Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

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Query: EC:1.6.5.2 (NQO1)
6,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Neuropeptide Y and somatostatin immunoreactive neurons and processes were examined in human striatum using both immunofluorescence and avidin biotin immunoperoxidase methods. Reduced nicotinamide adenine dinucleotide phosphate diaphorase activity was histochemically determined by the reduction of nitro blue tetrazolium. Immunofluorescence using a monoclonal anti-somatostatin antibody and a polyclonal anti-neuropeptide Y antibody, followed by diaphorase histochemistry, showed that these three neurochemical markers are co-localized in a single population of medium-sized aspiny intrinsic neurons. Cells were evenly distributed in clusters throughout the striatum, but fiber density was higher in the nucleus accumbens and ventromedial regions of the caudate and putamen. Double-stained reduced nicotinamide adenine dinucleotide phosphate diaphorase-acetylcholinesterase sections demonstrated that these neurons are located in zones of high acetylcholinesterase activity, often at the interface of these zones with regions of low enzyme activity. These biochemically distinctive neurons are uniquely situated to modulate activity between striatal compartments. Our findings provide new information about the modular organization of the striatum and extend these observations in human brain.
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PMID:Neuropeptide Y, somatostatin, and reduced nicotinamide adenine dinucleotide phosphate diaphorase in the human striatum: a combined immunocytochemical and enzyme histochemical study. 288 80

The genetic structure of two Chukot Evens subpopulations (314 individuals) for electrophoretic protein systems and taste sensitivity to PTC was studied. 17 of the 39 loci were polymorphic (43.59%). The following systems were completely monomorphic: diaphorase NAD H (Dia); glucose-6-phosphate dehydrogenase (G-6-PD); glutamatoxalate transaminase (GOT); carbonic anhydrase (Ca-1); catalase (Ct), lactate dehydrogenase (loci LDH-A and LDH-B); leucine aminopeptidase (Lap); malate dehydrogenase (MDH); purine nucleoside phosphorylase (PNP); superoxide phosphorylase (PNP); superoxide dismutase (SOD); phosphoglucomutase-2 (PGM2); cholinesterase (locus E1); red cell esterase (4 loci); albumin (Alb); hemoglobin (Hb A and B); ceruloplasmin (Cp); and blood, gren, using the standard method. The following systems were polymorphic: red cell acid phosphatase (AcP); phosphoglucomutase-1 (PGM1); 6-phosphogluconate dehydrogenase (PGD); glutamatepyruvate transaminase (GPT); glyoxalase-1 (GLO-1); esterase (EsD); adenilatkinase (AK); alkaline phosphatase (Pp); cholinesterase (locus E2); haptoglobin (Hp); transferrin (Tf); group-specific component (Gc) and ABO, MN, Lewis, P blood groups and taste sensitivity to PTC. The following allele frequencies for polymorphic loci have been detected: AKI = 0.994; GLO = 1I = 0.082; GPT1 = 0.653; AcPA = 0.400; AcPB = 0.599; AcPC = 0.001; PGDA = 0.944; PGM1(1) = 0.906; EsD1 = 0.897; E2+ = 0.048; HpI = 0.394; GcI = 0,919; Tfc = 0.987; r(O) = 0.669; p(A) = 0.184; q(B) = 0.146; M = 0.711; Le = 0.411; P1+ = 0.521; t = 0.295. The genetic structure of Chukot Evens population is significantly nearer to that of the other ethnic groups of the North-East, in comparison with the genetic structure of Evenks of the Middle Siberia.
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PMID:[Genetic structure of the populations of native inhabitants in the northeastern USSR. V. The Chukot Evens]. 293 99

We have previously found that a biochemically distinct subset of neurons, containing nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d), is selectively resistant to the degenerative process that affects the striatum in Huntington's disease (HD). We report the morphologic and histochemical characteristics of these striatal neurons and their distribution with respect to the histochemical compartments as defined by acetylcholinesterase (AChE) activity. Sections of striatum were stained histochemically for NADPH-d and AChE and immunocytochemically for somatostatin and neuropeptide Y-like immunoreactivity. The diaphorase end-product was contained within medium-sized neurons which corresponded morphologically to a category of aspiny interneurons. Combined techniques showed that NADPH-d, somatostatin, and neuropeptide Y coexisted within the same neurons in controls and patients with HD. The density of these neurons was greater in the ventral putamen and the nucleus accumbens than in the remainder of the striatum. The distinctive AChE pattern of high and low enzyme activity was altered in HD. The AChE-rich matrix zone was markedly reduced in size, while the total area of zones of low enzyme activity was not different from that found in control striatum. The relation between these AChE chemical compartments and the distribution of preserved diaphorase neurons remained intact; NADPH-d neurons were predominantly observed in the matrix zone.
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PMID:Morphologic and histochemical characteristics of a spared subset of striatal neurons in Huntington's disease. 294 77

