Effects of cholecystokinin octapeptide and BC 264, a potent and selective CCK-B agonist on aspartate and glutamate release from rat hippocampal slices

Martine Migaud (1, 2) , B.P. Roques (1, 2) , C. Durieux (1, 2)

1 U 266
2 URA D 1500

In rat hippocampal slices, BC 264 (0.1-1 microM), a highly potent and selective CCK-B agonist, was found to increase basal release of endogenous glutamate and aspartate but not that of GABA. The natural peptide cholecystokinin octapeptide (CCK8) at 1 microM, induced the same effect. The selective CCK-B receptor antagonist, L-365,260, completely reversed these responses, confirming that they are related to CCK-B receptor activation. In the absence of extracellular Ca2+, the increase in excitatory amino acid release was completely abolished. In contrast to the basal release, the potassium evoked release of aspartate and glutamate was not modified by BC 264.

Mots clés: cholecystikinin octapeptide; cck-b receptors; excitatory amino acids; release; hippocampus

Domaines: Neurosciences

Martine Migaud, B.P. Roques, C. Durieux. Effects of cholecystokinin octapeptide and BC 264, a potent and selective CCK-B agonist on aspartate and glutamate release from rat hippocampal slices. Neuropharmacology, 1994, 33 (6), pp.737-743. ⟨hal-01602192⟩