Induction of T Cell Anergy by Liposomes with Incorporated Major Histocompatibility Complex (MHC) II/Peptide Complexes |
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Authors: | van Rensen Annemiek J. M. L. Taams Leonie S. Grosfeld-Stulemeyer Mayken C. van Eden Willem Crommelin Daan J. A. Wauben Marca H. M. |
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Affiliation: | (1) Department of Pharmaceutics, Faculty of Pharmacy, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, The Netherlands;(2) Institute of Infectious Diseases and Immunology, Department of Immunology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands;(3) Institute of Infectious Diseases and Immunology, Department of Immunology, Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80.165, 3508 TD Utrecht, the Netherlands |
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Abstract: | Purpose. The aim of this study was to use small unilamellar liposomeswith incorporated MHC II/peptide complexes as a carrier system formultivalent antigen presentation to CD4 + T cells.Methods. Purified peptide pre-loaded MHC II molecules wereincorporated into small unilamellar liposomes and tested for their ability toactivate A2b T cells. The outcome of T cell activation by such liposomesin the absence of accessory cells was tested via flow cytometry and aT cell anergy assay.Results. Provided the presence of external co-stimulation,MHC II/peptide liposomes were able to induce proliferation of the A2b T cellclone. More importantly incubation of these T cells withMHC II/peptide liposomes in the absence of co-stimulation did not induceproliferation, however, a MHC/peptide ligand-density dependent downregulation of the TCR was observed. Interestingly, when T cells afterincubation with the MHC II/peptide liposomes were restimulated withtheir specific antigen in the presence of professional APC, these cellswere anergic.Conclusions. We propose MHC II/peptide liposomes as a novel meansto induce T cell anergy. The possibility to prepare tailor-madeliposomal formulations may provide liposomes with an important advantagefor applications in immunotherapy. |
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Keywords: | liposomes antigen-presentation T lymphocytes anergy MHC |
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