[Differences in transcription of nuclear RNA from rat liver with normal and malignant growth].

Total nuclear RNA was isolated under conditions of actinomycin D blocking ion-exchange chromatography on kieselguhr columns with methylated albumin detected differences in transpiration of rat liver nuclear RNA with intensive normal and malignant growth. Actinomycin D in doses blocking the appearance of peculiar proteins in the blood serum of rats with the regenerating liver and RS-1 hepatoma produces a different effect on the biosynthesis of nuclear DNA-like RNA of the rat liver. 24h after a partial hepatectomy the antibiotic inhibits considerably the biosynthesis of nuclear DNA-like RNA which is eluated during chromatographying with 0.2% solution of sodium dodecyl sulphate at 70 degrees C. With RS-1 hepatoma the actinomycin D effect is most pronounced with respect to nuclear DNA-like RNA of rats with a tumour which is washed off from the column with a 0.2% solution of sodium dodecyl sulphate at 37 degrees C.