R406 (free base)

Catalog No.S1533 Batch:S153302

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Technical Data

Formula

C22H23FN6O5
Molecular Weight 470.45 CAS No. 841290-80-0
Solubility (25°C)* In vitro DMSO 29 mg/mL (61.64 mM)
Water Insoluble
Ethanol Insoluble
* <1 mg/ml means slightly soluble or 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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

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.
Targets
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]

Protocol (from reference)

Kinase Assay:

[1]
  • 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 Assay:

[2]
  • 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.
Animal Study:

[1]
  • 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)

Customer Product Validation

Data from [Clin Cancer Res, 2013, 19(3), 586-597]

Data from [Data independently produced by , , Mol Neurobiol, 2018, doi: 10.1007/s12035-018-1135-4]

Selleck's R406 (free base) has been cited by 104 publications

Loss of NF1 in Melanoma Confers Sensitivity to SYK Kinase Inhibition [ Cancer Res, 2023, 83(2):316-331] PubMed: 36409827
Identification of new drugs to counteract anti-spike IgG-induced hyperinflammation in severe COVID-19 [ Life Sci Alliance, 2023, 6(11)e202302106] PubMed: 37699657
Interleukin 33-mediated inhibition of A-type K+ channels induces sensory neuronal hyperexcitability and nociceptive behaviors in mice [ Theranostics, 2022, 12(5):2232-2247] PubMed: 35265208
B-cell antigen receptor expression and phosphatidylinositol 3-kinase signaling regulate genesis and maintenance of mouse chronic lymphocytic leukemia [ Haematologica, 2022, 107(8):1796-1814] PubMed: 35021605
Polyaniline-Based Glyco-Condensation on Au Nanoparticles Enhances Immunotherapy in Lung Cancer [ ACS Appl Mater Interfaces, 2022, 14(21):24144-24159] PubMed: 35579575
Spleen tyrosine kinase regulates keratinocyte inflammasome activation and skin inflammation induced by UVB irradiation [ Free Radic Biol Med, 2022, S0891-5849(22)00004-1] PubMed: 35007704
Microbial Protein Binding to gC1qR Drives PLA2G1B-Induced CD4 T-Cell Anergy [ Front Immunol, 2022, 13:834988] PubMed: 35309299
Syk Facilitates Influenza A Virus Replication by Restraining Innate Immunity at the Late Stage of Viral Infection [ J Virol, 2022, e0020022] PubMed: 35293768
ETV2 regulates PARP-1 binding protein to induce ER stress-mediated death in tuberin-deficient cells [ Life Sci Alliance, 2022, 5(5)e202201369] PubMed: 35181635
The miR-26 family regulates early B cell development and transformation [ Life Sci Alliance, 2022, 5(8)e202101303] PubMed: 35459737

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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