Neuropeptides and Animal Physiology

Neuropeptides are short chains of amino acids released by neurons that act as chemical messengers, binding to receptors throughout the brain and body to regulate everything from pain perception and stress responses to immune function and heart rate. Unlike classical neurotransmitters, they tend to act more slowly and over longer distances, giving them an outsized influence on sustained states such as anxiety, depression, and chronic pain — conditions where molecules like the opioid peptides, calcitonin gene-related peptide, and pituitary adenylate cyclase-activating polypeptide have emerged as central players. Researchers are actively working to untangle how the same neuropeptide can produce dramatically different effects depending on which receptor subtype it activates, in which tissue, and under what physiological conditions. A pressing open question is how to exploit this specificity therapeutically — for instance, blocking CGRP signaling has already yielded effective migraine treatments, and similar receptor-targeted strategies are now being pursued for stress-related psychiatric disorders.

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Keywords

NeuropeptidesReceptorsOpioidCalcitonin Gene-Related PeptidePituitary Adenylate Cyclase-Activating PolypeptideStress