期刊
PSYCHONEUROENDOCRINOLOGY
卷 25, 期 3, 页码 213-238出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0306-4530(99)00058-X
关键词
amygdala; basolateral nucleus; corticosterone; dexamethasone; glucocorticoid receptor; hippocampus; norepinephrine; beta-adrenoceptor; memory consolidation
资金
- NIMH NIH HHS [MH12526] Funding Source: Medline
This paper summarizes recent findings on the amygdala's role in mediating acute effects of glucocorticoids on memory consolidation in rats. Posttraining activation of glucocorticoid-sensitive pathways involving glucocorticoid receptors (GRs or type II) enhances memory consolidation in a dose-dependent inverted-U fashion. Selective lesions of the basolateral nucleus of the amygdala (BLA) or infusions of beta-adrenoceptor antagonists into the BLA block the memory-modulatory effects of systemic injections of glucocorticoids. Additionally, posttraining infusions of a specific GR agonist administered directly into the BLA enhance memory consolidation, whereas those of a GR antagonist impair. These findings indicate that glucocorticoid effects on memory consolidation are mediated, in part, by an activation of GRs in the BLA and that the effects require beta-adrenergic activity in the BLA. Other findings indicate that the BLA interacts with the hippocampus in mediating glucocorticoid-induced modulatory influences on memory consolidation. Lesions of the BLA or inactivation of beta-adrenoceptors within the BLA also block the memory-modulatory effects of intra-hippocampal administration of a GR agonist or antagonist. These findings are in agreement with the general hypothesis that the BLA integrates hormonal and neuromodulatory influences on memory consolidation. However, the BLA is not a permanent locus of storage for this information, but modulates consolidation processes for explicit/associative memories in other brain regions, including the hippocampus. (C) 2000 Elsevier Science Ltd. All rights reserved.
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