HPA axis function in depression and dementia: A review

This article reviews recent advances in the understanding of hypothalamic‐pituitary‐adrenal (HPA) dysfunction in depression and dementia. Although the dexamethasone suppression test (DST) has proved disappointing as a diagnostic test, more recent tests of HPA axis function have not yet been adequately investigated in this regard. There is mounting evidence from both animal and human studies that a complex interrelationship exists between mood, age, cognitive function, brain structure and HPA axis dysfunction. To explore this relationship further, studies combining clinical, neuroimaging and neuroendocrine investigation are required.