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Inflammation-Driven Carcinogenesis is Mediated through STING [skin]

ABSTRACT: Chronic stimulation of innate immune pathways by microbial agents or damaged tissue is known to promote inflammation-driven tumorigenesis by unclarified mechanisms1-3. Here we demonstrate that mutagenic 7,12-dimethylbenz(a)anthracene (DMBA), etoposide or cisplatin induces nuclear DNA leakage into the cytosol to intrinsically activate STING (Stimulator of Interferon Genes) dependent cytokine production. Inflammatory cytokine levels were subsequently augmented in a STING-dependent extrinsic manner by infiltrating phagocytes purging dying cells. Consequently, STING-/- mice, or wild type mice adoptively transferred with STING-/- bone marrow, were almost completely resistant to DMBA-induced skin carcinogenesis compared to their wild type counterparts. Our data emphasizes, for the first time, a role for STING in the induction of cancer, sheds significant insight into the causes of inflammation-driven carcinogenesis, and may provide therapeutic strategies to help prevent malignant disease

ORGANISM(S): Mus musculus

PROVIDER: GSE57604 | GEO | 2014/05/31

SECONDARY ACCESSION(S): PRJNA246781

REPOSITORIES: GEO

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Project description:7,12-Dimethylbenz[a]anthracene (DMBA)-induced rat mammary carcinoma is a well-recognized model, however, the genetic alterations during its carcinogenesis have yet to be determined. We used laser capture microdissection to specifically isolate cells from terminal end buds (TEBs), the origin of carcinoma, at 2 weeks after sesame oil- treatment (control) or DMBA-treatment (DMBA-TEBs), ductal carcinoma in situ (DCIS) and invasive mammary carcinoma (MC). Using an oligonucleotide microarray representing 20600 rat probe sequences, we analyzed gene expression profiles and validated mRNA and protein levels of genes of interest by real-time quantitative PCR, immunohistochemistry and immunofluorescence. The number of differentially expressed genes was smallest in DMBA-TEBs (63), followed by DCIS (798) and MC (981). Only the expression of PEP-19, an anti-apoptic gene, showed significant increases in DMBA-TEBs (4-fold), DCIS (10-fold) and MC (16-fold). MMP-13 expression was increased markedly in DCIS (19-fold) and MC (61-fold) while OPN expression was increased 6-fold in DCIS and 8-fold in MC. MMP-7 expression was increased 4-fold in MC. Nidogen-1; a participant in the assembly of basement membranes, TSP-2; an inhibitor of angiogenesis and COUP-TFI; a transcription repressor showed significant decreases in DCIS (4-, 9-, and 17-fold, respectively) and MC (10-, 37-, and 100-fold). Network analyses with IPA software revealed that the most significant network was centered on Akt groups in DCIS and ERK groups in MC. The present findings provide insights into the molecular changes and suggest the importance of PEP-19 overexpression very early on during mammary carcinogenesis. Keywords: Comparative experiments of sesame oil treatmentM-oM-<M-^HcontrolM-oM-<M-^Iand 7,12-Dimethylbenz[a]anthraceneM-oM-<M-^HDMBAM-oM-<M-^Itreatment group. Or comparative experiments of tissue type ExperimentM-oM-<M-^Z7,12-Dimethylbenz[a]anthracene (DMBA)-induced rat mammary carcinoma is a well-recognized model, however, the genetic alterations during carcinogenesis have yet to be determined. We used laser capture microdissection to specifically isolate the cells from terminal end buds (TEBs), the origin of MC, at 2 weeks after sesame oil-(control) or DMBA-treatment (DMBA-TEBs), ductal carcinoma in situ (DCIS) and invasive mammary carcinoma (MC). At 50 days after birth, inbred Sprague-Dawley female rats were given 1ml sesame oil (control) or 20 mg DMBA (Nacalai tesque, Inc. Kyoto Japan) dissolved in 1ml sesame oil, by gastric intubations. Animals in control group were euthanized after 2 weeks (W) and DMBA-treated group were euthanized after 2 weeks (W), 6W and 8W, respectively. From for 4 sample(control, DMBA-TEBs, DCIS, MC), we performed a hybridization repeatedly, respectively.

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Inflammation-Driven Carcinogenesis is Mediated through STING [skin]

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