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  • Nitrate reductase  (10)
  • Schlüsselwörter Knochentumoren  (6)
  • Histopathology  (3)
  • 1
    ISSN: 1432-2307
    Keywords: Myelodysplastic syndrome ; Myelofibrosis ; Cytogenetics ; Histopathology ; Bone marrow biopsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Chromosome analyses of bone marrow and peripheral blood cells were performed in a total of 51 patients with myelodysplastic syndromes (MDS) simultaneously with histopathological examination of resinembedded bone marrow biopsies. Diagnosis of MDS was established by histopathology according to the French-American-British (FAB) classification, and reassessed by haematological data and clinical course. Clonal karyotypic changes were found in 30 of the 51 patients (59%): in 15 of 19 (79%) patients with refractory anaemia, 7 of 11 (64%) with refractory anaemia and excess of blasts (RAEB), 6 of 10 (60%) with RAEB in transformation, and 2 of 11 (18%) with chronic myelomonocytic leukaemia. The following three features of the histopathology revealed positive correlations with karyotype abnormalities: all cases of myelofibrosis in MDS (7/51) were accompanied by chromosome aberrations, microforms of megakaryocytes with reduced nuclear lobulation were observed in 18 of 30 cases with karyotype changes, and hypocellularity of haematopoiesis was associated with aberrations of chromosome 7 in 2 of 4 cases. No positive correlations were revealed between abnormal karyotypes and the transformation to acute leukaemia. The survival times were significantly decreased in patients with complex (3 and more) karyotype changes, when compared with patients with single (1–2) chromosome aberrations or normal karyotype, independently of the FAB classification.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 196 (1995), S. 1-6 
    ISSN: 1432-2048
    Keywords: Acid-base loading ; Nitrate reductase ; pH regulation (intracellular) ; Protein phosphorylation ; Spinacia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of acid or base-loading of spinach (Spinacia oleracea L.) leaf discs on the activation status of nitrate reductase (NR) in the dark and in the light was investigated. Activity of NR (NRA), measured in crude extracts of leaf discs with removed lower epidermis, which had been floating on Mes-buffer [2-(N-morpholino)ethane sulfonic acid] pH 5.2 in the dark, was at a similar low level as in whole, darkened leaves. By addition of acetate or propionic acid, butyric acid or benzoic acid, NR was activated to or beyond the light level. The pH of crude tissue extracts was decreased by 0.5–1 pH units. Tissue acidification caused an inhibition of photosynthesis and of dark CO2 fixation. The acid-induced activation of NR in vivo was largely prevented by okadaic acid, an inhibitor of Type 1 and Type 2A protein phosphatases. This indicates that acid-induced activation was mediated by protein dephosphorylation. When, on the other hand, leaf discs were illuminated on Ches-buffer (2-[ N-cyclohexylamino]ethane sulfonic acid) pH 9 in the presence of bicarbonate (80 mM), their NR was as active as in intact leaves. Addition of ammonium chloride (up to 6 mM) caused a pH increase of the tissue extract up to 0.9 pH units. At the same time NR was inactivated to the dark level. Methionine sulfoximine did not prevent the ammonium effect. Photosynthesis and dark CO2 fixation were stimulated at pH 9 by ammonium chloride (1–2· mol· m −3) and were only slightly inhibited by up to 6 mol· m−3. The modulation of NR by acid-base treatment in vivo was fully reversible. The response of the NR system to acid or base treatment is consistent with a proposed role of nitrate reduction in the cellular pH-stat. The observation also indicates that cytosolic pH changes may be involved the signal chain triggering the modulation of NR.
