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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 261 (1968), S. 26-41 
    ISSN: 1432-1912
    Keywords: Liver ; Growth ; DNA ; Drugs ; Induction ; Leber ; Wachstum ; DNS ; körperfremde Stoffe ; Induktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Verabreichung der drei körperfremden Stoffe α-HCH, Phenobarbital und CFT 1201, führt zu einer Vergrößerung der Leber bei Ratten. Zeitlicher Verlauf und Ausmaß dieser Gewichtszunahme wurden untersucht und ihre Ursachen studiert. Das relative Lebergewicht 7 Wochen alter weiblicher Ratten wird durch einmalige Gabe von α-HCH um 45%, durch mehrmalige Gaben um maximal 100% erhöht. Es steight nach wiederholter Verabreichung von Phenobarbital um 35%, von CFT 1201 um 14%. Die Organvergrößerungen sind nach Absetzen der Substanzen weitgehend reversibel. Das Ausmaß der Gewichtszunahme ist altersabhängig. α-HCH und Phenobarbital bewirken in der Leber eine Zunahme von Protein, Lipoid, Glykogen und Wasser in physiologischen Relationen; CFT 1201 verursacht eine Verfettung des Organs. α-HCH und Phenobarbital lösen keine histologisch nachweisbaren Zellschädigungen aus. Unter α-HCH und Phenobarbital ist eine Vermehrung der Leber-DNS nachweisbar; der Zuwachs an DNS ist prozentual jedoch geringer als der Zuwachs an Lebermasse. Beide Substanzen beschleunigen den Einbau von radioaktivem Thymidin in Leber-DNS — bei HCH-Verabreichung bis zum Zehnfachen der Kontrollwerte. Die Ergebnisse lassen darauf schließen, daß α-HCH und Phenobarbital in der Leber Wachstumsvorgänge auslösen, die mit einer Neu-Synthese von DNS einhergehen.
    Notes: Summary The administration to rats of α-benzene hexachloride (α-BHC=α-HCH) or of phenobarbital, substances known to enhance the metabolism of drugs, or of CFT 1201 (β-diethylaminoethyl phenyldiallylacetate), an agent which inhibits drug metabolism, leads to an enlargement of the liver. In this study the time-course of the changes in liver weight has been followed and the factors underlying this process have been studied. In 7 weeks old female rats the relative weight of the liver increases after a single dose of α-BHC by 45%, and after repeated doses by up to 100%. After repeated doses of phenobarbital the maximum gain in weight is 35% and after CFT 1201 14%. The enlargement of the organ is largely reversible when the substances are withdrawn. The extent of the weight gain is dependent on age. α-BHC and phenobarbital produce an increase, in physiological proportions, in the liver content of protein, lipids, glycogen and water. They do not produce cell damage, as judged by light microscopy. In contrast, CFT 1201 causes fatty infiltration of the organ. Following the administration of α-BHC and of phenobarbital the DNA content of the liver rises. The rise is not proportional to the increase in liver size. Both α-BHC and phenobarbital accelerate the incorporation of labelled thymidine into liver DNA. After α-BHC the rate of incorporation is up to ten times that of controls. It is concluded from these results, that α-BHC and phenobarbital initiate growth processes in the liver which are accompanied by de novo synthesis of DNA.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 298 (1977), S. 137-142 
    ISSN: 1432-1912
    Keywords: Liver growth ; DNA ; Hypophysis ; α-Hexachlorocyclohexane ; Phenobarbital ; Partial hepatectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary α-Hexachlorocyclohexane (α-HCH) or phenobarbital (PB) elicit growth and cell multiplication in rat liver. In hypophysectomized rats, α-HCH and PB induce an increase in liver mass, but no increase in liver DNA. Hypophysectomy without additional treatment results in a decrease of liver size and RNA, while the DNA content remains unchanged, thereby leading to a relative DNA surplus. 1/3-hepatectomy in hypophysectomized animals leads to a small increase of hepatic DNA only; after 2/3-hepatectomy 75–80% of the original liver DNA are restored. In rats with intact hypophysis losses of liver DNA are known to be restored completely. The findings suggest that the relative DNA surplus in hypophysectomized rats prevents the stimulation of DNA synthesis by weak growth stimuli such as α-HCH, PB, and 1/3-hepatectomy. If the relative DNA surplus is eliminated by partial hepatectomy, the inducers do produce DNA multiplication. It is concluded that the induction of liver growth and cell multiplication by α-HCH and PB does not require the presence of the hypophysis or one of its hormones.
    Type of Medium: Electronic Resource
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