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Related Experiment Videos

[Circadian rhythm and aging].

V Richter, F Rassoul, W Rotzsch

    Zeitschrift Fur Die Gesamte Innere Medizin Und Ihre Grenzgebiete
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Aging affects liver lipogenic enzyme activity and circadian rhythms in female rats. While rhythms remain synchronized, enzyme levels decrease with age, impacting metabolic regulation.

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    Area of Science:

    • Biochemistry
    • Chronobiology
    • Metabolism

    Context:

    • Investigates age-related changes in the circadian regulation of lipogenic enzymes in rat liver.
    • Examines the influence of aging on the daily fluctuations of key metabolic enzymes and serum markers.

    Purpose:

    • To determine how aging impacts the circadian rhythms and activity levels of specific lipogenic enzymes in female Wistar rats.
    • To assess age-dependent alterations in serum triglyceride and insulin levels under a controlled light-dark cycle.

    Summary:

    • Circadian rhythms of malic enzyme, isocitrate dehydrogenase, and alpha-glycerophosphate dehydrogenase were observed in young and old female rats.
    • Malic enzyme and alpha-glycerophosphate dehydrogenase activities were lower in aged rats, while glucose-6-phosphate dehydrogenase lost its rhythm.

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  • Serum triglyceride and insulin level variations showed no age-dependent changes in their circadian patterns.

    • Impact:

    • Highlights age-associated decline in specific lipogenic enzyme activity, potentially affecting lipid metabolism in aging rodents.
    • Reveals a loss of circadian rhythmicity in glucose-6-phosphate dehydrogenase in older rats, suggesting disrupted metabolic control.
    • Provides insights into the complex interplay between aging, circadian biology, and liver metabolism.