Related Experiment Videos
The cAMP-dependent protein kinase substrate Rap1 in platelets from patients with obsessive compulsive disorder or
1Center of Neuropharmacology, Institute of Pharmacological Sciences, University of Milan, Milan, Italy.
Abstract:
Previous studies have reported that the cAMP-dependent protein kinase and one of its substrates, namely Rap1, are altered in patients with affective disorders. Abnormalities in the cAMP-dependent protein kinase have also been reported in platelets of patients with obsessive compulsive disorder and schizophrenia. However, it remains to be determined whether abnormalities in Rap1 are specifically related to affective disorders or may also be present in schizophrenia and obsessive compulsive disorder. Thus, we investigated Rap1 in platelets from 12 drug-free patients with obsessive compulsive disorder, ten drug-free patients with schizophrenia, and 20 healthy subjects. While no difference was observed in the levels of Rap1 between groups, the phosphorylation state of Rap1 was significantly lower in patients with obsessive compulsive disorder than in schizophrenic patients and controls. These data further support the idea that abnormalities of cAMP signalling pathway could be associated, albeit in a somewhat different way, with several psychiatric disorders.
Insights
Altered Rap1 phosphorylation, a key signaling molecule, was observed in patients with obsessive compulsive disorder, suggesting broader links between cAMP pathway dysfunction and psychiatric conditions beyond affective disorders.
Area of Science:
- Neuroscience
- Molecular Psychiatry
- Biochemistry
Background:
- Previous research linked cAMP-dependent protein kinase and Rap1 to affective disorders.
- Abnormalities in cAMP-dependent protein kinase are also noted in schizophrenia and obsessive compulsive disorder (OCD).
Purpose of the Study:
- To determine if Rap1 abnormalities are specific to affective disorders or also present in schizophrenia and OCD.
- Investigate Rap1 levels and phosphorylation in drug-free patients with OCD and schizophrenia compared to healthy controls.
Main Methods:
- Collected platelet samples from 12 drug-free OCD patients, 10 drug-free schizophrenia patients, and 20 healthy controls.
- Analyzed Rap1 protein levels and its phosphorylation state in the collected samples.
Main Results:
- No significant differences in Rap1 protein levels were found across the groups.
- Rap1 phosphorylation was significantly lower in patients with OCD compared to schizophrenia patients and healthy controls.
Conclusions:
- These findings suggest that altered Rap1 phosphorylation is associated with OCD.
- The study supports the hypothesis that cAMP signaling pathway abnormalities are implicated in various psychiatric disorders, including OCD and schizophrenia, though potentially through distinct mechanisms.