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• W3179409149 endingPage "1448" @default.
• W3179409149 startingPage "1439" @default.
• W3179409149 abstract "The nucleolus of a cell is a critical cellular compartment that is responsible for ribosome biogenesis and plays a central role in tumor progression. Fisetin, a nutraceutical, is a naturally occurring flavonol from the flavonoid group of polyphenols that has anti-cancer effects. Fisetin negatively impacts several signaling pathways that support tumor progression. However, effect of fisetin on the nucleolus and its functions were unknown. We observed that fisetin is able to physically enter the nucleolus. In the nucleolus, RNA polymerase I (RNA Pol I) mediates the biogenesis of ribosomal RNA. Thus, we investigated the impacts of fisetin on the nucleolus. We observed that breast tumor cells treated with fisetin show a 20–30% decreased nucleolar abundance per cell and a 30–60% downregulation of RNA Pol I transcription activity, as well as a 50–70% reduction in nascent rRNA synthesis, depending on the cell line. Our studies show that fisetin negatively influences MAPK/ERK pathway to impair RNA Pol I activity and rRNA biogenesis. Functionally, we demonstrate that fisetin acts synergistically (CI = 0.4) with RNA Pol I inhibitor, BMH-21 and shows a noteworthy negative impact (60% decrease) on lung colonization of breast cancer cells. Overall, our findings highlight the potential of ribosomal RNA (rRNA) biogenesis as a target for secondary prevention and possible treatment of metastatic disease. Fisetin, a natural flavanol, can localize to the nucleolus and decrease rRNA biogenesis. It preferentially targets tumorigenic cells and cells with cancer stem-like properties. In combination with the RNA Pol I inhibitor BMH-21, it synergistically inhibits pulmonary metastasis, making this combination an exciting potential therapeutic strategy." @default.
• W3179409149 created "2021-07-19" @default.
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• W3179409149 date "2021-11-01" @default.
• W3179409149 modified "2023-10-13" @default.
• W3179409149 title "Novel role of the dietary flavonoid fisetin in suppressing rRNA biogenesis" @default.
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• W3179409149 doi "https://doi.org/10.1038/s41374-021-00642-1" @default.
• W3179409149 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8510891" @default.
• W3179409149 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36775470" @default.
• W3179409149 hasPublicationYear "2021" @default.

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