Evoked bursting in injured Aβ dorsal root ganglion neurons: A mechanism underlying tactile allodynia

Chronic compression of rat dorsal root ganglion (CCD) produced tactile allodynia accompanied with hyperexcitability of the myelinated A beta dorsal root ganglion (DRG) neurons. The A beta DRG neuron hyperexcitability exhibits as bursting discharges in response to peripherally evoked action potentials (evoked bursting [EB]). The incidence of EB was significantly increased after chronic compression of DRG (CCD) (43.3%) vs control (13.3%). EB was maintained by oscillation of the membrane potential, and its duration was increased when the membrane potential was depolarized. EB was found to coexist in some neurons with spontaneous bursting (SB), but EB always occurred at a more negative membrane potential than SB. Afterdischarges of the wide dynamic range neurons of the dorsal horn in the spinal cord in response to electrical stimulation of A beta afferent nerve fibers were suppressed by blocking EB of the DRG neurons. CCD neurons with EB exhibited increased current density of persistent sodium current (I-Nap) and hyperpolarization-activated cation current (I-h) and decreased alpha-dendrotoxin (alpha-DTX) sensitive current (I-DTX). The increased I-h activated by afterhyperpolarization of peripheral afferent action potential was necessary for EB generation and a balance between I-DTX and I-Nap might be necessary for EB maintenance. This study may suggest a role of EB of myelinated DRG neurons in development of allodynia after nerve injury and a potential pharmaceutical therapy in treating neuropathic allodynia. (C) 2011 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.