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From the * Institut für Zellbiologie, ZMBE, Universität Münster, Germany; We have shown recently that mouse Th1 cells but not Th2 cells are selectively recruited into
inflamed sites of a delayed-type hypersensitivity (DTH) reaction of the skin. This migration
was blocked by monoclonal antibodies (mAb) against P- and E-selectin. Here we show that Th1
cells bind to P-selectin via the P-selectin glycoprotein ligand-1 (PSGL-1). This is the only glycoprotein ligand that was detectable by affinity isolation with a P-selectin-Ig fusion protein.
Binding of Th1 cells to P-selectin, as analyzed by flow cytometry and in cell adhesion assays,
was completely blocked by antibodies against PSGL-1. The same antibodies blocked partially
the migration of Th1 cells into cutaneous DTH reactions. This blocking activity, in combination with that of a mAb against E-selectin, was additive. PSGL-1 on Th2 cells, although expressed at similar levels as on Th1 cells, did not support binding to P-selectin. Thus, the P-selectin-binding
form of PSGL-1 distinguishes Th1 cells from Th2 cells. Furthermore, PSGL-1 is relevant for the entry of Th1 cells into inflamed areas of the skin. This is the first demonstration for the importance of PSGL-1 for mouse leukocyte recruitment in vivo.
Abteilung für
Immunologie, Medizinische Klinik, Universitätskrankenhaus Eppendorf, Hamburg, Germany; § Institut für Exp. Medizin u. Bindegewebsforschung, Universität Erlangen-Nürnberg, Germany
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