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    Entinostat (MS275; SNDX275)
    Entinostat (MS275; SNDX275)

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    This product is for research use only, not for human use. We do not sell to patients.
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    InvivoChem Cat #: V0256
    CAS #: 209783-80-2Purity ≥98%

    Description: Entinostat (formerly known as MS-275; SNDX-275) is a potent, benzamide-based and class-selective but generally pan-HDAC (histone deacetylase) inhibitor with potential anticancer activity. It strongly inhibits HDAC1, HDAC2 and HDAC3 with IC50 of 0.24, 0.45, 0.25 μM in cell-free assays respectively, it is more selective for HDAC1/2/3 over HDACs 4, 6, 8, and 10. Entinostat has potential anticancer activity by binding to and inhibiting histone deacetylase, an enzyme that regulates chromatin structure and gene transcription. This agent appears to exert dose-dependent effects in human leukemia cells including cyclin-dependent kinase inhibitor 1A (p21/CIP1/WAF1)-dependent growth arrest and differentiation at low drug concentrations. 

    References: Proc Natl Acad Sci U S A. 1999 Apr 13;96(8):4592-7; Neuroscience. 2010 Aug 11;169(1):370-7; Clin Cancer Res. 2007 Aug 1;13(15 Pt 1):4538-46.


    Publications Citing Use of InvivoChem Entinostat (MS275; SNDX275)J Med Chem. 2021 Jun 24;64(12):8447-8473. doi: 10.1021/acs.jmedchem.1c00413.

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    Molecular Weight (MW)376.41
    FormulaC21H20N4O3
    CAS No.209783-80-2
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 75 mg/mL (199.3 mM)
    Water: <1 mg/mL
    Ethanol:  <1 mg/mL
    Solubility (In vivo)2% DMSO+30% PEG 300: 10 mg/mL
    SynonymsMS-275; MS 2275; MS-2275; SNDX275; MS2275; SNDX275; MS275; MS 275; SNDX-275; SNDX 275; Entinostat 


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    In Vitro

    In vitro activity: MS-275 shows inhibitory to HDACs by 2'-amino group. MS-275 induces accumulation of p21WAF1/CIP1 and gelsolin in K562 cell. MS-275 could reduce S-phase cells and induce G1-phase cells in A2780 cell. MS-275 inhibits the proliferation of human tumor cell lines including A2780, Calu-3, HL-60, K562, St-4, HT-29, KB-3-1, Capan-1, 4-1St and HCT-15 with IC50 from 41.5 nM to 4.71 μM, which due to HAD-inhibition. MS-275 is not sensitive to other HDACs (4, 6, 8 and 10) with IC50 about/above 100 μM. MS-275 shows great inhibition to human leukemia and lymphoma cells, including U937, HL-60, K562, and Jurkat. MS-275 also decreases expression of cyclin D1 and the antiapoptotic proteins Mcl-1 and XIAP.


    Kinase Assay: Rat liver enzyme is diluted 1:6 with HDAC buffer. Recombinant human HDACs are diluted 1:4 in HDAC buffer. For standard HDAC assays, 60 μL of HDAC buffer is mixed with 10 μL of diluted enzyme solution at 30 °C. The HDAC reaction is started by adding 30 μL substrate solution in HDAC buffer followed by 30 min of incubation at 30 °C. The reaction is stopped by adding 100 μL trypsin solutions (10 mg/ml trypsin in 50 mM Tris-HCl [pH 8.0], 100 mM NaCl, 2 μM TSA). After a 20 min incubation period at 30 °C, the release of AMC is monitored by measuring the fluorescence at 460 nm (λex = 390 nm). Fluorescence intensity is calibrated using free AMC. For standard time course experiments, 20 pmol of substrate is used in the initial 100 μL HDAC reaction. Km and Vmax values are determined by measuring the fluorescence AMC generated by enzymatic cleavage of 2–50 pmol of substrate. The experimental data are analyzed using a Hanes plot. The AMC signals are recorded against a blank with buffer and substrate but without the enzyme.


    Cell Assay: Cancer cells (A2780, Calu-3, HL-60, K562, St-4, HT-29, KB-3-1, Capan-1, 4-1St and HCT-15 cells, 5 × 103 ) are seeded into each well of 96-well plates and cultured with graded concentrations of MS-275 for 3 days. The cells are stained with 0.1 mg/mL neutral red for 1 hour in a CO2-incubator, and, after aspiration of the medium, OD540 of the neutral red solubilized with 50 μL of ethanol and 150 μL of 0.1 M Na2HPO4 is measured. The IC50 value is determined by plotting growth inhibition of the cells against the logarithm of the drug concentration.

    In VivoMS-275 exhibits great antitumor activity against human tumor xenografts except HCT-15 at 49 mg/kg. MS-275 demonstrates promising therapeutic potential in both solid and hematologic malignancies, as well as regulation of physiologic and aberrant gene expression. MS-275, combination with IL-2, has great antitumor activity to renal cell carcinoma xenograft model, which due to decreased T regulatory cells and increased splenocytes.
    Animal modelA2780, HT-29, HTC-15, KB-3-1, 4-1St, St-4, Capan-1 and Calu-3 cells are injected subcutaneously into the flank of nude mice.
    Formulation & DosageDissolved with 0.05 N HCl, 0.1% Tween 80; 12.3, 24.5 and 49 mg/kg;  Oral administration
    References

    Proc Natl Acad Sci U S A. 1999 Apr 13;96(8):4592-7; Neuroscience. 2010 Aug 11;169(1):370-7; Clin Cancer Res. 2007 Aug 1;13(15 Pt 1):4538-46.


    These protocols are for reference only. InvivoChem does not independently validate these methods.

    Entinostat (MS-275)

    Entinostat (MS-275)

     Entinostat (MS-275)
    In vivo effects of MS-27-275 against human tumor xenografts. Proc Natl Acad Sci U S A. 1999 Apr 13;96(8):4592-7.
     
    Entinostat (MS-275)
    Effect of MS-27-275 on HDA activity. Proc Natl Acad Sci U S A.1999 Apr 13;96(8):4592-7.


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