0000000000617925

AUTHOR

Kwok Ki Ho

showing 2 related works from this author

Oxidative Inhibition of the Mitochondrial Aldehyde Dehydrogenase Promotes Nitroglycerin Tolerance in Human Blood Vessels

2007

Objectives We tested the hypothesis of whether an inhibition of the nitroglycerin (GTN) bioactivating enzyme mitochondrial aldehyde dehydrogenase (ALDH-2) contributes to GTN tolerance in human blood vessels. Background The hemodynamic effects of GTN are rapidly blunted by the development of tolerance, a phenomenon associated with increased formation of reactive oxygen species (ROS). Recent studies suggest that ROS-induced inhibition of ALDH-2 accounts for tolerance in animal models. Methods Segments of surgically removed arteria mammaria and vena saphena from patients undergoing coronary bypass surgery were used to examine the vascular responsiveness to GTN and the endothelium-dependent vas…

Malemedicine.medical_specialtyNitric Oxide Synthase Type IIIVasodilator AgentsMyocardial InfarctionAldehyde dehydrogenaseVasodilationPharmacologyDrug Administration ScheduleTissue Culture TechniquesNitroglycerinIn vivoEnosmedicineHumansSaphenous VeinEndothelial dysfunctionMammary ArteriesAgedbiologybusiness.industryAldehyde Dehydrogenase MitochondrialDrug ToleranceAldehyde Dehydrogenasemedicine.diseasebiology.organism_classificationAcetylcholineSurgeryOxidative Stressmedicine.anatomical_structureCirculatory systemcardiovascular systembiology.proteinFemaleAnimal studiesbusinessCardiology and Cardiovascular Medicinecirculatory and respiratory physiologyBlood vesselJournal of the American College of Cardiology
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Role of Reduced Lipoic Acid in the Redox Regulation of Mitochondrial Aldehyde Dehydrogenase (ALDH-2) Activity

2007

Chronic therapy with nitroglycerin results in a rapid development of nitrate tolerance, which is associated with an increased production of reactive oxygen species. We have recently shown that mitochondria are an important source of nitroglycerin-induced oxidants and that the nitroglycerin-bioactivating mitochondrial aldehyde dehydrogenase is oxidatively inactivated in the setting of tolerance. Here we investigated the effect of various oxidants on aldehyde dehydrogenase activity and its restoration by dihydrolipoic acid. In vivo tolerance in Wistar rats was induced by infusion of nitroglycerin (6.6 microg/kg/min, 4 days). Vascular reactivity was measured by isometric tension studies of iso…

biologyChemistryAldehyde dehydrogenaseDehydrogenaseCell BiologyOxidative phosphorylationMitochondrionBiochemistrychemistry.chemical_compoundLipoic acidBiochemistryDihydrolipoic acidcardiovascular systembiology.proteinBranched-chain alpha-keto acid dehydrogenase complexMolecular BiologyPeroxynitriteJournal of Biological Chemistry
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