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Plasticity of subcortical pathways promote recovery of skilled hand function in rats after corticospinal and rubrospinal tract injuries.

作者信息

García-Alías Guillermo, Truong Kevin, Shah Prithvi K, Roy Roland R, Edgerton V Reggie

机构信息

Department of Integrative Biology and Physiology, University of California, Los Angeles, USA.

Department of Integrative Biology and Physiology, University of California, Los Angeles, USA.

出版信息

Exp Neurol. 2015 Apr;266:112-9. doi: 10.1016/j.expneurol.2015.01.009. Epub 2015 Feb 7.


DOI:10.1016/j.expneurol.2015.01.009
PMID:25666586
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6952174/
Abstract

The corticospinal and rubrospinal tracts are the predominant tracts for controlling skilled hand function. Injuries to these tracts impair grasping but not gross motor functions such as overground locomotion. The aim of the present study was to determine whether or not, after damage to both the corticospinal and rubrospinal tracts, other spared subcortical motor pathway can mediate the recovery of skilled hand function. Adult rats received a bilateral injury to the corticospinal tract at the level of the medullar pyramids and a bilateral ablation of the rubrospinal axons at C4. One group of rats received, acutely after injury, two injections of chondroitinase-ABC at C7, and starting at 7days post-injury were enrolled in daily reaching and grasping rehabilitation (CHASE group, n=5). A second group of rats received analogous injections of ubiquitous penicillinase, and did not undergo rehabilitation (PEN group, n=5). Compared to rats in the PEN group, CHASE rats gradually recovered the ability to reach and grasp over 42days after injury. Overground locomotion was mildly affected after injury and both groups followed similar recovery. Since the reticulospinal tract plays a predominant role in motor control, we further investigated whether or not plasticity of this pathway could contribute to the animal's recovery. Reticulospinal axons were anterogradely traced in both groups of rats. The density of reticulospinal processes in both the normal and ectopic areas of the grey ventral matter of the caudal segments of the cervical spinal cord was greater in the CHASE than PEN group. The results indicate that after damage to spinal tracts that normally mediate the control of reaching and grasping in rats other complementary spinal tracts can acquire the role of those damaged tracts and promote task-specific recovery.

摘要

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本文引用的文献

[1]
Examination of the combined effects of chondroitinase ABC, growth factors and locomotor training following compressive spinal cord injury on neuroanatomical plasticity and kinematics.

PLoS One. 2014-10-28

[2]
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J Neurosci. 2014-10-1

[3]
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Curr Biol. 2014-3-31

[4]
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J Neurosci. 2014-2-26

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Nerve regeneration restores supraspinal control of bladder function after complete spinal cord injury.

J Neurosci. 2013-6-26

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Reticulospinal plasticity after cervical spinal cord injury in the rat involves withdrawal of projections below the injury.

Exp Neurol. 2013-5-17

[7]
Evidence for long-lasting subcortical facilitation by transcranial direct current stimulation in the cat.

J Physiol. 2013-3-18

[8]
Neurotransmitter phenotypes of descending systems in the rat lumbar spinal cord.

Neuroscience. 2012-9-24

[9]
Delayed treatment with chondroitinase ABC promotes sensorimotor recovery and plasticity after stroke in aged rats.

Brain. 2012-3-6

[10]
Chondroitinase ABC combined with neurotrophin NT-3 secretion and NR2D expression promotes axonal plasticity and functional recovery in rats with lateral hemisection of the spinal cord.

J Neurosci. 2011-12-7

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