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Constance Schmelzer,Christine Kohl,Gerald Rimbach,Frank Döring 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.4
Monocytes are key players in inflammatory processes that are triggered by lipopolysaccharide (LPS), the major outer membrane component of Gram-negative bacteria. The present study in human monocytic THP-1 cells was designed in order to identify LPS-inducible genes that are down-regulated by the reduced form of coenzyme Q_10 (ubiquinol, Q_10H_2). For this purpose, THP-1 cells were incubated with 10 μM Q_10H_2 for 24 hours. Subsequently, cells were stimulated for 4 hours with 1 μg/mL LPS, and the resulting gene expression levels were determined using microarrays. Fourteen LPS-inducible genes were identified to be significantly (P ≤ .05) down-regulated by Q_10H_2 pretreatment between a factor of 1.32 and 1.65. The strongest effect of Q_10H_2 incubation was found for the nuclear receptor coactivator 2 gene (NCOA2). Gene ontology terms revealed for the Q10H2-sensitive genes an involvement in, e.g., signal transduction processes (centaurin, delta 1; NCOA2; pleckstrin and Sec7 domain containing 3; protein phosphatase 2, regulatory subunit B [B56], γ isoform), transcriptional regulation (NCOA2; POU domain, class 2, transcription factor 1; ETS variant gene 3), and cell proliferation pathways (hypothetical protein FLJ36090, epidermal growth factor receptor pathway substrate 15). In conclusion, we provide evidence in THP-1 cells that Q_10H_2 modulates LPS-induced gene expression.