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- W2580188387 abstract "Previously we have shown that the inhibition of proliferation and induction of apoptosis in pancreatic ductal adenocarcinoma (PDA) cells by pristimerin (PM), a quinonemethide triterpenoid, was associated with the inhibition of human telomerase reverse transcriptase (hTERT) mRNA and hTERT protein. Herein we show that PM inhibits transcription factors and epigenetic processes that regulate hTERT expression. Treatment with PM inhibited transcription factors c-Myc, Sp1, NF-κB and kinases p-Akt and p-mTOR that regulate hTERT post-translationally. PM also downregulated DNA methyl transferases DNMT1 and DNMT3a and transcriptionally active chromatin markers, such as acetylated histone H3 (Lys9), acetylated histone H4, di-methyl H3 (Lys4) and tri-methyl H3 (Lys9). In addition, chromatin immunoprecipitation (ChIP) analysis showed decrease in c-Myc and Sp1 transcription factors, but not repressive factors CTCF, E2F or Mad1 in the regulatory region of the hTERT promoter after treatment with PM. PM also reduced acetylated histone 3 and 4 and methylated H3 at hTERT promoter. Collectively, these results indicated that PM downregulates hTERT/telomerase through the inhibition of the genetic and epigenetic regulators of hTERT gene expression." @default.
- W2580188387 created "2017-02-03" @default.
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- W2580188387 date "2017-01-23" @default.
- W2580188387 modified "2023-09-30" @default.
- W2580188387 title "Inhibition of hTERT in pancreatic cancer cells by pristimerin involves suppression of epigenetic regulators of gene transcription" @default.
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- W2580188387 doi "https://doi.org/10.3892/or.2017.5400" @default.
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