Cortisol and catecholamines in posttraumatic stress disorder: an epidemiologic community study

Area of Science:

• Neuroscience
• Psychiatry
• Endocrinology

Background:

• Previous research suggests a link between posttraumatic stress disorder (PTSD) and elevated catecholamines.
• Studies on cortisol levels in individuals with PTSD have yielded inconsistent findings.

Purpose of the Study:

• To investigate urinary catecholamine and cortisol levels in a community-based sample of individuals diagnosed with PTSD.
• To explore the relationship between trauma exposure, PTSD, and neuroendocrine markers.

Main Methods:

• A longitudinal cohort of young adults was followed for 10 years, assessing trauma exposure and PTSD.
• A subsample underwent urine collection over two consecutive nights and an intermediate day in a sleep laboratory.
• Urinary levels of catecholamines and cortisol were measured in participants with and without PTSD, and in trauma-exposed controls.

Main Results:

• Individuals with lifetime PTSD exhibited significantly higher urinary catecholamine levels compared to trauma-exposed individuals without PTSD and non-exposed controls.
• Urinary catecholamine levels were lower in individuals exposed to trauma without PTSD compared to both non-exposed and PTSD groups.
• No significant differences in mean urinary cortisol levels were observed across groups, except in women with comorbid major depressive disorder (MDD) and PTSD, who showed elevated cortisol.

Conclusions:

• Trauma exposure alone does not result in sustained increases in catecholamine or cortisol levels.
• Posttraumatic stress disorder is specifically associated with elevated catecholamine levels.
• Cortisol levels in individuals with PTSD remain unchanged, but comorbid MDD in women with PTSD is linked to higher cortisol levels.