在人类呼吸道光滑肌细胞中,TNFα诱导的线粒体分裂背后的分子机制
Debanjali Dasgupta1, Sanjana Mahadev Bhat1, Claire Creighton1
1Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, United States.
American journal of physiology. Lung cellular and molecular physiology
|December 12, 2023
概括
瘤亡因子α (TNFα) 诱导呼吸道光滑肌细胞内质网膜应激,导致线粒体分裂. 这一途径涉及pIRE1α/XBP1s激活CDK1/5,后者酸化DRP1,导致碎片化.
科学领域:
- 细胞生物学 细胞生物学
- 炎症的分子机制.
- 呼吸系统药物 呼吸系统药物
背景情况:
- 瘤亡因子α (TNFα) 是一种促炎性细胞因子,与急性炎症有关.
- 在人体呼吸道平滑肌肉 (hASM) 细胞中,TNFα通过与胺相关的蛋白1 (DRP1) 酸化诱导线粒体分裂.
- 此外,TNFα还触发了内质网膜 (ER) 的压力,涉及需要内醇的酶1α (IRE1α) /X-box结合蛋白1 (XBP1) 途径.
研究的目的:
- 研究将TNFα诱导的ER压力与hASM细胞中的线粒体分裂联系在一起的分子机制.
- 为了确定pIRE1α/XBP1s通路是否通过转录升高调节负责DRP1酸化的激酶.
主要方法:
- 3D共聚焦成像用于评估线粒体碎片化.
- 西方涂抹和拼接测试以确认ER应激通路的激活.
- 在分析和ChIP测试中,确定XBP1s的转录标 (CDK1,CDK5).
主要成果:
- TNFα治疗诱导了线粒体分裂,并激活了hASM细胞中的pIRE1α/XBP1s通路.
- XBP1s直接针对CDK1和CDK5的促进区域.
- TNFα增加了XBP1s与CDK1/5促进体的结合,导致pDRP1S616和线粒体分裂的增加.
结论:
- 在hASM细胞中,TNFα通过ER压力依赖途径诱导线粒体分裂.
- 皮尔1αS724/XBP1s通路对CDK1和CDK5进行上调,这些CDK1和CDK5在S616.1上酸化DRP1.
- 这种机制揭示了ER压力与呼吸道炎症中的线粒体动力学之间的新联系.
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