星形胶质细胞中铁蛋白的丢失可减少实验性自身免疫性脑脊髓炎 (EAE) 模型中的脊髓氧化应激和脱髓鞘。
Ferritin loss in astrocytes reduces spinal cord oxidative stress and demyelination in the experimental autoimmune encephalomyelitis (EAE) model.
机构信息
Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, Institute for Myelin and Glia Exploration, The State University of New York, University at Buffalo, Buffalo, New York, USA.
出版信息
Glia. 2024 Dec;72(12):2327-2343. doi: 10.1002/glia.24616. Epub 2024 Sep 3.
Demyelinating diseases such as multiple sclerosis (MS) cause myelin degradation and oligodendrocyte death, resulting in the release of toxic iron and iron-induced oxidative stress. Astrocytes have a large capacity for iron transport and storage, however the role of astrocytic iron homeostasis in demyelinating disorders is not completely understood. Here we investigate whether astrocytic iron metabolism modulates neuroinflammation, oligodendrocyte survival, and oxidative stress following demyelination. To this aim, we conditionally knock out ferritin in astrocytes and induce experimental autoimmune encephalomyelitis (EAE), an autoimmune-mediated model of demyelination. Ferritin ablation in astrocytes reduced the severity of disease in both the acute and chronic phases. The day of onset, peak disease severity, and cumulative clinical score were all significantly reduced in ferritin KO animals. This corresponded to better performance on the rotarod and increased mobility in ferritin KO mice. Furthermore, the spinal cord of ferritin KO mice display decreased numbers of reactive astrocytes, activated microglia, and infiltrating lymphocytes. Correspondingly, the size of demyelinated lesions, iron accumulation, and oxidative stress were attenuated in the CNS of ferritin KO subjects, particularly in white matter regions of the spinal cord. Thus, deleting ferritin in astrocytes reduced neuroinflammation, oxidative stress, and myelin deterioration in EAE animals. Collectively, these findings suggest that iron storage in astrocytes is a potential therapeutic target to lessen CNS inflammation and myelin loss in autoimmune demyelinating diseases.
脱髓鞘疾病,如多发性硬化症(MS),导致髓鞘降解和少突胶质细胞死亡,从而导致有毒铁的释放和铁诱导的氧化应激。星形胶质细胞具有很强的铁运输和储存能力,但是星形胶质细胞铁平衡在脱髓鞘疾病中的作用尚未完全了解。在这里,我们研究了星形胶质细胞铁代谢是否调节脱髓鞘后的神经炎症、少突胶质细胞存活和氧化应激。为此,我们条件性敲除星形胶质细胞中的铁蛋白,并诱导实验性自身免疫性脑脊髓炎(EAE),这是一种脱髓鞘的自身免疫介导模型。星形胶质细胞中铁蛋白的缺失减少了急性和慢性阶段疾病的严重程度。在铁蛋白 KO 动物中,疾病发作的时间、疾病严重程度的峰值和累积临床评分均显著降低。这与铁蛋白 KO 小鼠在旋转棒上的表现更好和移动性增加相对应。此外,铁蛋白 KO 小鼠的脊髓中反应性星形胶质细胞、活化的小胶质细胞和浸润的淋巴细胞数量减少。相应地,铁蛋白 KO 动物的中枢神经系统中脱髓鞘病变、铁积累和氧化应激的大小减少,尤其是脊髓的白质区域。因此,在星形胶质细胞中敲除铁蛋白减少了 EAE 动物中的神经炎症、氧化应激和髓鞘退化。总之,这些发现表明,星形胶质细胞中的铁储存可能是减轻自身免疫性脱髓鞘疾病中中枢神经系统炎症和髓鞘丢失的潜在治疗靶点。
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