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  • 1
    ISSN: 1523-5378
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Serological rapid whole-blood tests for the detection of H. pylori are presently being promoted for use in primary care. We conducted a multi-center study to investigate the diagnostic accuracy of the Boehringer Mannheim Helicobacter pylori® test (BM test), which is identical with the Cortecs Helisal® test.〈section xml:id="abs1-2"〉〈title type="main"〉Patients and Methods.A previous diagnosis of H. pylori, a history of peptic ulcer diseases, or proton-pump inhibitor, bismuth or antibiotic use during the preceding month were exclusion criteria. The BM test was performed prior to endoscopy by 7 primary care physicians, 5 practicing gastroenterologists, or a single physician in the university hospital outpatient service. During endoscopy, antral and corpus biopsies were obtained for histology and rapid urease testing (RUT). H. pylori positivity was defined by histology and/or RUT as reference methods. H. pylori IgG-ELISA was performed additionally.〈section xml:id="abs1-3"〉〈title type="main"〉Results.Of the 203 patients included, 151 were H. pylori-positive by reference methods (74.4%). The overall accuracy of the BM test was 77.3%. Eight BM tests were indeterminate, and in the other 195 patients the test performed as follows: sensitivity 80.3%, specificity 81.3%, positive predictive value 92.9%, negative predictive value 57.4%. Using IgG-ELISA as reference, the BM test performance was similar. It also did not differ substantially among the three groups of physicians involved.〈section xml:id="abs1-4"〉〈title type="main"〉Conclusions.We found the performance of the BM test to be insufficiently accurate, as both over- and underdiagnosis of H. pylori infection were not infrequent. This test needs to be improved before its use in primary care can be recommended.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    The @breast journal 4 (1998), S. 0 
    ISSN: 1524-4741
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Activation of ras oncogenes has been described in various human tumors. Additionally there is strong evidence that ras oncogenes are involved in experimental mammary carcinogenesis. The role of these oncogenes in the development of human breast cancer has not yet been fully clarified.We investigated 45 cases of primary human breast cancer for point mutation in the hot spot regions codon 12 and 13 of exon 1 and codon 61 of exon 2 of H-, K-, and N-ras gene, applying polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) technique followed by direct sequencing.One case of an invasive ductal breast cancer showed an activation by point mutation in codon 61, exon 2 of the H-ras gene. We could demonstrate a transversion of adenine to thymine leading to an exchange between glutamine and leucine.Our findings suggest that in spite of experimental carcinogenesis the rate occurrence of ras-oncogene activation by point mutation does not play an important role in human breast cancer.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 21 (1992), S. 117-119 
    ISSN: 1432-2161
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 20 (1991), S. 558-558 
    ISSN: 1432-2161
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 5
    ISSN: 1432-2307
    Schlagwort(e): Key words Amyloid ; Gastrointestinal tuberculosis ; Mycobacterium bovis ; Crohn’s disease
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We report on a 58-year-old Caucasian woman who went to a general practitioner about recurrent abdominal pain, night sweats and weight loss of a few weeks’ duration. Once gynaecological disease had been ruled out, the patient was admitted to hospital with severe abdominal pain and intestinal obstruction and a right-sided hemicolectomy was performed. Following the investigation of osteolytic lumbar vertebrae, 18 months after visiting the general practitioner the patient was finally found to be suffering from generalized AA-amyloidosis secondary to gastrointestinal tuberculosis. This had been misinterpreted as Crohn’s disease. Re-examination of the specimens from the right-sided hemicolectomy demonstrated that scanty deposits of AA-amyloid were present 9 months after the first presentation. AA-amyloid can thus be present in serious inflammatory disease even during the first 9 months after the initial clinical presentation.
    Materialart: Digitale Medien
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  • 6
    ISSN: 0340-1855
    Schlagwort(e): Schlüsselwörter Tiermodell ; Osteoarthrose ; sensible Denervierung ; Capsaicin ; Laufbelastung ; Key words Animal model ; osteoarthritis ; sensible denervation ; capsaicin ; running load
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In the present study we investigated the influence of an altered sensible joint innervation on the development of knee osteoarthritis in a wistar rat model of osteoarthritis. Capsaicin (8-methyl-N-vanillyl-6-noneamide) mediated partial sensible knee joint denervation was performed in a group of 16 male wistar rats. Twelve rats without alterations of the sensible knee joint innervation served as controls. In both groups, halft of the rats underwent strenuous running exercises (total running load of 20km) in a running wheel by intracranial self-stimulation, while the other half did not have any running load. In rats without running, there were no histological sings of knee osteoarthritis according to the Mankin score. In contrast, in rats running a total of 20km significant osteoarthritis changes were observed. Hereby, in rats without altered sensible knee joint innervation, osteoarthritis was mostly classified as mild or moderate, while severe osteoarthritis was the predominant finding in the knee joints of the rats with partial sensible knee joint denervation. In conclusion, our study gives strong evidence for the hypothesis that an altered sensible joint innervation works as a contributing factor in the development of osteoarthritis.
