LX-2931(LX-3305) is a sphingosine-1-phosphate cleavage enzyme (S1P) inhibitor for the treatment of rheumatoid arthritis.

SLP9101555 is a potent and selective sphingosine kinase 2 (SphK2) inhibitor with a Ki of 90 nM.SLP9101555 has a high affinity for SphK2, which is 200-fold higher than that of SphK1.SLP9101555 dramatically reduces extracellular S1P sphingosine 1-phosphate (S1P) levels.

Fingolimod hydrochloride (FTY720) , a novel immune modulator, is a sphingosine 1-phosphate (S1P) antagonist (IC50: 0.033 nM in K562 and NK cells).

SKI-178 is a sphingosine kinase 1 (SphK1) inhibitor with IC50 of 0.1-1.8 μM. It induces prolonged mitosis followed by apoptotic cell death through the intrinsic apoptotic cascade. The sustained activation of CDK1 during prolonged mitosis, mediated by SKI-178 leads to the simultaneous phosphorylation of the prosurvival Bcl-2 family members, Bcl-2 and Bcl-xl, as well as the phosphorylation and subsequent degradation of Mcl-1.

Ceranib-2 (3-[(E)-3-(4-hydroxyphenyl)prop-2-enoyl]-4-phenyl-1H-quinolin-2-one) is an inhibitor of ceramidase with an IC50 of 28 μM in SKOV3 cells. Ceranib-2 decreases levels of sphingosine and S1P, induces cell apoptosis and exhibits anticancer activity.

K145 hydrochloride is a selective sphk2 inhibitor with substrate competitiveness and oral activity, with IC50 of 4.3 µM and Ki of 6.4 µM. K145 hydrochloride can induce apoptosis and has strong antitumor activity.