Is obsessive-compulsive disorder caused by a second-messenger imbalance?

Area of Science:

• Neuroscience
• Psychiatry
• Molecular Biology

Background:

• Obsessive-compulsive disorder (OCD) is a common psychiatric condition with an unknown etiology.
• Existing research suggests the involvement of the serotonin (5-HT) transporter in OCD.
• Studies indicate reduced platelet 5-HT transporter functionality in OCD patients.

Purpose of the Study:

• To investigate the roles of protein kinase C (PKC) and protein kinase A (PKA) in OCD.
• To propose a unifying hypothesis for the underlying molecular mechanisms of OCD.

Main Methods:

• Combined data from two independent studies of OCD patients.
• Assessed the activity levels of PKC and PKA in patient samples.

Main Results:

• Observed increased activity of protein kinase C (PKC) in OCD patients.
• Observed decreased activity of protein kinase A (PKA) in OCD patients.

Conclusions:

• Hypothesize that OCD may result from an imbalance between PKC and PKA signaling pathways.
• Suggests a prevalence of the phosphoinositide pathway over the cyclic adenosine monophosphate (cAMP) pathway in OCD.
• This hypothesis opens avenues for novel therapeutic interventions for OCD.