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Related Experiment Videos

Tight junctions are membrane microdomains.

A Nusrat1, C A Parkos, P Verkade

  • 1Epithelial Pathobiology Research Unit, Department of Pathology, Emory University School of Medicine, Atlanta GA, USA. anusrat@emory.edu

Journal of Cell Science
|April 19, 2000
PubMed
Summary
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Tight junctions (TJs) in polarized epithelial cells are organized within raft-like membrane microdomains. These specialized compartments, rich in cholesterol, are crucial for TJ protein localization and regulating barrier function.

Area of Science:

  • Cell Biology
  • Epithelial Biology
  • Membrane Biology

Background:

  • Polarized epithelial cells possess tight junctions (TJs) that control barrier function.
  • TJs are dynamically regulated and involve lipid-modified signaling proteins.
  • The structural organization of TJs within specific membrane microdomains was investigated.

Purpose of the Study:

  • To investigate the possibility that tight junctions are composed of unique microdomains.
  • To characterize the membrane microdomains associated with TJ proteins.

Main Methods:

  • Differential detergent extraction and isopycnic sucrose density gradients were used to isolate TJ-enriched membranes from T84 intestinal epithelial cells.
  • Characterization of isolated fractions included Triton X-100 insolubility, light scattering, buoyant density, and cholesterol content analysis.

Related Experiment Videos

  • Immunoprecipitation, immunofluorescence, and immunogold labeling were employed to study protein colocalization.

    • Main Results:

    • Major pools of hyperphosphorylated occludin (HO) and ZO-1 were found in detergent-insoluble glycolipid (DIG)-like membrane microdomains.
    • These DIG-like fractions exhibited properties of lipid rafts, including Triton X-100 insolubility and increased cholesterol.
    • Caveolin-1 was found to coprecipitate with occludin, and colocalize with TJs, suggesting a role in TJ organization.

    Conclusions:

    • Tight junctions are organized within raft-like membrane microdomains.
    • These microdomains play a significant role in the spatial organization of TJ proteins.
    • Raft-like compartments are likely involved in regulating paracellular permeability in epithelial cells.