Wang Yuhang, Ghimire Sudeep, Mangalam Ashutosh, Kang Zizhen
Department of Pathology, University of Iowa, Iowa City, IA, 52242, USA.
J Neuroinflammation. 2025 May 21;22(1):135. doi: 10.1186/s12974-025-03463-x.
Oligodendroglial lineage cells (OLCs) are essential for myelination, remyelination and neuronal metabolic support, but recent evidence suggests they also play active roles in neuroinflammation. This study aimed to identify the inflammatory translatome of OLCs during the onset of experimental autoimmune encephalomyelitis (EAE), a widely used model for Multiple Sclerosis (MS), using RiboTag-based RNA sequencing. We crossed RiboTag mice with Olig2-Cre mice to obtain strain-specific expression of HA-tagged ribosomal protein Rpl22 in OLCs, enabling the isolation of ribosome-associated mRNA from these cells for sequencing by using HA beads. Compared to controls, 1,556 genes were upregulated and 683 were downregulated in EAE OLCs. Gene enrichment revealed elevated immune-related pathways, including cytokine signaling, interferon responses and antigen presentation, whereas downregulated genes were associated with myelination and neuronal development. Notably, significant expression of cytokines/chemokines and their receptors was detected in OLCs. Further investigations focused on the role of IFNGR and IFNAR in EAE pathogenesis. IFN-γ signaling in OLCs exacerbated EAE pathogenesis by enhancing antigen processing, presentation, and chemokine production (e.g., Ccl2, Ccl7). In contrast, IFN-β signaling appeared less critical. These findings highlight the inflammatory role of OLCs in EAE, suggesting OLCs as a potential therapeutic target for mitigating neuroinflammation in MS and related disorders.
少突胶质细胞谱系细胞(OLCs)对髓鞘形成、髓鞘再生和神经元代谢支持至关重要,但最近有证据表明它们在神经炎症中也发挥着积极作用。本研究旨在利用基于RiboTag的RNA测序技术,确定实验性自身免疫性脑脊髓炎(EAE,一种广泛应用于多发性硬化症(MS)研究的模型)发病过程中OLCs的炎症转录组。我们将RiboTag小鼠与Olig2-Cre小鼠杂交,以在OLCs中获得HA标签核糖体蛋白Rpl22的品系特异性表达,从而能够使用HA磁珠从这些细胞中分离核糖体相关mRNA进行测序。与对照组相比,EAE的OLCs中有1556个基因上调,683个基因下调。基因富集分析显示免疫相关通路增强,包括细胞因子信号传导、干扰素反应和抗原呈递,而下调基因与髓鞘形成和神经元发育相关。值得注意的是,在OLCs中检测到细胞因子/趋化因子及其受体的显著表达。进一步的研究聚焦于IFNGR和IFNAR在EAE发病机制中的作用。OLCs中的IFN-γ信号通过增强抗原加工、呈递和趋化因子产生(如Ccl2、Ccl7)加剧了EAE的发病机制。相比之下,IFN-β信号似乎不太关键。这些发现突出了OLCs在EAE中的炎症作用,表明OLCs可能是减轻MS及相关疾病神经炎症的潜在治疗靶点。