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Anesthesiology Research and Practice
Volume 2012 (2012), Article ID 921405, 9 pages
http://dx.doi.org/10.1155/2012/921405
Research Article

Pre-Emptive Treatment of Lidocaine Attenuates Neuropathic Pain and Reduces Pain-Related Biochemical Markers in the Rat Cuneate Nucleus in Median Nerve Chronic Constriction Injury Model

1Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei 10018, Taiwan
2School of Medicine, College of Medicine, Fu Jen Catholic University, Taipei 24205, Taiwan
3Department of Anatomy, Taipei Medical College, Taipei 100, Taiwan

Received 31 July 2011; Accepted 8 September 2011

Academic Editor: Jacques E. Chelly

Copyright © 2012 Chi-Te Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study investigates the effects of lidocaine pre-emptive treatment on neuropathic pain behavior, injury discharges of nerves, neuropeptide Y (NPY) and c-Fos expression in the cuneate nucleus (CN) after median nerve chronic constriction injury (CCI). Behavior tests demonstrated that the pre-emptive lidocaine treatment dose dependently delayed and attenuated the development of mechanical allodynia within a 28-day period. Electrophysiological recording was used to examine the changes in injury discharges of the nerves. An increase in frequency of injury discharges was observed and peaked at postelectrical stimulation stage in the presaline group, which was suppressed by lidocaine pre-emptive treatment in a dose-dependent manner. Lidocaine pretreatment also reduced the number of injury-induced NPY-like immunoreactive (NPY-LI) fibers and c-Fos-LI neurons within the CN in a dose-dependent manner. Furthermore, the mean number of c-Fos-LI neurons in the CN was significantly correlated to the NPY reduction level and the sign of mechanical allodynia following CCI.