title: Repression of rearranged mu gene and translocated c-myc in mouse 3T3 cells X Burkitt lymphoma cell hybrids.
abstract: The productively rearranged immunoglobulin mu chain gene and the translocated cellular oncogene c-myc are transcribed at high levels both in human Burkitt lymphoma cells carrying the t(8;14) chromosome translocation and in mouse plasmacytoma X Burkitt lymphoma cell hybrids. In the experiments reported here these genes were found to be repressed in mouse 3T3 fibroblast X Burkitt lymphoma cell hybrids. Such repression probably occurs at the transcriptional level since no human mu- and c-myc messenger RNA's are detectable in hybrid clones carrying the corresponding genes. It is therefore concluded that the ability to express these genes requires a differential B cell environment. The results suggest that the 3T3 cell assay may not be suitable to detect oncogenes directly involved in human B cell oncogenesis, since 3T3 cells apparently are incapable of transcribing an oncogene that is highly active in malignant B cells with specific chromosomal translocations.
mesh_terms: D000818:Animals; D002051:Burkitt Lymphoma / Q000235:genetics*; D005347:Fibroblasts; D005786:Gene Expression Regulation; D005796:Genes; D006801:Humans; D006822:Hybrid Cells / Q000378:metabolism*; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D007148:Immunoglobulin mu-Chains / Q000235:genetics*; D051379:Mice; D009857:Oncogenes; D012333:RNA, Messenger / Q000235:genetics; D014158:Transcription, Genetic; D014178:Translocation, Genetic
chemical_list: D007143:Immunoglobulin Heavy Chains; D007148:Immunoglobulin mu-Chains; D012333:RNA, Messenger