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. 1986 Oct;60(1):68–81. doi: 10.1128/jvi.60.1.68-81.1986

Generation and characterization of a recombinant Moloney murine leukemia virus containing the v-myc oncogene of avian MC29 virus: in vitro transformation and in vivo pathogenesis.

B K Brightman, P K Pattengale, H Fan
PMCID: PMC253903  PMID: 3018301

Abstract

A new retrovirus consisting of the v-myc oncogene sequences of avian MC29 virus inserted into the genome of Moloney murine leukemia virus (M-MuLV) was generated. This was accomplished by constructing a recombinant DNA clone containing the desired organization, introducing the recombinant DNA into mouse NIH 3T3 cells, and superinfecting the cells with replication-competent M-MuLV. The construction was designed so that an M-MuLV gag-myc fusion protein would be produced. The resulting virus, M-MuLV(myc), morphologically transformed uninfected NIH 3T3 cells. Stocks of M-MuLV(myc)-M-MuLV were infected into secondary mouse embryo cultures. M-MuLV(myc) induced striking growth and proliferation of hematopoietic cells. These cells were of the myeloid lineage by morphology, phagocytic properties, and surface staining with Mac-1 and Mac-2 monoclonal antibodies. They resembled mature macrophages, although they displayed minor properties of immaturity. The myeloid cells were transformed in comparison with uninfected myeloid cells since they were less adherent and had unlimited proliferative capacity and reduced growth factor requirements. The transformed myeloid cells with proliferative potential were actually myeloid progenitors which apparently underwent terminal differentiation to macrophages. It was possible to derive a permanent line of factor-independent macrophages from M-MuLV(myc)-transformed myeloid cells. M-MuLV(myc) also immortalized and morphologically transformed mouse embryo fibroblasts. These in vitro properties closely resembled the biological activity of MC29 virus in avian cells and suggested that the nature of the v-myc oncogene was an important determinant in transformation specificity. Neonatal NIH Swiss mice inoculated intraperitoneally with M-MuLV(myc)-M-MuLV only developed lymphoblastic lymphoma characteristic of the M-MuLV helper alone, and no acute fibrosarcomas or myeloid tumors resulted. In light of the strong myeloid transformation observed in vitro, the absence of acute in vivo myeloid disease was noteworthy. Interestingly, when a derivative of M-MuLV(myc) carried by a nonpathogenic amphotropic MuLV helper was inoculated, T lymphomas developed with long latency. Molecular hybridization confirmed that these tumors contained M-MuLV(myc).

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