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Related Experiment Videos

Lymphocyte capping induced by polycationized ferritin.

B T Butman, G J Bourguignon, L Y Bourguignon

    Journal of Cellular Physiology
    |October 1, 1980
    PubMed
    Summary
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    Polycationized ferritin (PCF) induces lymphocyte surface receptor patching and capping. This process requires energy, an intact cytoskeleton, and is stimulated by increased cyclic AMP levels, suggesting a role for contractile elements.

    Area of Science:

    • Cell Biology
    • Immunology
    • Biochemistry

    Background:

    • Lymphocyte surface receptors undergo redistribution upon ligand binding.
    • Understanding the mechanisms of receptor patching and capping is crucial for immunology.

    Purpose of the Study:

    • To investigate the mechanism of lymphocyte surface receptor redistribution using polycationized ferritin (PCF).
    • To determine the cellular requirements for PCF-induced patching and capping.

    Main Methods:

    • Fluorescence and electron microscopy were used to observe PCF binding and receptor redistribution.
    • Experimental treatments included temperature changes, metabolic inhibitors, and cytoskeletal disruptors.
    • Double immunofluorescence with rhodamine-labeled PCF and fluorescein-conjugated heavy meromyosin identified actin accumulation.

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    Main Results:

    • PCF binding induced patching at 0°C and capping at 37°C in mouse lymphocytes.
    • PCF-induced capping was temperature-sensitive, required metabolic energy, and an intact cytoskeleton.
    • Cap formation correlated with intracellular actin accumulation beneath the cap.
    • Increased intracellular cyclic AMP levels stimulated PCF-associated capping.

    Conclusions:

    • PCF is a useful ligand for studying lymphocyte receptor redistribution.
    • Lymphocyte capping is an active process involving the cytoskeleton and metabolic energy.
    • Intracellular cyclic AMP may regulate membrane-associated contractile elements involved in receptor aggregation.