Expression of functional P-selectin glycoprotein ligand 1 on hematopoietic progenitors is developmentally regulated.

Progenitors Is Developmentally Regulated Glycoprotein Ligand 1 on Hematopoietic Expression of Functional P-Selectin

Primitive human hematopoietic progenitors adhere to P-selectin (CD62P).

P-selectin was shown to bind committed human hematopoietic progenitors (colony-forming unit-granulocyte-macrophage [CFU-GM] and burst-forming unit-erythroid [BFU-E]) as identified by their expression of the CD34 antigen and by in vitro clonogenic assays. In addition, P-selectin bound all precursors (pre-CFU) of committed myeloid progenitors assayed by their ability to sustain hematopoiesis in b...

A hematopoietic cell L-selectin ligand that is distinct from PSGL-1 and displays N-glycan-dependent binding activity.

Human hematopoietic progenitor cells express L-selectin and also express PSGL-1, a ligand for all selectins. Using a shear-based adhesion assay, a hematopoietic cell L-selectin ligand (HCLL) that is expressed on the hematopoietic cell line KG1a and on normal human hematopoietic progenitors was previously identified. To characterize the structural biology of HCLL and to define its relationship t...

Functional selectin ligands mediating human CD34(+) cell interactions with bone marrow endothelium are enhanced postnatally.

Hematopoietic progenitor cells (HPCs) can home to the bone marrow (BM) after a simple intravenous injection, but the adhesive mechanisms mediating the initial interactions of human HPCs with the BM endothelium have not been evaluated in vivo. Using fluorescence intravital microscopy and homing assays in NOD/SCID mice, we show that endothelial selectins are necessary for human adult CD34(+) cell...

P-selectin glycoprotein ligand 1 is a ligand for L-selectin on neutrophils, monocytes, and CD34+ hematopoietic progenitor cells

Selectins play a critical role in initiating leukocyte binding to vascular endothelium. In addition, in vitro experiments have shown that neutrophils use L-selectin to roll on adherent neutrophils, suggesting that they express a nonvascular L-selectin ligand. Using a L-selectin/IgM heavy chain (mu) chimeric protein as an immunocytological probe, we show here that L-selectin can bind to neutroph...