Glossary
Dynorphin
What is dynorphin?
Dynorphins are opioid peptides made by the body from a precursor called prodynorphin. They are a different family from beta-endorphin, which comes from proopiomelanocortin. Dynorphins preferentially activate kappa-opioid receptors.
What they do
Dynorphin signaling is involved in pain, stress responses, and mood. Its effects on pain depend on where and under what conditions it acts; it does not always reduce pain. Activation of kappa receptors can also produce dysphoria, an unpleasant mood state, and aversion.
Researchers study this signaling in chronic pain, addiction, and depression. It is one part of the biology of these conditions, not a complete explanation of any of them.
Why it matters
“The body’s own opioids” covers several peptide families with different, overlapping actions. Knowing which peptide and receptor are involved matters. Dynorphin and kappa-receptor signaling are being investigated as treatment targets, but identifying a target and demonstrating an effective treatment are different steps.