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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
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    ISSN: 1432-2013
    Keywords: Unanaesthetized Rat ; Systemic Arterial Blood Pressure ; Diastolic Blood Pressure ; Indirect Tail-Cuff Method ; Impedance Plethysmography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Both diastolic and systolic arterial blood pressure can be measured with reasonable accuracy in the intact unanaesthetized rat by an improved tail-cuff method, which is described. In 12 rats the results of the indirect technique were compared with simultaneous recordings of intraaortic blood pressure. From this comparison correlation coefficients were calculated, which were 0.944 for the diastolic and 0.963 for the systolic readings.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2013
    Keywords: Renal corticosteroid metabolism ; Corticosterone ; Kidney metabolism of corticosteroid ; Isolated rat kidney ; Metopirone (Metyrapone) ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Kidneys of male Sprague Dawley rats have been isolated and perfused in vitro in order to study the metabolism of corticosterone (B). B is the main endogenous corticosteroid in this species. Using3H-B and HPLC for the separation of steroid metabolites it has been possible to detect radioactive derivatives of B which have been denoted as met I, II and III. These substances were purified and compared with authentic reference hormones under different isocratic and gradient elution techniques. We observed chromatographic identity of met I with 11-dehydro-20-dihydro-B, of met II with 20-dihydro-B and of met III with 5α-H-4,5-dihydro-B. From the fact that conversion of B can be observed with normal (50 g · l−1 albumin in perfusate) and elevated (75 g · l−1) colloid osmotic pressure of the recirculating perfusate it can be concluded that B gets access to the metabolic site in renal tissue not solely by glomerular filtration and tubular reabsorption. The metabolites identified presently are excreted in the urine. Metopirone increased the concentration of met I and decreased the concentration of met II. This is compatible with the concept of a stimulatory effect of metopirone on a C-20-hydroxysteroid oxidoreductase and a C-11-hydroxysteroid dehydrogenase.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 400 (1984), S. 372-376 
    ISSN: 1432-2013
    Keywords: Renal corticosteriod metabolism ; Corticosterone ; Isolated rat kidney ; Sex dependency of renal steroid metabolism ; HPLC-analysis ; 11-dehydro-B
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have previously demonstrated that isolated kidneys from male rats convert corticosterone (B). The metabolites are formed in renal tissue, released into the recirculating perfusate and excreted in the urine (5). They have been identified as: 11-dehydro-20ζ-dihydro-B (met I), 20 ζ-dihydro-B (met II) and 5α-H-4,5-dihydro-B (met III), using HPLC. In view of sex dependency of hepatic corticosteroid metabolism we have presently investigated whether or not equivalent sexual differences exist in renal tissue. In applying appropriate HPLC-techniques we could demonstrate a fourth metabolite formed from B, which was chromatographically identical with 11-dehydro-B (=met IV). Female rat kidneys form predominantly the less polar metabolites III and IV, in contrast to kidneys from male rats, which produce, met III and the more polar metabolites I and II
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 400 (1984), S. 377-380 
    ISSN: 1432-2013
    Keywords: Renal corticosteroid metabolism ; Corticosterone ; Kidney steroid metabolism ; Isolated rat kidney ; HPLC-analysis ; Mass spectrometric analysis ; 20β-dihydro-corticosterone ; 11-dehydro-corticosterone ; 11-dehydro-20β-dihydro-corticosterone ; 5α-H-4,5-dihydrocorticosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have previously demonstrated that isolated rat kidneys in vitro convert corticosterone (B). Four lipid soluble metabolites (met I, II, III and IV) have been identified which differ in polarity from the parent hormone [2, 5, 6, 11, 15, 16]. In the present experiments these metabolites have been extracted from perfusate after 4 h of recirculation through isolated kidneys of male and female rats. Subsequently they have been separated by HPLC using a polar stationary phase system and n-hexane and isopropanol as eluents. The chromatographic comparison of met II with authentic 20α-and 20β-isomers documented that met II is identical with 20β-dihydro-B. Measurements of the mass spectra of the purified samples revealed the following structures: met I=20β-dihydro-11-dehydro-B, met II=20β-dihydro-B, met III=5α-H-4,5-dihydro-B and met IV=11-dehydro-B.
    Type of Medium: Electronic Resource
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