Molecular Weight(MW): 354.41
VS-5584 (SB2343) is a potent and selective dual PI3K/mTOR inhibitor for mTOR, PI3Kα/β/δ/γ with IC50 of 3.4 nM and 2.6-21 nM, respectively. Phase 1.
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VS-5584 inhibits melanoma cell survival and proliferation-Established melanoma cell lines (A375, A-2058 and SK-MEL-3), patient-derived primary melanoma cells, B10BR melanocytes and primary human keratinocytes (“Kera”) were treated with applied concentration of VS-5585 (“VS”) or vehicle control (“C”, 0.1% of DMSO), cell survival was tested by MTT assay (A, E and F) and trypan blue exclusion assay (B, for A375 cells); Cell proliferation was analyzed by through [H3] Thymidine incorporation assay (C, for A375 cells) and clonogenicity assay (D, for A375 cells). Data were expressed as mean ± SD, experiments were repeated three times. *p<0.05 vs group “C”.
PLoS One, 2015, 10(7):e0132655.. VS-5584 (SB2343) purchased from Selleck.
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|Description||VS-5584 (SB2343) is a potent and selective dual PI3K/mTOR inhibitor for mTOR, PI3Kα/β/δ/γ with IC50 of 3.4 nM and 2.6-21 nM, respectively. Phase 1.|
VS-5584 is an ATP-competitive inhibitor which selectively inhibits PI3K/mTOR signaling with equivalent low nanomolar potency against all human Class I PI3K isoforms and mTOR kinase. VS-5584 is approximately 10-fold selective for cancer stem cells with an EC50 of 15 nM in HMLE breast cancer cells. VS-5584 preferentially decreases CD44Hi/CD24Lo cells in an HMLER immortalized mammary cancer cell line. In SUM159 cells, VS-5584 effectively eliminates the cancer stem cell side population.  A large human cancer cell line panel screen (436 lines) reveals broad antiproliferative sensitivity and that cells harboring mutations in PI3KCA are generally more sensitive toward VS-5584 treatment. In the FLT3-ITD harboring MV4-11 cells, VS-5584 blocks pAkt (S473) and pAkt (T308) with IC50 of 12 and 13 nM, respectively. The IC50 of VS-5584 for pS6 (S240/244), pAkt (S473), and pAkt (T308) are 20, 23, and 15 nM, respectively. 
|In vivo||In mice bearing triple negative breast cancer tumors, oral dosing of VS-5584 decreases tumor cancer stem cells and induces tumor regression in taxane-resistant models.  In a PTENnull human prostate PC3 xenograft model, treatment with VS-5584 leads to significant tumor growth inhibition (TGI) of 79% and 113% for 11 and 25 mg/kg, respectively. In a FLT3-ITD AML xenograft model, VS-5584 treatment induces dose-dependent inhibition of tumor growth (28% for 3.7 mg/kg and 76% for 11 mg/kg). |
In vitro mTOR kinase assays :The reaction mixture consisted of the following components in 10 μL assay buffer (50 mM Hepes pH 7.5, 10 mM MgCl 2, 3 mM MnCl 2, 1 mM EGTA, 2 mM DTT, 0.01%Tween-20): 0.10 μg/mL of in-house generated mTOR enzyme, 0.05 μM ULight-eIF4E-binding protein 1 (Thr37/46) peptide and 10 μM ATP. The mixture is incubated for 60 min at room temperature. 10 μL of Detection mixture consisted of 16 mM EDTA, 0.004 mM Eu-W1024-labeled Anti-Phospho-eIF4E-binding protein 1-(Thr37/46) antibody and 1X LANCE® Detection Buffer is then added and incubated for 60 min.
|In vitro||DMSO||71 mg/mL (200.33 mM)|
|Ethanol||3 mg/mL (8.46 mM)|
|In vivo||0.5% methylcellulose+0.2% Tween 80||30 mg/mL|
* 1 mg/ml means slightly soluble or insoluble.
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02372227||Terminated||Relapsed Malignant Mesothelioma||Verastem, Inc.||January 2015||Phase 1|
|NCT01991938||Terminated||Non Hematologic Cancers|Metastatic Cancer|Lymphoma||Verastem, Inc.||November 2013||Phase 1|
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