Adolescents with a history of maltreatment and a mild level of depression were found to release much more of the stress hormone cortisol than is normal in response to psychological stressors such as giving a speech or solving a difficult arithmetic test.
"This kind of reaction is a problem because cortisol kills cells in areas of the brain that control memory and emotion regulation," explains Kate Harkness, a psychology professor and an expert in the role of stress and trauma in adolescent depression. "Over time cortisol levels can build up and increase a person's risk for more severe endocrine impairment and more severe depression."
Blunting of the endocrine response to stress
At severe levels of depression, Harkness' team saw that the youths with a history of maltreatment had a total blunting of the endocrine response to stress. These findings suggest that the normal operation of the stress response system can break down in severely depressed adolescents.
These results are important because they show that environmental stress in childhood changes the function of the brain in ways that may cause and/or maintain severe psychiatric disorders such as depression.
Harkness recently presented her findings at the International Society for Affective Disorders Conference in Toronto, Canada. - (EurekAlert!, April 2011)
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