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The activation state of the integrin alpha(IIb)beta(3) affects outside-in signals leading to cell spreading and focal adhesion kinase phosphorylation

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Overview

authors

  • Pelletier, A. J.
  • Kunicki, T.
  • Ruggeri, Zaverio
  • Quaranta, V.

publication date

  • 1995

journal

  • Journal of Biological Chemistry  Journal

abstract

  • Integrins bind extracellular matrix and transduce signals mediating cell adhesion, spreading, and migration. It is unclear how these distinct responses follow from a common event: integrin clustering. We examined the relationship between integrin-mediated signals and the integrin's activation state using a cell line expressing alpha IIb beta 3 (Clone B) and a panel of monoclonal antibodies against this integrin. Non-activating antibodies used to cluster alpha IIb beta 3 stimulated focal adhesion kinase (FAK) phosphorylation, regardless of affinity, subunit specificity, or ligand-blocking phenotype. Coated on plastic, these antibodies supported cell adhesion, spreading, and FAK phosphorylation. In contrast, clustering of alpha IIb beta 3 induced with activating antibodies, or binding of soluble fibrinogen to antibody-activated alpha IIb beta 3, did not induce FAK phosphorylation. Thus, clustering of alpha IIb beta 3 on Clone B does not necessarily result in FAK phosphorylation. Coated on plastic, activating antibodies supported cell adhesion, but not spreading or FAK phosphorylation. Therefore, it appears the resting, not the active form of alpha IIb beta 3, induces cell spreading and FAK phosphorylation in Clone B. These data indicate that "inside-out" signals may alter not only the binding specificity of an integrin, but the "outside-in" biochemical signals that integrin initiates as well. This activation state-linked signaling represents a novel mechanism, which may explain how diverse cellular responses are induced by integrin-matrix interactions.

subject areas

  • Antibodies, Monoclonal
  • Cell Adhesion
  • Cell Adhesion Molecules
  • Cell Line, Transformed
  • Cell Movement
  • Fibrinogen
  • Focal Adhesion Kinase 1
  • Focal Adhesion Protein-Tyrosine Kinases
  • Humans
  • Integrins
  • Phosphorylation
  • Phosphotyrosine
  • Platelet Glycoprotein GPIIb-IIIa Complex
  • Protein-Tyrosine Kinases
  • Signal Transduction
  • Tyrosine
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Identity

International Standard Serial Number (ISSN)

  • 0021-9258

PubMed ID

  • 7543096
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Additional Document Info

start page

  • 18133

end page

  • 18140

volume

  • 270

issue

  • 30

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