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Circadian rhythm in murine reticuloendothelial function.

I Szabó, T G Kovats, F Halberg

    Chronobiologia
    |April 1, 1978
    PubMed
    Summary
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    This study reveals a daily rhythm in the immune system of mice. The phagocytic index, a measure of immune cell activity, shows a circadian rhythm, peaking during the light cycle.

    Area of Science:

    • Immunology
    • Chronobiology
    • Physiology

    Background:

    • Circadian rhythms influence various physiological processes.
    • The immune system exhibits daily variations in activity.
    • The reticuloendothelial system's circadian properties are not fully understood.

    Purpose of the Study:

    • To investigate the presence and characteristics of a circadian rhythm in the phagocytic activity of the reticuloendothelial system.
    • To determine the timing and amplitude of this rhythm in mice.

    Main Methods:

    • Six groups of 15 female CBA mice were used.
    • Phagocytic index was measured at 4-hour intervals over 24 hours after carbon particle injection.
    • Data were analyzed using ANOVA and the single cosinor method.

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    Main Results:

    • A statistically significant circadian rhythm in phagocytic index was demonstrated.
    • The rhythm exhibited a double amplitude of 20%.
    • The acrophase (peak activity) occurred during the latter half of the daily light span.

    Conclusions:

    • The reticuloendothelial system displays a circadian rhythm, contributing to the body's bioperiodic defense mechanisms.
    • Immune function, specifically phagocytosis, is most active during the light phase in these nocturnally active mice.
    • This finding expands the understanding of immunologic rhythms within the reticuloendothelial system.