The distribution of nerve fibres immunoreactive for vasoactive intestinal polypeptide, calcitonin gene-related peptide, substance P and dopamine beta-hydroxylase in the normal equine larynx

Brendan Corcoran, S Jarvis, Caroline Hahn, I.G. Mayhew

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The autonomic innervation of the mammalian respiratory system is complex, and involves a wide variety of peptide and non-peptide neurotransmitters which will have an important role in normal laryngeal function and the response to disease. This innervation has been partially described in the horse airway and lung, but there is no information on the equine larynx. This paper describes the expression and distribution of nerve fibres immunoreactive for vasoactive intestinal peptide (VIP), calcitonin gene-related peptide (CGRP), substance P (SP) and the adrenergic enzymatic marker dopamine β-hydroxylase (DBH) in the mucosa of the equine larynx. The overall relative density of nerve fibres immunoreactive for the different antigens wasVIP >>CGRP>SP>>DBH. There were differences in the distribution of nerve fibre types, although each antigen was found in nerve fibres adjacent to blood vessels and mucous glands.VIP -like immunoreactivity (VIP -Li) was particularly extensive in association with mucous glands. SP - and CGRP -like immunoreactivity (SP -Li, CGRP -Li) were also seen close to the epithelium, with occasional nerve fibres coursing beneath and between the epithelial cells. Fragments of SP -Li and CGRP -Li fibres were also present in large nerve fibre bundles and ganglionic cell clusters, but not in the neurons themselves. The density of nerve fibres immunoreactive for DBH was very low and restricted to blood vessels and mucous glands. There was marked variation in the density of nerve fibres at the different sites, with the greatest density, particularly for VIP, over the arytenoid cartilage. Immunoreactive nerve fibres were less plentiful over the epiglottis, and the density of all types of nerve fibres was low over the cricoid cartilage. Overall VIP -Li nerve fibres were the most plentiful.
Original languageEnglish
Pages (from-to)251–259
Number of pages9
JournalResearch in Veterinary Science
Volume67
Issue number3
DOIs
Publication statusPublished - Dec 1999

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