Disorders of Neurotransmitters Diseases Review

Neurological Disease is one of Health Problems

2011-12-10T21:35:00.000-08:00

Diseases, metabolic disorders, and often even the same text can be caused by non-neurological symptoms due to congenital metabolic disease that primarily affects the nervous system, and a great challenge for correct diagnosis. Neurometabolic disease rather than a separate development delay / psychopathy, seizures, dystonia, ataxia or general signs and non-specific, begins. They, especially when the disease is organ or progressive neurological or should additional suspected of being involved in this. The main clue is the "simple" neuroanatomic not be explained by the presence of a variety of neurological symptoms.

For example, coma, ataxia, or especially at the end of the metabolic pathway - the start of the main features of inborn errors of neurological manifestations present with chronic or recurrent attacks of abnormal behavior. Many of these diseases, early diagnostic methods based on metabolic testing. During the attack of organic liquid collected in the main. If your project is the first treatment choice for the investigation, and is always considered to be impaired.

Metabolic investigations are usually separated during the middle childhood developmental delays in speech development delay was a child, such as fever, occasional seizures, or epilepsy syndrome, suggesting that there is no explicit. Outside the field of metabolism and other genetic roganidanavanne and particularly psychopathy, ataxia, dystonia, and spastic paraplegia, as a reason for that has been made.

Neurotransmitters and Neuromodulators

2011-12-09T04:01:00.000-08:00

In some classes neuromodulation neurotransmitters regulate diverse populations of neurons central nervous system (one neuron uses different neurotransmitters to connect to multiple neurons). This is in contrast to direct synaptic transmission, in which one presynaptic neuron directly affect postsynaptic partner (one neuron reaching one other neuron), neuromodulatory transmitters secreted by a small group of neurons spread over large areas of the nervous system, the effect on some neurons. Some examples include the neuromodulators are dopamine, serotonin, acetylcholine, histamine and many others.

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Neuromodulator is a relatively new concept. It can be conceptualized as a neurotransmitter that is not absorbed by pre-synaptic neuron or broken down into metabolites. Neuromodulators like that end up spending a large amount of time in the CSF (cerebrospinal fluid), influence (or modulating) the overall level of brain activity. For this reason, several neurotransmitters are also considered as neuromodulators, such as serotonin and acetylcholine.

Neurotransmitters and Neuromodulators: Handbook of Receptors and Biological Effects

Neuromodulation is often contrasted with the classical fast synaptic transmission. In both cases the transmitter works on local postsynaptic receptors, but in neuromodulation usually 7-membrane receptor that includes the G-protein coupled receptors, while in the second case they are ligand-gated ion channel. Former type of synaptic transmission often involve effects on voltage-gated ion channels, and quite slow. The latter type is much faster. Related differences are also sometimes drawn between the modulator and the synaptic inputs to neurons driver, but here the emphasis is on ongoing modulation of neuronal spiking vs. spiking causing it.

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Neurotransmitters Disorders of Gamma Glutamyl Transpeptidase Deficiency

2011-02-11T21:01:00.000-08:00

Five patients with gamma glutamyl transpeptidase deficiency have been reported or are under investigation. Three of them have CNS involvement, though two siblings have apparently no signs of CNS damage.

This may reflect the fact that the first three patients were identified by screening for amino acid defects in populations of mentally retarded patients.

The patients have increased glutathione concentrations in plasma and urine, butthe cellular levels are normal. In addition to glutathionuria, urinary levels of gamma glutamyl cysteine and cysteine are also increased.

The patients are often identified by urinary screening for amino acid disorders using thin layer or paper chromatography and ninhydrine detection. This reveals glutathionuria (up to 1g per day). Decreased activity of gamma glutamyl transpeptidase can be demonstrated in leukocytes or cultured skin fibroblasts, but not in erythrocytes, which lack this enzyme under normal conditions.

No specific treatment has been postulated. The prognosis must be considered as serious if the patients presents with psychiatric or neurologic symptoms. On the other hand, two siblings aged 11 and 13 years so far have no signs of CNS involvement.

Gamma glutamyl transpeptidase deficiency is transmitted by autosomal recessive inheritance.

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Disorders of the Gamma Glutamyl Cycle

2011-01-23T17:37:00.000-08:00

The gamma glutamyl cycle involves six and zymes. The biosynthesis of glutathione is catalyzed by gamma glutamyl cysteine synthetase and glutathione synthetase. The break down of the tripeptide is mediated by four enzymes. The initial step is catalyzed by gamma glutamyl transpeptidase. The gamma glutamyl residue is then released as 5-oxoproline, which is converted to glutamic by 5-oxoprolinase. The biosythesis of glutathione is feedback regulated, i.e., glutathione acts as an inhibitor to gamma glutamyl cysteine synthetase.

Glutathione has been postulated to participate in several fundamental functions, such as free radical scavenging, redox reactions, formation of deoxyribonucleotides, xenobiotic metabolism, and amino acid transport. Patients with genetic defects in the metabolism of glutathione are therefore likely to exhibit a variety of symptoms.

In diagnostic work it is essential to remember that erythrocytes contain an incomplete gamma glutamyl cycle gamma glutamyl transpeptidase, they lack both and 5-oxoprolinase.

