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• W2099391010 abstract "The levels of fucosylated glycoproteins in various cancers and inflammatory processes have been a subject of intense study. The level of fucosyltransferases and intracellular GDP-L-fucose, a sugar nucleotide and a common donor substrate for all fucosyltransferases, may regulate the level of fucosylated glycoproteins. This study reports on the determination of GDP-L-fucose levels in human hepatocellular carcinoma (HCC) and surrounding tissues, using a recently established high-throughput assay system. Levels of GDP-L-fucose in HCC tissues were significantly increased compared with adjacent nontumor tissues or normal livers. The mean +/- SD for GDP-L-fucose level was 3.6 +/- 0.2 micro mol/mg in control liver, 4.6 +/- 0.9 micro mol/mg in adjacent noninvolved liver tissues (chronic hepatitis, 4.4 +/- 0.7 micro mol/mg; liver cirrhosis, 4.8 +/- 0.9 micro mol/mg), and 7.1 +/- 2.5 micro mol/mg in HCC tissues. The level of GDP-L-fucose in HCC decreased in proportion with tumor size (r = -0.675, P = 0.0002). When expression of the series of genes responsible for GDP-L-fucose synthesis was investigated, the gene expression of FX was found to be increased in 70% (7 of 10) of the HCC tissues examined compared with that in their surrounding tissues. The levels of GDP-L-fucose were positively correlated with the expression of FX mRNA (r = 0.599, P = 0.0074). The levels of FX gene expression in some human hepatoma and hepatocyte cell lines were determined. FX mRNA production was strongly increased in HepG2 and Chang liver, moderately increased in Hep3B and HLF, and, in HLE, was similar to that of a normal human liver tissue. To investigate the effect of GDP-L-fucose on core fucosylation, FX cDNA was transfected into Hep3B cells, which express a relatively low level of GDP-L-fucose:N-acetyl-beta-D-glucosaminide alpha1-6 fucosyltransferase (alpha1-6 FucT) and FX mRNA. Transfection of this gene caused an increase in GDP-L-fucose levels as well as the extent of fucosylation on glycoproteins, including alpha-fetoprotein, as judged by reactivity to lectins. Collectively, the results herein suggest that the high level of fucosylation in HCC is dependent on a high expression of FX followed by increases in GDP-L-fucose, as well as an enhancement in alpha1-6 FucT expression. Thus, an elevation in GDP-L-fucose levels and the up-regulation of FX expression represent potential markers for HCC." @default.
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• W2099391010 date "2003-10-01" @default.
• W2099391010 modified "2023-09-29" @default.
• W2099391010 title "Relationship between elevated FX expression and increased production of GDP-L-fucose, a common donor substrate for fucosylation in human hepatocellular carcinoma and hepatoma cell lines." @default.
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