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Targeting negative phosphorylation to activate AMPK.

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    AMP-activated protein kinase (AMPK) regulates cellular energy. This study reveals a feedback mechanism inhibiting AMPK activity and introduces a peptide activator that suppresses gluconeogenesis and promotes mitochondrial fission.

    Keywords:
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    Area of Science:

    • Metabolic regulation
    • Cellular energy homeostasis
    • Molecular signaling pathways

    Background:

    • AMP-activated protein kinase (AMPK) is a key metabolic regulator, promoting catabolic processes and inhibiting anabolism to maintain cellular energy.
    • While PKA and AKT are known to inhibit AMPK via phosphorylation, the mechanisms maintaining low AMPK activity are not fully understood.
    • Understanding AMPK regulation is crucial for metabolic disease research.

    Purpose of the Study:

    • To investigate the feedback mechanisms regulating AMPK activity.
    • To identify novel strategies for AMPK activation.
    • To explore the effects of AMPK activation on gluconeogenesis and mitochondrial dynamics.

    Main Methods:

    • In vitro phosphorylation assays using AMPK activators like AICAR.
    • Design and screening of a novel peptide targeting AMPKα2.
    • Analysis of gluconeogenic gene expression and mitochondrial morphology in hepatocytes.

    Main Results:

    • AICAR activation of AMPK led to prolonged phosphorylation at inhibitory sites (S496/S491), indicating feedback inhibition.
    • Functional AMPK complexes were shown to phosphorylate AMPKα1/2 at these inhibitory sites in vitro.
    • A newly developed AMPKα2-targeting peptide successfully activated AMPK, suppressed gluconeogenic gene expression, and promoted mitochondrial fission.

    Conclusions:

    • AMPK activity is subject to feedback inhibition through phosphorylation at S496/S491.
    • A novel peptide inhibitor of negative phosphorylation can activate AMPK.
    • Targeted AMPK activation holds potential for suppressing gluconeogenesis and modulating mitochondrial dynamics in liver cells.