摘要: Cholecystokinin (CCK) is a peptide hormone which has long been known to be present in the pancreas and gastro-intestinal tract recently found brain (Morley 1982). High concentrations are animal human cerebral cortex, basal ganglia, hypothalamus limbic lobe (hippocampus, amygdala, olfactory tubercle associated cortices) (Geola et al. 1981). The major CCK entity COOH-terminal octapeptide CCK-8, although lesser amounts of tetrapeptide CCK-4 1981; Rehfeld 1978) found. There good evidence that acts as neu- rotransmitter or neuromodulator CNS; it synthesised neurones concentrated synaptic vesicles, its release calcium-dependent (Emson 1980 b) potent excitatory effect on postsynaptic membranes hip- pocampal cells (Dodd Kelly In addition there have several reports high-affinity binding sites for radiolabelled brains rodents man (Hays