title: Using isotopic tools to dissect and quantitate parallel metabolic pathways.
abstract: 4-Hydroxyacids are ubiquitous in human physiology. They are derived from the drugs of abuse gamma-hydroxybutyrate (GHB), gamma-hydroxypentanoate(GHP), in addition to the omnipresent lipid peroxidation product 4-hydroxy-2-(E)-nonenal (4-HNE). Previously we reported that 4-hydroxyacids are catabolized through two parallel pathways. In this report we detail two isotopic tools that have allowed the dissection of this catabolic process and illustrate how these tools can be used to quantify the relative flux down each pathway. We found that 4-hydroxynonanoate (4-hydroxyacid derived from 4-HNE) is primarly catabolized through a pathway that phosphorylates the C-4 hydroxyl and isomerizes it to a C-3 hydroxy compound, which is catabolized through beta-oxidation.
authors.affiliation: Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
authors.forename: Sushabhan
authors.initials: S
authors.lastname: Sadhukhan
authors.forename: Yong
authors.initials: Y
authors.lastname: Han
authors.forename: Guo-Fang
authors.initials: GF
authors.lastname: Zhang
authors.forename: Henri
authors.initials: H
authors.lastname: Brunengraber
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Tochtrop
mesh_terms: D000447:Aldehydes / Q000378:metabolism*; D000818:Animals; D005231:Fatty Acids, Unsaturated / Q000378:metabolism; D006880:Hydroxy Acids / Q000378:metabolism; D007554:Isotopes; D008099:Liver / Q000378:metabolism; D053858:Metabolic Networks and Pathways; D051381:Rats
chemical_list: C406867:4-hydroxynonenoic acid; D000447:Aldehydes; D005231:Fatty Acids, Unsaturated; D006880:Hydroxy Acids; D007554:Isotopes; C027576:4-hydroxy-2-nonenal
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