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Related Experiment Videos

Brown fat activity in fasted and refed rats.

N J Rothwell, M E Saville, M J Stock

    Bioscience Reports
    |April 1, 1984
    PubMed
    Summary

    Fasting reduces brown adipose tissue (BAT) mass and mitochondrial function in rats. Refeeding with carbohydrates partially restores BAT

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    Area of Science:

    • Metabolic Physiology
    • Mitochondrial Biology
    • Adipose Tissue Research

    Background:

    • Brown adipose tissue (BAT) plays a role in thermogenesis and metabolic rate.
    • Fasting is known to alter metabolic processes and body composition.
    • Understanding BAT's response to nutritional changes is crucial for metabolic health.

    Purpose of the Study:

    • To investigate the impact of fasting and subsequent refeeding on brown adipose tissue (BAT) mass and function in rats.
    • To determine if changes in BAT contribute to metabolic rate alterations during fasting and refeeding.
    • To explore the role of mitochondrial pathways in BAT's response to nutritional status.

    Main Methods:

    • Rats were subjected to a 4-day fasting period.
    • BAT mass, mitochondrial protein, and guanosine diphosphate (GDP) binding were measured.
    • Mitochondrial enzyme activities (cytochrome oxidase, alpha-glycerophosphate dehydrogenase) were assessed.
    • Effects of carbohydrate refeeding after fasting were examined.

    Main Results:

    • Fasting significantly reduced BAT mass, mitochondrial protein, and GDP binding capacity.
    • GDP binding to BAT mitochondria decreased by 55% after 4 days of fasting.
    • Carbohydrate refeeding increased specific GDP binding by 27% 24 hours later.
    • Mitochondrial enzyme activities remained largely unaffected by fasting or refeeding.

    Conclusions:

    • BAT mass and mitochondrial GDP binding are sensitive to fasting and refeeding.
    • Changes in BAT mitochondrial function may contribute to the decrease in metabolic rate during fasting.
    • BAT's adaptive response to carbohydrate refeeding suggests a role in metabolic rate recovery.

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