A combination of immunocytochemical and enzyme histochemical methods have been used to study those neurons which survive lesions of the rat striatum, produced by low doses of the excitotoxin quinolinic acid. Nissl-stained sections revealed that following injection of this toxin many large neurons remained within areas of extensive cell loss. These large cells were found to express both the enzyme acetylcholinesterase and choline acetyltransferase-like immunoreactivity. The surviving cells did not contain the enzyme reduced nicotinamide adenine dinucleotide phosphate or the peptides, somatostatin and neuropeptide Y. This pattern of selective cell sparing was also found following lesions induced by low doses of the toxins ibotenic acid and kainic acid. The survival of large neurons indicates that the excitotoxin-lesioned rat striatum shares common features with the pattern of cell loss found in the caudate-putamen in Huntington's disease. The major difference between these two examples of striatal nerve cell degeneration is, however, the selective preservation of somatostatin/neuropeptide Y/nicotinamide adenine dinucleotide phosphate-diaphorase-containing neurons found in Huntington's disease but not observed following quinolinic acid lesions.
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PMID:Sparing of cholinergic neurons following quinolinic acid lesions of the rat striatum. 297 92

A significant increase in the striatal specific activity of DT diaphorase is demonstrable from one to six weeks after intrastriatal injection of kainic acid (KA). At six weeks, there is a significant dose-response relation (ANOVA, F(2,18) = 25.8, p less than 0.001); 1, 3 and 5 nmoles produce 12.3, 39.6 and 118% increases, respectively. Loss of acetylcholinesterase activity (AChE), used as an indicator of neuronal damage, is positively correlated with the enhanced DT diaphorase activity (r = 0.823, p less than 0.01).
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PMID:Kainic acid induced damage to the striatum increases DT diaphorase activity. 311 25

Nicotinamide adenine dinucleotide phosphate diaphorase reactive neurons were found in several regions of human brainstem. Three major groups were located in the medulla: a dorsomedial group in the central gray and floor of the fourth ventricle, a ventromedial group in the vicinity of the medullary raphe, and a lateral group in the lateral reticular nucleus. In the upper pons a large cluster of reactive neurons was centered in the nucleus centralis oralis extending into the locus coeruleus and dorsal tegmental region. A second cluster in the lateral parabrachial nucleus merged with this group more rostrally and continued into the midbrain tegmentum (paracoeruleus-cuneiform group). Nicotinamide adenine dinucleotide phosphate diaphorase neurons in this region often contained acetylcholinesterase activity. A second midbrain group was seen in the nucleus paranigralis. Aside from these discrete neuronal collections, scattered reactive neurons were found in the medullary reticular formation, periaqueductal gray, inferior colliculus and superior colliculus. Nicotinamide adenine dinucleotide phosphate diaphorase neurons were classified into three groups based on somal size. Parvocellular neurons (10-20 micron) were primarily found in the ventromedial medulla and lateral parabrachial nucleus. Intermediate neurons (20-25 micron) were located in the paranigralis nucleus and dorsomedial medulla. Magnocellular neurons (25-35 micron) were characteristically found in the lateral reticular nucleus and paracoeruleus-cuneiform region. Nicotinamide adenine dinucleotide phosphate diaphorase reactive neurons are present in substantial numbers in human brainstem and their distribution is complex. They represent the caudal end of a widespread network of nicotinamide adenine dinucleotide phosphate diaphorase-enriched neurons that extend rostrally from the brainstem reticular formation into the basal forebrain, striatum, and cerebral cortex.
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PMID:Morphology and distribution of nicotinamide adenine dinucleotide phosphate (reduced form) diaphorase reactive neurons in human brainstem. 317 92

Fetal cortex from 16- and 17-day-old embryonic rats was transplanted into the parietal cortex of 12 adult rats rendered ischemic by temporary intraluminal occlusion of the middle cerebral artery. Ischemic injury in the host cortex adjacent to all nine surviving transplants was demonstrated with hematoxylin and eosin and cresyl violet strains. Nicotidamide adenine dinucleotide phosphate-diaphorase (NADPH-d) histochemical studies revealed a normal number of NADPH-d-positive neurons, whereas acetylcholinesterase (AChE) staining revealed many more AChE-positive neurons in the transplants compared to the host parietal cortex. This could be due to: 1) selective survival of AChE neurons in the transplants compared to the host cortex; 2) increased expression of AChE in transplanted neurons; 3) induction of AChE in normally AChE-negative neurons; or 4) decreased transport of the AChE enzyme from the perikarya to fibers in surviving transplanted neurons. Many fibers positive for AChE and NADPH-d crossed between the host and transplant, although fiber density in the transplants was less than in normal host cortex. These results should encourage future investigation of whether similar transplants improve neurological function following experimental stroke.
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PMID:Neuronal changes in fetal cortex transplanted to ischemic adult rat cortex. 319 96

