title: Control of granulopoiesis in man.III. inhibition of colony formation by dense leukocytes.
abstract: Cellular feeder layers, prepared from normal blood leukocytes, usually stimulate human marrow to form colonies. A significant increase in the stimulating activity of unseparated leukocyte feeder layers is brought about following the removal of dense leukocytes in a manner which avoids enrichment of any remaining cell type. Restoration of dense leukocytes to a dense leukocyte depleted leukocyte feeder layer results in the reduction of stimulating activity to that of an unseparated leukocyte feeder; however, addition of dense leukocytes to unseparated leukocyte feeder layers has no effect on the stimulatory activity, over the range of concentrations used in this study.
mesh_terms: D001854:Bone Marrow Cells; D002999:Clone Cells; D003115:Colony-Stimulating Factors / Q000378:metabolism; D006098:Granulocytes; D006410:Hematopoiesis; D006801:Humans; D007962:Leukocytes
chemical_list: D003115:Colony-Stimulating Factors