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[해외논문] Changes in mouse liver RNA induced by ethyl carbamate (urethane) and methyl carbamate

Zeitschrift fuer Krebsforschung und klinische Onkologie.: Cancer research and clinical oncology, v.76 no.1, 1971년, pp.69 - 82  

Williams, K. ,  Kunz, W. ,  Petersen, K. ,  Schnieders, B.

Abstract AI-Helper 아이콘AI-Helper

SummaryActinomycin D reduced the in vivo labelling of liver RNA by tritiated methyl or ethyl carbamates. Fractionation of the RNA from mice injected 24 h previously with [3H] methyl carbamate, [2-3H] ethyl carbamate or ethyl [carboxy-14C] carbamate on MAK columns, sucrose density gradients and calci...

Abstract

ZusammenfassungLeber-RNS von männlichen NMRI-Mäusen, die 24 Std nach Injektion von (3H)Methylcarbamat, (2-3H) Äthylcarbamat oder Äthyl-(carboxy-14C)-carbamat durch Phenolextraktion nach Georgiev gewonnen wurde, enthielt carboxyalkyl-markierte Methylbzw. Äthylester der Cytosin-5-carboxylsäure. Die in vivo-Reaktion der Carbamate mit Leber RNS wurde durch Actinomycin D gehemmt. Bei der Fraktionierung durch Dichtegradientenzentrifugation, Polyacrylamidgelelektrophorese sowie Säulenchromatographie über Hydroxylapatit und Methylalbumin-Kieselgur wurde der überwiegende Teil der Aktivität (80%) in den Fraktionen gefunden, die neu synthetisierte RNS enthalten. Es ist deshalb anzunehmen, daß die Cytosin-5-carboxylate aus den Carbamaten oder ihren Metaboliten vor der Inkorporation in die RNS-Kette gebildet werden, oder daß die RNS in der Synthese-Phase gegenüber der Einwirkung chemisch aktiver Carbamatmetabolite empfindlicher ist. Das nicht carcinogene Methylcarbamat wurde dabei etwa 10fach stärker inkorporiert als das carcinogene Äthylcarbamat. Synthese- und Umsatzgeschwindigkeit der Leber-RNS wurden durch beide Carbamate etwa ihrer Inkorporationsrate entsprechend gesteigert.

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