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Wilson, Justin E; Petrucelli, Alex S; Chen, Liang; Koblansky, A Alicia; Truax, Agnieszka D; Oyama, Yoshitaka; Rogers, Arlin B; Brickey, W June; Wang, Yuli; Schneider, Monika; Mühlbauer, Marcus; Chou, Wei-Chun; Barker, Brianne R; Jobin, Christian; Allbritton, Nancy L; Ramsden, Dale A; Davis, Beckley K; Ting, Jenny P Y
Nature medicine, 08/2015, Letnik: 21, Številka: 8Journal Article
The inflammasome activates caspase-1 and the release of interleukin-1β (IL-1β) and IL-18, and several inflammasomes protect against intestinal inflammation and colitis-associated colon cancer (CAC) in animal models. The absent in melanoma 2 (AIM2) inflammasome is activated by double-stranded DNA, and AIM2 expression is reduced in several types of cancer, but the mechanism by which AIM2 restricts tumor growth remains unclear. We found that Aim2-deficient mice had greater tumor load than Asc-deficient mice in the azoxymethane/dextran sodium sulfate (AOM/DSS) model of colorectal cancer. Tumor burden was also higher in Aim2(-/-)/Apc(Min/+) than in APC(Min/+) mice. The effects of AIM2 on CAC were independent of inflammasome activation and IL-1β and were primarily mediated by a non-bone marrow source of AIM2. In resting cells, AIM2 physically interacted with and limited activation of DNA-dependent protein kinase (DNA-PK), a PI3K-related family member that promotes Akt phosphorylation, whereas loss of AIM2 promoted DNA-PK-mediated Akt activation. AIM2 reduced Akt activation and tumor burden in colorectal cancer models, while an Akt inhibitor reduced tumor load in Aim2(-/-) mice. These findings suggest that Akt inhibitors could be used to treat AIM2-deficient human cancers.
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in: SICRIS
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