy for autologous HSCT based gene therapy for HIV infection.

摘要

异体造血干细胞和祖细胞(HSPCs)与 C-C 趋化因子受体 5(CCR5)Δ32 基因型的移植会产生抗 HIV-1 的免疫细胞。经过 CCR5 基因编辑的自体 HSPCs 可以作为来自 HLA 匹配的 CCR5 缺失供体的造血干细胞移植(HSCT)的潜在替代方法。然而,由于 HIV 也会感染 HSPCs,因此基因编辑的自体 HSPCs 的临床应用受到移植物质量的严重限制。在这项研究中,我们使用来自健康供体的动员 HSPCs 表明,CD34CD90 造血干细胞(HSCs)表达的 CD4/CCR5 HIV 受体低 7 倍,具有更高水平的 SAMHD1 抗病毒限制因子,并且对 HIV 感染的敏感性低于 CD34CD90 造血祖细胞。此外,用白藜芦醇、UM729 和 SR1(RUS)的小分子鸡尾酒处理可提高 CD34CD90 HSCs 的植入潜力。为了证明 CD34CD90 HSC 群体是 HIV 基因治疗的理想移植物,我们分选纯化 CD34CD90 HSCs,用 RUS 处理,然后用单 sgRNA 进行基因编辑。在移植时,输注 10 万个 CD34CD90 HSCs 足以长期重建 NBSGW 小鼠的整个骨髓。重要的是,输注产品中的基因编辑效率保持在~90%,有助于产生对 HIV 感染具有抗性的 CCR5 缺失免疫细胞。总之,对 CD34CD90 HSCs 的 CCR5 基因编辑为基于自体 HSCT 的 HIV 感染基因治疗提供了理想的基因操作策略。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672a/8963924/f0f663ab5669/fimmu-13-792684-g001.jpg

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