Abstract
A retroviral vector, RIM, containing murine c-myc under the control of immunoglobulin heavy-chain gene promoter and enhancer elements and v-Ha-ras driven by a Moloney murine leukemia virus long terminal repeat induced IgM-secreting plasmacytomas in 28% of adult and 83% of 3-week-old pristane-conditioned mice with mean latency periods of 60-70 days. In contrast, the same vector only harboring c-myc or v-Ha-ras was virtually ineffective. RIM-induced plasmacytomas expressed retroviral myc and ras genes while their endogenous c-myc alleles were unrearranged and transcriptionally inactive. These plasmacytomas were clonal as each possessed a unique immunoglobulin heavy-chain joining region rearrangement and a single recombinant provirus. Moloney murine leukemia helper virus did not play an obligatory role in tumorigenesis since insertions of Moloney murine leukemia proviruses were found in only 6 of 24 plasmacytomas induced in adult mice. Taken together, these findings support the view that the v-Ha-ras oncogene can cooperate with an activated myc gene in pristane plasmacytomagenesis.
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Selected References
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