1. Cell Cycle/DNA Damage
    Stem Cell/Wnt
  2. Casein Kinase

Silmitasertib (Synonyms: CX-4945)

Cat. No.: HY-50855 Purity: 99.92%
Handling Instructions

Silmitasertib (CX-4945) is a potent, selective and oral casein kinase 2 (CK2) inhibitor with a Ki of 0.38 nM.

For research use only. We do not sell to patients.

Silmitasertib Chemical Structure

Silmitasertib Chemical Structure

CAS No. : 1009820-21-6

Size Price Stock Quantity
Free Sample (0.5-1 mg)   Apply now  
10 mM * 1 mL in DMSO USD 106 In-stock
Estimated Time of Arrival: December 31
5 mg USD 96 In-stock
Estimated Time of Arrival: December 31
10 mg USD 156 In-stock
Estimated Time of Arrival: December 31
50 mg USD 420 In-stock
Estimated Time of Arrival: December 31
100 mg USD 660 In-stock
Estimated Time of Arrival: December 31
200 mg   Get quote  
500 mg   Get quote  

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Customer Review

Other Forms of Silmitasertib:

    Silmitasertib purchased from MCE. Usage Cited in: Oncol Rep. 2017 Feb;37(2):1141-1147.

    CX-4945 increases the expression of apoptosis markers. Western blot analysis reveals that CX-4945 treatment increases the expression of cleaved PARP or cleaved caspase-3. CX-4945 treatment decreases the expression of Bcl-2 or Bcl-xL. The experiment is performed in triplicate, producing similar results.

    Silmitasertib purchased from MCE. Usage Cited in: Oncotarget. 2016 Aug 16;7(33):53191-53203.

    MPNST cell lines show a decrease in CK2 activity in response to escalating CX-4945 concentrations (24 h) as measured by a western blot analysis using anti-CK2 substrate, and to undergo apoptosis as indicated by increased cleaved PARP.

    View All Casein Kinase Isoform Specific Products:

    • Biological Activity

    • Protocol

    • Technical Information

    • Purity & Documentation

    • References


    Silmitasertib (CX-4945) is a potent, selective and oral casein kinase 2 (CK2) inhibitor with a Ki of 0.38 nM.

    IC50 & Target


    1 nM (IC50)


    1 nM (IC50)

    In Vitro

    Silmitasertib (CX-4945) causes cell-cycle arrest and selectively induces apoptosis in cancer cells relative to normal cells, attenuates PI3K/Akt signalingand, and the antiproliferative activity of Silmitasertib (CX-4945) is correlated with expression levels of the CK2α catalytic subunit, Attenuation of PI3K/Akt signaling[1]. Silmitasertib (CX-4945) with bortezomib treatment prevents leukemic cells from engaging a functional UPR in order to buffer the bortezomib-mediated proteotoxic stress in ER lumen, and decreases pro-survival ER chaperon BIP/Grp78 expression[2]. Silmitasertib (CX-4945) induces cytotoxicity and apoptosis, and exerts anti-proliferative effects in hematological tumors by downregulating CK2 expression and suppressing activation of CK2-mediated PI3K/Akt/mTOR signaling pathways[3].

    In Vivo

    Silmitasertib (CX-4945) (25 or 75 mg/kg, p.o.) is well tolerated and demonstrated robust antitumor activity with concomitant reductions of the mechanism-based biomarker phospho-p21 (T145) in murine xenograft models[1].

    Clinical Trial
    Solvent & Solubility
    In Vitro: 

    DMSO : ≥ 35 mg/mL (100.07 mM)

    *"≥" means soluble, but saturation unknown.

    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 2.8590 mL 14.2951 mL 28.5902 mL
    5 mM 0.5718 mL 2.8590 mL 5.7180 mL
    10 mM 0.2859 mL 1.4295 mL 2.8590 mL
    *Please refer to the solubility information to select the appropriate solvent.
    Cell Assay

    Various cell lines are seeded at a density of 3,000 cells per well 24 hours prior to treatment, in appropriate media, and then treated with indicated concentrations of Silmitasertib (CX-4945). Suspensions cells are seeded and treated on the same day. Following 4 days of incubation, Alamar Blue (20 μL, 10% of volume per well) is added and the cells are further incubated at 37°C for 4-5 hours. Fluorescence with excitation wavelength at 530-560 nm and emission wavelength at 590 nm is measured.

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Administration

    Xenografts are initiated by subcutaneous injection of BxPC-3 cells into the right hind flank region of each mouse or BT-474 cells are injected into the mammary fat pad of mice implanted with estrogen pellets. When tumors reach a designated volume of 150-200 mm3, animals are randomized and divided into groups of 9 to 10 mice per group. Silmitasertib (CX-4945) is administered by oral gavage twice daily at 25 or 75 mg/kg for 31 and 35 consecutive days for the BT-474 and BxPC-3 models, respectively. Tumor volumes and body weights are measured twice weekly. The length and width of the tumor are measured with calipers and the volume calculated using the following formula: tumor volume=(length × width2)/2.

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Molecular Weight




    CAS No.




    Powder -20°C 3 years
      4°C 2 years
    In solvent -80°C 6 months
      -20°C 1 month

    Room temperature in continental US; may vary elsewhere

    Purity: 99.92%

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    Cat. No.: HY-50855