title: Nf1 deficiency causes Ras-mediated granulocyte/macrophage colony stimulating factor hypersensitivity and chronic myeloid leukaemia.
abstract: The Ras signal transduction pathway is often deregulated in human myeloid leukaemia. For example, activating point mutations in RAS genes are found in some patients with juvenile chronic myelogenous leukaemia (JCML), while other patients with JCML show loss of the neurofibromatosis type 1 (NF1) gene, a Ras GTPase activating protein. By generating mice whose haematopoietic system is reconsituted with Nf1 deficient haematopoietic stem cells we show that Nf1 gene loss, by itself, is sufficient to produce the myeloproliferative symptoms associated with human JCML. We also provide evidence to indicate that Nf1 gene loss induces myeloproliferative disease through a Ras-mediated hypersensitivity to granulocyte/macrophage-colony stimulating factor (GM-CSF). Finally, we describe a genetic screen for identifying genes that cooperate with Nf1 gene loss during progression to acute myeloid leukaemia.
authors.affiliation: Mammalian Genetics Laboratory, NCI-Frederick Cancer Research and Development Center, Maryland 21702, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Largaespada
authors.forename: C I
authors.initials: CI
authors.lastname: Brannan
authors.forename: N A
authors.initials: NA
authors.lastname: Jenkins
authors.forename: N G
authors.initials: NG
authors.lastname: Copeland
mesh_terms: D000208:Acute Disease; D000818:Animals; D001853:Bone Marrow / Q000276:immunology; D002454:Cell Differentiation; D002461:Cell Line, Transformed; D003433:Crosses, Genetic; D004195:Disease Models, Animal; D018450:Disease Progression; D005260:Female; D016514:Genes, Neurofibromatosis 1; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006160:Guanosine Triphosphate / Q000378:metabolism; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D007951:Leukemia, Myeloid; D008099:Liver / Q000166:cytology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D015398:Signal Transduction / Q000502:physiology; D018631:ras Proteins / Q000378:metabolism / Q000502:physiology*
chemical_list: D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006160:Guanosine Triphosphate; D018631:ras Proteins