HPA axis disturbance in obsessive-compulsive disorder

Area of Science:

• Neuroendocrinology
• Psychiatry
• Clinical Psychology

Background:

• The dexamethasone suppression test (DST) is used to assess hypothalamic-pituitary-adrenal (HPA) axis function.
• Previous research suggests alterations in HPA axis activity in various psychiatric disorders.
• The neuroendocrine profile of obsessive-compulsive disorder (OCD) requires further elucidation.

Purpose of the Study:

• To investigate the HPA axis function in patients with obsessive-compulsive disorder (OCD) using the DST.
• To compare DST results in OCD patients with those of patients with panic disorder and healthy controls.

Main Methods:

• Twenty nondepressed outpatients with DSM-III obsessive-compulsive disorder (OCD) participated in a 10-week placebo-controlled study of clomipramine.
• A 1-mg dexamethasone suppression test (DST) was administered at baseline, with 11 patients repeating the DST at the end of treatment.
• Postdexamethasone cortisol levels were measured and compared between OCD patients, panic disorder patients, and a group of never-ill controls.

Main Results:

• Nonsuppression of cortisol following dexamethasone administration was infrequent in OCD patients.
• OCD patients exhibited substantially lower and more stable postdexamethasone cortisol values compared to patients with panic disorder.
• The DST results in the OCD group were comparable to those observed in never-ill control subjects.

Conclusions:

• The findings suggest that patients with obsessive-compulsive disorder (OCD) have a distinct neuroendocrine profile characterized by lower and more stable HPA axis activity compared to patients with panic disorder.
• The HPA axis function in OCD, as assessed by the DST, appears to be similar to that of healthy individuals.
• These results may have implications for understanding the pathophysiology of OCD and differentiating it from other psychiatric conditions.