title: Biologic properties in vitro of a recombinant human granulocyte-macrophage colony-stimulating factor.
abstract: Recombinant human granulocyte-macrophage colony-stimulating factor (rH GM-CSF) was purified to homogeneity from medium conditioned by COS cells transfected with a cloned human GM-CSF cDNA and shown to be an effective proliferative stimulus in human marrow cultures for GM and eosinophil colony formation. The specific activity of purified rH GM-CSF in human marrow cultures was calculated to be at least 4 X 10(7) U/mg protein. Clone transfer experiments showed that this proliferation was due to direct stimulation of responding clonogenic cells. Acting alone, rH GM-CSF did not stimulate erythroid colony formation, but in combination with erythropoietin, increased erythroid and multipotential colony formation in cultures of peripheral blood cells. rH GM-CSF had no proliferative effects on adult or fetal murine hematopoietic cells, did not induce differentiation in murine myelomonocytic WEHI-3B cells, and was unable to stimulate the survival or proliferation of murine hematopoietic cell lines dependent on murine multi-CSF (IL 3). rH GM-CSF stimulated antibody-dependent cytolysis of tumor cells by both mature human neutrophils and eosinophils and increased eosinophil autofluorescence and phagocytosis by neutrophils. From a comparison of these effects with those of semipurified preparations of human CSF alpha and -beta, it was concluded that rH GM-CSF exhibited all the biologic activities previously noted for CSF alpha.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D001853:Bone Marrow / Q000187:drug effects; D002478:Cells, Cultured; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D004804:Eosinophils / Q000187:drug effects; D004920:Erythropoiesis / Q000187:drug effects; D006098:Granulocytes; D006412:Hematopoietic Stem Cells / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D008264:Macrophages; D051379:Mice; D008808:Mice, Inbred CBA; D009504:Neutrophils / Q000187:drug effects; D011994:Recombinant Proteins / Q000494:pharmacology*
chemical_list: D003115:Colony-Stimulating Factors; D011994:Recombinant Proteins