Target therapy directed against the PI3K/AKT/mTOR pathway represents a novel treatment strategy for bladder cancer management. We characterized the regulation of S6K1 and 4EBP1 following PI3K or mTOR inhibition in bladder cancer. Inhibition of PI3K or mTOR resulted in only S6K1 but not 4EBP1 dephosphorylation. Combined inhibition of both, PI3K and mTOR, was required to dephosphorylate 4EBP1, which correlated with a 30 percent greater reduction in cell viability than mono therapy. Our results reveal a novel mechanism of regulation of 4EBP1 activity, that is both PI3K and mTOR dependent.
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Target therapy directed against the PI3K/AKT/mTOR pathway represents a novel treatment strategy for bladder cancer management. We characterized the regulation of S6K1 and 4EBP1 following PI3K or mTOR inhibition in bladder cancer. Inhibition of PI3K or mTOR resulted in only S6K1 but not 4EBP1 dephosphorylation. Combined inhibition of both, PI3K and mTOR, was required to dephosphorylate 4EBP1, which correlated with a 30 percent greater reduction in cell viability than mono therapy. Our results rev...
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