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• W2007677574 abstract "The polyunsaturated fatty acid (PUFA) docosahexaenoic acid (DHA) reduces proliferation of several cell types, including colon tumor cells, and regulates gene expression in a cell- and gene-selective manner. In hepatocytes, the fatty acid synthase (FAS) gene is down-regulated by DHA whereas the carnitine palmitoyltransferase-1 (CPT-1) gene is up-regulated. In adipocytes but not in hepatocytes, the expression of the cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C) gene is stimulated by unsaturated FA, including DHA. We monitored the expression of the FAS, CPT-1 and PEPCK-C genes in rat and human colon and in colonic tumors from humans. The ratio of PEPCK-C to FAS transcripts was in favor of PEPCK-C in human and rat colon, whereas the opposite occurred in Caco2 tumoral cells. FAS gene expression declined from proliferative to differentiated Caco2 cells, while in contrast the expression of PEPCK-C and CPT-1 genes increased. DHA strongly induced expression of the PEPCK-C and CPT-1 genes, in correlation with decreased cell growth, while, as expected, it reduced FAS mRNA. We assessed the relative expression of PEPCK-C, CPT-1 and FAS genes in fragments of colonic tumors and adjacent non-tumoral tissue from a series of 10 patients. PEPCK-C and CPT-1 mRNAs are more abundant in non-tumoral tissues than in the tumoral counterpart, whereas the opposite occurred for the FAS gene. Therefore, the PEPCK-C gene can be defined as a new negative marker for colonic tumors and a target for the anti-tumorigenic action of omega-3 PUFAs." @default.
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• W2007677574 date "2010-12-01" @default.
• W2007677574 modified "2023-10-18" @default.
• W2007677574 title "Down-regulation of the phosphoenolpyruvate carboxykinase gene in human colon tumors and induction by omega-3 fatty acids" @default.
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• W2007677574 doi "https://doi.org/10.1016/j.biochi.2010.07.011" @default.
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