SKI II

Catalog No.S7176 Batch:S717602

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Technical Data

Formula

C15H11ClN2OS
Molecular Weight 302.78 CAS No. 312636-16-1
Solubility (25°C)* In vitro DMSO 61 mg/mL (201.46 mM)
Ethanol 8 mg/mL (26.42 mM)
Water Insoluble
In vivo (Add solvents to the product individually and in order)
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 40%PEG300 5%Tween80 50%ddH2O

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 3.050mg/ml (10.07mM) Taking the 1 mL working solution as an example, add 50 μL of 61 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. 
Clear solution
5% DMSO 95% Corn oil

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 0.250mg/ml (0.83mM) Taking the 1 mL working solution as an example, add 50 μL of 5 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results. 
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description SKI II (SphK-I2) is a highly selective and non ATP-competitive sphingosine kinase (SphK) inhibitor with IC50 of 0.5 μM, while exhibiting no inhibitory action on other kinases including PI3K, PKCα and ERK2.
Targets
Sphingosine Kinase [1]
0.5 μM
In vitro

SKI II potently inhibits endogenous SK activities in the breast cancer cell line MDA-MB-231. SKI II demonstrates significantly antiproliferative effects in human cancer cell lines including T-24, MCF-7, MCF-7/VP, NCI/ADR with IC50 of 4.6 μM , 1.2 μM, 0.9 μM and 1.3 μM, respectively. SKI II also induces apoptosis of T24 cells consistent with the hypothesized consequence of reducing S1P levels. [1] As demonstrated previously in MDA-MB-231 cells, SKI II decreases S1P formation in JC cells in a concentration-dependent manner, with IC50 of 12 μM. [2]
In vivo

SKI II (50 mg/kg) after intraperitoneal or oral administration significantly decreases tumor growth a syngeneic Balb/c mouse solid tumor model that uses JC mammary adenocarcinoma cells relative to control groups with no overt toxicity or weight loss.[2] SKI-II (50 mg/kg ip) ameliorates antigen-induced bronchial smooth muscle hyperresponsiveness in mice by endogenously inhibiting generation of S1P. [4]

Protocol (from reference)

Kinase Assay:

[1]
  • SK Assay

    A medium-throughput assay suitable for screening for inhibitors of recombinant human SK has been established. Briefly, 5 μg of purified GST-SK fusion protein are combined with 12 nM sphingosine, which contains a 100-fold dilution of [3-3H]sphingosine (20 Ci/mmol), 1 mM ATP, 1 mM magnesium chloride, and 200 μL of assay buffer [20 mM Tris HCl (pH 7.4), 20% glycerol, 1 mM beta-mercaptoethanol, 1 mM EDTA, 20 mM zinc chloride, 1 mM sodium orthovanadate, 15 mM sodium fluoride, and 0.5 mM 4-deoxypyridoxine]. Assays are run for 30 min at 25°C with shaking and contains either 1% DMSO or 5 g/mL test compound, which corresponds to concentrations of 10–25 μM. The reactions are terminated with 50 μL of concentrated ammonium hydroxide, followed by extraction of the assay mixture with chloroform:methanol (2:1). The aqueous portion is transferred to scintillation vials and radioactivity is quantified as a measure of [3H]]S1P formation using a Beckman LS 3801 Scintillation Counter. The intra-assay coefficient of variation is ~10%, whereas interassay variation is ~20%.
Cell Assay:

[1]
  • Cell lines

    T-24, MCF-7, MCF-7/VP, NCI/ADR cell lines

  • Concentrations

    ~50 μM

  • Incubation Time

    48 hours

  • Method

    T24, MCF-7, MCF-7/VP, and NCI/ADR cells are plated into 96-well tissue culture plates at ~15% confluency. After 24 hours, cells are treated with various concentrations of inhibitors. After an additional 48 hours, cell survival is assayed using the sulforhodamine B assay.
Animal Study:

[2]
  • Animal Models

    JC xenografts are established in mice

  • Dosages

    ~100 mg/kg

  • Administration

    Intraperitoneal administration or oral administration

References

  • https://pubmed.ncbi.nlm.nih.gov/14522923/
  • https://pubmed.ncbi.nlm.nih.gov/16632640/
  • https://pubmed.ncbi.nlm.nih.gov/22524836/
  • https://pubmed.ncbi.nlm.nih.gov/20948165/

Customer Product Validation

Transwell migration and invasion assays were performed. The stained cells were counted in five random fields at ×200 magnification, and the average number was taken. The average number of Control group (cells transduced with pLVX and treated with DMSO) was set as 100%, and relative migration and invasion of other groups was calculated by comparison of the cell number with the average number of control group. ***P < 0.001 versus pLVX + DMSO; ###P < 0.001 versus pLVX-p53 + DMSO.

