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In aging brain, degeneration or functional impairment of the hippocampus has been connected with stress dysregulation, serving to disinhibit stress responses and allow for glucocorticoid hypersecretion and its attendant pathophysiology. Hippocampal dysfunction appears to be communicated to paraventricular hypothalamic corticotropin-releasing hormone neurons by way of subcortical GABAergic neurons...
Hypothalamo-pituitary-adrenocortical (HPA) axis aging was studied in young (3 mo), middle aged (15 mo) and aged (30 mo) F344/Brown Norway hybrid rats. This strain was selected to obviate HPA-relevant pathologies found in other aging models. Aged, unstressed rats showed enhanced central HPA drive, marked by elevated ACTH release and decreased pituitary proopiomelanocortin and corticotropin-releasing...
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