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Reductions in cholesterol and synaptic markers in association cortex in mood disorders
Clare L Beasley1, William G Honer, Klaus Bergmann
1Center for Complex Disorders, Department of Psychiatry, University of British Columbia, Vancouver, Canada. cbeasley@interchange.ubc.ca
Bipolar Disorders
|September 24, 2005
Summary
Brain cholesterol levels are reduced in major depressive disorder and bipolar disorder, alongside synaptic deficits. These findings suggest cholesterol and synapse changes may characterize mood disorders.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Cholesterol is crucial for cell membranes, myelin, and synapse function.
- Low serum cholesterol is linked to mood disorders, but brain cholesterol levels in these conditions are unknown.
Purpose of the Study:
- To quantify brain cholesterol and related sterols in major psychiatric disorders.
- To correlate brain sterol levels with myelin and synaptic markers.
Main Methods:
- Postmortem brain samples (visual association cortex) from patients with bipolar disorder (BPD), major depressive disorder (MDD), schizophrenia (SCZ), and controls (n=15 each).
- Gas-liquid chromatography for cholesterol, precursors (lathosterol, desmosterol, lanosterol), and metabolite (24S-hydroxycholesterol).
- ELISA for myelin basic protein (MBP), synaptophysin, and VAMP.
Main Results:
- Cholesterol levels were significantly lower in MDD (13%) and BPD (10%) compared to controls.
- No differences in cholesterol precursors or metabolites were observed.
- Synaptophysin and VAMP (synaptic markers) were reduced in BPD and MDD.
- Myelin basic protein (MBP) levels remained unchanged.
Conclusions:
- Reduced brain cholesterol and synaptic deficits may be characteristic features of mood disorders.
- These findings highlight the role of cholesterol in the neurobiology of mood disorders.
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