Hypoxia‐inducible micro RNA ‐210 regulates the DIMT 1‐ IRF 4 oncogenic axis in multiple myeloma
Multiple myeloma ( MM ) is characterized by the accumulation of a population of malignant plasma cells within the bone marrow and its microenvironment. A hypoxic niche is located within the microenvironment, which causes myeloma cells to become quiescent, anti‐apoptotic, glycolytic, and immature. Ce...
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Published in | Cancer science Vol. 108; no. 4; pp. 641 - 652 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.04.2017
|
Online Access | Get full text |
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Summary: | Multiple myeloma (
MM
) is characterized by the accumulation of a population of malignant plasma cells within the bone marrow and its microenvironment. A hypoxic niche is located within the microenvironment, which causes myeloma cells to become quiescent, anti‐apoptotic, glycolytic, and immature. Cell heterogeneity may be related to distinct gene expression profiles under hypoxic and normoxic conditions. During hypoxia, myeloma cells acquire these phenotypes by downregulating interferon regulatory factor 4 (
IRF
4), an essential transcription factor in myeloma oncogenesis. To identify essential micro
RNA
s and their targets regulated under hypoxic conditions, we undertook micro
RNA
and c
DNA
microarray analyses using hypoxia‐exposed primary
MM
samples and myeloma cell lines. Under hypoxia, only miR‐210 was highly upregulated and was accompanied by direct downregulation of an 18S r
RNA
base methyltransferase,
DIMT
1. This inverse expression correlation was validated by quantitative
RT
‐
PCR
for primary
MM
samples. We further determined that
DIMT
1 has an oncogenic potential as its knockdown reduced tumorigenicity of myeloma cells through regulation of
IRF
4 expression. Notably, by analyzing gene expression omnibus datasets in the National Center for Biotechnology Information database, we found that
DIMT
1
expression increased gradually with
MM
progression. In summary, by screening for targets of hypoxia‐inducible micro
RNA
‐210, we identified
DIMT
1 as a novel diagnostic marker and therapeutic target for all molecular subtypes of
MM
. |
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ISSN: | 1347-9032 1349-7006 |
DOI: | 10.1111/cas.13183 |