corneal opacity/tyrosine

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Corneal opacities associated with NTBC treatment.

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OBJECTIVE To describe a patient with hereditary tyrosinemia type I (HHT-I) treated with 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione (NTBC) who developed corneal opacities. METHODS A 14-month-old patient was diagnosed with HHT-I and began treatment with NTBC. Her serial ocular

Analysis of Melanin-like Pigment Synthesized from Homogentisic Acid, with or without Tyrosine, and Its Implications in Alkaptonuria.

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Alkaptonuria is an iconic disease used by Archibald Garrod to demonstrate the theory of "inborn errors of metabolism". AKU knowledge has advanced in recent years: development of an in vitro model, discovery of murine models and advances in understanding bone and cartilage phenotypes and arthropathy

Richner-Hanhart syndrome detected by expanded newborn screening.

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Richner-Hanhart syndrome (tyrosinemia type 2) is an inborn error of tyrosine metabolism which is clinically characterized mainly by oculocutaneous symptoms including corneal opacities and keratosis palmoplantaris. Skin symptoms usually develop after the first year of life. We report a neonate in

Triketone toxicity: a report on two cases of sulcotrione poisoning.

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BACKGROUND Sulcotrione is a herbicidal agent belonging to the family of triketones. Sulcotrione herbicides are used for weed control in maize and flax crops. To date, no cases of human poisoning had been reported in the literature linked to different herbicidal agents in the triketone family. We

TGF alpha can act as a chemoattractant to perioptic mesenchymal cells in developing mouse eyes.

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Growth factors are believed to play an important role in regulating cell fate and cell behavior during embryonic development. Transforming growth factor alpha (TGF alpha), a member of the epidermal growth factor (EGF) superfamily, is a small polypeptide growth factor. Upon binding to its receptor,

Richner-Hanhart syndrome (tyrosinemia type II): a case report of delayed diagnosis with pseudodendritic corneal lesion.

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Richner-Hanhart syndrome (tyrosinemia type II) is a rare autosomal recessive disease associated with high serum tyrosine levels caused by the deficiency of tyrosine aminotransferase enzyme. We report a 15-year-old female patient with complaints of bilateral photophobia and tearing, which started

[Therapy for systemic metabolic disorders based on the detection of basic corneal landmarks in childhood].

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Many systemic lysosomal storage disorders show basic corneal opacities already in childhood. The lysosome is a cell organelle, produced by Golgi's apparatus, that is surrounded by a membrane and contains hydrolytic enzymes that break down food molecules, especially proteins and other complex

Successful dietary control of tyrosinemia II.

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A Japanese girl, 2 years, 8 months of age, with palmoplantar keratosis and dendritic corneal opacities, showed increased tyrosine levels in the plasma, urine, and cerebrospinal fluid. The mental and physical growth was not retarded. The hepatorenal functions were within normal limits. Electron

Predicting tyrosinaemia: a mathematical model of 4-hydroxyphenylpyruvate dioxygenase inhibition by nitisinone in rats.

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Nitisinone or 2-(2-nitro-4-trifluoromethylbenzoyl)cyclohexane-1,3-dione is a reversible inhibitor of 4-hydroxyphenylpyruvate dioxygenase (HPPD), an enzyme important in tyrosine catabolism. Today, nitisinone is successfully used to treat Hereditary Tyrosinaemia type 1, although its original expected

The Richner-Hanhart syndrome: report of a case with associated tyrosinemia.

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The Richner-Hanhart syndrome with tyrosinemia was recognized in a mentally retarded adolescent boy. The clinical manifestations, including hyperkeratosis of the volar aspects of the hands and feet, thickening of the conjunctival epithelium, and corneal opacities, as well as biochemical aberrations

Ophthalmic follow-up of patients with tyrosinaemia type I on NTBC.

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NTBC has revolutionized the management of tyrosinaemia type I, although animal experiments have shown that long-term administration may produce corneal opacities analogous to those in tyrosinaemia type II. We have assessed the prevalence of ocular side-effects in 11 tyrosinaemia type I patients on

Tyrosinemia type II in two cases previously reported as Richner-Hanhart syndrome.

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Two sibs with palmo-plantar keratosis and dendritic corneal opacities, previously described as suffering from Richner-Hanhart syndrome by other authors, about 25 years ago, showed increased plasma and urine tyrosine levels. Their neurological and mental features were within normal limits. A

A Central Role for Sympathetic Nerves in Herpes Stromal Keratitis in Mice.

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OBJECTIVE Herpes simplex virus type 1 (HSV-1) is a neurotrophic virus that can cause herpes stromal keratitis (HSK), a severe corneal inflammation that can lead to corneal scarring and blindness. This study identified neurologic changes that occur in HSV-1-infected corneas and related them to

Corneal dystrophies.

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The term corneal dystrophy embraces a heterogenous group of bilateral genetically determined non-inflammatory corneal diseases that are restricted to the cornea. The designation is imprecise but remains in vogue because of its clinical value. Clinically, the corneal dystrophies can be divided into

Tyrosinemia produced by 2-(2-nitro-4-trifluoromethylbenzoyl)-cyclohexane-1,3-dione (NTBC) in experimental animals and its relationship to corneal injury.

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2-(2-Nitro-4-trifluoromethylbenzoyl)-cyclohexane-1,3-dione (NTBC) is a potent inhibitor of rat liver 4-hydroxyphenylpyruvate dioxygenase (HPPD) leading to tyrosinemia and corneal opacity. We examined the effect of NTBC on the extent of tyrosinemia and production of corneal lesions in the beagle dog,

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