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- W2096514882 abstract "Acquired chemoresistance and epithelial-to-mesenchymal transition (EMT) are hallmarks of cancer progression and of increasing clinical relevance. We investigated the role of miRNA and p38 mitogen-activated protein kinase (MAPK) signaling in the progression of breast cancer to a drug-resistant and mesenchymal phenotype. We demonstrate that acquired death receptor resistance results in increased hormone-independent tumorigenesis compared to hormone-sensitive parental cells. Utilizing global miRNA gene expression profiling, we identified miRNA alterations associated with the development of death receptor resistance and EMT progression. We further investigated the role of p38 MAPK in this process, showing dose-dependent inactivation of p38 by its inhibitor RWJ67657 and decreased downstream ATF and NF‑κB signaling. Pharmacological inhibition of p38 also decreased chemoresistant cancer tumor growth in xenograft animal models. Interestingly, inhibition of p38 partially reversed the EMT changes found in this cell system, as illustrated by decreased gene expression of the EMT markers Twist, Snail, Slug and ZEB and protein and mRNA levels of Twist, a known EMT promoter, concomitant with decreased N‑cadherin protein. RWJ67657 treatment also altered the expression of several miRNAs known to promote therapeutic resistance, including miR‑200, miR‑303, miR‑302, miR‑199 and miR‑328. Taken together, our results demonstrate the roles of multiple microRNAs and p38 signaling in the progression of cancer and demonstrate the therapeutic potential of targeting the p38 MAPK pathway for reversing EMT in an advanced tumor phenotype." @default.
- W2096514882 created "2016-06-24" @default.
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- W2096514882 date "2013-02-08" @default.
- W2096514882 modified "2023-10-18" @default.
- W2096514882 title "Inhibition of p38 mitogen-activated protein kinase alters microRNA expression and reverses epithelial-to-mesenchymal transition" @default.
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- W2096514882 doi "https://doi.org/10.3892/ijo.2013.1814" @default.
- W2096514882 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3622654" @default.
- W2096514882 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23403951" @default.
- W2096514882 hasPublicationYear "2013" @default.