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Human memory T cells associated with cutaneous inflammatory responses are characterized by their expression of cutaneous lymphocyte-associated Ag (CLA), a carbohydrate determinant differentially expressed on P-selectin glycoprotein ligand-1 (PSGL-1). Although expression of the CLA epitope on PSGL-1 (CLA(+) PSGL-1) by memory T cells is associated with acquisition of E-selectin ligand activity, it is not known whether CLA(+) PSGL-1, itself, is a ligand for E-selectin on human T cells or whether other glycoproteins, with or without CLA modification, support E-selectin-dependent rolling in shear flow. To address this issue, we developed a method for real-time analysis of functional adhesive interactions between selectin-bearing cells in shear flow with leukocyte ligands resolved by SDS-PAGE and immobilized on standard Western blots. The results of these studies provide direct evidence that CLA(+) PSGL-1 is a functional ligand for both E- and P-selectin, confirm that the P-selectin ligand activity of PSGL-1 is independent of CLA modification, and identify a distinct, non-PSGL-1 E-selectin ligand on CLA-positive human memory T cells.

Direct Real-Time Observation of E- and P-Selectin-Mediated Rolling on Cutaneous Lymphocyte-Associated Antigen Immobilized on Western Blots