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The sphingosine kinases (SPHK) phosphorylate sphingosine, producing the important lipid mediator sphingosine-1-phosphate (S1P). The two known kinases, SPHK 1 and SPHK 2, have different developmental and tissue expression patterns, suggesting that they have distinct physiological functions.1,2 Notably, SPHK 1 is overexpressed in several forms of cancer and inhibition of SPHK 1 inhibits tumor growth.3 CAY10621 is a selective inhibitor of SPHK 1, both in vitro (IC50 = 3.3 μM) and in U937 cells overexpressing human SPHK 1 (70% inhibition at 5 μM).4 It has no inhibitory effect on SPHK 2 either in vitro or in cells. Similarly, CAY10621 does not reduce the activity of protein kinase C (PKC) except at very high concentration (>75 μM).4
1
Spiegel, S., and Milstien, S. Functions of the multifaceted family of sphingosine kinases and some close relatives. J Biol Chem282(4)2125-2129(2007).
2
Takabe, K., Paugh, S.W., Milstien, S., et al. 'Inside-out' signaling of sphingosine-1-phosphate: Therapeutic targets. Pharmacol Rev60181-195(2008).
3
Shida, D., Takabe, K., Kapitonov, D., et al. Targeting SphK1 as a new strategy against cancer. Curr Drug Targets9(8)662-673(2008).
4
Wong, L., Tan, S.L., Lam, Y., et al. Synthesis and evaluation of sphingosine analogues as inhibitors of sphingosine kinases. J Med Chem523618-3626(2009).
Spiegel, S., and Milstien, S. Functions of the multifaceted family of sphingosine kinases and some close relatives. J Biol Chem282(4)2125-2129(2007).
Shida, D., Takabe, K., Kapitonov, D., et al. Targeting SphK1 as a new strategy against cancer. Curr Drug Targets9(8)662-673(2008).
Wong, L., Tan, S.L., Lam, Y., et al. Synthesis and evaluation of sphingosine analogues as inhibitors of sphingosine kinases. J Med Chem523618-3626(2009).
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