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Targeting RNA Polymerase I With Hernandonine Inhibits Ribosomal RNA Synthesis And Tumor Cell Growth

Yenting Chen, Jih-Jung Chen, Hsiang-Tsui Wang
Published 2019 · Biology, Medicine
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RNA polymerase I (RNA Pol. I) activity is consistently expanded in multiplying cells to continue the expanded interest for ribosome generation and protein synthesis, which are fundamental for cell development and division. Thus, selective inhibitors of RNA Pol. I may offer a general helpful intends to block cancer cell multiplication. Hernandonine, isolated from the root wood of Hernandia nymphaeifolia, causes rearrangement of nucleolar proteins consistent with segregation of the nucleolus, a hallmark of RNA Pol. I transcription stress. Furthermore, the compound destabilizes RPA194, the large catalytic protein of RNA Pol. I, in a proteasome-dependent manner and inhibits nascent rRNA synthesis and expression of the 45S rRNA precursor. Finally, hernandonine induces cellular apoptosis through a p53-dependent or p53-independent process in solid tumor cell lines. These outcomes feature the prevailing effect of RNA Pol. I transcription stress on apoptosis pathway initiation and present a synthetically novel and significant molecule that represses RNA Pol. I, making it a potential objective for malignancy treatment. Implications: Our findings position hernandonine as a potential, particular, and orally administered cancer treatment agent appropriate for use in investigational clinical trials.
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