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Query: UMLS:C0027819 (neuroblastoma)
 27,800 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Phosphorus nuclear magnetic resonance is used to study changes in the levels of the major phosphate-containing intermediary metabolites concomitant with induced cellular differentiation in the N-18 and C-46 neuroblastoma clonal lines. The study reveals differences between the 31P-NMR profiles of the two clonal lines and also striking differences attendant to dibutyryl cAMP-mediated morphological differentiation in the N-18 clone. Phosphorus-31 NMR would appear to provide a new technique with which to study genetic differentiation.
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PMID:Phosphorus 31 NMR of neuroblastoma clonal lines. Effect of cell confluency state and dibutyryl cyclic AMP. 23 46

Biomethylation of metals, including arsenic, apparently occurs as a global process. Health control strategies therefore depend on accurate analysis of arsenic's environmental mobility. Determining to what extent biotransformations occur and how resultant organometal(loids) are sequestered in food chains requires sophistication beyond present-day total element determinations. Rather, active molecular forms of arsenic must be speciated for each environmental compartment, and it is necessary to quantify the dynamics of arsenic's mobility. Thus, new chemical facts are needed yielding rates of methylation or demethylation of arsenic; partition coefficients of organoarsenicals between air, water, and organic phases; and arsenic redox chemistry in polar media. NBS research in this context is reviewed with examples of recent results emphasizing speciation methodology. Topic areas discussed are: the nature of aquated methylarsenic species (NMR and laser-Raman spectroscopy); transport of methylarsenicals from aqueous media (gas chromatography-graphic furnace AA detection applied to metabolic Me3As formation); and speciation of involatile organoarsenicals in aqueous media (demonstration of HPLC utilizing element-specific AA detection and appraisal of electrochemical detectors).
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PMID:Questions concerning environmental mobility of arsenic: needs for a chemical data base and means for speciation of trace organoarsenicals. 90 86

Two tumor cell lines (C6 glioma and N1E-115 neuroblastoma), primary glia and primary neurons (from rat) were incubated with 2-13C-pyruvate and 3-13C-pyruvate in culture dishes. 13C NMR spectra of the cell extracts were used to determine the ratio of pyruvate carboxylase to pyruvate dehydrogenase activity. Pyruvate carboxylase activity was found higher in primary glia cells than in neurons. Glial cells synthesized more amino acids, ie, their TCA cycle was used to a larger extent for biosynthesis than is the case of neurons, where it is preferentially used for the energy metabolism.
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PMID:A 13C NMR study on fluxes into the TCA cycle of neuronal and glial tumor cell lines and primary cells. 133 2

A glycoprotein, M(r) 200,000, which has the biological activity of the neurotoxin-responsive Na+ channel, was isolated from a clonal line of mouse neuroblastoma cells, N-18. The glycoprotein was purified to homogeneity in 18% yield by methods used to purify glycoproteins, which included metabolic labeling of the cells with L-[3H]fucose and binding of the radioactive glycoproteins to WGA- and lentil-Sepharose, and DEAE-cellulose. The glycoprotein has biological activity of neurotoxin-responsive ion flux when reconstituted into artificial phospholipid vesicles. This activity was shown to depend on the presence of sialic acid since treatment of the purified, reconstituted glycoprotein with Vibrio cholerae neuraminidase abolished the response to neurotoxins of 86Rb flux. The [3H]fucose-containing glycopeptides derived by Pronase digestion of the glycoprotein were characterized by affinity to immobilized lectins and contained di-, tri-, and tetra-antennary oligosaccharides in a ratio of 2:4:3. Most of the glycopeptides were sialylated as shown by binding characteristics to immobilized serotonin-Sepharose with and without neuraminidase. The structure of the diantennary oligosaccharides was elucidated by 500-MHz 1H NMR spectroscopy. The Con A-bound fraction contains alpha-NeuNAc-(2-->6)-bound group on the GlcNAc5' antenna and an alpha-NeuNAc-(2-->3)-bound groups on the GlcNAc5 antenna. An alpha-L-fucosyl group is (1-->6)-bound to the Asn core GlcNAc1 residue.
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PMID:Oligosaccharide composition of the neurotoxin-responsive sodium channel of mouse neuroblastoma and requirement of sialic acid for biological activity. 133 66

Clinical and radiological findings in seven cases of olfactory neuroblastoma are reviewed and discussed in the light of the international literature. The report provides further evidence of difficulties related to the predictability of the condition's clinical course, diagnosis, and therapeutic consequences. Moreover, the lack of uniform CCT and NMR features indicates that the discussion about the genesis, the biological action, the terminology, and therapy of these tumors has not yet reached a conclusion.
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PMID:[Olfactory neuroblastoma--tumor entity or complex clinical picture?]. 222 91

This is a report on a dumbbell neuroblastoma with intraspinal extension first noted by 99mTc-HMDP imaging and CT, and confirmed by NMR-CT before the symptoms of spinal cord compression become clear. Paravertebral neuroblastoma and its intraspinal involvement were successfully excised following laminectomy and abdominal surgery without any residual neurologic complications. We report this case to emphasise that NMR-CT was particularly useful to diagnose the extent of intraspinal portion of the tumour, and should be performed in any patient who presents with neuroblastoma adjacent to the vertebral body.
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PMID:Nuclear magnetic resonance computerised tomography (NMR-CT) in early diagnosis of dumbbell neuroblastoma. 273 43

