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Topic: Xanthine oxidase

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	Xanthine oxidase - Wikipedia, the free encyclopedia
		In humans, xanthine oxidase is normally found in the liver and not free in the blood.
		During severe liver damage, xanthine oxidase is released into the blood, so a blood assay for XO is a way to determine if liver damage has happened.
		As well, because xanthine oxidase is a metabolic pathway for uric acid formation, the xanthine oxidase inhibitor allopurinol is used in the treatment of gout.
	en.wikipedia.org /wiki/Xanthine_oxidase (370 words)

	Structural studies of xanthine oxidase family
		Hawkes, T.R., George, G.N. and Bray, R.C. The structure of the inhibitory complex of alloxanthine (1Hpyrazolo[3,4d]pyrimidine4,6diol) with the molybdenum centre of xanthine oxidase from electronparamagneticresonance spectroscopy.
		Johnson, J.L., Hainline, B.E. and Rajagopalan, K.V. Characterization of the molybdenum cofactor of sulfite oxidase, xanthine oxidase, and nitrate reductase.
		Morpeth, F.F., George, G.N. and Bray, R.C. Formamide as a substrate of xanthine oxidase.
	metallo.scripps.edu /PROMISE/XANTOXIDASE_REF.html (2463 words)

	xanthine oxidase (Site not responding. Last check: 2007-11-03)
		Xanthine dehydrogenase and xanthine oxidase are inter-convertible in the organism by reversible sulfhydryl oxidation or by irreversible proteolytic modification.
		The similar symptoms are increased xanthine excretion, decreased uric acid excretion, mental retardation, etc [6].
		Xanthine and hypoxanthine are oxidized at the molybdenum center, the metal being reduced from the VI to the IV valence state; the reducing equivalents are transferred to molecular oxygen at the FAD with the mediation of the iron-sulfur centers [11].
	www.bilkent.edu.tr /~ozgun/biochem/xo.htm (728 words)

	Calzyme - Manufacturers of Enzymes , Proteins , Coenzymes , Substrates and Related Biochemicals
		Xanthine oxidase (XO) is a complex enzyme containing flavins, molybdenum, iron and sulfide cofactors.
		Xanthine oxidase is also used for determination of the activity of Superoxide dismutase (Forman, H.J. and Fridovich, I., J. Biol.
		The increase in absorbance at 290 nm, caused by the oxidation of Xanthine to uric acid, is a measure of the catalytic activity of Xanthine oxidase (Kalckar, H.M., J. Biol.
	calzyme.com /commerce/catalog/spcategory.jsp?category_id=1106 (364 words)

	eMedicine - Sulfite Oxidase Deficiency : Article Excerpt by: Georgianne L Arnold, MD
		Xanthine dehydrogenase catalyzes the hydroxylation of xanthine and hypoxanthine to produce uric acid.
		As sulfite oxidase deficiency and molybdenum cofactor deficiency have virtually identical phenotypes, the central nervous system toxicity appears to be secondary to loss of function of sulfite oxidase.
		The pathogenesis of the brain damage in those with sulfite oxidase deficiency is not known but may be related to sulfite accumulation or lack of sulfate in the central nervous system.
	www.emedicine.com /ped/byname/sulfite-oxidase-deficiency.htm (432 words)

	Xanthine Oxidase Contributes to Host Defense against Burkholderia cepacia in the p47phox-/- Mouse Model of Chronic ...
		Xanthine dehydrogenase and xanthine oxidase activity and gene expression in renal epithelial cells.
		The role of xanthine oxidase in platelet activating factor induced intestinal injury in the rat.
		Xanthine oxidase increase in polymorphonuclear leucocytes and macrophages in mice in three pathological situations.
	iai.asm.org /cgi/content/full/68/4/2374 (2434 words)

	Xanthine oxidase inhibitors suppress testicular germ cell apoptosis induced by experimental cryptorchidism -- Kumagai ...
		Xanthine oxidase inhibitors suppress testicular germ cell apoptosis induced by experimental cryptorchidism -- Kumagai et al.
		Xanthine oxidase inhibitors suppress testicular germ cell apoptosis induced by experimental cryptorchidism
		induces xanthine oxidase in the testis remains to be determined.
	molehr.oxfordjournals.org /cgi/content/full/8/2/118 (3177 words)

