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• W1994161703 endingPage "439" @default.
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• W1994161703 abstract "Androgen-dependent growth of prostate tissue has been well documented. An additional prerequisite for cellular growth is the accumulation of ribosomes. It is thus reasonable to hypothesize that ribosomal DNA (rDNA) transcription in prostate tissue must be stimulated by androgen either directly or indirectly. This hypothesis was tested using both LNCaP cells, an androgen-dependent tissue culture line and in a rat animal model. Nuclear run-on assays confirmed that the administration of DHT to LNCaP cells resulted in a two- to three-fold increase in the rate of rRNA synthesis when compared to cells maintained in the absence of androgen. Enzymatic analysis and Western blots were carried out to measure the amount (activity and mass) of RNA polymerase I in DHT treated LNCaP cells. These assays demonstrated that neither the catalytic activity of RNA polymerase I nor the amount of the enzyme varied in response to DHT. However, Western blots revealed that the amount of the auxiliary RNA polymerase I transcription factor UBF, was significantly increased (two- to three-fold) in cells grown in the presence of DHT. Similar experiments were carried out with prostatic tissue obtained from orchiectomized rats maintained on either placebo or testosterone pellets. In this model, both the catalytic activity as well as the amount of RNA polymerase I protein decreased. However, in agreement with the tissue culture model, UBF protein decreased in prostates from orchiectomized rats and was maintained in animals supplemented with testosterone. These lines of evidence are consistent with the hypothesis that androgens stimulate rRNA synthesis by increasing the quantities of the components of the rDNA transcription system." @default.
• W1994161703 created "2016-06-24" @default.
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• W1994161703 date "1996-12-01" @default.
• W1994161703 modified "2023-10-16" @default.
• W1994161703 title "Androgen regulation of ribosomal RNA synthesis in LNCaP cells and rat prostate" @default.
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• W1994161703 doi "https://doi.org/10.1016/s0960-0760(96)00126-4" @default.
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