Intracerebroventricular administration of 0.01-1.0 micrograms of the peptide FMRFamide (Phe-Met-Arg-Phe-NH2) to mice suppressed feeding induced by the specific kappa opiate agonist, U-50, 488H. This suggests that FMRFamide, or FMRFamide-like neuropeptides, may have a role in the control of kappa opioid mediated feeding in the mouse.
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http://dx.doi.org/10.1016/0196-9781(85)90312-2 | DOI Listing |
Neuropharmacology
March 2025
Department of Experimental Medicine, Division of Pharmacology, Università della Campania "L. Vanvitelli", Naples, Italy.
Cannabidiol has been shown to ameliorate neuropathic pain and its affective components. Previous studies highlighted the pharmacological interaction between the CBD and opioid system, particularly the MOR, but the understanding of the interaction between CBD and kappa opioid receptor (KOR), physiologically stimulated by the endogenous opioid dynorphin, remains elusive. We assessed the pharmacological interactions between CBD and nor-BNI, a selective KOR antagonist in a rat neuropathic pain model.
View Article and Find Full Text PDFNeuroscience
January 2025
Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou 730000, PR China. Electronic address:
Increasing evidence indicates that neuropeptide FF (NPFF) produces analgesic effects and augments opioid-induced analgesia at the spinal level. However, our recent research demonstrated that NPFF exerted complex opioid-modulating effects in an inflammatory pain model after intrathecal (i.t.
View Article and Find Full Text PDFDrug Alcohol Depend
January 2025
Drug Design and Synthesis Section, Molecular Targets and Medications Discovery Branch, NIDA and NIAAA, Bethesda, MD, USA.
Background: Kappa-opioid receptors (KOR) are hypothesized to be involved in mediating ongoing methamphetamine self-administration. Previous rat studies have demonstrated that treatment with the KOR antagonist nor-binaltorphimine (nor-BNI) decreases methamphetamine self-administration. However, KOR antagonist effects on methamphetamine self-administration in nonhuman primates are unknown.
View Article and Find Full Text PDFTransl Psychiatry
November 2024
Department of Clinical Neuroscience, Center for Molecular Medicine, Karolinska Institutet, Stockholm, SE-17176, Sweden.
Naltrexone (NTX), a homolog of the opiate antidote naloxone, is an orally active long-acting general opioid receptor antagonist used in the treatment of opiate dependence. NTX is also found to relieve craving for alcohol and is one of few FDA-approved medications for treatment of alcohol use disorder (AUD). While it was early on established that NTX acts by blocking the binding of endogenous opioid peptide ligands released by alcohol, experimental evidence emerged that could not be fully accounted for by this explanation alone, suggesting that NTX may have additional modes of action.
View Article and Find Full Text PDFRegul Toxicol Pharmacol
December 2024
Saifu Laboratories Co., Ltd., Beijing, China; SAFE Medical Technology Co., Ltd., Hebei, China. Electronic address:
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