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  • 3
    ISSN: 1432-2048
    Keywords: Key words: Activation state (nitrate reductase) ; Anoxia ; Hordeum (roots) ; Nitrate reductase ; Protein phosphory-lation ; Protein turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The NADH-dependent nitrate reductase (NR, EC 1.6.6.1) in roots of hydroponically grown barley seedlings was extracted, desalted and the activity measured in buffer containing either Mg2+ (10 mM) or EDTA (5 mM). The former gives the actual NR activity (NRact) equivalent to dephospho-NR, whereas the latter gives the maximum NR capacity of the dephospho-form (NRmax). Both values together permit an estimation of the NR-phosphorylation state. Changes in NRact and NRmax were followed in response to root aeration or to shoot illumination or shoot removal, and were correlated with sugar contents and adenylate levels. Ethanol formation was also measured in roots differing in NR activity in order to obtain information on the relation between anaerobic alcoholic fermentation and nitrate reduction. In aerated roots, NR was highly phosphorylated (about 80%) and largely inactive. It was partly dephosphorylated (activated) by anoxia or by cellular acidification (pH 4.8 plus propionic acid). Anaerobic activation (dephosphorylation) of NR was stronger at acidic external pH (5) than at slightly alkaline pH (8), although ATP levels decreased and AMP levels increased at pH 5 and at pH 8 to the same extent. Thus, rapid changes in the NR-phosphorylation state in response to anaerobiosis were not directly triggered by the adenylate pool, but rather by cytosolic pH. Under prolonged darkness (24 h) or after shoot removal, NRmax decreased slowly without a large change in the phosphorylation state. This decrease of NRmax was correlated with a large decrease in the sugar content, and was prevented by glucose feeding, which had only minor effects on the phosphorylation state. Cycloheximide also prevented the decrease in NRmax without affecting the phosphorylation state. In contrast, anaerobiosis or cellular acidification prevented the decrease of NRmax and at the same time decreased the NR-phosphorylation state. It is suggested that NR turnover in roots is controlled by several factors: NR synthesis appears to depend on sugar availability, which has little effect on the phosphorylation state; in addition, NR degradation appears to be strongly affected by the phosphorylation state in such a way that the inactive phospho-NR is a better substrate for NR degradation than the dephospho-form. The rate of anaerobic ethanol formation was not affected by NR activity, indicating that the purpose of NR activation under hypoxia or anoxia is not to decrease or prevent alcoholic fermentation.
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  • 4
    ISSN: 1432-2048
    Keywords: Key words: Activation state (nitrate reductase) ; Hordeum (nitrate reductase) ; Nitrate reductase ; Nitrate supply ; Phosphate deficiency ; Signal metabolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The relation between nitrate reductase (NR; EC 1.6.6.1) activity, activation state and NR protein in leaves of barley (Hordeum vulgare L.) seedlings was investigated. Maximum NR activity (NRAmax) and NR protein content (Western blotting) were modified by growing plants hydroponically at low (0.3 mM) or high (10 mM) nitrate supply. In addition, plants were kept under short-day (8 h light/16 h dark) or long-day (16 h light/8 h dark) conditions in order to manipulate the concentration of nitrate stored in the leaves during the dark phase, and the concentrations of sugars and amino acids accumulated during the light phase, which are potential signalling compounds. Plants were also grown under phosphate deficiency in order to modify their glucose-6-phosphate content. In high-nitrate/long-day conditions, NRAmax and NR protein were almost constant during the whole light period. Low-nitrate/long-day plants had only about 30% of the NRAmax and NR protein of high-nitrate plants. In low-nitrate/long-day plants, NRAmax and NR protein decreased strongly during the second half of the light phase. The decrease was preceded by a strong decrease in the leaf nitrate content. Short daylength generally led to higher nitrate concentrations in leaves. Under short-day/low-nitrate conditions, NRAmax was slightly higher than under long-day conditions and remained almost constant during the day. This correlated with maintenance of higher nitrate concentrations during the short light period. The NR activation state in the light was very similar in high-nitrate and low-nitrate plants, but dark inactivation was twice as high in the high-nitrate plants. Thus, the low NRAmax in low-nitrate/long-day plants was slightly compensated by a higher activation state of NR. Such a partial compensation of a low NRmax by a higher dark activation state was not observed with phosphate-depleted plants. Total leaf concentrations of sugars, of glutamine and glutamate and of glucose-6-phosphate did not correlate with the NR activation state nor with NRAmax.
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  • 5
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Myelodysplastisches Syndrom ; Knochenmark ; Zytogenetik ; Histopathologie ; Prognose ; Key words Myelodysplastic syndrome ; Bone marrow ; Cytogenetics ; Histopathology ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The value of cytogenetics performed simultaneously with histopathology was evaluated in patients with myelodysplastic syndrome (MDS). Clonal karyotype changes of the bone marrow cells supporting the histological diagnosis were found in 38/69 cases (55 %). The chromosome aberrations, especially complex changes, were significantly correlated to distinct histopathological findings such as atypias of the haematopoietic cell lines and myelosclerosis. Complex karyotype changes were further associated with short survival of the MDS patients. Our results demonstrate that cytogenetic analyses are helpful in supplementing the histopathological diagnoses. Recent developments in molecular cytogenetics even allow the detection of chromosomal aberrations in non-dividing cells from cytological preparations or tissue sections which may become available for routine diagnosis.
