Abstract
Xenogeneic tissues induce vigorous T cell immunity, reflecting the ability of costimulatory molecules to function across species barriers. We describe a strategy to inhibit costimulation that exploits species differences using the model of porcine pancreatic islet transplantation into mice. Mice were immunized with chimeric peptides that contained a known T cell epitope and selected sequences of the porcine costimulatory molecule CD86. This resulted in anti-peptide antibody responses that recognized intact porcine CD86, blocked costimulation by porcine CD86 but not murine CD86 in vitro, and prolonged the survival of porcine islet grafts in vivo. This strategy of inducing endogenous donor-specific costimulatory blockade has potential clinical applicability.
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Acknowledgements
We thank G. Taylor for assistance in the selection and design of the chimeric peptides, A.Chaudry for help with statistical analysis, H. Reiser for the donation of CHO transfectants, and H. Stauss and A. George for reading the manuscript. Supported by ML laboratories, St. Albans, Hertfordshire; additional funding was provided by PPL Laboratories, Scotland.
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Rogers, N., Mirenda, V., Jackson, I. et al. Costimulatory blockade by the induction of an endogenous xenospecific antibody response. Nat Immunol 1, 163–168 (2000). https://doi.org/10.1038/77853
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DOI: https://doi.org/10.1038/77853