The Korean Journal of Pain

The Korean Pain Society (대한통증학회)
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Comparison of Mechanical Allodynia and Recovery of Locomotion and Bladder Function by Different Parameters of Low Thoracic Spinal Contusion Injury in Rats

  • Carter, Michael W. (Department of Neuroscience and Cell Biology, University of Texas Medical Branch at Galveston) ;
  • Johnson, Kathia M. (Department of Neuroscience and Cell Biology, University of Texas Medical Branch at Galveston) ;
  • Lee, Jun Yeon (Department of Physiology, Daegu Haany University) ;
  • Hulsebosch, Claire E. (Department of Neuroscience and Cell Biology, University of Texas Medical Branch at Galveston) ;
  • Gwak, Young Seob (Department of Physiology, Daegu Haany University)
  • Received : 2016.01.06
  • Accepted : 2016.03.05
  • Published : 2016.04.01
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Abstract

Background: The present study was designed to examine the functional recovery following spinal cord injury (SCI) by adjusting the parameters of impact force and dwell-time using the Infinite Horizon (IH) impactor device. Methods: Sprague-Dawley rats (225-240 g) were divided into eight injury groups based on force of injury (Kdyn) and dwell time (seconds), indicated as Force-Dwell time: 150-4, 150-3, 150-2, 150-1, 150-0, 200-0, 90-2 and sham controls, respectively. Results: After T10 SCI, higher injury force produced greater spinal cord displacement (P < 0.05) and showed a significant correlation (r = 0.813) between the displacement and the force (P < 0.05). In neuropathic pain-like behavior, the percent of paw withdrawals scores in the hindpaw for the 150-4, 150-3, 150-2, 150-1 and the 200-0 injury groups were significantly lowered compared with sham controls (P < 0.05). The recovery of locomotion had a significant within-subjects effect of time (P < 0.05) and the 150-0 group had increased recovery compared to other groups (P < 0.05). In addition, the 200-0 and the 90-2 recovered significantly better than all the 150 kdyn impact groups that included a dwell-time (P < 0.05). In recovery of spontaneous bladder function, the 150-4 injury group took significantly longer recovery time whereas the 150-0 and the 90-2 groups had the shortest recovery times. Conclusions: The present study demonstrates SCI parameters optimize development of mechanical allodynia and other pathological outcomes.

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References

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