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Matrix metalloproteinase 9 expression: new regulatory elements

Irina Surgucheva, Kumaravel Chidambaram, David A Willoughby

    Journal of Ocular Biology, Diseases, and Informatics
    |August 6, 2011
    PubMed

    Insights

    This study reveals a new microRNA (miRNA) mechanism regulating matrix metalloproteinase 9 (MMP-9) expression. Understanding this miRNA-MMP-9 link is crucial for glaucoma pathogenesis research.

    Area of Science:

    • Molecular Biology
    • Ophthalmology
    • Cell Biology

    Background:

    • Retinal ganglion cell apoptosis is linked to matrix metalloproteinase 9 (MMP-9) and extracellular matrix changes.
    • Abnormal MMP-9 expression is implicated in glaucomatous alterations, highlighting the need to understand its regulation in glaucoma pathogenesis.

    Purpose of the Study:

    • To investigate the role of 3'-untranslated regions (3'-UTR) and microRNAs (miRNAs) in regulating MMP-9 expression.
    • To identify specific miRNAs and their binding sites within the MMP-9 3'-UTR involved in gene expression control.

    Main Methods:

    • In vitro mutagenesis and a luciferase reporter system were employed to identify regulatory elements in the MMP-9 3'-UTR.
    • Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to analyze miRNA expression.
    • miRNA inhibitors and mimics were utilized to confirm the regulatory role of identified miRNAs, including miR-340.

    Main Results:

    • Specific miRNA target sites within the MMP-9 3'-UTR were identified, mediating MMP-9 expression.
    • The study confirmed the regulatory function of miR-340 in controlling MMP-9 expression in optic nerve astrocytes and 293 T cells.

    Conclusions:

    • A novel miRNA-mediated regulatory mechanism for MMP-9 expression has been elucidated.
    • This finding provides new insights into the pathogenesis of glaucoma and potential therapeutic targets.
    Keywords:
    Extracellular matrixMatrix metalloproteinasesMicroRNARetinal ganglion cellsUntranslated region

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