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Eur J Immunol. 2005 Jun;35(6):1692-701.

Cell wall glycosphingolipids of Sphingomonas paucimobilis are CD1d-specific ligands for NKT cells.

Author information

1
Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis 46202-5254, USA.

Abstract

The current consensus on characterization of NKT cells is based on their reactivity to the synthetic glycolipid, alpha-galactosylceramide (alpha-GalCer) in a CD1d-dependent manner. Because of the limited availability of alpha-GalCer, there is a constant search for CD1d-presented ligands that activate NKT cells. The alpha-anomericity of the carbohydrate is considered to be an important requisite for the CD1d-specific activation of NKT cells. The gram-negative, lipopolysaccharide-free bacterium Sphingomonas paucimobilis is known to contain glycosphingolipids (GSL) with alpha-anomeric sugars attached to the lipid chain. Here, we report that GSL extracted from this bacterium are able to stimulate NKT cells in a CD1d-specific manner. In addition, soluble CD1d-Ig dimers loaded with this lipid extract specifically bind to NKT cells (but not conventional T cells). Further studies on the S. paucimobilis GSL could potentially lead to other natural sources of CD1d-specific ligands useful for NKT cell analyses and aimed at identifying novel therapies for a variety of disease states.

PMID:
15915536
DOI:
10.1002/eji.200526157
[Indexed for MEDLINE]
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