Fig. 1
From: Neuropeptides in asthma, chronic obstructive pulmonary disease and cystic fibrosis
Summary of the effects of neuropeptides on mucus secretion from submucosal glands and goblet cells. Diagram shows model of airway. An up arrow indicates increased secretion, a down arrow indicates decreased secretion. A question mark indicates effect unknown. Abbreviations: SubP, substance P; NKA, neurokinin A; VIP, vasoactive intestinal peptide; CGRP, calcitonin gene-related peptide; NPY, neuropeptide Y; COPD, chronic obstructive pulmonary disease; CF, cystic fibrosis