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Previous Article | Next Article
The Journal of Neuroscience, November 1, 2001, 21(21):8473-8481
Huntingtin Aggregate-Associated Axonal Degeneration is an Early Pathological Event in Huntington's Disease Mice
He Li1, 3, Shi-Hua Li1, Zhao-Xue Yu1, Peggy Shelbourne2, and Xiao-Jiang Li1 1 Department of Genetics, Emory University School of Medicine, Atlanta, Georgia 30322, 2 Division of Molecular Genetics, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G11 6NU, United Kingdom, and 3 Department of Histology and Embryology, Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
Huntington's disease (HD) is characterized by the selective loss of striatal projection neurons. In early stages of HD, neurodegeneration preferentially occurs in the lateral globus pallidus (LGP) and substantia nigra (SN), two regions in which the axons of striatal neurons terminate. Here we report that in mice expressing full-length mutant huntingtin and modeling early stages of HD, neuropil aggregates form preferentially in the LGP and SN. The progressive formation of these neuropil aggregates follows intranuclear accumulation of mutant huntingtin and becomes prominent from 11 to 27 months after birth. Neuropil aggregates, but no intranuclear inclusions, were observed in the LGP and SN, suggesting that huntingtin aggregates are formed in the axons of striatal projection neurons. In the LGP and SN, we observed degenerated axons in which huntingtin aggregates were associated with dark, swollen organelles that resemble degenerated mitochondria. Neuritic aggregates also form in cultured striatal neurons expressing mutant huntingtin, block protein transport in neurites, and cause neuritic degeneration before nuclear DNA fragmentation occurs. These findings suggest that the early neuropathology of HD originates from axonal dysfunction and degeneration associated with huntingtin aggregates.
Key words: Huntingtin; polyglutamine; axon; degeneration; transport; mitochondria
Copyright © 2001 Society for Neuroscience 0270-6474/01/21218473-09$05.00/0
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