Neutrophils, monocytes, and dendritic cells express the same specialized form of PSGL-1 as do skin-homing memory T cells: cutaneous lymphocyte antigen

JD Kieffer, RC Fuhlbrigge, D Armerding… - Biochemical and …, 2001 - Elsevier
JD Kieffer, RC Fuhlbrigge, D Armerding, C Robert, K Ferenczi, RT Camphausen, TS Kupper
Biochemical and biophysical research communications, 2001Elsevier
Memory T cells in inflamed skin express the cutaneous lymphocyte-associated antigen
(CLA), a glycosylated epitope defined by the mAb HECA-452. We previously reported that
on T cells, CLA occurs almost exclusively on the protein backbone of P-selectin glycoprotein
ligand-1 (PSGL-1). T cells exhibiting the CLA isoform of PSGL-1 can tether and roll on both
E-and P-selectin, while T cells expressing PSGL-1 without the CLA epitope do not bind E-
selectin, though they may bind P-selectin. We show here that circulating neutrophils and …
Memory T cells in inflamed skin express the cutaneous lymphocyte-associated antigen (CLA), a glycosylated epitope defined by the mAb HECA-452. We previously reported that on T cells, CLA occurs almost exclusively on the protein backbone of P-selectin glycoprotein ligand-1 (PSGL-1). T cells exhibiting the CLA isoform of PSGL-1 can tether and roll on both E- and P-selectin, while T cells expressing PSGL-1 without the CLA epitope do not bind E-selectin, though they may bind P-selectin. We show here that circulating neutrophils and monocytes, and cultured blood dendritic cells, also express CLA almost entirely as an isoform of PSGL-1. These cells all tether and roll on both E- and P-selectin. A chimeric fusion protein incorporating the 19 N-terminal amino acids of mature PSGL-1 exhibited HECA-452 immunoreactivity and supported rolling of CHO cells expressing either E- or P-selectin. These findings indicate a site for the CLA modification within the distal tip of PSGL-1, previously shown to be critical for P-selectin binding and to mediate some, but not all, of the E-selectin binding of PSGL-1. We hypothesize that the types of circulating leukocytes discussed above all use CLA/PSGL-1 to tether and roll on E- and P-selectin along the vascular endothelium.
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