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• W2014337196 abstract "N‑3‑oxododecanoyl homoserine lactone (3‑oxo‑C12‑HSL), a quorum‑sensing signal molecule produced by Pseudomonas aeruginosa (P. aeruginosa), is involved in the expression of bacterial virulence factors and in the modulation of host immune responses by directly disrupting nuclear factor‑κB (NF‑κB) signaling and inducing cell apoptosis. The unfolded protein response (UPR) triggered by endoplasmic reticulum (ER) stress may suppress inflammatory responses in the later phase by blocking NF‑κB activation. It was recently demonstrated that 3‑oxo‑C12‑HSL may induce UPR in human aortic endothelial cells (HAECs). Therefore, 3‑oxo‑C12‑HSL may also inhibit NF‑κB activation and suppress inflammatory responses by activating UPR. However, the possible underlying mechanism has not been fully elucidated. Accordingly, we investigated the effects of 3‑oxo‑C12‑HSL on cellular viability, UPR activation, lipopolysaccharide (LPS)‑induced NF‑κB activation and inflammatory response in the RAW264.7 mouse macrophage cell line. Treatment with 6.25 µM 3‑oxo‑C12‑HSL was not found to affect the viability of RAW264.7 cells. However, pretreating RAW264.7 cells with 6.25 µM 3‑oxo‑C12‑HSL effectively triggered UPR and increased the expression of UPR target genes, such as CCAAT/enhancer‑binding protein β (C/EBP β) and CCAAT/enhancer‑binding protein‑homologous protein (CHOP). The expression of C/EBP β and CHOP was found to be inversely correlated with LPS‑induced NF‑κB activation. 3‑Oxo‑C12‑HSL pretreatment was also shown to inhibit LPS‑stimulated proinflammatory cytokine production. Hence, 3‑oxo‑C12‑HSL may attenuate LPS‑induced inflammation via UPR‑mediated NF‑κB inhibition without affecting cell viability. This may be another mechanism through which P. aeruginosa evades the host immune system and maintains a persistent infection." @default.
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• W2014337196 date "2014-01-17" @default.
• W2014337196 modified "2023-10-14" @default.
• W2014337196 title "Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl) homoserine lactone attenuates lipopolysaccharide-induced inflammation by activating the unfolded protein response" @default.
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• W2014337196 doi "https://doi.org/10.3892/br.2014.225" @default.
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