Numerous nerve fibers containing neuropeptide Y (NPY) and calcitonin gene—related peptide (CGRP) have been found in the human nasal mucosa by means of immunocytochemistry. We detected NPY Y1 and CGRP1 receptors at the same location using reverse transcriptase-polymerase chain reaction. The possibility of local release in connection with specific target receptors suggests a role for endogenous NPY and CGRP in the regulation of vascular tone, glandular secretion, and epithelial functions.
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