Abstract:
:We recently reported that peripheral nerve injury produced by sciatic nerve transection induces a persistent increase in the expression of the immunoreactive Fos protein product of the c-fos proto-oncogene, an indicator of neuronal activity, in the lumbar spinal cord of the rat and that local anesthetic blockade of the peripheral neuroma attenuates this long-term expression of Fos. In addition to the sustained activity of the injured afferents, the nerve transection itself results, acutely, in a massive injury-induced neural discharge. In this study we evaluated the effect of blocking this massive injury discharge on the persistence of Fos expression. Just prior to nerve transection we applied the short-acting local anesthetic, lidocaine, to the sciatic nerve. Control injections were made subcutaneously on the dorsum of the neck. We report that injection of the local anesthetic, by either route, significantly reduced the number of fos-like immunoreactive neurons at 2 days after nerve transection. The effect was only observed on neurons in the superficial dorsal horn. These results indicate that along with sustained activity of injured afferents and of reorganization of central circuits after injury, the initial brief discharge at the time of nerve injury contributes to a prolonged increase in the activity of spinal cord neurons.
journal_name
Brain Resjournal_title
Brain researchauthors
Chi SI,Levine JD,Basbaum AIdoi
10.1016/0006-8993(93)91089-bsubject
Has Abstractpub_date
1993-07-23 00:00:00pages
220-4issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(93)91089-Bjournal_volume
617pub_type
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