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SHORT COMMUNICATION Selective enhancement of spatial learning under chronic psychosocial stress
Author(s) -
Bartolomucci Alessandro,
De Biurrun Gabriel,
Czéh Boldizsár,
Van Kampen Marja,
Fuchs Eberhard
Publication year - 2002
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.1460-9568.2002.02043.x
Subject(s) - dentate gyrus , hippocampal formation , neuroscience , hippocampus , effects of stress on memory , chronic stress , psychology , corticosterone , endocrinology , memory consolidation , medicine , hormone
The hippocampus has long been proved to be implicated in several learning and memory processes. Being integrated into the limbic‐hypothalamus‐pituitary‐adrenal axis, the hippocampus also plays an active role in the regulation of the stress response. Long lasting elevated levels of glucocorticoids resulting from a prolonged stress exposure affect hippocampal functions and structure, inducing learning and memory alterations and suppressing cell proliferation in the adult dentate gyrus. Here, adult male tree shrews ( Tupaia belangeri ) exposed to chronic psychosocial stress were tested repeatedly on a holeboard apparatus using two different learning tasks devised to evaluate hippocampal‐dependent and hippocampal‐independent cognitive function. We show that chronic stress enhanced learning in animals performing the hippocampal‐dependent task, whereas no stress‐induced effect was found in the hippocampal‐independent task. Additionally, after five weeks of stress, cell proliferation was reduced in the hippocampal dentate gyrus. These results indicate that specific memory processes not only may remain intact, but indeed are facilitated by chronic stress, despite elevated cortisol levels and suppressed hippocampal cell proliferation.