l 44 0

L 44-0 is a nicotinic acid derivative.

C6 L-erythro Ceramide is a bioactive sphingolipid and cell-permeable analog of naturally occurring ceramides. It is metabolized by ceramide glucosyltransferase to form C6 L-erythro glucosylceramide. C6 L-erythro Ceramide is cytotoxic to U937 cells (IC50 = 18 μM).

C18 L-threo Ceramide is a synthetic ceramide and stereoisomer of C18 ceramide that has been used for structural characterization of natural sphingolipids. It inhibits rat brain mitochondrial ceramidase (mt-CDase) with an IC50 value of 0.21 mol% (16.8 μM).

C6 L-threo Ceramide is a bioactive sphingolipid and cell-permeable analog of naturally occurring ceramides. It is cytotoxic to U937 cells in vitro (IC50 = 18 μM), metabolically inactive, and unlike C6 L-erythro ceramide, it cannot be converted to C6 glucosylceramide by ceramide glucosyltransferase. C6 L-threo Ceramide enhances IL-4 production induced by phorbol 12-myristate 13-acetate in EL4 T cells at 10 μM.

C2 L-threo Ceramide is a bioactive sphingolipid and cell-permeable analog of naturally occurring ceramides. It stimulates cholesterol efflux in CHO cells expressing the human ABCA1 receptor when used at a concentration of 10 μM, however, this efflux is 50% less than that stimulated by C2 ceramide . C2 L-threo Ceramide inhibits IL-4 production by 17% in EL4 T cells stimulated with phorbol 12-myristate 13-acetate when used at a concentration of 10 μM. It also induces cell cycle arrest in the G0/G1 phase and a 7-fold increase in sphingosine accumulation as well as inhibits growth of HL-60 leukemia cells.

2-Desoxypleniradin-4-O-α-L-rhamnopyranoside, a flavonoid, can be isolated from Helenium radiatum [1].

C18 L-erythro Ceramide (d18:1/18:0) significantly reduced extracellular Aβ levels and can be used to study Alzheimer's disease.

C8 L-threo Ceramide is a bioactive sphingolipid and cell-permeable analog of naturally occurring ceramides. It is cytotoxic to U937 cells (IC50 = 10 μM) and, like C8 D-threo ceramide , induces nuclear DNA fragmentation 5- to 6-fold more potently than C8 L-erythro ceramide . C8 D-threo Ceramide also enhances V. cholerae cytolysin pore formation in liposome lipid membranes, as measured by calcein release, with a 50% release dose (RD50) value of ~30 μg/ml.