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Research ArticleArticle

Allosteric LFA-1 Inhibitors Modulate Natural Killer Cell Function

Gabriele Weitz-Schmidt, Stéphanie Chreng and Simone Riek
Molecular Pharmacology February 2009, 75 (2) 355-362; DOI: https://doi.org/10.1124/mol.108.051169
Gabriele Weitz-Schmidt
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Stéphanie Chreng
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Simone Riek
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Abstract

Natural killer (NK) cells are believed to play an important role in a variety of disease pathologies, including transplant rejection and autoimmunity. None of the therapeutic modalities currently available are known to potently interfere with NK cell activity. Here we demonstrate for the first time that low molecular weight inhibitors of the integrin lymphocyte function-associated antigen-1 (LFA-1) readily block NK cell adhesion, activation, and NK cell-mediated cytolysis in vitro, in contrast to other immunosuppressive agents. These effects were independent of the type of allosteric mechanism by which LFA-1 inhibition was achieved. In addition, we describe a simple, nonradioactive whole-blood assay that should be suitable to monitor NK cell activation in clinical practice. Taken together, our study underlines the importance of LFA-1 in NK cell effector functions and indicates that allosteric LFA-1 inhibitors may become important tools to further elucidate the therapeutic potential of NK cell modulation in immunological diseases.

Footnotes

  • ABBREVIATIONS: NK, natural killer; BSA, bovine serum albumin; CFSE, 5(6)-carboxyfluorescein diacetate N-succinimidyl ester; CsA, cyclosporine A; DMSO, dimethyl sulfoxide; ICAM-1, intercellular adhesion molecule-1; IL, interleukin; LFA-1, lymphocyte function-associated antigen-1; mAb, monoclonal antibody; mTOR, molecular target-of-rapamycin; MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide; PBS, phosphate-buffered saline; PI, propidium iodide; TBS, Tris-buffered saline.

    • Received August 7, 2008.
    • Accepted October 27, 2008.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 75 (2)
Molecular Pharmacology
Vol. 75, Issue 2
1 Feb 2009
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Research ArticleArticle

Allosteric LFA-1 Inhibitors Modulate Natural Killer Cell Function

Gabriele Weitz-Schmidt, Stéphanie Chreng and Simone Riek
Molecular Pharmacology February 1, 2009, 75 (2) 355-362; DOI: https://doi.org/10.1124/mol.108.051169

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Research ArticleArticle

Allosteric LFA-1 Inhibitors Modulate Natural Killer Cell Function

Gabriele Weitz-Schmidt, Stéphanie Chreng and Simone Riek
Molecular Pharmacology February 1, 2009, 75 (2) 355-362; DOI: https://doi.org/10.1124/mol.108.051169
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