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Related Experiment Videos

Visualization of plasma membrane compartmentalization with patterned lipid bilayers.

Min Wu1, David Holowka, Harold G Craighead

  • 1Department of Chemistry and Chemical Biology and School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 10, 2004
PubMed
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Patterned lipid bilayers control receptor clustering and reveal dynamic uncoupling of inner and outer cell membrane leaflets. This study visualizes structural reorganization of cellular components during mast cell activation.

Area of Science:

  • Cell biology
  • Biophysics
  • Immunology

Background:

  • Cell surface receptors, like FcεRI, initiate signaling cascades upon ligand binding.
  • Lipid rafts are dynamic membrane microdomains involved in cellular processes.
  • Understanding membrane organization is crucial for cell signaling.

Purpose of the Study:

  • To investigate the structural reorganization of cellular components during mast cell activation.
  • To visualize the dynamics of receptor clustering and associated protein redistribution.
  • To explore the relationship between inner and outer leaflet components during cell activation.

Main Methods:

  • Utilized micrometer-size patterned lipid bilayers with liganded lipids to control receptor clustering.
  • Visualized structural reorganization of cellular components using advanced microscopy.

Related Experiment Videos

  • Monitored the redistribution of inner leaflet proteins, including Lyn kinase, and outer leaflet components.

    • Main Results:

    • Liganded lipids on patterned surfaces controlled receptor cluster size and location.
    • Inner leaflet proteins, including Lyn kinase, selectively redistributed with FcεRI clusters, dependent on actin polymerization.
    • Outer leaflet components associated with lipid rafts did not core-distribute with inner leaflet components.

    Conclusions:

    • Patterned surfaces enable visualization of dynamic cell membrane structural organization.
    • Revealed a large-scale, dynamic uncoupling between inner and outer leaflet components of lipid rafts during mast cell activation.
    • Provides novel insights into the spatial regulation of cell signaling at the plasma membrane.