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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2013 ; 190
(11
): 5894-902
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Increased Th17 cells in the tumor microenvironment is mediated by IL-23 via
tumor-secreted prostaglandin E2
#MMPMID23645882
Qian X
; Gu L
; Ning H
; Zhang Y
; Hsueh EC
; Fu M
; Hu X
; Wei L
; Hoft DF
; Liu J
J Immunol
2013[Jun]; 190
(11
): 5894-902
PMID23645882
show ga
Tumor cell-derived molecules such as cytokines and lipid mediators play a
critical role in inducing chronic inflammation in the tumor microenvironment. We
found that Th17 cells were increased in the peripheral blood, spleen, and tumor
tissues of mammary gland tumor-bearing mice. The Th17 cell survival factor,
IL-23, was also overexpressed in tumor tissues isolated from mice and human
breast cancer patients. Soluble molecules secreted from breast tumor cells, but
not normal breast epithelial cells, induced IL-23 protein secretion in dendritic
cells via induction of p19 mRNA expression. Our data further indicate that
tumor-secreted PGE2 through EP2 and EP4 receptors enhanced IL-23 p19 gene
transcription through binding to the cAMP-response element in the p19 promoter.
Blocking PGE2 synthesis by NS398, a COX2 inhibitor, abrogated the enhancement of
p19 expression both in vitro and in vivo. Furthermore, blocking protein kinase A
(PKA) by H89 completely abrogated the inductive effects of tumor-conditioned
medium and PGE2 on p19 transcription, whereas the cAMP active analog, Forskolin,
mimics the PGE2 effect. Taken together, our results indicate that tumor-secreted
PGE2 induces IL-23, but not IL-12, production in the tumor microenvironment,
leading to Th17 cell expansion. This inductive effect of PGE2 on IL-23 p19
transcription is mediated through cAMP/PKA signaling transduction pathway.
|Animals
[MESH]
|Breast Neoplasms/immunology/metabolism
[MESH]
|Cell Line
[MESH]
|Cyclic AMP-Dependent Protein Kinases/metabolism
[MESH]