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Related Experiment Videos

Trans-dominant inhibition of integrin function

F Díaz-González1, J Forsyth, B Steiner

  • 1Department of Vascular Biology, Scripps Research Institute, La Jolla, California 92037, USA.

Molecular Biology of the Cell
|December 1, 1996
PubMed
Summary
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Integrin receptors can inhibit other integrins through trans-dominant inhibition, affecting cell adhesion and signaling. This process involves conformational changes and cytoplasmic tails, impacting biological functions.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin adhesion receptors play crucial roles in cell adhesion and signaling.
  • Ligand binding induces conformational changes in integrins, affecting their function.
  • Integrin interactions can influence the behavior of other integrins within the cell.

Purpose of the Study:

  • To investigate the relationship between ligand-induced conformational changes and integrin signaling.
  • To examine how ligands for integrin alpha IIb beta 3 affect the functions of integrins alpha 5 beta 1 and alpha 2 beta 1.
  • To elucidate the mechanisms underlying trans-dominant inhibition in integrin function.

Main Methods:

  • Studied the effects of specific ligands on integrin alpha IIb beta 3.

Related Experiment Videos

  • Assessed the functional impact on target integrins alpha 5 beta 1 and alpha 2 beta 1.
  • Analyzed conformational changes in integrin extracellular domains and the role of the beta cytoplasmic tail.

    • Main Results:

    • Ligand binding to one integrin (alpha IIb beta 3) inhibited the function of other integrins (alpha 5 beta 1, alpha 2 beta 1) via trans-dominant inhibition.
    • Trans-dominant inhibition resulted from a blockade of integrin signaling.
    • Inhibition involved extracellular domain conformational changes and the suppressive integrin's beta cytoplasmic tail.
    • Ligand-induced recruitment of alpha IIb beta 3 to focal adhesions also involved extracellular conformational rearrangement.

    Conclusions:

    • Ligand-induced conformational changes can propagate signals from the integrin's extracellular to intracellular domains.
    • Trans-dominant inhibition by integrin ligands can coordinate integrin signaling pathways.
    • These findings suggest potential for unexpected biological effects of integrin-specific inhibitors.