MicroRNA-124 links p53 to the NF-kappa B pathway in B-cell lymphomas

Title
MicroRNA-124 links p53 to the NF-kappa B pathway in B-cell lymphomas
Author(s)
D Jeong[D Jeong]J Kim[J Kim]J Nam[J Nam]H Sun[H Sun]이윤한[이윤한]이태진RCT Aguiar[RCT Aguiar]김상우[김상우]
Keywords
RITUXIMAB PLUS CYCLOPHOSPHAMIDE; PHOSPHODIESTERASE 4B; CANCER; MYC; EXPRESSION; NETWORK; PATHOGENESIS; VINCRISTINE; DOXORUBICIN; PREDNISONE
Issue Date
201509
Publisher
NATURE PUBLISHING GROUP
Citation
LEUKEMIA, v.29, no.9, pp.1868 - 1874
Abstract
The contribution of microRNAs to lymphoma biology is not fully understood. In particular, it remains untested whether microRNA dysregulation could contribute to the emergence of the aggressive subset of B-cell lymphomas that coexpress MYC and BCL2. Here, we identify microRNA-124 (miR-124) as a negative regulator of MYC and BCL2 expression in B-cell lymphomas. Concordantly, stable or transient ectopic expression of miR-124 suppressed cell proliferation and survival, whereas genetic inhibition of this miRNA enhanced the fitness of these tumors. Mechanistically, the activities of miR-124 towards MYC and BCL2 intersect with both oncogenic and tumor-suppressive pathways. In respect to the former, we show that miR-124 directly targets nuclear factor-kappa B (NF-kappa B) p65, and using genetic approaches, we demonstrate that this interaction accounts for the miR-124-mediated suppression of MYC and BCL2. We also characterized miR-124 promoter region and identified a functional p53 binding site. In agreement with this finding, endogenous or ectopic expression of wild-type, but not mutant, p53 increased miR-124 levels and suppressed p65, MYC and BCL2. Our data unveil an miRNA-dependent regulatory circuitry that links p53 to the NF-kappa B pathway, which when disrupted in B-cell lymphoma may be associated with aberrant coexpression of MYC and BCL2 and poor prognosis.
URI
http://hdl.handle.net/YU.REPOSITORY/31015http://dx.doi.org/10.1038/leu.2015.101
ISSN
0887-6924
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의과대학 > 해부학교실 > Articles
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