双顺反子慢病毒结构提高膜锚定 HIV 进入抑制剂的表面密度并使修饰细胞获得不依赖嗜性的保护
Bicistronic Lentiviral Architecture Increases Surface Density of Membrane-Associated HIV Entry Inhibitors and Confers Tropism-Independent Protection to Modified Cells
既往研究显示膜锚定的 C 肽能对抗 HIV，其表面表达量决定保护效果。研究者设计了双顺反子（一个载体同时表达两个基因）结构，通过慢病毒载体将糖磷脂酰肌醇锚定的保护性 C 肽递送到原代 CD4 阳性淋巴细胞和造血干细胞。结果显示，双顺反子结构显著提高表面表达水平，可同时表达两种保护肽，并赋予细胞对多种嗜性 HIV 的抵抗能力，在病毒攻击下转导细胞获得选择优势。该结构也适用于造血干细胞转导，为体外基因治疗生成抗 HIV 免疫细胞提供了平台。
为什么推荐给您：提出双顺反子膜锚定抗 HIV 肽的基因工程新平台，体外验证有效，属早期转化进展。
不需要生物学背景，多打比方
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摘要Abstract
Background: Previous studies have demonstrated the efficacy of membrane-anchored C-peptides against HIV and have shown that the surface expression level of these peptides is critical for effective protective activity. Methods: Bicistronic genetic constructs were designed for GPI-anchored expression of protective C-peptides on the cell membrane. The constructs were delivered using lentiviral vectors and tested in primary CD4+ lymphocytes and hematopoietic stem cells. Results: The bicistronic configuration significantly enhanced surface expression levels compared to monocistronic constructs and allowed simultaneous expression of two distinct protective peptides, thereby potentiating their activity. Lentiviral vectors harboring these constructs conferred robust protection to primary CD4+ lymphocytes against HIV infection irrespective of viral tropism and provided a selective advantage to transduced cells upon challenge with replication-competent HIV strains. The bicistronic construct was also suitable for lentiviral transduction of hematopoietic stem cells. Conclusions: These findings establish bicistronic GPI-anchored C-peptide expression as a promising platform for generating HIV-resistant immune cells and highlight its potential for ex vivo gene therapy.