| Autor: |
Zou X; Department of Chemical Engineering, 172 Stocker Center, Ohio University, Athens, OH 45701, USA., Shinde Patil VR, Dagia NM, Smith LA, Wargo MJ, Interliggi KA, Lloyd CM, Tees DF, Walcheck B, Lawrence MB, Goetz DJ |
| Jazyk: |
angličtina |
| Zdroj: |
American journal of physiology. Cell physiology [Am J Physiol Cell Physiol] 2005 Aug; Vol. 289 (2), pp. C415-24. Date of Electronic Publication: 2005 Apr 06. |
| DOI: |
10.1152/ajpcell.00289.2004 |
| Abstrakt: |
P-selectin glycoprotein ligand-1 (PSGL-1) has been proposed as an important tethering ligand for E-selectin and is expressed at a modest level on human leukocytes. Sialyl Lewis x (sLe(x))-like glycans bind to E-selectin and are expressed at a relatively high level on circulating leukocytes. It is unclear whether PSGL-1 has unique biochemical attributes that contribute to its role as an E-selectin ligand. To probe this issue, we conjugated microspheres with either sLe(x) or PSGL-1 purified from myeloid cells (neutrophils and HL-60) and compared their adhesion to endothelial expressed E-selectin under defined shear conditions. We found that both sLe(x) and PSGL-1 microspheres adhere to 4 h of IL-1beta-activated human umbilical vein endothelial cells predominantly through E-selectin. Analysis of the adhesion revealed that the rate of initial tethering of the PSGL-1 microspheres to E-selectin was significantly greater than the rate of initial tethering of the sLe(x) microspheres despite the fact that the sLe(x) microspheres tested had higher ligand densities than the PSGL-1 microspheres. We also found that pretreatment of the PSGL-1 or sLe(x) microspheres with HECA-452 had no significant effect on initial tethering to E-selectin. These results support the hypotheses that 1) PSGL-1 is a high-efficiency tethering ligand for E-selectin, 2) ligand biochemistry can significantly influence initial tethering to E-selectin, and 3) PSGL-1 tethering to E-selectin can occur via non-HECA-452 reactive epitopes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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