Capsaicin-sensitive nerve fibers: a potential extra-ACTH mechanism participating in adrenal regeneration in rats.

Abstract:

:Pituitary-derived factors, including ACTH, have been widely implicated in initiating adrenal regeneration. However, recent work has demonstrated that adrenal regeneration is also modulated by adrenal nerves that extensively reinnervate the regenerating adrenal. Moreover, transection of the splanchnic nerve removes sensory calcitonin gene-related peptide (CGRP) and preganglionic sympathetic vesicular acetylcholine transporter (VAChT)-positive fibers from the regenerating gland and delays regeneration. However, it is not known whether the splanchnic nerve effects on adrenal regeneration are mediated by the CGRP-positive or VAChT-positive innervation. The present studies use the drug capsaicin, a neurotoxin selective for a subset of primary afferent neurons, to specifically remove CGRP-positive fibers from the adrenal gland and assess subsequent effects on the recovery of adrenal mass and function after surgical enucleation. Male, Sprague-Dawley rats were anesthetized and treated with capsaicin (vs. vehicle) periaxonally to the thoracic splanchnic nerve (33 mM, 15 minutes) or systemically (30-100 mg/kg for 4 days, s.c.). After 7-12 days of recovery, rats received right adrenalectomy and left adrenal enucleation. At 14 and 21 days postenucleation, prestress and poststress plasma and adrenals glands were collected; adrenals were weighed and fixed for immunolabeling of CGRP-positive nerve fibers. Periaxonal capsaicin treatment decreased adrenal CGRP content prior to surgical enucleation; however, reinnervation by CGRP-positive fibers was not prevented and regeneration was not affected. Systemic capsaicin treatment attenuated the reinnervation by CGRP-positive fibers and increased the rate, but not extent, of adrenal regeneration. These results support the hypothesis that adrenal innervation represents an extra-ACTH mechanism to modulate the rate of adrenal regeneration.

journal_name

Microsc Res Tech

authors

Ulrich-Lai YM,Fraticelli AI,Engeland WC

doi

10.1002/jemt.10334

keywords:

subject

Has Abstract

pub_date

2003-06-15 00:00:00

pages

252-8

issue

3

eissn

1059-910X

issn

1097-0029

journal_volume

61

pub_type

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