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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 69 (1991), S. 536-551 
    ISSN: 1432-1440
    Keywords: Vasculitis ; Polyarteritis ; Wegener's granuloma ; Anti-neutrophil Cytoplasmic antibody (ANCA) ; Schonlein-Henoch purpura ; Glomerulonephritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary After a long period during which few new data on the vasculitides emerged, the past decade has seen a real explosion of data on the subject. This began with basic clinical descriptions and the deliniation of long term outcome as survival improved to a major extent under the influence of improved treatment regimes. In parallel, better understanding of the immunopathology has emerged. Of particular interest have been descriptions of autoantibody systems in vasculitis which seem to be specific to vasculitis and therefore diagnostically useful: the antineutrophil cytoplasmic antibodies (ANCA). Whether or not these are pathogenetically significant as well as useful remains a matter for debate. In parallel, anti endothelial cell antibodies have been described, but their role (if any), in pathogenesis remains equally obscure. There are some suggestions that vasculitis is becoming more common, but increased awareness and the availability of ANCA have undoubtedly increased awareness of the subject.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 4 (1990), S. 193-198 
    ISSN: 1432-198X
    Keywords: Membranous nephropathy ; Proteinuria ; Nephrotic syndrome ; Prednisone ; Prednisolone ; Hepatitis B ; Chlorambucil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Membranous nephropathy is predominantly a disease of middle-aged and elderly individuals, and is thus rather an uncommon finding in proteinuric and nephrotic children. In children, it differs in several important respects from the disease as seen in adults: an apparent associated cause is more common, macroscopic haematuria is seen quite frequently, a relapsing course is more often noted, renal venous thrombosis is not found and evolution into renal failure is the exception. Nevertheless, a proportion of children with membranous nephropathydo evolve into renal failure, and their management is discussed with particular reference to recent papers on the treatment of membranous nephropathy in adults. An aggressive search for associated disease is worthwhile in children, and one should wait to see what the evolution or proteinuria and renal function may be. If a progressive course becomes evident, then a trial of treatment with corticosteroids is worthwhile, but if this is ineffective then a more aggressive approach involving the use of alkylating agents may be justified. It remains undetermined what the best regime in children and adolescents may be.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 2 (1988), S. 490-497 
    ISSN: 1432-198X
    Keywords: Vasculitis ; Wegener's granuloma ; Polyarteritis ; Antileucocyte cytoplasm antibodies (ANCA) ; Immune complexes ; Cellmediated immunity ; Immunosuppressive treatment ; Plasma exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Vasculitis is rare in childhood, apart from Henoch-Schönlein purpura, and paediatric nephrologists see few cases of Wegener's granuloma or microscopic polyarteritis. In contrast, this pattern is reversed in adults. Recently much information about the presentation and longer-term course of both these conditions has been described in adults, and more aggressive treatment of severe cases with renal failure has improved the outlook from a 5-year survival of about 5%–80% or more. In parallel, it has become evident that the abundant immune complexes in the circulation of patients with vasculitis may play little or no role in the pathogenesis of the vasculitic lesions. Current interest centres both on the possible role of cellmediated immunity and the recent finding of antibodies which react with antigens in the cytoplasm of leucocytes. These antibodies seem to be of clinical use in defining patients with vasculitis, especially when only the kidney is involved at a clinical level. The nature of this leucocyte antigen (or antigens) and the possible role of antibodies directed against them in the pathogenesis of the disease are subjects of current work in many loboratories.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 8 (1994), S. 230-249 
    ISSN: 1432-198X
    Keywords: Systemic lupus erythematosus ; Nephritis ; Prednisolone ; Plasma exchange ; Cyclophosphamide ; Azathioprine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Lupus nephritis in childhood usually presents after the age of 10 years, and presentation under 5 years is very rare. More males (F∶M ratio 4.5∶1) are affected than in adult-onset cases, but the ratio is the same in prepubertal and pubertal children. The incidence of clinically evident renal disease is greater at onset than in adults (82%), the usual presentation being with proteinuria, 50% having a nephrotic syndrome. Half the children show World Health Organisation class IV nephritis in renal biopsies. Neuropsychiatric lupus is present at onset in 30%, may complicate 50% at some point and remains a major