[Metabolism of different histone fractions under induction of rat liver regeneration].

Histone metabolism in liver studied within 72-hour period of liver regeneration after partial hepatectomy in 24 hours after the injection of 14C-amino acids in rats. The increase in radioactivity of f2a, f3 and f2b histones and the simultaneous decrease in f1 histone radioactivity was observed in regenerating rat liver as compared with the level of radioactivity estimated for the respective histones in ectomized liver lobes. These changes, which are characteristic for regenerating liver, were not observed after the shame operation and they did not eliminate after the injection of respective unlabelled amino acid. Possible correlation between the increase in specific radioactivity of most nuclear histones under regeneration process and a migration of pre-synthesized labelled histone molecules into nucleus, and also a transformation into histones of other nuclear proteins is discussed.