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- W2114927169 abstract "The role of hepatic de novo lipogenesis (DNL) in promoting fatty liver disease and hypertriglyceridemia during excessive nutrient intake is becoming firmly established. Certain nutrients such as fructose promote hepatic DNL activity and this has been at least partly attributed to their efficient conversion to the acetyl-CoA precursors of DNL. However, tracer studies indicate a paradoxically low level of fructose incorporation into lipids, which begs the question of what the actual lipogenic acetyl-CoA sources are under these and other conditions. Here, we describe novel approaches for measuring substrate contributions to lipogenic hepatic acetyl-CoA using 13 C-tracers and 13 C-NMR analysis of lipids and acetyl-CoA probes. We review and address aspects of hepatic intermediary fluxes and acetyl-CoA compartmentation that can confound the relationship between 13 C-precursor substrate and lipogenic 13 C-acetyl-CoA enrichments and demonstrate novel methodologies that can provide realistic estimates of 13 C-enriched substrate contributions to DNL. The most striking realization is that the principal substrate contributors to lipogenic acetyl-CoA have yet to be identified, but they are probably not the so-called “lipogenic substrates” such as fructose. The proposed methods may improve our insight into the nutrient sources of DNL under various feeding and disease states." @default.
- W2114927169 created "2016-06-24" @default.
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- W2114927169 date "2014-08-11" @default.
- W2114927169 modified "2023-10-16" @default.
- W2114927169 title "Identifying Sources of Hepatic Lipogenic Acetyl-CoA Using Stable Isotope Tracers and NMR" @default.
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- W2114927169 doi "https://doi.org/10.1155/2014/109252" @default.
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