Abstract
Huntington disease is a genetic neurodegenerative disorder that produces motor, neuropsychiatric, and cognitive deficits and is caused by an abnormal expansion of the CAG tract in the huntingtin (htt) gene. In humans, mutated htt induces a preferential loss of medium spiny neurons in the striatum and, to a lesser extent, a loss of cortical neurons as the disease progresses. The mechanisms causing these degenerative changes remain unclear, but they may involve synaptic dysregulation. We examined the activity of the corticostriatal pathway using a combination of electrophysiological and optical imaging approaches in brain slices and acutely dissociated neurons from the YAC128 mouse model of Huntington disease. The results demonstrated biphasic age-dependent changes in corticostriatal function. At 1 month, before the behavioral phenotype develops, synaptic currents and glutamate release were increased. At 7 and 12 months, after the development of the behavioral phenotype, evoked synaptic currents were reduced. Glutamate release was decreased by 7 months and was markedly reduced by 12 months. These age-dependent alterations in corticostriatal activity were paralleled by a decrease in dopamine D2receptor modulation of the presynaptic terminal. Together, these findings point to dynamic alterations at the corticostriatal pathway and emphasize that therapies directed toward preventing or alleviating symptoms need to be specifically designed depending on the stage of disease progression.
Bibliography
Joshi, P. R., Wu, N.-P., André, V. M., Cummings, D. M., Cepeda, C., Joyce, J. A., Carroll, J. B., Leavitt, B. R., Hayden, M. R., Levine, M. S., & Bamford, N. S. (2009). Age-Dependent Alterations of Corticostriatal Activity in the YAC128 Mouse Model of Huntington Disease. The Journal of Neuroscience, 29(8), 2414â2427.
Authors
11
- Prasad R. Joshi (first)
- Nan-Ping Wu (additional)
- Véronique M. André (additional)
- Damian M. Cummings (additional)
- Carlos Cepeda (additional)
- John A. Joyce (additional)
- Jeffrey B. Carroll (additional)
- Blair R. Leavitt (additional)
- Michael R. Hayden (additional)
- Michael S. Levine (additional)
- Nigel S. Bamford (additional)
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Dates
Type | When |
---|---|
Created | 16 years, 6 months ago (Feb. 25, 2009, 1:34 p.m.) |
Deposited | 6 months, 3 weeks ago (Feb. 7, 2025, 5:22 p.m.) |
Indexed | 4 days, 19 hours ago (Aug. 26, 2025, 2:47 a.m.) |
Issued | 16 years, 6 months ago (Feb. 25, 2009) |
Published | 16 years, 6 months ago (Feb. 25, 2009) |
Published Online | 16 years, 6 months ago (Feb. 25, 2009) |
Published Print | 16 years, 6 months ago (Feb. 25, 2009) |
@article{Joshi_2009, title={Age-Dependent Alterations of Corticostriatal Activity in the YAC128 Mouse Model of Huntington Disease}, volume={29}, ISSN={1529-2401}, url={http://dx.doi.org/10.1523/jneurosci.5687-08.2009}, DOI={10.1523/jneurosci.5687-08.2009}, number={8}, journal={The Journal of Neuroscience}, publisher={Society for Neuroscience}, author={Joshi, Prasad R. and Wu, Nan-Ping and André, Véronique M. and Cummings, Damian M. and Cepeda, Carlos and Joyce, John A. and Carroll, Jeffrey B. and Leavitt, Blair R. and Hayden, Michael R. and Levine, Michael S. and Bamford, Nigel S.}, year={2009}, month=feb, pages={2414–2427} }