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Hungry irony.

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    Iron deficiency can cause appetite loss, but the link to the satiety hormone leptin was unclear. This study reveals iron regulates leptin via CREB activation, connecting dietary iron to appetite control.

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    Area of Science:

    • Endocrinology
    • Nutritional Science
    • Molecular Biology

    Background:

    • Iron deficiency is associated with appetite loss, which is reversible with iron supplementation.
    • The proposed influence of iron on the satiety hormone leptin has lacked a direct mechanistic link.
    • Understanding the iron-leptin relationship is crucial for appetite regulation research.

    Purpose of the Study:

    • To elucidate the direct mechanistic connection between iron and the appetite-regulating hormone leptin.
    • To investigate the role of iron in modulating leptin expression in adipocytes.
    • To identify the molecular pathways mediating the effect of iron on leptin.

    Main Methods:

    • Analysis of the relationship between adipocyte iron levels and leptin expression.
    • Investigation of iron-dependent activation of cAMP-responsive element binding protein (CREB).
    • Assessment of CREB's role as a repressor of leptin transcription.

    Main Results:

    • An inverse relationship was identified between adipocyte iron levels and leptin production.
    • Iron supplementation was shown to activate CREB in an iron-dependent manner.
    • CREB was confirmed to function as a transcriptional repressor of leptin.

    Conclusions:

    • This study establishes a mechanistic link between dietary iron and leptin, a key appetite-regulating hormone.
    • Iron influences leptin levels through the activation of CREB, a transcription factor that represses leptin.
    • The findings provide a molecular basis for how iron status affects appetite and satiety.