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Study of Homocysteine Metabolism in Homocystinuria

2014-08-27 03:58:18 | BioPortfolio

Summary

OBJECTIVES: I. Determine basal and postmethionine plasma homocysteine in patients with premature vascular disease, cystathionine beta-synthase (CBS) or methylenetitrahydrofolate reductase (MTHFR) deficiency, and in obligate heterozygotes for CBS or MTHFR.

II. Determine whole-body homocysteine metabolic rates with isotopically-labeled methionine.

Description

PROTOCOL OUTLINE: This is a two-part study of homocysteine metabolism. Age-matched normal controls are entered in both parts of the study.

In first part of the study, participants are given oral methionine; baseline and postmethionine studies include amino acid quantitation, analysis of rapidly deproteinized plasma, and total plasma homocysteine.

In the second part of the study, participants (men and postmenopausal women only) undergo methionine tracer studies.

Study Design

Primary Purpose: Screening

Conditions

Homocystinuria

Status

Completed

Source

Office of Rare Diseases (ORD)

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:58:18-0400

Clinical Trials [4 Associated Clinical Trials listed on BioPortfolio]

Homocystinuria: Treatment With N-Acetylcysteine

The purpose of this study is determine if oral N-acetylcysteine is effective in lowering homocysteine in individuals with homocystinuria.

Natural History Study of Cystathionine Beta-synthase Deficiency Homocystinuria (CBSDH)

The purpose of the study is to characterize the clinical course of Cystathionine Beta-synthase Deficiency Homocystinuria (CBSDH) in pediatric and adult patients under current clinical mana...

OT-58 as an Enzyme Replacement Therapy for Patients With Cystathionine Beta-Synthase Deficient Homocystinuria (CBSDH)

Cystathionine Beta-Synthase (CBS) Deficient Homocystinuria (CBSDH) is a rare autosomal-recessive metabolic condition characterized by an excess of homocysteine (Hcy) in the plasma, tissues...

Normal Values of Oxidative Stress, Taurine, and Related Markers

The role of oxidative stress in disease pathology is increasingly recognized. At present, the development of biomarkers of this state is in its infancy and the availability of clinically v...

PubMed Articles [5 Associated PubMed Articles listed on BioPortfolio]

Atypical adult-onset methylmalonic acidemia and homocystinuria presenting as hemolytic uremic syndrome.

Thrombotic microangiopathy (TMA) syndromes can be secondary to a multitude of different diseases. Most can be identified with a systematic approach and, when excluded, TMA is generally attributed to ...

CBS mutations are good predictors for B6-responsiveness: A study based on the analysis of 35 Brazilian Classical Homocystinuria patients.

Classical homocystinuria (HCU) is a monogenic disease caused by the deficient activity of cystathionine β-synthase (CβS). The objective of this study was to identify the CBS mutations in Brazilian p...

Crystal Structure of cystathionine β-synthase from honeybee Apis mellifera.

Cystathionine β-synthase (CBS), the key enzyme in the transsulfuration pathway, links methionine metabolism to the biosynthesis of cellular redox controlling molecules. CBS catalyzes the pyridoxal-5'...

Late-onset cobalamin C deficiency Chinese sibling patients with neuropsychiatric presentations.

The Cobalamin C deficiency (cblC), characterized with elevated methylmalonic acidemia and homocystinuria in plasma, is an inborn error of cobalamin metabolism. The late-onset cblC siblings patients we...

Transcellular transport of cobalamin in aortic endothelial cells.

Cobalamin [Cbl (or B)] deficiency causes megaloblastic anemia and a variety of neuropathies. However, homeostatic mechanisms of cyanocobalamin (CNCbl) and other Cbls by vascular endothelial cells are ...

Medical and Biotech [MESH] Definitions

A multifunctional pyridoxal phosphate enzyme. In the second stage of cysteine biosynthesis it catalyzes the reaction of homocysteine with serine to form cystathionine with the elimination of water. Deficiency of this enzyme leads to HYPERHOMOCYSTEINEMIA and HOMOCYSTINURIA. EC 4.2.1.22.

A naturally occurring compound that has been of interest for its role in osmoregulation. As a drug, betaine hydrochloride has been used as a source of hydrochloric acid in the treatment of hypochlorhydria. Betaine has also been used in the treatment of liver disorders, for hyperkalemia, for homocystinuria, and for gastrointestinal disturbances. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1341)

Condition in which the plasma levels of homocysteine and related metabolites are elevated (>13.9 μmol/l). Hyperhomocysteinemia can be familial or acquired. Development of the acquired hyperhomocysteinemia is mostly associated with vitamins B and/or folate deficiency (e.g., PERNICIOUS ANEMIA, vitamin malabsorption). Familial hyperhomocysteinemia often results in a more severe elevation of total homocysteine and excretion into the urine, resulting in HOMOCYSTINURIA. Hyperhomocysteinemia is a risk factor for cardiovascular and neurodegenerative diseases, osteoporotic fractures and complications during pregnancy.

Autosomal recessive inborn error of methionine metabolism usually caused by a deficiency of CYSTATHIONINE BETA-SYNTHASE and associated with elevations of homocysteine in plasma and urine. Clinical features include a tall slender habitus, SCOLIOSIS, arachnodactyly, MUSCLE WEAKNESS, genu varus, thin blond hair, malar flush, lens dislocations, an increased incidence of MENTAL RETARDATION, and a tendency to develop fibrosis of arteries, frequently complicated by CEREBROVASCULAR ACCIDENTS and MYOCARDIAL INFARCTION. (From Adams et al., Principles of Neurology, 6th ed, p979)

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