Home Angiogenesis Syk inhibitor Fostamatinib (R788) For research use only.

Fostamatinib (R788)

Fostamatinib (R788), a prodrug of the active metabolite R406, is a Syk inhibitor with IC50 of 41 nM, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. Phase 3.

Fostamatinib (R788) Chemical Structure

Fostamatinib (R788) Chemical Structure

CAS No. 901119-35-5

Purity & Quality Control

Fostamatinib (R788) Related Products

Signaling Pathway

Syk Signaling Pathways

Syk Signaling Pathway

Cell Data

Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human Ramos cells Function assay Inhibition of SYK in human Ramos cells, IC50=0.267 μM 23350847
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Biological Activity

Description Fostamatinib (R788), a prodrug of the active metabolite R406, is a Syk inhibitor with IC50 of 41 nM, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. Phase 3.
Features Converted into its active metabolite R406 in vivo.
Targets
Syk [1] Adenosine A3 receptor [1] Adenosine transporter [1] Monoamine transporter [1]
41 nM 81 nM 1.84 μM 2.74 μM
In vitro
In vitro R788 is a prodrug of the spleen tyrosine kinase (Syk) inhibitor R406. R788 is a competitive inhibitor for ATP binding with a Ki of 30 nM. R788 dose-dependently inhibits anti-IgE-mediated CHMC degranulation with an EC50 of 56 nM. R788 also inhibits the anti-IgE-induced production and release of LTC4 and cytokines and chemokines, including TNFα, IL-8, and GM-CSF. Inhibition of Syk by R788 results in inhibition of all phosphorylation events downstream of Syk signaling. Next to FcϵRI signaling in CHMC, R788 most potently inhibits the signaling of IL-4 and IL-2 receptors. R788 specifically inhibits FcγR signaling in human mast cells, macrophages, and neutrophils. R788 can inhibit local inflammatory injury mediated by immune complexes. [1] R788 induces apoptosis of the majority of examined DLBCL cell lines. In R788-sensitive DLBCL cell lines, R788 specifically inhibits both tonic- and ligand-induced BCR signaling (autophosphorylation of SYK525/526 and SYK-dependent phosphorylation of the B-cell linker protein [BLNK]). [2]
Kinase Assay Fluorescence polarization kinase assay and Ki determination
The fluorescence polarization reactions are performed. For Ki determination, duplicate 200-μL reactions are set up at eight different ATP concentrations from 200 μM (2-fold serial dilutions) in the presence of either DMSO or R788 at 125, 62.5, 31.25, 15.5, or 7.8 nM. At different time points, 20 μL of each reaction is removed and quenched to stop the reaction. For each concentration of R788, the rate of reaction at each concentration of ATP is determined and plotted against the ATP concentration to determine the apparent Km and Vmax (maximal rate). Finally the apparent Km (or apparent Ki/Vmax) is plotted against the inhibitor concentration to determine the Ki.
Cell Research Cell lines Cultured human mast cells (CHMC)
Concentrations 0 μM -100 μM
Incubation Time 30 minutes
Method

Cultured human mast cells (CHMC) are derived from cord blood CD34+ progenitor cells and grown, primed, and stimulated and shown in supplemental data. Before stimulation, cells are incubated with R788 or DMSO for 30 minutes. Cells are then stimulated with either 0.25 to 2 mg/mL anti-IgE or anti-IgG or 2 μM ionomycin. For tryptase measurement, ∼1500 cells per well are stimulated for 30 min in modified Tyrode's buffer. For LTC4 and cytokine production, 100,000 cells per well are stimulated for 1 or 7 hours, respectively. Tryptase activity is measured by luminescence readout of a peptide substrate, and LTC4 and cytokines are measured using Luminex multiplex technology.
In Vivo
In vivo Oral administration of R788 to mice reduces immune complex-mediated inflammation in a reverse-passive Arthus reaction and two antibody-induced arthritis models. [1] In another study, R788 effectively inhibits BCR signaling in vivo, resulting in reduced proliferation and survival of the malignant B cells and significantly prolongs survival of the treated animals. [3] R788 demonstrates a significant reduction in major inflammatory mediators such as TNFalpha, IL-1, IL-6 and IL-18, leading to reduced inflammation and bone degradation in models of rheumatoid arthritis. [4]
Animal Research Animal Models Balb/c mice with arthritis
Dosages 1 mg/kg or 5 mg/kg
Administration Orally b.i.d
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT05904093 Not yet recruiting
Sickle Cell Disease|Hb-SS Disease|Hemoglobin S|Disease Sickle Cell Anemia|Sickle Cell Disorders|Hemoglobin Beta Thalassemia Disease
National Heart Lung and Blood Institute (NHLBI)|National Institutes of Health Clinical Center (CC)
 May 15 2024 Phase 1
NCT05509582 Enrolling by invitation
Immune Mediated Anemia|Immune Mediated Thrombocytopenia|Chronic GVHD
National Heart Lung and Blood Institute (NHLBI)|National Institutes of Health Clinical Center (CC)
 May 15 2024 Phase 2
NCT06071520 Completed
Primary Immune Thrombocytopenia
Fundación Pública Andaluza para la gestión de la Investigación en Sevilla
 March 1 2023 --
NCT05613296 Not yet recruiting
ITP - Immune Thrombocytopenia|Chronic ITP|Refractory ITP
Gruppo Italiano Malattie EMatologiche dell''Adulto
 February 2023 --
NCT04543279 Terminated
Myelofibrosis|Thrombocytopenia
Washington University School of Medicine|Rigel Pharmaceuticals
 May 3 2021 Phase 2
NCT04904276 Terminated
ITP|Immune Thrombocytopenia
Rigel Pharmaceuticals
 May 18 2021 --

Chemical Information & Solubility

Molecular Weight 580.46 Formula

C23H26FN6O9P
CAS No. 901119-35-5 SDF Download Fostamatinib (R788) SDF
Smiles CC1(C(=O)N(C2=C(O1)C=CC(=N2)NC3=NC(=NC=C3F)NC4=CC(=C(C(=C4)OC)OC)OC)COP(=O)(O)O)C
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 116 mg/mL ( (199.84 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble


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In vivo
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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.

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Frequently Asked Questions

Question 1:
What’s the difference between S2625 and S2206?

Answer:
S2206 is more stable than S2625. The water solubility of S2206 is better than S2625. The absorption of S2206 is harder than S2625, so you need to test the suitable dosage if you use the product in animal assays. The potency of S2206 and S2625 is similar.

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