Entospletinib
Based on 12 publication(s) in Google Scholar
Entospletinib (GS-9973) is an orally bioavailable, selective Syk inhibitor with an IC50 of 7.7 nM.
For research use only. We do not sell to patients.
- Purity: 99.49%
- CAS No.: 1229208-44-9
- Formula: C23H21N7O
- Molecular Weight:411.46
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Storage:Powder -20°C, 3 years , 4°C, 2 years ; In solvent -80°C, 2 years , -20°C, 1 year
Publications Citing Use of MedChemExpress (MCE) Entospletinib
More- Nat Commun. 2026 Feb 12;17(1):1214. [Abstract]
- Cell Rep. 2024 Sep 13;43(9):114741. [Abstract]
- Cell Rep. 2024 May 16;43(5):114249. [Abstract]
- Mol Cancer Ther. 2024 Oct 1;23(10):1404-1417. [Abstract]
- Eur J Med Chem. 2020 Oct 15;204:112636. [Abstract]
- J Bone Miner Res. 2020 Feb;35(2):382-395. [Abstract]
- J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
- J Mol Cell Biol. 2026 Jan 2:mjaf059. [Abstract]
- Hematol Oncol. 2025 Mar;43(2):e70058. [Abstract]
- Metabolomics. 2026 Apr 17;22(3):51.
- PLoS One. 2024 Nov 1;19(11):e0308647. [Abstract]
- SSRN. 2023 Dec 1.
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In Vivo Efficacy Study
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In Vivo Imaging
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IHC
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In Vivo Efficacy Study
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In Vivo Imaging
Biological Activity
IC50: 7.7 nM (Syk)
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Cell Line
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Type | Value | Description | References |
|---|---|---|---|---|
| A549 | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human A549 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human A549 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| BaF3 | IC50 |
32 nM
Compound: GS-9973
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Antiproliferative activity against mouse BaF3 cells harboring TEL/SYK incubated for 72 hrs by CellTiter-Glo assay
Antiproliferative activity against mouse BaF3 cells harboring TEL/SYK incubated for 72 hrs by CellTiter-Glo assay
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[PMID: 38604095] |
| BaF3 | IC50 |
5577 nM
Compound: GS-9973
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Antiproliferative activity against IL3 stimulated mouse BaF3 cells harboring TEL/SYK incubated for 72 hrs by CellTiter-Glo assay
Antiproliferative activity against IL3 stimulated mouse BaF3 cells harboring TEL/SYK incubated for 72 hrs by CellTiter-Glo assay
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[PMID: 38604095] |
| Bone marrow cell | IC50 |
582 nM
Compound: 2, GS-9973
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Cytotoxicity against C57BL/6 mouse bone marrow cells assessed as growth inhibition preincubated for 4 days followed by [3H]-thymidine addition measured after 5 hrs by betaplate counting analysis
Cytotoxicity against C57BL/6 mouse bone marrow cells assessed as growth inhibition preincubated for 4 days followed by [3H]-thymidine addition measured after 5 hrs by betaplate counting analysis
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[PMID: 25633741] |
| Caco-2 | IC50 |
6.86 μM
Compound: 173
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Cytotoxicity against human Caco-2 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human Caco-2 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| ES-2 | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human ES2 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human ES2 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| HEY | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human HEY cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human HEY cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| HUVEC | EC50 |
>1000 nM
Compound: 68, GS-9973
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Inhibition of KDR in VEGF-stimulated HUVEC assessed as phosphorylation after 1 hr incubation
Inhibition of KDR in VEGF-stimulated HUVEC assessed as phosphorylation after 1 hr incubation
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[PMID: 24779514] |
| MV4-11 | EC50 |
327 nM
Compound: 68, GS-9973
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Inhibition of Flt3 in human MV411 cells assessed as assessed as proliferation after 72 hrs incubation by spectrophotometry
Inhibition of Flt3 in human MV411 cells assessed as assessed as proliferation after 72 hrs incubation by spectrophotometry
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[PMID: 24779514] |
| NCI-H1299 | IC50 |
6.26 μM
Compound: 173
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Cytotoxicity against human NCI-H1299 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human NCI-H1299 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| NCI-H460 | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human NCI-H460 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human NCI-H460 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| OVCAR-5 | IC50 |
8.3 μM
Compound: 173
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Cytotoxicity against human OVCAR-5 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human OVCAR-5 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| Ramos | EC50 |
