title: Rapid induction of IgM-secreting murine plasmacytomas by pristane and an immunoglobulin heavy-chain promoter/enhancer-driven c-myc/v-Ha-ras retrovirus.
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.
mesh_terms: D000818:Animals; D004742:Enhancer Elements, Genetic; D005803:Genes, Immunoglobulin; D007143:Immunoglobulin Heavy Chains / Q000378:metabolism*; D007075:Immunoglobulin M / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008811:Mice, Inbred DBA; D010954:Plasmacytoma / Q000209:etiology* / Q000276:immunology; D011401:Promoter Regions, Genetic; D011519:Proto-Oncogenes; D011995:Recombination, Genetic; D012190:Retroviridae / Q000235:genetics*; D013729:Terpenes / Q000494:pharmacology*
chemical_list: D007143:Immunoglobulin Heavy Chains; D007075:Immunoglobulin M; D013729:Terpenes; C009042:pristane