Dopamine function in obsessive compulsive disorder: cortisol response to acute apomorphine stimulation

Area of Science:

• Neuroscience
• Endocrinology
• Psychiatry

Background:

• Obsessive compulsive disorder (OCD) is a debilitating mental health condition.
• Central dopaminergic dysfunction has been hypothesized to play a role in OCD pathogenesis.
• Understanding the neurobiological underpinnings of OCD is crucial for developing effective treatments.

Purpose of the Study:

• To investigate central dopaminergic function in patients with OCD.
• To assess the relationship between dopamine (DA) function and the hypothalamo-pituitary-adrenal (HPA) axis in OCD.
• To evaluate cortisol (CORT) responses to apomorphine (APO) stimulation in OCD patients and controls.

Main Methods:

• 15 patients with OCD and 15 age-sex matched controls participated.
• Cortisol (CORT) responses were measured after stimulation with the dopamine (DA) agonist apomorphine (APO).
• Cortisol (CORT) response to saline administration was assessed to control for circadian variations.

Main Results:

• Basal cortisol levels were similar between OCD patients and controls.
• Cortisol levels after saline administration were significantly higher in OCD patients.
• Apomorphine (APO)-induced cortisol rises were higher in OCD patients, but this difference disappeared after correcting for saline response.

Conclusions:

• The study suggests no alterations in central dopaminergic function related to HPA axis regulation in OCD.
• Obsessive compulsive disorder (OCD) pathogenesis may not involve central dopaminergic dysfunction impacting the HPA axis.
• Further research is needed to fully elucidate the neurobiology of OCD.