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
中科院分区:
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
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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