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Silmitasertib (CX-4945) Casein Kinase 2 Inhibitor

Name: Silmitasertib (CX-4945)
Brand: Selleck Chemicals
SKU: S2248
Availability: InStock
Rating: 5 (144 reviews)

Cat.No.S2248

Silmitasertib (CX-4945) is a potent and selective inhibitor of CK2 (casein kinase 2) with IC50 of 1 nM in a cell-free assay, although it is less potent against Flt3, Pim1 and CDK1 (inactive in cell-based assay). This compound induces autophagy and promotes apoptosis. Phase 1/2.

Chemical Structure

Molecular Weight: 349.77

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Quality Control

Batch: Purity: 99.96%

99.96

Related Targets	Dehydrogenase HSP Transferase P450 (e.g. CYP17) PDE phosphatase PPAR Vitamin Carbohydrate Metabolism Mitochondrial Metabolism
Other Casein Kinase Inhibitors	Silmitasertib (CX-4945) sodium salt D 4476 TBB IC261 PF-670462 (E/Z)-GO289 TTP 22 Longdaysin PF 4800567 5,6-Dichlorobenzimidazole 1-beta-D-ribofuranoside

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Incubation Time	Formulation	Activity Description	PMID
UM-SCC-1	Clonogenic Assay	0.5-5 μM	14 d	DMSO	inhibits clonogenic survival and sphere formation	25379016
U87-MG	Growth Inhibition Assay	1/5/10 μM	24/48/72 h	DMSO	inhibits cell growth both concentration and time dependently	25241897
MDA-MB-231	Function Assay	2/5/10 μM	4 h		inhibits serine 529 phosphorylation and the expression of IL-6, IL-8	25153725
MDA-MB-231	Function Assay	2/5/10 μM	4 h		decreases the constitutive phosphorylation of both p-S529-p65 and p-S129-Akt	25153725
HCT116	Apoptosis Assay	10 μM	24/48 h	DMSO	induces apoptosis	24686080
HCT116	Function Assay	10 μM	4 h	DMSO	causes ER-stress response over the p-eIF2α branch, but does not induce CHOP	24686080
ARPE-19	Function Assay	10 μM	4 h	DMSO	causes ER-stress response over the p-eIF2α branch, but does not induce CHOP	24686080
HCT116	Growth Inhibition Assay	10 μM	24-96 h	DMSO	inhibits cell growth time dependently	24686080
ARPE-19	Growth Inhibition Assay	10 μM	24-96 h	DMSO	inhibits cell growth time dependently	24686080
ARPE-19	Kinase Assay	5/10/20 μM	24/48 h		inhibits CK2 kinase activity at a concentration of 5 μM	24686080
SUP-B15	Apoptosis Assay	6/10 μM	48 h		induces apoptosis	24561792
Nalm6	Apoptosis Assay	6/10 μM	48 h		induces apoptosis	24561792
SUP-B15	Function Assay	10/20 μM	24 h		results in decreased PTEN phosphorylation at the CK2 target residue S380 and concomitant downregulation of PTEN protein expression	24561792
Nalm6	Function Assay	10/20 μM	24 h		results in decreased PTEN phosphorylation at the CK2 target residue S380 and concomitant downregulation of PTEN protein expression	24561792
C2C12	Function Assay	3 μM	12/24/48 h		inhibits the expression of osteoclast differentiation markers and Akt phosphorylation	24293011
MOLT-4	Apoptosis Assay	5 μM	24/48 h		induces apoptosis	24253024
DND-41	Apoptosis Assay	5 μM	24/48 h		induces apoptosis	24253024
ALL-SIL	Apoptosis Assay	5 μM	24/48 h		induces apoptosis	24253024
DND-41	Growth Inhibition Assay	1-10 μM	48 h		IC50=9 μM	24253024
HPB-ALL	Growth Inhibition Assay	1-10 μM	48 h		IC50=6.1 μM	24253024
ALL-SIL	Growth Inhibition Assay	1-10 μM	48 h		IC50=5.7 μM	24253024
PF-382	Growth Inhibition Assay	1-10 μM	48 h		IC50=4.5 μM	24253024
MOLT-4	Growth Inhibition Assay	1-10 μM	48 h		IC50=5.7 μM	24253024
CEM-S	Growth Inhibition Assay	1-10 μM	48 h		IC50=4.6 μM	24253024
CEM-R	Growth Inhibition Assay	1-10 μM	48 h		IC50=4 μM	24253024
Jurkat	Growth Inhibition Assay	1-10 μM	48 h		IC50=4.9 μM	24253024
Rec-1	Growth Inhibition Assay	0-40 μM	48 h		IC50=1.46 µM	24086494
