Neuropeptides and Animal Physiology

Neuropeptides are small protein-like molecules released by neurons that act as chemical messengers, binding to receptors throughout the brain and body to regulate everything from pain and stress responses to immune function and heart rate. Unlike classical neurotransmitters, they tend to act more slowly and over longer distances, allowing them to fine-tune physiological states in ways that are still being mapped in detail. Researchers are particularly focused on molecules such as opioid peptides, calcitonin gene-related peptide, and pituitary adenylate cyclase-activating polypeptide, which have emerged as central players in anxiety, depression, and chronic pain — conditions where current treatments remain inadequate. Open questions include how different receptor subtypes produce distinct downstream effects in specific cell types, and how neuropeptide signaling is altered by chronic stress in ways that might predispose individuals to psychiatric or cardiovascular disease.

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Keywords

NeuropeptidesReceptorsOpioidCalcitonin Gene-Related PeptidePituitary Adenylate Cyclase-Activating PolypeptideStress