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Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
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Chronic nicotine doses down-regulate PDE4 isoforms that are targets of antidepressants in adolescent female rats

Oksana O Polesskaya1, Robert F Smith, Karl J Fryxell

  • 1Center for Biomedical Genomics & Informatics, Department of Molecular & Microbiology, George Mason University, Manassas, Virginia 20110, USA.

Biological Psychiatry
|July 4, 2006
PubMed
Abstract

Insights

Chronic nicotine use in adolescent female rats down-regulates the phosphodiesterase 4B (PDE4B) gene, potentially offering antidepressant effects and linking nicotine dependence to gene expression. This research explores smoking cessation and mental health connections.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Genetics

Background:

  • Nicotine dependence, anxiety, and depression are interconnected, influencing smoking behavior.
  • Clinical studies confirm these links, leading to FDA-approved antidepressants like Zyban for smoking cessation.
  • Certain antidepressants, such as rolipram, function by inhibiting phosphodiesterases (PDEs).

Purpose of the Study:

  • To investigate gene expression changes in adolescent female rats exposed to chronic nicotine.
  • To explore the relationship between nicotine treatment and phosphodiesterase 4B (PDE4B) gene expression in the brain.

Main Methods:

  • DNA microarrays were employed to identify gene expression alterations.
  • Real-time PCR assays were utilized to validate and expand upon microarray findings.

Main Results:

  • A consistent decrease in Pde4b mRNA levels was observed in the nucleus accumbens, prefrontal cortex, and hippocampus of rats treated with nicotine.
  • Nicotine treatment at both .24 mg/day and .12 mg/day resulted in down-regulation of Pde4b in specific brain regions.
  • Different brain areas exhibited distinct Pde4b isoform expression profiles.

Conclusions:

  • Chronic nicotine administration induces a dose-dependent down-regulation of the Pde4b gene, suggesting a potential antidepressant effect.
  • This study establishes a novel link between nicotine dependence and phosphodiesterase gene expression.
  • Findings contribute to understanding the complex interplay between smoking, schizophrenia, and PDE4B gene mutations.

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