cystinosis/glutathione

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Enzymic reduction of cystine and glutathione in cultivated human fibroblast from normal subjects and patients with cystinosis.

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Cystine glutathione transhydrogenase, cystine-reductase, and glutathion reductase activities were studied in cultivated skin fibroblasts of control subjects and of three patients with cystinosis. Specific activity, pH optima, electrophoretic mobility, and kinetic parameters were described. Evidence

Thioredoxin and glutathione in cultured fibroblasts from human cases with 5-oxoprolinuria and cystinosis.

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[Ergothioneine and reduced ergothioneine/glutathione (GSH) ratio in erythrocytes of patients with cystinosis and in heterozygotes].

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Altered status of glutathione and its metabolites in cystinotic cells.

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BACKGROUND Cystinosis is an autosomal recessive disorder, caused by mutations of the lysosomal cystine carrier cystinosin, encoded by the CTNS gene (17p13). The concomitant intralysosomal cystine accumulation leads to multi-organ damage, with kidneys being the first affected. Altered mitochondrial

Glutathione precursors replenish decreased glutathione pool in cystinotic cell lines.

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Cystinosis is an inherited disorder due to mutations in the CTNS gene which encodes cystinosin, a lysosomal transmembrane protein involved in cystine export to the cytosol. Both accumulation of cystine in the lysosome and decreased cystine in the cytosol may participate in the pathogenic mechanism

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

N-acetyl-cysteine is associated to renal function improvement in patients with nephropathic cystinosis.

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BACKGROUND Nephropathic cystinosis is an autosomal recessive systemic severe disease characterized by intralysosomal cystine storage. Cysteamine is an essential component of treatment. There is solid evidence that cystine accumulation itself is not responsible for all abnormalities in cystinosis;

A futile cycle, formed between two ATP-dependant gamma-glutamyl cycle enzymes, gamma-glutamyl cysteine synthetase and 5-oxoprolinase: the cause of cellular ATP depletion in nephrotic cystinosis?

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Cystinosis, an inherited disease caused by a defect in the lysosomal cystine transporter (CTNS), is characterized by renal proximal tubular dysfunction. Adenosine triphosphate (ATP) depletion appears to be a key event in the pathophysiology of the disease, even though the manner in which ATP

Impaired activity of the gamma-glutamyl cycle in nephropathic cystinosis fibroblasts.

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Cystinotic patients have been shown to excrete in their urine high levels of pyroglutamate, an intermediate metabolite of the adenosine triphosphate (ATP)-dependent gamma-glutamyl cycle, which is responsible for glutathione (GSH) synthesis. Human fibroblasts were used to study the mechanisms leading

Elevated oxidized glutathione in cystinotic proximal tubular epithelial cells.

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Cystinosis, the most frequent cause of inborn Fanconi syndrome, is characterized by the lysosomal cystine accumulation, caused by mutations in the CTNS gene. To elucidate the pathogenesis of cystinosis, we cultured proximal tubular cells from urine of cystinotic patients (n = 9) and healthy controls

Cysteamine restores glutathione redox status in cultured cystinotic proximal tubular epithelial cells.

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Recent evidence implies that impaired metabolism of glutathione has a role in the pathogenesis of nephropathic cystinosis. This recessive inherited disorder is characterized by lysosomal cystine accumulation and results in renal Fanconi syndrome progressing to end stage renal disease in the majority

Lysosomal cystine storage in cystinosis and mucolipidosis type II.

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Cultured fibroblasts from mucolipidosis II (ML-II) patients demonstrated an elevated cystine content which increased with time in culture compared to fibroblasts from cystinotic patients or normal controls under the same conditions. In both cystinotic and ML-II cells the increased levels of cystine

Cystinotic fibroblasts accumulate cystine from intracellular protein degradation.

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Fibroblasts derived from patients with cystinosis, an autosomal recessive condition, accumulate the disulfide amino acid cystine within lysosomes. The metabolic defect leading to the cystine accumulation and the source from which the cystine is derived are unknown. In this report we present data

Decrease of intracellular cystine content in cystinotic fibroblasts by inhibitors of gamma-glutamyl transpeptidase.

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Cystine content of skin fibroblasts derived from patients with cystinosis was decreased by inhibitors of gamma-glutamyl transpeptidase, the initial enzyme in glutathione catabolism. The addition of maleate or the gamma-glutamyl hydrazone of alpha-ketobutyric acid to culture medium (1-20 mM) resulted

Increased human dermal microvascular endothelial cell survival induced by cysteamine.

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BACKGROUND Cystinosis is an autosomal recessive disease caused by intralysosomal cystine accumulation, treated with cysteamine. Recently, new adverse effects of cysteamine were reported. Skin biopsies showed microvascular proliferation (angioendotheliomatosis). To examine the mechanism of

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