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Antidepressant treatments change 5-HT2C receptor mRNA expression in rat prefrontal/frontal cortex and hippocampus

Alessandro Barbon1, Cesare Orlandi, Luca La Via

  • 1Division of Biology and Genetics, Department of Biomedical Sciences and Biotechnologies and National Institute of Neuroscience, University of Brescia, Brescia, Italy.

Neuropsychobiology
|January 14, 2011
PubMed
Abstract

Insights

Antidepressants alter serotonin 2C receptor mRNA expression in rat brains, with region-specific and time-dependent effects. RNA editing levels showed minimal changes, suggesting expression modulation is key.

Area of Science:

  • Neuroscience
  • Molecular Psychiatry

Background:

  • The serotonin 2C receptor (5-HTR2C) is implicated in affective disorders and antidepressant action.
  • Antidepressant treatments can modulate neurotransmitter receptor systems.

Purpose of the Study:

  • To investigate the impact of chronic fluoxetine and reboxetine treatment on 5-HTR2C mRNA expression and RNA editing in rat prefrontal cortex and hippocampus.
  • To determine the time course of these changes during treatment and withdrawal.

Main Methods:

  • Chronic administration of fluoxetine and reboxetine to rats.
  • Quantitative analysis of 5-HTR2C mRNA expression levels using RT-PCR.
  • Assessment of 5-HTR2C RNA editing at specific sites (A, B, C, C', D).

Main Results:

  • Both fluoxetine and reboxetine led to a significant down-regulation of 5-HTR2C mRNA in the prefrontal/frontal cortex, persisting after drug withdrawal.
  • In the hippocampus, reboxetine caused down-regulation, while fluoxetine induced significant up-regulation of 5-HTR2C mRNA.
  • No significant alterations in overall 5-HTR2C RNA editing frequency were observed, though minor decreases at C' and D sites were noted with reboxetine.

Conclusions:

  • Chronic antidepressant treatment significantly influences 5-HTR2C mRNA expression in a brain area- and time-specific manner.
  • RNA editing of the 5-HT2C receptor is only slightly affected by these antidepressant treatments.
  • These findings highlight the complex regulation of 5-HTR2C by antidepressants, primarily at the mRNA expression level.

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