Abstract
Multiple myeloma (MM) is characterized by recurrent chromosomal translocations. In t(4;14) MM, the MM SET domain (MMSET) protein is universally overexpressed and has been suggested to have an important tumorigenic role. However, the exact molecular targets underlying MMSET activity are not well understood. Here, we found in t(4;14) MM cells that MMSET knockdown decreases interferon regulatory factor 4 (IRF4) expression, and ectopic MMSET increases IRF4 expression, suggesting that MMSET is an upstream regulator of IRF4. Further analyses indicated an interaction between MMSET and nuclear factor-κB, which both bind to the IRF4 promoter region. A luciferase reporter assay showed that MMSET is an important functional element for the IRF4 promoter. MMSET knockdown induces apoptosis and potentiates the effects of bortezomib in vitro and in vivo. Importantly, we found that bortezomib could reduce expression of MMSET and IRF4. This might partly explain the additive effect of combining MMSET knockdown and bortezomib treatment. These results identify MMSET as a key regulator involved in the regulatory network of transcription factor IRF4, which is critical for MM cell survival, suggesting that the combination of MMSET inhibition and bortezomib is likely to improve patient outcome in MM.
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Acknowledgements
This work was supported by the National Medical Research Council of Singapore Grant NMRC/BNIG/2006/2013 and the National Research Foundation Singapore and the Singapore Ministry of Education under its Research Centers of Excellence initiative. WJC is supported by NMRC Clinician Scientist Investigator award.
Author contributions
ZX designed the research, performed the experiments and wrote the manuscript; CB performed gene expression microarray experiment; JYC, ZLC and NM helped with animal experiments; and WJC designed the research and wrote the manuscript.
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Xie, Z., Bi, C., Chooi, J. et al. MMSET regulates expression of IRF4 in t(4;14) myeloma and its silencing potentiates the effect of bortezomib. Leukemia 29, 2347–2354 (2015). https://doi.org/10.1038/leu.2015.169
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DOI: https://doi.org/10.1038/leu.2015.169
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