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Topic: Myeloperoxidase deficiency

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	Myeloperoxidase - Wikipedia, the free encyclopedia
		Myeloperoxidase deficiency is a rare hereditary deficiency of the enzyme, which leads to immune deficiency.
		Historically, immunohistochemical staining for myeloperoxidase was used in the diagnosis of acute myeloid leukemia to demonstrate that the leukemic cells were derived from the myeloid lineage.
		Myeloperoxidase staining is still important in the diagnosis of extramedullary leukemia, or chloroma.
	en.wikipedia.org /wiki/Myeloperoxidase (383 words)

	MPO - myeloperoxidase
		MMP-8 is activated by hypochlorous acid produced by myeloperoxidase from hydrogen peroxide and chloride ion and by the hydroxyl radical produced in Haber Weiss reaction fed by superoxide produced by, eg, NADPH (reduced nicotinamide adenine dinucleotide) oxidase and xanthine oxidase.
		With this approach, several absorption peaks corresponding to myeloperoxidase and eosinophil peroxidase, which overlap with peaks of cytochrome b, were obliterated from reduced-minus-oxidized spectra, whereas the peaks of cytochrome b were not and could be readily quantitated.
		Myeloperoxidase activity (index of inflammatory cells) and matrix metalloproteinase 2 were also increased but only at 4 and 7 days and only in nontransgenic mice (P < 0.05 for both comparisons), and this increase correlated with inflammatory cell infiltration.
	www.ihop-net.org /UniPub/iHOP/gg/90176.html (5457 words)

	[CARD] - Biological Interventions
		Myeloperoxidase is an enzyme that is present in the white blood cells.
		It is believed that children with this deficiency may not be able to clear certain viruses completely or before the viruses affect the central nervous system.
		This hypothesis can be extended to include the possibility that, in some cases, an abnormal immune response in the mother could allow a pathogen to persist in-utero, causing damage to the developing brain of the fetus with symptoms appearing at birth or shortly thereafter.
	www.centerforautism.com /Biological/immune (2568 words)

	eMedicine - Myeloperoxidase Deficiency : Article by Javed Sheikh, MD
		Background: Myeloperoxidase (MPO) is a human enzyme in the azurophilic granules of neutrophils and in the lysosomes of monocytes.
		MPO deficiency in acquired cases is usually transient and generally resolves once the inciting condition improves.
		In most cases of acquired deficiency, the deficiency is partial and affects only a proportion of neutrophils (see Pathophysiology of acquired myeloperoxidase deficiency).
	www.emedicine.com /ped/topic1530.htm (2816 words)

	McGraw-Hill Professional Books
		Myeloperoxidase, present in the azurophilic granules of mature neutrophils, catalyzes the formation of hypochlorous acid from chloride ion and H
		Myeloperoxidase deficiency is usually not associated with clinically significant infections, with the exception of invasive fungal disease in individuals with concomitant diabetes mellitus.
		Deficiency of either of these enzymes permits autooxidative damage, which is associated with abnormal microbicidal activity.
	books.mcgraw-hill.com /getommbid.php?isbn=0071459960&template=ommbid&c=189 (512 words)

	Pathology
		Myeloperoxidase deficiency (MPO) is a common (1:2,000 individuals) autosomal recessive absence of myeloperoxidase enzyme in neutrophil and monocyte granules.
		Although people with concommittant MPO deficiency and diabetes mellitus may develop Candidiasis, MPO deficiency in most people is of no clinical consequence.
		Acquired MPO deficiency may be seen in acute myeloid leukemia, myelodysplastic syndromes, and lead poisoning.
	www.med-ed.virginia.edu /courses/path/innes/wcd/qualitative.cfm (555 words)

	Molecular Chlorine Generated by the Myeloperoxidase-Hydrogen Peroxide-Chloride System of Phagocytes Converts Low ...
		Myeloperoxidase, a heme protein secreted by phagocytes, is a potent catalyst for LDL oxidation in vitro, and active enzyme is present in human atherosclerotic lesions.
		Myeloperoxidase (donor: hydrogen peroxide, oxidoreductase, EC) was purified by lectin affinity and size exclusion chromatographies from human leukocytes obtained by leukopheresis (12, 40).
		Catalytically active myeloperoxidase is present in human vascular tissues, and oxidized LDL triggers the pathological events of atherosclerosis.
	www.jbc.org /cgi/content/full/271/38/23080 (6122 words)

