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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation

Published on: May 31, 2016

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A molecular target of vascular calcification in chronic kidney disease

Mohamed G Atta

    The Journal of Clinical Investigation
    |January 4, 2022
    PubMed

    Insights

    SIRT6 protein prevents vascular calcification in chronic kidney disease (CKD) by inhibiting the osteogenic transdifferentiation of vascular smooth muscle cells (VSMCs). This research identifies SIRT6 as a potential therapeutic target for treating vascular calcification in CKD patients.

    Area of Science:

    • Nephrology
    • Cardiovascular Biology
    • Molecular Medicine

    Background:

    • Vascular calcification (VC) is a significant complication in chronic kidney disease (CKD), leading to increased cardiovascular morbidity and mortality, especially in end-stage kidney disease (ESKD) patients on dialysis.
    • The precise molecular mechanisms underlying VC in CKD remain incompletely understood, necessitating further investigation into potential therapeutic targets.

    Purpose of the Study:

    • To elucidate the molecular mechanism by which SIRT6 exerts a protective role against vascular calcification (VC) in the context of chronic kidney disease (CKD).
    • To investigate the potential of targeting SIRT6 as a therapeutic strategy for managing VC in CKD patients.

    Main Methods:

    • Employed in vitro and animal models specifically designed to mimic conditions of chronic kidney disease (CKD).
    • Investigated the interaction between SIRT6 and the transcription factor Runx2 (runt-related transcription factor 2).
    • Utilized techniques to assess protein deacetylation, nuclear export, and proteasomal degradation pathways.

    Main Results:

    • Demonstrated that SIRT6 effectively prevents vascular calcification (VC) by suppressing the osteogenic transdifferentiation of vascular smooth muscle cells (VSMCs).
    • Mechanistically, SIRT6 was shown to bind and deacetylate Runx2, a critical transcription factor for osteogenic differentiation.
    • This SIRT6-mediated deacetylation promotes the nuclear export and subsequent proteasomal degradation of Runx2, thereby inhibiting VC.

    Conclusions:

    • The study identifies a novel molecular pathway in the pathogenesis of vascular calcification (VC) relevant to chronic kidney disease (CKD).
    • SIRT6 plays a crucial protective role in preventing VC by regulating VSMC osteogenic transdifferentiation via the Runx2 pathway.
    • These findings strongly support the investigation of SIRT6 as a potential therapeutic target for mitigating vascular calcification in CKD.

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