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It has been shown that mammalian target of rapamycin (mTOR) inhibitors activate Akt while inhibiting mTOR signaling. However, the underlying mechanisms and the effect of the Akt activation on mTOR-targeted cancer therapy are unclear. The present work focused on addressing the role of mTOR/rictor in mTOR inhibitor-induced Akt activation and the effect of sustained Akt activation on mTOR-targeted cancer therapy. Thus, we have shown that mTOR inhibitors increase Akt phosphorylation through a mechanism independent of mTOR/rictor because the assembly of mTOR/rictor was inhibited by mTOR inhibitors and the silencing of rictor did not abrogate mTOR inhibitor-induced Akt activation. Moreover, Akt activation during mTOR inhibition is tightly associated with development of cell resistance to mTOR inhibitors. Accordingly, cotargeting mTOR and phosphatidylinositol 3-kinase/Akt signaling prevents mTOR inhibition-initiated Akt activation and enhances antitumor effects both in cell cultures and in animal xenograft models, suggesting an effective cancer therapeutic strategy. Collectively, we conclude that inhibition of the mTOR/raptor complex initiates Akt activation independent of mTOR/rictor. Consequently, the sustained Akt activation during mTOR inhibition will counteract the anticancer efficacy of the mTOR inhibitors.

cancer research

Enhancing Mammalian Target of Rapamycin (mTOR)–Targeted Cancer Therapy by Preventing mTOR/Raptor Inhibition-Initiated, mTOR/Rictor-Independent Akt Activation