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© The Rockefeller University Press, 0021-9525/1998//637 $5.00
The Journal of Cell Biology, Volume 143, Number 3, , 1998 637-644


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Polyunsaturated Fatty Acids Inhibit T Cell Signal Transduction by Modification of Detergent-insoluble Membrane Domains



Thomas M. Stulnig*, Markus Berger*, Thomas Sigmund*, Daniel Raederstorff{ddagger}, Hannes Stockinger§, and Werner Waldhäusl*

* Department of Internal Medicine III, University of Vienna, A-1090 Vienna, Austria; {ddagger} Hoffmann-La Roche Ltd., CH-4002 Basel, Switzerland; and § Institute of Immunology, Vienna International Research Cooperation Center, University of Vienna, A-1235 Vienna, Austria

Polyunsaturated fatty acids (PUFAs) exert immunosuppressive effects, but the molecular alterations leading to T cell inhibition are not yet elucidated. Signal transduction seems to involve detergent-resistant membrane domains (DRMs) acting as functional rafts within the plasma membrane bilayer with Src family protein tyrosine kinases being attached to their cytoplasmic leaflet. Since DRMs include predominantly saturated fatty acyl moieties, we investigated whether PUFAs could affect T cell signaling by remodeling of DRMs. Jurkat T cells cultured in PUFA-supplemented medium showed a markedly diminished calcium response when stimulated via the transmembrane CD3 complex or glycosyl phosphatidylinositol (GPI)- anchored CD59. Immunofluorescence studies indicated that CD59 but not Src family protein tyrosine kinase Lck remained in a punctate pattern after PUFA enrichment. Analysis of DRMs revealed a marked displacement of Src family kinases (Lck, Fyn) from DRMs derived from PUFA-enriched T cells compared with controls, and the presence of Lck in DRMs strictly correlated with calcium signaling. In contrast, GPI-anchored proteins (CD59, CD48) and ganglioside GM1, both residing in the outer membrane leaflet, remained in the DRM fraction. In conclusion, PUFA enrichment selectively modifies the cytoplasmic layer of DRMs and this alteration could underlie the inhibition of T cell signal transduction by PUFAs.

Key Words: fatty acids • membrane lipids • lymphocytes • signal transduction • protein-tyrosine kinases



Abbreviations used in this paper: BHT, butylated hydroxy-toluene; EtOH, ethanol; DRM, detergent-resistant membrane domain; GAM, goat anti–mouse antibody; GPI, glycosyl phosphatidylinositol; PUFA, polyunsaturated fatty acid; TCR, T cell receptor.

Address all correspondence to T.M. Stulnig, Dept. of Internal Medicine III, Division of Endocrinology and Metabolism, University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria. Tel.: 43 1 40400 4319. Fax: 43 1 40400 4845. E-mail: thomas.stulnig{at}akh-wien.ac.at



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