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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 60 (1982), S. 651-657 
    ISSN: 1432-1440
    Keywords: Uremia ; cAMP ; lipolysis ; Glucagon ; Uremic metabolic disturbances ; Urämie ; cyclisches AMP ; Glukagon ; Lipolyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Vergleichend wurde der Effekt einer intravenös gegebenen Einzeldosis von Glukagon auf das Verhalten der cAMP-Konzentration im Plasma untersucht. Die Untersuchungen erfolgten an 7 gesunden Personen, 10 Patienten mit chronischer Niereninsuffizienz und 10 Patienten, die auf Grund des chronischen Nierenversagens einer Langzeithämodialysebehandlung bedurften. 10 min nach Glukagonanwendung zeigten die urämischen Patienten einen signifikanten (p 〈 0,0001) größeren Anstieg von cAMP im Vergleich zu der Kontrollgruppe. Die Glukosekonzentrationen zeigten nach Glukagon zwischen den beiden Gruppen keine Differenz. Die Lipolyse war in der urämischen Patientengruppe weniger stark ausgeprägt, als bei den Kontrollen (p 〈 0,003). Die Resultate ließen sich nicht auf Unterschiede in der Insulinantwort zurückführen. Die Befunde weisen auf ein unterschiedliches Verhalten der hepatischen Adenylatcyclase und der cAMP-Bildung zwischen gesunden und urämischen Personen hin. Diese Änderungen der cAMP-Aktivität können eine grundsätzliche Rolle bei der Pathophysiologie metabolischer Störungen bei Urämie spielen.
    Notes: Summary The effect of a single, intravenously administered dose of glucagon on plasma cyclic adenoside monophosphate (cAMP) was studied in seven normal subjects, ten patients with chronic renal failure (CRF), and ten patients with terminal renal insufficiency (TRI) receiving long-term haemodialysis treatment (HD). Ten minutes following glucagon administration, uremic patients displayed a significantly (P 〈 0.0001) greater increase in cAMP than control subjects. Glucose levels after glucagon administration did not differ significantly between the normal and uremic groups, and lipolysis was less pronounced in the uremic patients than in the controls (P 〈 0.003). These results could not be attributed to differences in serum insulin response. The findings demonstrate differences in the hepatic adenylate cyclase and cAMP response between normal and uremic subjects. These alterations in cAMP responsiveness may play a role in the pathophysiology of the metabolic disturbances associated with uremia.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1041
    Keywords: Amikacin ; gentamycin ; netilmicin ; sisomicin ; tobramycin ; kidney damage ; proximal tubule ; cell membrane ; AAP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of the aminoglycosides amikacin, gentamicin, netilmicin sisomicin and tobramycin on the proximal tubule of the human kidney was investigated in 78 healthy subjects. Fifteen adults were each given gentamicin, sisomicin or tobramycin 3 mg/kg bodyweight, 10 subjects received netilmicin 3 mg/kg or amikacin 15 mg/kg additionally seven subjects amikacin 10 mg and six subjects netilmicin 6 mg on three consecutive days. The principal enzyme of the brush border membrane of the proximal tubule, alanine aminopeptidase (AAP), was determined enzymatically and immunologically in 24-hour urines. The effects of the various aminoglycosides on the membranes were different. Less of membrane AAP was greatest after amikacin and was least after tobramycin. There was no difference between gentamicin, netilmicin, and sisomicin, which had an effect intermediate between the other two compounds. The elimination of AAP occurred at intervals whicht might possibly have been caused by impairment of cell cycles.
    Type of Medium: Electronic Resource
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