Fig. 1 · Structure

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Fostamatinib disodium (R935788, R788)

Cat. No. A10771 CAS 1025687-58-4

Syk Inhibitor

R935788 (Fostamatinib disodium) is a potent orally available inhibitor of Syk that inhibits tumor growth in the Eμ- TCL1 transgenic mouse model of CLL by blocking antigen-dependent B-cell receptor signaling.

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Biological Activity

Target & Activity

Target Activity Value
Syk (Cell-free assay) 41 nM

In Vitro Studies

Fostamatinib was evaluated in Ba/F3-SYK-TEL cells using untreated cells as controls. The reported proliferation readout was 237.7+/−23.8 nM. [1]

Literature-reported observations and conditions; not Adooq-tested protocols or general treatment recommendations.

Proliferation readout in Ba/F3-SYK-TEL cells

Cell-based study · Ba/F3-SYK-TEL cells [1]

Ba/F3-SYK-TEL cells were treated with Fostamatinib, with untreated cells as controls. The reported proliferation readout was 237.7+/−23.8 nM.

Measured endpoints — not treatment concentrations
EndpointReported resultReference
proliferationIC50 237.7+/−23.8 nM[1]

Literature-Reported Treatment Conditions

Exposure duration
Three-day treatment
Vehicle
DMSO
Reported limits
Not stated in the sentences used: dose, route.
Methods and source locations

Compound reported in the paper: Fostamatinib; Compound label in the paper: R788

The paper names Fostamatinib without stating the salt or form; not verified as the disodium form supplied as A10771. No dose conversion or lot validation.

MATERIALS AND METHODS > Chemical compounds and biologic reagents (S71, S72); MATERIALS AND METHODS > Cell growth studies (S106, S107); Figure 1 legend (S126, S129); Table 1A (T1.h1, T1.r1)

proliferation: proliferation; comparator: control (untreated) cells — MATERIALS AND METHODS > Cell growth studies (S106); Figure 1 legend (S126); Table 1A (T1.h1, T1.r1)

In Vivo Studies

In male NSG mice bearing subcutaneous MHCCLM3 xenografts, Fostamatinib disodium treatment yielded average tumor weights of 1.8 g versus 3.2 g with vehicle after 28 days; the difference was not statistically significant (p = 0.1031). In Apoe−/− mice, dietary Fostamatinib disodium at 0.3 % prevented the rise in circulating Ly6Chigh monocytes associated with hypercholesterolemia and atherogenesis after 8 weeks of HCD. Peripheral monocyte numbers remained unaffected with or without fostamatinib for 4 days. [2,3]

Tumor weights in a subcutaneous xenograft model

Animal study · Male NSG (NOD scid gamma) mice; subcutaneous xenograft model of MHCCLM3 cells [2]

Male NSG (NOD scid gamma) mice bearing subcutaneous MHCCLM3 xenografts received Fostamatinib disodium at 80 mg/kg daily by oral gavage. After 28 days of treatment, average tumor weights were 3.2 g with vehicle and 1.8 g with fostamatinib; the difference was not statistically significant (p = 0.1031).

Measured endpoints — not treatment concentrations
EndpointReported resultReference
tumor weights at the end of the treatmenttumor weight 80 mg/kg administrated daily through oral gavage; 28 days of treatment: 1.8 g in fostamatinib-treated mice[2]

Conditions shared by the study groups

Route
oral gavage
Treatment course
daily; 28 days of treatment
Vehicle
30% PEG 400, 5% PPG and 0.5% Tween 80
Study groups and reported outcomes
Group / doseComparatorObserved resultReference
Fostamatinib disodium 80 mg/kgvehicle (30% PEG 400, 5% PPG and 0.5% Tween 80)Tumors harvested at the end of 28 days of treatment weighed an average of 3.2 g in vehicle-treated mice and 1.8 g in fostamatinib-treated mice; this difference was not statistically significant (p = 0.1031)[2]
Fostamatinib disodium 80 mg/kg
Model: Male NSG (NOD scid gamma) mice; subcutaneous xenograft model of MHCCLM3 cells
Methods and source locations

Compound reported in the paper: Fostamatinib disodium; Compound label in the paper: Fostamatinib

Literature evidence for the named compound in the stated model; no Adooq product-use or lot-performance claim.

