DNASE1L3对不同哺乳动物细胞表面的线粒体DNA进行了调查
Jennifer Porat1, Valentina Poli2, Karim Almahayni3,4
1Stem Cell and Regenerative Biology Program, Division of Hematology/Oncology, Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
氧化线粒体DNA通过蛋白质和蛋白质糖体与哺乳动物细胞表面结合. 这种细胞表面DNA与自身免疫性疾病风险有关,这表明了新的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 细胞外环境在免疫反应中发挥着至关重要的作用,通过区分自我与非自我核酸.
- 细胞表面相互作用对于启动信号级联来传递关于细胞外核酸的信息至关重要.
研究的目的:
- 研究哺乳动物细胞表面上的细胞外DNA的存在和特征.
- 在自身免疫性疾病的背景下探索细胞表面DNA的作用.
主要方法:
- 利用技术识别和描述与哺乳动物细胞表面连接的DNA,包括氧化线粒体DNA.
- 研究了细胞表面DNA与细胞表面蛋白质和肝硫酸盐蛋白质糖的关联.
- 分析了DNA积累模式,并与RNA结合蛋白重叠.
- 评估了人类和小鼠B细胞中核酶DNASE1L3对细胞表面DNA的清除.
- 检查了与自身免疫性疾病相关的DNASE1L3变异患者的表面DNA水平.
主要成果:
- 氧化线粒体DNA通过细胞表面蛋白和肝硫酸盐蛋白质糖连接到选择哺乳动物细胞表面.
- 细胞表面的DNA形成大集群,部分与RNA结合蛋白域重叠.
- 人类和小鼠B细胞表面含有DNA,可以通过分泌的核酶DNASE1L3.3.消除.
- 患有DNASE1L3误解变异的患者,与更高的自身免疫性疾病风险相关,在B细胞和T细胞上表层DNA的水平升高.
结论:
- 这项研究扩大了对细胞表面核酸生物学的理解.
- 在细胞表面分子,DNA向和自身免疫性疾病之间建立了机械联系.
- 细胞表面DNA的积累,特别是在DNASE1L3功能障碍的背景下,代表了自身免疫病原发生的潜在因素.
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