26 nM
Compound: 68, GS-9973
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Inhibition of Syk in antihuman IgM-stimulated human Ramos cells assessed as decrease in BCR-mediated BLNK phosphorylation by cellular assay
Inhibition of Syk in antihuman IgM-stimulated human Ramos cells assessed as decrease in BCR-mediated BLNK phosphorylation by cellular assay
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[PMID: 24779514] |
| Ramos | EC50 |
2 nM
Compound: 3; GS-9973
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Inhibition of SYK in human Ramos cells assessed as reduction in antihuman IgM F(ab)2-induced phosphorylation of BLNK at Y96 residue preincubated for 1 hr followed by antihuman IgM F(ab)2 stimulation for 5 mins by MSD high bind plate assay
Inhibition of SYK in human Ramos cells assessed as reduction in antihuman IgM F(ab)2-induced phosphorylation of BLNK at Y96 residue preincubated for 1 hr followed by antihuman IgM F(ab)2 stimulation for 5 mins by MSD high bind plate assay
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[PMID: 32292557] |
| SK-OV-3 | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human SK-OV-3 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human SK-OV-3 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| SW626 | IC50 |
>10 μM
Compound: 173
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Cytotoxicity against human SW626 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
Cytotoxicity against human SW626 cells assessed as reduction in cell growth incubated for 72 hrs by CCK-8 assay
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[PMID: 37300915] |
| TF-1 | EC50 |
453 nM
Compound: 68, GS-9973
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Inhibition of Jak2 in erythropoietin-stimulated human TF1 cells assessed as assessed as phospho-Stat5 after 1 hr incubation
Inhibition of Jak2 in erythropoietin-stimulated human TF1 cells assessed as assessed as phospho-Stat5 after 1 hr incubation
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[PMID: 24779514] |
Entospletinib (GS-9973) shows good bidirectional permeability across Caco-2 cell monolayers in vitro. In cells, Entospletinib (GS-9973) also shows excellent selectivity for Syk, and potently inhibits BCR-mediated activation and proliferation of B-cells as well as immune-complex-stimulated cytokine production in monocytes[1].
The combination of idelalisib and Entospletinib (GS-9973) synergistically inhibits CLL cell viability and further disrupts chemokine signaling[2].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
| NCT Number | Sponsor | Condition | Start Date |
Phase
|
|---|---|---|---|---|
| NCT01329991 | Plexxikon| | 2011-05 | PHASE1 |
Chemical Information
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CAS No. 1229208-44-9
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Appearance Solid
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Molecular Weight 411.46
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Formula C23H21N7O
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Color White to off-white
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SMILES
C12=NC=CN1C=C(C3=CC4=C(C=C3)C=NN4)N=C2NC5=CC=C(N6CCOCC6)C=C5
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Synonyms
GS-9973
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Shipping
Room temperature in continental US; may vary elsewhere.
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Storage
Powder -20°C 3 years 4°C 2 years In solvent -80°C 2 years -20°C 1 year
Publications (12)
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Journal Impact Factor
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Most Recent
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Nat Commun
Human iPSC-based Modeling of Pulmonary Fibrosis Reveals p300/CBP Inhibition Suppresses Alveolar Transitional Cell State. [Abstract]2026 Feb 12;17(1):1214. PMID: 41680175 -
Cell Rep
Integrated metabolic-transcriptomic network identifies immunometabolic modulations in human macrophages. [Abstract]2024 Sep 13;43(9):114741. PMID: 39276347 -
Cell Rep
Podocyte SIRPα reduction aggravates lupus nephritis via promoting T cell inflammatory responses. [Abstract]2024 May 16;43(5):114249. PMID: 38758648 -
Mol Cancer Ther
AKT Inhibition Sensitizes to Polo-Like Kinase 1 Inhibitor Onvansertib in Prostate Cancer. [Abstract]2024 Oct 1;23(10):1404-1417. PMID: 38894678 -
Eur J Med Chem
Scaffold hopping of the SYK inhibitor entospletinib leads to broader targeting of the BCR signalosome. [Abstract]2020 Oct 15;204:112636. PMID: 32731189 -
J Bone Miner Res
2020 Feb;35(2):382-395. PMID: 31613396 -
J Bone Miner Res
Second-Generation SYK Inhibitor Entospletinib Ameliorates Fully Established Inflammation and Bone Destruction in the Cherubism Mouse Model. [Abstract]2018 Aug;33(8):1513-1519. PMID: 29669173
Entospletinib purchased from MedChemExpress. Usage Cited in: J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
Experimental sequence of Entospletinib (GS-9973, 100 mg/kg, daily) administration. 10-week-old Sh3bp2+/+ and Sh3bp2KI/KI mice were treated with 100 mg/kg of GS-9973 or DMSO every day for 6 weeks. Mice were euthanized at 16 weeks of age for analysis.
