分泌的线粒体阿斯巴丁-tRNA合成酶 (DARS2) 调节TNFα信号传递
Benjamin S Johnson1, Alex Cornwell1, Daniela Farkas1
1Department of Internal Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, USA.
Physiological reports
|November 11, 2025
概括
线粒体阿斯巴丁-tRNA合成酶 (DARS2) 在TNFα刺激后从呼吸道细胞分泌出来. 这种释放的DARS2在巨细胞中诱导一种类似M1的表型,突出显示了一种新的膜信号通路.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 氨基酸-tRNA合成酶 (aaRS) 调节细胞因子信号传递.
- 细胞质aaRS成员被分泌以调节反应.
- 线粒体aaRS释放及其在膜信号传递中的作用在很大程度上仍未被描述.
研究的目的:
- 为了研究线粒体阿斯巴提尔-tRNA合成酶 (DARS2) 从呼吸道上皮质释放的过程.
- 确定分泌DARS2在巨细胞激活中的作用.
- 为了阐明控制DARS2分泌的分子通路.
主要方法:
- 利用BEAS-2B细胞研究DARS2释放,以应对TNFα等细胞因子.
- 采用采用媒介转移来评估DARS2对THP1细胞的膜信号效应.
- 使用阻断抗体,化学抑制剂和siRNA来识别分泌途径.
主要成果:
- 鉴定DARS2是第一个因TNFα.反应而从呼吸道上皮质释放的线粒体aaRS.
- 证明分泌的DARS2与巨细胞结合,被内化,并诱导一种类似M1的表型.
- 显示的DARS2释放部分依赖于TNFα-受体1并需要内体的分类复合体进行细胞外运输.
结论:
- DARS2是一种新型分泌的线粒体蛋白质,参与细胞间通信.
- 来自呼吸道细胞的TNFα诱导的DARS2分泌会影响巨细胞的两极分化.
- 这一途径代表了免疫调节和炎症的新机制.
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