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Synthesis and Biological Activity of a Novel Inhibitor of Dihydroceramide Desaturase
Author(s) -
MunozOlaya Jose M.,
Matabosch Xavier,
Bedia Carmen,
EgidoGabás Meritxell,
Casas Josefina,
Llebaria Amadeu,
Delgado Antonio,
Fabriàs Gemma
Publication year - 2008
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.200700325
Subject(s) - in vitro , chemistry , trypan blue , endogeny , methylene blue , substrate (aquarium) , sphingolipid , stereochemistry , jurkat cells , biochemistry , cell culture , ceramide , phosphocholine , enzyme , microbiology and biotechnology , biology , apoptosis , immunology , phospholipid , membrane , phosphatidylcholine , ecology , genetics , immune system , photocatalysis , t cell , catalysis
A novel mechanism‐based dihydroceramide desaturase inhibitor (XM462) in which the substrate C5 methylene group is replaced by a sulfur atom is reported. Dihydroceramide desaturase inhibition occurred both in vitro and in cultured cells with IC 50 values of 8.2 and 0.78 μ M , respectively, at a substrate concentration of 10 μ M . In vitro experiments showed that XM462 produced a mixed‐type inhibition (K i =2 μ M , α=0.83). LC‐MS analyses showed that accumulation of endogenous dihydroceramides occurred in cells upon treatment with XM462 in serum‐free medium, whereas ceramides built up in controls. In addition, XM462 was found to be metabolised to its 1‐glucosyl and 1‐phosphocholine derivatives, and to the products of N‐deacylation and reacylation with palmitoyl and stearoyl groups. In Jurkat A3 cells cultured in serum‐free medium, viability, as the percentage of trypan blue unstained cells in total cells, was reduced upon XM462 treatment (5 μ M , 24 h), but not in controls. The interest of this compound is discussed.