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• W2018084087 startingPage "233" @default.
• W2018084087 abstract "Background/Aims: The methylation potential (MP) is defined as the ratio of S-adenosylmethionine (AdoMet) to S-adenosylhomocysteine (AdoHcy). It was shown recently that hypoxia increases AdoMet/AdoHcy ratio in HepG2 cells (Hermes et al., Exp Cell Res 294: 325-334, 2004). In the present study, we compared AdoMet/AdoHcy ratio and energy metabolism in HepG2, HEK-293, HeLa, MCF-7 and SK-HEP-1 cell lines under normoxia and hypoxia. Methods: Metabolite concentrations were measured by HPLC. In addition, AdoHcy hydrolase (AdoHcyase) activity was determined photometrically. Results: Under normoxia HepG2 cells show the highest AdoMet/AdoHcy ratio of 53.4 ± 3.3 followed by MCF-7 and SK-HEP-1 cells with a AdoMet/AdoHcy ratio of 14.4 ± 1.1 and 21.1 ± 1.3, respectively. The lowest AdoMet/AdoHcy ratios are exhibited by HeLa and HEK-293 cells (6.6 ± 0.7 and 7.1 ± 0.3). Hypoxia does not significantly change the MP in MCF-7 and HeLa cells, but alters the MP in HepG2, HEK-293 and SK-HEP-1 cells. These alterations are dependent on the cell density. Under normoxia HepG2 cells exhibit AdoHcyase activity of 2.5 ± 0.2 nmol min-1 mg-1 protein. All other cell lines show 3-5 times lower enzyme activity. Interestingly, hypoxia affects AdoHcyase activity only in HepG2 cells. Conclusions: Our data clearly show that the cell lines are characterized by different MP and different behavior under hypoxia. That implies that a lower MP is not necessarily associated with impaired transmethylation activity and cellular function." @default.
• W2018084087 created "2016-06-24" @default.
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• W2018084087 date "2005-01-01" @default.
• W2018084087 modified "2023-10-17" @default.
• W2018084087 title "S-Adenosylhomocysteine Metabolism in Different Cell Lines: Effect of Hypoxia and Cell Density" @default.
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• W2018084087 doi "https://doi.org/10.1159/000086410" @default.
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