通过在体内编程的Treg扩张来服AAV基因治疗的免疫反应
Lavesh Gwalani1, Mincheol Park1, Alexandra B Ysasi1
1Sanofi, Genomic Medicine Unit, Waltham, MA.
Molecular therapy : the journal of the American Society of Gene Therapy
|February 15, 2026
概括
修改后的INTERLEUKIN-2 (IL-2) THOR-834扩展调节性T细胞 (Tregs),以提高腺相关病毒 (AAV) 基因治疗的疗效. 这种新的方法抑制了免疫反应,增强了转基因表达的持久性.
科学领域:
- 免疫学 免疫学 免疫学
- 基因治疗 基因治疗
- 药理学 药理学是指药理学的学科.
背景情况:
- 腺相关病毒 (AAV) 载体对于基因治疗至关重要,但会触发免疫反应,导致转基因表达丧失.
- 细胞毒性T淋巴细胞 (CTL) 和抗体反应降低了AAV载体的疗效和耐用性.
- 调节性T细胞 (Tregs) 可以抑制免疫反应,但目前的方法,如Interleukin-2 (IL-2) 缺乏特异性和寿命.
研究的目的:
- 评估THOR-834,一种新的PEGylated IL-2变体,其扩展Tregs和增强AAV基因治疗的能力.
- 在临床前模型中评估THOR-834的免疫调节作用,包括它对T细胞群和抗体生成的影响.
- 证实THOR-834在非人类灵长类动物中的跨物种疗效,以维持AAV转基因表达.
主要方法:
- 合成PEGylatedIL-2的THOR-834在小鼠,老鼠和Cynomolgus的模型中进行了预防性治疗.
- 通过测量Treg扩张,CD8+效应体记忆T细胞种群和针对AAV囊体和转基因的抗体标位来评估免疫反应.
- 在体内评估了AAV基因转移效率和转基因表达持久性.
主要成果:
- 在小鼠中预防性THOR-834的使用扩大了Tregs,减少了CD8+T细胞,并改善了抗AAV和抗转基因抗体反应.
- 在AAV免疫性小鼠模型中,THOR-834有效抑制了CD8+ T细胞的反应.
- 在Cynomolgus的单剂量THOR-834扩大了Tregs和持续了AAV转基因表达,证明了跨物种的有效性.
结论:
- THOR-834是一种强大的免疫调节剂,可以利用Tregs克服AAV载体的免疫性.
- 这一策略通过抑制有害的免疫反应,显著提高了AAV基因治疗的持续性和有效性.
- THOR-834代表了一种有前途的治疗方法,用于改善基于AAV的基因治疗计划的结果.
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