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Rapid Increase of Nurr1 MRNA Expression in Limbic and Cortical Brain Structures Related to Coping with Depression-like Behavior in Mice

Overview
Journal J Neurosci Res
Specialty Neurology
Date 2010 Feb 23
PMID 20175204
Citations 16
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Abstract

The immediate-early gene Nurr1 is a member of the inducible orphan nuclear receptor family. Nurr1 is essential to the differentiation, maturation, and maintenance of midbrain dopaminergic neurons and is expressed in different brain regions. We have reported that adult mice with reduced Nurr1 expression displayed an increase in immobility response to acute stress. These mice were also deficient in the retention of emotional memory. Thus, Nurr1 expression seems to be relevant to normal cognitive processes. To investigate the response of Nurr1 to a stress stimulus, Nurr1 mRNA expression was examined by in situ hybridization in adult mice using a depression-like behavior paradigm, the forced swim test. The Nurr1 gene was rapidly and widely up-regulated throughout the brain, including cortical areas (i.e., prefrontal cortex, primary and secondary visual cortex, primary auditory cortex, and secondary somatosensory cortex), hippocampus (dentate gyrus, CA1, CA2, and CA3), and midbrain (substantia nigra pars compacta and ventral tegmental area) at 30 min and 3 hr after the forced swim test. Dopamine content was reduced in prefrontal cortex and midbrain following swim stress. These results suggest that the increase in Nurr1 expression might be a compensatory mechanism to counteract the changes in forebrain dopamine transmission in coping with acute stress.

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