title: Selective expression of fos proto-oncogene in human acute myelomonocytic and monocytic leukemias: a molecular marker of terminal differentiation.
abstract: Expression of human fos proto-oncogene (c-fos) was analyzed in primary cells from 50 untreated acute lymphocytic (ALL) and myeloblastic (AML) leukemias. c-fos RNA, analyzed by blot hybridization, was detected virtually only in myelomonocytic (M4) and monocytic (M5) AML. Both M4 and M5 samples show a strong positive correlation between the amount of c-fos transcripts and the percentage of leukemic cells expressing surface antigens specific for mature monocytes and macrophages. Normal mature monocytes exhibit a detectable level of c-fos RNA, which is virtually unaltered on activation to macrophage differentiation, but is always below that observed in M4 through M5 monocyticlike cells. These data provide evidence that c-fos expression is linked to terminal monocyte and macrophage differentiation in normal and leukemic hemopoiesis.
mesh_terms: D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D002454:Cell Differentiation; D005786:Gene Expression Regulation; D006801:Humans; D007948:Leukemia, Monocytic, Acute / Q000235:genetics* / Q000276:immunology; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000276:immunology; D009000:Monocytes / Q000502:physiology*; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D011519:Proto-Oncogenes; D012333:RNA, Messenger / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics
chemical_list: D000951:Antigens, Neoplasm; D000954:Antigens, Surface; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm