title: Clonal analysis of the action of GM-CSF on the proliferation and differentiation of myelomonocytic leukemic cells.
abstract: With 214 subclones of the BALB/c myelomonocytic leukemia WEHI-3B, the granulocyte-macrophage colony-stimulating factor (GM-CSF) in impure or purified form, consistently increased the proportion of colonies exhibiting partial or complete differentiation in agar cultures. GM-CSF also increased colony size and content of daughter colony-forming cells. Serial recloning of WEHI-3B colonies in the presence of GM-CSF showed that when colonies differentiated completely, self-replication of the colony-forming cell was suppressed (clonal extinction). However, WEHI-3B cells exhibited clonal instability and even in the continuous presence of GM-CSF many colony-forming cells still generated cells able to form undifferentiated colonies. It appears unlikely that GM-CSF can completely suppress the progressive proliferation of a myeloid leukemic population of the WEHI-3B type.
mesh_terms: D000818:Animals; D002455:Cell Division; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002999:Clone Cells; D003114:Colony-Forming Units Assay; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D006098:Granulocytes / Q000276:immunology*; D007942:Leukemia, Experimental / Q000276:immunology; D007951:Leukemia, Myeloid / Q000276:immunology*; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D014185:Transplantation, Isogeneic
chemical_list: D003115:Colony-Stimulating Factors