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Topic: Myeloperoxidase

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Myeloperoxidase deficiency

In the News (Thu 31 Dec 09)

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	2001 UW AMC Dean's Report (Site not responding. Last check: 2007-11-06)
		Myeloperoxidase, to a considerable degree, is responsible for killing a number of invading bacteria and other infectious organisms.
		Myeloperoxidase, a key ingredient of the granules present in neutrophils, is released along with an arsenal of other toxic agents into the phagosome containing the ingested bacteria.
		At that point the myeloperoxidase interacts with the hydrogen peroxide and chloride in the phagosome to produce hypochlorous acid, which is lethal to the invading bacteria.
	depts.washington.edu /drrpt/2001/research/neutrophils.html (566 words)

	THE VALUE OF CD34, MYELOPEROXIDASE AND CHLORACETATE ESTERASE (LEDER) STAIN IN THE DIAGNOSIS OF GRANULOCYTIC SARCOMA (Site not responding. Last check: 2007-11-06)
		Myeloperoxidase was expressed in 10 of the 15 cases (66%), and Leder stain was positive in 9 cases (60%).
		Myeloperoxidase was present in 10 cases (66%), with expression similar to that seen with CD34 (Figure 3).
		Myeloperoxidase is considered the most sensitive marker for the detection of granulocytic sarcoma.
	www.kfshrc.edu.sa /annals/215_216/01-084R.htm (2401 words)

	Myeloperoxidase is the most promising cardiac marker at the moment (Site not responding. Last check: 2007-11-06)
		Myeloperoxidase is a lysosomal enzyme that is found in white blood cells, neutrophils.
		Myeloperoxidase is an enzyme that uses hydrogen peroxidase to convert chloride to hypochlorous acid.
		By measuring the myeloperoxidase level in blood it is possible to predict whether a person is in risk of heart attack or death in the following six months.
	www.hytest.fi /high_lights15.php (181 words)

	Université Libre de Bruxelles - page 1/5
		Myeloperoxidase could not initiate arthritis, however myeloperoxidase injected after swelling and erythema has returned to the baseline, could induce a dose-dependant exacerbation of periarticular swelling and production of TNFa (in collaboration with Dr D. Lefkowitz, USA).
		Again, we have made the hypothesis that myeloperoxidase released from the neutrophils could interact with monocytes/macrophages and with the cells constituting the arteries wall, leading to their activation and to the production of reactive oxygen species and cytokines.
		The extracorporeal specific immuno-adsorption of autoantibodies on recombinant myeloperoxidase could lead to a remission of the disease by suppressing the factor, which maintains the disease and validate the general concept of the treatment.
	www.ulb.ac.be /preview1/ibmm/genetique-appliquee_5.html (867 words)

	Chlorine Online - Chlorine - Science - Natural Chemistry of Chlorine (Site not responding. Last check: 2007-11-06)
		We have shown enzymatically-active myeloperoxidase is present in human atherosclerotic tissue, where it co-localizes with white blood cells.
		Myeloperoxidase is the only human enzyme known to generate HOCl at plasma concentrations of halide ion.
		To investigate the role of myeloperoxidase in promoting LDL oxidation in vivo, we used isotope dilution gas chromatography/mass spectrometry to quantify the level of 3-chlorotyrosine in atherosclerotic lesions.
	www.eurochlor.org /chlorine/science/chemistryHeart.htm (678 words)

	Biochemical and Molecular Characterization of Hereditary Myeloperoxidase Deficiency -- Romano et al. 90 (10): 4126 -- ...
		Hereditary myeloperoxidase (MPO) deficiency is a neutrophil disorder characterized by the lack of peroxidase activity.
		MYELOPEROXIDASE (MPO; E.C. 1.11.1.7) is a heme-enzyme synthesized in neutrophil granulocyte precursors and in monocytes.
		Lehrer RI, Cline MJ: Leukocyte myeloperoxidase deficiency and disseminated candidiasis: The role of myeloperoxidase in resistance to Candida infection.
	www.bloodjournal.org /cgi/content/full/90/10/4126 (4998 words)

	Severe Impairment in Early Host Defense against Candida albicans in Mice Deficient in Myeloperoxidase -- Aratani et al. ...
		Myeloperoxidase (MPO; EC 1.11.1.7) is a cationic heme-containing
		Leukocyte myeloperoxidase deficiency and disseminated candidiasis: the role of myeloperoxidase in resistance to Candida infection.
		Biochemical and molecular characterization of hereditary myeloperoxidase deficiency.
	iai.asm.org /cgi/content/full/67/4/1828 (5604 words)

