表观遗传阅读器SP140 功能丧失驱动克罗恩病由于不受控制的巨类拓酶
Hajera Amatullah1, Isabella Fraschilla2, Sreehaas Digumarthi3
1Center for the Study of Inflammatory Bowel Disease, Division of Gastroenterology, Department of Medicine, Massachusetts General Hospital Research Institute, Boston, MA 02114, USA; Harvard Medical School, Boston, MA 02115, USA.
Cell
|August 11, 2022
概括
斑点蛋白140 (SP140) 的损失通过释放拓酶活性来破坏免疫细胞的功能,从而导致免疫疾病. 抑制拓酶 (TOPs) 挽救了这些缺陷,为SP140相关疾病提供了潜在的治疗方法.
科学领域:
- 免疫学
- 表观遗传学
- 分子生物学
背景情况:
- 斑点蛋白140 (SP140) 是一种表观遗传调节剂,与克罗恩病 (CD),多发性硬化症 (MS) 和慢性淋巴细胞白血病 (CLL) 等免疫疾病有关.
- 通过SP140突变导致疾病发病的确切机制在很大程度上是未知的.
研究的目的:
- 阐明SP140在免疫调节中的分子功能.
- 研究SP140在维护色素结构和巨细胞功能的作用.
- 探索针对SP140相关免疫缺陷的治疗策略.
主要方法:
- 全球蛋白质组分析以确定SP140相互作用的蛋白质.
- 使用SP140功能丧失模型 (SP140-/-小鼠) 的体外和体内研究.
- 对巨转录程序的评估,杀死细菌的测定,以及对拓酶的药理抑制 (TOP1/2).
主要成果:
- SP140被确定为拓酶抑制剂 (TOPs),对于保持异性染色素和巨细胞的身份至关重要.
- SP140缺乏导致TOP活性增加,基因表达异常,以及对微生物的巨反应受损.
- 在缺乏SP140的小鼠中,药理抑制TOP1/ 2恢复了正常的巨细胞功能和改善了肠道病理.
- 在SP140-/-小鼠,而不是野生类型的小鼠中,特定的TOP1/2抑制缺陷.
结论:
- SP140 作为一个关键的拓酶抑制剂,保护表观遗传稳定性和免疫细胞功能.
- 失去了SP140的功能释放了TOP活动,导致沉默基因的抑制和免疫功能障碍.
- 向拓酶活性代表了与SP140损失相关的免疫疾病的有前途的治疗方法.
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