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- W2024134119 startingPage "5749" @default.
- W2024134119 abstract "Tumor progression is coincident with mechanochemical changes in the extracellular matrix (ECM). We hypothesized that tumor stroma stiffening, alongside a shift in the ECM composition from a basement membrane-like microenvironment toward a dense network of collagen-rich fibers during tumorigenesis, confers resistance to otherwise powerful chemotherapeutics. To test this hypothesis, we created a high-throughput drug screening platform based on our poly(ethylene glycol)-phosphorylcholine (PEG-PC) hydrogel system, and customized it to capture the stiffness and integrin-binding profile of in vivo tumors. We report that the efficacy of a Raf kinase inhibitor, sorafenib, is reduced on stiff, collagen-rich microenvironments, independent of ROCK activity. Instead, sustained activation of JNK mediated this resistance, and combining a JNK inhibitor with sorafenib eliminated stiffness-mediated resistance in triple negative breast cancer cells. Surprisingly, neither ERK nor p38 appears to mediate sorafenib resistance, and instead, either ERK or p38 inhibition rescued sorafenib resistance during JNK inhibition, suggesting negative crosstalk between these signaling pathways on stiff, collagen-rich environments. Overall, we discovered that β1 integrin and its downstream effector JNK mediate sorafenib resistance during tumor stiffening. These results also highlight the need for more advanced cell culture platforms, such as our high-throughput PEG-PC system, with which to screen chemotherapeutics." @default.
- W2024134119 created "2016-06-24" @default.
- W2024134119 creator A5005070028 @default.
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- W2024134119 creator A5051251433 @default.
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- W2024134119 date "2014-07-01" @default.
- W2024134119 modified "2023-10-18" @default.
- W2024134119 title "Sorafenib resistance and JNK signaling in carcinoma during extracellular matrix stiffening" @default.
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- W2024134119 doi "https://doi.org/10.1016/j.biomaterials.2014.03.058" @default.
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- W2024134119 hasPublicationYear "2014" @default.
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