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  • 1
    ISSN: 1432-2013
    Keywords: Glomerulo-Tubular Balance ; Reabsorptive Capacity ; Variations of GFR ; Renal Artery Constriction ; Glomerulo-tubuläre Balance ; Resorptionskapazität ; Filtravariationen ; Constriction der Nierenarterie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the present study it is demonstrated that reabsorptive functions of the proximal tubule during partial renal artery clamping display significant differences when compared to spontaneous GFR variations. During moderate clamping fractional fluid reabsorption was 69.8% and fell during severe clamping to 55.2%. Proximal tubular passage time increased progressively with the degree of clamping. This indicates that radius does not change as a function of GFR, a finding supported by microphotography of the renal surface. During moderate arterial clamping proximal reabsorptive rate was correlated to the tubular cross-sectional area, but in the face of severe clamping this relationship was abolished. We conclude, therefore, that mechanisms other than tubular geometry participate in regulating proximal tubular reabsorption, when GFR is altered by arterial constriction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Renal Transport ; Proximal Glomerulo-Tubular Balance ; Lateral Net Flux ; Variations of GFR ; Tubular Diameter ; Renaler Transport ; Proximale glomerulo-tubuläre Balance ; Lateraler Nettofluß ; GFR-Variationen ; Tubulärer Durchmesser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In rats with hereditary Diabetes insipidus (Brattleboro strain) proximal fluid reabsorption was studied during spontaneous variations of GFR. Independent of kidney weight and arterial blood pressure total kidney GFR varied between 0.35 ml/min×gKW and 1.8 ml/min×gKW, while single nephron filtrate showed a variation between 18 nl/min×gKW and 66 nl/min×gKW. End-proximal TF/P inulin of 78 fluid samples did not correlate with filtration rate and averaged 2.38±0.55 S.D. Also, proximal transit time was independent of filtration rate with a mean of 9.7 sec±1.1 S.D. These results imply a direct correlation between mean luminal radius and filtration rate, which was demonstrated by microphotography of the renal surface. Our data show that complete glomerulo-tubular balance in the proximal tubule exists during spontaneous variations of glomerular filtration rate. In support of the hypothesis ofGertz [4,6] the lateral net fluid flux was found to be linearly dependent upon tubular surface area. In addition, intratubular volume changed in direct proportion to single nephron filtrate. The present results are interpreted to further strengthen the assumption of a critical influence of tubular geometry on proximal fluid reabsorption during spontaneous variations of GFR.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Interstitielle Fibrose ; Niereninsuffizienz ; Glomerulumschäden ; Membranoproliferative Glomerulonephritis ; Interstitial fibrosis ; Renal insufficiency ; Glomerular lesions ; Membranoproliferative GN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Morphometric investigations in 33 patients suffering from membranoproliferative glomerulonephritis at different grades of glomerular involvement showed that there is no certain relationship between the severity of glomerular lesions and the serum creatinine level. On the other hand there is a significant positive correlation between the relative interstitial volume and the level of serum creatinine. The best congruence (r=+0,87,p〈0.0001) showed an exponential functiony=0.563·e 0.049x . We therefore conclud that in membranoproliferative glomerulonephritis which is generally considered to be a glomerular disease, interstitial changes have to be taken into account as a cause of renal insufficiency. Glomerular lesions alone cannot explain the functional impairment. The pathophysiologic factors concerning increased interstitial volume as a cause of renal insufficiency — probably immunologic in origin — are yet to be completely clarified.
    Notes: Zusammenfassung An 33 Patienten mit membranoproliferativer GN verschiedener Schweregrade konnte gezeigt werden, daß keine sicheren Beziehungen zwischen Ausmaß der glomerulären Veränderungen und dem Serum-Kreatininspiegel bestehen. Andererseits zeigen morphometrische Untersuchungen signifikante positive Korrelationen zwischen dem relativen Interstitiumvolumen und dem Serum-Kreatininspiegel. Der Kurvenverlauf entspricht am ehesten einer Exponentialfunktion (y=0,563·e 0,049x ,r=+0,87,p〈0,0001). Bei der membranoproliferativen GN, die allgemein als rein glomeruläre Erkrankung angesehen wird, müssen auch Veränderungen im Interstitium als eine Ursache der Nierensuffizienz in Betracht gezogen werden. Glomeruläre Schäden allein reichen zur Erklärung der beeinträchtigten Nierenfunktion nicht aus. Der pathophysiologische Mechanismus, der über eine — möglicherweise immunologisch bedingte — Verbreiterung des Niereninterstitiums zur Niereninsuffizienz führt, muß noch geklärt werden.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 54 (1976), S. 75-81 
    ISSN: 1432-1440
    Keywords: Membranoproliferative Glomerulonephritis ; Lipodystrophie ; nephritogener Faktor ; C3-Mangel ; Membranoproliferative glomerulonephritis ; Lipodystrophy ; Nephritogenic factor ; C3-deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The course of disease of a patient with membranoproliferative glomerulonephritis and partial lipodystrophy is described. The case is further characterized by a deficiency of C3 and of C3-activator, by normal values of C4, by evidence of the nephritogenic factor, by raised fibrin degradation products and by an unselective proteinuria. The course of the glomerulonephritis runs parallel to a pronounced susceptibility to infection (at first varicella, tonsillitis and measles, later pneumonia, meningitis, encephalitis and hepatitis). On account of a nephrotic syndrome and an initiative impairment of the renal function, a cytostatic treatment was begun, which although raising the C3 level, did not influence the further course of the disease. As the patient has a healthy identical twin sister without lipodystrophy, who shows no reduction in C3 and no nephritogenic factor, this case proves that these diseases are acquired and not genetically determined.
    Notes: Zusammenfassung Bei einer Patientin mit membranoproliferativer Glomerulonephritis und partieller Lipodystrophie konnte ein Mangel an C3 und C3-Aktivator bei normalem C4 nachgewiesen werden, sowie das Vorkommen des nephritogenen Faktors, vermehrte Fibrinspaltprodukte und eine unselektive Proteinurie. Der Verlauf der Glomerulonephritis wird durch eine erhebliche Infektneigung kompliziert (anfangs Windpocken, Tonsillitis, Masern, später Pneumonie, Meningitis, Encephalitis und Hepatitis). Wegen des nephrotischen Syndroms und beginnender Niereninsuffizienz wurde eine Cytostatika-Therapie begonnen, worauf zwar der C3-Gehalt anstieg, der Verlauf der Krankheit jedoch nicht beeinflußt wurde. Da die Patientin eine gesunde eineiige Zwillingsschwester ohne Lipodystrophie hat, die keine Verminderung der C3-Aktivität und keinen nephritogenen Faktor aufweist, beweist der vorliegende Fall, daß diese Krankheiten erworben und nicht genetisch determiniert sind.
    Type of Medium: Electronic Resource
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