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Related Experiment Videos

Integrin-dependent leukocyte adhesion involves geranylgeranylated protein(s).

L Liu1, P Moesner, N L Kovach

  • 1Division of Hematology, University of Washington, Seattle, Washington 98195, USA. liliu@u.washington.edu

The Journal of Biological Chemistry
|November 24, 1999
PubMed
Summary
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Lovastatin inhibits leukocyte adhesion by blocking post-receptor events, specifically protein geranylgeranylation, which is crucial for integrin function. This finding highlights a novel therapeutic target for modulating inflammatory cell adhesion.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Integrin-dependent leukocyte adhesion is vital for immune responses.
  • Adhesion can be modulated by changes in integrin affinity or post-receptor signaling.
  • Lovastatin, a statin drug, affects cellular processes beyond cholesterol synthesis.

Purpose of the Study:

  • To investigate the effect of lovastatin on integrin-dependent leukocyte adhesion.
  • To determine whether lovastatin affects integrin affinity or post-receptor events.
  • To elucidate the specific molecular mechanisms underlying lovastatin's inhibitory action.

Main Methods:

  • Jurkat T-cells and U937 cells were treated with lovastatin.
  • Leukocyte adhesion assays were performed using fibronectin and laminin as substrates.

Related Experiment Videos

  • Stimulation was achieved using phorbol 12-myristate 13-acetate (PMA) or a beta(1) integrin-activating antibody (mAb 8A2).
  • Involvement of specific signaling pathways (MAPK, PI3K) and protein prenylation was assessed using inhibitors and specific prenyl compounds.

    • Main Results:

    • Lovastatin inhibited PMA-stimulated alpha(4)beta(1) and alpha(6)beta(1) integrin-dependent adhesion.
    • Lovastatin did not inhibit adhesion stimulated by the beta(1) integrin-activating antibody.
    • The inhibitory effect was reversed by geranylgeraniol, implicating protein geranylgeranylation.
    • Inhibition of protein geranylgeranylation, but not farnesylation, blocked PMA-stimulated adhesion.

    Conclusions:

    • Protein geranylgeranylation is essential for integrin-dependent post-receptor events in leukocyte adhesion.
    • Lovastatin's anti-adhesive effect is mediated by the inhibition of protein geranylgeranylation.
    • Targeting protein geranylgeranylation may offer a strategy to control leukocyte adhesion in inflammatory conditions.