9-(6-Amino-3-pyridinyl)-1-[3-(trifluoromethyl)phenyl]benzo[h]-1,6-naphthyridin-2(1H)-one

Torin 2 is a potent and selective mTOR inhibitor with IC50 of 0.25 nM in p53?/? MEFs cell line; 800-fold greater selectivity for mTOR than PI3K and improved pharmacokinetic properties. Inhibition of ATM/ATR/DNA-PK with EC50 of 28 nM/35 nM/118 nM,in PC3 cell lines respectively.

Torin 2 has the same binding mode as PI3Kγ, V882 serves as a hinge binding point and in the inner hydrophobic pocket Y867, D841 and D964 provide three more hydrogen bonds with aminopyridine side chain analogous to Y2225, D2195 and D2357 of mTOR. Torin 2 inhibits mTORC1, thus activates TFEB by promoting its nuclear translocation with EC50 of 1.666 mM. Torin 2(< 50 nM) causes a significant reduction in viability of both MZ-CRC-1 and TT cells. Torin 2 (100 nM) exerts a significant reduction of migration of both MZ-CRC-1 and TT cells.

Torin 2 exhibits >95% pharmacodynamic response and half-time of 11.7 min in the mouse liver microsome stability study. Torin 2 exhibits the best bioavailability (51%), short half-life (0.72 hours) and low clearance(19.6 mL/min/kg) in male Swiss albino mice following intravenous and oral administration. Torin 2(20mg/kg) ablates MYCN tumors with reduction in MYCN protein levels and induction of apoptosis in Th-MYCN mice.

Torin 2 is a potent and selective inhibitor of cellular mTOR activity (EC₅₀ = 0.3 nM). It shows more than 800-fold selectivity for mTOR over PI3K (EC₅₀ = 200 nM) and greater than 100-fold binding selectivity relative to 440 other protein kinases. Torin 2 has significantly improved bioavailability (54%), metabolic stability, and plasma exposure compared to torin 1 .

Torin 2 is a potent, selective, and orally available mammalian target of rapamycin (mTOR) inhibitor for treatment of cancer.

Torin2 has been used:

• to examine its effect on LC3B-II levels in BORCS5- KO cells
• to determine its potent activity (IC₅₀?less than 1 μM) against A2780-cis ovarian cancer cells
• in western blot analysis

ChEBI: Torin 2 is a member of the class of pyridoquinolines that is benzo[h][1,6]naphthyridin-2-one carrying additional 3-(trifluoromethyl)phenyl and 6-aminopyridin-3-yl substituents at positions 1 and 9 respectively. It is a potent inhibitor of mTOR and exhibits anti-cancer properties. It has a role as a mTOR inhibitor and an antineoplastic agent. It is an organofluorine compound, a pyridoquinoline, an aminopyridine and a primary amino compound.

Torin2 is a highly potent and selective ATP-competitive mTOR inhibitor. Torin2 has an IC50 of 0.25 nM and 800-fold greater selectivity for mTOR than PI3K.

Store at +4°C

[1] liu q, wang j, kang s a, et al. discovery of 9-(6-aminopyridin-3-yl)-1-(3-(trifluoromethyl) phenyl) benzo [h][1, 6] naphthyridin-2 (1 h)-one (torin2) as a potent, selective, and orally available mammalian target of rapamycin (mtor) inhibitor for treatment of cancer. journal of medicinal chemistry, 2011, 54(5): 1473-1480.