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慢性病毒感染中通过mTOR、SPP1/OPN和炎性小体途径信号传导的小胶质细胞-神经元相互作用。

Microglial- neuronal crosstalk in chronic viral infection through mTOR, SPP1/OPN and inflammasome pathway signaling.

作者信息

Argandona Lopez Catalina, Brown Amanda M

机构信息

Division of Neuroimmunology, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.

Division of Neuroimmunology, Department of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, United States.

出版信息

Front Immunol. 2024 Apr 5;15:1368465. doi: 10.3389/fimmu.2024.1368465. eCollection 2024.

Abstract

HIV-infection of microglia and macrophages (MMs) induces neuronal injury and chronic release of inflammatory stimuli through direct and indirect molecular pathways. A large percentage of people with HIV-associated neurologic and psychiatric co-morbidities have high levels of circulating inflammatory molecules. Microglia, given their susceptibility to HIV infection and long-lived nature, are reservoirs for persistent infection. MMs and neurons possess the molecular machinery to detect pathogen nucleic acids and proteins to activate innate immune signals. Full activation of inflammasome assembly and expression of IL-1β requires a priming event and a second signal. Many studies have demonstrated that HIV infection alone can activate inflammasome activity. Interestingly, secreted phosphoprotein-1 (/OPN) expression is highly upregulated in the CNS of people infected with HIV and neurologic dysfunction. Interestingly, all evidence thus far suggests a protective function of signaling through mammalian target of rapamycin (mTORC1/2) pathway function to counter HIV-neuronal injury. Moreover, HIV-infected mice knocked down for show by neuroimaging, increased neuroinflammation compared to controls. This suggests that uses unique regulatory mechanisms to control the level of inflammatory signaling. In this mini review, we discuss the known and yet-to-be discovered biological links between -mediated stimulation of mTOR and inflammasome activity. Additional new mechanistic insights from studies in relevant experimental models will provide a greater understanding of crosstalk between microglia and neurons in the regulation of CNS homeostasis.

摘要

小胶质细胞和巨噬细胞的HIV感染通过直接和间接分子途径诱导神经元损伤和炎症刺激的慢性释放。很大比例的患有HIV相关神经和精神合并症的人循环炎症分子水平较高。鉴于小胶质细胞对HIV感染的易感性和长寿特性,它们是持续感染的储存库。小胶质细胞和巨噬细胞以及神经元拥有检测病原体核酸和蛋白质以激活先天免疫信号的分子机制。炎性小体组装的完全激活和IL-1β的表达需要一个启动事件和第二个信号。许多研究表明,仅HIV感染就能激活炎性小体活性。有趣的是,分泌磷蛋白-1(/OPN)的表达在感染HIV和神经功能障碍的人的中枢神经系统中高度上调。有趣的是,迄今为止所有证据都表明通过雷帕霉素哺乳动物靶点(mTORC1/2)途径功能进行信号传导具有保护功能,可对抗HIV-神经元损伤。此外,通过神经影像学显示,敲除的HIV感染小鼠与对照组相比神经炎症增加。这表明利用独特的调节机制来控制炎症信号水平。在本综述中,我们讨论了介导的mTOR刺激与炎性小体活性之间已知和尚未发现的生物学联系。相关实验模型研究的其他新机制见解将有助于更深入了解小胶质细胞和神经元在中枢神经系统稳态调节中的相互作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f14d/11032048/d96d2c8227ce/fimmu-15-1368465-g001.jpg

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