1. Cell Cycle/DNA Damage Cytoskeleton Apoptosis
  2. Kinesin Apoptosis
  3. Ispinesib

Ispinesib  (Synonyms: SB-715992)

Cat. No.: HY-50759 Purity: 99.62%
COA Handling Instructions

Ispinesib is a specific inhibitor of kinesin spindle protein (KSP), with a Ki app of 1.7 nM.

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

Ispinesib Chemical Structure

Ispinesib Chemical Structure

CAS No. : 336113-53-2

Size Price Stock Quantity
Solid + Solvent
10 mM * 1 mL in DMSO
ready for reconstitution
USD 107 In-stock
Solution
10 mM * 1 mL in DMSO USD 107 In-stock
Solid
5 mg USD 94 In-stock
10 mg USD 160 In-stock
50 mg USD 479 In-stock
100 mg USD 792 In-stock
200 mg   Get quote  
500 mg   Get quote  

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Customer Review

Based on 5 publication(s) in Google Scholar

Top Publications Citing Use of Products
  • Biological Activity

  • Protocol

  • Purity & Documentation

  • References

  • Customer Review

Description

Ispinesib is a specific inhibitor of kinesin spindle protein (KSP), with a Ki app of 1.7 nM.

IC50 & Target[1]

KSP

1.7 nM (Ki app)

In Vitro

Ispinesib is a potent, highly specific inhibitor of KSP, with a Ki app of 1.7 nM[1].
Ispinesib (150 nM) inhibits BT-474 and MDA-MB-468 cell lines, with GI50s of 45 and 19 nM, respectively[2].
Ispinesib (SB715992, 15 and 30 nM) suppresses the proliferation of PC-3 prostate cancer cell by 48.65% and 52.16%, and induces apoptosis of prostate cancer cell by 1094.88% and 1516.70%, respectively. Ispinesib up regulates genes responsible for apoptosis and cell cycle arrest, and down regulates genes responsible for cell proliferation and survival. The anti-proliferation and pro-apoptotic activities of Ispinesib can be enhanced by genistein[3].

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

In Vivo

Ispinesib (SCID, 8 mg/kg; nude, 10 mg/kg, q4d × 3) reduces tumor volume in mice bearing tumor xenografts of ER-positive (MCF7), HER2-positive (KPL4, HCC1954, and BT-474), and triple-negative (MDA-MB-468) breast cancer cells via i.p. one dose every 4 days repeated three times[2].

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

Clinical Trial
Molecular Weight

517.06

Formula

C30H33ClN4O2

CAS No.
Appearance

Solid

Color

White to light yellow

SMILES

O=C1N(CC2=CC=CC=C2)C([C@@H](C(C)C)N(CCCN)C(C3=CC=C(C)C=C3)=O)=NC4=CC(Cl)=CC=C14

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 : ≥ 125 mg/mL (241.75 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 1.9340 mL 9.6701 mL 19.3401 mL
5 mM 0.3868 mL 1.9340 mL 3.8680 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: ≥ 2.5 mg/mL (4.84 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 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% Corn Oil

    Solubility: ≥ 2.5 mg/mL (4.84 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown). If the continuous dosing period exceeds half a month, please choose this protocol carefully.

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL Corn oil, and mix evenly.

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: 99.62%

References
Kinase Assay
[1]

Kinesin specificity analysis is carried out using a pyruvate kinase−lactate dehydrogenase detection system that couples the production of ADP to oxidation of NADH. Absorbance changes are monitored at 340 nm. Steady-state studies using nanomolar concentrations of KSP are performed using a sensitive fluorescence-based assay utilizing a pyruvate kinase, pyruvate oxidase, and horseradish peroxidase coupled detection system that couples the generation of ADP to oxidation of Amplex Red to fluorescent resorufin. Generation of resorufin is monitored by fluorescence (λexcitation = 520 nm and λemission= 580 nm). Steady-state biochemical experiments are performed in PEM25 buffer [25 mM Pipes-K+ (pH 6.8), 2 mM MgCl2, 1 mM EGTA] supplemented with 10 µM paclitaxel for experiments involving microtubules. The IC50 for steady-state inhibition is determined at 500 µM ATP, 5 µM MTs, and 1 nM KSP in PEM25 buffer. Ki app (apparent inhibitor dissociation constant) estimates of Ispinesib are extracted from the concentration-response curves, with explicit correction for enzyme concentration[1].

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

Cell Assay
[3]

PC-3 prostate cancer cells are seeded in 96 well plates at a density of 4 × 103 cells/well. PC-3 cells are incubated for 24 hours to allow attachment to the surface of each well of the tissue culture plate. Then, the cells are treated with varying concentration of reagents and incubated for 1 to 3 days. First, PC-3 cells are treated with 15 and 30 nM of Ispinesib, respectively. Second, PC-3 cells are subjected to combinational treatments with 7.5 or 10 nM of Ispinesib plus 30 μM of genistein. Finally, PC-3 cells are pre-treated with 30 μM of genistein for 24 hours followed by treatment with 15 nM of Ispinesib. Control cells are treated with 0.3 mM Na2CO3 (vehicle control). After treatment, PC3 cells are incubated at 37°C with MTT (0.5 mg/mL) for 2 hours and isopropyl alcohol at room temperature for 1 hour. The spectrophotometric absorbance of each sample is then determined by using ULTRA Multifunctional Micro Plate Reader at 595 nm[3].

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

Animal Administration
[2]

Mice with a tumor volume of ∼250 mm3 receive a single dose of Ispinesib (10 mg/kg). Tumors are dissected, fixed in 10% buffered formalin, and embedded in paraffin, and 5-μm tissue sections are prepared. Antigen retrieval is done by boiling in 50 mM citrate buffer (pH 5.5), and sections are then incubated in 3% hydrogen peroxide, washed in PBS-0.1% Tween, and blocked in 10% goat serum. Phospho-histone H3 (PH3) antibody is detected using Alexa Fluor 488 secondary antibody. Images are taken with a microscope at ×10 magnification and captured using MetaMorph software to quantify PH3 expression by computing the area ratio of PH3-positive cells per total cells. Ki67/cleaved caspase-3 staining is done. Nonfluorescent images are taken on an Olympus BX41 microscope at ×20 magnification[2].

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 1.9340 mL 9.6701 mL 19.3401 mL 48.3503 mL
5 mM 0.3868 mL 1.9340 mL 3.8680 mL 9.6701 mL
10 mM 0.1934 mL 0.9670 mL 1.9340 mL 4.8350 mL
15 mM 0.1289 mL 0.6447 mL 1.2893 mL 3.2234 mL
20 mM 0.0967 mL 0.4835 mL 0.9670 mL 2.4175 mL
25 mM 0.0774 mL 0.3868 mL 0.7736 mL 1.9340 mL
30 mM 0.0645 mL 0.3223 mL 0.6447 mL 1.6117 mL
40 mM 0.0484 mL 0.2418 mL 0.4835 mL 1.2088 mL
50 mM 0.0387 mL 0.1934 mL 0.3868 mL 0.9670 mL
60 mM 0.0322 mL 0.1612 mL 0.3223 mL 0.8058 mL
80 mM 0.0242 mL 0.1209 mL 0.2418 mL 0.6044 mL
100 mM 0.0193 mL 0.0967 mL 0.1934 mL 0.4835 mL
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Ispinesib 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.

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