problem. Prognosis has improved greatly over the past 30 years, at least in part the result of immunosuppressive treatment. Treatment of the initial phase may be guided by the severity of the renal biopsy appearances, more aggressive treatment including cytotoxic agents, i.v. methylprednisolone and perhaps plasma exchange, although the value of exchange is not established. Controversy persists as to the most effective cytotoxic treatment in the acute phase, both oral and i.v. cyclophosphamide and azathioprine being used in different units. In the chronic maintenance phase it seems established both clinically and histologically that addition of a cytotoxic agent improves outcome, but again the drug and route of administration are contentious. Azathioprine has the advantage of being safe for pregnancy and not gonadotoxic, whilst i.v. cyclophosphamide has been demonstrated to improve results over prednisolone alone in controlled trials and has advantages in non-compliant patients. No trial comparing the two regimes has been carried out, and one is needed. Today children much less commonly go into renal failure, and the main causes of actual death (15% of patients over 10 years) are now infections and extra-renal manifestations of lupus, principally neurological. Morbidity of the disease and the treatment remain a major problem, especially when treatment exacerbates complications of the disease itself, such as infections, osteonecrosis, thrombosis, vascular disease and possibly neoplasia.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The fine structure of the extracellular matrix during epithelio-mesenchymal interactions in the rabbit embryonic tooth germ is described using light and electron microscopy. Observations are restricted to the labial cervical loop region at the bell stage of development in maxillary and mandibular incisor tooth germs. Histochemical methods demonstrate a PAS-positive basement membrane between outer enamel epithelial cells and adjacent undifferentiated mesenchymal cells. The metachromatic region circumscribes the dental papilla region, becoming more intense and wider in association with cells illustrative of more advanced stages of differentiation. Ultrastructural observations of the basal lamina associated with outer enamel epithelial cells, cervical proliferating epithelial and mesenchymal cells, and with inner enamel epithelial cells and pre-odontoblasts are reported. The characteristic mesenchymal filopodia appeared in close proximity to the basal lamina. Microfibrils are seen as depositions on the basal lamina and in association with filopodia. The concentration of intercellular microfibrils is increased when in association with epithelia showing advanced differentiation. Collagen fibrils are frequently noted in peripheral association with mesenchymal cells but not adherent to the basal lamina. Numerous homotypic and heterotypic cell junctions are seen. An understanding of intercellular communication between heterotypic cells may be enhanced by postulating a dual developmental origin for the microfibrils associated with the basal lamina. The under surface of the basal lamina facing the extended mesenchymal filopodia appears to be a significant factor during epithelio-mesenchymal interactions, subsequent extracellular matrix formation, and morphogenesis.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Dehydroascorbate, an electron affinic metabolite of vitamin C, sensitized Ehrlich ascites tumor cells, in vivo, to radiation and was selectively toxic to V79 Chinese hamster lung cells under hypoxic conditions (without radiation). The radiosensitization may involve both the electron affinic nature of dehydroascorbate as well as its ability to oxidize the intracelluar NAD(P)H and non-protein sulfhydryl. Dehydroascorbate's oxidation of NAD(P)H required higher concentrations than other sulfhydryl oxidants such as N-ethylmaleimide and diamide. The oxidation of NAD(P)H by dehydroascorbate could be reversed by glucose. Hypoxic cell radiosensitization of V79 cells in tissue culture by dehydroascorbate could not be easily demonstrated because of the rapid breakdown and appreciable cytotoxicity of the drug at high concentration. The cytotoxicity was found to occur with both high and low densities of V79 cells. With low cell densities small amounts of oxygen did not reduce the cytotoxicity of dehydroascorbate, but virtually eliminated the cytotoxicity of nitroaromatic electron affinic compounds (metronidazole and Ro-07-0582). The cytotoxicity to dense cell suspensions was found to depend upon the type of buffer included in the reaction medium. The maximum cytotoxicity was obtained in buffer free saline. The reduced form of dehydroascorbate, vitamin C, was found to be toxic only under aerobic conditions. The aerobic cytotoxicity could be prevented by the addition of catalase to the growth medium or by an increase in cell density, suggesting it was caused entirely by the production of H2O2 from the oxidation of vitamin C.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 11 (1938), S. 433-454 
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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