Relationship between hypothalamic-pituitary-adrenal axis dysregulation and insulin resistance in elderly patients with depression

Psychiatry Research
Katsutoshi YokoyamaKoichi Kaneko

Abstract

Cortisol dysregulation has been proposed to be involved in depression. Hypothalamic-pituitary-adrenal (HPA) axis dysregulation associated with major depressive disorder (MDD) was previously reported to be higher in the elderly. Furthermore, insulin resistance and the prevalence of type 2 diabetes are known to increase with aging. The aim of the present study was to determine whether a relationship existed between plasma cortisol levels following the dexamethasone/corticotrophin-releasing hormone (DEX/CRH) test and insulin resistance evaluated by the homeostasis model assessment of insulin resistance (HOMA-R) in elderly MDD subjects. Fifteen unmedicated MDD inpatients and 17 age- and sex-matched healthy controls participated in this study. After overnight fasting, blood samples were collected to measure plasma glucose and insulin concentrations, estimate HOMA-R, and perform the DEX/CRH test to evaluate HPA axis function. The value of the area under the time curve of plasma cortisol concentrations (CortAUC) and peak cortisol values (Cortpeak) following the administration of DEX/CRH both correlated with HOMA-R in MDD group. In contrast, neither CortAUC nor Cortpeak correlated with HOMA-R in controls. This is the first study to dir...Continue Reading

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