	International Conference 2000 (Site not responding. Last check: 2007-11-06)
		Myeloperoxidase (donor: hydrogen peroxide oxidoreductase, EC 1.11.1.7) is stored in large amounts in azurophilic granules of polymorphonuclear leukocytes.
		Myeloperoxidase is able to produce hypochlorous acid (and other (pseudo)hypohalous acids), to oxidise directly and also to hydrolyse different substrates.
		The aim of this study is to present a thermodynamic model for myeloperoxidase reactions under special consideration of reactions of compound I of the enzyme in order to understand better the factors influencing the production of hypochlorous acid.
	www.boku.ac.at /pod2000/arnholda.html (362 words)

	Free Radical Research
		Myeloperoxidase is the most abundant protein in neutrophils.
		We have shown that superoxide is required as a cofactor for the catalase activity of myeloperoxidase.
		Using these biomarkers we have shown that hypochlorous acid and hypobromous acid are produced in the lungs of premature infants, asthmatics, and infants with cystic fibrosis.
	www.chmeds.ac.nz /research/freerad/tkeetle.htm (310 words)

	News - Baseline Plasma Myeloperoxidase Level Can Identify Risk for Imminent Major Cardiac Event
		Myeloperoxidase levels at baseline predicted cardiovascular risk independently of C-reactive protein levels and other markers of inflammation, even if serial troponin T levels rule out myocardial infarction, report Stanley L. Hazen, MD, PhD, and colleagues at the Cleveland Clinic Foundation, Ohio, United States.
		Myeloperoxidase levels were measured in 604 sequential patients who presented to the emergency department within 24 hours of chest pain onset.
		Myeloperoxidase levels were compared against those of 115 healthy adults with no history or clinical evidence of coronary artery disease.
	www.docguide.com /news/content.nsf/news/8525697700573E1885256DC9002DFA09 (589 words)

	Bellometti S, Galzigna L (Site not responding. Last check: 2007-11-06)
		Neutrophils also play an important role in inflammatory reactions and the level of myeloperoxidase, a constituent of neutrophil granules, is related to the intensity of the inflammation.
		Because there is evidence that suggests that mud packs influence the main cytokines involved in cartilage damage, we tried to determine whether NO and myeloperoxidase are involved in the mechanisms of action of mud bath treatment.
		The results showed a statistically significant decrease in NO and myeloperoxidase serum values in groups A and B, while GSH-peroxidase was not significantly increase in either of the groups; no correlation was found between NO, myeloperoxidase and GSH-peroxidase serum values.
	perso.wanadoo.fr /rhumato/biblio/biblio70.htm (288 words)

	Single Nucleotide Polymorphisms in Myeloperoxidase and Catalase Genes Increase Susceptibility for Arsenic-Induced ...
		Continuing on previous research in Bangladesh by this team of investigators, this report focuses on whether single nucleotide polymorphisms in two oxidative stress genes are associated with increased risk of arsenic-induced hyperkeratotic skin lesions (precursors of skin cancer) in a case-control study also carried out in Bangladesh.
		When combined with high arsenic exposure, carriers of the susceptible myeloperoxidase gene had six times the risk of hyperkeratosis than did subjects with low arsenic exposure and the low-risk genotype.
		Susceptibility to arsenic-induced hyperkeratosis and oxidative stress genes myeloperoxidase and catalase.
	www.niehs.nih.gov /dert/profiles/hilites/2003/hyperker.htm (382 words)

	Immunohistochemical Detection of Myeloperoxidase and Its Oxidation Products in Kupffer Cells of Human Liver -- Brown et ...
		Purified myeloperoxidase (250 ng) and detergent extracts of liver homogenates (15 µg protein) were separated in 1% sodium dodecyl sulfate on a 10 to 20% polyacrylamide gradient gel and transblotted onto a polyvinylidene difluoride membrane.
		confocal microscopy with the rabbit antibody to myeloperoxidase
		Large numbers of cells expressing myeloperoxidase and CD68 are observed in the septa of cirrhotic livers and are associated with the presence of hypochlorous acid-modified proteins in periseptal hepatocytes.
	ajp.amjpathol.org /cgi/content/full/159/6/2081 (3979 words)

	Statins Promote Potent Systemic Antioxidant Effects Through Specific Inflammatory Pathways -- Shishehbor et al. 108 ... (Site not responding. Last check: 2007-11-06)
		Tyrosyl radical generated by myeloperoxidase is a physiological catalyst for the initiation of lipid peroxidation in low density lipoprotein.
		Macrophage myeloperoxidase regulation by granulocyte macrophage colony-stimulating factor in human atherosclerosis and implications in acute coronary syndromes.
		Myeloperoxidase, a catalyst for lipoprotein oxidation, is expressed in human atherosclerotic lesions.
	circ.ahajournals.org /cgi/content/full/108/4/426 (3271 words)

