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Attenuation of Postischemic Genomic Alteration by Mesenchymal Stem Cells: a Microarray Study.

Chunggab Choi1, Seung-Hun Oh2, Jeong-Eun Noh1

  • 1Department of Biomedical Science, CHA University, Seongnam 463-400, Korea.

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Intravenous administration of mesenchymal stem cells (IV-MSC) therapy for stroke attenuated genomic alterations in the ischemic rat brain. This therapy reduced inflammation and cell cycle dysregulation, contributing to its protective effects.

Keywords:
inflammationmesenchymal stem cellsmicroarraystroketranscriptome

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Genomics

Background:

  • Mesenchymal stem cells (MSCs) administered intravenously (IV-MSC) show neuroprotective effects in stroke models.
  • The precise molecular mechanisms behind IV-MSC therapy's efficacy remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms of IV-MSC therapy in a rat stroke model using transcriptome analysis.
  • To identify genomic profile changes and affected pathways in the ischemic brain following IV-MSC treatment.

Main Methods:

  • Rats underwent transient middle cerebral artery occlusion (MCAo) and were treated with IV-MSC or saline.
  • mRNA microarray analysis was performed on brain tissue at 72 hours post-MCAo.
  • Differentially expressed genes (DEGs) were analyzed for pathway enrichment, alongside functional tests and immunohistochemistry.

Main Results:

  • Cerebral ischemia induced significant gene expression changes, primarily related to inflammation and cell cycle pathways.
  • IV-MSC treatment significantly attenuated the number of dysregulated genes compared to sham treatment.
  • IV-MSC therapy reduced inflammatory markers (Iba-1+ cells), decreased infarct size, and improved functional recovery.

Conclusions:

  • Transcriptome analysis reveals that IV-MSC therapy mitigates post-ischemic genomic alterations in the brain.
  • The therapeutic benefits of IV-MSC for cerebral ischemia involve the amelioration of dysregulated inflammation and cell cycle gene expression in the host brain.