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Leukemia. 2010 Jun;24(6):1171-8. doi: 10.1038/leu.2010.50. Epub 2010 Apr 15.

Ectopic expression of wild-type FGFR3 cooperates with MYC to accelerate development of B-cell lineage neoplasms.

Author information

  • 1Genetics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20889-5105, USA.

Abstract

The t(4;14) translocation in multiple myeloma (MM) simultaneously dysregulates two apparent oncogenes: fibroblast growth factor receptor 3 (FGFR3) controlled by the 3' immunoglobulin heavy chain enhancer on der(14) and MMSET controlled by the intronic Emu enhancer on der(4). Although all MM tumors and cell lines with a t(4;14) translocation have dysregulated MMSET, about 25% do not express FGFR3. Therefore, the function of dysregulated wild-type (WT) FGFR3 in the pathogenesis of MM remains unclear. We developed a murine transgenic (TG) model in which WT FGFR3 is overexpressed in B lymphoid cells. Although high levels of FGFR3 resulted in lymphoid hyperplasia in about one-third of older mice, no increase in tumorigenesis was observed. However, double TG FGFR3/Myc mice develop mature B lymphoma tumors that occur with a higher penetrance and shorter latency than in single TG Myc mice (P=0.006). We conclude that expression of high levels of WT FGFR3 can be oncogenic and cooperate with MYC to generate B lymphoid tumors. This suggests that dysregulated FGFR3 expression is likely to be essential at least for the early stages of pathogenesis of MM tumors that have a t(4;14) translocation.

PMID:
20393505
[PubMed - indexed for MEDLINE]
PMCID:
PMC3118571
Free PMC Article

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