循环棕化调节TLR9信号传递和小鼠的系统性自身免疫
Hai Ni1,2, Yinuo Wang3,4, Kai Yao2
1Department of Rheumatology and Immunology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
Nature communications
|January 3, 2024
概括
棕基蛋白化酶1 (PPT1) 通过去除S-棕基酶离子S-palmitoylation从Toll-like受体9 (TLR9) 来调节系统性自身免疫. 抑制PPT1可以降低狼模型和患者的自身抗体和炎.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 这是一种自身免疫力.
背景情况:
- 收费类受体9 (TLR9) 识别自我DNA,并与系统性红斑狼 (SLE) 有关.
- 在SLE中控制内体TLR9激活的精确分子机制尚不清楚.
- 了解TLR9调节对于开发有针对性的SLE疗法至关重要.
研究的目的:
- 阐明棕醇蛋白化酶1 (PPT1) 在调节TLR9信号和系统性自身免疫的作用.
- 研究TLR9的翻译后修饰及其对免疫细胞功能的影响.
主要方法:
- 生物化学测定和质谱测试以确定TLR9 S-palmitoylation位点.
- 在SLE (B6.Sle1yaa) 的小鼠模型中,PPT1的遗传缺陷和化学抑制.
- 从小鼠,健康志愿者和用PPT1抑制剂 (HDSF) 治疗的SLE患者的免疫细胞反应 (IFNα,TNF) 的活体分析.
主要成果:
- TLR9在氨酸残留C258和C265中经历S-棕化,由DHHC3和PPT1.1调节.
- 通过PPT1介导的TLR9脱化促进其从UNC93B1释放,影响TLR9的贩运和信号传递.
- 基因或化学抑制PPT1降低了小鼠的抗核抗体水平和炎.
- PPT1 抑制剂 HDSF 降低了血细胞树突细胞 (pDC) 的 IFNα 生产和巨细胞的 TNF 生产.
- 在SLE患者和健康志愿者中,使用HDSF的ex vivo治疗减少了IFNα的产生.
结论:
- PPT1通过控制TLR9的S-palmitoylation状态,充当TLR9内体信号传递的关键调节者.
- 一个TLR9 S-palmitoylation和depalmitoylation的循环控制TLR9的功能和系统性自身免疫.
- 向PPT1代表了治疗SLE和其他自身免疫疾病的潜在治疗策略.
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