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Cross-talk of integrin alpha 3 beta 1 and tissue factor in cell migration

Academic Article
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Overview

authors

  • Dorfleutner, A.
  • Hintermann, E.
  • Tarui, T.
  • Takada, Y.
  • Ruf, Wolfram

publication date

  • October 2004

journal

  • Molecular Biology of the Cell  Journal

abstract

  • In cancer and angiogenesis, coagulation-independent roles of tissue factor (TF) in cell migration are incompletely understood. Immobilized anti-TF extracellular domain antibodies induce cell spreading, but this phenomenon is epitope specific and is not induced by anti-TF 5G9. Spreading on anti-TF is beta1 integrin-dependent, indicating functional interactions of the TF extracellular domain 5G9 epitope (a presumed integrin-binding site) and integrins. Recombinant TF extracellular domain supports adhesion of cells expressing alphavbeta3 or certain beta1 integrin heterodimers (alpha3beta1, alpha4beta1, alpha5beta1, alpha6beta1, alpha9beta1) and adhesion is blocked by specific anti-integrin antibodies or mutations in the integrin ligand-binding site. Although several studies have linked TF to cell migration, we here demonstrate that TF specifically regulates alpha3beta1-dependent migration on laminin 5. Expression of TF suppresses alpha3beta1-dependent migration, but only when the TF cytoplasmic domain is not phosphorylated. Suppression of migration can be reversed by 5G9, presumably by disrupting integrin interaction, or by the protease ligand VIIa, known to induce PAR-2-dependent phosphorylation of TF. In both cases, release of alpha3beta1 inhibition is prevented by mutation of critical phosphorylation sites in the TF cytoplasmic domain. Thus, TF influences integrin-mediated migration through cooperative intra- and extracellular interactions and phosphorylation regulates TF's function in cell motility.

subject areas

  • Animals
  • Antibodies, Monoclonal
  • Cell Adhesion
  • Cell Line
  • Cell Movement
  • Humans
  • Immunoglobulin Fab Fragments
  • Integrin alpha3beta1
  • Integrin alpha5
  • Phosphorylation
  • Protein Isoforms
  • Protein Structure, Tertiary
  • Signal Transduction
  • Thromboplastin
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Identity

PubMed Central ID

  • PMC519137

International Standard Serial Number (ISSN)

  • 1059-1524

Digital Object Identifier (DOI)

  • 10.1091/mbc.E03-09-0640

PubMed ID

  • 15254262
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Additional Document Info

start page

  • 4416

end page

  • 4425

volume

  • 15

issue

  • 10

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