	BLEACH-PRODUCING ENZYME FOUND (Site not responding. Last check: 2007-11-06)
		The bleach-producing enzyme, known as myeloperoxidase, is a green-colored protein found in abundant supply in white blood cells, one of the sentries of the immune system.
		"Myeloperoxidase has been known to be an important component of the immune system," said Jason P. Eiserich, lead author and assistant professor of medicine and human physiology at the UC Davis School of Medicine and Medical Center.
		The research team found that following the induction of acute inflammation in rodent models, myeloperoxidase is released from activated white blood cells, permeates vascular cells and is deposited within the blood vessel wall where it acts to consume nitric oxide, thereby blocking the signal that dilates blood vessels.
	www.ucdmc.ucdavis.edu /news/bleach_enzyme.html (558 words)

	Novel products generated from 2'-deoxyguanosine by hypochlorous acid or a myeloperoxidase-H2O2-Cl- system: ...
		An aliquot of 1 mM dGuo was incubated with 50 nM myeloperoxidase,
		An aliquot of 1 mM dGuo was incubated with 50 nM myeloperoxidase in the presence of H
		Furtmüller,P.G., Burner,U. and Obinger,C. (1998) Reaction of myeloperoxidase compound I with chloride, bromide, iodide and thiocyanate.
	nar.oupjournals.org /cgi/content/full/30/11/2555 (5867 words)

	Mass spectrometric quantification of amino acid oxidation products in proteins: insights into pathways that promote LDL ...
		Myeloperoxidase secreted by phagocytes uses the peroxide to generate an array of oxidizing intermediates.
		Myeloperoxidase generated tyrosyl radical may promote LDL oxidation by forming o,o'-dityrosine cross-links in proteins and initiating lipid peroxidation.
		Myeloperoxidase also generates other intermediates (such as amino acid-derived aldehydes and reactive nitrogen species) that may play a role in converting LDL into an atherogenic particle.
	www.fasebj.org /cgi/content/full/13/10/1113 (4477 words)

	Purification and quantification of lactoperoxidase in human milk with use of immunoadsorbents with antibodies against ...
		myeloperoxidase activity during this period ( 5, 12).
		The amounts used were 10 µL in the case of the saliva and whey samples and 10 ng in the case of the purified proteins.
		Values represent means of quadruplicate assays in the case of recombinant and native human lactoperoxidase and means of duplicate assays in the case of bovine lactoperoxidase and human myeloperoxidase.
	www.ajcn.org /cgi/content/full/73/5/984 (3316 words)

	3-Chlorotyrosine as a Marker of Protein Damage by Myeloperoxidase in Tracheal Aspirates From Preterm Infants: ... (Site not responding. Last check: 2007-11-06)
		3-Chlorotyrosine as a Marker of Protein Damage by Myeloperoxidase in Tracheal Aspirates From Preterm Infants: Association With Adverse Respiratory Outcome -- BUSS et al.
		Wispe JR, Bell EF, Roberts RJ 1985 Assessment of lipid peroxidation in newborn infants and rabbits by measurements of expired ethane and pentane: influence of parenteral lipid infusion.
		Myeloperoxidase and Protein Oxidation in the Airways of Young Children with Cystic Fibrosis
	www.pedresearch.org /cgi/content/full/53/3/455 (4383 words)

	OMIM Entry 254600 (Site not responding. Last check: 2007-11-06)
		Myeloperoxidase (EC 1.11.1.7) is a lysosomal hemoprotein located in the azurophilic granules of polymorphonuclear (PMN) leukocytes and monocytes.
		The incidence of candidiasis may be increased in persons with myeloperoxidase deficiency, and the ability of the leukocytes of affected persons to resist Candida in vitro may be reduced.
		Lehrer, R. I.; Cline, M. Leukocyte myeloperoxidase deficiencyand disseminated candidiasis: the role of myeloperoxidase in resistanceto Candida infection.
	www.hgmp.mrc.ac.uk /cgi-bin/wrapomim?254600 (2744 words)

	Université Libre de Bruxelles - page 1/11
		Alveolar macrophage activation by myeloperoxidase: a model for exacerbation of lung inflammation.
		The susceptibility of LDL to oxidation by myeloperoxidase is related to the differential count of monocytes.
		Native and recombinant proteins to analyze auto-antibodies to myeloperoxidase in pauci-immune crescentic glomerulonephritis.
	www.ulb.ac.be /ibmm/genetique-appliquee_11.html (1565 words)

