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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 43 (1979), S. 115-120 
    ISSN: 1432-0738
    Keywords: Hexachlorobenzene ; Steroid-5α-reductase ; 3-hydroxysteroid dehydrogenases ; Porphyria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Erwachsene weibliche Wistar-Ratten wurden mit 0.05% Hexachlorbenzol enthaltendem Futter ernährt. Am 60. Tag dieser Behandlung waren die spezifischen Aktivitäten der NADPH: Δ 4-3-oxosteroid-5α-Reduktase und der 3-Hydroxysteroid-Dehydrogenasen in Lebermikrosomen, verglichen mit Kontroll-Ratten, vermindert. Die cytoplasmatische 5β-Reduktion war bei HCB-behandelten Ratten höher als bei Kontroll-Ratten. Diese Veränderungen des Steroidmetabolismus führen zu vermehrter Bildung von 5β-H-Steroiden, von denen bekannt ist, daß sie Induktoren der Porphyrin-Biosynthese sind.
    Notes: Abstract Adult female Wistar rats were fed with a diet containing 0.05% hexachlorobenzene. On the 60th day of this treatment the specific activities of NADPH: Δ 4-3-oxosteroid-5α-reductase and the 3-hydroxysteroid dehydrogenases in rat liver microsomes were diminished compared to control rats. The cytoplasmatic 5β-reduction was higher in HCB treated rats than in control rats. These alterations of the steroid metabolism lead to increased formation of 5β-H-steroids which are known to be inducers of the porphyrin biosynthesis.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 50 (1982), S. 233-239 
    ISSN: 1432-0738
    Keywords: Hexachlorobenzene ; Steroid-5α-reductase ; Steroid-5β-reductase ; Glucuronyl transferase ; Porphyria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Adult female rats were fed with a diet containing hexachlorobenzene to induce a porphyria. 5α/5β-ratios of androstane steroids in blood were 0.61 ± 0.13 in porphyric rats and 1.05 ± 0.35 in normal rats. Etiocholanolone treatment of rats was ineffective in generation of a porphyria. The activity of microsomal glucuronyltransferase increased from 0.20 ± 0.04 mU/mg to 0.77 ± 0.23 mU/mg by this treatment. Administration of Flutamide (4′-nitro-3′-trifluoromethylisobutyranilide) to porphyric rats resulted in a decline of porphyrin excretion by 55%. The hepatic NADH-5β-reductase was strongly inhibited by this drug, whereas NADPH-5β-reductase displayed a slightly increased activity. These findings are further evidence for the involvement of 5β-steroids in the formation of porphyria.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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