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  • Title: Kappa-opioid receptor stimulation abolishes mu- but not delta-mediated inhibitory control of spinal Met-enkephalin release.
    Author: Collin E, Bourgoin S, Ferhat L, Hamon M, Cesselin F.
    Journal: Neurosci Lett; 1992 Jan 06; 134(2):238-42. PubMed ID: 1317026.
    Abstract:
    The possible opioid control through delta, mu and kappa receptors of the spinal release of Met-enkephalin-like material (MELM) was investigated in halothane-anaesthetized rats. The intrathecal perfusion of the delta agonist DTLET (10 microM) or the mu agonist DAGO (10 microM) resulted in a marked inhibition of MELM release, which could be prevented by the selective antagonists naltrindole and naloxone, respectively. Although the kappa agonist U 50488 H (10 microM) was inactive per se, it completely suppressed the inhibitory effect of DAGO, without affecting that of DTLET. As the selective kappa antagonist norbinaltorphimine blocked the action of U 50488 H, it can be concluded that kappa receptors modulate the mu- (but not the delta-) mediated feed back control of spinal enkephalinergic neurones.
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