Molecular Weight(MW): 308.34
Torkinib (PP242) is a selective mTOR inhibitor with IC50 of 8 nM in cell-free assays; targets both mTOR complexes with >10- and 100-fold selectivity for mTOR than PI3Kδ or PI3Kα/β/γ, respectively.
Cited by 15 Publications
7 Customer Reviews
MTORC1 regulates the subcellular distribution of TFEB. Immunofluorescence confocal microscopy showing nuclear localization of recombinant TFEB-Flag in ARPE-19 cells incubated with MTORC1 inhibitors (PP242, LY294002, Wortmannin).
Autophagy 2012 8(6), 903-14. Torkinib (PP242) purchased from Selleck.
AKT protein kinase activity controls protein synthesis by regulating the multistep process of mRNA translation at multiple stages from ribosome biogenesis to translation initiation and elongation. PC3-LN4 cells were treated with GSK690693 (5 uM) alone, or in combination with PP242 (2 uM) or AZD8055 (1 uM) for 24 h, and immunoblotting performed.
Cancer Res 2013 73(11), 3402-11. Torkinib (PP242) purchased from Selleck.
Synergistic effect of BMS-777607 with mTOR inhibitors in reduction of CSCs+24/44/ESA viability. CSCs+24/44/ESA at 5,000 cells per well with stem cell culture media in triplicate in an ultra-low adhesion plate were treated with 5 umol/L BMS-777607, 1 umol/L AZD8055, 1 umol/L RAD001, and 1 umol/L PP242 alone, or in their different combinations. Cells were cultured for 72 hours. Percentages of polyploid cells were determined by counting 300 cells from two different regions. Results shown here were from one of two experiments with similar results.
Mol Cancer Ther 2014 13(1), 37-48. Torkinib (PP242) purchased from Selleck.
HeLa cells were treated with MK2206 (1 uM), rapamycin (Rapa; 100 nM), PP242 (1 uM), BEZ235 (0.5 uM), U0126 (U0; 15 uM), BI-D1870 (BI; 10 uM), GNE-652 (1 uM), AZD1208 (3 uM), and the indicated inhibitor combinations for 3 h. Cell lysates were analyzed by immunoblot assays using indicated antibodies.
Mol Cell Biol 2014 34(13), 2517-32. Torkinib (PP242) purchased from Selleck.
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Choose Selective mTOR Inhibitors
|Description||Torkinib (PP242) is a selective mTOR inhibitor with IC50 of 8 nM in cell-free assays; targets both mTOR complexes with >10- and 100-fold selectivity for mTOR than PI3Kδ or PI3Kα/β/γ, respectively.|
|Features||One of the first selective inhibitors that targets ATP domain of mTOR.|
PP242 exhibits potent selectivity for mTOR over other PI3K family kinases such as p110α, p110β, p110γ, p110δ, and DNA-PK with IC50 of 1.96 μM, 2.2 μM, 1.27 μM, 0.102 μM, and 0.408 μM, respectively. PP242 displays some inhibitory activity against Ret, PKCα, PKCβ, and JAK2, while exhibits remarkable selectivity against 215 other protein kinases. Unlike rapamycin, PP242 inhibits both mTORC1 and mTORC2. In BT549 cells, PP242 treatment (0.04-10 μM) inhibits the phosphorylation of Akt, the mTOR substrate p70S6K, and its downstream target S6 in a dose-dependent manner.  PP242 potently inhibits PKCα with IC50 of 49 nM. Low concentrations of PP242 inhibit the phosphorylation of Akt S473 and higher concentrations partially inhibit Akt T308-P in addition to S473-P. As PP242 is a more effective mTORC1 inhibitor than rapamycin, PP242 inhibits the proliferation of primary MEFs, and the phosphorylation of 4EBP1 at T36/45 and S65, more potently than rapamycin. PP242 but not rapamycin potently inhibits cap-dependent translation, by causing a higher level of binding between 4EBP1 and eIF4E than rapamycin.  PP242 potently inhibits the proliferation of p190-transformed murine BM, SUP-B15, and K562 cells with GI50 of 12 nM, 90 nM, and 85 nM, respectively. PP242 also inhibits the growth of solid tumor cell lines such as SKOV3, PC3, 786-O, and U87 with GI50 of 0.49 μM, 0.19 μM, 2.13 μM, and 1.57 μM, respectively.  PP242 is also more effective than rapamycin in achieving cytoreduction and apoptosis in multiple myeloma (MM) cells. 
|In vivo||Administration of PP242 is able to completely inhibit the phosphorylation of Akt at S473 and T308 in fat and liver of mice. PP242 only partially inhibits the phosphorylation of Akt in skeletal muscle and is more effective at inhibiting the phosphorylation of T308 than S473, despite able to fully inhibit the phosphorylation of 4EBP1 and S6.  Oral administration PP242 potently delays the leukemia onset in the mice model, and induces leukemia regression by inhibiting mTORC2 and mTORC1 activation that correlates with loss in cell size.  PP242 treatment potently inhibits the growth of 8226 cells in mice. |
In vitro mTOR (FRAP1) kinase assay:Recombinant mTOR is incubated with PP242 at 2-fold dilutions over a concentration range of 50-0.001 μM in an assay containing 50 mM HEPES, pH 7.5, 1 mM EGTA, 10 mM MgCl2, 0.01% Tween, 10 μM ATP (2.5 μCi of γ-32P-ATP), and 3 μg/mL BSA. Rat recombinant PHAS-1/4EBP1 (2 mg/mL) is used as a substrate. Reactions are terminated by spotting onto nitrocellulose, which is washed with 1 M NaCl/1% phosphoric acid (approximately 6 times, 5-10 minutes each). Sheets are dried and the transferred radioactivity quantitated by phosphorimaging. IC50 value is calculated by fitting the data to a sigmoidal dose-response curve using the Prism software package.
|In vitro||DMSO||62 mg/mL (201.07 mM)|
|Ethanol||18 mg/mL (58.37 mM)|
|In vivo||2% DMSO+30% PEG 300+5% Tween 80+ddH2O||5mg/mL|
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