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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 404 (1984), S. 187-196 
    ISSN: 1432-2307
    Schlagwort(e): Immunoelectron microscopy ; Protein A-gold-technique ; Biotin-avidin system ; Amylase ; Parotid gland
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Specimens of the human parotid gland were studied by immuno-electron microscopy for the presence of amylase. Both the protein A-gold technique and the biotin-avidin-gold technique were used on the same specimens. Different fixations were tried. Amylase was detected in the zymogen granules in high amounts. This enzyme could even be seen in glutaraldehyde fixed and routinely embedded material. The subcellular localization of this enzyme opens a new field of functional morphological studies and studies in special tumours including acinic cell carcinomas.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    International journal of colorectal disease 14 (1999), S. 41-46 
    ISSN: 1432-1262
    Schlagwort(e): Key words Inflammatory bowel disease ; Permeability ; Transepithelial transport ; Immunoelectron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Crohn's disease (CD) and ulcerative colitis (UC) are inflammatory bowel diseases (IBD) of unknown etiology. Oral absorption studies have shown an increased intestinal permeability for various sugar molecules in patients with IBD and their healthy relatives as a possible pathogenetic factor. However, the various transport pathways through the mucosal barrier have not yet been examined. This study therefore investigated whether antigens pass the epithelial barrier by a transcellular or a paracellular pathway. Mucosa of freshly resected specimens from CD (n = 10) or UC (n = 10) patients was investigated by immunoelectron microscopy and compared with healthy mucosa. Epithelial transport was studied with the antigens ovalbumin and horseradish peroxidase after defined incubation. Labeling density of subunit c of ATP synthetase was determined in mitochondria of enterocytes of all specimens. In all specimens epithelial transport of OVA and HRP was principally transcellular through enterocytes with normal ultrastructure, although some tight junctions in CD and UC were dilated. Antigens were transported within vesicles to the basolateral membrane 2.5 min after incubation. The level of enterocytes with electron-lucent cytoplasm containing a high amount of antigens was higher in CD and UC than in healthy mucosa, depending on the grade of inflammation. ATP synthetase was significantly decreased in electron-lucent cytoplasm of CD and UC to normal ultrastructure of healthy mucosa. Our study shows that ovalbumin and horseradish peroxidase taken up by the apical membrane reach the paracellular space by vesicular transport in healthy and IBD enterocytes within a few minutes. Transcellular pathway is affected in both CD and UC, which is indicated by a high level of antigens within the cytosol. We speculate that increased intestinal permeability in IBD results substantially from enhanced transcellular transport.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Monatsschrift Kinderheilkunde 147 (1999), S. 279-282 
    ISSN: 1433-0474
    Schlagwort(e): Schlüsselwörter Systemische Sklerodermie ; Morbus Sharp ; 24-h-pH-Metrie ; Gastroösophagealer Reflux ; Key words Systemic scleroderma ; Mixed connective tissue disease ; 24-hours pH-metry ; Gastro-esophageal reflux
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Objectives: Esophageal motility disorders and gastroesophageal refluxes are the most frequent gastrointestinal manifestations of progressive systemic sclerosis and Morbus Sharp (”mixed connective tissue disease”). The prognosis of the internal involvements of this uncommon disorders in childhood and adolescence is not well known. Methods: Four patients with systemic sclerosis and two with Morbus Sharp were investigated with two times ambulatory 24-hour esophageal pH-metry for existence and/or degeree of gastro-esophageal reflux. The interval between the two investigations averaged 13,5 months. During this time, none of the patients had symptoms and therefore no H2-antagonists or prokinetic drugs. Results: At both examinations 3/6 patients had an increased percentage of pH〈4. One patient developed retrosternal pain before the second examination. Three patients had an increase of their reflux index. We documented an increase of reflux events lasting for more than 5 min; this result documents a decrease of the esophageal clearance function. Conclusion: In patients with systemic scleroderma or Morbus Sharp a lack of symptoms does not exclude gastroesophageal involvement. In the course of the diseases some of the patients develope a deterioration of the esophageal motility, inspite of immunosuppresive or antiinflammatory therapy. Further studies have to prove the effects of a pre-symptomatic treatment with H2-antagonists or prokinetic drugs on the prognosis of esophageal involvement in systemic scleroderma or Morbus Sharp during childhood.
