2. Cell Cycle/DNA Damage Epigenetics Autophagy
  3. Aurora Kinase Autophagy
  4. Tozasertib

Tozasertib  (Synonyms: VX 680; MK-0457)

Cat. No.: HY-10161 Purity: 99.93%
COA Handling Instructions

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Tozasertib (VX 680; MK-0457) is an inhibitor of Aurora A/B/C kinases with Kis of 0.6, 18, 4.6 nM, respectively.

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

Tozasertib Chemical Structure

Tozasertib Chemical Structure

CAS No. : 639089-54-6

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Solid + Solvent (Highly Recommended)
10 mM * 1 mL in DMSO
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Customer Review

Based on 13 publication(s) in Google Scholar

Tozasertib Related Antibodies

Top Publications Citing Use of Products

View All Aurora Kinase Isoform Specific Products:

View All Isoforms
Aurora Kinase Aurora A Aurora B Aurora C

  • Biological Activity

  • Protocol

  • Purity & Documentation

  • References

  • Customer Review

Description

Tozasertib (VX 680; MK-0457) is an inhibitor of Aurora A/B/C kinases with Kis of 0.6, 18, 4.6 nM, respectively.

IC50 & Target[1]

Aurora A

0.6 nM (Ki)

Aurora B

18 nM (Ki)

Aurora C

4.6 nM (Ki)

In Vitro

Tozasertib induces similar cytotoxicity with IC50 of approximately 300 nM and exhibits an AUR B-like inhibitory phenotype of G2/M arrest, endoreduplication and apoptosis in BaF3 cells transfected with ABL or FLT-3 (mutant and wild type) kinases. Tozasertib prevents the CAL-62 proliferation in a time-dependent manner. Tozasertib treatment for 14 days significantly decreases the number and size of colonies by approximately 70% in the 8305C and 90% in the CAL-62, 8505C and BHT-101. Treatment of the different ATC cells with Tozasertib inhibits proliferation with the IC50 between 25 and 150 nM. The Tozasertib significantly impairs the ability of the different cell lines to form colonies in soft agar. Analysis of caspase-3 activity indicates that Tozasertib induces apoptosis in the different cell lines. CAL-62 cells exposed for 12 hours to Tozasertib show an accumulation of cells with ≥ 4N DNA content. Time-lapse analysis demonstrates that Tozasertib-treated CAL-62 cells exit metaphase without dividing. Moreover, histone H3 phosphorylation is abrogated following Tozasertib treatment[2]. Tozasertib has significant inhibitory activity against BCR-Abl bearing the T315I mutation in patient-derived samples[3].

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

Tozasertib Related Antibodies
Clinical Trial
Molecular Weight

464.59

Formula

C23H28N8OS
CAS No.
Appearance

Solid

Color

White to off-white

SMILES

CC1=CC(NC2=NC(SC3=CC=C(C=C3)NC(C4CC4)=O)=NC(N5CCN(CC5)C)=C2)=NN1
Shipping

Room temperature in continental US; may vary elsewhere.
Storage

4°C, protect from light

*In solvent : -80°C, 1 year; -20°C, 6 months (protect from light)

Solvent & Solubility
In Vitro: 

DMSO : ≥ 106.67 mg/mL (229.60 mM; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

*"≥" means soluble, but saturation unknown.

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 2.1524 mL 10.7622 mL 21.5244 mL
5 mM 0.4305 mL 2.1524 mL 4.3049 mL
View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 1 year; -20°C, 6 months (protect from light). When stored at -80°C, please use it within 1 year. When stored at -20°C, please use it within 6 months.

  • Molarity Calculator

  • Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass
=
Concentration
×
Volume
×
Molecular Weight *

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start)

C1

×
Volume (start)

V1

=
Concentration (final)

C2

×
Volume (final)

V2

In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

  • Protocol 1

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 2.08 mg/mL (4.48 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

    Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
  • Protocol 2

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: ≥ 2.08 mg/mL (4.48 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.

    Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

g

Dosing volume
(per animal)

μL

Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
%
DMSO +
% 
+
%
Tween-80 +
%
Saline
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Calculation results:
Working solution concentration: mg/mL
Method for preparing stock solution: mg drug dissolved in μL  DMSO (Stock solution concentration: mg/mL).

