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Epigenetic changes during mechanically induced osteogenic lineage commitment.

Julia C Chen, Mardonn Chua, Raymond B Bellon

    Journal of Biomechanical Engineering
    |January 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Mechanical stimulation via fluid shear stress rapidly enhances osteogenic differentiation by altering DNA methylation patterns. This epigenetic reprogramming promotes the expression of late-stage osteogenic markers in progenitor cells.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Epigenetics

    Background:

    • Osteogenic lineage commitment is typically assessed via gene expression, but transient gene expression poses limitations.
    • Epigenetic modifications, particularly DNA methylation, offer a stable, heritable marker for lineage evaluation.
    • Mechanical stimuli like fluid shear stress can influence cellular differentiation pathways.

    Purpose of the Study:

    • To investigate the impact of mechanical stimulation on osteogenic differentiation using DNA methylation as a stable readout.
    • To determine if fluid shear stress alters epigenetic states and gene expression in progenitor cells.

    Main Methods:

    • Osteocytes were subjected to fluid shear stress for 24 hours.
    • Osteocyte-conditioned medium (CM) was applied to progenitor cells.
    • Gene expression and DNA methylation changes were analyzed using quantitative real-time polymerase chain reaction and bisulfite sequencing after 24-hour CM exposure.

    Main Results:

    • Fluid shear stress stimulation led to decreased DNA methylation for both adipogenic and osteogenic markers.
    • Exposure to CM rapidly increased the expression of late-stage osteogenic markers, typically seen after prolonged biochemical induction.
    • Early osteogenic markers showed decreased or no change, while adipogenic gene expression decreased.

    Conclusions:

    • Fluid shear stress rapidly promotes gene availability through epigenetic changes, specifically DNA demethylation.
    • Mechanical stimulation effectively drives osteogenic lineage commitment by upregulating late-stage osteogenic markers.
    • DNA methylation analysis provides a robust method for evaluating lineage commitment influenced by mechanical cues.