title: Enhanced expression of the granulocyte-macrophage colony stimulating factor gene in acute myelocytic leukemia cells following in vitro blast cell enrichment.
abstract: Expression of the granulocyte-macrophage colony-stimulating factor (GM-CSF) gene in acute myelocytic leukemia (AML) was assayed by Northern blot analysis. GM-CSF messenger RNA (mRNA) was detected in the freshly obtained mononuclear cells of only one of 48 cases of AML, in contrast with recent reports that GM-CSF mRNA might be detected in half of the cases of AML when RNA is prepared from T-cell- and monocyte-depleted leukemic cells. We did find, however, that expression of the GM-CSF gene was detectable in five of ten cases after in vitro T-cell and monocyte depletion steps. Additional studies suggest that expression of GM-CSF in the bone marrow of the one positive case, rather than being autonomous, was under exogenous control, possibly by a paracrine factor secreted by marrow stromal cells. These studies emphasize the potential for altering in vivo patterns of gene expression by in vitro cell manipulation.
mesh_terms: D002469:Cell Separation; D003115:Colony-Stimulating Factors / Q000235:genetics* / Q000378:metabolism; D005796:Genes; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006133:Growth Substances / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000378:metabolism; D014411:Neoplastic Stem Cells / Q000378:metabolism / Q000473:pathology*; D012333:RNA, Messenger / Q000302:isolation & purification; D014158:Transcription, Genetic
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D012333:RNA, Messenger; D016178:Granulocyte-Macrophage Colony-Stimulating Factor