Abstract
Rats habituated to handling preceding sacrifice have higher [ 3H]GABA receptor binding in different brain areas (cerebellum, frontal cortex, caudate nucleus) than naive animals. The increase in GABA binding in handling-habituated rats is due to an increase in the number of receptors (B max) with no changes in the affinity of GABA binding for its ligand ( K d ). Foot shock causes a sudden fall in GABA binding in handling-habituated rats but does not, or only slightly, in naive ones. The results indicate that stress causes a rapid decrease in GABA receptor binding in the central nervous system and that the GABA binding values which are usually considered as normal are, in fact, values decreased by the handling manoeuvers preceding sacrifice.
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