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Chronohaematological changes in the lizard Calotes versicolor after pinealectomy

C Haldar, J P Thapliyal

    Annales D'Endocrinologie
    |January 1, 1981
    PubMed
    Summary

    Pineal removal in lizards disrupted blood cell production and glucose levels. However, sham-operated lizards showed normal circadian rhythms, indicating the pineal gland

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    Area of Science:

    • Chronobiology
    • Hematology
    • Endocrinology

    Background:

    • The pineal gland plays a role in regulating circadian rhythms and physiological processes.
    • Understanding the pineal gland's influence on hematology is crucial for comprehending its broader physiological impact.

    Purpose of the Study:

    • To investigate the effects of pinealectomy on chronohaematology in lizards.
    • To determine if pineal removal disrupts circadian rhythms in blood parameters and glucose levels.

    Main Methods:

    • A comparative study involving pinealectomized and sham-operated lizards.
    • Blood samples were collected over a 48-hour period for analysis.
    • Key hematological parameters (WBC, RBC) and glucose levels were measured.

    Main Results:

    • Pinealectomy significantly inhibited leucopoiesis and erythropoiesis.
    • Hypoglycemia was observed in pinealectomized lizards.
    • Sham-operated lizards exhibited clear circadian rhythms in WBC, RBC, and glucose levels.
    • The impact of pineal extirpation on chronohaematology varied significantly with the time scale (P < 0.01).

    Conclusions:

    • The pineal gland is essential for maintaining normal hematopoiesis and glucose homeostasis in lizards.
    • Pinealectomy disrupts the established circadian rhythms of blood parameters and glucose.
    • The pineal gland's influence on chronohaematology is time-dependent.

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