Jeko-1	Growth Inhibition Assay	0-40 μM	48 h		IC50=2.4 µM	24086494
INA-6	Growth Inhibition Assay	0-40 μM	48 h		IC50=2.42 µM	24086494
U-266	Growth Inhibition Assay	0-40 μM	48 h		IC50=19.8 µM	24086494
A549	Function Assay	3 μM	48 h		inhibits TGF-β1-induced activation of Smad and expression of Snail and Twist	24023938
A549	Function Assay	10 μM	12/24/48 h		inhibits TGF-β1-induced migration and invasion	24023938
R-LAMA84	Growth Inhibition Assay	2.5-10 μM	48 h	DMSO	inhibits cell growth concentration dependently	24012109
S-LAMA84	Growth Inhibition Assay	2.5-10 μM	48 h	DMSO	inhibits cell growth concentration dependently	24012109
R-LAMA84	Function Assay	3 μM	24 h	DMSO	reduces CK2 activity	24012109
S-LAMA84	Function Assay	3 μM	24 h	DMSO	reduces CK2 activity	24012109
A549	Function Assay	1/10 μM	48 h	DMSO	leads to a dose-dependent decrease in Notch reporter activity	23651443
H1299	Growth Inhibition Assay	0-30 μM	72 h	DMSO	IC50=1.80 μM, inhibits cell growth concentration dependently	23651443
A549	Growth Inhibition Assay	0-30 μM	72 h	DMSO	IC50=4.15 μM, inhibits cell growth concentration dependently	23651443
LNCap	Growth Inhibition Assay	0-30 μM	4 d		IC50=4.59 μM	22832316
H2170	Function Assay	10 μM	4-24 h		enhances apoptosis with	22387988
A431	Function Assay	10 μM	4-24 h		enhances apoptosis with	22387988
H2170	Function Assay	10 μM	30 min		attenuates PI3K-Akt-mTOR signaling	22387988
A431	Function Assay	10 μM	30 min		attenuates PI3K-Akt-mTOR signaling	22387988
UM-SCC-46	Clonogenic Assay	0.5-5 μM	14 d	DMSO	inhibits clonogenic survival and sphere formation	25379016
H28	Growth Inhibition Assay	0.01-30 μM	72 h	DMSO	IC50=7.2 μM	25422081
H2052	Growth Inhibition Assay	0.01-30 μM	72 h	DMSO	IC50=2.0 μM	25422081
PC9/GR	Function Assay	5 µM	48 h		induces autophagy	25486409
PC9/ER	Function Assay	5 µM	48 h		induces autophagy	25486409
H1299	Growth Inhibition Assay	1/5/10 μM	72 h		inhibits cell growth concentration dependently	25750308
Calu-1	Growth Inhibition Assay	1/5/10 μM	72 h		inhibits cell growth concentration dependently	25750308
H358	Growth Inhibition Assay	1/5/10 μM	72 h		inhibits cell growth concentration dependently	25750308
H1299	Apoptosis Assay	10 μM	72 h		induces apoptosis	25750308
Calu-1	Apoptosis Assay	10 μM	72 h		induces apoptosis	25750308
H358	Apoptosis Assay	10 μM	72 h		induces apoptosis	25750308
NU-DUL	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Oci Ly 3	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Oci Ly 10	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Oci Ly 1	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Oci Ly 18	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Oci Ly 19	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
Raji	Growth Inhibition Assay	5-25 μM	48 h		inhibits cell growth concentration dependently	25788269
UM-SCC1	Growth Inhibition Assay	0.1-30 μM	1-5 d		IC50=4.1 μM	25798061
UM-SCC46	Growth Inhibition Assay	0.1-30 μM	1-5 d		IC50=3.4 μM	25798061
UM-SCC1	Function Assay	0.5/4/10 μM	72 h		down-regulates the expression of NF-ĸB, Bcl-XL and up-regulates the expression of p53, p21, AP-1 and IL-8 concentration dependently	25798061
UM-SCC46	Function Assay	0.5/4/10 μM	72 h		down-regulates the expression of NF-ĸB, Bcl-XL, p53, p21, AP-1 and up-regulates the expression IL-8 concentration dependently	25798061
HEK293	Kinase Assay	0.5 μM	15 min	DMSO	reduces CK2 kinase activity	25887626
Hela	Kinase Assay	0.5 μM	15 min	DMSO	reduces CK2 kinase activity	25887626
LAMA84	Kinase Assay	0.5 μM	15 min	DMSO	reduces CK2 kinase activity	25887626
HEK293	Function Assay	3 μM	5 h	DMSO	CK2 phosphorylates eIF3j at Ser127	25887626
