在持久性期间,Toll-like受体9对Chlamydia trachomatis的识别发生了改变
Aissata Diallo1,2, Grace Overman1,2, Prakash Sah1,2
1Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland, USA.
Infection and immunity
|June 20, 2024
概括
甲状腺炎虫的基因组DNA刺激人类的托尔类受体9 (hTLR9) 信号传递,特别是在感染后期阶段. 这表明克拉米迪亚DNA可能会逃脱包含,并达到含有TLR9的真空.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 收费类受体9 (TLR9) 在细菌基因组中识别非甲基化CpGDNA基因.
- 之前的研究表明,人类TLR9 (hTLR9) 基因型变异与克拉米迪亚白虫感染易感性之间存在联系.
- 甲状腺菌在其基因组中具有TLR9刺激的动机.
研究的目的:
- 评估Chlamydia trachomatis基因组DNA (gDNA) 在TLR9.9上的刺激潜力.
- 研究人类 (hTLR9) 和小鼠 (mTLR9) TLR9.9对C. trachomatis gDNA的识别.
- 为了了解TLR9信号传递在活体C. trachomatis感染期间的动态.
主要方法:
- 使用表达hTLR9和mTLR9.9的记者细胞系.
- 通过纯化的C. trachomatis gDNA进行评估TLR9刺激.
- 在各种抑制条件下 (蛋白质合成,脂质糖生物合成) 在活体C. trachomatis感染期间监测TLR9信号.
- 研究了在U937细胞中与TLR9含有真空体共定位C. trachomatis的包容.
主要成果:
- 纯化的C. trachomatis gDNA刺激了hTLR9信号传递,虽然不如其他格兰阴性细菌的gDNA那么强大.
- 活体C. trachomatis感染诱导了htlr9和mtlr9信号,主要是在后来的发育时间点.
- 克拉米迪亚诱导的hTLR9信号通过抑制RB-EB转换前的蛋白质合成而被阻断,并通过抑制脂质糖生物合成而加剧.
- 在诱导的克拉米迪亚异常/持久性期间,信号传输发生了显著的改变.
- 在U937细胞中,C. trachomatis的内含并没有与含有TLR9的真空体共定位.
结论:
- 在发育阶段转换 (RB-to-EB) 期间,以及潜在地在向皮糖的抗生素治疗期间,甲状腺菌的gDNA可能会释放出来.
- 克拉米迪亚的gDNA似乎能够从包含中出来.
- 释放的gDNA通过未知的机制运输到含有TLR9的真空中,从而有助于天生的免疫识别.
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