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Related Experiment Videos

Temperature effects on shape and function of human granulocytes

F J Lionetti, P S Lin, R J Mattaliano

    Experimental Hematology
    |March 1, 1980
    PubMed
    Summary

    Granulocyte shape and function are temperature-dependent. At body or fever temperatures, these immune cells exhibit dynamic surfaces and high phagocytic activity, unlike their inactive state at 4 degrees C.

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    Area of Science:

    • Cell Biology
    • Immunology

    Background:

    • Granulocytes are critical immune cells involved in phagocytosis.
    • Cellular morphology and function can be influenced by environmental factors such as temperature.

    Purpose of the Study:

    • To investigate the temperature-dependent shape transformations and functional changes of granulocytes.
    • To correlate granulocyte surface characteristics with their phagocytic capacity at different temperatures.

    Main Methods:

    • Granulocytes were isolated using counterflow centrifugation from CPD-anticoagulated whole blood.
    • Microscopic imaging and functional assays (phagocytosis of yeast and latex particles) were employed.
    • Cellular stability was assessed via volume distribution changes.

    Main Results:

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    • At 4 degrees C, granulocytes appeared as irregular spheres with microvilli and nodules, showing limited function.
    • At 22-45 degrees C, granulocytes displayed ameboid shapes with textured veils, exhibiting progressive membrane smoothing and functional decline over time.
    • Phagocytosis and cellular stability were directly correlated with temperature and shape progression.

    Conclusions:

    • Granulocyte membrane surfaces are dynamic and highly functional at body and fever temperatures (37-40 degrees C).
    • At 4 degrees C, granulocytes are less active spheres with reduced pseudopodia and veiling, though capable of slow function.