HDMEC	Kinase Assay	1-50 μM	5 h	DMSO	decreases CK2 kinase activity without affecting cell viability	26189586
HDMEC	Function Assay	50 μM	1/5 h	DMSO	decreases the nuclear signal of phosphorylated p65 in TNF-α-stimulated HDMEC	26189586
A549	Function Assay	3/10 μM	48 h		suppresses the micropillar-induced expression of p-FAK	26318800
platelets	Kinase Assay	1/5/10 μM	0.5 h	DMSO	reduces CK2 kinase activity and platelet aggregation	26381437
HDMEC	Kinase Assay	0.25/0.5/1 μM	24 h	DMSO	reduces CK2 kinase activity, vWF expression and secretion	26381437
HDMEC	Function Assay	0.25/0.5/1 μM	24 h	DMSO	reduces expression of VCAM-1 but not ICAM-1	26381437
HDMEC	Function Assay	1 μM	24 h	DMSO	affects subcellular localization of NFATc1 and phospho-p65	26381437
Jurkat	Function assay				Inhibition of CK2 in human Jurkat cells assessed as inhibition of [gamma33P]ATP incorporation into substrate by luminescence assay, IC50 = 0.1 μM.	21174434
MIAPaCa2	Antiproliferative assay		4 days		Antiproliferative activity against human MIAPaCa2 cells after 4 days by alamar blue assay, IC50 = 1.1 μM.	21174434
PC3	Antiproliferative assay		4 days		Antiproliferative activity against human PC3 cells after 4 days by alamar blue assay, IC50 = 2.1 μM.	21174434
HCT116	Antiproliferative assay		4 days		Antiproliferative activity against human HCT116 cells after 4 days by alamar blue assay, IC50 = 2.2 μM.	21174434
H1299	Antiproliferative assay		4 days		Antiproliferative activity against human H1299 cells after 4 days by alamar blue assay, IC50 = 2.4 μM.	21174434
Jurkat	Antiproliferative assay		4 days		Antiproliferative activity against human Jurkat cells after 4 days by alamar blue assay, IC50 = 2.5 μM.	21174434
A549	Antiproliferative assay		4 days		Antiproliferative activity against human A549 cells after 4 days by alamar blue assay, IC50 = 3 μM.	21174434
A375	Antiproliferative assay		4 days		Antiproliferative activity against human A375 cells after 4 days by alamar blue assay, IC50 = 3.9 μM.	21174434
BxPC3	Antiproliferative assay		4 days		Antiproliferative activity against human BxPC3 cells after 4 days by alamar blue assay, IC50 = 4.4 μM.	21174434
LNCAP	Antiproliferative assay		4 days		Antiproliferative activity against human LNCAP cells after 4 days by alamar blue assay, IC50 = 4.7 μM.	21174434
K562	Antiproliferative assay		4 days		Antiproliferative activity against human K562 cells after 4 days by alamar blue assay, IC50 = 5.3 μM.	21174434
MDA-MB-231	Antiproliferative assay		4 days		Antiproliferative activity against human MDA-MB-231 cells after 4 days by alamar blue assay, IC50 = 6.4 μM.	21174434
MCF7	Antiproliferative assay		4 days		Antiproliferative activity against human MCF7 cells after 4 days by alamar blue assay, IC50 = 8.9 μM.	21174434
Hs 578T	Antiproliferative assay		4 days		Antiproliferative activity against human Hs 578T cells after 4 days by alamar blue assay, IC50 = 13.1 μM.	21174434
HCT116	Antiproliferative assay		72 hrs		Antiproliferative activity against human HCT116 cells after 72 hrs by MTS assay, IC50 = 5.2 μM.	22339433
MCF7	Antiproliferative assay		72 hrs		Antiproliferative activity against human MCF7 cells after 72 hrs by MTS assay, IC50 = 6.5 μM.	22339433
A549	Antiproliferative assay		72 hrs		Antiproliferative activity against human A549 cells after 72 hrs by MTS assay, IC50 = 8.2 μM.	22339433
MV4-11	Antiproliferative assay		1 to 3 days		Antiproliferative activity against human MV4-11 cells after 1 to 3 days by MTS assay, CC50 = 3 μM.	23711832
U937	Antiproliferative assay		1 to 3 days		Antiproliferative activity against human U937 cells after 1 to 3 days by MTS assay, CC50 = 4.2 μM.	23711832
