title: [mRNA degradation in membrane-bound and free polyribosomes in rat liver cells after exposure to actinomycin D and cycloheximide].
abstract: Actinomycin D caused degradation of mRNA both in membrane-bound and in free polyribosomes from rat liver cells. The rate of mRNA destruction was distinctly higher in free polyribosomes, than in membrane-bound ones. Cycloheximide inhibited the mRNA destruction in both types of polyribosomes. At the same time, the stabilizing effect of cycloheximide on mRNA was less distinct in free polyribosomes. A decrease in specific radioactivity of mRNA from membrane-bound and free polyribosomes was observed after prolonged pretreatment with actinomycin D. The specific radioactivity of mRNA from polyribosomes of both types was not altered after simultaneous administration of actinomycin D and cycloheximide into rats. Occurence of two fractions of mRNA, dissimilar in stability, is possible both in membrane-bound and in free polyribosomes from rat liver cells.
mesh_terms: D000818:Animals; D003513:Cycloheximide / Q000494:pharmacology*; D003609:Dactinomycin / Q000494:pharmacology*; D008099:Liver / Q000166:cytology / Q000187:drug effects*; D008297:Male; D011132:Polyribosomes / Q000187:drug effects*; D012333:RNA, Messenger; D051381:Rats
chemical_list: D012333:RNA, Messenger; D003609:Dactinomycin; D003513:Cycloheximide
vernacular_title: Degradatsiia mRNK membranosviazannykh i svobodnykh poliribosom v kletkakh pecheni krys na fone deĭstviia aktinomitsina D i tsiklogeksimida.