title: Macromolecular synthesis and stability in growth-arrested BALB/c-3T3 cells.
abstract: Concentrations of methylglyoxal bis-(guanylhydrazone) (mGBG) that inhibited serum-stimulated BALB/c-3T3 cells in late G1 caused a marked inhibition of 3H-leucine incorporation during a 20-min incubation. No decrease was observed in the incorporation of 3H-uridine during a 20-min incubation; however, the amount of acid-insoluble 3H-uridine in mGBG-treated cultures was decreased when the incubation period was longer than 20 min. The amount of the decrease in the accumulation of incorporated 3H-uridine was directly proportional to the length of the incorporation time. Between 10 and 12 h after quiescent BALB/c-3T3 cells were serum-stimulated in mGBG no additional 3H-uridine was accumulated. The stability of the incorporated 3H-uridine, as determined by acid-insoluble radioactivity remaining after the addition of actinomycin D, was less in cells cultured in mGBG. Exogenous spermine or spermidine reversed the inhibition of 3H-uridine accumulation in acid-insoluble material produced by mGBG as well as the decrease in stability of the incorporated 3H-uridine in acid-insoluble material. The effects of mGBG on both the incorporation of 3H-uridine and the stability of the incorporated 3H-uridine can apparently be accounted for by an effect on ribosomal RNA.
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000187:drug effects; D002478:Cells, Cultured; D003609:Dactinomycin / Q000494:pharmacology; D007399:Interphase / Q000187:drug effects; D051379:Mice; D008935:Mitoguazone / Q000494:pharmacology; D011073:Polyamines / Q000378:metabolism; D012313:RNA / Q000378:metabolism*; D013095:Spermidine / Q000494:pharmacology; D013096:Spermine / Q000494:pharmacology; D013997:Time Factors
chemical_list: D011073:Polyamines; D003609:Dactinomycin; D013096:Spermine; D012313:RNA; D008935:Mitoguazone; D013095:Spermidine