The immortalized human corneal epithelial cells adhere to laminin-10 by using Lutheran glycoproteins and integrin

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Sissi Hasenson1, Marko Määttä, Patricia Rousselle

  • 1Institute of Biomedicine/Anatomy, University of Helsinki, Helsinki, Finland. mailto:sissi.hasenson@helsinki.fi

Experimental Eye Research
|September 28, 2005
PubMed

Insights

Human corneal epithelial cells adhere to laminin-10 via the Lutheran receptor and integrin alpha3beta1. These interactions promote cell adhesion and spreading without forming focal adhesions, crucial for corneal health.

Area of Science:

  • Cell Biology
  • Ophthalmology
  • Biochemistry

Background:

  • The corneal epithelium forms a protective barrier, relying on specific cell-matrix interactions for integrity.
  • Laminin-10 (Ln-10), a component of the basement membrane, plays a critical role in epithelial cell adhesion.
  • Understanding the molecular mechanisms of corneal epithelial cell adhesion to Ln-10 is vital for ocular surface research.

Purpose of the Study:

  • To investigate the molecular receptors mediating human corneal epithelial (HCE) cell adhesion to laminin-10 (Ln-10).
  • To characterize the role of the Lutheran (Lu) receptor and integrin alpha3beta1 in HCE cell adhesion and spreading on Ln-10.

Main Methods:

  • Immunofluorescence staining using monoclonal antibodies to identify cell surface receptors.
  • Northern blot analysis to detect Lutheran receptor transcripts in HCE cells.
  • Quantitative adhesion assays to measure HCE cell binding to Ln-10.

Main Results:

  • The Lutheran (Lu) receptor was identified on basal corneal cells and HCE cells adhering to Ln-10.
  • Alpha- and beta-dystroglycans were not detected on HCE cells.
  • Ln-10 induced HCE cell adhesion and spreading independently of focal adhesion formation.
  • Both Lu and integrin alpha3beta1 were found to independently mediate HCE cell adhesion to Ln-10.

Conclusions:

  • The Lutheran receptor and integrin alpha3beta1 are key mediators of human corneal epithelial cell adhesion to laminin-10.
  • These interactions facilitate cell adhesion and spreading, contributing to corneal epithelial integrity.
  • The absence of dystroglycans suggests an alternative pathway for Ln-10 interaction in corneal cells.

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