    Notes: Zusammenfassung Die Bedeutung simultaner zytogenetischer und histologischer Untersuchungen wurde bei Patienten mit myelodysplastischem Syndrom (MDS) überprüft. Die Ergebnisse zeigen, daß klonale Karyotypveränderungen der Knochenmarkzellen bei 38 der 69 (55 %) analysierten Patienten auftraten und damit häufig eine Absicherung der histologischen Diagnose erlaubten. Die Chromosomenanomalien, insbesondere komplexe Karyotypveränderungen, korrelierten signifikant mit einer Reihe histopathologischer Befunde, darunter Atypien der einzelnen hämatologischen Zellreihen und Myelosklerose. Durch den Nachweis komplexer Karyotypveränderungen war eine unabhängige prognostische Aussage möglich. Damit zeigen unsere Ergebnisse am Beispiel des MDS, daß zytogenetische Analysen eine sinnvolle Ergänzung der histologischen Untersuchung sein können. Darüber hinaus ist durch den Einsatz der molekularen Zytogenetik die Bestimmung von Chromosomenanomalien in zytologischen Ausstrichpräparaten oder Gewebeschnitten möglich, wodurch sich solche Befunde auch für die tägliche Diagnostik verwenden lassen.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 21 (2000), S. 449-455 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Knochentumoren ; Klarzellchondrosarkom ; Histologie ; Differenzialdiagnose ; Keywords Bone tumors ; Clear-cell chondrosarcoma ; Histology ; Differential diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Clear-cell chondrosarcoma is a rare, low-malignant bone tumor. The lesion most commonly occurs in adults, generally in the 3rd or 4th decade. Clear-cell chondrosarcoma has a predilection for the epiphyses of long tubular bones, particularly the femoral head. Radiologically, it is a sharply defined radiolucent lesion. Histologically, it is characterized by large tumor cells with distinct boundaries and a clear cytoplasm. In addition to areas of conventional chondrosarcoma, there are partially mineralized trabecular osteoid formations. On the basis of 16 cases of clear-cell chondrosarcoma, we present the observations of the Hamburg Bone Tumor Register. The cases were examined according to age distribution, location, and radiological and pathomorphological criteria. The proximal femur was the most frequent location; rare manifestations in the rib, os ilium, and distal phalanx of the hand were also present. In 50% of the cases high-malignant osteosarcoma or conventional chondrosarcoma was considered. In addition to the epiphysis of the proximal femur, clear-cell chondrosarcoma can also involve other, rather unusual sites in the skeleton. Knowledge of the histomorphology of this tumor is therefore of crucial importance for the diagnosis.
    Notes: Zusammenfassung Das Klarzellchondrosarkom ist ein seltener niedrigmaligner Knochentumor. Betroffen sind v. a. Patienten in der 3. und 4. Lebensdekade. Bevorzugte Lokalisation sind die Epiphysen langer Röhrenknochen, insbesondere der Femurkopf. Radiologisch imponiert es meist als eine epiphysär gelegene, scharf begrenzte lytische Läsion. Histologisch charakteristisch sind die großen Tumorzellen mit deutlichen Zellgrenzen und einem hellen Zytoplasma. Daneben finden sich auch Areale mit dem histologischen Bild eines konventionellen Chondrosarkoms sowie unterschiedlich breite, z. T. mineralisierte trabekuläre Osteoidformationen. Anhand von 16 Fällen mit Klarzellchondrosarkom werden die Erfahrungen und Beobachtungen des Hamburger Knochentumor-Registers dargestellt. Die Fälle wurden nach Altersverteilung, Lokalisation sowie radiologischen und pathomorphologischen Kriterien untersucht. Das Hauptmanifestationsalter lag innerhalb der 5.–7. Lebensdekade. Das proximale Femur stellte den Hauptlokalisationsort dar. Daneben fanden sich auch eher seltene Manifestationen im Bereich der Rippe, Os ilium und Grundphalanx der Hand. In 50% der Fälle wurde auswärtig zunächst differenzialdiagnostisch ein hochmalignes Osteosarkom oder ein Chondrosarkom diskutiert. Da das Klarzellchondrosarkom außer in der Epiphyse des proximalen Femurs auch an anderen, eher ungewöhnlichen Stellen des Skeletts auftreten kann, ist die Kenntnis der Histomorphologie dieses Tumors von entscheidender Bedeutung für die Diagnosefindung.
