Differential Ceramide Metabolism in Autogenous and Reactive Obsessions: A Biomarker Perspective in OCD

Area of Science:

• Neuroscience
• Biochemistry
• Metabolomics

Background:

• Obsessive-compulsive disorder (OCD) is a complex neuropsychiatric condition.
• Understanding the neurobiological underpinnings of OCD subtypes is crucial for targeted treatments.
• Ceramide pathway metabolites play roles in various cellular functions and have been implicated in neurological disorders.

Purpose of the Study:

• To compare ceramide pathway metabolite levels between autogenous obsession (AO) and reactive obsession (RO) subtypes of OCD patients and healthy controls (HC).
• To investigate potential differences in sphingolipid metabolism associated with OCD heterogeneity.

Main Methods:

• Targeted lipid analysis of serum samples from 52 OCD patients and 27 HC using liquid chromatography-mass spectrometry.
• Measurement of specific ceramide pathway metabolites including C24:1 ceramide, hydroxy-ceramides (C24:0, C18:0), sphingomyelin (SM 16:0), and sphingosine-1-phosphate (S1P).
• Subgrouping of OCD patients into AO and RO based on primary obsessions.

Main Results:

• Significantly elevated levels of C18:0 hydroxy-ceramide and S1P in OCD patients compared to HC.
• OCD patients with AO exhibited significantly higher C24:1 ceramide levels than those with RO and HC.
• Positive correlations were observed between various ceramide pathway metabolites within the OCD group.

Conclusions:

• Elevated C24:1 ceramide in AO-OCD patients may serve as a novel biomarker, reflecting neurobiological heterogeneity.
• The study underscores the involvement of ceramide pathway metabolites in OCD pathophysiology.
• Findings provide new insights into the molecular mechanisms underlying different OCD subtypes.