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Membrane oligosaccharides: structure and function during differentiation.

P L Mann1

  • 1Department of Anatomy, School of Medicine, University of New Mexico, Albuquerque 87131.

International Review of Cytology
|January 1, 1988
PubMed
Summary
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Amoeba movement relies on a polarized cortical filament system of actin and myosin. Disrupting this system immobilizes the amoeba, altering cell shape and cytoplasmic organization.

Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Amoeboid movement is a fundamental cellular process.
  • Understanding the contractile mechanisms driving amoeboid motion is crucial.

Purpose of the Study:

  • To elucidate the structural and functional basis of ameboid movement in Amoeba proteus.
  • To investigate the role of the cortical filament system in cell locomotion.

Main Methods:

  • Normal light microscopy
  • Immunocytochemistry
  • Fluorescent-analog cytochemistry
  • Electron microscopy

Main Results:

  • Amoeba locomotion is driven by a polarized cortical filament layer composed of actin and myosin.
  • This layer exhibits distinct zones of reformation, contraction, and destruction.

Related Experiment Videos

  • Internal hydraulic pressure, regulated by calcium ions, ATP, and proteins, controls cytoplasmic streaming.
  • External stimuli disrupting the filament system's polarity cause immobilization and changes in cell shape and organization.

    • Conclusions:

    • The cortical filament system is essential for amoeboid movement.
    • Alterations in this system lead to loss of motility.
    • Future research should consider the role of a complex cytoskeleton including intermediate and microtubular structures.