| Autor: |
Jutila MA; Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717, USA. uvsmj@montana.edu, Kurk S, Jackiw L, Knibbs RN, Stoolman LM |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of immunology (Baltimore, Md. : 1950) [J Immunol] 2002 Aug 15; Vol. 169 (4), pp. 1768-73. |
| DOI: |
10.4049/jimmunol.169.4.1768 |
| Abstrakt: |
Previous studies reported that L-selectin (CD62L) on human peripheral blood neutrophils serves as an E-selectin ligand. This study shows that CD62L acquired E-selectin-binding activity following phorbol ester (PMA) treatment of the Jurkat T cell line and anti-CD3/IL-2-driven proliferation of human T lymphocytes in vitro. The recombinant porcine E-selectin/human Ig chimera P11.4 showed neuraminidase-sensitive and calcium-dependent attachment to PMA-stimulated human Jurkat T cells in a flow cytometry assay. The anti-CD62L mAb (DREG 56) blocked this binding interaction by approximately 60% and P11.4 precipitated CD62L from detergent lysates of PMA-activated Jurkat cells. In contrast, P11.4 precipitated minimal amounts of CD62L from detergent lysates of nonactivated human PBL. As reported previously, P-selectin glycoprotein ligand 1 and a distinct 130-kDa glycoprotein were the major species in these precipitates. However, T cell activation on plate-immobilized anti-CD3 and growth in low-dose IL-2 increased the percentage of CD62L molecules with E-selectin-binding activity. After two cycles of activation and culture, approximately 60-70% of the CD62L was precipitated with the P11.4 chimera. These cultured T lymphoblasts rolled avidly on both E-selectin and P-selectin at physiologic levels of linear shear stress. The DREG 56 Ab partially blocked rolling on the E-selectin substrate, whereas no effect was seen on P-selectin. Thus, CD62L on human cultured T lymphoblasts is one of several glycoproteins that interacts directly with E-selectin and contributes to rolling under flow. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
