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Cortical glutamatergic markers in schizophrenia
Elizabeth Scarr1, Monica Beneyto, James H Meador-Woodruff
1Rebecca L Cooper Research Laboratories, The Mental Health Research Institute of Victoria, Parkville, Australia. escarr_mhri@iprimus.com.au
Summary
Schizophrenia is linked to reduced kainate receptors in the brain, specifically the GluR5 subunit. This finding may explain abnormal glutamatergic function in the disorder.
Area of Science:
- Neuroscience
- Psychiatry
- Molecular Biology
Background:
- Cortical glutamatergic markers in schizophrenia lack consistent post-mortem findings.
- Abnormal glutamatergic function is implicated in schizophrenia pathology.
- Understanding these changes is crucial for comprehending the disorder.
Purpose of the Study:
- To investigate alterations in cortical glutamatergic markers in schizophrenia.
- To measure ionotropic glutamate receptor binding and kainate receptor mRNA levels.
- To clarify the role of glutamatergic dysfunction in schizophrenia.
Main Methods:
- Post-mortem dorsolateral prefrontal cortex tissue from 20 schizophrenia patients and 20 controls.
- In situ radioligand binding assays for NMDA, AMPA, kainate receptors, and glutamate uptake sites.
- In situ hybridization to quantify kainate receptor mRNA levels (GluR5, GluR6, GluR7, KA1, KA2).
Main Results:
- Significantly decreased [3H]kainate binding observed across cortical laminae in schizophrenia subjects.
- No significant differences in [3H]MK-801, [3H]AMPA, [3H]aspartate, or [3H]CGP39653 binding.
- Reduced mRNA levels for the GluR5 subunit, but not other kainate receptor subunits, were found.
Conclusions:
- Decreased kainate receptor binding in the dorsolateral prefrontal cortex of schizophrenia patients.
- Reduced expression of GluR5 receptor subunits may underlie the observed decrease in kainate receptors.
- These findings contribute to understanding glutamatergic system abnormalities in schizophrenia.