Substance P and vasoactive intestinal peptide in serotonin‐induced nasal secretions in normal subjects

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Abstract
The aim of this study was to examine if nasal secretions contained substance P and/or vasoactive intestinal peptide. Serotonin nasal challenge was performed in 14 normal subjects 15 min after intranasal pretreatment (double-blind) with atropine, methysergide, chlorpheniramine or isotonic saline. Serotonin induced a dose-dependent increase in secretion (P < 0.05), and only pretreatment with atropine reduced the secretion (P < 0.02). Substance P, measured by radioimmunoassay, was found in all of the examined secretions (n = 100) with a median concentration of 13.7 pmol/l (range 1.7-125.0). Serotonin challenge increased the concentration or content of substance P in a dose-related fashion (P < 0.01).The different pretreatments did not affect the concentration of substance P. Vasoactive intestinal peptide was found in low concentration in 37% of the secretions with a median concentration of opmol/l (range 0-50.0).