自噬相关基因的转录组变化与炎症呈负相关,并与多发性硬化症病变病理相关。

Transcriptomic changes in autophagy-related genes are inversely correlated with inflammation and are associated with multiple sclerosis lesion pathology.

作者信息

Misrielal Chairi, Alsema Astrid M, Wijering Marion H C, Miedema Anneke, Mauthe Mario, Reggiori Fulvio, Eggen Bart J L

机构信息

Section Molecular Neurobiology, the Netherlands.

Section Molecular Cell Biology, Department of Biomedical Sciences of Cells & Systems, University of Groningen, University Medical Center Groningen, Antonius Deusinglaan 1, 9713AV, Groningen, the Netherlands.

出版信息

Brain Behav Immun Health. 2022 Sep 8;25:100510. doi: 10.1016/j.bbih.2022.100510. eCollection 2022 Nov.

Abstract

Autophagy is a lysosomal degradative pathway essential for maintaining cellular homeostasis and is also implicated in multiple aspects of both innate and adaptive immunity. Neuroinflammation, along with demyelination and axonal loss, is an important component of multiple sclerosis (MS). Induction of autophagy ameliorated disease progression in experimental autoimmune encephalomyelitis (EAE), a mouse model for MS, underlying a possible link between autophagy and MS pathology. However, it is still unclear how autophagy is affected during different stages of MS. Here, we show a decreased expression of the () genes during the acute phase of EAE development in mice as well as in mixed active/inactive lesions of post-mortem human MS brain tissues. Using spatial transcriptomics, we observed that this decreased gene expression is most prominent in the core of mixed active/inactive lesions. Furthermore, we observed a hyper-activation of the mammalian target of rapamycin complex 1 (mTORC1) in lesions, which could inhibit both the initiation of autophagy and the transcription factors that regulate the expression of the genes. Thus, based on our data, we propose a negative regulation of autophagy in MS, possibly through persistent mTORC1 activation, which depends on the lesion stage. Our results contribute to the understanding of the role of autophagy in different stages of MS pathology and point to the mTORC1 pathway as a potential modulator that likely regulates central nervous system (CNS) homeostasis and neuroinflammation in MS.

摘要

自噬是一种对维持细胞稳态至关重要的溶酶体降解途径,并且还与先天性免疫和适应性免疫的多个方面有关。神经炎症以及脱髓鞘和轴突损失是多发性硬化症(MS)的重要组成部分。在实验性自身免疫性脑脊髓炎(EAE,一种MS的小鼠模型)中,自噬的诱导改善了疾病进展,这暗示了自噬与MS病理学之间可能存在联系。然而,目前仍不清楚在MS的不同阶段自噬是如何受到影响的。在这里,我们发现在小鼠EAE发展的急性期以及死后人类MS脑组织的混合活动/非活动病变中,()基因的表达降低。使用空间转录组学,我们观察到这种基因表达降低在混合活动/非活动病变的核心最为明显。此外,我们在病变中观察到雷帕霉素复合物1(mTORC1)的哺乳动物靶点过度激活,这可能会抑制自噬的起始以及调节基因表达的转录因子。因此,基于我们的数据,我们提出MS中自噬的负调控,可能是通过持续的mTORC1激活,这取决于病变阶段。我们的结果有助于理解自噬在MS病理学不同阶段中的作用,并指出mTORC1途径作为一种潜在的调节因子,可能调节MS中的中枢神经系统(CNS)稳态和神经炎症。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5625/9478930/c105ce091723/ga1.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索