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. 1992 Aug;76(4):593–598.

Palmitic acid conjugation of a protein antigen enhances major histocompatibility complex class II-restricted presentation to T cells.

J H Robinson 1, M C Case 1, C G Brooks 1
PMCID: PMC1421561  PMID: 1398749

Abstract

The effect on antigenicity of covalent attachment of lipid groups to a protein antigen was investigated. Coupling of palmitic acid to ovalbumin (OVA) enhanced major histocompatibility complex (MHC) class II-restricted presentation to most OVA-specific murine T-cell clones in vitro. The enhanced antigenicity of palmitoylated antigen was localized to the level of presentation of the synthetic peptide epitope, OVA 323-339. T-cell responses to palmitoylated antigen were more difficult to block with anti-MHC class II antibodies than responses to native antigen. However, T-cell proliferation to palmitoyl (p)-OVA and native (n)-OVA were blocked equally by anti-CD4 antibodies. Taken together, the results suggest that lipid conjugation of a protein antigen leads to the formation of a lipopeptide T-cell epitope with increased affinity of binding to MHC class II and/or T-cell receptor (TcR). These results have implications for the design of synthetic peptide vaccines.

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Selected References

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