Hemopoietic lineage switch: v-raf oncogene converts Emu-myc transgenic B cells into macrophages.
Hemopoietic lineage commitment can be breached by concomitant expression of the c-myc and v-raf oncogenes. Switching to the myeloid lineage occurred frequently when B lineage cells, from either lymphomas or preleukemia bone marrow cells of Emu-myc transgenic mice, were infected with a retrovirus bearing v-raf. Cloned pre-B and B cell lines changed into either mature or immature macrophages as assessed by morphology, adherence, phagocytic activity, surface markers, and lysozyme production, but retained clonotypic immunoglobulin gene rearrangements. Although expression of the Emu-myc transgene was reduced or abolished in the more differentiated lines, the lines remained tumorigenic. The converted lines produced the myeloid growth factor GM-CSF, and most had karyotypic alterations. These results suggest that constitutive myc plus raf expression can provoke genetic reprogramming in lymphocytes.
Klinken
S P
SP
Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Parkville, Victoria, Australia.
Alexander
W S
WS
Adams
J M
JM
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology*; D002454:Cell Differentiation; D002471:Cell Transformation, Neoplastic; D004247:DNA / Q000032:analysis; D005786:Gene Expression Regulation; D006410:Hematopoiesis; D007621:Karyotyping; D008223:Lymphoma; D008264:Macrophages / Q000166:cytology*; D051379:Mice; D008822:Mice, Transgenic; D009693:Nucleic Acid Hybridization; D027384:Oncogene Proteins v-raf; D009857:Oncogenes; D010587:Phagocytosis; D011289:Preleukemia; D011518:Proto-Oncogene Proteins / Q000235:genetics; D016271:Proto-Oncogene Proteins c-myc; D012313:RNA / Q000032:analysis; D012191:Retroviridae Proteins / Q000235:genetics; D014407:Tumor Cells, Cultured
D011518:Proto-Oncogene Proteins; D016271:Proto-Oncogene Proteins c-myc; D012191:Retroviridae Proteins; D012313:RNA; D004247:DNA; D027384:Oncogene Proteins v-raf