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2015 ; 5
(ä): 16437
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Inhibition of A20 expression in tumor microenvironment exerts anti-tumor effect
through inducing myeloid-derived suppressor cells apoptosis
#MMPMID26561336
Shao B
; Wei X
; Luo M
; Yu J
; Tong A
; Ma X
; Ye T
; Deng H
; Sang Y
; Liang X
; Ma Y
; Wu Q
; Du W
; Du J
; Gao X
; Wen Y
; Fu P
; Shi H
; Luo S
; Wei Y
Sci Rep
2015[Nov]; 5
(ä): 16437
PMID26561336
show ga
Myeloid-derived suppressor cells (MDSCs) are known to play important roles in the
development of immunosuppressive tumor microenvironment. A20 is a zinc-finger
protein which could negatively regulate apoptosis in several cell types. However,
the role of A20 in tumor microenvironment remains largely unknown. In this study,
we found that A20 was over-expressed in MDSCs. The treatment of tumor-bearing
mice with small interfering RNA targeting A20 (si-A20) inhibited the growth of
tumors. The infiltration of MDSCs was dramatically reduced after si-A20
treatment, as compared to control groups, whereas the numbers of dendritic cells
and macrophages were not affected. Also, injection of si-A20 improved T cell
mediated tumor-specific immune response. Depletion of MDSCs with anti-Gr1
antibody showed similar antitumor effect and improved T cell response. TNF-? was
highly expressed after si-A20 injection. Furthermore, si-A20 induced apoptosis of
MDSCs in the presence of TNF-? both in vivo and in vitro. Cleaved Caspase-3 and
Caspase-8 were elevated with the activation of JNK pathway after the induction of
MDSC apoptosis by si-A20. Thus, our findings suggested that knockdown of A20 in
tumor site inhibited tumor growth at least through inducing the apoptosis of
MDSCs. A20 might be a potential target in anticancer therapy.
|*Gene Expression
[MESH]
|Animals
[MESH]
|Apoptosis/*genetics/*immunology
[MESH]
|Cell Line, Tumor
[MESH]
|Cysteine Endopeptidases/*genetics
[MESH]
|Disease Models, Animal
[MESH]
|Gene Knockdown Techniques
[MESH]
|Humans
[MESH]
|Immune Tolerance
[MESH]
|Intracellular Signaling Peptides and Proteins/*genetics
[MESH]