Abstract
The distribution of glutamate receptors in the rat hippocampus was investigated 24 h after the social stress of confrontation with a dominant opponent. AMPA-type glutamate receptors were labeled with the antagonist [ 3H]CNQX, and NMDA-type receptors were labeled with the competitive antagonist [ 3H]CGP39653. Increased [ 3H]CGP39653 labeling was exclusively found in the CA3 stratum radiatum and a decreased [ 3H]CNQX labeling was found in several hippocampal areas. Consequently, the ratio NMDA/AMPA binding was significantly increased in CA3 stratum oriens and CA3 stratum radiatum. These results suggest that a single unescapable social stress of defeat alters the impact of the excitatory neurotransmitter glutamate, which is restricted to hippocampal CA3 neurons. Possible consequences of the present findings are discussed.
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