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Am J Physiol Lung Cell Mol Physiol 261: L223-L235, 1991;
1040-0605/91 $5.00
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AJP - Lung Cellular and Molecular Physiology, Vol 261, Issue 4 223-L235, Copyright © 1991 by American Physiological Society

ARTICLES

Neuropeptides and nasal secretion

J. N. Baraniuk and M. Kaliner
Department of Thoracic Medicine, National Heart and Lung Institute, London, United Kingdom.

The nasal mucosa is innervated by the sensory, parasympathetic, and sympathetic nervous systems. Nociceptive sensory nerves are stimulated by mucosal injury, inhalation of irritants, or mast cell degranulation and release of the calcitonin gene-related peptide, the tachykinins substance P and neurokinin A, and other peptides by the axon response mechanism. Sensory nerve stimulation initiates systemic reflexes, such as the sneeze, and central parasympathetic reflexes which release acetylcholine, vasoactive intestinal peptide, and other peptides and lead to glandular secretion. In concert, these proinflammatory neural responses lead to vasodilation, vascular permeability, and glandular secretion. Sympathetic nerves release neuropeptide Y and norepinephrine, potent vasoconstrictors which act to decompress the nasal mucosa and produce nasal patency. The balance between the effects of parasympathetic and sympathetic neurotransmitters may regulate nasal homeostasis, whereas the nociceptive sensory system may be held in reserve as a defense mechanism. Dysfunction of these systems may lead to pathological nasal syndromes. In the future, specific neuropeptide agonists and antagonists may be useful for the treatment of human rhinitic diseases.


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