• Brain research · Jul 1999

    The effects of RB101, a mixed inhibitor of enkephalin-catabolizing enzymes, on carrageenin-induced spinal c-Fos expression are completely blocked by beta-funaltrexamine, a selective mu-opioid receptor antagonist.

    • S Le Guen, P Honoré, G Catheline, M C Fournié-Zaluski, B P Roques, and J M Besson.
    • Physiopharmacologie du Système Nerveux, Institut National de la Santé et de la Recherche Médicale U161 and Ecole Pratique des Hautes Etudes, 2 rue d'Alésia, Paris 75014, France. leguen@broca.inserm.fr
    • Brain Res. 1999 Jul 10; 834 (1-2): 200-6.

    AbstractWe have demonstrated that pre-administered RB101 (40 mg/kg, i.v.), a mixed inhibitor of enkephalin-catabolizing enzymes, decreased spinal c-Fos expression induced 1 h and 30 min after intraplantar (i.pl.) carrageenin (41% reduction, p<0.01). These effects were completely blocked by pre-administered beta-funaltrexamine (10 mg/kg, i.v., 24 h prior to stimulation), a selective long-lasting mu-opioid receptor antagonist. In conclusion, these results clearly demonstrate that the effects of endogenous enkephalins on noxiously evoked spinal c-Fos expression are essentially mediated via mu-opioid receptors.Copyright 1999 Elsevier Science B.V.

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