	MPObase mutation publications (Site not responding. Last check: 2007-10-30)
		Biochemical and molecular characterization of hereditary myeloperoxidase deficiency.
		Hereditary myeloperoxidase deficiency due to a missense mutation of arginine 569 to tryptophan.
		Myeloperoxidase (MPO) gene mutation in hereditary MPO deficiency.
	bioinf.uta.fi /MPObase/mpopubs.html (213 words)

	Principles of Pediatric Dermatology - Chapter 31 : MANIFESTIONS OF PRIMARY IMMUNO-DEFFICIENCY DISEASES
		Myeloperoxidase deficiency is relatively common, and is inherited as an autosomal recessive trait.
		Deficiency of the early components of the classical complement activation pathway leads to different clinical manifestations depending on the type of deficient complement.
		A familial deficiency of the phagocytosisenhancing activity of serum related to a dysfunction of the fifth component of complement (C5).
	www.drmhijazy.com /english/chapters/chapter31.htm (3555 words)

	UpToDate Myeloperoxidase deficiency and other enzymatic WBC defects causing immunodeficiency
		It is also the most common primary phagocyte disorder: 1/4,000 individuals have complete MPO deficiency, and 1/2,000 have a partial defect [1-4].
		— Myeloperoxidase, encoded by a gene located at 17q23, is synthesized in neutrophils and monocytes, packaged in azurophilic granules, and released either into the phagosome or the extracellular space.
		Myeloperoxidase expression is linked to a promoter polymorphism (SP1 consensus binding site), which confers higher (G allele) or lower (A allele) activity.
	patients.uptodate.com /print.asp?print=true&file=immunnon/6761 (389 words)

	Encyclopedia :: encyclopedia : Immunology (Site not responding. Last check: 2007-10-30)
		Immunology is a broad branch of biomedical science that covers study of all aspects of the immune system in all organisms.
		It deals with, among other things, the physiological functioning of the immune system in states of both health and disease; malfunctions of the immune system in immunological disorders (autoimmune diseases, hypersensitivities, immune deficiency, allograft rejection); the physical, chemical and physiological characteristics of the components of the immune system in vitro, in situ, and in vivo.
		However, immunotherapy is also often used in the immunosuppressed (such as HIV patients) and people suffering from other immune deficiencies or autoimmune diseases.
	www.hallencyclopedia.com /Immunology (8955 words)

	Allergy & Asthma Disease Management Center: Ask the Expert: Immune Deficiency
		In the children with IgG2 deficiency, serum antibody concentrations to the capsular polysaccharide of Hemophilus influenzae type B (Hib) were significantly lower than those in age-matched controls, both before and after immunization with the Hib capsular polysaccharide antigen, which elicits antibody predominantly of the IgG2 subclass.
		BACKGROUND: A deficient antibody response to polysaccharide antigens is determined by measuring the response to the 23-valent pneumococcal polysaccharide vaccine.
		As with the T-cell immune deficiencies, the spectrum of antibody deficiencies is broad, ranging from the most severe type of antibody deficiency with totally absent B cells and serum Igs to patients who have a selective antibody deficiency with normal serum Ig.
	www.aaaai.org /aadmc/ate/immunedeficiency.html (15816 words)

	A Novel Form of Hereditary Myeloperoxidase Deficiency Linked to Endoplasmic Reticulum/Proteasome Degradation -- DeLeo ...
		Myeloperoxidase (MPO) deficiency is a common inherited disorder linked to increased susceptibility to infection and malignancy.
		Lehrer, R.I., and M.J. Cline (1969) Leukocyte myeloperoxidase deficiency and disseminated candidiasis: the role of myeloperoxidase in resistance to Candida infection.
		Cogley (1994) Hereditary myeloperoxidase deficiency due to a missense mutation of arginine 569 to tryptophan.
	www.jci.org /cgi/content/full/101/12/2900 (5927 words)

	Immune deficiency, immunizations, and yeast suppression of the immune system
		Myeloperoxidase is an enzyme present in the white blood cells (neutrophils) that combines hydrogen peroxide and chloride ions to form hypochlorite ion, the same active ingredient present in household bleach (21).
		The child was ultimately diagnosed with myeloperoxidase deficiency, and she responded well to intravenous gamma globulin therapy, which is described later in the chapter.
		Thus, IgA deficiency in autism is somewhere between 100 and 200 times higher in the autism population compared to a normal Caucasian population.
	www.greatplainslaboratory.com /BOOK/bk7sect1.html (4029 words)

