mtDNA释放促进了cGAS-STING的激活,并加速了肌肉细胞的衰老
1School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, State Key Laboratory of Advanced Drug Delivery and Release Systems, Key Lab for Rare & Uncommon Diseases of Shandong Province, Jinan, Shandong, China.
Cell death & disease
|July 22, 2024
概括
衰老肌肉中的细胞衰老涉及天生的免疫信号. 这项研究揭示了线粒体DNA释放和VDAC1寡合化激活cGAS-STING,在Zmpste24-/-小鼠中驱动衰老.
科学领域:
- 肌肉生物学 肌肉生物学
- 免疫学 免疫学 免疫学
- 衰老的研究研究.
背景情况:
- 转移后肌肉细胞中细胞衰老的机制尚不清楚.
- cGAS-STING天生的免疫信号与其他细胞类型的衰老有关,但在肌肉细胞中还没有.
研究的目的:
- 为了研究cGAS-STING信号传递在Hutchinson-Gilford进发性综合征 (HGPS) 的小鼠模型中转移后肌肉细胞细胞衰老中的作用.
主要方法:
- 来自Zmpste24-/- 孕症老年小鼠的肌纤维分析.
- 评估与衰老相关的表型,线粒体DNA (mtDNA) 损伤和SASP因子分泌.
- 对线粒细胞衰变,cGAS-STING激活和VDAC1寡合化的研究.
- 使用VBIT4.4进行VDAC1寡合化的药理抑制.
主要成果:
- Zmpste24-/-肌纤维表现出衰老表型,mtDNA损伤增加和SASP因子分泌.
- 在Zmpste24-/-肌纤维中观察到mtDNA释放的增加,髓功能障碍和cGAS-STING激活.
- mtDNA释放与VDAC1寡合化相关,而VBIT4治疗减少了mtDNA释放,cGAS-STING激活和SASP因子表达.
结论:
- 鉴定了一种新的机制,将先天性免疫激活与老化肌肉的转移后肌肉细胞中的细胞衰老联系起来.
- 这一途径涉及mtDNA释放,VDAC1寡合化和cGAS-STING激活.
- 结果可能会为诊断标记和治疗目标提供信息,用于前列腺衰老和与年龄相关的肌肉疾病.
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