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  • 7
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Knochentumoren ; Chondrosarkom ; Osteosarkom ; Zytogenetik ; DNA-Zytometrie ; Ploidie ; Key words Bone neoplasms ; Chondrosarcoma ; Osteosarcoma ; Cytogenetics ; DNA-cytometry ; Ploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 10 chondrosarcomas and 10 osteosarcomas were examined using cytogenetics and DNA-image-cytometry. Cytogenetically 6 of 10 chondrosarcomas and 4 of 10 osteosarcomas showed hyperdiploid tumorcells. By DNA-cytometry in 8 of 10 chondrosarcomas and 9 of 10 osteosarcomas hyperdiploid tumorcells resp. hyperdiploid stemlines were detected. This discrepancy reflects an in-vitro-selection depending on the different entities. In 7 aneuploid clones of chondrosarcomas the chromosomal ploidy was calculated using the relative length of the chromosomes and compared with the DNA-ploidy of the native tumor. There was a close relation between both parameters of nuclear DNA-content. The interpretation of cytogenetic results is improved using a combination of karyotypic and DNA-cytometric examination. This is particularly important for the search for relations between numeric chromosomal aberrations and morphological parameters (grading).
    Notes: Zusammenfassung 10 Chondrosarkome und 10 Osteosarkome wurden tumorzytogenetisch und DNA-zytometrisch untersucht. Das Karyogramm erbrachte bei 6 von 10 Chondrosarkomen und bei 4 von 10 Osteosarkomen den Nachweis hyperdiploider Tumorzellklone. DNA-zytometrisch wurden am nativen Tumormaterial jedoch bei 8 von 10 Chondrosarkomen und bei 9 von 10 Osteosarkomen hyperdiploide Tumorzellen, häufig in Form eigenständiger hyperdiploider Stammlinien nachgewiesen. Diese Diskrepanz ist Ausdruck einer offenbar Entitäts-abhängigen In-vitro-Selektion. Bei insgesamt 7 aneuploiden Tumorzellklonen von Chondrosarkomen konnte die chromosomale Ploidie anhand der relativen Chromosomenlängen exakt errechnet und der zytometrisch bestimmten DNA-Ploidie gegenübergestellt werden, wobei sich eine sehr enge Abhängigkeit zwischen diesen beiden Parametern des nukleären DNA-Gehaltes ergab. Die Interpretation zytogenetischer Befunde bei Knochentumoren wird durch Kombination mit der DNA-Zytometrie verbessert. Dies ist besonders dann wichtig, wenn Zusammenhänge zwischen numerischen chromosomalen Aberrationen und morphologischen Parametern (z. B. Grading) dargestellt werden sollen.
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  • 8
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Chronische myeloproliferative Erkrankungen ; Philadelphia-Translokation ; Zytogenetik ; Molekulargenetik ; Fluoreszenz-in-situ-Hybridisierung ; Histopathologie ; Key words Chronic myeloproliferative disorders ; Philadelphia-translocation ; Cytogenetics ; Molecular genetics ; Fluorescence in situ hybridization ; Histopathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The histopathological classification of chronic myeloproliferative disorders can be supported by applying cytogenetics and molecular genetics to the analysis of bone marrow or blood cells, as demonstrated in 253 cases evaluated. The Philadelphia translocation (9;22) is the most important genetic parameter, being specific for chronic myeloid leukemia. Conventional methods for the detection of the t(9;22) are karyotyping and Southern blot analysis of the bcr gene. The newly established technique of fluorescence in situ hybridization (FISH) allows visualization of bcr-abl fusion even in non dividing cells. Molecular cytogenetics for t(9;22) yield results that are rapid and reliable as well as easily quantifiable.
    Notes: Zusammenfassung Zytogenetische und molekulargenetische Untersuchungen von Knochenmark- oder Blutzellen sind für die histopathologische Klassifikation der chronischen myeloproliferativen Erkrankungen hilfreich, was durch die simultane Auswertung von 253 Fällen gezeigt wird. Insbesondere die Analyse der Philadelphia-Translokation (9;22) ist dabei für die Bestätigung oder den Ausschluß einer chronischen myeloischen Leukämie wichtig. Für den Nachweis der t(9;22) stehen die konventionelle Karyotypisierung mit Bestimmung des Philadelphia-Chromosoms und das Southernblotverfahren zur Analyse einer Umlagerung des bcr-Gens zur Verfügung. Durch die neuere Methode der Fluoreszenz-in-situ-Hybridisierung (FISH) kann auch eine bcr-abl-Fusion an Interphasekernen dargestellt werden. Diese molekulare Zytogenetik ist ein rasches und zuverlässiges Verfahren zum Nachweis der Philadelphia-Translokation, das zudem leicht quantifizierbare Ergebnisse liefert.
