LJI308

LJI308 is a potent pan-ribosomal S6 kinase (RSK) inhibitor, with IC50s of 6 nM, 4 nM, and 13 nM for RSK1, RSK2, and RSK3, respectively. LJI308 inhibits the phosphorylation of RSK (T359/S363) and YB-1 (S102) after irradiation, treatment with EGF, and in cells expressing a KRAS mutation.

Product information

CAS Number: 1627709-94-7

Molecular Weight: 368.38

Formula: C21H18F2N2O2

Chemical Name: 2, 6-difluoro-4-{4-[4-(morpholin-4-yl)phenyl]pyridin-3-yl}phenol

Smiles: OC1C(F)=CC(=CC=1F)C1=CN=CC=C1C1C=CC(=CC=1)N1CCOCC1

InChiKey: YUYJEQHNWKQNBT-UHFFFAOYSA-N

InChi: InChI=1S/C21H18F2N2O2/c22-19-11-15(12-20(23)21(19)26)18-13-24-6-5-17(18)14-1-3-16(4-2-14)25-7-9-27-10-8-25/h1-6,11-13,26H,7-10H2

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMSO : 25 mg/mL (67.86 mM; Need ultrasonic)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 ^oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥360 days if stored properly.

Stock Solution Storage: 0 - 4 ^oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

LJI308 inhibits S6K1 with an IC50 of 0.8 μM. LJI308 inhibits YB-1 phosphorylation in CRC cells at concentrations of 5 to 25 μM. In a dose kinetics experiment, LJI308, starting at 2.5 μM, inhibits YB-1 phosphorylation in the KRAS mutated TNBC cell line MDA-MB-231 by approximately 86%. LJI308 effectively blocks RSK and YB-1 phosphorylation after EGF stimulation and after irradiation in KRAS wild-type HBL-100 cells. LJI308 (1-10 μM; 96 hours) decreases cell viability by up to 90%.

References:

1. Aronchik I, et al. Novel potent and selective inhibitors of p90 ribosomal S6 kinase reveal the heterogeneity of RSK function in MAPK-driven cancers. Mol Cancer Res. 2014 May;12(5):803-12.
2. Lettau K, et al. Simultaneous Targeting of RSK and AKT Efficiently Inhibits YB-1-Mediated Repair of Ionizing Radiation-Induced DNA Double-Strand Breaks in Breast Cancer Cells. Int J Radiat Oncol Biol Phys. 2021;109(2):567-580.
3. Davies AH, et al. Inhibition of RSK with the novel small-molecule inhibitor LJI308 overcomes chemoresistance by eliminating cancer stem cells. Oncotarget. 2015;6(24):20570-20577.

Products are for research use only. Not for human use.