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Torin 1, a tricyclic benzonaphthyridinone, is a potent and selective inhibitor of the mammalian target of rapamycin (mTOR) kinase, which is the catalytic subunit of two functionally distinct complexes and plays a pivotal role in the regulation of cell growth, proliferation and survival. Torin 1 directly inhibits the two mTOR-containing complexes, mTORC1 and mTORC2, through an ATP-competitive mechanism with half maximal inhibitory concentration IC50 of 2 nM and 10 nM respectively. Torin 1 has been found to impair cell growth and proliferation through a mechanism involving mTORC1 inhibition other than mTORC2 inhibition, in which the rapamycin-resistant functions of mTORC1 is suppressed.

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