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l ornithine/atrofi

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A deficiency of the mitochondrial matrix enzyme L-ornithine: 2-oxoacid aminotransferase causes gyrate atrophy of the choroid and retina with hyperornithinemia (MIM 258870), a blinding degenerative disease, which is inherited as an autosomal recessive trait. We have developed a sensitive
Deficient activity of L-ornithine:2-oxoacid aminotransferase is associated with gyrate atrophy of the choroid and retina with hyperornithinemia, an autosomal recessive disease leading to blindness. Liver tissue from two patients contained trace activity of the enzyme. The Michaelis (Km) value of the
L-Ornithine-ketoacid-transaminase deficiency was established in cultured fibroblasts obtained from a patient with hyperornithinaemia (mean ornithine level in serum approximately 100 mumol/l) and gyrate atrophy of the choroid and retina. The deficiency was found both the L-ornithine concentrations of

L-Ornithine ketoacid-transaminase assay in hair roots of homozygotes and heterozygotes for gyrate atrophy.

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[Retinal degeneration after intravitreal injection of ornithine. 2. Late change after administration].

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The influence of intravitreal injection of a small amount of l-ornithine hydrochloride in monkey eyes has been investigated morphologically. In a previous paper, the author demonstrated that acute selective damage was caused in the retinal pigment epithelium (RPE) by ornithine. This paper will

Experimental induction of pancreatic carcinomas in the hamster with N delta-(N-methyl-N-nitrosocarbamoyl)-L-ornithine.

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Carcinomas of the pancreas, stomach, and breast, as well as mesotheliomas and ovarian stromal tumors, were induced in Syrian golden hamsters treated with N delta-(N-methyl-N-nitrosocarbamoyl)-L-ornithine (MNCO), which has previously been shown to cause pancreatic acinar cell carcinomas in rats. The
We measured L-ornithine oxidation in cultured skin fibroblasts from seven patients with hyperornithinaemia-hyperammonaemia-homocitrullinuria (HHH) syndrome (McKusick 23897), and compared it with oxidation by ornithine aminotransferase deficient gyrate atrophy (McKusick 25887) cells and lysinuric

Ornithine ketoacid transaminase deficiency in gyrate atrophy of the choroid and retina.

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Gyrate atrophy of the choroid and retina is a chorioretinal degeneration associated with hyperornithinemia with an autosomal recessive mode of inheritance. Cultured skin fibroblasts from five affected patients showed a virtual absence of ornithine ketoacid transaminase (OKT) (L-ornithine:2-oxoacid

Gyrate atrophy of the choroid and retina: deficiency of ornithine aminotransferase in transformed lymphocytes.

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Gyrate atrophy of the choroid and retina is an inherited form of chorioretinal degeneration associated with hyperornithinemia. We measured the activity of ornithine aminotransferase (L-ornithine:2-oxo-acid aminotransferase, EC 2.6.1.13) in phytohemagglutinin-stimulated lymphocytes of a patient with
OBJECTIVE To examine a possible effect of 7-methylxanthine, theobromine, acetazolamide, or L-ornithine on the ultrastructure and biochemical composition of rabbit sclera. METHODS Groups of pigmented rabbits, six in each group, were dosed during 10 weeks with one of the substances under

Gyrate atrophy of the retina: inborn error of L-ornithin:2-oxoacid aminotransferase.

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Cultured fibroblasts from a patient with gyrate atrophy of the retina do not convert L-ornithine, uniformly labeled with carbon-14, to proline. This metabolic block is caused by deficient L-ornithine:2-oxoacid aminotransferase activity in the patient. Her heterozygote father has intermediate

At least two mutant alleles of ornithine delta-aminotransferase cause gyrate atrophy of the choroid and retina in Finns.

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Gyrate atrophy of the choroid and retina (GA) is an inherited chorioretinal degeneration caused by deficiency of ornithine delta-aminotransferase (OAT; L-ornithine: 2-oxo-acid aminotransferase; EC 2.6.1.13). GA is one of the "Finnish genetic diseases," a group of several rare monogenic disorders

Effect of long-term treatment of L-ornithine on visual function and retinal histology in the rats.

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L-Ornithine is a non-proteinogenic amino acid, abundant in freshwater clams and commercially available as an oral nutritional supplement. L-Ornithine is metabolized by ornithine-δ-aminotransferase. Deficiency of this enzyme causes gyrate atrophy of the choroid and retina, an autosomal recessive
BACKGROUND The totally gastrectomized (TGX) rat is a new experimental model with which to produce widespread spongy vacuolation in spinal cord (SC) white matter, strongly reminiscent of that observed in subacute combined degeneration (SCD) of human SC. METHODS We did in long-term experiments
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