Abstract
Glycosphingolipids are highly enriched in specialized membrane microdomains (“lipid rafts”, caveolar domains and glycosynapses), and they participate to the process of transduction of information across the membrane. Lactosylceramide (LacCer) is specifically coupled with the Src family kinase Lyn in plasma membrane microdomains of human neutrophils. Ligand binding to LacCer activates Lyn, resulting in neutrophil functions, such as superoxide generation and migration. The β-Gal-(1–4)-β-Glc disaccharide structure of LacCer is necessary, but it is not sufficient for LacCer-mediated Lyn activation. For this function, the presence of a LacCer molecular species with ceramide containing a very long fatty acid chain is also required. In this manuscript, we discuss the importance of interdigitation within the membrane, promoted by the presence of glycosphingolipid species with very long fatty acyl chains as determinants for membrane organization, instrumental to the signaling process.
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Acknowledgements
This paper has been supported in part by University of Milan Grant 2006 to S.S., Fondazione Cariplo Grant 2006 to S.S, Mizutani Foundation for Glycosciences Grant 2007 to A.P. This study was also supported in part by a grant-in-aid for Scientific Research on Priority Areas (16017293) to K.I., and by “High-Tech Research Center” Project for Private Universities: matching fund subsidy from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
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Sonnino, S., Prinetti, A., Nakayama, H. et al. Role of very long fatty acid-containing glycosphingolipids in membrane organization and cell signaling: the model of lactosylceramide in neutrophils. Glycoconj J 26, 615–621 (2009). https://doi.org/10.1007/s10719-008-9215-8
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DOI: https://doi.org/10.1007/s10719-008-9215-8