Jurkat	Antiproliferative assay		1 to 3 days		Antiproliferative activity against human Jurkat cells after 1 to 3 days by MTS assay, CC50 = 4.5 μM.	23711832
K562	Antiproliferative assay		1 to 3 days		Antiproliferative activity against human K562 cells after 1 to 3 days by MTS assay, CC50 = 7 μM.	23711832
Sf9	Function assay				Inhibition of CDK2/cyclin E (unknown origin) expressed in Sf9 cells using histone H1 as substrate in presence of [gamma33P]ATP, IC50 = 1.8 μM.	24681986
A549	Cytotoxicity assay		72 hrs		Cytotoxicity against human A549 cells after 72 hrs by MTS assay, CC50 = 9.9 μM.	26850376
Sf21	Function assay		90 mins		Inhibition of recombinant human full length N-terminal His6-tagged CK2alpha expressed in Sf21 insect cells using CK2tide as substrate treated for 20 mins measured after 90 mins in presence of MgCl2 by caliper mobility shift assay, IC50 = 0.003 μM.	29559278
Vero E6	Antiviral assay		48 h		IC50 for antiviral activity against SARS-CoV-2 in the Vero E6 cell line at 48 h by immunofluorescence-based assay (detecting the viral NP protein in the nucleus of the Vero E6 cells)., IC50 = 3.89045 μM.	32353859
A549	Function assay	30 uM	48 hrs		Inhibition of CK2-mediated MMP2 activation in human A549 cells at 30 uM after 48 hrs by gelatin-zymography	24012124
A549	Function assay	10 uM	15 to 30 mins		Inhibition of CK2-mediated ERK phosphorylation in human A549 cells at 10 uM after 15 to 30 mins by Western blot method	24012124
A549	Function assay	1 to 10 uM	24 hrs		Inhibition of CK2-mediated MT1-MMP expression in human A549 cells at 1 to 10 uM after 24 hrs by Western blot method	24012124
A549	Function assay	10 uM			Inhibition of CK2-mediated ERK phosphorylation in human A549 cells at 10 uM by Western blot method	24012124
A549	Function assay	10 uM	24 hrs		Inhibition of CK2-mediated AKT phosphorylation in human A549 cells at 10 uM after 24 hrs by Western blot method	24012124
A549	Function assay	10 uM	4 to 24 hrs		Inhibition of CK2-mediated AKT phosphorylation in human A549 cells at 10 uM after 4 to 24 hrs by Western blot method	24012124
U-2 OS	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for U-2 OS cells	29435139
A673	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
DAOY	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells	29435139
Saos-2	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells	29435139
BT-37	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-37 cells	29435139
RD	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for RD cells	29435139
SK-N-SH	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-SH cells	29435139
BT-12	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-12 cells	29435139
MG 63 (6-TG R)	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for MG 63 (6-TG R) cells	29435139
NB1643	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB1643 cells	29435139
OHS-50	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	29435139
Rh41	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
SJ-GBM2	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	29435139
SK-N-MC	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
NB-EBc1	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	29435139
LAN-5	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for LAN-5 cells	29435139
Rh18	qHTS assay				qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh18 cells	29435139
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 70 mg/mL (200.13 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	1.750mg/ml (5.00mM)	Taking the 1 mL working solution as an example, add 50 μL of 35 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

