Calcitonin gene-related peptide potentiates substance P-induced plasma extravasation in the rat trachea.

Abstract:

:Antidromic stimulation of vagal sensory nerves is known to produce plasma extravasation in the rat trachea. This neurogenic inflammation is thought to be mediated by substance P or other tachykinins released from sensory nerve endings. We sought to determine whether calcitonin gene-related peptide (CGRP), which is also released from sensory nerve endings, can potentiate substance P-induced plasma extravasation in the rat trachea. To accomplish this, we measured the amounts of Evans blue dye extravasated into the trachea after intravenous injections of substance P alone and combined with CGRP. We found that when substance P and CGRP were injected together, the amount of plasma extravasation produced in the trachea was substantially greater than the amount produced when substance P was injected alone. This potentiation was critically dependent on the dosage of CGRP and was not observed when relatively high dosages were used. We also found that CGRP had a potent hypotensive effect and speculate that reduced blood pressure may account for the lack of potentiation observed at the higher CGRP dosages. Based on these findings, we conclude that CGRP can potentiate substance P-induced plasma extravasation in the rat trachea and may therefore play a role in modulating neurogenic inflammation of the airways.

journal_name

Lung

journal_title

Lung

authors

Brokaw JJ,White GW

doi

10.1007/BF00175980

keywords:

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

85-93

issue

2

eissn

0341-2040

issn

1432-1750

journal_volume

170

pub_type

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