homocystinuria/glutathione

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Effect of cysteine dosage on erythrocyte glutathione synthesis rate in a patient with cystathionine beta synthase deficiency.

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Cystathionine β-synthase (CBS)-deficient patients develop premature arteriosclerosis and thrombosis leading to a high risk of a vascular event before the age of 30 years. In CBS deficiency the transsulfuration pathway is impaired, leading to markedly elevated levels of homocysteine and methionine,

Homocysteine and cysteine - albumin binding in homocystinuria: assessment of cysteine status and implications for glutathione synthesis?

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Measurement of plasma total cysteine rather than free dimeric cystine gives a better indication of cysteine status in homocystinuric patients. This is the result of displacement of cysteine from albumin by homocysteine and is related to the plasma homocysteine concentration. In control subjects the

Taurine alleviates repression of betaine-homocysteine S-methyltransferase and significantly improves the efficacy of long-term betaine treatment in a mouse model of cystathionine β-synthase-deficient homocystinuria.

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Classical cystathionine β-synthase-deficient homocystinuria (HCU) is a life-threatening inborn error of sulfur metabolism. Treatment for pyridoxine-nonresponsive HCU involves lowering homocysteine (Hcy) with a methionine (Met)-restricted diet and betaine supplementation. Betaine treatment efficacy

Homocystinuria due to cystathionine beta-synthase deficiency: novel biochemical findings and treatment efficacy.

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To explore the pathogenesis of cystathionine beta-synthase (CBS) deficiency and to test the efficacy of pharmacological therapy we examined a panel of metabolites in nine homocystinuric patients under treated and/or untreated conditions. Off pharmacological treatment, the biochemical phenotype was

Taurine treatment prevents derangement of the hepatic γ-glutamyl cycle and methylglyoxal metabolism in a mouse model of classical homocystinuria: regulatory crosstalk between thiol and sulfinic acid metabolism.

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Cystathionine β-synthase-deficient homocystinuria (HCU) is a poorly understood, life-threatening inborn error of sulfur metabolism. Analysis of hepatic glutathione (GSH) metabolism in a mouse model of HCU demonstrated significant depletion of cysteine, GSH, and GSH disulfide independent of the block

Genetic disorders of glutathione and sulfur amino-acid metabolism. New biochemical insights and therapeutic approaches.

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Important insights have recently been derived from studies of inborn human defects of sulfur metabolism. Metabolic lesions responsible for homocystinuria have been elucidated, with possible implications for understanding atherogenesis in the general population. The cause of cystinosis remains

Cystathionine beta-synthase deficiency alters hepatic phospholipid and choline metabolism: Post-translational repression of phosphatidylethanolamine N-methyltransferase is a consequence rather than a cause of liver injury in homocystinuria.

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Classical homocystinuria (HCU) due to inactivating mutation of cystathionine β-synthase (CBS) is a poorly understood life-threatening inborn error of sulfur metabolism. A previously described cbs-/- mouse model exhibits a semi-lethal phenotype due to neonatal liver failure. The transgenic HO mouse

Leptin concentrations and SCD-1 indices in classical homocystinuria: Evidence for the role of sulfur amino acids in the regulation of lipid metabolism.

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BACKGROUND We describe body composition, lipid metabolism and Stearoyl-CoA desaturase-1 (SCD-1) indices in patients with classical homocystinuria (HCU). METHODS Eleven treated HCU patients and 16 healthy controls were included. Body composition and bone mineral density were assessed by dual X-ray

Homocystinuria with congenital/developmental cataract.

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The aim of the study is to screen patients for homocystinuria with and without cataract and analyse for homocystine and methionine. Fifty-eight samples from 29 patients, i.e., plasma and urine collected after overnight fasting were analysed by the screening test for homocystine, and paper

Accumulation of pyroglutamic acid (5-oxoproline) in homocystinuria.

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A 12-year-old boy with homocystinuria due to a cystathionine synthetase defect was shown to accumulate large amounts of pyroglutamic acid (pyroglu). In four different urine samples the concentration ranged between 4.1 and 9.7 mol/mol of creatinine. The pyroglu concentration in plasma was 1.6 mmol/l,

Cystathionine beta synthase deficiency induces catalase-mediated hydrogen peroxide detoxification in mice liver.

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Cystathionine beta synthase deficiency induces hyperhomocysteinemia which is considered as a risk factor for vascular diseases. Studies underlined the importance of altered cellular redox reactions in hyperhomocysteinemia-induced vascular pathologies. Nevertheless, hyperhomocysteinemia also induces

Glutathione metabolism in cobalamin deficiency type C (cblC).

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BACKGROUND Methylmalonic aciduria with homocystinuria, cblC defect, is the most frequent disorder of vitamin B12 metabolism. CblC patients are commonly treated with a multidrug therapy to reduce metabolite accumulation and to increase deficient substrates. However the long-term outcome is often

Cystathionine beta-synthase deficiency causes fat loss in mice.

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Cystathionine beta synthase (CBS) is the rate-limiting enzyme responsible for the de novo synthesis of cysteine. Patients with CBS deficiency have greatly elevated plasma total homocysteine (tHcy), decreased levels of plasma total cysteine (tCys), and often a marfanoid appearance characterized by

Effect of cadmium administration in hyperhomocysteinemic mice due to cystathionine beta synthase deficiency.

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Homocysteine, a sulfur-containing amino acid formed during the metabolism of methionine, is commonly slightly elevated in the plasma of the general population. Additionally, we previously found that cystathionine beta synthase-deficient mice, a murine model of hyperhomocysteinemia, exhibit altered

Analysis of Total Thiols in the Urine of a Cystathionine β-Synthase-Deficient Mouse Model of Homocystinuria Using Hydrophilic Interaction Chromatography.

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Homocysteine and related thiols (cysteine, cysteinylglycine, and glutathione) in the urine of a cystathionine β-synthase (CBS)-deficient mouse model were quantified using hydrophilic interaction chromatography with fluorescence detection. Urine samples were incubated with tris(2-carboxyethyl)

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