Catalog No.S7176 Synonyms: SphK-I2

For research use only.

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.

SKI II Chemical Structure

CAS No. 312636-16-1

Selleck's SKI II has been cited by 15 publications

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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.
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 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. [3]

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 Research:[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 Research:[2]
  • Animal Models: JC xenografts are established in mice
  • Dosages: ~100 mg/kg
  • Administration: Intraperitoneal administration or oral administration

Solubility (25°C)

In vitro

Chemical Information

Molecular Weight 302.78


CAS No. 312636-16-1
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles C1=CC(=CC=C1C2=CSC(=N2)NC3=CC=C(C=C3)O)Cl

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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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