Entospletinib purchased from MedChemExpress. Usage Cited in: J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
Facial appearance of Entospletinib (GS-9973, 100 mg/kg, daily)- treated or DMSO-treated mice (top: before treatment at 10 weeks of age; bottom: after treatment at 16 weeks of age). Blue arrows indicate closed eyelids due to facial skin inflammation. GS-9973 treatment improved eyelid closure in Sh3bp2KI/KI mice at 16 weeks old (red arrows). Numbers represent the percentage of Sh3bp2KI/KI mice with improved facial swelling.
Entospletinib purchased from MedChemExpress. Usage Cited in: J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
Liver sections from Entospletinib (GS-9973, 100 mg/kg, daily)-treated or DMSO-treated Sh3bp2+/+ and Sh3bp2KI/KI mice (H&E). Arrows indicate inflammatory infiltrates.
Entospletinib purchased from MedChemExpress. Usage Cited in: J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
Serum TNF-α levels of GS-9973-treated or DMSO-treated Sh3bp2+/+ and Sh3bp2KI/KI mice at 16 weeks old.
Entospletinib purchased from MedChemExpress. Usage Cited in: J Bone Miner Res. 2018 Aug;33(8):1513-1519. [Abstract]
3D μCT images of the ankle joint (top) and calcaneus (bottom) from 16-week-old Sh3bp2+/+ and Sh3bp2KI/KI mice treated with Entospletinib (GS-9973) or DMSO.
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J Mol Cell Biol
FcεRIγ Reinforces Double-Negative T cell-mediated Antibody-dependent Cellular Cytotoxicity Against Tumor Cells. [Abstract]2026 Jan 2:mjaf059. PMID: 41481135 -
Hematol Oncol
Gene Expression Profiling in Acute Myeloid Leukemia Patient Subgroups With High and Low Sensitivity Toward SYK Inhibitors. [Abstract]2025 Mar;43(2):e70058. PMID: 40088478 -
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PLoS One
A novel small molecule screening assay using normal human chondrocytes toward osteoarthritis drug discovery. [Abstract]2024 Nov 1;19(11):e0308647. PMID: 39485774 -
Solvent & Solubility
DMSO : 35 mg/mL (85.06 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 2 years; -20°C, 1 year. When stored at -80°C, please use it within 2 years. When stored at -20°C, please use it within 1 year.
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 2 years; -20°C, 1 year. When stored at -80°C, please use it within 2 years. When stored at -20°C, please use it within 1 year.
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
Select the appropriate dissolution method based on your experimental animal and administration route.
- For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
- To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for In Vivo experiments, it is recommended to prepare freshly and use it on the same day.
- The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.
Please enter the basic information of animal experiments:
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Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
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%DMSO +
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
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%+
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+%Tween-80 + +
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%Saline +
The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Working solution concentration: 0.22 mg/mL
Method for preparing stock solution: mg drug dissolved in μL DMSO. Stock solution concentration: mg/mL.
1. Take μL DMSO stock solution;
2. Add μL .
μL , mix evenly;
3. Then add μL Tween 80, mix evenly;
4. Then add μL
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
Protocol
Functional impact on cellular Flt3 activity is determined by measuring compound inhibition of MV-4-11 cell proliferation. A total of 104 cells are diluted in RPMI medium containing 10% FBS in 96-well flat-bottomed tissue culture plates and incubated with compound dilutions for 72 h at 37°C. Alamar blue (10%) is added to the cells, which are incubated for an additional 12-18 h at 37°C, and inhibition of the relative cell numbers is determined by spectrophotometer readings at 570/600 nm.
