Stress alleviates reduced expression of cell adhesion molecules (NCAM, L1), and deficits in learning and corticosterone regulation of apolipoprotein E knockout mice
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Chronic stress has been shown to induce time-dependent neurodegeneration in the hippocampus, ranging from a reversible damage to a permanent neuronal loss. This damage has been proposed to impair cognitive function in hippocampus-dependent learning tasks. ...
Cell adhesion molecules (CAMs) of the immunoglobulin superfamily, NCAM and L1, as well as the post-translational addition of alpha-2, 8-linked polysialic acid (PSA) homopolymers to NCAM (PSA-NCAM), have been implicated in the neural mechanisms underlying m ...
Existing evidence indicates that 21-days exposure of rats to restraint stress induces dendritic atrophy in pyramidal cells of the hippocampus. This phenomenon has been related to altered performance in hippocampal-dependent learning tasks. Prior studies ha ...
The temporal pattern of exposure to glucocorticoids has been reported to be a critical factor in determining the outcome of glucocorticoid actions at the brain. In this work, the effects of different regimes of subcutaneous corticosterone administration (a ...
The effects of 21-day exposure to restraint stress on mRNA levels of the cell adhesion molecules NCAM and L1 were evaluated in different hippocampal regions (CA1, CA3, and dentate gyrus) and other structures (thalamus, prefrontal and frontal cortices, and ...
Adrenal steroid hormones modulate learning and memory processes by interacting with specific glucocorticoid receptors at different brain areas. In this article, certain components of the physiological response to stress elicited by learning situations are ...
Previous studies showed that exposure of rats to chronic restraint stress for 21 days enhances subsequent contextual fear conditioning. Since recent evidence suggest that this effect is not dependent on stress-induced neurodegenerative processes, but to el ...
We investigated whether contextual fear conditioning could be related to the behavioral trait of locomotor reactivity to novelty in undisturbed and chronically stressed rats. Fear conditioning was found to be specifically enhanced in low reactive-stressed ...
Long-term memory for a passive avoidance task in day-old chicks has proved to depend upon an action of the adrenal steroid corticosterone through specific receptors in a brain region, the intermediate medial hyperstriatum ventrale (IMHV), involved in learn ...
Lorsque nous sommes assaillis par les conjonctions de stress incontrôlables de notre vie quotidienne, nous devenons distraits et nos facultés de mémoire à court terme font place à des réponses comportementales du registre des habitudes, cependant nos souve ...
