title: Synergism of v-myc and v-Ha-ras in the in vitro neoplastic progression of murine lymphoid cells.
abstract: Murine bone marrow was either singly or doubly infected with retroviral vectors expressing v-myc (OK10) or v-Ha-ras. The infected bone marrow was cultured in a system that supports the long-term growth of B-lineage lymphoid cells. While the v-myc vector by itself had no apparent effect on lymphoid culture establishment and growth, infection with the v-Ha-ras vector or coinfection with both v-myc and v-Ha-ras vectors led to the appearance of growth-stimulated cell populations. Clonal pre-B-cell lines stably expressing v-Ha-ras alone or both v-myc and v-Ha-ras grew out of these cultures. In comparison with cell lines expressing v-Ha-ras alone, cell lines expressing both v-myc and v-Ha-ras grew to higher densities, had reduced dependence on a feeder layer for growth, and had a marked increase in ability to grow in soft-agar medium. The cell lines expressing both oncogenes were highly tumorigenic in syngeneic animals. These experiments show that the v-myc oncogene in synergy with v-Ha-ras can play a direct role in the in vitro transformation of murine B lymphoid cells.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002448:Cell Adhesion; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D005822:Genetic Vectors; D006251:Harvey murine sarcoma virus / Q000235:genetics; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D008214:Lymphocytes / Q000166:cytology*; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics; D051379:Mice; D008979:Moloney murine leukemia virus / Q000235:genetics; D009693:Nucleic Acid Hybridization; D009857:Oncogenes