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Lateralized kappa opioid receptor signaling from the amygdala central nucleus promotes stress-induced functional pain
Open accessAbstract
The response of diffuse noxious inhibitory controls (DNIC) is often decreased, or lost, in stress-related functional pain syndromes. Because the dynorphin/kappa opioid receptor (KOR) pathway is activated by stress, we determined its role in DNIC using a model of stress-induced functional pain. Male, Sprague-Dawley rats were primed for 7 days with systemic morphine resulting in opioid-induced hyperalgesia. Fourteen days after priming, when hyperalgesia was resolved, rats were exposed to environmental stress and DNIC was evaluated by measuring hind paw response threshold to noxious pressure (test stimulus) after capsaicin injection in the forepaw (conditioning stimulus). Morphine priming without stress did not alter DNIC. However, stress produced a loss of DNIC in morphine-primed rats in both hind paws that was abolished by systemic administration of the KOR antagonist, nor-binaltorphimine (nor-BNI). Microinjection of nor-BNI into the right, but not left, central nucleus of the amygdala (CeA) prevented the loss of DNIC in morphine-primed rats. Diffuse noxious inhibitory controls were not modulated by bilateral nor-BNI in the rostral ventromedial medulla. Stress increased dynorphin content in both the left and right CeA of primed rats, reaching significance only in the right CeA; no change was observed in the rostral ventromedial medulla or hypothalamus. Although morphine priming alone is not sufficient to influence DNIC, it establishes a state of latent sensitization that amplifies the consequences of stress. After priming, stress-induced dynorphin/KOR signaling from the right CeA inhibits DNIC in both hind paws, likely reflecting enhanced descending facilitation that masks descending inhibition. Kappa opioid receptor antagonists may provide a new therapeutic strategy for stress-related functional pain disorders.
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“and nor-BNI significantly prevented loss of the diffuse noxious inhibitory control response (i.e., a pain-inhibiting pain response) in the rat hindpaw after morphine-primed stress (Nation et al., 2018).”
From Drug Addiction: Hyperkatifeia/Negative Reinforcement as a Framework for Medications Development (2021) · cites this paper as Nation et al., 2018
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Metadata
- Authors
- Nation, K. M., De Felice, M., Hernandez, P. I., Dodick, D. W., Neugebauer, V., Navratilova, E., & Porreca, F.
- Affiliations
- University of Arizona (US)
- Department of Pharmacology, University of Arizona, Tucson, AZ, USA. Dr. De Felice is now with the School of Clinical Dentistry, University of Sheffield, Sheffield, United Kingdom
- Mayo Clinic in Arizona (US)
- Texas Tech University Health Sciences Center (US)
- Corresponding author
- Porreca, Frank
- Venue
- Pain
- Published
- 2018-01-23
- Volume
- 159
- Issue
- 5
- Pages
- 919-928
- ISSN
- 0304-3959 (ISSN-L)
- 1872-6623
- PMC
- PMC5916844
- OpenAlex
- W2801864057
- Cited by
- 96
- References
- 93
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 10 · 2023: 7 · 2022: 15 · 2021: 18 · 2020: 17 · 2019: 10 · 2018: 7
- FWCI
- 8.92
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Pain (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Heart, Lung, and Blood Institute (R25HL108837)
- National Institute on Drug Abuse (R01DA041809)
- National Cancer Institute (P30CA023074)
- National Institute of Neurological Disorders and Stroke (UH2NS093030, R01NS038261)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Pain Mechanisms and Treatments
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
- Life Sciences › Neuroscience › Cognitive Neuroscience › Pain Management and Placebo Effect
- Keywords
- kappa opioid receptor, dynorphin, diffuse noxious inhibitory control, central amygdala, opioid-induced hyperalgesia, nor-binaltorphimine, descending facilitation, descending inhibition, laterality, rostral ventromedial medulla
- MeSH terms
- Analgesics, Opioid, Animals, Capsaicin, Dynorphins, Hypothalamus, Male, Medulla Oblongata, Morphine, Naltrexone, Narcotic Antagonists, Pain, Stress, Physiological, Rats, Sprague-Dawley, Receptors, Opioid, kappa, Rats, Central Amygdaloid Nucleus
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