	Specialty Laboratories ::: we help doctors help patients
		An abnormal result should be substantiated by measurement of phagocytic bactericidal activity and quantitation of the respiratory burst by measurement of superoxide generation, chemiluminescence, oxygen consumption or hydrogen peroxide generation.
		Deficient phagocytosis with recurrent infections can also be seen in severe G6PD deficiency, myeloperoxidase deficiency, and glutathione synthetase or reductase deficiencies.
		Severe G6PD deficiency will also present a positive NBT test and a similar clinical picture, but can be distinguished by exposure to methylene blue.
	www.specialtylabs.com /books/display.asp?id=1007 (414 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
		Incidence of myeloperoxidase deficiency in an area of northern Italy: histochemical, biochemical and functional studies.
		Leukocyte myeloperoxidase deficiency and disseminated candidiasis: the role of myeloperoxidase in resistance to Candida infection.
	iai.asm.org /cgi/content/full/67/4/1828 (5706 words)

	Re: Myeloperoxidase deficiency : possibility in A's.
		In Response To: Myeloperoxidase deficiency : possibility in A's.
		Myeloperoxidase (MPO) deficiency is 'probably' more common in type A. In years past I did measure MPO levels vicariously by looking at a Candicidial index (the ability of white cells to kill ingested yeast).
		If the white cell is MPO deficient, they can engulf Candida, but not kill it.
	www.dadamo.com /forum/archive8/config.pl?read=37858 (213 words)

	Case Based Pediatrics Chapter
		Severe combined immune deficiency (SCID) is a life-threatening syndrome of recurrent infections, oral candidiasis, persistent diarrhea, dermatitis, graft versus host disease after blood transfusion and failure to thrive caused by a number of molecular defects that lead to severe compromise in T cell function with or without B cell dysfunctions.
		Complement deficiency: Complement proteins are a key component of the innate immune system due to their function of direct lysis of their targets and being an opsonin.
		Most of the complement deficiency diseases are inherited in an autosomal recessive mode except C1 inhibitor deficiency (autosomal dominant) and properdin deficiency (X-linked).
	www.hawaii.edu /medicine/pediatrics/pedtext/s05c05.html (4533 words)

	Bioline International Official Site (site up-dated regularly)
		SETTINGS AND DESIGN: The myeloperoxidase index (MPXI) was studied in 96 patients with megaloblastic and aplastic anemia diagnosed on bone marrow aspiration and biopsy examinations.
		The biologic basis of elevated MPXI in patients with megaloblastic anemia is the presence of increased number of MPXI- laden granules in the neutrophils due to skipped cellular divisions during maturation.
		[3] Myeloperoxidase is a microbicidal protein, which exists in the primary granules of myeloid cells and takes part in the defense of the organism.
	www.bioline.org.br /request?ms04061 (1103 words)

	eMedicine - Myeloperoxidase Deficiency : Article Excerpt by: Javed Sheikh, MD
		Because most cases are undiagnosed, the condition was initially believed to be very rare; only 15 cases were reported before the 1970s.
		However, modern laboratory techniques have allowed researchers to discover that MPO deficiency is actually not so rare.
		The MPO—hydrogen peroxide—Cl system is also believed to be involved in terminating the respiratory burst, because individuals with MPO deficiency have prolonged respiratory bursts.
	www.emedicine.com /ped/byname/myeloperoxidase-deficiency.htm (581 words)

	Inside the Neutrophil Phagosome: Oxidants, Myeloperoxidase, and Bacterial Killing -- Hampton et al. 92 (9): 3007 -- ...
		Ferric myeloperoxidase (MP) reacts with hydrogen peroxide to form the redox intermediate compound I, which oxidizes chloride or thiocyanate by a single 2-electron transfer to produce the respective hypohalous acids.
		Although myeloperoxidase deficiency affects at least 1 in 4,000 people, these people are not unduly prone to infections.
		Klebanoff SJ: Myeloperoxidase: Occurrence and biological function, in Everse J, Everse KE, Grisham MB (eds): Peroxidases in Chemistry and Biology.
	www.bloodjournal.org /cgi/content/full/92/9/3007 (6348 words)

	Myeloperoxidase deficiency - Wikipedia, the free encyclopedia
		Myeloperoxidase deficiency is a genetic disorder featuring deficiency of myeloperoxidase.
		It presents with immune deficiency (especially candida albicans infections), although many people with MPO deficiency do not have a severe phenotype and do not have infections.
		This page was last modified 17:45, 16 July 2006.
	en.wikipedia.org /wiki/Myeloperoxidase_deficiency (68 words)

