Abstract
Patients with schizophrenia have reduced neurotrophin levels in their dorsolateral prefrontal cortex (DLPFC) compared to normal unaffected individuals. The tyrosine kinase-containing receptors, trkB and trkC, mediate the growth-promoting effects of neurotrophins and respond to changes in growth factor availability. We hypothesized that trkB and/or trkC expression would be altered in the DLPFC of patients with schizophrenia. We measured mRNA encoding the tyrosine kinase domain (TK+)-containing form of trkB and measured pan trkC mRNA in schizophrenics (N=14) and controls (N=15) using in situ hybridization. TrkB and trkC mRNAs were detected in large and small neurons in multiple cortical layers of the human DLPFC. We found significantly diminished expression of trkBTK+ mRNA in large neurons in multiple cortical layers of patients as compared to controls, while small neurons also showed reductions in trkBTK+ mRNA that did not reach statistical significance. In normals, strong positive correlations were found between trkBTK+ mRNA levels and brain-derived neurotrophic factor (BDNF) mRNA levels among various neurons, while no correlation between BDNF and trkBTK+ was found in patients with schizophrenia. TrkC mRNA was also reduced in the DLPFC of schizophrenics in large neurons in layers II, III, V and VI and in small neurons in layer IV. Since neurons in the DLPFC integrate and communicate signals to various cortical and subcortical regions, these reductions in growth factor receptors may compromise the function and plasticity of the DLPFC in schizophrenia.
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Acknowledgements
We thank the following people who assisted in this research project: Juraj Cervenak MD, Sarah Colvin, MD, Robert Fatula, Subroto Ghose, MD, PhD, and Yeva Snitkovsky.
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Weickert, C., Ligons, D., Romanczyk, T. et al. Reductions in neurotrophin receptor mRNAs in the prefrontal cortex of patients with schizophrenia. Mol Psychiatry 10, 637–650 (2005). https://doi.org/10.1038/sj.mp.4001678
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DOI: https://doi.org/10.1038/sj.mp.4001678
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