*In solvent : -80°C, 1 year; -20°C, 6 months (protect from light)

The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only. If necessary, please contact MedChemExpress (MCE).
Method for preparing in vivo working solution for animal experiments: Take μL DMSO stock solution, add μL . μL , mix evenly, next add μL Tween 80, mix evenly, then add μL Saline.
 If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
Purity & Documentation

Purity: 99.93%

COA (249 KB) HNMR (288 KB) LCMS (256 KB)

Handling Instructions (2659 KB)
References
Kinase Assay
[3]

The consumption of ATP is coupled via the pyruvate kinase/lactic dehydrogenase enzyme pair to the oxidation of NADH, which can be monitored through the decrease in absorption at 340 nm. Reactions contains 100 mM Tris (pH 8), 10 mM MgCl2, 2.2 mM ATP, 1 mM phosphoenolpyruvate, 0.6 mg/mL NADH, 75 units/mL pyruvate kinase, 105 units/mL lactate dehydrogenase, and 0.5 mM substrate peptide (sequence: EAIYAAPFAKKK). Reactions (75 μL) are started by adding sufficient kinase to bring the reactions to 30 nM kinase concentration and the decrease in absorbance is monitored over 30 minutes at 30°C in a microtiter plate spectrophotometer. Inhibitory constants are obtained through addition of 3.75 μL Tozasertib in 100% DMSO or DMSO alone. Ki values are calculated as follows, Ki=IC50/(1+[S]/Kd), where [S]=[ATP]=2.2 mM, and Kd (of ATP to Abl)=70 μM. These values are calculated assuming a Kd (ATP) of 70 μM for wild type and H396P Abl kinase domain.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.
Cell Assay
[2]

The CAL-62 cells are cultured in the absence (dimethyl sulfoxide, DMSO) or the presence of 500  nM Tozasertib for different periods of time (1-5 days). The dose-dependent effects of Tozasertib on cell proliferation are evaluated by treating the different ATC cells for 4 days with different concentrations of the Aurora inhibitor (5-500 nM). The cells are pulse labeled with 30 mM BrdU for 2  hours before the end of the incubation time. The BrdU incorporation is analyzed by means of a colorimetric immunoassay using the cell proliferation ELISA kit. The results from Tozasertib-treated cells are compared with those observed in control cells and expressed as a fold of variation versus control.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.
Animal Administration
[1]

For the HL-60 study, female athymic NCr-nu mice are inoculated subcutaneously with 107 HL-60(TB) leukemia cells into the right axillary area. Treatment is administered i.p. b.i.d. after tumors reached 150−200 mm3. Tozasertib is prepared in a vehicle of 50% PEG 300 in 50 mM phosphate buffer. Cisplatin, formulated in saline, is administered i.p. q.4.d. for a total of three injections, at a dose of 5.4 mg/kg. For the MIA PaCa-2 studies, female MF1 nude mice are inoculated with 107 MIA PaCa-2 cells into the dorsal flank. Treatment is administered i.p. b.i.d. after tumors reach 175 mm3. Tozasertib is prepared in a vehicle of 50% PEG 300 in 50 mM phosphate buffer. 5-fluorouracil, formulated in saline, is administered i.v. q.4.d. at a dose of 50 mg/kg. For the HCT116 study, female Hsd RH rnu/nu rats are inoculated with 107 HCT116 cells into the right flank. Treatment is administered once the tumors reached 700−950 mm3. Tozasertib is administered continuously through an indwelling femoral catheter, followed by a saline infusion for 4 d before repeating the dose cycle. For all studies, tumor volume is determined by caliper measurements three times a week.

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

Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 1 year; -20°C, 6 months (protect from light). When stored at -80°C, please use it within 1 year. When stored at -20°C, please use it within 6 months.

Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
DMSO 1 mM 2.1524 mL 10.7622 mL 21.5244 mL 53.8109 mL
5 mM 0.4305 mL 2.1524 mL 4.3049 mL 10.7622 mL
10 mM 0.2152 mL 1.0762 mL 2.1524 mL 5.3811 mL
15 mM 0.1435 mL 0.7175 mL 1.4350 mL 3.5874 mL
20 mM 0.1076 mL 0.5381 mL 1.0762 mL 2.6905 mL
25 mM 0.0861 mL 0.4305 mL 0.8610 mL 2.1524 mL
30 mM 0.0717 mL 0.3587 mL 0.7175 mL 1.7937 mL
40 mM 0.0538 mL 0.2691 mL 0.5381 mL 1.3453 mL
50 mM 0.0430 mL 0.2152 mL 0.4305 mL 1.0762 mL
60 mM 0.0359 mL 0.1794 mL 0.3587 mL 0.8968 mL
80 mM 0.0269 mL 0.1345 mL 0.2691 mL 0.6726 mL
100 mM 0.0215 mL 0.1076 mL 0.2152 mL 0.5381 mL
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Tozasertib Related Classifications

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

Keywords:

Tozasertib639089-54-6VX 680 MK-0457VX680VX-680MK0457MK 0457MK-0457Aurora KinaseAutophagyInhibitorinhibitorinhibit

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