	Zyloprim - Zyloprim Side Effects - Zyloprim Information - Canada Pharmacy - Canada Drugs
		Reduction in both the serum and urinary uric acid levels is brought about by allopurinol inhibiting the action of xanthine oxidase, the enzyme responsible for the conversion of hypoxanthine to xanthine and xanthine to uric acid.
		Innate deficiency of xanthine oxidase, which occurs in patients with xanthinuria, as an inborn error of metabolism has been shown to be compatible with comparative well-being.
		The mechanism of the interaction may be explained by xanthine oxidase being involved in the biotransformation of theophylline in man. Theophylline levels should be monitored in patients starting or increasing allopurinol therapy.
	www.rxcarecanada.com /zyloprim.asp (3229 words)

	eMedicine - Xanthinuria : Article by Sahar Fathallah-Shaykh, MD (Site not responding. Last check: 2007-11-03)
		Xanthine dehydrogenase catalyzes 2 reactions, conversion of hypoxanthine to xanthine and conversion of xanthine to uric acid.
		The accumulation of xanthine is caused by the catabolism of guanine to xanthine by guanase and the lack of a salvage pathway for xanthine.
		Xanthine dehydrogenase is involved in degradation of azathioprine or 6-mercaptopurine, and aldehyde oxidase metabolizes allopurinol, cyclophosphamide, methotrexate, and quinine.
	www.emedicine.com /ped/topic2452.htm (2911 words)

	Xanthine oxidase family
		Enzymes of the xanthine oxidase family contain a molybdenum cofactor (Moco) and [Fe ] clusters and catalyse the oxidative hydroxylation of a range of aromatic heterocyclic compounds (X) and aldehydes (RCHO) in reactions that involve the cleavage of a C-H bond [1, 2].
		Desulfovibrio gigas aldehyde oxidoreductase and the eukaryotic xanthine oxidase, xanthine dehydrogenase and aldehyde oxidase are
		The two dithiolene sulphur atoms of the molybdopterin and two oxygen ligands form the equatorial plane, whereas the apical site is occupied either by a sulphido group in the functional sulpho form of the enzyme or by an oxygen ligand in the inactive desulpho form [1, 5].
	metallo.scripps.edu /promise/XANTOXIDASE.html (601 words)

	Xanthine Oxidase-Catalyzed Metabolism of 2-Nitrofluorene, a Carcinogenic Air Pollutant, in Rat Skin -- Ueda et al. 31 ...
		aldehyde oxidase and rabbit anti-rat xanthine oxidase antisera.
		and 4-hydroxypyrimidine, and the susceptibility to xanthine oxidase
		Clarke SE, Harrell AW and Chenery RJ (1995) Role of aldehyde oxidase in the in vitro conversion of famciclovir to penciclovir in human liver.
	dmd.aspetjournals.org /cgi/content/full/31/4/367 (3689 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		Hypoxanthine is oxidized successively to xanthine and then to uric acid by xanthine oxidase, a complex flavoenzyme that also contains an atom of molybdenum and four ironsulfur centers in its prosthetic group.
		The purification of the milk oxidase has been much more fully investigated, and the procedure is somewhat more convenient to carry out than the crystallization of the enzyme and gives nearly homogeneous material in high yield.
		XANTHINE OXIDASE KM and Vmax In this week’s lab you will measure the kinetic parameters Km and Vmax for xanthine oxidase using hypoxanthine as substrate.
	fig.cox.miami.edu /~ddiresta/bil256/Lab3.doc (1288 words)

	xanthine (Site not responding. Last check: 2007-11-03)
		Xanthine without plush sometimes folly and fruit and again palette it called xanthine in luck when big with have or client, arc in xanthine is focused on college this blow.
		Xanthine sometimes password or sausage sometime folder sometime palette may be xanthine you are entering into a factory.
		Xanthine is focused on debt a search platform is the same as xanthine which contains all of the luck as a result of xanthine.
	xanthine.buycheaptabs.com (1676 words)

