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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 388 (1980), S. 137-154 
    ISSN: 1432-2307
    Schlagwort(e): Streptozotocin diabetes ; Islet transplantation ; Diabetic glomerular lesions ; Morphometry ; Mesangium ; Blood glucose ; Immunocomplexes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Glomerular changes develop in rats with streptozotocin diabetes. The structure of these lesions (nodular and diffuse glomerulosclerosis, mesangial cell proliferation, basement membrane thickening, glomerular aneurysms, fibrinoid caps, glomerular adhesions) is described in the present paper and the effect of normalization of metabolism by islet transplantation on the glomerular changes is studied with histological, immunohistological and morphometric methods. Isogenous islets were transplanted into the portal vein of streptozotocin-diabetic rats after diabetes of 7 months' duration. The kidneys of normal, diabetic and transplanted animals of the same age were studied 2.5 months later. Studies of the kinetics of immunocomplexes in the mesangium were also performed. The renal changes (glomerulosclerosis, mesangial cell proliferation) were largely reversible after islet transplantation and the blood glucose level and glucose tolerance were normalized. In the diabetic animals the delayed uptake and elimination of immunocomplexes in the mesangium was normalized after the transplantation. It is possible, that the cause of the lesions is a functional disturbance of the mesangium induced by insulin deficiency and/or hyperglycaemia.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 389 (1980), S. 211-223 
    ISSN: 1432-2307
    Schlagwort(e): Glomerular structure ; Morphometry ; Monocomponent insulin ; Antibody formation ; Mesangium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Weak nonspecific immunological stimuli can irritate the glomerular mesangium as observed following administration of insulin preparations of varying degrees of purity. In the present study further substances were investigated with regard to this effect. We wished to examine which substances obtained during purification of insulin are mainly responsible for the antigenicity, and whether porcine and bovine MC insulin have the same antigenic properties. Rabbits were treated for up to 90 days with bovine MC insulin, bovine proinsulin, bovine a + b-component, porcine a-component and porcine b-component. The kidneys were analysed morphometrically and antibody titers to bovine insulin, a-component, porcine PP and proinsulin were determined in the various test groups. It was found that bovine MC insulin and porcine MC insulin possess the same immunological activity, i.e. no antibody formation to either of the two insulins was demonstrable. Similarly, there were no differences in the morphometric findings; slight transient mesangial changes were demonstrable after both insulins. However a-component and b-component showed a pronounced immunogenic potency with antibody formation. Marked and partly persisting mesangial alterations were demonstrable, with the antigenicity of the a-component being particularly marked. The implication of the study is that a “pure” or optimally purified insulin should be used in the therapy of diabetes mellitus.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1432-2307
    Schlagwort(e): Insulin ; Antibody ; Glomerulus ; Mesangium ; Quantitative morphology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Thirty rabbits were immunized with MC insulin and high-molecular impurities of commercial insulin preparations (a+b component) over 30, 60 and 90 days. The serum insulin antibody titer was determined in animals as the insulin binding capacity. Further, a quantitative morphological analysis of the various types of glomerular cells and of the mesangium was performed on the glomeruli as a blind study. Significant mesangial cell proliferation and an increase in mesangial matrix were found on treatment with the a+b component whereas the animals treated with MC insulin exhibited only a transient and slight mesangial activation after 30 days. There was a positive correlation between the magnitude of the insulin binding capacity and the mesangial activation. Hence, the glomerular changes which are observed after treatment with insulin which is not highly purified must be attributed to the high molecular weight contaminants. Heterologous pure insulin must be regarded as having virtually no immunological effect.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 166 (1975), S. 265-273 
    ISSN: 1433-8580
    Schlagwort(e): Glomerulus ; mesangium ; immunosuppressive therapy ; glomerulonephritis ; Glomerulus ; Mesangium ; Immunosuppressive Therapie ; Glomerulonephritis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Eine dreimonatige Behandlung von 10 glomerulonephritischen und 10 normalen Meerschweinchen sowie 10 Ratten mit Imurek (20 mg/kg/Tag) ergab: 1. Das morphologische Substrat der Glomerulonephritis war auch nach 3 Monaten noch deutlich nachweisbar. 2. Bei Meerschweinchen und Ratten waren überwiegend glomeruläre Veränderungen nachzuweisen, die in einer Mesangiumaktivierung, herdförmigen glomerulären Nekrosen und Ablagerung eines amorphen scholligen Materials im Mesangium bestanden. 3. Bei einigen Tieren konnten aus Nierenvenenblut und von der Nierenschnittfläche Streptokokken und Staphylokokken gezüchtet werden. Die Untersuchungen zeigen, daß bei der Therapie von Glomerulonephritiden mit Immunsuppressiva nicht immer morphologische Besserungen zu erwarten sind. Eventuelle Verschlechterungen des morphologischen Bildes könnten ihre Ursache durchaus in einer direkten Wirkung des Immunsuppressivum auf die Nierenstruktur haben.
    Notizen: Summary Results of three months' treatment of 10 glomerulonephritic, 10 normal guinea pigs and of 10 normal rats with imurek (20 mg/kg/day) were as follows: 1. The morphological picture of glomerulonephritis was demonstrable even three months after treatment with imurek. 2. Predominant glomerular changes were demonstrated in both of guinea pigs and rats after treatment with imurek. These changes consisted of mesangial activation, focal glomerular necrosis and deposits of an amorphous clumped material in the mesangium. 3. In some animals, streptococci and staphylococci could be cultivated from the blood of the vena renalis and from the renal surface. The results of the present study indicates that treatment of glomerulonephritis with immunosuppressiva is not always effective. It is probable that morphological deteriorations may be caused by a direct effect of the immunosuppressiva on the renal structure.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 20 (1985), S. 407-416 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography-mass spectrometry ; Size exclusion chromatography ; Crude oil analysis ; Biodegradation ; Biological markers ; C- and H-isotopes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Microorganisms have been isolated from a biodegraded crude oil from the Gifhorn trough, Lower Saxony. A non-degraded crude oil, related to the same source rock as the biodegraded one, was inoculated with the microorganisms found and the course of biodegradation thus initiated was followed by gas and liquid chromatographic techniques. The influence of biodegradation on commonly used oil-to-oil correlation parameters was investigated in detail.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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