EFFECTS OF INTRAAMYGDALA INJECTIONS OF NMDA RECEPTOR ANTAGONISTS ON ACQUISITION AND RETENTION OF INHIBITORY AVOIDANCE

被引:147
作者
KIM, M
MCGAUGH, JL
机构
[1] UNIV CALIF IRVINE,DEPT PSYCHOBIOL,IRVINE,CA 92717
[2] UNIV CALIF IRVINE,CTR NEUROBIOL LEARNING & MEMORY,IRVINE,CA 92717
关键词
AMYGDALA; INHIBITORY AVOIDANCE; LONG-TERM POTENTIATION; NMDA RECEPTOR; AP5; CPP; MK-801;
D O I
10.1016/0006-8993(92)91188-K
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
These experiments examined the effects of intra-amygdala injections of NMDA receptor antagonists on the acquisition and retention of inhibitory avoidance. In Expt. I, rats received bilateral intra-amygdala injections of the NMDA antagoniStS D,L-AP5 (1-10-mu-g), D-AP5 (0.03-1-mu-g), CPP (0.125 or 0.375-mu-g), or MK-801 (0.2 or 0.5-mu-g) prior to training in a continuous multiple-trial inhibitory avoidance (CMIA) task. Acquisition of the task was not significantly affected by any of the drug injections. In contrast, all three competitive antagonists, D,L-AP5, D-AP5 and CPP, produced dose-dependent impairment of 48 h retention performance. Although the MK-801 injections did not significantly impair retention performance, the retention scores of the 0.5-mu-g MK-801 group were bimodally distributed, indicating retention impairment in a subgroup of the animals given that dose. Intra-amygdala injections of 3 or 10-mu-g D,L-AP5 did not affect footshock sensitivity (Expt. II) or locomotor activity (Expt. III) and their retention-impairing effects were not due to induction of state dependency (Expt. IV). The retention-impairing effects of intra-amygdala injections of NMDA antagonists were not due to diffusion of the drugs dorsally: injections of 1-mu-g D-AP5 into the striatal area directly above the amygdala impaired acquisition but not retention performance (Expt. V). The retention-impairing effects of 1-mu-g D-AP5 or 0.5-mu-g MK-801 were attenuated by giving additional training to the animals shortly after receiving intra-amygdala injections (Expt. VI). The implications of these findings for hypotheses concerning amygdala function in learning and memory are discussed.
引用
收藏
页码:35 / 48
页数:14
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