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Female Lewis rats (mean mass 178 g, eight per group for collagen arthritis, four per group for normal controls) are anesthetized with isoflurane and injected with 300 μL of Freund’s incomplete adjuvant containing 2 mg/mL bovine type II collagen at the base of the tail and two sites on the back on days 0 and 6. Oral dosing (bid at 12 h intervals) is performed on arthritic days 0-7 with vehicle (Cremophor/ethanol/saline), Entospletinib (GS-9973) (1, 3, or 10 mg/kg), or the reference compound dexamethasone (Dex; 0.075 mg/kg) administered daily (qd). Rats are terminated on arthritis day 16. Efficacy evaluation is based on animal body masses, daily ankle caliper measurements, ankle diameters expressed as the area under the curve (AUC), terminal hind paw masses, and histopathologic evaluation of ankles and knees. PK is measured from plasma samples taken 0, 2, 4, 8, 12, and 24 h post last dose. The paws are fixed in formalin and processed for hemotoxylin (H) and eosin (E) microscopy. H and E sections are scored for bone resorption as follows: (0) normal; (0.5) normal on low magnification but have the earliest hint of small areas of resorption in the metaphysis with no resorption in the tarsal bones; (1) (minimal) small definite areas of resorption in distal tibial trabecular or cortical bone or in the tarsal bones, not readily apparent on low magnification, rare osteoclasts; (2) (mild) more numerous areas (<25% loss of bone in growth plate area) of resorption in distal tibial trabecular or cortical bone and tarsals apparent on low magnification, osteoclasts more numerous; (3) (moderate) obvious resorption of medullary trabecular and cortical bone without full thickness defects in both distal tibial cortices, loss of some medullary trabeculae with 26-50% loss across the growth plate and cortices, some loss in tarsal bones, lesion apparent on low magnification, osteoclasts more numerous; (4) (marked) full or nearly full thickness defects in both distal tibial cortices, often with distortion of the profile of the remaining cortical surface, marked loss of medullary bone of distal tibia (50-100% loss across the growth plate area and cortices and up to 50% loss in small tarsals if minor in tibia), numerous osteoclasts, minor to mild resorption in smaller tarsal bones; (5) (severe) full thickness defects in both distal tibial cortices with >75% loss across the growth plate and both cortices and >50% loss in tarsals, often with distortion of the profile of the remaining cortical surface, marked loss of medullary bone of distal tibia, numerous osteoclasts. Osteoclast counts (5400× fields) are performed on the ankles in the areas of greatest bone resorption.
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Purity & Documentation
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Data Sheet (281 KB)
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SDS (393 KB)
- English - EN (393 KB)
- Français - FR (393 KB)
- Deutsch - DE (393 KB)
- Norwegian - NO (393 KB)
- Español - ES (393 KB)
- Swedish - SV (393 KB)
- Italian - IT (393 KB)
- Korean - KR (393 KB)
- Portuguese - PT (393 KB)
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Handling Instructions (2659 KB)
References
[1]. Currie KS, et al. Discovery of GS-9973, a Selective and Orally Efficacious Inhibitor of Spleen Tyrosine Kinase. J Med Chem. 2014 May 8;57(9):3856-73. [Content Brief]
[2]. Burke RT, et al. A potential therapeutic strategy for chronic lymphocytic leukemia by combining Idelalisib and GS-9973, a novel spleen tyrosine kinase (Syk) inhibitor. Oncotarget. 2014 Feb 28;5(4):908-15. [Content Brief]
Complete Stock Solution Preparation Table
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 2 years; -20°C, 1 year. When stored at -80°C, please use it within 2 years. When stored at -20°C, please use it within 1 year.
| Optional Solvent | Concentration Solvent Mass | 1 mg | 5 mg | 10 mg | 25 mg |
|---|---|---|---|---|---|
| DMSO | 1 mM | 2.4304 mL | 12.1518 mL | 24.3037 mL | 60.7592 mL |
| 5 mM | 0.4861 mL | 2.4304 mL | 4.8607 mL | 12.1518 mL | |
| 10 mM | 0.2430 mL | 1.2152 mL | 2.4304 mL | 6.0759 mL | |
| 15 mM | 0.1620 mL | 0.8101 mL | 1.6202 mL | 4.0506 mL | |
| 20 mM | 0.1215 mL | 0.6076 mL | 1.2152 mL | 3.0380 mL | |
| 25 mM | 0.0972 mL | 0.4861 mL | 0.9721 mL | 2.4304 mL | |
| 30 mM | 0.0810 mL | 0.4051 mL | 0.8101 mL | 2.0253 mL | |
| 40 mM | 0.0608 mL | 0.3038 mL | 0.6076 mL | 1.5190 mL | |
| 50 mM | 0.0486 mL | 0.2430 mL | 0.4861 mL | 1.2152 mL | |
| 60 mM | 0.0405 mL | 0.2025 mL | 0.4051 mL | 1.0127 mL | |
| 80 mM | 0.0304 mL | 0.1519 mL | 0.3038 mL | 0.7595 mL |