nounIntermediate
Definition
Opioid neuropeptide family that preferentially binds κ (kappa) opioid receptors; involved in pain modulation, stress response, addiction, and dysphoria.
Detailed Explanation
Dynorphins are derived from the precursor protein prodynorphin and include dynorphin A (17 aa), dynorphin B (13 aa), and several shorter fragments. Unlike endorphins (which bind μ receptors and produce euphoria), dynorphins primarily activate κ-opioid receptors and produce dysphoria, sedation, and diuresis. The dynorphin/κ-receptor system is heavily implicated in the negative emotional states of drug withdrawal and stress, making it a target for addiction research. κ-Receptor antagonists are being investigated for depression and substance use disorders. Dynorphins are also involved in spinal cord pain processing and are released during chronic pain states.
Key Facts
- Dynorphins are derived from the precursor protein prodynorphin and include dynorphin A (17 aa), dynorphin B (13 aa), and several shorter fragments
- Unlike endorphins (which bind μ receptors and produce euphoria), dynorphins primarily activate κ-opioid receptors and produce dysphoria, sedation, and diuresis
- The dynorphin/κ-receptor system is heavily implicated in the negative emotional states of drug withdrawal and stress, making it a target for addiction research
- κ-Receptor antagonists are being investigated for depression and substance use disorders
- Dynorphins are also involved in spinal cord pain processing and are released during chronic pain states
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