Abstract
We are exploring cell-based vaccines as a treatment for the 50% of patients with large primary uveal melanomas who develop lethal metastatic disease. MHC II uveal melanoma vaccines are MHC class I+ uveal melanoma cells transduced with CD80 genes and MHC II genes syngeneic to the recipient. Previous studies demonstrated that the vaccines activate tumor-specific CD4+ T cells from patients with metastatic uveal melanoma. We have hypothesized that vaccine potency is due to the absence of the MHC II-associated invariant chain (Ii). In the absence of Ii, newly synthesized MHC II molecules traffic intracellularly via a non-traditional pathway where they encounter and bind novel tumor peptides. Using confocal microscopy, we now confirm this hypothesis and demonstrate that MHC II molecules are present in both the endosomal and secretory pathways in vaccine cells. We also demonstrate that uveal melanoma MHC II vaccines activate uveal melanoma-specific, cytolytic CD8+ T cells that do not lyse normal fibroblasts or other tumor cells. Surprisingly, the CD8+ T cells are cytolytic for HLA-A syngeneic and MHC I-mismatched uveal melanomas. Collectively, these studies demonstrate that MHC II uveal melanoma vaccines are potent activators of tumor-specific CD4+ and CD8+ T cells and suggest that the non-conventional intracellular trafficking pattern of MHC II may contribute to their enhanced immunogenicity. Since MHC I compatibility is unnecessary for the activation of cytolytic CD8+ T cells, the vaccines could be used in uveal melanoma patients without regard to MHC I genotype.
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Acknowledgments
We thank Dr. J. Neefjes for his kind gift of the DR1β-eGFP pcDNA3 plasmid, Dr. J. Leach for use of her fluorescent microscope, Ms. C. Petty for assistance with the confocal microscopy, Ms. V. Clements for her excellent technical assistance, and Dr. P. Chen for his helpful discussions. These studies were supported by NIH R01CA52527, R01CA84232 (SOR), and NIH R01EY016486 (BRK). JJB was partially supported by post-doctoral fellowships from Fight for Sight, Inc., Rotterdamse Vereniging Blindenbelangen, Stichting Blindenhulp, Stichting Blinden-Penning, Stichting Dondersfonds, Stichting Nelly Reef Fund, Gratama Stichting, Stichting Admiraal van Kinsbergen Fonds, and Foundation ‘De Drie Lichten’. UKI was supported by a MARC-U-STAR training grant (NIH/NIGMS GM08663).
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Bosch, J.J., Iheagwara, U.K., Reid, S. et al. Uveal melanoma cell-based vaccines express MHC II molecules that traffic via the endocytic and secretory pathways and activate CD8+ cytotoxic, tumor-specific T cells. Cancer Immunol Immunother 59, 103–112 (2010). https://doi.org/10.1007/s00262-009-0729-0
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DOI: https://doi.org/10.1007/s00262-009-0729-0