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- W2182256406 abstract "Uridine diphosphate (UDP) galactose, a pivotal compound in the metabolism of galactose, is the obligate donor of galactose in the formation of complex glycoconjugates. The cellular UDPgalactose concentration has been thought to be maintained by the interconversion of UDPglucose and UDPgalactose by UDPgalactose-4-epimerase. However, recent findings of lower average red blood cell (RBC) UDPgalactose concentrations in galactose-1-phosphate uridyltransferase-deficient patients suggest that other factors play a role in determining its concentration. To test the hypothesis that the amount of galactose traversing the Leloir pathway contributes to the cellular UDPgalactose pool, we determined RBC UDPgalactose in patients with maple syrup urine disease (MSUD), phenylketonuria (PKU), and other metabolic diseases who were treated with a low-protein, and consequently, low-lactose diet. Six patients with MSUD were also supplemented with 19 g galactose/d and their UDPhexose concentrations were measured at intervals. We show that young patients with MSUD or PKU have decreased average RBC UDPgalactose concentrations when compared with similarly aged healthy subjects. Galactose supplementation of MSUD patients significantly increased their UDPgalactose concentrations in both RBCs and white blood cells (WBCs) from 29.5 +/- 1.5 to 42.3 +/- 5.8 nmol/g hemoglobin and from 69.0 +/- 7.5 to 193.0 +/- 49.0 nmol/g protein, respectively. Discontinuation of supplementation was associated with a return to basal values in RBCs and a reattainment of the pretreatment ratio of UDPglucose to UDPgalactose in WBCs. These observations demonstrate that dietary galactose is a factor in establishing the steady state concentrations of the uridine sugar nucleotides and imply that galactose metabolism modulates the achievement of an epimerase-mediated equilibrium." @default.
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- W2182256406 title "Sugar nucleotide concentrations in red blood cells of patients on protein- and lactose-limited diets: effect of galactose supplementation" @default.
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- W2182256406 doi "https://doi.org/10.1093/ajcn/63.5.704" @default.
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