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自噬激活通过 IL-13 和 JAK1/STAT1 通路抑制中重度创伤性脑损伤小鼠模型中的细胞焦亡。

Autophagy Activation Represses Pyroptosis through the IL-13 and JAK1/STAT1 Pathways in a Mouse Model of Moderate Traumatic Brain Injury.

机构信息

Department of Forensic Medicine, Medical School of Soochow University, 178 East Ganjiang Road, Suzhou 215213, China.

出版信息

ACS Chem Neurosci. 2020 Dec 16;11(24):4231-4239. doi: 10.1021/acschemneuro.0c00517. Epub 2020 Nov 10.

Abstract

The newly highlighted research into programmed cell death (PCD), autophagy dependent cell death and pyroptotic cell death, has shown that these processes are both strongly correlated with the pathological progression of traumatic brain injury (TBI). However, their cross-talk in TBI remains unclear. Here, a moderate TBI model was established to explore the relationship between autophagy and pyroptosis. Rapamycin was used to activate the process of autophagy, which was impaired in the moderate TBI model, and this treatment reversed the expression of pyroptosis associated proteins, interleukin-13 (IL-13) and the pJAK-1 pathway, which were upregulated significantly after TBI. The level of IL-13 was downregulated, and the JAK-1 pathway was blocked to reveal the molecular mechanisms by which autophagy inhibits pyroptosis; these two treatments reduced the expression levels of pyroptosis associated proteins. In addition, these three interventions reduced the formation of neuronal NLRP3, the extent of brain edema, and the degree of cortical neuron degeneration. Furthermore, the deficit in motor function post-TBI was also markedly alleviated. Collectively, our results demonstrated that autophagy activation exerts a neuroprotective effect by inhibiting pyroptotic cell death in the moderate TBI model, and the inhibitory effect was dependent on the downregulation of IL-13 and repression of the JAK-1-STAT-1 signaling pathway.

摘要

新凸显的细胞程序性死亡(PCD)、自噬依赖性细胞死亡和细胞焦亡研究表明,这些过程均与创伤性脑损伤(TBI)的病理进展密切相关。然而,它们在 TBI 中的相互作用尚不清楚。本研究构建了中度 TBI 模型以探索自噬与细胞焦亡之间的关系。使用雷帕霉素激活中度 TBI 模型中受损的自噬过程,该处理可逆转细胞焦亡相关蛋白白细胞介素-1β(IL-1β)和 pJAK-1 通路的表达,TBI 后这些蛋白表达显著上调。IL-1β水平下调,JAK-1 通路被阻断,揭示了自噬抑制细胞焦亡的分子机制;两种处理均降低了细胞焦亡相关蛋白的表达水平。此外,这三种干预措施降低了神经元 NLRP3 的形成、脑水肿的程度和皮质神经元变性的程度。此外,TBI 后运动功能的缺陷也明显减轻。总之,我们的研究结果表明,自噬激活通过抑制中度 TBI 模型中的细胞焦亡发挥神经保护作用,这种抑制作用依赖于 IL-1β的下调和 JAK-1-STAT-1 信号通路的抑制。

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