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Inositol Hexaphosphate (InsP6) Activates the HDAC1/3 Epigenetic Axis to Maintain Intestinal Barrier Function.

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    Inositol polyphosphate multikinase (IPMK) activates histone deacetylases (HDAC1/3), crucial for gene regulation. This discovery reveals IPMK

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    Area of Science:

    • Epigenetics
    • Molecular Biology
    • Biochemistry

    Background:

    • Histone deacetylases (HDACs) are critical regulators of gene expression with therapeutic potential in cancer.
    • Understanding HDAC activation mechanisms is vital for developing targeted therapies.
    • The specific role of inositol polyphosphate multikinase (IPMK) in HDAC regulation was previously unclear.

    Purpose of the Study:

    • To investigate the role of IPMK in the activation of HDAC1 and HDAC3.
    • To elucidate the functional consequences of disrupting the IPMK-HDAC1/3 interaction on gene expression and cellular functions.
    • To explore the therapeutic potential of targeting the IPMK-HDAC axis.

    Main Methods:

    • Utilized cell lines and mouse models with IPMK deletion or inactivated kinase activity.
    • Assessed HDAC1/3 deacetylase activity and downstream gene expression changes.
    • Analyzed cell and intestinal permeability, and the effect of inositol hexaphosphate (InsP6) treatment.

    Main Results:

    • IPMK is essential for activating HDAC1 and HDAC3 deacetylase activity.
    • IPMK inactivation leads to impaired HDAC1/3 activity, altered gene expression, and increased matrix metalloproteinase (MMP) gene transcription.
    • Disruption of the IPMK-HDAC1/3 axis increases cell and intestinal permeability, which is rescued by InsP6 treatment.

    Conclusions:

    • IPMK's kinase activity is indispensable for activating HDAC1/3.
    • The IPMK-HDAC1/3 pathway critically regulates intestinal barrier function.
    • Targeting IPMK offers a potential therapeutic strategy for conditions involving impaired intestinal permeability.