Reduction of dopamine-related transcription factors Nurr1 and NGFI-B in the prefrontal cortex in schizophrenia and bipolar disorders

Schizophrenia Research
Guoqiang XingRobert Post

Abstract

Abnormal cortical and subcortical dopaminergic activities are among the most consistent neuropathological findings in schizophrenia. The molecular mechanisms remain unspecified. NGFI-B and Nurr1 are two closely related transcription factors involved in dopaminergic cell differentiation, maturation, and apoptosis. NGFI-B knockout mice show attenuated behavioral response to dopamine receptor agonists, whereas Nurr1 knockout disrupts midbrain dopaminergic neuron development. To further understand the role of Nurr1 and NGFI-B in schizophrenia and bipolar disorders, we measured Nurr1 and NGFI-B mRNA in the prefrontal cortex Brodmann's areas 9 (BA 9) and BA 46 by in situ hybridization, and the protein levels in BA 9 by Western blotting, of patients with schizophrenia, major depression, and bipolar disorders, and non-psychiatric control subjects (n=15 per group). NGFI-B mRNA (P<0.05) and protein (P<0.01) were significantly lower in patients with schizophrenia (BA 9), and NGFI-B mRNA was lower in bipolar disorder (BA 9 and BA 46) than in the controls. In the deep cortical layers of BA 46, Nurr1 mRNA was significantly (P<0.05) lower in patients with bipolar disorder and schizophrenia than in the controls. Nurr1 protein in BA 9 was signi...Continue Reading

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