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Single Myofiber Culture Assay for the Assessment of Adult Muscle Stem Cell Functionality Ex Vivo
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FOXP1 controls mesenchymal stem cell commitment and senescence during skeletal aging.

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    Forkhead box P1 (FOXP1) protein levels decrease with age, promoting mesenchymal stem cell (MSC) senescence. Restoring FOXP1 function may combat age-related bone loss and MSC dysfunction.

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    Area of Science:

    • Stem cell biology
    • Aging research
    • Molecular genetics

    Background:

    • Mesenchymal stem/progenitor cells (MSCs) undergo age-related changes, shifting differentiation from bone to fat and reducing self-renewal.
    • The molecular mechanisms orchestrating MSC aging remain incompletely understood.

    Purpose of the Study:

    • To investigate the role of forkhead box P1 (FOXP1) in the transcriptional control of MSC senescence.
    • To elucidate how FOXP1 influences MSC cell-fate decisions and replicative capacity during aging.

    Main Methods:

    • Utilized molecular and genetic approaches in mouse models.
    • Analyzed FOXP1 expression levels in bone marrow MSCs correlated with age and senescence markers.
    • Performed conditional gene depletion studies and promoter occupancy analyses.

    Main Results:

    • FOXP1 expression inversely correlated with the senescence marker p16INK4A in aging MSCs.
    • Conditional depletion of FOXP1 induced premature MSC aging, characterized by increased adiposity, decreased bone mass, and impaired self-renewal.
    • FOXP1 directly represses p16INK4A transcription and modulates MSC cell-fate through interactions with CEBPβ/δ and RBPjκ complexes.
    • Loss of p16INK4A partially rescued replication capacity and bone mass defects in FOXP1-deficient MSCs.

    Conclusions:

    • FOXP1 plays a critical role in attenuating MSC senescence.
    • FOXP1 maintains MSC replicative capacity and orchestrates cell-fate switching during aging in a dose- and age-dependent manner.