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排序方式: 共有203条查询结果,搜索用时 31 毫秒
31.
J. Mühling M. G. Dehne M. Fuchs A. Sablotzki S. Weiss J. Spatz G. Hempelmann 《Amino acids》2001,21(3):303-318
Summary. Currently we know not more than 50 patients who show an interesting combination of increased plasma ornithine concentrations,
postprandial hyperammonemia, and homocitrullinuria (HHH-syndrome). Since exact knowledge of this severe, although rare syndrome
is important for any perioperative or intensive medical treatment concerning therapy and progression of the disease, we report
a comprehensive study on a 32-year old woman with this rare multifaceted disorder who had to undergo general anaesthesia.
For the first time amino acid status in plasma, urine, cerebrospinal fluid and especially polymorphonuclear leucocytes, which
in the investigation showed to be valuable tool for evaluating amino acid metabolism in nucleated cells in HHH-syndrome, and
further important pathophysiologic indicators of cellular and metabolic function have been conscientiously investigated and
compared. The pathophysiological repercussions of our results as well as the recommendations for conscientious therapeutical
management are discussed.
Received September 9, 1999 Accepted July 1, 2000 相似文献
32.
Danica B. Stanimirovic M.D. Marina Markovic Dejan V. Micic Maria Spatz Bogomir B. Mrsulja 《Neurochemical research》1994,19(12):1473-1478
Bilateral common carotid artery occlusion (15 min.) followed by two hours of recirculation reduced mitochondrial superoxide dismutase (SOD) and glutathione reductase (GR) activities, and increased susceptibility of mitochondrial membranes to in vitro lipid peroxidation in brain regions (i.e., cortex, striatum and hippocampus) of Mongolian gerbil. Intraperitoneal bolus injection (2 mg/kg b.w.) of liposome-entrapped CuZn superoxide dismutase (l-SOD) increased the endogenous SOD activity in normal brain tissue and, when given at the end of ischemia, counteracted both the ischemic reduction of endogenous SOD and the increased peroxidation of mitochondrial membranes. 1-SOD treatment was ineffective in reducing brain swelling, suggesting that superoxide radicals are not a main participant in the process of (post)ischemic brain edema formation. 相似文献
33.
We report the cases of two patients with head and neck Merkel cell carcinoma (MCC) who developed local recurrences confirmed by cytopathology. Interphase fluorescent in situ hybridization (FISH) analysis was performed for research purposes using centromeric probes of chromosomes 6 and 8, on cytological slides. Trisomy of chromosome 6 was found in 85% of tumour cells in the first case of MCC and case 2 exhibited trisomy 8 in 77% of tumour cells. In the absence of specific molecular markers, detection of trisomy 6 and/or trisomy 8 could help in identifying MCC. FISH analysis is easily and quickly performed on interphase nuclei obtained through fine needle aspiration and may be extended to the study of other relevant genetic abnormalities. 相似文献
34.
This report describes K+ efflux, K+ and Ca2+ uptake responses to endothelins (ET-1 and ET-3) in cultured endothelium derived from capillaries of human brain (HBEC). ET-1 dose dependently increased K+ efflux, K+ and Ca2+ uptake in these cells. ET-1 stimulated K+ efflux occurred prior to that of K+ uptake. ET-3 was ineffective. The main contributor to the ET-1 induced K+ uptake was ouabain but not bumetanide-sensitive (Na+-K+-ATPase and Na+-K+-Cl– cotransport activity, respectively). All tested paradigms of ET-1 effects in HBEC were inhibited by selective antagonist of ETA but not ETB receptors and inhibitors of phospholipase C and receptor-operated Ca2+ channels. Activation of protein kinase C (PKC) decreased whereas inhibition of PKC increased the ET-1 stimulated K+ efflux, K+ and Ca2+ uptake in HBEC. The results indicate that ET-1 affects the HBEC ionic transport systems through activation of ETA receptors linked to PLC and modulated by intracellular Ca2+ mobilization and PKC. 相似文献
35.
Mechanical Properties of the Rhizome of Arundo donax L. 总被引:2,自引:0,他引:2
Abstract: The mechanical properties of rhizome segments of Arundo donax L. were studied in three dimensions: longitudinal (X), transverse-vertical (Y), transverse-horizontal (Z). Tensile, cyclic loading and torsional tests demonstrate that the distinct anisotropy found in the hollow stems is less pronounced in the rhizome. Morphological and anatomical examinations suggest that the mechanical anisotropy of the stem is caused by the arrangement parallel to the stem of the vascular bundles and sclerenchymatous fibres, embedded in lignified parenchyma. Anatomical inhomogeneity is less pronounced in the rhizome due to the short internode lengths, and predominance of nodal regions, where sclerenchymatous fibres form a complex three-dimensional arrangement embedded in unlignified starch-storing parenchyma. Cyclic loading experiments indicate viscoelastic behaviour of the rhizomatous tissues under tensile stress. Additionally, viscoelastic behaviour under torsional stress was studied. Mechanical behaviour of the rhizome under tension up to fracture is discussed with regard to the fracture surfaces, analysed by SEM. 相似文献
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39.
Yanwen Jiang David Redmond Kui Nie Ken W Eng Thomas Clozel Peter Martin Leonard HC Tan Ari M Melnick Wayne Tam Olivier Elemento 《Genome biology》2014,15(8)
Background
Molecular mechanisms associated with frequent relapse of diffuse large B-cell lymphoma (DLBCL) are poorly defined. It is especially unclear how primary tumor clonal heterogeneity contributes to relapse. Here, we explore unique features of B-cell lymphomas - VDJ recombination and somatic hypermutation - to address this question.Results
We performed high-throughput sequencing of rearranged VDJ junctions in 14 pairs of matched diagnosis-relapse tumors, among which 7 pairs were further characterized by exome sequencing. We identify two distinctive modes of clonal evolution of DLBCL relapse: an early-divergent mode in which clonally related diagnosis and relapse tumors diverged early and developed in parallel; and a late-divergent mode in which relapse tumors developed directly from diagnosis tumors with minor divergence. By examining mutation patterns in the context of phylogenetic information provided by VDJ junctions, we identified mutations in epigenetic modifiers such as KMT2D as potential early driving events in lymphomagenesis and immune escape alterations as relapse-associated events.Conclusions
Altogether, our study for the first time provides important evidence that DLBCL relapse may result from multiple, distinct tumor evolutionary mechanisms, providing rationale for therapies for each mechanism. Moreover, this study highlights the urgent need to understand the driving roles of epigenetic modifier mutations in lymphomagenesis, and immune surveillance factor genetic lesions in relapse.Electronic supplementary material
The online version of this article (doi:10.1186/s13059-014-0432-0) contains supplementary material, which is available to authorized users. 相似文献40.
Modulation of glycogen metabolism in cerebromicrovascular smooth muscle and endothelial cultures 总被引:3,自引:0,他引:3
M Spatz B B Mrsulja B Wroblewska N Merkel J Bembry 《Biochemical and biophysical research communications》1986,134(2):484-491
The separately cultured smooth muscle and endothelial cells derived from dissociated cerebral microvessels are characterized by high content of glycogen. Norepinephrine induces glycogenolysis while 5-hydroxytryptamine stimulates glycogenesis in both cell types. The endogenous glucose of the endothelium but not that of the smooth muscle serves as a direct source for the 5-HT enhancement of glycogen formation. Indomethacin, the known inhibitor of cyclooxygenase modulates the glycogen content in the smooth muscle only. These findings strongly suggest that the carbohydrate metabolism of each cell has a distinct control mechanism compatible with the underlying integral microvascular function. 相似文献