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Published on: July 25, 2011

Post-insult valproic acid-regulated microRNAs: potential targets for cerebral ischemia

Joshua G Hunsberger, Emily B Fessler, Zhifei Wang

    American Journal of Translational Research
    |September 1, 2012
    PubMed

    Insights

    Valproic acid (VPA) improves neurological function after stroke by regulating microRNAs (miRNAs). This study identifies specific miRNAs involved in stroke pathology and VPA

    Area of Science:

    • Neuroscience and Molecular Biology
    • Biomedical Research
    • Genetics and Genomics

    Background:

    • Stroke is a major cause of disability with limited therapeutic options.
    • MicroRNAs (miRNAs) are small non-coding RNAs implicated in various biological processes, including neurological disorders.
    • Understanding miRNA dysregulation in stroke is crucial for developing novel treatments.

    Purpose of the Study:

    • To profile microRNAs (miRNAs) in the ischemic cortex following middle cerebral artery occlusion (MCAO) in a rat model.
    • To investigate the effects of valproic acid (VPA) treatment on miRNA expression and neurological deficits post-stroke.
    • To identify potential miRNA targets and pathways involved in stroke recovery and VPA's therapeutic effects.

    Main Methods:

    • Utilized a rat model of middle cerebral artery occlusion (MCAO) to induce experimental stroke.
    • Employed quantitative PCR (qPCR) to confirm miRNA upregulation post-MCAO.
    • Administered valproic acid (VPA) post-stroke and profiled regulated miRNAs, including miR-331 and miR-885-3p.
    • Used Ingenuity Pathway Analysis (IPA) to predict miRNA targets and associated disease networks.

    Main Results:

    • Several miRNAs, including miR-155, miR-297a, miR-466f, miR-466h, and miR-1224, were significantly upregulated 24 hours post-MCAO.
    • VPA treatment improved neurological deficits and motor performance in MCAO rats.
    • VPA regulated specific miRNAs, with miR-331 and miR-885-3p identified as promising candidates.
    • IPA analysis revealed that predicted miRNA targets are involved in nervous system development and associated with neurological diseases.

    Conclusions:

    • MicroRNAs play a significant role in the pathological mechanisms of stroke.
    • Valproic acid (VPA) demonstrates therapeutic potential for stroke by modulating miRNA expression.
    • Further research into miRNA mechanisms and targets could lead to new therapeutic strategies for neurological disorders.
    Keywords:
    Cerebral ischemiamicroRNAneuroprotectionoxygen-glucose deprivationvalproic acid

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