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Decreased prefrontal CaMKII alpha mRNA in bipolar illness
Guoqiang Xing1, Shani Russell, Christopher Hough
1Department of Psychiatry, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814, USA.
Abstract:
Ca2+/calmodulin-dependent protein kinase II (CaMKII) plays critical roles in neurotransmission, synaptic plasticity, learning and memory. The aim of this study was to examine, by in situ hybridization, prefrontal cortical expression of CaMKII alpha mRNA in postmortem brains of unipolar, bipolar, schizophrenic, and control subjects. Compared to controls, bipolar patients had significantly lower levels of CaMKII alpha mRNA in laminae I-VI of Brodmann's area 9 and laminae I-III and VI of area 46. Unipolar patients also exhibited significantly lower levels of CaMKII alpha mRNA in laminae I-IV of area 9 than did controls. The significant decrease in CaMKII alpha mRNA in bipolar patients could be associated with some of the affective and cognitive alterations that have been linked to prefrontal cortical dysfunction in bipolar disorder, although this requires further direct examination.
Insights
Bipolar and unipolar patients show reduced CaMKII alpha mRNA in the prefrontal cortex, impacting learning and memory. This suggests a link between CaMKII gene expression and mood disorders.
Area of Science:
- Neuroscience
- Molecular Psychiatry
- Neurogenetics
Background:
- Calcium/calmodulin-dependent protein kinase II (CaMKII) is crucial for synaptic plasticity, learning, and memory.
- Dysregulation of CaMKII has been implicated in various neurological and psychiatric disorders.
- Prefrontal cortical (PFC) dysfunction is a hallmark of several mood disorders.
Purpose of the Study:
- To investigate the expression levels of CaMKII alpha mRNA in the postmortem prefrontal cortex of individuals with unipolar depression, bipolar disorder, schizophrenia, and healthy controls.
- To determine if alterations in CaMKII alpha mRNA expression correlate with specific psychiatric diagnoses.
Main Methods:
- In situ hybridization was employed to quantify CaMKII alpha mRNA expression in postmortem brain tissue.
- Postmortem brains from unipolar, bipolar, schizophrenic, and control subjects were analyzed.
- Specific Brodmann areas (9 and 46) and cortical laminae were examined.
Main Results:
- Bipolar patients exhibited significantly lower CaMKII alpha mRNA levels in Brodmann's area 9 (laminae I-VI) and area 46 (laminae I-III and VI) compared to controls.
- Unipolar patients showed significantly reduced CaMKII alpha mRNA levels in Brodmann's area 9 (laminae I-IV) relative to controls.
- No significant differences were reported for schizophrenic patients in the examined regions.
Conclusions:
- Reduced CaMKII alpha mRNA expression in the prefrontal cortex of bipolar and unipolar patients may contribute to cognitive and affective deficits.
- These findings highlight the potential role of CaMKII in the pathophysiology of mood disorders.
- Further research is needed to directly link CaMKII alterations to specific clinical symptoms and prefrontal cortical dysfunction.