DHEA Moderates the Impact of Childhood Trauma on the HPA Axis in Adolescence.

Background: Trauma can lead to long-term downregulation of the hypothalamic pituitary adrenal (HPA) axis. However, dehydroepiandrosterone (DHEA) has neuroprotective effects that may reduce the need for downregulation of the axis in response to stress. Furthermore, high DHEA/cortisol ratios are often conceptualized as better markers of DHEA's availability than DHEA alone, as ratios account for the coupling of DHEA and cortisol in response to stress.

Objectives: In this study, we explored if DHEA and DHEA/cortisol ratios moderated the association between childhood maltreatment and the HPA axis stress response.

Methods: The sample consisted of 101 adolescents (ages 12-16) who completed the Child Trauma Questionnaire (CTQ) and the Trier Social Stress Test (TSST). Cortisol was modeled using saliva samples at 8 time points throughout the TSST. Cortisol and DHEA ratios were examined at baseline and 35 min after stress initiation.

Results: Childhood maltreatment was associated with less steep cortisol activation slope and peak cortisol levels, but DHEA and DHEA/cortisol ratios moderated this effect. At high levels of DHEA, the impact of childhood maltreatment on cortisol peak levels was no longer significant. In contrast, high DHEA/cortisol ratios were associated with an intensification of the impact of childhood maltreatment on peak levels.

Conclusions: Results suggest that DHEA can limit the blunting of the HPA axis in response to childhood maltreatment. However, this protective effect was not reflected in high DHEA/cortisol ratios as predicted. Therefore, high DHEA and high DHEA/cortisol ratios may reflect different, and potentially opposite, processes.