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Bilateral hyperexcitability of thalamic VPL neurons following unilateral spinal injury in rats

Authors
 J.H. Jang  ;  B.H. Lee  ;  T.S. Nam  ;  J.W. Kim  ;  D.W. Kim  ;  J.W. Leem 
Citation
 JOURNAL OF PHYSIOLOGICAL SCIENCES, Vol.60(1) : 59-66, 2010 
Journal Title
JOURNAL OF PHYSIOLOGICAL SCIENCES
ISSN
 1880-6546 
Issue Date
2010
MeSH
Animals ; Electric Stimulation ; Evoked Potentials, Somatosensory ; Hindlimb/physiology ; Male ; Neurons/physiology* ; Pain/physiopathology ; Physical Stimulation ; Rats ; Rats, Sprague-Dawley ; SpinalCord Injuries/physiopathology* ; VentralThalamicNuclei/physiology*
Keywords
Central neuropathic pain ; Hyperexcitability ; Spinal cord injury ; Ventral posteriorlateral
Abstract
In the present study, we have examined whether spinal hemisection injury induces changes in the electrophysiological properties of thalamic ventral posteriorlateral (VPL) neurons in rats. Male Sprague-Dawley rats were subjected to unilateral spinal cord injury by transverse hemisection at the T13 spinal segment. Four weeks after the T13 spinal hemisection, the injured rats displayed robust allodynic behaviors on both sides of hindpaws compared to sham controls (P < 0.05). Extracellular recordings taken 4 weeks after the hemisection revealed that wide dynamic range (WDR) neurons had significantly increased spontaneous and brush-, pressure-, and pinch-evoked activities, respectively, on both sides of the thalamic VPL regions (P < 0.05). In contrast, low threshold (LT) neurons showed only an increase in the brush-evoked activity compared to sham controls (P < 0.05). However, afterdischarge activity in both types of neurons showed no changes. In addition, both sides of the thalamic VPL regions showed higher incidences of WDR neurons. In conclusion, our data demonstrate that spinal unilateral injury induces bilaterally increased evoked activity in thalamic VPL neurons.
Full Text
http://link.springer.com/article/10.1007%2Fs12576-009-0066-2
DOI
10.1007/s12576-009-0066-2
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Leem, Joong Woo(임중우) ORCID logo https://orcid.org/0000-0002-1605-2230
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/100441
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