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Anisotropic molecular motion on cell surfaces.

B A Smith, W R Clark, H M McConnell

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1979
    PubMed
    Summary
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    Researchers studied succinylconcanavalin A receptor movement on mouse fibroblasts using photobleaching. They discovered anisotropic diffusion, meaning receptors moved differently parallel and perpendicular to cell stress fibers.

    Area of Science:

    • Cell Biology
    • Biophysics

    Background:

    • Succinylconcanavalin A receptors play roles in cell adhesion and signaling.
    • Understanding receptor dynamics is crucial for cell surface studies.

    Purpose of the Study:

    • To characterize the motion of succinylconcanavalin A receptors on mouse fibroblast surfaces.
    • To investigate anisotropic diffusion patterns influenced by cellular structures.

    Main Methods:

    • Utilized photobleaching in a two-dimensional periodic pattern to track receptor movement.
    • Employed two-dimensional Fourier analysis to determine anisotropic motion.
    • Observed the impact of cell shape alterations on photobleach patterns.

    Main Results:

    • Succinylconcanavalin A receptors exhibited anisotropic two-dimensional diffusion.

    Related Experiment Videos

  • Diffusion coefficients measured were approximately 10(-11) cm2/sec parallel to stress fibers and 10(-12) cm2/sec perpendicular to them.
  • Cell shape changes influenced the observed photobleach patterns.

    • Conclusions:

    • Cellular stress fibers impose directionality on succinylconcanavalin A receptor diffusion.
    • The study provides insights into the mechanisms governing receptor mobility in adherent cells.
    • Anisotropic diffusion is a key characteristic of these receptors in their native cellular environment.