Name: R406 (free base)
Brand: Selleck Chemicals
SKU: S1533
Availability: InStock
Rating: 5 (108 reviews)

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Quality Control

Batch: Purity: 99.95%

99.95

Related Targets	EGFR VEGFR JAK PDGFR FGFR Src HIF FLT FLT3 HER2
Other Syk Inhibitors	R406 PRT062607 (P505-15) HCl Entospletinib (GS-9973) Piceatannol BAY 61-3606 dihydrochloride PRT-060318 2HCl TAK-659 Hydrochloride Lanraplenib (GS-SYK) RO9021 R112

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Incubation Time	Activity Description	PMID
MV411	Function assay		72 hrs	Inhibition of Flt3 in human MV411 cells assessed as assessed as proliferation after 72 hrs incubation by spectrophotometry, EC50=0.01μM	24779514
TF1	Function assay		1 hr	Inhibition of Jak2 in erythropoietin-stimulated human TF1 cells assessed as assessed as phospho-Stat5 after 1 hr incubation, EC50=0.013μM	24779514
neutrophils cells	Function assay			Inhibition of SYK in human neutrophils cells assessed as reduction in FcepsilonR1/FcgammaR-mediated signaling responses, EC50=0.033μM	22257213
SK-M-MC	Function assay		1 hr	Inhibition of Ret in human SK-M-MC cells assessed as assessed as phosphorylation after 1 hr incubation, EC50=0.036μM	24779514
mast cells	Function assay		1 hr	Inhibition of cKit in stem cell factor-stimulated bone marrow derived mouse mast cells assessed as phosphorylation after 1 hr incubation, EC50=0.046μM	24779514
B-cells	Function assay			Inhibition of SYK in human B-cells cells assessed as reduction in FcepsilonR1/FcgammaR-mediated signaling responses, EC50=0.048μM	22257213
Ramos cells	Function assay			Inhibition of Syk in antihuman IgM-stimulated human Ramos cells assessed as decrease in BCR-mediated BLNK phosphorylation by cellular assay, EC50=0.053μM	24779514
mesangial cells	Function assay			Inhibition of SYK in cultured human mesangial cells assessed as reduction in FcepsilonR1/FcgammaR-mediated signaling responses, EC50=0.056μM	22257213
SK-N-SH	Function assay			Inhibition of Ret in human SK-N-SH cells, EC50=0.08μM	22257213
bone marrow cells	Function assay			Inhibition of IL3 dependent proliferation in C57/B16 mouse bone marrow cells using [3H]thymidine by liquid scintillation counting, IC50=0.147μM	24726806
B-cells	Function assay		1 hr	Inhibition of Syk in alphaIgM-stimulated human B cells assessed as cell proliferation after 1 hr incubation by flow cytometry, EC50=0.151μM	24779514
THP1	Function assay			Inhibition of SYK in human THP1 cells assessed as reduction in FcepsilonR1/FcgammaR-mediated signaling responses, EC50=0.171μM	22257213
B-cells	Function assay		1 hr	Inhibition of Syk in alphaIgM-stimulated human B cells assessed as CD86 expression after 1 hr incubation by flow cytometry, EC50=0.335μM	24779514
Ramos	Function assay			Inhibition of Syk in anti IgM-stimulated human Ramos cells assessed as BLNK phosphorylation by cellular assay, IC50=0.457μM	24726806
Rec1	Function assay	2.5 uM	6 hrs	Inhibition of Syk phosphorylation in human Rec1 cells at 2.5 uM incubated for 6 hrs by Western blotting method	25222877
Rec1	Function assay	2.5 uM	6 hrs	Inhibition of Lyn phosphorylation in human Rec1 cells at 2.5 uM incubated for 6 hrs by Western blotting method	25222877
Rec1	Function assay	2.5 uM	6 hrs	Inhibition of BTK phosphorylation in human Rec1 cells at 2.5 uM incubated for 6 hrs by Western blotting method	25222877
SJ-GBM2	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	29435139
A673	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
SK-N-MC	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
NB-EBc1	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	29435139
Saos-2	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells	29435139
OHS-50	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	29435139
Rh41	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 29 mg/mL (61.64 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.500mg/ml (1.06mM)	Taking the 1 mL working solution as an example, add 50 μL of 10 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.500mg/ml (1.06mM)	Taking the 1 mL working solution as an example, add 50 μL of 10 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

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Average weight of animals: g

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% DMSO

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% ddH₂O

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Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	470.45	Formula	C₂₂H₂₃FN₆O₅	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	841290-80-0	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin 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

Mechanism of Action

Targets/IC₅₀/Ki	FLT3 Syk (Cell-free assay) 41 nM
In vitro	R406 (free base) is an ATP-competitive inhibitor of Syk with a Ki value of 30 nM. This compound selectively inhibits Syk-dependent signaling with EC50 values ranging from 33 nM to 171 nM, more potently than Syk-independent pathways in different cells. It 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. This chemical 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 this compound completely blocks the phosphorylation of SYK525/526 and the SYK-dependent phosphorylation of BLNK in R406-sensitive DLBCLs following B-cell receptor (BCR) crosslinking. It 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.
Kinase Assay	In-vitro Fluorescence Polarization Kinase Assays
Kinase Assay	R406 (free base) 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, this compound is tested at eleven concentrations in duplicate and curve-fitting is performed by non-linear regression analysis using Prism GraphPad Software.
In vivo	R406 (free base) has shown efficacy in a number of animal models of immune disorders. Oral administration of this compound 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. This compound 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.
References	[1] https://pubmed.ncbi.nlm.nih.gov/16946104/ [2] https://pubmed.ncbi.nlm.nih.gov/18006696/ [3] https://pubmed.ncbi.nlm.nih.gov/21926965/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT01725230	Completed	Rheumatoid Arthritis	AstraZeneca	November 2012	Phase 1
NCT01598571	Completed	Healthy	AstraZeneca	May 2012	Phase 1
NCT01387308	Completed	Healthy	AstraZeneca	August 2011	Phase 1
NCT01355354	Completed	Healthy Volunteers\|Rheumatoid Arthritis	AstraZeneca	June 2011	Phase 1

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R406 (free base) Syk inhibitor

Chemical Structure

Molecular Weight: 470.45