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Related Experiment Videos

Apical sorting by galectin-3-dependent glycoprotein clustering.

Delphine Delacour1, Christoph Greb, Annett Koch

  • 1Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, 35033 Marburg, Germany.

Traffic (Copenhagen, Denmark)
|February 27, 2007
PubMed
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Galectin-3 acts as an apical sorting receptor in epithelial cells by cross-linking glycoproteins. This interaction is essential for directing non-raft cargo to the apical membrane, maintaining cell polarity.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Epithelial cells maintain distinct apical and basolateral membrane domains, crucial for tissue function.
  • Specialized sorting machinery directs lipids and proteins to their correct membrane domains.
  • Galectin-3, a beta-galactoside-binding lectin, is found in lipid-raft-independent apical vesicles.

Purpose of the Study:

  • To investigate the role of galectin-3 in the apical sorting of glycoproteins.
  • To determine if galectin-3 mediates raft-independent sorting of apical cargo.
  • To elucidate the mechanism by which galectin-3 facilitates apical protein localization.

Main Methods:

  • Depletion of galectin-3 in epithelial cells.
  • Analysis of glycoprotein mistargeting to the basolateral membrane.

Related Experiment Videos

  • Investigation of high-molecular-weight cluster formation in the presence of galectin-3.
  • Assessment of cluster stability and apical sorting in glycosylation-deficient cells.

    • Main Results:

    • Galectin-3 is essential for the formation of high-molecular-weight glycoprotein clusters.
    • Cluster formation is dependent on galectin-3 and sensitive to carbohydrate concentrations.
    • Apical sorting of non-raft cargo is impaired in galectin-3-depleted and glycosylation-deficient cells.
    • Galectin-3 functions as an apical receptor mediating raft-independent sorting.

    Conclusions:

    • Glycoprotein cross-linking by galectin-3 is a key mechanism for apical sorting.
    • Galectin-3 plays a critical role in maintaining epithelial cell polarity.
    • This study identifies galectin-3 as a crucial mediator of apical protein localization independent of lipid rafts.