Synthesis and Evaluation of<i>N</i>-Acetyl-2-amino-2-deoxy-<i>α</i>-D-galactosyl 1-Thio-7-oxaceramide, a New Analogue of<i>α</i>-D-Galactosyl Ceramide
作者:Roshini Rajan、Thresen Mathew、Radovan Buffa、Frédéric Bornancin、Marco Cavallari、Peter Nussbaumer、Gennaro De Libero、Andrea Vasella
DOI:10.1002/hlca.200800454
日期:2009.5
Abstractmagnified imageThe N‐acetyl‐2‐amino‐2‐deoxy‐α‐D‐galactopyranosyl 1‐thio‐7‐oxaceramide 1 was synthesized by substituting the 7‐oxasphingosine triflate 3 with α‐D‐N‐acetyl‐1‐thiogalactosamine (2). The triflate 3 was obtained from azide 4. Thiol 2 was prepared according to a known procedure from α‐D‐galactosamine hydrochloride. As compared to ceramide (Cer), 1 is neither a substrate of ceramide kinase (CerK), consistent with the absence of the C(1)OH group, nor an inhibitor of Cer phosphorylation by CerK. While 1 partially displaced CD1d‐bound lipids, it failed to stimulate invariant natural killer T (iNKT) cells when presented by human CD1d‐transfected cells. These results suggest that 1 binds weakly to recombinant CD1d, but does not form immunogenic complexes with CD1d.