	Specialty Laboratories ::: we help doctors help patients
		They are antibody (B cell) deficiency, cellular (T cell) deficiency, combined T cell and B cell deficiencies and phagocyte dysfunction.
		Deficiency of one or more of these systems can be congenital,
		T cell deficiency associated with absent class I or II MHC antigens or both (bare lymphocyte syndrome)
	www.specialtylabs.com /books/display.asp?id=1019 (386 words)

	Defects in leukocyte-mediated initiation of lipid peroxidation in plasma as studied in myeloperoxidase-deficient ...
		Tyrosyl radical generated by myeloperoxidase is a physiological catalyst for the initiation of lipid peroxidation in low-density lipoprotein.
		The role of myeloperoxidase in the oxidation of biologically active polyhydroxyphenols (substituted catechols).
		Myeloperoxidase is an independent marker of coronary artery disease.
	www.bloodjournal.org /cgi/content/full/99/5/1802 (6117 words)

	Immune Phagocytes (Site not responding. Last check: 2007-10-30)
		This assay is also abnormal in patients with CGD and is reduced in X-linked CGD carriers, in lactoferrin deficiency and in myeloperoxidase deficiency.(45) During chemiluminescence assays, a scintillation spectrometer is employed to measure light energy produced during microbial killing.
		During phagocytosis, free oxygen radicals are produced by neutrophils and monocytes which then react with oxidizable substrates on microbes including unsaturated lipids, peptides, and nucleic acids to form unstable intermediates which will release light energy when returning to their ground state.(45) Specific assays to measure neutrophil superoxide production are also available.
		For specific granule deficiency, abnormalities in chemotaxis should also be present as a screening test and an anti-lactoferrin stain of the neutrophil should demonstrate markedly reduced expression of lactoferrin, a specific granule constituent.
	www.jcaai.org /param/Immune/Phag.HTM (582 words)

	Pre- and Post-surgery Health - Vitacost (Site not responding. Last check: 2007-10-30)
		Zinc supplements given to patients before surgery prevented zinc deficiency in one study, but the effect of these supplements on post-surgical health was not evaluated.
		One preliminary study found iron levels to be reduced after both minor and major surgeries, and iron supplementation prior to surgery was not able to prevent this reduction.
		Some researchers speculate that iron deficiency after a trauma such as surgery is an important mechanism for avoiding infection, and they suggest that iron supplements should not be given after surgery.
	www.vitacost.com /science/hn/Concern/Surgery.htm (4711 words)

	Nauseef Publications (Site not responding. Last check: 2007-10-30)
		Nauseef, W.M., Root, R.K., and Malech, H.L.: Biochemical and Immunologic Analysis of Hereditary Myeloperoxidase Deficiency.
		Nauseef, W.M., Brigham, S., and Cogley, M.: Hereditary Myeloperoxidase Deficiency due to a Missense Mutation of Arginine 569 to Tryptophan.
		Nauseef, W.M., McCormick, S.J., and Clark, R.A.: Calreticulin Functions as a Molecular Chaperone in the Biosynthesis of Myeloperoxidase.
	www.medicine.uiowa.edu /microbiology/publications/nauseef.htm (2162 words)

	Increased atherosclerosis in myeloperoxidase-deficient mice -- Brennan et al. 107 (4): 419 -- Journal of Clinical ...
		MPO immunostaining in lesions from wild-type and deficient mice.
		Lehrer, R.I., and Cline, M.J. Leukocyte myeloperoxidase-deficiency and disseminated candidiasis: the role of myeloperoxidase in resistance to Candida infection.
		Myeloperoxidase polymorphism is associated with gender specific risk for Alzheimer’s disease.
	www.jci.org /cgi/content/full/107/4/419 (6728 words)

	Intracellular Reactions in Single Human Granulocytes upon Phorbol Myristate Acetate Activation using Confocal Raman ...
		Insight into chromophore structure and evidence that the chromophores of myeloperoxidase are equivalent.
		Heme-protein interaction in myeloperoxidase: modification of spectroscopic properties and catalytic activity by single residue mutation.
		Site-directed mutagenesis of Met243, a residue of myeloperoxidase involved in the binding of the prosthetic group.
	www.biophysj.org /cgi/content/full/78/5/2606 (3634 words)

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