The cholinergic neurons located within the pedunculopontine nucleus (Ch5) of patients with Alzheimer's disease (AD; n = 15), Parkinson's disease (PD; n = 2), and neurologically normal (n = 6) subjects were visualized immunohistochemically using choline acetyltransferase, pharmacohistochemically using acetylcholinesterase, or by reduced histochemical methods using nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d). Each histochemical procedure localized a well-delineated, compact lateral group and a more diffuse medial group of neurons within the pedunculopontine nucleus. Co-localization experiments revealed that all three enzymes marked the same population of cholinergic neurons. The extent of pathological alterations associated with the cholinergic neurons within the compact lateral sector of the pedunculopontine nucleus was examined in sections that reacted for NADPH-d, counterstained with thioflavin-S. The average number of neurofibrillary tangles within this portion of the pedunculopontine nucleus was 25.4 (range 0-70) in patients with AD, 1.5 (range 1-2) in those with PD, and 1.2 (range 0-4) in aged control subjects. Of the total number of neurofibrillary tangles counted in AD cases, 72.7% were end-stage ghosts and 27.3% were tangle-bearing neurons. The pathological alteration of cholinergic neurons of the compact lateral aspect of the pedunculopontine nucleus may play a role in some of the behavioral features characteristic of AD.
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PMID:Neurofibrillary tangles in cholinergic pedunculopontine neurons in Alzheimer's disease. 320 15

The substantia innominata encompasses an area of the basal forebrain that is ventral to the lenticular nucleus and anterior commissure, medial to the claustrum and external capsule, and lateral to the hypothalamus. The nucleus basalis of Meynert consists primarily of large acetylcholinesterase (AchE)-positive neurons embedded within the substantia innominata. Damage to these neurons may be important in the pathogenesis of cortical dysfunction in Alzheimer's disease. In order to characterize other neuronal elements in the substantia innominata and their relationship to the nucleus basalis, we chose to study a biochemically distinct neuronal subset containing the enzyme nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d). The substantia innominata was blocked from six normal brains obtained postmortem and fixed in neutral-buffered formalin at 4 degrees C for 48 hours. Free-floating 50-micron sections from several levels were stained for NADPH-d or AchE activities. Selected sections were double stained for NADPH-d and AchE. NADPH-d activity was present in a network of pleomorphic neurons that extended through all levels of the substantia innominata and into the striatum and amygdala. NADPH-d neurons were particularly numerous at the level of the anterior commisure and were closely associated with the cholinergic neurons of the nucleus basalis. They were not seen in the ventral pallidum, or the vertical limb of the diagonal band of Broca or in the islands of Calleja. The cell bodies of NADPH-d neurons were quite varied in shape, ranging from ovoid to fusiform, and about half the cells were bipolar. Where neuronal density was high, their dendrites formed an interlacing pattern. NADPH-d-positive fibres were seen coursing through the external capsule, hypothalamus, and amygdala. This novel set of neurons in the substantia innominata may be part of a more extensive network that interacts with the magnocellular basal forebrain system at the level of the nucleus basalis. Whether other neurotransmitters are present within these neurons and whether NADPH-d neurons are involved in Alzheimer's disease remain to be elucidated.
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PMID:Subset of neurons characterized by the presence of NADPH-diaphorase in human substantia innominata. 361 5

In the intermediate layers of the rat and mouse colliculus there is a lattice-like pattern of high nicotinamide adenine dinucleotide phosphate diaphorase activity. This lattice is composed of dark bands that are 100-200 micron wide and enclose pale areas of irregular shape. A very similar lattice of high acetylcholinesterase activity is also found in the intermediate layers and this overlaps the diaphorase lattice almost completely. However, in deeper layers the enzymes have a complementary organization with high levels of one being associated with low levels of the other. It is concluded that the histochemical lattices will provide useful patterns with which to compare the terminal organization of afferent systems.
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PMID:Spatial relationship of NADPH-diaphorase and acetylcholinesterase lattices in the rat and mouse superior colliculus. 377 47


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