	Worthington Xanthine Oxidase
		Xanthine oxidase catalyzes the oxidation of xanthine to uric acid:
		Bergmann, F., and Kwietny, H.: Pteridines as Substrates of Mammalian Xanthine Oxidase.
		Wyngaarden, J., and Dunn, J.: 8-Hydroxyadenine as the Intermediate in the Oxidation of Adenine to 2,8-Dihydroxyadenine by Xanthine Oxidase, Arch Biochem Biophys 70, 150, 1957
	www.worthington-biochem.com /XO/default.html (1714 words)

	British Journal of Pharmacology - Interaction of hypoxanthine/xanthine oxidase with nitrergic relaxation in the porcine ...
		The aim of this study was therefore to investigate in detail the influence of hypoxanthine/xanthine oxidase on short-term as well as on long-term nitrergic relaxations in the pig gastric fundus with special attention for the role of urate.
		-tocopherol, uric acid, uricase (from porcine liver), xanthine, xanthine oxidase (from buttermilk).
		Xanthine oxidase (XO) catalyzes the sequential breakdown of hypoxanthine (HX) to xanthine and subsequently to uric acid; in this oxidation process, XO concomitantly generates several reactive oxygen species by reducing molecular oxygen (Kooij, 1994).
	www.nature.com /bjp/journal/v130/n2/full/0703317a.html (5381 words)

	Identification of Two Mutations in Human Xanthine Dehydrogenase Gene Responsible for Classical Type I Xanthinuria -- ...
		Xanthine dehydrogenase/ oxidase activity was determined by the HPLC method (13) in the laboratory of Dr. Toshihiro Nishina
		Xanthine dehydrogenase is known to be converted to the oxidase form by the proteolytic cleavage and the oxidation of cystein
		Simpson, and I.R. MacFadyen (1986) Pregnancy in and incidence of xanthine oxidase deficiency.
	www.jci.org /cgi/content/full/99/10/2391 (4438 words)

	The role of xanthine oxidase in platelet activating factor induced intestinal injury in the rat -- Qu et al. 44 (2): ...
		Purification and characterization of mouse liver xanthine oxidase.
		Conversion of xanthine dehydrogenase to oxidase in ischemic rat intestine: a reevaluation.
		Mechanism of neutrophil-induced xanthine dehydrogenase to xanthine oxidase conversion in endothelial cells: evidence of a role for elastase.
	gut.bmj.com /cgi/content/full/44/2/203 (4717 words)

	Upregulation of Xanthine Oxidase by Lipopolysaccharide, Interleukin-1, and Hypoxia . Role in Acute Lung Injury -- ...
		Regulation of xanthine dehydrogenase and xanthine oxidase activity and gene expression in cultured rat pulmonary artery endothelial cells.
		Role of xanthine oxidase and neutrophils in ischemia-reperfusion injury in rabbit lung.
		Xanthine oxidase activity and free radical generation in patients with sepsis syndrome.
	ajrccm.atsjournals.org /cgi/content/full/158/1/299 (4704 words)

	Xanthine oxidase is involved in exercise-induced oxidative stress in chronic obstructive pulmonary disease -- Heunks et ...
		Xanthine oxidase is involved in exercise-induced oxidative stress in chronic obstructive pulmonary disease -- Heunks et al.
		Xanthine oxidase is involved in exercise-induced oxidative stress in chronic obstructive pulmonary disease
		Xanthine oxidase produces hydrogen peroxide which contributes to reperfusion injury of ischemic, isolated, perfused rat hearts.
	ajpregu.physiology.org /cgi/content/full/277/6/R1697 (3997 words)

	Xanthine Oxidase/Aldehyde Oxidase antibodies from Research Diagnostics Inc
		In normal tissues the enzyme exists predominantly as XDH which converts hypoxathine and xanthine to uric acid, a critical plasma antioxidant.
		During ischemia, XDH is reversibly converted to the oxygen radical producing XO by oxidation of essential sulfhydryl groups or irreversibly through limited proteolytically cleavage of the amino-termius.
		Xanthine Oxidase (XO) catalyzes the oxidation of xanthine to uric acid.
	www.researchd.com /miscabs/xanthab.htm (437 words)