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Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

2010-12-04T08:49:00.000-08:00

Kvittingen et al. first described patients with cerebral atrophy and leukodystrophy with N-acetylaspartic aciduria. It was the merit of Matalon et al and divry et al. to link this disorder with Canavan disease.

Clinical Presentation Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

The diagnosis of Canavan disease can be suggested by clinical features including leukodystrophy, megaloencephaly, mental retardation, and optic atrophy. Death usually occurs in the first decade of life. Computed Tomography (CT) scan or magnetic resonance imaging (MRI) show white matter attenuation. Brain histopathology shows spongy degeneration of the myelin, astrocytic swelling, and elongated mitochondria; neurons are normal. Three clinical variants of the disease have been described:

• A congenital form in which the disease is apparent from birth

• An infantile form, which is the most common and which becomes manifest after the first 6 months of life (this form is frequently seen among Jewish patients)

• A juvenile form in which symptoms appear after the first 5 years of life.

Metabolic Derangement Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

The key feature is accumulation of N-acetylaspartic acid in the body fluids, levels in the CSF being much higher than in the serum. The enzymatic defect can be confirmed by assay of aspartoacylase in fibroblasts. Aspartoacylase is also deficient in Brain, liver, and kidney.

N-acetylaspartic acid is abundant in Brain, where its concentration is second only to glutamic acid in the free amino acid pool and is higher than that of GABA Brain is the only organ where biosynthesis of N-acetylaspartic acid has been demonstrated. Its normal function is not well understood. It has been reffered to as an essential component in a series of reactions required for the conversion of lignoceric acid to cerebronic acid, a component of myelin, and the formation of glutamic acid and has been assigned a possible role in neurotransmission and in the production of N-acetylaspartylglutamate. It may also serve as a chemical compartment so that aspartate is released only by the action of aspartoacylase and the released aspartate may be channeled to form arginine.

Diagnostic Tests Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

The diagnosis is based on gas chromatography mass spectrometry (GCMS) of urine or other body fluids showing increased N-acetylaspartic acid levels and is confirmed by aspartoacylase assay on cultured fibroblasts and/or by restriction fragment length polymorphism (RFLP) or mutation analysis of DNA. For prenatal diagnosis the measurement of aspartoacylase in fresh chorionic villi samples or the quantitation of N-acetylaspartic acid in amniotic fluid supernatant are the methods of choice. Obviously, molecular diagnosis using RFLP or mutation analysis within given families will provide prenatal diagnostic facilities and carrier detection in at risk populations in the near future.

Treatment and Prognosis Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

It has been proposed that N-acetylaspartic acid serves as a transporter of acetyl groups from mitochondria to the cytosol for lipogenesis. Therefore, in an attempt to supply alternative substrate for lipogenesis in the brain, a ketogenic diet was given to one patient for 5 months. No improvement was seen. No other treatment is available. Progressive deterioration leads to a decorticate condition and death within a few years.

Genetics Canavan Spongiform Leukodystrophy:Aspartoacylase Deficiency

Genetic transmission is autosomal recessive. The human aspartoacylase gene is localized on chromosome 17 p13-ter. A full-length human cDNA for aspartoacylase has been isolated and a predominant point mutation 856 A>C was identified in Jewish patients.

Monoamine Oxidase-A (MAO-A) Deficiency

2010-12-04T08:36:00.000-08:00

MAO-A has been identified very recently in five generations of a large Dutch kindred.

Clinical Presentation Monoamine Oxidase-A Deficiency

Only males were affected. They showed borderline mental retardation (IQ scores around 85) with prominent behavioral disturbances including aggressive and sometimes violent behavior, arson, attempted rape, and exhibitionism. Aggressive behavior was usually triggered by anger and tended to cluster in periods of 1-3 days. During this time the affected male would experience frequent night terror. Several affected males were reported to suddenly grasp or hold female relatives. All patients displayed a tendency toward stereotyped hand movements such as hand wringing, plucking, or fiddling. Growth and morphology were normal. All of the females functioned normally.

Metabolic Derangement Monoamine Oxidase-A Deficiency

Marked elevations were noted in the MAO substrates such as serotonin, normetanephrine, 3-methoxytyramine, and tyramine in the urine. Levels of the MAO products vanillylmandelic acid, homovanilic, 5-hydroxyindoleacetic acid, and 3-methoxy-4-hydroxyphenylglycol, however, were reduced. As platelet MAO-B activity was found to be normal, these results are consistent with a deficiency of MAO-A, the isozyme found in neural tissue.

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Disorders of Neurotransmitters Diseases Review

Neurological Disease is one of Health Problems

Neurotransmitters and Neuromodulators

Neurotransmitters Disorders of Gamma Glutamyl Transpeptidase Deficiency

Disorders of the Gamma Glutamyl Cycle

Canavan Spongiform Leukodystrophy: Aspartoacylase Deficiency

Monoamine Oxidase-A (MAO-A) Deficiency

Aromatic L-Amino Acid Decarboxylase Deficiency

Dopa-Responsive Dystonia

Succinic Semialdehyde Dehydrogenase (SSDH) Deficiency

Gamma Aminobutyric Acid Transminase Deficiency

Pyridoxine-Responsive and Unresponsive Glutamic Acid Decarboxylase Deficiency

Disorders Of Neurotransmitters Diseases