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Transcriptomic Modification in the Cerebral Cortex following Noninvasive Brain Stimulation: RNA-Sequencing Approach.

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|January 26, 2017
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Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) alters gene expression in the rat brain, impacting pathways related to inflammation and neurotransmitter signaling. These molecular changes are intensity-dependent, revealing mechanisms behind tDCS effects.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Transcranial direct current stimulation (tDCS) is known to modulate neuroplasticity and shows therapeutic potential for psychiatric disorders.
  • The molecular mechanisms underlying tDCS effects remain largely unexplored.
  • Understanding gene expression changes is crucial for elucidating tDCS's impact on brain function.

Purpose of the Study:

  • To investigate the effects of anodal tDCS on gene expression in the rat cerebral cortex.
  • To determine if tDCS-induced gene expression changes are dependent on stimulation intensity.
  • To identify specific molecular pathways affected by tDCS.

Main Methods:

  • Anodal transcranial direct current stimulation (tDCS) was applied to rats at three distinct intensities.
  • RNA-sequencing was performed on cerebral cortex tissue from stimulated and sham groups.
  • Statistical analysis was used to identify differentially expressed genes and affected pathways.

Main Results:

  • Approximately 1,000 genes showed statistically significant expression changes compared to the sham group at each tested intensity.
  • tDCS significantly altered various functional pathways, biological processes, and molecular categories.
  • Affected pathways included those related to inflammation, antidepressant action (GTP signaling, calcium ion binding, transmembrane/signal peptide), and neurotransmitter receptor signaling (serotonergic, adrenergic, GABAergic, dopaminergic, glutamatergic).
  • Gene expression changes varied in a current intensity-dependent manner, with some alterations observed across multiple intensities and others unique to specific intensities.

Conclusions:

  • Transcranial direct current stimulation (tDCS) demonstrably modifies gene expression profiles in the rat cerebral cortex.
  • The observed alterations in gene expression are dependent on the intensity of the tDCS applied.
  • These findings provide insights into the molecular underpinnings of tDCS, highlighting its impact on key signaling and inflammatory pathways.