Rates of histone acetylation and deacetylation in nuclei from fetal, adult, and two kinds of neoplastic rat hepatocytes were examined. Histone acetylation in isolated nuclei was measured in the presence of 6 mM sodium n-butyrate, a potent inhibitor of deacetylase, and in the absence of the inhibitor. The deacetylase activity was estimated from the difference between the rates with or without th...

Malignant tumour burden is a pathological s ta te associated with a considerable demand for nutrients by the growing tumour [l]. Although a great deal of work has been carried out, there are contradictory results about the effects of tumour burden on lipid metabolism both in experimental animals and man. Lipid oxidation has been reported either increased [2], unchanged [3] or decreased [4]. In ...

The U-l RNA is one of the low molecular weight nuclear RNAs of Novikoff hepatoma ascites cells that is specifically localized to the extranucleolar portion of the nucleus. After the RNA was purified by polyacrylamide gel electrophoresis, it was subjected to various enzymatic digestion procedures for determination of its primary nucleotide sequence. The U-l RNA contains 171 nucleotides. Its 5’ e...