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Stress-Induced PTBP1 Reprograms Neuronal Function and Activates Cellular Senescence.

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    Summary
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    Oxidative stress increases PTBP1, a protein that harms neuronal function and promotes aging. Lowering PTBP1 levels protects cells from senescence, revealing a key switch in neuronal aging.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Genetics

    Background:

    • Chronic oxidative stress contributes significantly to neuronal aging.
    • Neurons accumulate DNA damage with age due to high oxygen consumption and limited DNA repair, leading to functional decline and neurodegenerative diseases.

    Purpose of the Study:

    • To identify regulators of neuronal aging and senescence.
    • To investigate the role of PTBP1 in response to oxidative stress and its impact on neuronal function and senescence.

    Main Methods:

    • Studied PTBP1 expression in response to oxidative stress in neuronal cell models (ShSY-5Y, primary mouse cortical neurons) and fibroblasts.
    • Utilized gene knockdown and overexpression techniques.
    • Performed transcriptomic analyses to assess gene expression changes.
    • Investigated the regulatory mechanism of PTBP1 induction via CTCF binding.

    Main Results:

    • Oxidative stress robustly increases PTBP1 expression in neurons, correlating with decreased expression of neuronal genes (e.g., PTBP2) and increased stress-responsive genes.
    • Knockdown of PTBP1 in fibroblasts reduced the expression of senescence genes.
    • PTBP1 overexpression led to repression of neuronal commitment genes and activation of stress and senescence genes.

    Conclusions:

    • PTBP1 acts as a stress-inducible negative regulator of neuronal gene expression and a promoter of senescence.
    • PTBP1 functions as a molecular switch influencing neuronal function and survival during aging.
    • Oxidative stress-induced PTBP1 suppresses neuronal PTBP2 expression and promotes a senescence program.