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CRISPR targeting of mmu-miR-21a through a single adeno-associated virus vector prolongs survival of glioblastoma-bearing mice
Molecular Therapy ( IF 12.1 ) Pub Date : 2024-11-19 , DOI: 10.1016/j.ymthe.2024.11.023
Lisa Nieland, Anne B. Vrijmoet, Isabelle W. Jetten, David Rufino-Ramos, Alexandra J.E.M. de Reus, Koen Breyne, Benjamin P. Kleinstiver, Casey A. Maguire, Marike L.D. Broekman, Xandra O. Breakefield, Erik R. Abels

Glioblastoma (GB), the most aggressive tumor of the central nervous system (CNS), has poor patient outcomes with limited effective treatments available. MicroRNA-21 (miR-21(a)) is a known oncogene, abundantly expressed in many cancer types. miR-21(a) promotes GB progression, and lack of miR-21(a) reduces the tumorigenic potential. Here, we propose a single adeno-associated virus (AAV) vector strategy targeting mmu-miR-21a using the Staphylococcus aureus Cas9 ortholog (SaCas9) guided by a single-guide RNA (sgRNA). Our results demonstrate that AAV8 is a well-suited AAV serotype to express SaCas9-KKH/sgRNA at the tumor site in an orthotopic GB model. The SaCas9-KKH induced a genomic deletion, resulting in lowered mmu-miR-21a levels in the brain, leading to reduced tumor growth and improved overall survival. In this study, we demonstrated that disruption of genomic mmu-miR-21a with a single AAV vector influenced glioma development, resulting in beneficial anti-tumor outcomes in GB-bearing mice.

中文翻译:


通过单个腺相关病毒载体靶向 mmu-miR-21a 的 CRISPR 可延长携带胶质母细胞瘤的小鼠的存活时间



胶质母细胞瘤 (GB) 是中枢神经系统 (CNS) 最具侵袭性的肿瘤,患者预后不佳,可用的有效治疗方法有限。MicroRNA-21 (miR-21(a)) 是一种已知的癌基因,在许多癌症类型中大量表达。miR-21(a) 促进 GB 进展,缺乏 miR-21(a) 降低致瘤潜力。在这里,我们提出了一种靶向 mmu-miR-21a 的腺相关病毒 (AAV) 载体策略,使用由单向导 RNA (sgRNA) 引导的金黄色葡萄球菌 Cas9 直系同源物 (SaCas9)。我们的结果表明,AAV8 是一种非常适合在原位 GB 模型中在肿瘤部位表达 SaCas9-KKH/sgRNA 的 AAV 血清型。SaCas9-KKH 诱导基因组缺失,导致大脑中 mmu-miR-21a 水平降低,导致肿瘤生长减少并提高总生存期。在这项研究中,我们证明了用单个 AAV 载体破坏基因组 mmu-miR-21a 会影响神经胶质瘤的发展,从而在携带 GB 的小鼠中产生有益的抗肿瘤结果。
更新日期:2024-11-19
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