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Página 1 a partir de 213 resultados
Rod electroretinograms in an elevated cyclic guanosine monophosphate-type human retinal degeneration. Comparison with retinitis pigmentosa.
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Unusual rod electroretinogram (ERG) intensity-response functions were recorded from three female patients with retinal degeneration who had visual acuities of 20/200, retinal arteriolar narrowing, and diffuse granularity of the retinal pigment epithelium. All three patients had rod b-waves that were
Abnormal guanosine 3', 5'-monophosphate during photoreceptor degeneration in the inherited retinal disorder of C3H/HeJ mice.
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Elevated levels of guanosine 3'-5'-monophosphate (cyclic GMP) are associated with photoreceptor degeneration in the retina of C3H/HeJ mice. This abonormality has been shown to result from a deficiency in the activity of a receptor-specific cyclic GMP phosphodiesterase. The apparent susceptibility of
The purine nucleosides adenosine and guanosine delay axonal degeneration in vitro.
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Axonal degeneration is a key component of many neurodegenerative diseases. Injured axons undergo a program of self-destruction termed Wallerian degeneration that is an active, well-regulated process. The pathways leading to axon fragmentation are uncharacterized, but experiments with wld(s) mutant
Cyclic guanosine monophosphate: elevation in degenerating photoreceptor cells of the C3H mouse retina.
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As a result of an early deficiency in cyclic nucleotide phosphodiesterase activity, guanosine 3',5'-monophosphate accumulates in retinal photoreceptor cells before they begin to degenerate. It is suggested that degeneration of the photoreceptor cells is related to an imbalance in their metabolism or
A proposed link between debris accumulation, guanosine 3', 5' cyclic monophosphate changes and photoreceptor cell degeneration in retina of RCS rats.
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[Guanosine-3',5'-monophosphate: metabolic defect related to hereditary degeneration of visual rod cells in animals].
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Cyclic nucleotide phosphodiesterases in dystrophic rat retinas: guanosine 3',5' cyclic monophosphate anomalies during photoreceptor cell degeneration.
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Hyperlipidaemia induced by a high-cholesterol diet leads to the deterioration of guanosine-3',5'-cyclic monophosphate/protein kinase G-dependent cardioprotection in rats.
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OBJECTIVE
Hyperlipidaemia interferes with cardioprotective mechanisms, but the cause of this phenomenon is largely unknown, although hyperlipidaemia impairs the cardioprotective NO-cGMP system. However, it is not known if natriuretic peptide-cGMP-protein kinase G (PKG) signalling is affected by
Downregulation of angiogenic factors and their downstream target molecules affects the deterioration of erectile function in a rat model of hypercholesterolemia.
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OBJECTIVE
To evaluate how the expression of angiogenic factors and their downstream target molecules, which are potentially involved in penile homeostasis, is related to erectile dysfunction in a rat model of hypercholesterolemia.
METHODS
Fifty-six 2-month-old male Sprague-Dawley rats were included
Retinal degeneration and rd1 mutation in NC/Tnd mice-a human atopic dermatitis model.
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OBJECTIVE
NC/Tnd mice, a spontaneous model for human atopic dermatitis, are also useful animal models for various corneal disorders accompanying allergic diseases. The purposes of the current study were to investigate the development of retinal degeneration in NC/Tnd mice.
METHODS
Histological
Effect of icariin in combination with daily sildenafil on penile atrophy and erectile dysfunction in a rat model of bilateral cavernous nerves injury.
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The commonly utilized phosphodiesterase type 5 inhibitors do not lead to satisfactory penile erection after radical prostatectomy mainly because of insufficient nitric oxide drive from the damaged cavernous nerves. The aim of this study was to assess the efficacy and mechanisms of icariin in
Dentatorubral pallidoluysian atrophy in a Turkish family.
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Dentatorubral pallidoluysian atrophy is a neurodegenerative disease that generally presents in adulthood. Although rare, it can be observed in childhood due to extreme expansion of the triplet repeat size during spermatogenesis. The diagnosis in childhood is very difficult in the absence of family
Guanosine prevents depressive-like behaviors in rats following bilateral dorsolateral striatum lesion induced by 6-hydroxydopamine.
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The dorsolateral striatum (DLS) processes motor and non-motor functions and undergoes extensive dopaminergic degeneration in Parkinson's disease (PD). Beyond the nigrostriatal pathway, dopaminergic degeneration also affects other brain areas including the pre-frontal cortex (PFC) and hippocampus,
Guanosine triphosphate cyclohydrolase I deficiency: a rare cause of hyperphenylalaninemia.
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Tetrahydrobiopterin (BH4) deficiencies are a heterogeneous group of disorders caused by a defect in two of the three enzymes involved in its biosynthesis or in the two recycling enzymes. Except for the deficiency of dehydratase, an enzyme catalyzing a reaction in the recycling pathway, all other
A comprehensive survey of mutations in the OPA1 gene in patients with autosomal dominant optic atrophy.
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OBJECTIVE
To characterize the spectrum of mutations in the OPA1 gene in a large international panel of patients with autosomal dominant optic atrophy (adOA), to improve understanding of the range of functional deficits attributable to sequence variants in this gene, and to assess any
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