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Abstract Altered peptide ligands (APL) have the potential to modulate pathogenic T cell reactivity. High concentrations of APL, however, are required to achieve efficient blocking of the T cell response. We have therefore investigated whether improved delivery of APL to professional antigen-presenting cells (APC) can lead to more efficient application of such peptides. For this purpose APL were bis-mannosylated in order to facilitate their uptake by mannose receptor-positive dendritic cells (DC) in vitro. We present evidence that a 100- to 1000-fold lower concentration of bis-mannosylated APL was sufficient for complete blocking of the proliferative T cell response against the agonist peptide compared to the non-mannosylated APL. Moreover, bis-mannosylated APL were similarly effective in the inhibition of the T cell response against whole protein antigens. In contrast, unrelated, bis-mannosylated class II binding peptides were ineffective, indicating that the increased efficiency of the mannosylated APL was not due to competition for binding to class II molecules. Furthermore, a strong increase in the efficiency of presentation of APL was also observed when macrophages and peripheral blood mononuclear cells were used as APC. Thus, bis-mannosylation of APL greatly increases their potency to inhibit proliferative T cell responses. Moreover, it is likely that the use of bis-mannosylated APL will result in preferential presentation by mannose receptor-positive, professional APC. These results may be of relevance for more effective use of APL for immunoregulation in vivo.
International Immunology – Oxford University Press
Published: Sep 1, 1998
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