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Integrin-mediated adhesion regulates membrane order.

Katharina Gaus1, Soazig Le Lay, Nagaraj Balasubramanian

  • 1Centre for Vascular Research, School of Medical Sciences, University of New South Wales, Sydney, 2052 NSW, Australia. k.gaus@unsw.edu.au

The Journal of Cell Biology
|September 1, 2006
PubMed
Summary
This summary is machine-generated.

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Cell adhesion and caveolin regulate membrane order within lipid rafts. Focal adhesions exhibit higher membrane order, influenced by caveolin phosphorylation, impacting cell signaling.

Area of Science:

  • Cell Biology
  • Membrane Biophysics

Background:

  • Cholesterol-dependent domains, or lipid rafts, are crucial for cell membrane function but their properties remain debated.
  • Integrin-mediated cell adhesion and caveolin are known regulators of raft component trafficking.

Purpose of the Study:

  • To investigate the impact of cell adhesion and caveolin on the order of cell membranes.
  • To determine the relationship between focal adhesions, caveolae, and membrane order.

Main Methods:

  • Utilized the fluorescent probe Laurdan and two-photon microscopy to assess membrane order.
  • Examined membrane order in focal adhesions, caveolae, and cholera toxin subunit B (CtxB)-stained domains.
  • Investigated the role of caveolin phosphorylation at Tyr14 and cell detachment on membrane order.

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Main Results:

  • Focal adhesions display significantly higher membrane order compared to caveolae or CtxB-stained domains.
  • Membrane order in focal adhesions is partly dependent on caveolin1 phosphorylation at Tyr14.
  • Cell detachment induces a rapid, caveolin-independent decrease in membrane order, followed by a slower, caveolin-dependent decrease associated with CtxB domain internalization.
  • Internalized CtxB domains exhibit increased fluidity.

Conclusions:

  • Membrane order is intricately linked to the presence and function of caveolae and focal adhesions.
  • Lipid raft properties are determined by the assembly of specific protein complexes.
  • The ordered membrane state within focal adhesions likely plays a significant role in cell signaling processes at these sites.