Data from [ , , Cancer Cell Int, 2018, 18:202 ]

Inhibition of sphingosine kinase 1 in cell-free extract and in vitro. a 1 µM of compounds SK-A to SK-F and SKI-II (commercial inhibitor of SK used as a positive control) were incubated in the presence of recombinant SK1 extract (in excess), 1 µM of ATP, and 1 µM exogenous sphingosine for 1 h. b MDA-MB-231 cells were incubated with 1 µM of compounds SK-A to SK-F and SKI-II for 6 h. SK1 activity was measured as described in materials and methods. Columns, means of three independent experiments normalised to vehicle; bars, SEM. (ns, non-significant; *p < 0.05; **p < 0.01).

Data from [ , , Breast Cancer Res Treat, 2018, 172(1):33-43 ]

D, representative merged IF images with DAPI nuclei staining (blue) in untreated (“Ctl”) and CoCl2-treated cells without (“Veh”), and with SKI-II co-treatment. Scale bar = 30 μm. N=5 independent samples per group. oligodendrocytes(defined by MBP immunoreactivity, red), oligodendrocyte progenitor cell(defined by NG2 immunoreactivity, green).

Data from [ , , Neurochemistry International, 2016, 94: 90-97. ]

C are representative Klüver-Barrera staining for N = 3 per group, scale bars = 120 μm. Panels on the right showing magnification of the areas defined by the black squares on the left panels, scale bars = 30 μm. D, representative immunoblot and E, bar graph of white matter tissue myelin basic protein (MBP) immunoreactivity (as mean ± S.E.M. fold-change relative to mean value of sham operated, N = 6 per group). One-way ANOVA, F(2, 15) = 9.7, *p < 0.05 with post-hoc Bonferroni correction.

Data from [ , , Neurochem Int, 2016, 94:90-7 ]

Selleck's SKI II has been cited by 18 publications

The central role of Sphingosine kinase 1 in the development of neuroendocrine prostate cancer (NEPC): A new targeted therapy of NEPC [ Clin Transl Med, 2022, 12(2):e695] PubMed: 35184376
The sphingosine kinase inhibitor SKI-V suppresses cervical cancer cell growth [ Int J Biol Sci, 2022, 18(7):2994-3005] PubMed: 35541904
The sphingosine kinase inhibitor SKI-V suppresses cervical cancer cell growth [ Int J Biol Sci, 2022, 18(7):2994-3005] PubMed: 35541904
The anti-osteosarcoma cell activity by the sphingosine kinase 1 inhibitor SKI-V [ Cell Death Discov, 2022, 8(1):48] PubMed: 35115496
The anti-osteosarcoma cell activity by the sphingosine kinase 1 inhibitor SKI-V [ Cell Death Discov, 2022, 8(1):48] PubMed: 35115496
Proteomic-Based Approach Reveals the Involvement of Apolipoprotein A-I in Related Phenotypes of Autism Spectrum Disorder in the BTBR Mouse Model [ Int J Mol Sci, 2022, 23(23)15290] PubMed: 36499620
MAPK activity dynamics regulate non-cell autonomous effects of oncogene expression [ Elife, 2020, 9e60541] PubMed: 32940599
Follicle-stimulating hormone promotes the proliferation of epithelial ovarian cancer cells by activating sphingosine kinase [ Sci Rep, 2020, 10(1):13834] PubMed: 32796926
The Intra-nuclear SphK2-S1P Axis Facilitates M1-to-M2 Shift of Microglia via Suppressing HDAC1-Mediated KLF4 Deacetylation. [ Front Immunol, 2019, 10:1241] PubMed: 31214192
Acid ceramidase promotes drug resistance in acute myeloid leukemia through NF-κB-dependent P-glycoprotein upregulation. [ J Lipid Res, 2019, 60(6):1078-1086] PubMed: 30962310

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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