Search results for "Retinol oxidation"

showing 3 items of 3 documents

Retinol oxidation to retinoic acid in human thyroid glandular cells.

2014

Abstract Retinoic acid is regarded as the retinol metabolite that controls proliferation and differentiation of epithelial cells. In the present study, we investigated the potential role of xanthine dehydrogenase (XDH) in retinoic acid biosynthesis in human thyroid glandular cells (HTGC). In particular, we observed that cellular retinoids binding proteins (CRBPs) are also implicated in the biosynthetic pathway leading to retinoic acid formation in primary cultures of HTGC, as we have already reported for human mammary epithelial cells (HMEC). After partial protein purification, the enzyme responsible for retinoic acid biosynthesis was identified and quantified as XDH by immunoassay, by its …

AdultMaleXanthine DehydrogenasePrimary Cell CultureRetinoic acidThyroid GlandOxypurinolRetinoic acid receptor betaTretinoinBiologyXanthinechemistry.chemical_compoundBiosynthesisSettore BIO/10 - BiochimicaDrug DiscoveryHumansEnzyme InhibitorsVitamin AEnzyme AssaysPharmacologyImmunoassayRetinolEpithelial CellsRetinol-Binding Proteins CellularGeneral MedicineMiddle AgedXanthineUric AcidRetinoic acid receptorchemistryXanthine dehydrogenaseBiochemistryCRABPs CRBPs human glandular cells. retinoic acid biosynthesis. retinol oxidation xanthine dehydrogenaseUric acidFemaleOxidation-ReductionJournal of enzyme inhibition and medicinal chemistry
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Xanthine dehydrogenase processes retinol to retinoic acid in human mammary epithelial cells

2008

Retinoic acid is considered to be the active metabolite of retinol, able to control differentiation and proliferation of epithelia. Retinoic acid biosynthesis has been widely described with the implication of multiple enzymatic activities. However, our understanding of the cell biological function and regulation of this process is limited. In a recent study we evidenced that milk xanthine oxidase (E.C. 1.17.3.2.) is capable to oxidize all-trans-retinol bound to CRBP (holo-CRBP) to all-trans-retinaldehyde and then to all-trans-retinoic acid. To get further knowledge regarding this process we have evaluated the biosynthetic pathway of retinoic acid in a human mammary epithelial cell line (HME…

Receptors Retinoic AcidXanthine dehydrogenaseCellRetinoic acidOxypurinolTretinoinRetinoic acid receptor betaBiologychemistry.chemical_compoundSettore BIO/10 - BiochimicaDrug DiscoverymedicineHumansMammary Glands HumanVitamin AXanthine oxidaseHMECPharmacologyRetinolEpithelial CellsRetinol-Binding Proteins CellularGeneral MedicineMilk ProteinsNADRetinoic acid receptormedicine.anatomical_structurechemistryBiochemistryXanthine dehydrogenaseRetinol oxidationRetinoic acid receptor alphaRetinoid AcidMetabolic Networks and PathwaysJournal of Enzyme Inhibition and Medicinal Chemistry
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Xanthine oxidase catalyzes the oxidation of retinol.

2007

In mammals, xanthine oxidase (E.C. 1.17.3.2) catalyzes the hydroxylation of a wide variety of heterocyclic substrates such as purines, pyrimidines, and pterins, in addition to aldehydes [1] as all-trans-retinaldehyde [2-5]. Here, we show that buttermilk xanthine oxidase was capable to oxidizing all-trans-retinol (t-ROL) to all-trans-retinaldehyde (t-RAL) that was successively oxidized to all-trans-retinoic acid (t-RA). A rise in the enzyme activity, when t-ROL-CRBP complex was assayed, with respect to the free t-ROL, was observed. Furthermore, treatment of the enzyme with Na2S and glutathione resulted in a significant increment in catalytic activity toward t-ROL and t-RAL, due to the recons…

Xanthine OxidaseReceptors Retinoic Acidchemistry.chemical_elementTretinoinHydroxylationLigandsCatalysisHydroxylationchemistry.chemical_compoundRetinoidsDrug DiscoveryHumansXanthine oxidasePurine metabolismVitamin APharmacologychemistry.chemical_classificationHypoxanthinebiologyEthanolRetinol-Binding Proteins CellularGeneral MedicineGlutathioneEnzyme assayOxygenRetinol-Binding ProteinsKineticsEnzymechemistryBiochemistryXanthine dehydrogenaseMolybdenumbiology.proteinXanthine oxidase retinol oxidation retinaldehyde oxidation retinoic acid biosynthesis cellular retinoid binding protein (CRBP) Cellular retinoic acid binding protein (CRABP) retinol binding protein (RBP)Journal of enzyme inhibition and medicinal chemistry
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