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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 60 (1982), S. 1127-1135 
    ISSN: 1432-1440
    Keywords: Renal corticosteroid metabolism ; Isolated kidney ; Suspended tubular fragments ; Corticosterone ; Aldosterone ; Corticosteroids ; Metopirone ; Sex-dependency ; Renaler CS-Stoffwechsel ; isolierte Niere ; suspendierte Tubulusfragmente ; Corticosteron ; Aldosteron ; Corticosteroide ; Metopiron ; Geschlechtsabhängigkeit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In IK und STF von männlichen und weiblichen Ratten wurde der renale Stoffwechsel von B in vitro untersucht. Bei männlichen Ratten wurden vier lipidlösliche Metabolite (I–IV) gefunden. I und II waren polarer als B; die Strukturanalyse ergab für I: 11-dehydro-20-hydroxy-B und für II: 20-hydroxy-B. Die Struktur der beiden Metabolite III und IV, die weniger polar waren als B, konnte noch nicht aufgeklärt werden. Nierengewebe von weiblichen Ratten bildete aus B vorwiegend die weniger polaren Metabolite III und IV. Der renale Stoffwechsel von B ist somit geschlechtsabhängig. — Eine Übersicht über die Arbeiten in der Literatur belegt, daß die Nieren nicht nur B sondern auch A, Cortisol, Progesteron und andere CS metabolisieren.
    Notes: Summary IK and STF from male and female rats have been used to study in vitro the renal metabolism of B. in male rat tissue four lipid soluble metabolites (I–IV) have been found, I+II being more polar and III+IV being less polar than B. I and II have been identified as 11-dehydro-20-hydroxy-B and 20-hydroxy-B. The structure of III and IV remains to be determined. Renal tissue from female rats produced predominantly III indicating sexual variations of steroid metabolism in kidneys. — The literature has been reviewed which documents that the kidneys in addition to B metabolize A, cortisol, progesterone and other corticosteroids.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 43 (1965), S. 794-795 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A new method for the fixation of renal tubules in vivo using microperfusion has been described. The perfusions were carried out either during free-flow or after oil-blockade of the tubular segment proximal to the puncture site. The fixatives used were osmiumtetroxide (1 or 3%) or glutaraldehyde (6,25%), the embedding medium was Vestopal W. The histological picture of the renal cortex in these preparations resembled that seen with light microscopy in vivo. Moreover light and electron microscopic pictures demonstrated a good state of preservation of the tubular epithelium.
    Notes: Zusammenfassung Es wird berichtet über eine Methode zur Fixierung von Nierentubuli in vivo mit Hilfe der Mikroperfusion. Die Durchströmung erfolgte entweder bei freiem Fluß der Tubulusflüssigkeit oder nach Öl-Blockade des stromaufwärts gelegenen Segmentes. Zur Fixierung wurden gepufferte Lösungen von Osmiumtetroxyd (1% oder 3%) oder von Glutaraldehyd (6,25%) verwendet. Einbettung der Gewebestücke in Vestopal W. Das histologische Bild entspricht dem Intravitalbild der Nierenrinde bei auflichtmikroskopischer Betrachtung. Die licht- und elektronenmikroskopischen Aufnahmen zeigen einen guten Erhaltungszustand des Tubulusepithels.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 1075 (1991), S. 206-212 
    ISSN: 0304-4165
    Keywords: (Rat kidney) ; 11-Dehydrocorticosterone ; 11β-Hydroxysteroid dehydrogenase ; Corticosteroid metabolism ; Enzyme inhibitor ; Glycyrrhetinic acid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Molecular Cell Research 1010 (1989), S. 311-317 
    ISSN: 0167-4889
    Keywords: (Dog) ; (Monkey) ; (Pig) ; 11-Hydroxysteroid dehydrogenase ; Adrenal steroid ; Corticosteroid metabolism ; Corticosterone ; Renal epithelial cell line
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 32 (1989), S. 581-590 
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0039-128X
    Keywords: 11β-HSD ; 11β-OHSD ; 11β-hydroxysteroid dehydrogenase ; bile acids ; cholestasis ; corticosteroid metabolism
