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Related Experiment Videos

Macrophage deformability and phagocytosis.

M T Mazur, J R Williamson

    The Journal of Cell Biology
    |October 1, 1977
    PubMed
    Summary

    Metabolic inhibitors affect macrophage function. Contractile proteins, not microtubules, are key to cell deformability and phagocytosis, independent of ATP levels.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Immunology

    Background:

    • Macrophage deformation and phagocytosis are crucial for immune responses.
    • Cellular ATP content is vital for energy-dependent cellular processes.
    • Understanding the role of cellular structures in these processes is essential.

    Purpose of the Study:

    • To investigate the influence of metabolic inhibitors and pharmacologic agents on macrophage deformation and phagocytosis.
    • To correlate these effects with changes in cellular ATP content.
    • To elucidate the roles of contractile proteins and microtubules in macrophage deformability.

    Main Methods:

    • Macrophages were treated with various metabolic inhibitors and pharmacologic agents.
    • Cell deformability was assessed under fluid shear stress.
    • Phagocytosis of latex beads was measured.
    • Cellular ATP content was quantified.

    Main Results:

    • Glycolysis inhibitors (iodoacetate, sodium fluoride) and sulfhydryl agents (N-ethylmaleimide) inhibited phagocytosis and reduced cell deformability.
    • Microtubule disruptors (vinblastine) inhibited phagocytosis but not deformability.
    • Microfilament disruptors (cytochalasin B) and organomercurial agents (PCMBS) inhibited phagocytosis and increased deformability.
    • Effects on phagocytosis and deformability showed no consistent relationship with ATP content.
    • Contractile proteins appear critical for phagocytosis and deformability, while microtubules do not significantly influence deformability.

    Conclusions:

    • Cell deformability induced by certain agents is not due to glycolysis inhibition but likely involves contractile proteins.
    • Contractile proteins play a significant role in both phagocytosis and determining cell deformability.
    • Microtubules are not major determinants of macrophage deformability.

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