    Notizen: Zusammenfassung In der vorliegenden Studie untersuchten wir den Einfluß gestörter peripherer sensorischer Afferenzen auf die Ausbildung arthrotischer Kniegelenksveränderungen in einem Rattenmodell. Dazu führten wir bei insgesamt 16 männlichen Wistarratten eine sensible Teildenervierung der linken Kniegelenke mittels Capsaicin (8-Methyl-N-vanillyl-6-noneamide) durch, während 12 Ratten ohne gestörte sensible Gelenkinnervation als Kontrollgruppe dienten. Anschließend erfolgte bei jeweils der Hälfte der denervierten und der nichtdenervierten Tiere eine exzessive Laufbelastung (Gesamtlaufleistung 20km) im Laufrad mittels intrakranialer Selbstimmulation. Die verbleibenden Tiere beider Gruppen wurden keiner Laufbelastung unterzogen. Die histologische Beurteilung der Kniegelenke mit Hilfe des Mankin-Scores erbrachte bei den Versuchstieren ohne Laufbelastung, unabhängig davon, ob eine sensible Teildenervierung erfolgt war oder nicht, keinerlei arthrotische Veränderungen. Im Gegensatz dazu zeigten alle Tiere mit 20km Laufbelastung deutliche Gonarthrosezeichen. Während es sich bei den Tieren ohne sensible Teildenervierung fast ausschließlich um leichte bis mäßiggradige Veränderungen handelte, zeigte sich in den Kniegelenken der Tiere mit sensibler Teildenervierung vorzugsweise schwere arthrotische Veränderungen. Insgesamt gibt diese Arbeit deutliche Hinweise auf eine potenzierende Wirkung sensorischer artikulärer Defizite auf die Entwicklung osteoarthrotischer Gelenkveränderungen.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1432-0584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Megakaryocytes from a case of aleukemic megakaryocytic myelosis were examined by electron microscope. They were considerably increased in number and their ultrastructure was different from normal megakaryocytes in certain aspects. Myelinfigures became demonstrable in the cytoplasm in increased number. An effective development of the demarcation membran system could not be observed.
    Notizen: Zusammenfassung Elektronenmikroskopisch erhobene Befunde im Knochenmark bei einem Fall einer klinisch und histologisch gesicherten aleukämischen, megakaryozytären Myelose werden mitgeteilt. Neben der auch lichtmikroskopisch beobachteten Vermehrung von Megakaryozyten im Knochenmark imponieren auf ultrastruktureller Ebene eine deutlich ausgebildeten Demarkationsmembransystems im peripheren Zytoplasma der meisten Megakaryozyten.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 23 (1994), S. 164-164 
    ISSN: 1432-2161
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Journal of cancer research and clinical oncology 124 (1998), S. 165-171 
    ISSN: 1432-1335
    Schlagwort(e): Key words Telomeres ; Soft-tissue tumors ; Telomerase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Purpose: Specific simple DNA repeats occur at the telomeric ends of mammalian chromosomes. Loss of (G+C)-rich repeats can result in genetic instability, associated with tumorigenesis. So far, data on telomere shortening have not been available for different types of soft-tissue tumors. Methods: Using tumor material and the blood of the corresponding patient, high-molecular-mass DNA was prepared by digestion with proteinase K and extraction with phenol/chloroform. A 10-μg sample of DNA was digested with the restriction enzyme HinfI. DNA fragments were separated in a 0.7% agarose gel, and in-gel hybridization was performed with the telomere-specific repeat probe (TTAGGG)3. Results: Shortening of the telomere repeat was observed in 14/30 soft-tissue tumors; 5 tumors showed elongated telomere repeats, whereas the telomeres appeared unchanged in 11 tumors. Decreased telomere repeat length correlated with advanced age, DNA ploidy, and a higher proliferation index. There was no association between telomere repeat length and tumor grade. Interestingly, in contrast to other entities, all malignant schwannomas and leiomyosarcomas showed significantly reduced telomere lengths. An explanation for the telomere heterogeneity in liposarcomas may include differential telomerase reactivation in well and poorly differentiated tumors. Conclusions: Telomere shortening is frequent but not a uniform phenomenon in different types of soft-tissue tumor. Studies on telomerase activity should be performed in the same cohort of sarcomas.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1432-1335
    Schlagwort(e): p53 protein ; Point mutation ; Osteosarcoma ; Bone tumour ; Immunohistochemistry ; Immunoelectron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Alterations of tumour suppressor genes are considered crucial steps in the development of human cancers. Expressions of p53 protein, a product of the tumour suppressor gene altered most commonly in human cancers examined so far, were investigated immunohistochemically in 18 osteosarcomas and 40 other malignant and benign lesions of bone. A monoclonal antibody clone PAb240, which recognizes a common conformational epitope of mutant p53 proteins, stained nuclei of tumour cells in 12 of 18 osteosarcomas (67%). Six tumours (33%) particularly showed positive immunoreactions in more than half of the tumour cells. PAb240 also stained tumour cells in a small number of other malignant bone tumours, such as malignant fibrous histiocytoma, chondrosarcoma, and Ewing's sarcomas. Furthermore, a small number of cells of giant-cell tumours were positively stained. In contrast, PAb240 was completely negative in 21 benign bone tumours and reactive lesions examined. Another monoclonal antibody clone PAb1801, which reacts with both wild- and mutant-type p53 protein, reacted in nuclei of tumour cells of 7 osteosarcomas (39%). Most of those also reacted with PAb240. PAb1801 was expressed much more frequently in other malignant bone tumours and giant-cell tumours. In addition, PAb1801 showed intranuclear positive reactions in tumour cells of a benign chondroblastoma, and reactive cells such as actively proliferating preosteoblasts in a myositis ossificans and osteoclast-like giant cells in a giantcell tumour. The immunoelectron-microscopic observation that p53 protein was localized in euchromatic areas of nuclei of osteosarcoma cells supported the specificity of immunoreaction for p53 protein, indicating an active role of p53 protein in the regulation of DNA synthesis and transcription. These findings suggest that point mutation of the p53 gene is frequently involved in the development of osteosarcomas. PAb240 may be a useful tool not only in screening point mutations of the p53 gene in osteosarcomas but also in the differential diagnosis between osteosarcomas and reactive bone-forming lesions. Expressions of mutant p53 protein were not correlated with any clinical or pathological factors examined, although the results should be confirmed in studies of a large number of osteosarcomas.
    Materialart: Digitale Medien
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