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• W2895353428 abstract "Matrix metalloproteinases (MMPs) are tissue-remodeling enzymes involved in the processing of various biological molecules. MMPs also play important roles in cancer metastasis, contributing to angiogenesis, intravasation of tumor cells, and cell migration and invasion. Accordingly, unraveling the signaling pathways controlling MMP activities could shed additional light on cancer biology. Here, we report a molecular axis, comprising the molecular adaptor hydrogen peroxide-inducible clone-5 (HIC-5), NADPH oxidase 4 (NOX4), and mitochondria-associated reactive oxygen species (mtROS), that regulates MMP9 expression and may be a target to suppress cancer metastasis. We found that this axis primarily downregulates mtROS levels which stabilize MMP9 mRNA. Specifically, HIC-5 suppressed the expression of NOX4, the source of the mtROS, thereby decreasing mtROS levels and, consequently, destabilizing MMP9 mRNA. Interestingly, among six cancer cell lines, only EJ-1 and MDA-MB-231 cells exhibited upregulation of NOX4 and MMP9 expression after shRNA-mediated HIC-5 knockdown. In these two cell lines, activating RAS mutations commonly occur, suggesting that the HIC-5–mediated suppression of NOX4 depends on RAS signaling, a hypothesis that was supported experimentally by the introduction of activated RAS into mammary epithelial cells. Notably, HIC-5 knockdown promoted lung metastasis of MDA-MB-231 cancer cells in mice. The tumor growth of HIC-5–silenced MDA-MB-231 cells at the primary sites was comparable to that of control cells. Consistently, the invasive properties of the cells, but not their proliferation, were enhanced by the HIC-5 knockdown in vitro. We conclude that NOX4-mediated mtROS signaling increases MMP9 mRNA stability and affects cancer invasiveness but not tumor growth." @default.
• W2895353428 created "2018-10-12" @default.
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• W2895353428 date "2018-10-13" @default.
• W2895353428 modified "2023-10-12" @default.
• W2895353428 title "A mitochondrial<scp>ROS</scp>pathway controls matrix metalloproteinase 9 levels and invasive properties in<scp>RAS</scp>‐activated cancer cells" @default.
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• W2895353428 doi "https://doi.org/10.1111/febs.14671" @default.
• W2895353428 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7379617" @default.
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