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- W3205683686 abstract "Hyperactivity of serine-threonine kinase AKT is one of the most common molecular abnormalities in cancer, where it contributes to poor outcomes by facilitating the growth and survival of malignant cells. Despite its well-documented anti-apoptotic effects, hyperactivity of AKT is also known to be stressful to a cell. In an attempt to better elucidate this phenomenon, we observed the signs of proteotoxic stress in cells that harbor hyperactive AKT or have lost its principal negative regulator, PTEN. The activity of HSF1 was predictably elevated under these circumstances. However, such cells proved more sensitive to various regimens of heat shock, including the conditions that were well-tolerated by syngeneic cells without AKT hyperactivity. The sensitizing effect of hyperactive AKT was also seen in HSF1-deficient cells, suggesting that the phenomenon does not require the regulation of HSF1 by this kinase. Notably, the elevated activity of AKT was accompanied by increased levels of XBP1, a key component of cell defense against proteotoxic stress. Interestingly, the cells harboring hyperactive AKT were also more dependent on XBP1 for their growth. Our observations suggest that proteotoxic stress conferred by hyperactive AKT represents a targetable vulnerability, which can be exploited by either elevating the stress above the level tolerated by such cells or by eliminating the factors that enable such tolerance." @default.
- W3205683686 created "2021-10-25" @default.
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- W3205683686 creator A5090192709 @default.
- W3205683686 date "2021-10-21" @default.
- W3205683686 modified "2023-10-17" @default.
- W3205683686 title "Proteotoxic Stress as an Exploitable Vulnerability in Cells with Hyperactive AKT" @default.
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- W3205683686 doi "https://doi.org/10.3390/ijms222111376" @default.
- W3205683686 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8583472" @default.
- W3205683686 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34768807" @default.
- W3205683686 hasPublicationYear "2021" @default.
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