刺
细胞凋亡
衰老
细胞生物学
变性(医学)
炎症
医学
椎间盘
内部收益率3
DNA损伤
癌症研究
病理
化学
生物
免疫学
解剖
内科学
DNA
生物化学
先天免疫系统
受体
航空航天工程
工程类
作者
Qiang Guo,Daocheng Zhu,Yihan Wang,Zhimin Miao,Zexin Chen,Zhen Lin,Jiahao Lin,Chongan Huang,ligang Pan,Libo Wang,Shanshan Zeng,Jinwu Wang,Xiangtao Zheng,Yan Lin,Xiaolei Zhang,Yaosen Wu
标识
DOI:10.1016/j.joca.2021.04.017
摘要
Summary
Objective
DNA damage induced by ROS is considered one of the main causes of nucleus pulposus (NP) cells degeneration during the progression of intervertebral disc degeneration (IVDD). cGAS-STING pathway acts as DNA-sensing mechanism for monitoring DNA damage. Recent studies have proved that cGAS-STING contributes to the development of various diseases by inducing inflammation, senescence, and apoptosis. This work explored the role of STING, the main effector of cGAS-STING signaling pathway, in NP degeneration. Method
Immunohistochemistry was conducted to measure STING protein levels in the nucleus pulposus tissues from human and puncture-induced IVDD rat models. TBHP induces degeneration of nucleus pulposus cells in vitro. For in vivo experiments, lv-NC or lv-STING were injected into the central intervertebral disc space. The degeneration level of IVDD was assessed by MRI, X-ray, HE, and Safranin O staining. Results
We found that the expression of STING was upregulated in human and rat degenerated NP tissue as well as in TBHP-treated NP cells. Overexpression of STING promoted the degradation of extracellular matrix; it also promoted apoptosis and senescence of TBHP-treated and untreated NP cells. Knock-down of STING significantly reversed these effects. Mechanistically, STING activated IRF3, whereas blockage of IRF3 attenuated STING-induced apoptosis, senescence and ECM degradation. In vivo experiments revealed that STING knock-down alleviated puncture-induced IVDD development. Conclusion
STING promotes IVDD progress via IRF3, while suppression of STING may be a promising treatment for IVDD.
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