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Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
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Chemical Information, Storage & Stability

Molecular Weight	349.77	Formula	C₁₉H₁₂ClN₃O₂	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	1009820-21-6	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	N/A			Smiles	C1=CC(=CC(=C1)Cl)NC2=NC3=C(C=CC(=C3)C(=O)O)C4=C2C=CN=C4

Mechanism of Action

Features	First clinical inhibitor of CK2.
Targets/IC₅₀/Ki	CK2 (Cell-free assay) 1 nM
In vitro	Silmitasertib (CX-4945) is selective for CK2, as it only inhibits 7 of the 238 kinases by more than 90% at concentration of 0.5 μM, which is 500-fold greater than the IC50 of CK2. Although in cell-free systems this compound inhibits FLT3, PIM1, and CDK1 with IC50 of 35 nM, 46 nM, and 56 nM, respectively, treatment at 10 μM is inactive against FLT3, PIM1, and CDK1 in cell-based functional assays. It exhibits a broad spectrum of antiproliferative activity, and the breast cancer cell lines displays the widest range of sensitivity to it with EC50 of 1.71-20.01 μM. The antiproliferative activity of CX-4945 correlates with CK2α mRNA and protein levels but not the CK2α' catalytic subunit, the regulatory CK2β subunit, and the PI3K/Akt or PTEN mutational status. It inhibits PI3K/Akt signaling by directly blocking the phosphorylation of Akt at Serine 129 by CK2 rather than through activation of PTEN. Treatment with this compound causes reduced phosphorylation of p21 (T145), increased levels of total p21 and p27, and induction of caspase 3/7 activity. It induces a G2/M cell-cycle arrest in BT-474 cells and a G1 arrest in BxPC-3 cells. This compound inhibits HUVEC proliferation, migration, and tube formation with IC50 of 5.5 μM, 2 μM, and 4 μM, respectively. Under hypoxic conditions in BT-474 and BxPC-3 cells, it prevents downregulation of p53 and pVHL and reduces activation of HIF-1α transcription. It potently inhibits endogenous intracellular CK2 activity with IC50 of 0.1 μM in Jurkat cells.
Kinase Assay	CK2 Kinase Assay
Kinase Assay	Silmitasertib (CX-4945) is added at a volume of 10 μL to a reaction mixture comprising 10 μL of assay dilution buffer (ADB; 20 mM MOPS, pH 7.2, 25 mM β-glycerolphosphate, 5 mM EGTA, 1 mM sodium orthovanadate, and 1 mM dithiothreitol), 10 μL of substrate peptide (RRRDDDSDDD, dissolved in ADB at a concentration of 1 mM), 10 μL of recombinant human CK2 (ααββ-holoenzyme, 25 ng dissolved in ADB). Reactions are initiated by the addition of 10 μL of ATP solution (90% 75 mM MgCl₂, 75 μM ATP (final ATP concentration=15 μM) dissolved in ADB; 10% [γ-³³P]ATP (stock 1 mCi/100 μL; 3000 Ci/mM and maintained for 10 minutes at 30 °C. The reactions are quenched with 100 μL of 0.75% phosphoric acid and then transferred to and filtered through a phosphocellulose filter plate. After washing each well five times with 0.75% phosphoric acid, the plate is dried under vacuum for 5 minutes and, following the addition of 15 μL of scintillation fluid to each well, the residual radioactivity is measured using a Wallac luminescence counter. The IC50 values for this compound are derived from eight concentrations over a range of 0.0001 μM to 1 μM.
In vivo	Oral administration of Silmitasertib (CX-4945) at 25 mg/kg or 75 mg/kg twice daily displays potent antitumor activity in the BT-474 model, with TGI of 88% and 97%, respectively, and 2 of 9 animals in each group showing more than 50% reduction in tumor size compared with the initial tumor volume. In the BxPC-3 model, treatment with this compound at 75 mg/kg twice daily shows 93% TGI with 3 animals having no evidence of tumor remaining at the end of the treatment period. In PC3 xenograft model, administration of it at 25 mg/kg, 50 mg/kg, or 75 mg/kg causes tumor growth inhibition with TGI of 19%, 40%, and 86%, respectively.
References	[1] https://pubmed.ncbi.nlm.nih.gov/21159648/ [2] https://pubmed.ncbi.nlm.nih.gov/21174434/ [3] https://pubmed.ncbi.nlm.nih.gov/22267551/ [4] https://pubmed.ncbi.nlm.nih.gov/22387988/