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  • 9
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Knochentumoren ; Chondromyxoidfibrom ; Histologie ; Key words Bone tumors ; Chondromyxoid fibroma ; Histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Chondromyxoid fibroma is a rare benign bone tumor, accounting for less than 1% of all bone tumors. The peak age incidence is the second and third decade of life. Chondromyxoid fibrom occurs in the metaphyseal parts of the major tubular bones, predominantly of the lower extremity. Roentgenograms show, in most cases, a well-demarcated radiolucent lesion. The classic histological feature of a chondromyxoid fibroma is stellate or spindle-shaped cells arranged in lobules in a myxoid or chondroid background. Analysis of 40 chondromyxoid fibromas demonstrates the morphological variation of this tumor. Cases were examined for age distribution, localization, and radiological and histological features. In 85% we found the typical histomorphological pattern. Recurrence rate was 12.5%. In four cases the appearance was uncharacteristic and differentiation from other tumors such as chondroblastoma or chondrosarcoma was quite difficult. By adhering to strict histomorphological criteria, definite diagnosis of chondromyxoid fibroma can be made in most cases.
    Notes: Zusammenfassung Das Chondromyxoidfibrom ist ein seltener gutartiger Knochentumor. Seine Häufigkeit beträgt weniger als 1% aller primären Knochentumoren. Das Hauptmanifestationsalter ist die 2. und 3. Lebensdekade. Der Tumor ist überwiegend in der Metaphyse langer Röhrenknochen lokalisiert, insbesondere der unteren Extremität. Radiologisch stellt er in den meisten Fällen eine scharf begrenzte, osteolytische Läsion dar. Histologisch zeigt er einen lobulären Aufbau mit einer chondroiden oder myxoiden Grundmatrix. Die Zellen sind spindelig bis sternförmig. Anhand von 40 Chondromyxoidfibromen soll die morphologische Variationsbreite dieser Tumorentität dargestellt werden. Die Fälle wurden nach Altersverteilung, Lokalisation und radiologischen sowie pathomorphologischen Kriterien untersucht. In 85% der untersuchten Fälle fanden sich die typischen histomorphologischen Kriterien des Chondromyxoidfibroms. Bei 5 Patienten (12,5%) kam es zu einem Rezidiv. 4 Fälle zeigten ein uncharakteristisches Bild und waren nur bedingt von anderen Knochentumoren (Chondroblastom, Chondrosarkom) abzugrenzen. Bei Beachtung strenger histomorphologischer Kriterien aber kann die Diagnose Chondromyxoidfibrom in den meisten Fällen sicher gestellt werden.
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  • 10
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Knochentumoren ; Osteosarkom ; Neoadjuvante Chemotherapie ; Regressionsgrad ; Histologische Typisierung ; Tumorgröße ; Key words Bone neoplasms ; Osteosarcoma ; Neoadjuvant chemotherapy ; Degree of regression ; Histological typing ; Tumor size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 207 osteosarcomas were examined morphologically after neoadjuvant chemotherapy according to the COSS-86 protocol using representative slides of one whole tumor plane. The rate of responders 63 %. In relapse-free patients both the whole tumors and the vital areas there of were smaller than in patients with relapse during a follow-up period of 5 years. Within the subgroup of osteoblastic osteosarcomas, metastases were observed following smaller tumors than in chondroblastic osteosarcomas. Therefore, in addition to degree of regression, histological subtype and tumor size should be considered in the prognostic evaluation of osteosarcomas.
    Notes: Zusammenfassung Im Rahmen der kooperativen Osteosarkomstudie (COSS 86) wurden 207 Resektionspräparate von Osteosarkomen anhand der Auswertung einer Gesamttumorebene zur Bestimmung des Regressionsgrads morphologisch untersucht. Innerhalb der protokollgerecht auswertbaren Fälle betrug das Verhältnis zwischen Respondern und Nonrespondern 63 % : 37 %. Relapse-freie Patienten wiesen zum Zeitpunkt der Resektion einen kleineren Gesamttumor und geringere vitale Tumoranteile auf als Patienten mit einem metastasierenden Verlauf. Bei Berücksichtigung des histologischen Subtyps traten metastasierende Verläufe innerhalb einer Nachbeobachtungszeit von mindestens 5 Jahren in der Gruppe der osteoblastischen Osteosarkome bereits bei einer niedrigeren Gesamttumorgröße auf als bei den chondroblastischen Osteosarkomen. Bei der prognostischen Einschätzung von Osteosarkomen sollten deshalb neben dem Regressionsgrad als Parameter für das Ansprechen auf die Chemotherapie auch der histologische Aufbau und die Gesamttumorgröße Beachtung finden.
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