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Cd44 Is a Major E-Selectin Ligand on Human Hematopoietic Progenitor Cells
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| Zeitschriftentitel: | The Journal of Cell Biology |
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| Personen und Körperschaften: | , , , , |
| In: | The Journal of Cell Biology, 153, 2001, 6, S. 1277-1286 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Rockefeller University Press
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| Schlagwörter: |
| Zusammenfassung: | <jats:p>E-selectin plays a critical role in mediating tissue-specific homing of T cells into skin, and of primitive hematopoietic progenitor cells (HPCs) into bone marrow (BM). Though it is known that a glycoform of PSGL-1 (CLA) functions as the principal E-selectin ligand on human T lymphocytes, the E-selectin ligand(s) of human HPCs has not been identified. We used a shear-based adherence assay to analyze and define the E-selectin ligand activity of membrane proteins from human HPCs. Our data show that PSGL-1 expressed on human HPCs is an E-selectin ligand, and that HPCs also express a previously unrecognized E-selectin ligand, CD44. The E-selectin ligand activity of CD44 is conferred by the elaboration of sialylated, fucosylated binding determinants on N-glycans. This glycoform of CD44 is expressed on primitive CD34+ human HPCs, but not on more mature hematopoietic cells. Under physiologic flow conditions, this molecule mediates E-selectin–dependent rolling interactions over a wider shear range than that of PSGL-1, and promotes human HPC rolling interactions on E-selectin expressed on human BM endothelial cells. These findings offer new insights into the structural biology and physiology of CD44, and into the molecular basis of E-selectin–dependent adhesive interactions that direct homing of human HPC to BM.</jats:p> |
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| Umfang: | 1277-1286 |
| ISSN: |
1540-8140
0021-9525 |
| DOI: | 10.1083/jcb.153.6.1277 |