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Nat Immunol. 2003 Nov;4(11):1083-92. Epub 2003 Oct 5.

Leukocyte functional antigen 1 lowers T cell activation thresholds and signaling through cytohesin-1 and Jun-activating binding protein 1.

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Department of Microbiology and Immunology, and The Baxter Laboratory of Genetic Pharmacology, Stanford University School of Medicine, Stanford, California 94305, USA.

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  • Nat Immunol. 2003 Dec;4(12):1254.


Leukocyte functional antigen 1 (LFA-1), with intercellular adhesion molecule ligands, mediates T cell adhesion, but the signaling pathways and functional effects imparted by LFA-1 are unclear. Here, intracellular phosphoprotein staining with 13-dimensional flow cytometry showed that LFA-1 activation induced phosphorylation of the beta(2) integrin chain and release of Jun-activating binding protein 1 (JAB-1), and mediated signaling of kinase Erk1/2 through cytohesin-1. Dominant negatives of both JAB-1 and cytohesin-1 inhibited interleukin 2 production and impaired T helper type 1 differentiation. LFA-1 stimulation lowered the threshold of T cell activation. Thus, LFA-1 signaling contributes to T cell activation and effects T cell differentiation.

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[Indexed for MEDLINE]

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