Bidirectional axonal plasticity during reorganization of adult rat primary somatosensory cortex

被引:3
作者
Paullus, Jeffrey R. [2 ]
Pappademos, Margarethe S. [2 ]
Nolen, Andrea M. [2 ]
Warmus, Brian A. [2 ]
Hickmott, Peter W. [1 ,2 ]
机构
[1] Univ Calif Riverside, Dept Psychol, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Interdept Neurosci Program, Riverside, CA 92521 USA
关键词
Axon pruning; Axon sprouting; Cholera toxin subunit B; Open window craniotomy; Sensory map plasticity; CORTICAL REORGANIZATION; PYRAMIDAL NEURONS; VISUAL-CORTEX; FUNCTIONAL REORGANIZATION; SYNAPTIC PLASTICITY; BEHAVIORAL RECOVERY; SQUIRREL-MONKEYS; DENDRITIC SPINES; MACAQUE MONKEYS; STRIATE CORTEX;
D O I
10.1016/j.brainres.2011.02.067
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Cortical sensory maps contain discrete functional subregions that are separated by borders that restrict tangential activity flow. Interestingly, the functional organization of border regions remains labile in adults, changing in an activity-dependent manner. Here, we investigated if axon remodeling contributes to this reorganization. We located the border between the forepaw and lower jaw representation (forepaw/lower jaw border,(FP)-F-1/LJ border) in SI of adult rats, and used a retrograde axonal tracer (cholera toxin subunit B-2, Ctb) to determine if horizontal axonal projections change after different durations of forelimb denervation or sham-denervation. In sham-denervated animals, neurons close to the border had axonal projections oriented away from the border (axonal bias). Forelimb denervation resulted in a sustained change in border location and a significant reduction in the axonal bias at the original border after 6 weeks of denervation, but not after 4 or 12 weeks. The change in axonal bias was due to an increase in axons that cross the border at 6 weeks, followed by an apparent loss of these axons by 12 weeks. This suggests that bidirectional axonal rearrangements are associated with relatively long durations of reorganization and could contribute transiently to the maintenance of cortical reorganization. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:46 / 60
页数:15
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