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Fostamatinib (R788) disodium
Catalog No.S2206 Synonyms: Tamatinib Fosdium
For research use only.
Fostamatinib disodium (R788, Tamatinib Fosdium), a prodrug of the active metabolite R406, is a Syk inhibitor with IC50 of 41 nM in a cell-free assay, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. Phase 3.
CAS No. 1025687-58-4
Selleck's Fostamatinib (R788) disodium has been cited by 14 publications
Purity & Quality Control
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Biological Activity
| Description | Fostamatinib disodium (R788, Tamatinib Fosdium), a prodrug of the active metabolite R406, is a Syk inhibitor with IC50 of 41 nM in a cell-free assay, strongly inhibits Syk but not Lyn, 5-fold less potent to Flt3. Phase 3. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Features | Clinically used oral formulation of R406. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Targets |
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| In vitro |
R935788 is a methylene phosphate prodrug of R406, which can be rapidly converted to R406 in vivo. R406 (in vitro active form of R935788) 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 variety of diffuse large B-cell lymphoma (DLBCL) cell lines with EC50 values ranging from 0.8 μM to 8.1 μM. [2] R406 treatment reduces basal phosphorylation of BLNK, Akt, glycogen synthase kinase-3 (GSK-3), forkhead box O (FOXO) and ERK not only in cells with high (TCL-002) but also in cells with low levels of phosphorylated Syk (TCL1-551). In addition, R406 completely inhibits the anti-IgM induced Bcr signal in TCL1 leukemias. Despite the higher levels of constitutively active Syk in TCL1 leukemias, R406 is not selectively cytotoxic to the leukemic cells. [3] |
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| Cell Data |
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| Assay |
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| In vivo | Given that plasma half-life of R406 in mice is less than 2 hours, R935788 is administered in 3 divided doses at 3-hour intervals to provide continuous Syk inhibition during each day of treatment, mimicking the longer plasma half-life in humans (15 hours). Despite the relatively modest cytotoxic effect in vitro, R935788 significantly inhibits the proliferation and survival of leukemic cell in vivo, which is associated with the blocking of antigen-dependent B-cell receptor (Bcr) signaling rather than inhibition of constitutive Syk activity. R935788 treatment at 80 mg/kg/day for 18-21 days potently inhibits tumor growth of TCL1-002, TCL1-551 and TCL1-870 in mice with undetectable leukemic CD5+/B220+ cells at the last day of treatment, significantly prolongs the survival of the treated mice with median survival increased from 45/46 days to 170/172 days, and completely eradicates the malignant cells in a substantial proportion of mice after a 6-month follow-up period without affecting the production of normal B lymphocytes. R935788 treatment also induces an early and transient migration of both normal and malignant B cells from spleen and lymph nodes to peripheral blood, which is subsequently followed by selective growth inhibition of the malignant B-cell population. In addition, R935788 is also effective against spontaneously developing TCL1 leukemias in Eμ-TCL1 transgenic mice. [3] |
Protocol (from reference)
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Solubility (25°C)
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In vitro |
DMSO |
6 mg/mL
warmed (9.6 mM) |
| Water |
Insoluble
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| Ethanol |
Insoluble
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In vivo |
Add solvents to the product individually and in order |
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 | 624.42 | ||
|---|---|---|---|
| Formula | C23H24FN6O9P.2Na |
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| CAS No. | 1025687-58-4 | ||
| Storage | 3 years | -20°C | powder |
| 2 years | -80°C | in solvent | |
| 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.[Na+].[Na+] | ||
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Clinical Trial Information
| NCT Number | Recruitment | Interventions | Conditions | Sponsor/Collaborators | Start Date | Phases |
|---|---|---|---|---|---|---|
| NCT04543279 | Recruiting | Drug: Fostamatinib|Drug: Ruxolitinib | Myelofibrosis | Washington University School of Medicine|Rigel Pharmaceuticals | May 3 2021 | Phase 2 |
| NCT04904276 | Recruiting | Drug: Fostamatinib | ITP|Immune Thrombocytopenia | Rigel Pharmaceuticals | May 18 2021 | -- |
| NCT02611063 | Active not recruiting | Drug: fostamatinib | Hematological Malignancies | Stefanie Sarantopoulos MD PhD.|Duke University | January 2016 | Phase 1 |
| NCT01725230 | Completed | Drug: Fostamatinib|Drug: Rosuvastatin|Drug: Simvastatin | Rheumatoid Arthritis | AstraZeneca | November 2012 | Phase 1 |
| NCT01608542 | Completed | Drug: Fostamatinib 100mg|Drug: Fostamatinib 200mg | Healthy Japanese Volunteers | AstraZeneca | June 2012 | Phase 1 |
(data from https://clinicaltrials.gov, updated on 2022-01-17)
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:
The differences between S2625 and S2206: 1. S2206 is more stable than S2625; 2. The water solubility of S2206 is better than S2625; 3. The absorption of S2206 is harder than S2625, so you need to test the suitable dosage if you use the product in animal assays; 4. The potency of S2206 and S2625 is similar.
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