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Related Experiment Videos

Plasma membrane involvement in brown fat thermogenesis.

B A Horwitz

    Experientia. Supplementum
    |January 1, 1978
    PubMed
    Summary

    Brown fat cells use alpha- and beta-adrenergic receptors to generate heat (thermogenesis). Beta-receptor activation yields greater heat production than alpha-receptor activation, involving increased cellular energy (ATP) use and mitochondrial activity.

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    Introduction: physiology, pathophysiology, and genetics of body weight/adiposity regulation.

    Experimental biology and medicine (Maywood, N.J.)·2001

    Area of Science:

    • Cell biology
    • Metabolism
    • Adrenergic signaling

    Background:

    • Brown adipocytes possess distinct alpha- and beta-adrenergic receptors.
    • Norepinephrine activates these receptors, initiating brown fat thermogenesis.
    • Both receptor pathways share some common events but differ in overall calorigenic effect.

    Purpose of the Study:

    • To investigate the distinct roles of alpha- and beta-adrenergic receptors in brown fat thermogenesis.
    • To compare the quantitative contribution of each pathway to heat production.
    • To elucidate the underlying mechanisms, including ATP turnover and mitochondrial function.

    Main Methods:

    • Experimental analysis of brown adipocyte plasma membranes.
    • Activation of alpha- and beta-adrenergic receptors.
    • Measurement of adrenergic-evoked respiration.
    • Assessment of sensitivity to Na+/K+ pump blockade and atractyloside.

    Main Results:

    • Both alpha- and beta-adrenergic receptor activation stimulate brown fat thermogenesis.
    • Beta-adrenergic receptor-induced calorigenesis is quantitatively greater than alpha-adrenergic pathway.
    • Adrenergic-evoked respiration is sensitive to Na+/K+ pump blockade and atractyloside.

    Conclusions:

    • Brown fat thermogenesis involves distinct alpha- and beta-adrenergic receptor pathways.
    • Beta-adrenergic pathways contribute more significantly to heat production.
    • Thermogenesis reflects increased ATP turnover and mitochondrial ATP synthesis, supported by sensitivity to pump blockade and atractyloside.

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