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Alterations in cell adhesion molecule L1 and functionally related genes in major depression: a postmortem study
Daphna Laifenfeld1, Rachel Karry, Ehud Klein
1Laboratory of Psychobiology, The Department of Psychiatry, Rambam Medical Center, and B. Rappaport Faculty of Medicine, Technion IIT, Haifa, Israel.
Biological Psychiatry
|April 12, 2005
Summary
Cell adhesion molecule L1 (CAM-L1) and phosphorylated CREB (pCREB) levels were altered in the brains of depressed individuals. These findings suggest CAM-L1
Area of Science:
- Neuroscience
- Molecular Psychiatry
- Genetics
Background:
- Depression research focuses on genes affecting neuronal plasticity.
- Antidepressants increase cell adhesion molecule L1 (CAM-L1), laminin, and CREB; stress decreases them.
- Hypothesized CAM-L1, CREB, and laminin are altered in depressed brains.
Purpose of the Study:
- Investigate alterations in CAM-L1, CREB, and laminin in post-mortem brains of depressed subjects.
- Examine gene expression differences in specific brain regions (prefrontal and parieto-occipital cortices).
- Correlate gene expression with depression and antidepressant treatment status.
Main Methods:
- Analyzed 59 post-mortem brains (depressed, bipolar, schizophrenic, controls) from the Stanley Foundation Brain Collection.
- Quantified mRNA and protein levels using RT-PCR and Western blot analysis.
- Focused on prefrontal and ventral parieto-occipital cortices.
Main Results:
- Increased CAM-L1 and phosphorylated CREB (pCREB) in the prefrontal cortex of depressed subjects.
- Decreased CAM-L1, laminin, and pCREB in the parieto-occipital cortex.
- Antidepressant use correlated with differential expression of CAM-L1, laminin, and pCREB in specific brain regions.
Conclusions:
- Specific alterations in CAM-L1 expression observed in depression and antidepressant treatment.
- CAM-L1 may play a significant role in the pathophysiology and treatment of depression.
- Findings highlight the involvement of CAM-L1 in depression's biological mechanisms.