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PPARγ ablation sensitizes proopiomelanocortin neurons to leptin during high-fat feeding.

Lihong Long, Chitoku Toda, Jing Kwon Jeong

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    Summary

    Removing PPARγ from POMC neurons reduces body weight and food intake, improving metabolism. This highlights PPARγ

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    Area of Science:

    • Neuroscience
    • Metabolism
    • Endocrinology

    Background:

    • Central activation of peroxisome proliferator-activated receptor gamma (PPARγ) influences food intake and body weight.
    • The specific neurons mediating PPARγ’s role in energy homeostasis remain unidentified.

    Purpose of the Study:

    • To identify the role of PPARγ within proopiomelanocortin (POMC) neurons in regulating energy balance.
    • To investigate the cellular and physiological effects of PPARγ ablation in POMC neurons under high-fat diet (HFD) conditions.

    Main Methods:

    • Selective ablation of PPARγ in murine POMC neurons.
    • Analysis of peroxisome density, reactive oxygen species, and mitochondrial-endoplasmic reticulum interactions.
    • Assessment of energy expenditure, locomotor activity, body weight, fat mass, food intake, and glucose metabolism in mice on HFD.
    • Pharmacological manipulation of PPARγ activity in POMC-specific ablation models.

    Main Results:

    • PPARγ ablation in POMC neurons decreased peroxisome density, increased reactive oxygen species, and enhanced leptin sensitivity.
    • Mitochondrial-endoplasmic reticulum interactions were preserved in POMC-ablated mice despite HFD.
    • Mice lacking PPARγ in POMC neurons exhibited reduced body weight, fat mass, and food intake, alongside increased energy expenditure, locomotor activity, and improved glucose metabolism when fed an HFD.
    • Peripheral PPARγ modulation did not impact food intake in mice with POMC-specific PPARγ ablation.

    Conclusions:

    • PPARγ within POMC neurons is crucial for mediating cellular and functional adaptations to HFD.
    • POMC neuron PPARγ plays a significant role in regulating whole-body energy balance, impacting metabolism and body weight.
    • Targeting PPARγ in POMC neurons represents a potential strategy for managing diet-induced metabolic dysfunction.