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    S-Ruxolitinib (INCB-018424)
    S-Ruxolitinib (INCB-018424)

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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 #: V0337
    CAS #: 941685-37-6 (S-enantiomer) Purity ≥98%

    Description: S-Ruxolitinib, the S-enantiomer of ruxolitinib which is also known as INC424 and INCB18424 or INCB018424,  is the first-in class, potent, selective, and orally bioavailable JAK1/2 (Janus-associated kinase) inhibitor with IC50 of 3.3 nM/2.8 nM in cell-free assays, it exhibits >130-fold selectivity for JAK1/2 versus JAK3. Ruxolitinib has potential antineoplastic and immunomodulating activities. It was approved in 2011 by FDA for the treatment of intermediate or high-risk myelofibrosis, a type of myeloproliferative disorder that affects the bone marrow, and for polycythemia vera (PCV) when there has been an inadequate response to or intolerance of hydroxyurea. It selectively binds to and inhibits protein tyrosine kinases JAK 1 and 2, which may lead to a reduction in inflammation and an inhibition of cellular proliferation.

    References: Blood. 2010 Apr 15;115(15):3109-17; N Engl J Med. 2012 Mar 1;366(9):799-807.

    Related CAS: 941685-37-6; 941678-49-5 (free base); 1092939-16-6 (sulfate); 1092939-17-7 (phosphate)

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    Molecular Weight (MW)306.37
    FormulaC17H18N6
    CAS No.941685-37-6 (S-enantiomer);  
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 61 mg/mL (199.1 mM)
    Water: <1 mg/mL
    Ethanol: <1 mg/mL
    Solubility (In vivo)0.5% CMC+0.25% Tween 80: 30 mg/mL
    Synonyms

    S Ruxolitinib; INCB-018424, INCB 018424, INCB018424; INC424, INC424, INC-424; INCB18424, INCB 18424, INCB-18424; Jakafi and Jakavi (trade name); (S)-INCB018424; S-Ruxolitinib; SRuxolitinib; 

    Chemical Name: (3S)-3-Cyclopentyl-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)pyrazol-1-yl]propanenitrile

    InChi Key: HFNKQEVNSGCOJV-HNNXBMFYSA-N

    InChi Code: InChI=1S/C17H18N6/c18-7-5-15(12-3-1-2-4-12)23-10-13(9-22-23)16-14-6-8-19-17(14)21-11-20-16/h6,8-12,15H,1-5H2,(H,19,20,21)/t15-/m0/s1

    SMILES Code: N#CC[[email protected]@H](C1CCCC1)N2N=CC(C3=C4C(NC=C4)=NC=N3)=C2 


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    In Vitro

    In vitro activity: Ruxolitinib (also known as INC424 and INCB18424) potently and selectively inhibits JAK2V617F-mediated signaling and proliferation in Ba/F3 cells and HEL cells. INCB018424 markedly increases apoptosis in a dose dependent manner in Ba/F3 cells. INCB018424 (64 nM) results in a doubling of cells with depolarized mitochondria in Ba/F3 cells. INCB018424 inhibits proliferating of erythroid progenitors from normal donors and polycythemia vera patients with IC50 of 407 nM and 223 nM, respectively. INCB018424 demonstrates remarkable potency against erythroid colony formation with IC50 of 67nM.  


    Kinase Assay: Recombinant proteins are expressed using Sf21 cells and baculovirus vectors and purified with affinity chromatography. JAK kinase assays use a homogeneous time-resolved fluorescence assay with the peptide substrate (-EQEDEPEGDYFEWLE). Each enzyme reaction is carried out with Ruxolitinib or control, JAK enzyme, 500 nM peptide, adenosine triphosphate (ATP; 1mM), and 2% dimethyl sulfoxide (DMSO) for 1 hour. The 50% inhibitory concentration (IC50) is calculated as Ruxolitinib concentration required for inhibition of 50% of the fluorescent signal.


    Cell Assay: Cells (Ba/F3 and HEL cells) are seeded at 2 × 103/well of white bottom 96-well plates, treated with INCB018424 from DMSO stocks (0.2% final DMSO concentration), and incubated for 48 hours at 37 ℃ with 5% CO2. Viability is measured by cellular ATP determination using the Cell-Titer Glo luciferase reagent or viable cell counting. Values are transformed to percent inhibition relative to vehicle control, and IC50 curves are fitted according to nonlinear regression analysis of the data using PRISM GraphPad.

    In VivoRuxolitinib (180 mg/kg, orally, twice a day) results in survive rate of greater than 90% by day 22 in a JAK2V617F-driven mouse model. Ruxolitinib (180 mg/kg, orally, twice a day) markedly reduces splenomegaly and circulating levels of inflammatory cytokines, and preferentially eliminated neoplastic cells, resulting in significantly prolonged survival without myelosuppressive or immunosuppressive effects in a JAK2V617F-driven mouse model. The primary end point is reached in 41.9% of patients in the Ruxolitinib group as compared with 0.7% in the placebo group in the double-blind trial of myelofibrosis. Ruxolitinib results in maintaining of reduction in spleen volume and improvement of 50% or more in the total symptom score. A total of 28% of the patients in the Ruxolitinib (15 mg twice daily) group has at least a 35% reduction in spleen volume at week 48 in patients with myelofibrosis, as compared with 0% in the group receiving the best available therapy. The mean palpable spleen length has decreased by 56% with Ruxolitinib but has increased by 4% with the best available therapy at week 48. Patients in the ruxolitinib group has an improvement in overall quality-of-life measures and a reduction in symptoms associated with myelofibrosis.
    Animal modelJAK2V617F-driven mouse model
    Formulation & DosageDissolved in 5% dimethyl acetamide, 0.5% methocellulose; 180 mg/kg/day;  Oral gavage
    ReferencesBlood. 2010 Apr 15;115(15):3109-17; N Engl J Med. 2012 Mar 1;366(9):799-807; N Engl J Med. 2012 Mar 1;366(9):787-98. 


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

    S-Ruxolitinib (INCB018424)

    INCB018424 (Ruxolitinib) treatment improves viability and splenomegaly in a JAK2V617F-driven model of malignant disease. Blood. 2010 Apr 15;115(15):3109-17.


    S-Ruxolitinib (INCB018424)

    S-Ruxolitinib (INCB018424)

    Macroscopic and microscopic effects of INCB018424 on spleens from mice inoculated with Ba/F3-EpoR-JAK2V617F cells. Blood. 2010 Apr 15;115(15):3109-17.

    S-Ruxolitinib (INCB018424)

    INCB018424 does not affect normal hematologic parameters. Blood. 2010 Apr 15;115(15):3109-17.


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