鼠标T细胞中的OCA-B/Pou2af1表达促进PD-1阻断诱导的自身免疫力,但对于抗瘤免疫力是不可或缺的
bioRxiv : the preprint server for biology
|November 24, 2025
概括
在T细胞中准转录系调节器OCA-B可以预防自身免疫性糖尿病,包括由检查点阻塞疗法诱导的糖尿病. 抑制OCA-B还可以保持抗瘤免疫力,这表明治疗自身免疫的治疗窗口.
科学领域:
- 免疫学 免疫学 免疫学
- 内分泌学 在内分泌学.
- 在瘤学瘤学.
背景情况:
- 转录协调剂OCA-B (八聚体结合转录协活性剂2-B) 涉及T细胞反应和自身免疫.
- 在非肥胖的糖尿病小鼠 (NOD) 中,OCA-B T细胞的缺失减轻了自发的1型糖尿病 (T1D).
- 对OCA-B在检查点封锁引起的糖尿病中的作用及其对抗瘤免疫力的影响仍未得到研究.
研究的目的:
- 在NOD小鼠的α-PD-1抗体诱导糖尿病的背景下,研究OCA-B在T细胞中的作用.
- 确定OCA-B删除在T细胞对PD-1阻断疗法期间抗瘤免疫反应的影响.
- 探索OCA-B作为预防自身免疫和免疫相关不良事件 (irAEs) 的治疗点.
主要方法:
- 在NOD小鼠的T细胞中OCA-B的遗传删除.
- 用α-PD-1抗体治疗小鼠.
- 评估糖尿病发病率,胰岛炎和唾液/眼腺炎症.
- 对CD8+T细胞耗尽标记物的分析 (TPEX和TEX).
- 在各种瘤细胞系模型中评估抗瘤免疫反应.
- 开发和使用针对Oct1/OCA-B转录复合体的小分子抑制剂.
主要成果:
- 针对T细胞的OCA-B删除完全保护8周大的NOD小鼠和部分保护12周大的小鼠免受α-PD-1诱导的糖尿病.
- 在OCA-B被删除的小鼠的唾液和眼腺体中观察到减少透和炎症.
- OCA-B 删除阻断了 CD8+ T 细胞 (TPEX) 的原始细胞分化成 CD8+ T 细胞 (TEX) 的终极分化.
- 在PD-1阻塞治疗后,OCA-B T细胞损失保留了抗瘤免疫反应.
- 服用Oct1/OCA-B抑制剂阻断了用α-PD-1治疗的NOD小鼠的糖尿病出现.
结论:
- 在T细胞中的OCA-B对自发和检查点阻塞诱导的自身免疫糖尿病的发展至关重要.
- 准OCA-B可以预防自身免疫性糖尿病,同时保持抗瘤免疫力,这表明潜在的治疗窗口.
- 在预防自身免疫性疾病和与免疫相关的不良事件方面,OCA-B是一个有前途的治疗标.
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