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Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue
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PTEN Regulates Myofibroblast Activation in Valvular Interstitial Cells based on Subcellular Localization.

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    The tumor suppressor PTEN protects against aortic valve stenosis (AVS) by preventing valvular interstitial cell activation. PTEN promotes a quiescent fibroblast phenotype, suggesting it is a potential therapeutic target for AVS.

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    Area of Science:

    • Cardiovascular Biology
    • Cellular Biology
    • Fibrosis Research

    Background:

    • Aortic valve stenosis (AVS) involves disrupted aortic valve mechanics and left ventricle hypotrophy.
    • Activation of valvular interstitial cells (VICs) into myofibroblasts, marked by αSMA, is a key feature of AVS.
    • The tumor suppressor PTEN's role in tissue fibrosis suggests its potential involvement in AVS.

    Purpose of the Study:

    • To investigate the role of PTEN in regulating myofibroblast activation in VICs.
    • To determine if PTEN acts as a protective factor against matrix-induced VIC activation in AVS.
    • To explore PTEN's potential as a therapeutic target for AVS.

    Main Methods:

    • Analysis of PTEN levels in human aortic valve samples (healthy vs. diseased).
    • Pharmacological and genetic manipulation of PTEN in VIC cultures.
    • Assessment of myofibroblast activation markers and nuclear PTEN localization under varying matrix stiffness.

    Main Results:

    • Human diseased aortic valves showed lower PTEN levels compared to healthy valves.
    • PTEN overexpression inhibited stiffness-induced VIC myofibroblast activation.
    • PTEN inhibition exacerbated myofibroblast activation.
    • Increased nuclear PTEN localization correlated with smaller nuclei, altered histone expression, and a quiescent fibroblast phenotype.

    Conclusions:

    • PTEN suppresses VIC activation and promotes fibroblast quiescence in the context of AVS.
    • Reduced PTEN levels are associated with AVS pathology.
    • PTEN represents a potential pharmacological target for treating aortic valve stenosis.