    Notizen: Zusammenfassung Fragestellung:Ösophagusmotilitätsstörungen und gastroösophagealer Reflux sind die häufigsten gastrointestinalen Manifestationen der systemischen Sklerodermie und des Morbus Sharp (mixed connective tissue disease). Über den Spontanverlauf dieser internen Organmanifestationen liegen für das Kindes- und Jugendalter keine Daten vor. Wir untersuchten diese Fragestellung bei pädiatrischen Patienten, die an dieser im Kindesalter seltenen Erkrankung litten, im Rahmen der klinischen Verlaufskontrollen. Patienten und Methode: Es wurden bei 4 Patienten mit systemischer Sklerodermie und 2 Patienten mit Morbus Sharp in 2 24-h-pH-Metrien das Vorliegen und das Ausmaß eines gastroösophagealen Refluxes gemessen. Der durchschnittliche Zeitabstand betrug 13,5 Monate. Während des Beobachtungsintervalls erhielten die Patienten aufgrund fehlender klinischer Symptome keine Säureblocker oder Prokinetika. Ergebnisse: Bei 3/6 Patienten wurde zu beiden Meßzeitpunkten ein erhöhter Refluxindex nachgewiesen. Während nur 1 Patient im Beobachtungszeitraum bis zum Zeitpunkt der Wiedervorstellung und Zweitmessung ein Sodbrennen entwickelte, konnte bei 3 Patienten eine z.T. deutliche Zunahme des gastroösophagealen Refluxes dokumentiert werden. Dabei fand sich insbesondere eine Zunahme der längeren Refluxereignisse als Hinweis auf eine gestörte Clearance-Funktion des distalen Ösophagus. Schlußfolgerung: Das Fehlen klinischer Symptome schließt eine gastroösophageale Beteiligung bei pädiatrischen Patienten mit Sklerodermie und Morbus Sharp nicht aus. Im Spontanverlauf kommt es bei einem Teil der Patienten trotz immunsupressiver und antientzündlicher Therapie der rheumatologischen Grunderkrankung zu einer Progredienz der Ösophagusmotilitätsstörung. Es ist in weiteren Studien zu prüfen, ob eine frühzeitige Therapie mit Prokinetika und H2-Rezeptor-Antagonisten sich im Kindes- und Jugendalter vorteilhaft auf die ösophagealen Komplikationen der systemischen Sklerodermie und des Morbus Sharp auswirkt.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  While autoantibodies against thyroid peroxidase (TPO) are known to produce cytotoxicity in vitro, their in vivo effects are still obscure. In addition, the mechanism of TPO autoantibody creation needs to be disclosed because the localization of TPO on thyrocytes is considered to be restricted to the apical membrane, which is not in contact with immunocompetent cells. In order to study these crucial processes in the pathogenesis of thyroid autoimmunity, the ultrastructural localization of TPO and IgG was determined and quantified in thyrocytes of normal thyroid gland and thyroid tissue of patients suffering from Graves’ disease. This was done by using ultrathin frozen sections and the immunogold method. IgGs were detected in the follicular lumen, close to the apical membrane, in transport vesicles, the endoplasmic reticulum, and the Golgi apparatus of thyrocytes from patients with Graves’ disease. The labeling of TPO in the basolateral membrane was distinctly lower than that of the apical membrane, but was significant in comparison to the plasma membrane labeling of fibroblasts present in the same sections. These data indicate that thyroid autoantibodies may perform their cytotoxic function in intracellular compartments besides the plasma membrane. TPO molecules on the basolateral membrane of HLA class II antigen-positive thyrocytes may initiate antigen presentation of TPO as well as the formation and uptake of TPO autoantibodies.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1573-2665
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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