title: Purification of a factor inducing differentiation in murine myelomonocytic leukemia cells. Identification as granulocyte colony-stimulating factor.
abstract: A naturally occurring inducer of terminal differentiation in a murine myelomonocytic leukemia cell line (WEHI-3B) was purified to apparent homogeneity from medium conditioned by lungs from mice injected with bacterial endotoxin. The factor was purified over 400,000-fold by sequential fractionation using salting out chromatography, chromatography on phenyl-Sepharose, gel filtration on Bio-Gel P-60 in 1 M acetic acid, reverse-phase high performance liquid chromatography on a phenyl-silica column, and high performance liquid chromatography on a gel filtration column. During the first two steps, the differentiation-inducing factor was separated completely from a known proliferative regulator for normal myeloid cells, granulocyte-macrophage colony-stimulating factor, but it co-purified through all remaining steps with a distinct granulocyte-specific colony-stimulating factor. The purified factor showed a single protein band of Mr = 24,000-25,000 on sodium dodecyl sulfate-polyacrylamide gels coincident with both differentiation-inducing and granulocyte colony-stimulating activity. The granulocyte-specific colony-stimulating factor was active on WEHI-3B cells and normal granulocytic progenitor cells in vitro at the same half-maximally active concentration of 3 X 10(-12) M.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002850:Chromatography, Gel; D003115:Colony-Stimulating Factors / Q000302:isolation & purification* / Q000502:physiology; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor; D006098:Granulocytes / Q000502:physiology*; D007700:Kinetics; D007942:Leukemia, Experimental / Q000503:physiopathology*; D007951:Leukemia, Myeloid / Q000503:physiopathology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008970:Molecular Weight
chemical_list: D003115:Colony-Stimulating Factors; D016179:Granulocyte Colony-Stimulating Factor