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PF-543 hydrochloride is a potent, selective, reversible and sphingosine-competitive SPHK1 inhibitor with an IC50 of 2 nM and a Ki of 3.6 nM. PF-543 hydrochloride is >100-fold selectivity for SPHK1 over SPHK2. PF-543 was effective as a potent inhibitor of S1P formation in whole blood, indicating that the SphK1 isoform of sphingosine kinase is the major source of S1P in human blood. In the SphK1-overexpression 1483 head and neck carcinoma cells, PF-543 decreases the level of endogenous S1P 10-fold with a proportional increase in the level of sphingosine. PF-543 binds SphK1 reversibly (k off t1/2=8.5 min) and with high affinity and the binding constant (Kd) is 5 nM. PF543 had no effect on the proliferation and survival of 1483, A549, LN229, Jurkat, U937 and MCF-7 cells, despite a dramatic change in the cellular S1P/sphingosine ratio.
In vivo, administration of 10 mg/kg PF-543 for 24 h to mice induces a decrease in SK1 expression in pulmonary vessels.
| Cell Experiment | |
|---|---|
| Cell lines | 1483, A549, LN229, Jurkat, U937, MCF-7 |
| Preparation method | 1483 cells were cultured in DMEM/Ham’s F-12, A549 and LN229 cells were cultured in DMEM, Jurkat and U937 cells were cultured in RPMI 1640, and MCF-7 cells were cultured in Eagle’s MEM (minimal essential medium) with 0.01 mg/ml insulin. All media were supplemented with L-glutamine, Gentamicin and 10% FBS (or 0.5% FBS as indicated). The cells were grown in 96-well plates in 100 μl of medium with PF-543 or DMSO vehicle (0.01%) at 37 ◦C in an humidified incubator in the presence of 5% CO2. The cell growth and viability was measured using the CellTiter-Glo® Assay (Promega) by quantifying luminescence proportional to the amount of ATP present according to the manufacturer’s protocol. |
| Concentrations | ~1 μM |
| Incubation time | 7 days |
| Animal Experiment | |
|---|---|
| Animal models | Female C57BL/6 J mice (7-12 week-old) with hypoxic-induced pulmonary arterial hypertension |
| Formulation | dissolved in vehicle (20% (2-Hydroxypropyl)-β-cyclodextrin in phosphate buffered saline (PBS)) |
| Dosages | 1 mg/kg |
| Administration | Intraperitoneal injection; every second day; for 21 days |
| Molecular Weight | 502.07 |
| Formula | C27H32ClNO4S |
| CAS Number | 1706522-79-3 |
| Solubility (25°C) | DMSO ≥ 60 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Related SPHK Products |
|---|
| SLM6031434 hydrochloride
SLM6031434 hydrochloride is a highly selective sphingosine kinase 2 (SphK2) inhibitor with Kis of 0.4 μM, 0.5 μM, >20 μM, 22 μM for mSphK2, rSphK2, mSphK1 and rSphK1, respectively. SLM6031434 hydrochloride decrease Sphingosine 1-phosphate (S1P) levels in U937 monocytic leukemia cells. SLM6031434 hydrochloride has the potential for renal fibrosis research. |
| N,N-Dimethylsphingosine
N,N-Dimethylsphingosine is a potent inhbitor of SphK (sphingosine kinase) as an endogenous metabolite of sphingosine produced in various tissues and tumor cell lines. |
| SKI-V
SKI V is a noncompetitive and potent inhibitor of non-lipid sphingosine kinase with IC50 of 2 μM for GST-hSK. SKI-V also inhibits PI3K with IC50 of 6 μM for hPI3k. SKI-V decreases formation of the mitogenic second messenger sphingosine-1-phosphate (S1P) and induces apoptosis with antitumor activity. |
| WAY-604116
WAY-604116 is a sphingosine kinase inhibitor |
| WAY-358981
WAY-358981 is a Sphingosine kinase inhibitor |
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