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The long-term goal of this study is to assess the feasibility of using fetal pig pancreas fragment (FPPF) transplantation to treat patients with type I diabetes. Using the highly inbred Westran Pigs, our initial aim was to establish a rejection-free transplant model of FPPF grafted into sibling recipient pigs without immunosuppression. FPPFs were isolated from 80–100-day-old fetuses of either Westran Pigs or outbred pigs and transplanted into the thymus, spleen, liver, or kidney of the recipient Westran pig. Biopsies were taken from each transplant site at set time points and assessed histologically for islet viability, rejection, and endocrine function. Fifty-eight fetal donors were used to transplant 16 recipient pigs. A nonspecific inflammation was seen for both outbred and inbred FPPF donor tissue at day 3 and was considered a response to ischemic necrosis. However, all the transplanted outbred FPPF donor tissue was acutely rejected and lost by day 10–14. In contrast, inbred FPPF tissue showed little evidence of graft necrosis after 3 days, and growth and formation of epithelial islet cell nest-like structures were seen to 28 days after transplantation. With time after transplantation, increasing amounts of insulin immunoperoxidase staining was seen together with chromogranin and somatostatin staining. In summary, this study confirms the potential of the Westran pig to answer the unproven ability of fetal pancreatic tissue to reverse type I diabetes in a large animal model.

A Large-Animal Model to Evaluate the Clinical Potential of Fetal Pig Pancreas Fragment Transplantation