title: Purification of a multipotential colony-stimulating factor from pokeweed mitogen-stimulated mouse spleen cell conditioned medium.
abstract: A factor able to stimulate the proliferation and differentiation of multipotential stem cells and progenitor cells of the granulocyte-macrophage, eosinophil, and erythroid lineages as well as being able to maintain factor-dependent cell lines in culture has been purified from pokeweed mitogen-stimulated mouse spleen cell-conditioned medium. The factor was purified over 2 million-fold by sequential fractionation using salting out chromatography, chromatography on phenyl-Sepharose, gel filtration on Sephadex G-75, ion exchange chromatography on DEAE-Sepharose, reverse-phase high performance liquid chromatography on a phenyl-silica column, and gel permeation high performance liquid chromatography. All of the biological activities ascribed to the multipotential colony-stimulating factor co-fractionated through all steps, and the other known mouse-active hemopoietic regulator in pokeweed mitogen-stimulated mouse spleen cell-conditioned medium, granulocyte-macrophage colony-stimulating factor, was separated at the ion exchange step. Two protein species having Mr = 24,000 and 19,000 were visualized by silver-staining of sodium dodecyl sulfate-polyacrylamide gels of the purified factor. Both species migrated coincidently with the biological activities. The factor was active at a half-maximal concentration of 1 X 10(-13) M when assayed on a factor-dependent cell line.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D003470:Culture Media; D004591:Electrophoresis, Polyacrylamide Gel; D007335:Insulin-Like Growth Factor II; D051379:Mice; D008807:Mice, Inbred BALB C; D010455:Peptides / Q000302:isolation & purification*; D011043:Pokeweed Mitogens / Q000494:pharmacology*; D013154:Spleen / Q000032:analysis*
chemical_list: D003470:Culture Media; D010455:Peptides; D011043:Pokeweed Mitogens; D007335:Insulin-Like Growth Factor II