Journal
NEUROREPORT
Volume 12, Issue 16, Pages 3529-3532Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200111160-00031
Keywords
allodynia; dorsal root ganglion; neuropathic pain; peripheral neuropathy; sympathetic sprouting
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We examined whether the extent of sympathetic sprouting in the dorsal root ganglion was a function of the number of injured nerve fibers. We compared two groups of rats. One group was subjected to unilateral superior and inferior caudal trunk transections; at the level between the S-1 and S-2 spinal nerves (S-1 group) and the other group was subjected to unilateral superior caudal trunk transection at the same level (S group). Immunohistochemical staining with tyrosine hydroxylase (TH) antibody of the S-1 DRG revealed that the degree of TH-immunoreactive fibers was more extensive in the S-1 group than in the S group. However, there was no difference in the severity of neuropathic pain behaviors between the two groups.' These results suggest that the extent of sympathetic sprouting in the DRG following peripheral nerve injury is proportionally related to the amount of injured nerve fibers, but not related to the degree of neuropathic pain behaviors. (C) 2001 Lippincott Williams & Wilkins.
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