title: Involvement of ras p21 protein in signal-transduction pathways from interleukin 2, interleukin 3, and granulocyte/macrophage colony-stimulating factor, but not from interleukin 4.
abstract: The protooncogene ras acts as a component of signal-transduction networks in many kinds of cells. The ras gene product (p21) is a GTP-binding protein, and the activity of the protein is regulated by bound GDP/GTP. Recent studies have shown that a certain class of growth factors stimulates the formation of active p21-GTP complexes in fibroblasts and that oncogene products with enhanced tyrosine kinase activities have a similar effect on ras p21. We have measured the ratio of active GTP-bound p21 to total p21 in several lymphoid and myeloid cell lines in order to understand the role of ras in the proliferation of these cells. Interleukin 2 (IL-2), IL-3, and granulocyte/macrophage colony-stimulating factor (GM-CSF) enhance the formation of the active p21.GTP, whereas IL-4 has no effect on p21-bound GDP/GTP. These results strongly suggest that ras p21 acts as a transducer of signals from IL-2, IL-3, and GM-CSF, but not from IL-4.
authors.affiliation: DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104.
authors.forename: T
authors.initials: T
authors.lastname: Satoh
authors.forename: M
authors.initials: M
authors.lastname: Nakafuku
authors.forename: A
authors.initials: A
authors.lastname: Miyajima
authors.forename: Y
authors.initials: Y
authors.lastname: Kaziro
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology; D002460:Cell Line; D004815:Epidermal Growth Factor / Q000494:pharmacology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000502:physiology*; D006153:Guanosine Diphosphate / Q000378:metabolism; D006160:Guanosine Triphosphate / Q000378:metabolism; D066298:In Vitro Techniques; D007378:Interleukins / Q000502:physiology*; D015759:Ionomycin / Q000494:pharmacology; D008214:Lymphocytes / Q000502:physiology*; D051379:Mice; D011493:Protein Kinase C / Q000502:physiology; D016283:Proto-Oncogene Proteins p21(ras) / Q000502:physiology*; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor / Q000502:physiology*; D015375:Receptors, Interleukin-2 / Q000502:physiology*; D016185:Receptors, Interleukin-3 / Q000502:physiology*; D019948:Receptors, Interleukin-4; D011975:Receptors, Mitogen / Q000502:physiology*; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D007378:Interleukins; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor; D015375:Receptors, Interleukin-2; D016185:Receptors, Interleukin-3; D019948:Receptors, Interleukin-4; D011975:Receptors, Mitogen; D006153:Guanosine Diphosphate; D015759:Ionomycin; D004815:Epidermal Growth Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006160:Guanosine Triphosphate; D011493:Protein Kinase C; D016283:Proto-Oncogene Proteins p21(ras); D013755:Tetradecanoylphorbol Acetate; D002118:Calcium