货号：A451925同义名：
Sphingosine Kinase 1 Inhibitor II hydrochloride;PF-543 (hydrochloride)
PF-543 HCl is a cell-permeant inhibitor of SphK1 with a Ki of 3.6 nM, PF-543 is sphingosine-competitive and is more than 100-fold selective for SphK1 over the SphK2 isoform.
Sphingosine 1-phosphate (S1P) is an extracellular ligand that regulates endothelial cell function and angiogenesis, promotes survival and migration of cancer cells, and acts as a key regulator of immune cell trafficking. S1P is formed primarily by the action of sphingosine kinases (SphKs). PF 543 is a potent, cell-permeant inhibitor of SphK1 with an IC50 value of 2.0 ± 0.6nM in an in vitro enzyme assay and is able to inhibit the enzyme >95% at 20 nM. PF-543 was also able to inhibit C17-S1P formation in 1483 cells with an IC50 value of 1.0 ± 0.3nM. PF-543 showed 132-fold selectivity for SphK1 over SphK2 (IC50 = 356nM). The inhibition of SphK1 by PF-543 led to a concentration-dependent depletion of the intracellular level of S1P with an EC50 value of 8.4nM. The presence of 1μM PF-543 for 7 days in the culture medium resulted in a 10-fold decrease in S1P and a 2-fold increase in sphingosine levels in 1483 cells. PF543 also potently inhibited C17-S1P formation in human whole blood with an IC50 value of 26.7 nM[1]. PF-543 treatment (0.93mg/kg body weight per day) for 28 days significantly decreased erythrocyte Sphk1 activity and reduced erythrocyte and plasma S1P levels in SCD Tg mice[2].
作用机制
PF 543 structurally resembles sphingosine and potentially could act as SphK1 substrate. It inhibits S1P binding to human recombinant SphK1 with a Ki value of 3.6nM[1].
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