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 411 (1988), S. 529-539 
    ISSN: 1432-2013
    Keywords: Corticosteroid metabolism, renal ; Aldosterone ; Isolated rat kidney ; Kidney slices ; Liver slices ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the present study the formation of lipid soluble metabolites from3H-aldosterone was investigated in vitro in isolated kidneys and kidney and liver slices of Sprague Dawley rats. The steroids were separated by HPLC (forward and reversed phase systems) and detected on-line as UV- or3H-chromatograms. Apart from an unenzymatically formed substance, isoaldosterone, three less polar metabolites were traced (A1, A2, A3). The structure of the quantitatively most important metabolite (A1), was identified as 5α-dihydroaldosterone using a combination of techniques such as chromatographic comparison with reference steroids, antibody binding and mass spectrometry. Evidence for further conversion of DHaldo to 3α,5α-tetrahydroaldosterone was obtained in chromatographic and antibody binding studies. The formation of metabolites was not dependent on glomerular filtration. Furthermore it displayed regional heterogeneity with highest activity in the outer medulla. Finally it was observed that the in vitro metabolism of aldosterone was not saturable over a range of initial aldo concentration of 10−9 to 10−5 M.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 232 (1957), S. 255-255 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Radiation and environmental biophysics 2 (1964), S. 87-104 
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Zusammenfassung Bei gesunden Normalpersonen wurde gammaspektrometrisch über die Gamma-Emission des im natürlichen Kalium enthaltenen Isotops K40 der Gesamtkörper kaliumgehalt gemessen. Der Mittelwert von GKK betrug bei Männern 1,68 gK/kg, bei Frauen 1,51 gK/kg mit einer Schwankungsbreite ≤± 15% (n=92). Die flammenphotometrisch gemessene Kaliumkonzentration im Plasma von Normalpersonen war 4,03 mäq/l±0,26, die gleichzeitig gemessene Kaliumkonzentration im Erythrozytensediment 90,9 mäq/l Sediment±2,6 (n=57). Bei gesunden Versuchspersonen wurden die drei genannten Kaliumparameter gleichzeitig gemessen und die Veränderung dieser Größen bei der durch ein Saluretikum verursachten experimentellen Kaliumverarmung verfolgt. Während einer Versuchsperiode von 7 Tagen nahm der Gesamtkörperkaliumgehalt bei Einnahme vonChlorthalidon (2×100 mg/Tag) im Mittel um 7,7%, die Kaliumkonzentration in Plasma bzw. Erythrozyten um 27,5% bzw. 3,1% ab. Erythrozyten stellen unter den hier gewählten Versuchsbedingungen ein Zellsystem dar, das qualitativ Änderungen der Kaliumkonzentration des intrazellulären Raumes anzeigt. Das Ausmaß des Kaliumverlustes ist jedoch bei anderen Zellsystemen größer, wie sich aufgrund der Bestimmung des Gesamtkörperkaliumgehaltes nachweisen läßt. Die Bedeutung der Bestimmung verschiedener Kaliumparameter beim Menschen für die klinische Beurteilung pathologischer Zustände wird diskutiert.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 408 (1987), S. 46-53 
    ISSN: 1432-2013
    Keywords: Renal corticosteroid metabolism ; Corticosterone ; Subcellular localization ; Enzyme kinetics-HPLC ; 11β-hydroxysteroid-dehydrogenase ; Kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An attempt has been made to identify the subcellular localization of renal corticosteroid metabolism. Subcellular fractions were prepared by differential centrifugation, identified by marker enzymes and incubated under different conditions with corticosterone (B). The NADP+/NADPH dependent metabolism of B could be localized in the nuclear and microsomal fraction. The most prominent metabolite was 11-dehydro-B, which is formed by 11β-hydroxysteroid dehydrogenase (EC 1.1.1.146). Enzyme kinetic studies of this enzyme with B as substrate revealed apparentK m-values in the range of 10−7 M for both the nuclear and microsomal fraction.
    Type of Medium: Electronic Resource
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