Human hematopoietic progenitor cell isolation based on galactose-specific cell surface binding.

The ability to isolate functional populations of hematopoietic progenitor cells is important to the process of hematopoietic cell transplantation and to the understanding of hematopoietic cell biology in health and disease. We show that a subpopulation of human bone marrow hematopoietic cells bearing the pan-hematopoietic antigen CD34 also binds galactose-conjugated proteins. This lectin-positive sub-population represents approximately 0.1 to 0.5% of the total bone marrow cells, and contains 100% of the hematopoietic progenitor cells. The galactose-binding lectin on these cells is specific for this sugar. Additionally, highly proliferative hematopoietic progenitor cells with very primitive phenotypes, including a newly identified progenitor cell that produces multiple lineages, express this lectin.