title: [The effect of cycloheximide on the entry into the S period of the nuclei in heterodikaryons].
abstract: Serum-deprived (0.2%) resting NIH 3T3 mouse fibroblasts were fused with serum-stimulated (10%) proliferating cells to elucidate mechanisms of entering into S-period operating in the nuclei of the heterokaryons under the effect of cycloheximide--an inhibitor of protein synthesis. Using radioautography DNA synthesis was investigated in mono-, homo- and heterodikaryons. After short (0.5-3.0 h) depressing of protein synthesis, the nuclei of stimulated cells in heterokaryons were found to enter into S-period. Under these conditions no induction of DNA synthesis was found in the nuclei of resting cells in heterodikaryons. In other experiments, resting cells were under the effect of cycloheximide during 2-4 h before the fusion, that led to a great induction of DNA synthesis in the nuclei of these cells in heterodikaryons. The data obtained are consistent with the idea of fibroblast transition to the rest under the action of labile proteins-repressors.
authors.forename: N A
authors.initials: NA
authors.lastname: Setkov
authors.forename: V N
authors.initials: VN
authors.lastname: Kazakov
authors.forename: T V
authors.initials: TV
authors.lastname: Andreeva
mesh_terms: D016475:3T3 Cells / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D001345:Autoradiography; D002459:Cell Fusion; D002467:Cell Nucleus / Q000187:drug effects* / Q000378:metabolism; D003513:Cycloheximide / Q000494:pharmacology*; D006822:Hybrid Cells / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D016196:S Phase / Q000187:drug effects*; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium
chemical_list: D014316:Tritium; D003513:Cycloheximide; D013936:Thymidine
vernacular_title: Vliianie tsiklogeksimida na vstuplenie v S-period iader v geterodikarionakh.