Name: R406 (free base)
Brand: Selleck Chemicals
SKU: S1533
Rating: 5 (104 reviews)

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.

R406 (free base) Chemical Structure

CAS: 841290-80-0

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

Purity & Quality Control

Batch: Purity: 99.95%

99.95

R406 (free base) Related Products

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Related Compound Libraries	Tyrosine Kinase Inhibitor Library PI3K/Akt Inhibitor Library Angiogenesis Related compound Library HIF-1 Signaling Pathway Compound Library FDA-approved Anticancer Drug Library	Click to Expand

Signaling Pathway

Syk Signaling Pathway

Choose Selective Syk Inhibitors

Cell Data

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

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
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]
Kinase Assay	In-vitro Fluorescence Polarization Kinase Assays
Kinase Assay	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	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.

In Vivo
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]
Animal Research	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)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
Clinical Trial Information (data from https://clinicaltrials.gov, updated on 2024-01-11)
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

References

Chemical Information & Solubility

Molecular Weight	470.45	Formula	C₂₂H₂₃FN₆O₅
CAS No.	841290-80-0	SDF	Download R406 (free base) SDF
Smiles	CC1(C(=O)NC2=C(O1)C=CC(=N2)NC3=NC(=NC=C3F)NC4=CC(=C(C(=C4)OC)OC)OC)C
Storage (From the date of receipt)	3 years-20°Cpowder	Storage of Stock Solutions Aliquot the stock solutions to avoid repeated freeze-thaw cycles	1 year-80°Cin solvent
Storage (From the date of receipt)	3 years-20°Cpowder		1 month-20°Cin solvent

In vitro
Batch:

DMSO : 29 mg/mL ( (61.64 mM)； Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble

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In vivo
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