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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 Cancer+Immunol+Res
2014 ; 2
(12
): 1199-208
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STING contributes to antiglioma immunity via triggering type I IFN signals in the
tumor microenvironment
#MMPMID25300859
Ohkuri T
; Ghosh A
; Kosaka A
; Zhu J
; Ikeura M
; David M
; Watkins SC
; Sarkar SN
; Okada H
Cancer Immunol Res
2014[Dec]; 2
(12
): 1199-208
PMID25300859
show ga
Although type I IFNs play critical roles in antiviral and antitumor activity, it
remains to be elucidated how type I IFNs are produced in sterile conditions of
the tumor microenvironment and directly affect tumor-infiltrating immune cells.
Mouse de novo gliomas show increased expression of type I IFN messages, and in
mice, CD11b(+) brain-infiltrating leukocytes (BIL) are the main source of type I
IFNs that are induced partially in a STING (stimulator of IFN genes)-dependent
manner. Consequently, glioma-bearing Sting(Gt) (/Gt) mice showed shorter survival
and lower expression levels of Ifns compared with wild-type mice. Furthermore,
BILs of Sting(Gt) (/Gt) mice showed increased CD11b(+) Gr-1(+) immature myeloid
suppressor and CD25(+) Foxp3(+) regulatory T cells (Treg) and decreased
IFN?-producing CD8(+) T cells. CD4(+) and CD8(+) T cells that received direct
type I IFN signals showed lesser degrees of regulatory activity and increased
levels of antitumor activity, respectively. Finally, intratumoral administration
of a STING agonist (cyclic diguanylate monophosphate; c-di-GMP) improved the
survival of glioma-bearing mice associated with enhanced type I IFN signaling,
Cxcl10 and Ccl5, and T-cell migration into the brain. In combination with
subcutaneous OVA peptide vaccination, c-di-GMP increased OVA-specific
cytotoxicity of BILs and prolonged their survival. These data demonstrate
significant contributions of STING to antitumor immunity via enhancement of type
I IFN signaling in the tumor microenvironment and suggest a potential use of
STING agonists for the development of effective immunotherapy, such as the
combination with antigen-specific vaccinations.