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Previous studies using animal models of cognitive aging showed that hypothalamic–pituitary–adrenal (HPA) responses to stress are impaired and glucocorticoid receptor (GR) mRNA is decreased in cognitively impaired aged rats, compared with those in young rats and cognitively unimpaired aged rats. Increased HPA activity is associated with the loss of hippocampal corticosteroid receptors. In the current...
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