CD8+ T cells cause disability and axon loss in a mouse model of multiple sclerosis.

CD8+ T cells cause disability and axon loss in a mouse model of multiple sclerosis.
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DOI:
10.1371/journal.pone.0012478
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发表时间:
2010-08-30
期刊:
影响因子:
3.7
通讯作者:
Howe CL
Howe CL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Deb C;Lafrance-Corey RG;Schmalstieg WF;Sauer BM;Wang H;German CL;Windebank AJ;Rodriguez M;Howe CL

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本研究的目的是验证CD8+ T细胞直接介导脱髓鞘中枢神经系统运动障碍和轴突损伤的假设。我们先前已经观察到,在慢性脱髓鞘小鼠中,CD8+ T细胞效应分子穿孔素的遗传缺失导致运动功能和脊髓轴突的保存。为了确定CD8+ T细胞是否是直接损伤脱髓鞘轴突所必需和足够的,我们将纯化的穿孔素活性CD8+脊髓浸润T细胞过继转移到深度脱髓鞘但功能保留的穿孔素缺陷宿主小鼠中。转移CD8+脊髓浸润性T细胞迅速和不可逆地损害运动功能,破坏脊髓运动传导,并减少中口径和大口径脊髓轴突的数量。同样,免疫耗竭慢性脱髓鞘野生型小鼠的CD8+ T细胞保留了运动功能和有限的轴突损失,而不改变其他疾病参数。在多发性硬化患者中,活动性病变中的CD8+ T细胞数量超过CD4+ T细胞,并且CD8+ T细胞的数量与进行性轴突损伤和功能障碍的程度相关。我们的研究结果表明,CD8+ T细胞可能直接损伤脱髓鞘轴突,因此是一个可行的治疗靶点,以保护多发性硬化症患者的轴突和运动功能。
The objective of this study was to test the hypothesis that CD8+ T cells directly mediate motor disability and axon injury in the demyelinated central nervous system. We have previously observed that genetic deletion of the CD8+ T cell effector molecule perforin leads to preservation of motor function and preservation of spinal axons in chronically demyelinated mice. To determine if CD8+ T cells are necessary and sufficient to directly injure demyelinated axons, we adoptively transferred purified perforin-competent CD8+ spinal cord-infiltrating T cells into profoundly demyelinated but functionally preserved perforin-deficient host mice. Transfer of CD8+ spinal cord-infiltrating T cells rapidly and irreversibly impaired motor function, disrupted spinal cord motor conduction, and reduced the number of medium- and large-caliber spinal axons. Likewise, immunodepletion of CD8+ T cells from chronically demyelinated wildtype mice preserved motor function and limited axon loss without altering other disease parameters. In multiple sclerosis patients, CD8+ T cells outnumber CD4+ T cells in active lesions and the number of CD8+ T cells correlates with the extent of ongoing axon injury and functional disability. Our findings suggest that CD8+ T cells may directly injure demyelinated axons and are therefore a viable therapeutic target to protect axons and motor function in patients with multiple sclerosis.
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