R406 (free base)

For research use only.

Catalog No.S1533

84 publications

R406 (free base) Chemical Structure

CAS No. 841290-80-0

R406 (free base) is a potent Syk inhibitor with IC50 of 41 nM in a cell-free assay, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. R406 (free base) triggers apoptosis. Phase 1.

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Selleck's R406 (free base) has been cited by 84 publications

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Biological Activity

Description R406 (free base) is a potent Syk inhibitor with IC50 of 41 nM in a cell-free assay, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. R406 (free base) triggers apoptosis. Phase 1.
FLT3 [1]
Syk [1]
(Cell-free assay)
41 nM
In vitro

R406 is an ATP-competitive inhibitor of Syk with a Ki value of 30 nM. R406 selectively inhibits Syk-dependent signaling with EC50 values ranging from 33 nM to 171 nM, more potently than Syk-independent pathways in different cells. [1] R406 inhibits cellular proliferation of a large panel of diffuse large B-cell lymphoma (DLBCL) cell lines at EC50 values ranging from 0.8 μM to 8.1 μM. R406 treatment (1 μM or 4 μM) induces the activation of caspases 9 and 3, but not caspase 8, leading to significant apoptosis of the majority of DLBCL cell lines. Pretreatment of R406 completely blocks the phosphorylation of SYK525/526 and the SYK-dependent phosphorylation of BLNK in R406-sensitive DLBCLs following B-cell receptor (BCR) crosslinking. [2] R406 potently decreases MMP-9 mRNA levels by 2.8- and 4.3-fold lower than controls after 24 and 48 hours treatment, respectively, and reduces the invasive capacity of the RL cells. [3]

In vivo R406 has shown efficacy in a number of animal models of immune disorders. Oral administration of R406 in mice with immune complex-mediated inflammation significantly inhibits the cutaneous reverse passive Arthus reaction by approximately 72% and 86% at 1 mg/kg and 5 mg/kg, respectively, compared with the control. R406 treatment at 10 mg/kg significantly reduces inflammation and swelling, decreases the progressive arthritis to a lower level in the passive anticollagen antibody-challenged mice, and delays the onset and reduces paw thickening and clinical arthritis by approximately 50% in the K/BxN serum transfer mice model. [1]


Kinase Assay:


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In-vitro Fluorescence Polarization Kinase Assays:

R406 is serially diluted in DMSO and then diluted to 1% DMSO in kinase buffer (20 mM HEPES, pH 7.4, 5 mM MgCl2, 2 mM MnCl2, 1 mM DTT, 0.1 mg/mL acetylated BGG). ATP and substrate in kinase buffer are added at room temperature, resulting in a final DMSO concentration on 0.2%. The kinase reactions are performed in a final volume of 20 μL containing 5 μM HS1 peptide substrate and 4 μM ATP and started by addition of 0.125 ng of Syk in kinase buffer. The reaction is allowed to proceed for 40 minutes at room temperature. The reaction is stopped by the addition of 20 μL of PTK quench mix containing EDTA/anti-phosphotyrosine antibody (1X final)/fluorescent phosphopeptide tracer (0.5X final) diluted in FP Dilution Buffer. The plate is incubated for 30 minutes in the dark at room temperature and then read on a Polarion fluorescence polarization plate reader. Data are converted to amount of phosphopeptide present using a calibration curve generated by competition with the phosphopeptide competitor provided in the Tyrosine Kinase Assay Kit. For IC50 determination, R406 is tested at eleven concentrations in duplicate and curve-fitting is performed by non-linear regression analysis using Prism GraphPad Software.
Cell Research:


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  • Cell lines: DHL4, DHL6, DHL8, DHL10, Wsu-NHL, Karpas422 (K422), OCI LY1, LY3, LY4, LY7, LY10, LY18, LY19, Pfeiffer, and Toledo
  • Concentrations: Dissolved in DMSO at a concentration of 10 mM, final concentrations ~ 5 μM
  • Incubation Time: 72 or 96 hours
  • Method:

    DLBCL cell lines are treated with serial dilutions of R406 (0.3, 0.6, 1.25, 2.5, or 5 μM) for 72 or 96 hours. Thereafter, cellular proliferation is determined by MTT assay, and cell apoptosis is assessed by using annexin V–FITC/propidium iodide (PI) staining. For the determination of caspase 9, 8, and 3, cells are lysed, size-fractionated by polyacrylamide gel electrophoresis (PAGE), and immunoblotted.

    (Only for Reference)
Animal Research:


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  • Animal Models: Female C57BL/6 mice challenged intravenously with 1% ovalbumin (OVA) in saline (10 mg/kg) containing 1% Evans blue dye, female Balb/c mice with the anticollagen antibody-induced arthritis, and female C57BL/6 mice with arthritis induced by intraperitoneal
  • Dosages: ~10 mg/kg/day
  • Administration: Orally (prodrug R788)
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 21 mg/mL (44.63 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
1% DMSO+30% polyethylene glycol+1% Tween 80
For best results, use promptly after mixing.
30 mg/mL

* 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 470.45


CAS No. 841290-80-0
Storage powder
in solvent
Synonyms N/A
Smiles CC1(C(=O)NC2=C(O1)C=CC(=N2)NC3=NC(=NC=C3F)NC4=CC(=C(C(=C4)OC)OC)OC)C

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% DMSO % % Tween 80 % ddH2O

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT01725230 Completed Drug: Fostamatinib|Drug: Rosuvastatin|Drug: Simvastatin Rheumatoid Arthritis AstraZeneca November 2012 Phase 1
NCT01598571 Completed Drug: Fostamatinib Healthy AstraZeneca May 2012 Phase 1
NCT01387308 Completed Drug: Fostamatinib Healthy AstraZeneca August 2011 Phase 1
NCT01355354 Completed Drug: Digoxin|Drug: Fostamatinib Healthy Volunteers|Rheumatoid Arthritis AstraZeneca June 2011 Phase 1

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID