For research use only.

Catalog No.S7871

2 publications

LJI308 Chemical Structure

Molecular Weight(MW): 368.38

LJI308 is a potent, and pan-RSK (p90 ribosomal S6 kinase) inhibitor with IC50 of 6 nM, 4 nM, and 13 nM for RSK1, RSK2, and RSK3, respectively.

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Biological Activity

Description LJI308 is a potent, and pan-RSK (p90 ribosomal S6 kinase) inhibitor with IC50 of 6 nM, 4 nM, and 13 nM for RSK1, RSK2, and RSK3, respectively.
RSK2 [1] RSK1 [1] RSK3 [1]
4 nM 6 nM 13 nM
In vitro

In MDA-MB-231 and H358 cells, LJI308 blocks cellular inhibition of RSK and its phosphorylation of YB1 on Ser102 with EC50 of 0.2–0.3 μM, and thus inhibits cell growth. [1] In TNBC HTRY-LT cells, LJI308 also suppresses cell growth correlative with YB-1 inhibition. [2]


Kinase Assay:


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Inhibition of RSK1, RSK2, and RSK3 activity:

Enzymatic activity of RSK isoforms 1, 2, and 3 is assessed using recombinant full-length RSK protein. RSK1 (1 nM), RSK2 (0.1 nM), or RSK3 (1 nM) is allowed to phosphorylate 200 nM peptide substrate (biotin-AGAGRSRHSSYPAGT-OH) in the presence of ATP at concentration equal to the Km for ATP for each enzyme (RSK1- 5 μM, RSK2- 20 μM, RSK3- 10 μM) and appropriate dilutions of RSK inhibitors in 50 mM HEPES, pH 7.5, 10 mM MgCl2, 1 mM DTT, 0.1% BSA Fraction V, 0.01% Tween-20. After 150 min at room temperature, the reaction is stopped with 60 mM EDTA and extent of peptide phosphorylation was determined using an anti-phospho-AKT substrate antibody and AlphaScreen reagents as described by the manufacturer.
Cell Research:


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  • Cell lines: MDA-MB-231 and H358 cells
  • Concentrations: ~100 μM
  • Incubation Time: 72 h
  • Method:

    Cell growth under attached conditions is assessed by plating 1000 cells per well on 96-well tissue culture-treated plates in cell growth medium. Appropriate dilutions of compound are 4 added medium above cells and cell growth was assessed after 72 hrs by addition of CellTiter Glo reagent according to manufacturer’s directions.

    (Only for Reference)

Solubility (25°C)

In vitro DMSO 73 mg/mL warmed (198.16 mM)
Water Insoluble
Ethanol Insoluble

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 368.38


CAS No. 1627709-94-7
Storage powder
in solvent
Synonyms N/A
Smiles C1COCCN1C2=CC=C(C=C2)C3=C(C=NC=C3)C4=CC(=C(C(=C4)F)O)F

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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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S6 Kinase Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID