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Published online 11 June 2001. doi:10.1083/jcb.153.6.1277
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© The Rockefeller University Press, 0021-9525/2001/6/1277/ $5.00
The Journal of Cell Biology, Volume 153, Number 6, June 11, 2001 1277-1286


Original Article

CD44 Is a Major E-Selectin Ligand on Human Hematopoietic Progenitor Cells

Charles J. Dimitroffa,d, Jack Y. Leea,d, Shahin Rafiie, Robert C. Fuhlbriggea,d, and Robert Sacksteina,b,c,d
a Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts 02115
b Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115
c Bone Marrow Transplant Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114
d Harvard Skin Disease Research Center, Harvard Medical School, Boston, Massachusetts, 02115
e Division of Hematology-Oncology, New York Hospital Cornell Medical Center, New York, New York 10021

Correspondence to: Robert Sackstein, Harvard Institutes of Medicine, 77 Ave. Louis Pasteur, Room 671, Boston, MA 02115. Tel:(617) 525-5601 Fax:(617) 525-5571 E-mail:rsackstein{at}rics.bwh.harvard.edu.

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.

Key Words: hematopoietic stem cells, E-selectin, CD44, PSGL-1, CLA


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