Dynorphin A
Overview
Dynorphin A is an endogenous opioid peptide of 17 amino acids that preferentially binds to and activates kappa-opioid receptors, though it also has affinity for mu and delta receptors at higher concentrations. It is derived from the precursor protein prodynorphin and plays a complex role in pain modulation, stress responses, and dysphoria.
Mechanism of Action
Unlike mu-opioid agonists, kappa receptor activation can produce analgesia without typical euphoria but may induce aversive psychological effects. Dynorphin also has non-opioid actions at high concentrations, including NMDA receptor modulation.
Research Summary & Key Findings
Dynorphin A has been extensively studied in preclinical models to characterize endogenous pain pathways and kappa-opioid receptor function. Elevated dynorphin levels have been associated with chronic pain states and stress-induced hyperalgesia in animal studies. Clinical development of dynorphin itself as a therapeutic has not advanced due to poor stability, blood-brain barrier penetration challenges, and complex receptor pharmacology.
Clinical Status
Dynorphin A is in the research phase with limited clinical data in humans. Current evidence is primarily derived from preclinical (animal or in vitro) studies.
Administration Routes
References
Primary literature
- PubMed — "Dynorphin A"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov — "Dynorphin A"
Registered interventional and observational studies, including status and phase.
- PubChem — "Dynorphin A"
Chemical structure, molecular properties, and bioactivity data.
Study-level citations for this compound are being verified against the primary sources before publication. The database queries above return the current indexed literature in the meantime.
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