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NMDA receptor antagonism in the basolateral amygdala blocks enhancement of inhibitory avoidance learning in previously trained rats.

Abstract：

:Extensive evidence suggests that N-methyl-D-aspartate (NMDA) glutamate receptor channels in the amygdala are involved in fear-motivated learning, and infusion of NMDA receptor antagonists into the amygdala blocks memory of fear-motivated tasks. Recent studies have shown that previous training can prevent the amnestic effects of NMDA receptor antagonists on spatial learning. In the present study, we evaluated whether infusion of the NMDA antagonist D,L-2-amino-5-phosphonopentanoic acid (AP5) into the basolateral nucleus of the amygdala (BLA) impairs reinforcement of inhibitory avoidance learning in rats given previous training. Adult male Wistar rats (220-310 g) were bilaterally implanted under thionembutal anesthesia (30 mg/kg, i.p.) with 9.0-mm guide cannulae aimed 1.0 mm above the BLA. Infusion of AP5 (5.0 microg) 10 min prior to training in a step-down inhibitory avoidance task (0.4 mA footshock) blocked retention measured 24 h after training. When infused 10 min prior to a second training session in animals given previous training (0.2 mA footshock), AP5 blocked the enhancement of retention induced by the second training. Control experiments showed that the effects were not due to alterations in motor activity or footshock sensitivity. The results suggest that NMDA receptors in the basolateral amygdala are involved in both formation of memory for inhibitory avoidance and enhancement of retention in rats given previous training.

journal_name

Behav Brain Res

journal_title

Behavioural brain research

authors

Roesler R,Vianna MR,de-Paris F,Rodrigues C,Sant'Anna MK,Quevedo J,Ferreira MB

doi

10.1016/s0166-4328(00)00169-8

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

99-105

issue

1-2

eissn

0166-4328

issn

1872-7549

pii

S0166432800001698

journal_volume

112

pub_type

杂志文章

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