期刊
JOURNAL OF NEUROSCIENCE
卷 29, 期 3, 页码 653-668出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3814-08.2009
关键词
axon degeneration; Wallerian degeneration; neurodegeneration; slow Wallerian degeneration gene; neuroprotection; neuromuscular junction
资金
- Biotechnology and Biological Sciences Research Council
- German Federal Ministry of Education and Research [BMBF-LPD9901/8-128]
- Royal Society of Edinburgh/ Scottish Executive Support Research Fellowship
- MRC [G0401091, G0300408] Funding Source: UKRI
- Medical Research Council [G0300408, G0401091] Funding Source: researchfish
Axon degeneration contributes widely to neurodegenerative disease but its regulation is poorly understood. The Wallerian degeneration slow (Wld(S)) protein protects axons dose-dependently in many circumstances but is paradoxically abundant in nuclei. To test the hypothesis that Wld(S) acts within nuclei in vivo, we redistributed it from nucleus to cytoplasm in transgenic mice. Surprisingly, instead of weakening the phenotype as expected, extranuclear Wld(S) significantly enhanced structural and functional preservation of transected distal axons and their synapses. In contrast to native Wld(S) mutants, distal axon stumps remained continuous and ultrastructurally intact up to 7 weeks after injury and motor nerve terminals were robustly preserved even in older mice, remaining functional for 6d. Moreover, we detect extranuclear Wld(S) for the first time in vivo, and higher axoplasmic levels in transgenic mice with Wld(S) redistribution. Cytoplasmic Wld(S) fractionated predominantly with mitochondria and microsomes. We conclude that Wld(S) can act in one or more nonnuclear compartments to protect axons and synapses, and that molecular changes can enhance its therapeutic potential.
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