Human P-selectin glycoprotein ligand-1 (PSGL-1) interacts with the skin-associated chemokine CCL27 via sulfated tyrosines at the PSGL-1 amino terminus.
P-selectin glycoprotein ligand-1 (PSGL-1), a sialomucin expressed on leukocytes, is a major ligand for P-selectin and mediates leukocyte rolling on the endothelium. Here we show that human PSGL-1 interacts with CCL27 (CTACK/ILC/ESkine), a skin-associated chemokine that attracts skin-homing T lymphocytes. A recombinant soluble form of PSGL-1 (rPSGL-Ig) preferentially bound CCL27 among several chemokines tested. This interaction was abrogated by arylsulfatase treatment of rPSGL-Ig, suggesting that sulfated tyrosines play a critical role. In contrast, removal of either N-glycans or O-glycans by glycosidase treatment of rPSGL-Ig did not affect the interaction. The binding of CCL27 to a recombinant PSGL-1 synthesized in the presence of a sulfation inhibitor was lower than that produced in normal medium. Moreover, mutation of the tyrosines at the amino terminus of PSGL-1 to phenylalanine abolished the binding, further supporting the role of sulfated tyrosines in the CCL27-PSGL-1 interaction. Functionally, rPSGL-Ig reduced the chemotaxis of L1.2 cells expressing CCR10, the receptor for CCL27. In addition, the expression of human PSGL-1 on CCR10-expressing L1.2 cells resulted in reduced chemotaxis to CCL27. These findings suggest a role for PSGL-1 in regulating chemokine-mediated responses, in addition to its role as a selectin ligand.
Hirata
Takako
T
Laboratory of Molecular and Cellular Recognition, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan. thirata@orgctl.med.osaka-u.ac.jp
Furukawa
Yuko
Y
Yang
Bo-Gie
BG
Hieshima
Kunio
K
Fukuda
Minoru
M
Kannagi
Reiji
R
Yoshie
Osamu
O
Miyasaka
Masayuki
M
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D019556:COS Cells; D002460:Cell Line; D054425:Chemokine CCL27; D019742:Chemokines, CC / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004247:DNA / Q000235:genetics; D006801:Humans; D066298:In Vitro Techniques; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D011485:Protein Binding; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012867:Skin / Q000378:metabolism; D014443:Tyrosine / Q000737:chemistry
C492276:CCL27 protein, human; D054425:Chemokine CCL27; D019742:Chemokines, CC; D008562:Membrane Glycoproteins; C084882:P-selectin ligand protein; D011994:Recombinant Proteins; D014443:Tyrosine; D004247:DNA