Abstract:
OBJECTIVES:To evaluate the effects of rRNA synthesis inhibition on cell cycle progression and cell population growth according to the RB and p53 status. MATERIAL AND METHODS:RB- and p53-proficient U2OS cells and the RB- and p53-deficient SAOS-2 cells were used, rRNA transcription hindered by actinomycin D, and cell cycle analysed by flow cytometry. RESULTS:One hour of actinomycin D treatment induced in U2OS cells a block at the cell cycle checkpoints G(1)-S and G(2)-M, which was removed only after rRNA synthesis was resumed. rRNA synthesis inhibition did not influence cell cycle progression in SAOS-2 cells. No effect on cell cycle progression after actinomycin D-induced rRNA inhibition was also found in U2OS cells silenced for RB and p53 expression. A mild perturbation of cell cycle progression was observed in U2OS cells silenced for the expression of either RB or p53 alone. We also treated U2OS and SAOS-2 cells with actinomycin D for 1 h/day for 5 days. This treatment lightly reduced growth rate of the U2OS cell population, whereas cell population growth of SAOS-2 cells was completely inhibited. A marked reduction of ribosome content occurred in SAOS-2 cells after the long-term actinomycin D treatment, whereas no modification was observed in U2OS cells. CONCLUSIONS:These results demonstrate that inhibition of ribosome biogenesis does not hinder cell cycle progression in RB- and p53-deficient cells. A daily-repeated transitory inhibition of ribosome biogenesis leads to a progressive reduction of ribosome content with the consequent extinction of cancer cell population lacking RB and p53.
journal_name
Cell Prolifjournal_title
Cell proliferationauthors
Montanaro L,Mazzini G,Barbieri S,Vici M,Nardi-Pantoli A,Govoni M,Donati G,Treré D,Derenzini Mdoi
10.1111/j.1365-2184.2007.00448.xsubject
Has Abstractpub_date
2007-08-01 00:00:00pages
532-49issue
4eissn
0960-7722issn
1365-2184pii
CPR448journal_volume
40pub_type
杂志文章abstract::Triple-negative breast cancer (TNBC) is one of the most aggressive subtypes of breast cancer with negativity for oestrogen receptor (ER), progesterone receptor (PR) and human epidermal growth factor receptor (HER2). Non-coding RNAs (ncRNAs) make up most of the transcriptome and are widely present in eukaryotic cells. ...
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journal_title:Cell proliferation
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journal_title:Cell proliferation
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更新日期:2018-08-01 00:00:00
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