A large-sized glucose polymer was isolated by pronase digestion from line PC12 pheochromocytoma cells metabolically labeled with [1-3H]galactose. The polymer was included on a column of concanavalin A-Sepharose and could be eluted with 10 mM methyl-alpha-mannoside. Its slight retention in a column of Bio-Gel A-5m suggested that its molecular weight was in the several millions. Glucose was the component monosaccharide and there were two minor lipophilic components present. The polymer was digested with alpha-amylase into a series of oligosaccharides and was cleaved by glucoamylase into glucose residues. The disaccharide obtained by digestion with alpha-amylase was identified as maltose in several HPLC systems and by NMR spectroscopy. NMR measurement revealed the trisaccharide to be maltotriose. Susceptibility of the polymer molecule to alpha-amylase, and the digestion products obtained, indicated a resemblance to glycogen. An analysis for saccharide compositions before and after reduction of the polymer suggested the presence of an aglycon part. Contrary to expectations based on the presence of this moiety, the polymer displayed good solubility in neutral organic solvents. Two-thirds of the glucose polymer was also soluble in 10% TCA. A similar glucose polymer was isolated from neuronal cells of rat embryos metabolically labeled with [1-3H]galactose. Mouse neuroblastoma cells did not synthesize the polymer.
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PMID:Characterization of a glucose polymer from PC12 cells and neuronal cells of rat embryo. 314 16

We have been among the first authors to point out that false negative cases could be observed with 131I-MIBG scintigraphy for neuroblastoma. We have observed until now ten of such false negative cases, 7 with primary tumor and 3 with bone metastases. Fifty 131I-MIBG scans were performed in 35 children with histologically proven neuroblastoma (24 grade IV) and compared to bone scans, CT and NMR images, ultrasound and clinical results. The visualization of the primary tumor shows a higher sensitivity with MIBG (79%) than with bone scans (47%) and a 100% specificity with each method. MIBG and bone scans, for bone metastases, are similar in the sensitivity (87.5%) but MIBG is much more specific (100%) than bone scan (81%). These results clearly confirm the superiority of MIBG scan for detection of primary tumor as well as bone metastases. However, MIBG is not always the most appropriate investigation, as shown by 11 observed pitfalls. Ten false negative cases have been observed and must be considered: in five out of 10 cases, bone scans performed with 99m Tc-HMDP made the diagnosis (3/7 cases of primary tumor and 2/3 cases of bone metastases). Moreover, one case was not usable due to a large digestive uptake. Our aim is to understand the reasons of the false negative by a meticulous analysis of every single case. The optimal procedure for neuroblastoma diagnosis, extent and follow up clearly seems to be the following strategy: MIBG scan must be firstly performed; in case of non-demonstrative scan the bone scan, which is complementary, will greatly contribute to the diagnosis.
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PMID:Pitfalls and solutions in neuroblastoma diagnosis using radioiodine MIBG: our experience about 50 cases. 326 25

I 131-metaiodobenzylguanidine (MIBG) is an aralkylguanidine with certain structural similarities to norepinephrine (NE). It is concentrated, stored, and released from chromaffin granules in a manner almost identical with that of NE. It will image the enlarged adrenal medullae of adrenal medullary hyperplasia when the CAT and NMR scans are normal. It is more sensitive in detecting extra-adrenal pheochromocytomas than CAT and NMR imaging. Because 46% of our 176 patients with histopathologically proved "benign" pheochromocytomas (pheos) have developed demonstrable metastases, with or without elevated plasma and urinary catecholamines, we now image all patients with "benign" pheos yearly. As of January 22, 1986 we had treated 28 patients with malignant pheos 71 times with MIBG. As of July 24, 1986, we had given 34 neuroblastoma patients 55 tracer doses. In some cases MIBG demonstrates more neuroblastoma than all other imaging modalities and this is helpful in staging. We have had 30-50% objective regressions in neuroblastoma tumor mass in 3 out of the first 12 patients treated. These three patients had slower-growing tumors and a lower body burden than the nonresponders. We also record the sensitivity of MIBG imaging of neuroendocrine tumors other than pheos and neuroblastomas.
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PMID:Update on basic research and clinical experience with metaiodobenzylguanidine. 330 1

Most NMR contrast agents suggested to date have been paramagnetic. These agents, which include the transition and lanthanide metal ions as well as stable organic free radicals, do not provide effective contrast at concentrations much below 1 mM. However, the use of macromolecular ferromagnetic and superparamagnetic particles provides, for the first time, an NMR relaxation agent that is effective at subnanomolar concentrations. Two different sized superparamagnetic particles have been coupled to monoclonal antibodies with high affinity for a neuroblastoma-specific cell surface antigen. The specific binding of these particles, both in vivo and in vitro is demonstrated and the consequences for immunospecific NMR contrast are discussed.
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PMID:Immunospecific NMR contrast agents. 366 49


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