Neural Regeneration Research ›› 2012, Vol. 7 ›› Issue (7): 523-527.

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Kappa opioid receptor antagonist and N-methyl-D- aspartate receptor antagonist affect dynorphin- induced spinal cord electrophysiologic impairment

Yu Chen, Liangbi Xiang, Jun Liu, Dapeng Zhou, Hailong Yu, Qi Wang, Wenfeng Han, Weijian Ren   

  1. Department of Orthopedics, General Hospital of Shenyang Military Area Command of Chinese PLA, Shenyang 110016, Liaoning Province, China
  • Received:2011-12-02 Revised:2012-02-16 Online:2012-03-05 Published:2012-03-05
  • Contact: Liangbi Xiang, Master, Chief physician, Department of Orthopedics, General Hospital of Shenyang Military Area Command of Chinese PLA, Shenyang 110016, Liaoning Province, China xiangliangbi1963@sina.com
  • About author:Yu Chen☆, Doctor, Associate chief physician, Department of Orthopedics, General Hospital of Shenyang Military Area Command of Chinese PLA, Shenyang 110016, Liaoning Province, China

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Abstract:

The latencies of motor- and somatosensory-evoked potentials were prolonged to different degrees, and wave amplitude was obviously decreased, after injection of dynorphin into the rat subarachnoid cavity. The wave amplitude and latencies of motor- and somatosensory-evoked potentials were significantly recovered at 7 and 14 days after combined injection of dynorphin and either the kappa opioid receptor antagonist nor-binaltorphimine or the N-methyl-D-aspartate receptor antagonist MK-801. The wave amplitude and latency were similar in rats after combined injection of dynorphin and nor-binaltorphimine or MK-801. These results suggest that intrathecal injection of dynorphin causes damage to spinal cord function. Prevention of N-methyl-D-aspartate receptor or kappa receptor activation lessened the injury to spinal cord function induced by dynorphin.

Key words: spinal cord injury, dynorphin, Kappa receptor, N-methyl-D-aspartate receptor, motor-evoked potential, somatosensory-evoked potential, electrophysiology