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- W2412975327 abstract "This study has evaluated changes in RNA synthesis in livers under the distant influence of a malignant tumor. A transplantable-induced sarcoma (MCG 101), transplanted on inbred adult mice (C57BL/6J), was used. Activities of DNA-dependent RNA polymerase (EC 2.7.7.6) were measured in relation to RNA content and translational activity. Liver nuclei from freely fed sarcoma-bearing mice had increased RNA synthesis. As a consequence of this, RNA content per DNA was increased in liver tissue. This was independent of depressed food intake and malnutrition. Elevated RNA synthesis, proportional to the tumor burden was due to an increased proportion of chromatin-engaged RNA polymerase I and II activities. RNA polymerase III activity (template-engaged form) was unchanged when evaluated in isolated nuclei, but appeared to be increased in partially purified extracts of nuclei. RNA content in tumor-host liver was a composite of increased levels of rRNA and tRNA, whereas the levels of poly(A)+ mRNA could not be measured as increased. Overall translational activities in vitro of mRNA from liver tissue of tumor-bearing, pair-weighed, and freely fed tumor-free controls were qualitatively and quantitatively different. mRNA from tumor-bearing mice directed an increased synthesis, particularly of larger proteins (above 55,000 daltons) compared with control animals. The results support the conclusion that previous evidence of elevated net protein synthesis in tumor-host liver is accompanied by increased transcription of genes coding for RNA and also for some or several hepatic proteins." @default.
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- W2412975327 date "1985-11-01" @default.
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- W2412975327 title "Nuclear RNA polymerase activity in tumor-host livers" @default.
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- W2412975327 doi "https://doi.org/10.1152/ajpendo.1985.249.5.e461" @default.
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