	Journal of Cerebral Blood Flow & Metabolism - Abstract of article: Importance of Posttraumatic Hypothermia and ...
		However, 3 days after trauma, myeloperoxidase activity was also significantly increased within the anterior cortical segment ( P < 0.05) and in posterior cortical and subcortical regions compared to sham-operated cortex ( P < 0.0001, P < 0.05, respectively).
		Immunocytochemical analysis of myeloperoxidase reactivity at 3 hours, 24 hours, 3- and 7-days demonstrated large numbers of immunoreactive leukocytes within and associated with blood vessels, damaged tissues, and subarachnoid spaces.
		Posttraumatic hypothermia reduced myeloperoxidase activity in the injured and noninjured cortical and subcortical segments compared to normothermic values ( P < 0.05).
	www.nature.com /jcbfm/journal/v20/n3/abs/9590908a.html (577 words)

	ILM - Transfusion Medicine
		Myeloperoxidase mediated extracellular iodination during phagocytosis in granulocytes.
		Myeloperoxidase and lactoferrin of blood neutrophils and plasma in chronic granulocytic leukemia.
		Detection of lactoferrin and myeloperoxidase release from single neutrophils by a protein A plaque assay.
	www.transfumed.lu.se /E/Biblio-to.htm (1500 words)

	Journal of Cerebral Blood Flow & Metabolism - Abstract of article: Deficiency of Myeloperoxidase Increases Infarct ... (Site not responding. Last check: 2007-11-06)
		Peroxynitrite is responsible for nitration in vivo, whereas myeloperoxidase can also catalyze protein nitration in the presence of high NO levels.
		To clarify the role of myeloperoxidase in ischemic brain injury, the authors measured nitrotyrosine formation and infarct volume in myeloperoxidase-deficient or wild-type mice subjected to 2-hour focal cerebral ischemia-reperfusion.
		The authors conclude that the absence of myeloperoxidase increases ischemic neuronal damage in vivo, and that the myeloperoxidase-mediated pathway is not responsible for the nitration reaction in cerebral ischemia-reperfusion.
	www.nature.com /jcbfm/journal/v22/n1/abs/9591191a.html (356 words)

	A Randomized, Placebo-Controlled Trial of a Leukotriene Synthesis Inhibitor in Patients With COPD* -- Gompertz and ...
		Myeloperoxidase activity was measured by a chromogenic substrate
		Individual values for sputum myeloperoxidase (MPO) concentrations are shown on a logarithmic scale for the patients treated with active drug (open circles) or placebo (closed circles).
		Myeloperoxidase is a biochemical marker of neutrophil numbers
	www.chestjournal.org /cgi/content/full/122/1/289 (2824 words)

	A Model of the Oscillatory Metabolism of Activated Neutrophils -- Olsen et al. 84 (1): 69 -- Biophysical Journal
		by myeloperoxidase with melatonin as a cofactor and NADPH oxidase,
		is the cooperation of the NADPH oxidase and myeloperoxidase.
		Mechanism of reaction of myeloperoxidase with hydrogen peroxide and chloride ion.
	www.biophysj.org /cgi/content/full/84/1/69 (5837 words)

	HyTest Ltd. is a supplier of cardiac markers, human proteins, neuroscience, autoimmune and infectious disease reagents.
		Today we can proudly say that HyTest is one of the leading producers and suppliers to IVD industry of reagents for cardiac diagnostics.
		CRP can also be used for screening and monitoring of acute myocardial infarction, tissue injury and some malignant disorders.
		Myeloperoxidase is thought to be a very promising cardiac marker at the moment.
	www.hytest.fi (639 words)

	Human ELISA Kits - New Technologies - Biocompare Buyer's Guide
		Myeloperoxidase (MPO) is a major component of myeloid precursor cells.
		Myeloperoxidase is also used as a marker of airway inflammation caused either by disease, such as asthma, or environmental irritants.
		Assay Designs’ human Myeloperoxidase TiterZyme® EIA is a complete kit for the quantitative determination of Myeloperoxidase in biological fluids.
	www.biocompare.com /newtech.asp?headerid=684 (792 words)

	Homepage of Judith Sylvia FABJAN
		Myeloperoxidase and its impact on the atherogenic properties of low density lipoprotein: Lipid peroxidation versus protein modification.
		Diploma thesis at the Institute of Molecular Biology, Biochemistry and Microbiology (former Institute of Biochemistry), University of Graz on "Modifications of low density lipoprotein by myeloperoxidase: An immunological approach".
		Doctoral dissertation at the Institute of Molecular Biology, Biochemistry and Microbiology (former Institute of Biochemistry), University of Graz on modifications of lipoproteins and proteoliposomes by human myeloperoxidase - Implications for atherosclerosis".
	www.uni-graz.at /~fabjan (867 words)

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