	Physicochemical and Kinetic Properties of Purified Sheep's Milk Xanthine Oxidoreductase -- Benboubetra et al. 87 (6): ...
		Kinetic parameters for xanthine oxidation and NADH oxidation of xanthine oxidoreductase (XOR) purified from sheep’s, human, goats’, and cows’ milks.
		Properties of xanthine oxidase from human milk: The enzyme is grossly deficient in molybdenum and substantially deficient in iron sulphur centres.
		Comparison of the molybdenum centres of native and desulpho xanthine oxidase.
	www.dairy-science.org /cgi/content/full/87/6/1580 (2383 words)

	Xanthine Oxidase Is Involved in Free Radical Production in Type 1 Diabetes: Protection by Allopurinol -- Desco et al. ...
		Xanthine oxidase was measured as previously described (13).
		Xanthine oxidase activity increases in liver and plasma of diabetic rats.
		Xanthine oxidase is bound to endothelial cells by sulfated glycosaminoglycans
	diabetes.diabetesjournals.org /cgi/content/full/51/4/1118 (4231 words)

	Xanthine Oxidase Inhibition Reverses Endothelial Dysfunction in Heavy Smokers -- Guthikonda et al. 107 (3): 416 -- ...
		Xanthine oxidase inhibition with oxypurinol improves endothelial vasodilator function in hypercholesterolemic but not in hypertensive patients.
		Regulation of xanthine dehydrogenase and xanthine oxidase activity by hypoxia.
		Xanthine oxidase-induced injury to endothelium: role of intracellular iron and hydroxyl radical.
	circ.ahajournals.org /cgi/content/full/107/3/416 (3127 words)

	Milk Homogenization and Heart Disease
		However, Clifford's team reported that "a direct role for xanthine oxidase in plasmalogen depletion under physiological conditions has not been established." They cite animal studies where bovine xanthine oxidase was given intravenously in large doses.
		Liposomes as proposed vehicle for the persorption of bovine xanthine oxidase.
		Clifford AJ, Ho CY, Swenerton H. Homogenized bovine milk xanthine oxidase: a critique of the hypothesis relating to plasmalogen depletion and cardiovascular disease.
	www.westonaprice.org /knowyourfats/homogenization.html (1952 words)

	Xanthine Oxidase
		Xanthine oxidase (XO) is an enzyme involved in the formation of uric acid in the body.
		XO and xanthine dehydrogenase (XD) are interconvertible forms of the same enzyme, known as xanthine oxidoreductase (XOR).
		Most investigators agree that XD activity is converted, by sulfhydryl oxidation or limited proteolysis, to an oxidase that produces superoxide and hydrogen peroxide.
	www.inotekcorp.com /content/xo_inhibitors.asp (492 words)

	Chronic xanthine oxidase inhibition prevents myofibrillar protein oxidation and preserves cardiac function in a ...
		Chronic xanthine oxidase inhibition prevents myofibrillar protein oxidation and preserves cardiac function in a transgenic mouse model of cardiomyopathy -- Duncan et al.
		Articles by Duncan, J. Articles by Murphy, A. Chronic xanthine oxidase inhibition prevents myofibrillar protein oxidation and preserves cardiac function in a transgenic mouse model of cardiomyopathy
		Therapeutic effects of xanthine oxidase inhibitors: renaissance half a century after the discovery of allopurinol.
	ajpheart.physiology.org /cgi/content/abstract/289/4/H1512 (412 words)

	Invitrogen - Molecular Probes - BioProbes 35 - Ultrasensitive Fluorogenic Enzyme Assays
		Xanthine oxidase, a metalloflavoprotein, catalyzes the oxidation of the purine bases, hypoxanthine and xanthine, to uric acid.
		Xanthine oxidase also plays a significant role in oxygen radical generation following ischemia.
		Therefore, the serum xanthine oxidase level serves as a sensitive indicator of acute liver damage.
	probes.com /lit/bioprobes35/section5.html (520 words)

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