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• W2023641727 endingPage "167" @default.
• W2023641727 startingPage "161" @default.
• W2023641727 abstract "Administration of estradiol (E2) to ovariectomized mature rats has been shown to result in synthesis of uterine polyamines in the same temporal manner as E2 regulation of nucleolar transcription. Data is presented on the in vivo and in vitro effects of polyamines on uterine nucleolar RNA synthesis. Transcervical intrauterine administration of putrescine (100 micrograms), spermidine (100 micrograms), or spermine (100 micrograms) resulted in an increased transcriptional activity of 93 and 82% in uterine nucleoli isolated from putrescine and spermidine treated animals, respectively. Spermine administration was without effect on uterine nucleolar transcription. The polyamine-induced increase in transcription was totally accounted for by an increased rate of elongation of previously initiated RNA chains. No effect on the number of nucleolar RNA chains in the act of synthesis was observed. Preincubation of uterine nucleoli, isolated from control animals (no E2) with putrescine, spermidine, or spermine in the presence, but not in the absence of ATP, resulted in 44, 83 and 31% increased nucleolar RNA synthesis, respectively. In vitro polyamine-induced nucleolar RNA synthesis was correlated with a polyamine activated phosphorylation of nucleolar proteins of 110,000 24,000, 18,000 and 14,000 Da. Results suggest that early E2 action may result in activation of the polyamine pathway which modulates nucleolar protein kinase activity; initiating an increase in nucleolar transcription." @default.
• W2023641727 created "2016-06-24" @default.
• W2023641727 creator A5081465097 @default.
• W2023641727 date "1991-08-01" @default.
• W2023641727 modified "2023-09-26" @default.
• W2023641727 title "Role of polyamine in the regulation of RNA synthesis in uterine nucleoli" @default.
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• W2023641727 doi "https://doi.org/10.1016/0960-0760(91)90057-c" @default.
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