Resolution of inflammation-induced axonal mechanical sensitivity and conduction slowing in C-fiber nociceptors

Dilley, Andrew and Bove, Geoffrey M (2008) Resolution of inflammation-induced axonal mechanical sensitivity and conduction slowing in C-fiber nociceptors. Journal of Pain, 9 (2). pp. 185-92. ISSN 1526-5900

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Abstract

The present study is an in vivo investigation into the time course of inflammation-induced axonal mechanical sensitivity (AMS) in intact C-fiber axons. After induction of a localized neuritis in the rat sciatic nerve, AMS developed in C-fiber axons at 1 (18.2%) and 4 weeks (11.6%). By 8 weeks, AMS was virtually absent (2.1%). AMS was also tested in intact L5 neurons after L4 spinal nerve transection, which induces a diffuse inflammation within the sciatic nerve. At 1 week, AMS developed in 10% of neurons. No AMS was observed in unoperated animals. The localized neuritis also caused changes in L5 dorsal root conduction velocities (CVs). CVs decreased at 1 week (-7.7%) and 4 weeks (-17.6%) and returned to normal by 8 weeks. L4 transection similarly reduced CVs (-13.7%) of L5 dorsal root axons. There were no significant changes among any groups in the proportion or rate of ongoing activity. These results demonstrate that the axonal changes due to neuritis are not permanent. Therefore, in patients with persistent movement-induced radiating limb pain with few clinically apparent signs of nerve damage, there may be a persisting inflammatory lesion affecting the nerve. PERSPECTIVE: Nerve inflammation, or neuritis, causes axonal mechanical sensitivity, which is the neural substrate for radiating limb pain induced by movement. This study examined the time course of induced axonal mechanical sensitivity and conduction velocity changes in intact C-fiber axons after nerve inflammation. The results suggest that treatment to reduce nerve inflammation may be beneficial to patients with radiating pain.

Item Type: Article
Additional Information: CODEN: JPOAB PubMed ID: 18309534
Keywords: axonal mechanical sensitivity; conduction velocity; electrophysiology; inflammation; Neuritis; nociceptors
Schools and Departments: Brighton and Sussex Medical School > Clinical and Laboratory Investigation
Brighton and Sussex Medical School > Clinical and Experimental Medicine
Subjects: Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology
R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry > RC0346 Neurology. Diseases of the nervous system Including speech disorders
Depositing User: Andrew Dilley
Date Deposited: 25 Aug 2011 14:57
Last Modified: 01 Sep 2017 10:15
URI: http://sro.sussex.ac.uk/id/eprint/7198
Google Scholar:14 Citations
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