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2016 ; 14
(5
): 4567-4574
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MicroRNA expression profiles of granulocytic myeloid?derived suppressor cells
from mice bearing Lewis lung carcinoma
#MMPMID27748875
Jiang J
; Gao Q
; Wang T
; Lin H
; Zhan Q
; Chu Z
; Huang R
; Zhou X
; Liang X
; Guo W
Mol Med Rep
2016[Nov]; 14
(5
): 4567-4574
PMID27748875
show ga
Myeloid-derived suppressor cells (MDSCs) are a group of heterogeneous myeloid
cells that can suppress antitumor immunity. MDSCs are divided into granulocytic
(G?MDSCs) and monocytic subsets. In the present study, the microRNA profiles of
the G?MDSCs were determined and the differential expression of microRNAs between
G?MDSCs from tumor?bearing mice and tumor?free mice was examined. The number of
G?MDSCs in spleens of Lewis lung carcinoma (LLC)?bearing mice was ~6?fold higher
than in spleens of normal mice (13.54±1.74% vs. 2.14±1.44%; P<0.01) and G?MDSCs
account for about 72.9% of all MDSCs. The microRNA (miRNA) profiles of the
G?MDSCs from spleen of LLC?bearing mice were obtained using a microRNA microarray
and compared with their counterparts from spleens of tumor?free mice. A total of
43 miRNAs with >1.3?fold increased or decreased change were differentially
expressed between the experimental and control group mice. The levels of nine of
these differentially expressed miRNAs, miRNA?468 (miR?486), miR?192, miR?128,
miR?125a, miR?149, miR?27a, miR?125b, miR?350 and miR?328, were also analyzed by
RT?qPCR to validate the microarray data. The concordance rate between the results
tested by the two methods was 88.9%. Bioinformatics analyses revealed that these
miRNAs may act on various target genes, including Adar, Pik3r1, Rybp and Rabgap1,
to regulate the survival, differentiation and the function of tumor?induced
granulocytic MDSCs. The results revealed microRNAs and potential targets that may
be vital for regulating survival, differentiation and function of G?MDSCs induced
by LLC. Further investigation should be performed to clarify the roles of these
microRNAs in regulating LLC?induced granulocytic MDSCs and the target genes that
mediate their functions.