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- W1997594423 abstract "Nuclear ribonucleoprotein particles of 75S were obtained from rat liver nuclei after mild sonication and isotonic salt extraction only when the preparation was carried out in the presence of a cytosolic ribonuclease inhibitor. Particles of 38S were isolated in the absence of inhibitor. The 38S nuclear ribonucleoprotein (nRNP) particles showed a protein/RNA ratio of 8, and a buoyant density of 1.39 g/ml in cesium chloride solution. They were further characterized by the pattern of their proteins on sodium dodecylsulfate (SDS)-acrylamide gel electrophoresis. Incorporation of [3H]cytidine into nuclear RNA was reduced to approx. 20% of controls 3 and 6 h after administration of galactosamine or actinomycin D. However, when [3H]cytidine was administered 30 min prior to the drugs a decrease of radioactivity in 38S nRNP particles to 43 and 81% of controls was found after 3 h. The yield of 38S particles 3 h after galactosamine or actinomycin D dropped to 41% and 78% of controls, and after 6 h to 43 and 70%, respectively. Six hours after galactosamine or actinomycin D treatment, the protein to RNA ratio increased to 13.3 and 9.1. No significant changes in protein patterns 3 h after treatment with galactosamine or actinomycin D were observed. Possible mechanisms, such as impaired transport of 38S nRNP particles after actinomycin D treatment or increased loss of particles due to a defective nuclear membrane after galactosamine administration are discussed." @default.
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- W1997594423 date "1977-10-01" @default.
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- W1997594423 title "Comparative studies of the effects of galactosamine and actinomycin D on nuclear ribonucleoprotein particles from rat liver" @default.
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- W1997594423 doi "https://doi.org/10.1016/0014-4827(77)90012-x" @default.
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