Applications

Methods	Biomarkers	PMID
Western blot	p-S6K1(T389) / S6K1 / p-S6(S235/236) / S6 p-AKT(S129) / p-AKT(T308) / p-AKT(S473) / AKT / p-ERK / ERK / TP53 / p-p21(Th145) / p21 / Bcl-xl p-Smad2 (Cytosol) / Smad2/3 (Cytosol) / Smad2/3 (Nucleus) / Twist / Snail	30683840
Immunofluorescence	β-catenin E-cadherin / Vimentin	24023938
Growth inhibition assay	Cell viability	30316146

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT05817708	Completed	COVID-19	Senhwa Biosciences Inc.	November 7 2022	Phase 1
NCT04668209	Terminated	Coronavirus	University of Arizona\|Senhwa Biosciences Inc.	January 21 2021	Phase 2
NCT04663737	Completed	Covid19	Chris Recknor MD\|Senhwa Biosciences Inc.	December 3 2020	Phase 2
NCT03904862	Suspended	Medulloblastoma Childhood	Pediatric Brain Tumor Consortium\|National Cancer Institute (NCI)\|American Lebanese Syrian Associated Charities (ALSAC)	July 25 2019	Phase 1\|Phase 2
NCT02128282	Completed	Cholangiocarcinoma	Senhwa Biosciences Inc.	June 2014	Phase 1\|Phase 2

Tech Support

Handling Instructions

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Frequently Asked Questions

Question 1:
How to reconstitute it (S2248) for in vivo uses?

Answer:
For injection, it can be dissolved in 2% DMSO+30% PEG 300+2% Tween 80+ddH2O at 5mg/ml clearly. When making the solution, please dissolve this compound in DMSO clearly first. If it dissolves not readily, please sonicate and warm the solution in water bath at about 45-50℃. Then add PEG and Tween. After they mixed well, dilute with water. For oral gavage, it can be dissolved in 1% CMC Na at 30mg/ml as a homogeneous suspension. This is a common formulation for oral gavage, and is convenience to prepare.

C1=C0/X	C1:	LOG(C1):
C2=C1/X	C2:	LOG(C2):
C3=C2/X	C3:	LOG(C3):
C4=C3/X	C4:	LOG(C4):
C5=C4/X	C5:	LOG(C5):
C6=C5/X	C6:	LOG(C6):
C7=C6/X	C7:	LOG(C7):
C8=C7/X	C8:	LOG(C8):