2. Results > 2.2. Drug Repurposing Predictions to Reverse Sorafenib Resistance in HCC > 2.2.4. Characterization of Fostamatinib as Anti-HCC Drug (S70, S73, S74); 4. Materials and Methods > 4.5. Mouse Strains, Animal Husbandry and Treatment (S110, S114, S115, S117); Figure 5 legend (S195)

tumor weights at the end of the treatment: tumor weights at the end of the treatment; comparator: vehicle (30% PEG 400, 5% PPG and 0.5% Tween 80) — 2. Results > 2.2. Drug Repurposing Predictions to Reverse Sorafenib Resistance in HCC > 2.2.4. Characterization of Fostamatinib as Anti-HCC Drug (S73, S74); 4. Materials and Methods > 4.5. Mouse Strains, Animal Husbandry and Treatment (S115); Figure 5 legend (S195)

Fostamatinib disodium 80 mg/kg · 2. Results > 2.2. Drug Repurposing Predictions to Reverse Sorafenib Resistance in HCC > 2.2.4. Characterization of Fostamatinib as Anti-HCC Drug (S73, S74); 4. Materials and Methods > 4.5. Mouse Strains, Animal Husbandry and Treatment (S115, S117)

Circulating monocytes in Apoe−/− mice

Animal study · Apoe−/− mice (n = 14 per group) [3]

After 8 weeks of HCD, fostamatinib prevented the rise in circulating Ly6Chigh monocytes associated with hypercholesterolemia and atherogenesis.

Measured endpoints — not treatment concentrations
EndpointReported resultReference
Identification and quantification of blood monocyte subsets by flow cytometryReported result After 8 weeks of HCD, fostamatinib prevented the rise in circulating Ly6Chigh monocytes associated with hypercholesterolemia and atherogenesis; with or without fostamatinib 0.3 % for 4 days, peripheral monocyte numbers were still unaffected.[3]

Conditions shared by the study groups

Route
incorporated at 0.3 % (w/w) into the diet
Treatment course
after 8 weeks of HCD
Vehicle
without carrier
Study groups and reported outcomes
Group / doseComparatorObserved resultReference
Fostamatinib disodium 0.3 %control (gray)After 8 weeks of HCD, fostamatinib prevented the rise in circulating Ly6Chigh monocytes associated with hypercholesterolemia and atherogenesis; with or without fostamatinib 0.3 % for 4 days, peripheral monocyte numbers were still unaffected.[3]
Fostamatinib disodium 0.3 %
Model: Apoe−/− mice (n = 14 per group)
Methods and source locations

Compound reported in the paper: Fostamatinib disodium; Compound label in the paper: Fostamatinib

Literature evidence for the named compound in the stated model; no Adooq product-use or lot-performance claim.

Methods > Animal models (S1, S2); Results > SYK inhibition attenuates atherosclerotic plaque development in Apoe−/− mice (S30); Results > SYK inhibition reduces medullary and extramedullary myelopoiesis in atherosclerotic Apoe−/− mice (S37, S43, S45, S51)

Identification and quantification of blood monocyte subsets by flow cytometry: Identification and quantification of blood monocyte subsets by flow cytometry; comparator: control (gray) — Results > SYK inhibition reduces medullary and extramedullary myelopoiesis in atherosclerotic Apoe−/− mice (S37, S43, S51)

Fostamatinib disodium 0.3 % · Methods > Animal models (S2); Results > SYK inhibition reduces medullary and extramedullary myelopoiesis in atherosclerotic Apoe−/− mice (S37, S43, S51)

Specifications

Manufacturer Adooq Bioscience
Actions Inhibitor
CAS Number 1025687-58-4
Applications Syk Inhibitor
Formula C23H24FN6O9P.2Na
Molecular Weight 624.4
Synonyms R-935788; R788
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+]

Storage & Solubility

In Vitro Solubility

Reported Solubility

SolventReported Solubility
DMSO Warmed: 5 mg/mL (8 mM)
Water Insoluble
Ethanol Insoluble

Preparing Stock Solutions

Stock preparation is unavailable for this product molecular weight.

Calculated stock concentrations do not establish solvent solubility. Refer to the reported solubility data for experimental guidance.

In Vivo Preparation

Concentration
28 mg/mL
Vehicle
0.5% CMC+0.25% Tween 80,pH6.5

Storage

Store powder at -20°C, keep desiccated.
In powder form, the chemical is stable for 36 months.
In solution, store at -20°C and use within 1 month to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.

Research References

  1. [1] Weisberg EL, Puissant A, Stone R, et al. Characterization of midostaurin as a dual inhibitor of FLT3 and SYK and potentiation of FLT3 inhibition against FLT3-ITD-driven leukemia harboring activated SYK kinase. Oncotarget (2017). PMID: 28881711 DOI: 10.18632/oncotarget.19036 Source material
  2. [2] Regan-Fendt K, Li D, Reyes R, et al. Transcriptomics-Based Drug Repurposing Approach Identifies Novel Drugs against Sorafenib-Resistant Hepatocellular Carcinoma. Cancers (Basel) (2020). PMID: 32977582 DOI: 10.3390/cancers12102730 Source material
  3. [3] Lindau A, Härdtner C, Hergeth SP, et al. Atheroprotection through SYK inhibition fails in established disease when local macrophage proliferation dominates lesion progression. Basic Res Cardiol (2016). PMID: 26891724 DOI: 10.1007/s00395-016-0535-8 Source material

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