Add time:07/24/2019 Source:sciencedirect.com
The MAP kinase (Ras/MEK/ERK) and PI3K/Akt/mTOR oncogenic signaling pathways are central regulators of KRAS-mediated transformation. Molecular reciprocity between the Ras/MEK/ERK and PI3K/Akt/mTOR pathways provides cancer cells with the ability to evade treatment when targeting only one pathway with monotherapy. Multi-kinase targeting was explored through the development of a single bivalent chemical entity by covalent linking of high-affinity MEK and PI3K inhibitors. A prototype dual-acting agent (compound 8) designed using the PI3K inhibitor ZSTK474 and the Raf/MEK inhibitor RO5126766 as scaffolds displayed high in vitro inhibition of both PI3K (IC50 = 172 nM) and MEK1 (IC50 = 473 nM). Additionally, compound 8 demonstrated significant modulation of MEK and PI3K signaling pathway activity in human A549 human lung adenocarcinoma cells and pancreatic cancer cells (PANC-1) and also decreased cellular viability in these two cell lines.
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