生殖中心的输出是由B细胞中依赖HELLS的DNA甲基化维护维持的
Clara Cousu1, Eléonore Mulot1, Annie De Smet1
1Université Paris Cité, CNRS UMR 8253, INSERM U1151, Institut Necker Enfants Malades, F-75015, Paris, France.
Nature communications
|September 14, 2023
概括
酶,淋巴细胞特异性 (HELLS) 蛋白质对于维持DNA甲基化和幽默免疫是至关重要的. 它的缺乏加速了生殖中心B细胞的衰变,并损害了记忆B细胞的产生.
科学领域:
- 免疫学 免疫学 免疫学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 酶,淋巴细胞特异性 (HELLS) 是一种与DNA甲基化相关的染色质重塑剂.
- 在人类中,HELLS缺乏导致ICF4综合征,一种幽默性免疫缺陷.
- 在适应性免疫力,特别是B细胞反应中HELLS的作用仍然不完全理解.
研究的目的:
- 使用条件淘汰赛小鼠模型,研究HELLS在T-依赖B细胞反应中的功能.
- 阐明HELLS影响生殖中心B细胞动态和抗体生产的分子机制.
主要方法:
- 一个B细胞特异的Hells条件淘汰赛小鼠模型的生成.
- 对生殖中心B细胞生存,分化和DNA甲基化状态的分析.
- 评估记忆B细胞的产生和抗体的产生.
- 野生类型小鼠中DNA甲基转移酶1 (DNMT1) 的药理抑制.
主要成果:
- 希尔斯缺乏导致胚芽中心B细胞死亡的加速.
- 失去HELLS会导致GC B细胞中的DNA低甲基化和逆转移素去抑制.
- 突变B细胞过早地调节记忆B细胞标记物或ATF4,驱动类似于血细胞的代谢程序.
- 产生高亲和度记忆B细胞和循环抗体的受损.
结论:
- 黑尔斯对于有效的依赖T细胞的B细胞反应和长期持续的幽默免疫力至关重要.
- 通过HELLS维护DNA甲基化对于调节生殖中心转录程序至关重要.
- 向DNMT1可以复制HELLS缺陷效应,强调DNA甲基化在适应性免疫中的重要性.
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