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Localisation of the neuropeptide PACAP and its receptors in the rat parathyroid and thyroid glands.

Abstract：

:PACAP (pituitary adenylate cyclase activating polypeptide) is widely distributed neuropeptide acting via three subtypes of receptors, PAC(1), VPAC(1) and VPAC(2). Here we examined the localisation and nature of PACAP-immunoreactive nerves in the rat thyroid and parathyroid glands and defined the distribution of PAC(1), VPAC(1) and VPAC(2) receptor mRNA's. In the parathyroid gland a large number of nerve fibres displaying PACAP-immunoreactivity were distributed beneath the capsule, around blood vessels and close to glandular cells. Most of the PACAP-nerves were sensory, since they co-stored CGRP (calcitonin-gene-related peptide) and were sensitive to capsaicin-treatment. mRNA's for PAC(1) and VPAC(2) receptors occurred in the parathyroid gland, mainly located in the glandular cells. In the thyroid gland PACAP-immunoreactive nerve fibres were associated with blood vessels, thyroid follicles and parafollicular C-cells. A high degree of co-existence between PACAP and VIP (vasoactive intestinal polypeptide) was observed in the intrathyroid nerve fibres and cell bodies of the thyroid ganglion indicating a common origin for the two peptides. A minor population of PACAP-immunoreactive nerve fibres with relation to blood vessels co-stored NPY (neuropeptide Y), whereas only a few fibres co-stored CGRP. PAC(1) and VPAC(1) receptor mRNA's occurred in follicular cells and blood vessels, whereas the expression of the VPAC(2) receptor was low. The findings suggest that PACAP plays a role in the regulation of parathyroid and thyroid blood flow and hormone secretion.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Fahrenkrug J,Hannibal J

doi

10.1016/j.ygcen.2010.11.026

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

105-13

issue

1

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(10)00415-6

journal_volume

171

pub_type

杂志文章

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