For research use only.
Catalog No.S7176 Synonyms: SphK-I2
Molecular Weight(MW): 302.78
SKI II 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.
Selleck's SKI II has been cited by 9 publications
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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.
Cancer Cell Int, 2018, 18:202. SKI II purchased from Selleck.
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).
Breast Cancer Res Treat, 2018, 172(1):33-43. SKI II purchased from Selleck.
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).
Neurochemistry International, 2016, 94: 90-97.. SKI II purchased from Selleck.
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.
Neurochem Int, 2016, 94:90-7. SKI II purchased from Selleck.
Protein expression of sphingosine kinase 1 (SphK1), FAK, p-FAK, Slug, vimentin, N-cadherin, E-cadherin in Caco2, HT29, RKO, HCT116 cells. '−' indicates culture without SKI-II or PF-562271, while '+' indicates treatment with SKI-II 20 µM for 48h or PF-562271 5 µM for 48 h.
Int J Mol Med, 2017, 39(5):1277-1284. SKI II purchased from Selleck.
Purity & Quality Control
Choose Selective S1P Receptor Inhibitors
|Description||SKI II 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.|
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.  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.  In addition, SKI-II can reverse drug resistance of SGC7901/DDP to cisplatin by down-regulating expression of P-gp and up-regulating apoptosis through down-regulation of SphK1. 
|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. SKI-II (50 mg/kg ip) ameliorates antigen-induced bronchial smooth muscle hyperresponsiveness in mice by endogenously inhibiting generation of S1P. |
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%.
|In vitro||DMSO||61 mg/mL (201.46 mM)|
|Ethanol||61 mg/mL (201.46 mM)|
|In vivo||Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
30% PEG400+0.5% Tween80+5% propylene glycol
For best results, use promptly after mixing.
* 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.
In vivo Formulation Calculator (Clear solution)
|Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)|
|Dosage||mg/kg||Average weight of animals||g||Dosing volume per animal||ul||Number of animals|
|Step 2: Enter the in vivo formulation (Different batches have different solubility ratios, please contact Selleck to provide you with the correct ratio)|
|% DMSO % % Tween 80 % ddH2O|
Working concentration： mg/ml；
Method for preparing DMSO master liquid: ： mg drug pre-dissolved in μL DMSO (Master liquid concentration mg/mL，)
Method for preparing in vivo formulation：Take DMSO master liquid, next addμL PEG300， mix and clarify, next addμL Tween 80，mix and clarify, next add μL ddH2O，mix and clarify.
1.Please make sure the liquid is clear before adding the next solvent.
2.Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such as vortex, ultrasound or hot water bath can be used to aid dissolving.
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Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2 ( Input Output )
* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
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