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T-cell responses during pig-to-primate xenotransplantation.

Davila, E; Byrne, GW; LaBreche, PT; McGregor, HCJ; Schwab, AK; Davies, WR; Rao, VP; ... McGregor, CGA; + view all (2006) T-cell responses during pig-to-primate xenotransplantation. Xenotransplantation , 13 (1) pp. 31-40. 10.1111/j.1399-3089.2005.00258.x.

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UNLABELLED: Xenotransplantation using porcine organs may resolve a chronic shortage of donor organs for clinical transplantation if significant immunological barriers can be overcome. To determine the potential role of T lymphocytes in Xenograft (Xg) rejection, we transplanted transgenic hCD46 porcine hearts heterotopically into baboon recipients. METHODS: Recipients were treated to deplete anti-Gal antibody with a non-antigenic alpha-Gal polyethylene glycol polymer (TPC) (n = 2), TPC plus rituximab (anti-CD20) (n = 1) or were untreated (n = 1). None of the recipients received T-cell immunosuppression. RESULTS: All Xgs failed within 7 days and showed evidence of a mixed humoral and cellular rejection process. Cellular infiltration consisting primarily of CD4+ T cells and few CD8+ T cells. Proliferation and cytotoxicity assays showed sensitization of CD4+ and CD8+ T cells that reacted with porcine IFN-gamma (pIFN-gamma)-stimulated porcine aortic endothelial cells (PAEC). The CD4+ lymphocytes displayed greater cytotoxicity than CD8+ cells. An increased frequency of PAEC-specific interleukin (IL) 2 and IFN-gamma-secreting T cells was observed, suggesting a Th1 cytokine bias. An increase in the percentage of circulating CD4+CD28- cells was observed at the time of rejection and over 50% of the CD4+ cells recovered from residual pig tissue at necropsy lacked CD28 expression. CONCLUSIONS: These findings show that lymphocytes are efficiently stimulated by PAEC antigens and can mediate direct tissue destruction. These studies (1) provide an insight into the potential of cellular-mediated cardiac Xg rejection, (2) show for the first time the induction of cytotoxic pig-specific CD4+CD28- lymphocytes and (3) provide a rational basis for determining different modes of immunosuppression to treat Xg rejection.

Type: Article
Title: T-cell responses during pig-to-primate xenotransplantation.
Location: Denmark
DOI: 10.1111/j.1399-3089.2005.00258.x
Keywords: Animals, Animals, Genetically Modified, Antibodies, Monoclonal, Antibodies, Monoclonal, Murine-Derived, Antigens, Cells, Cultured, Endothelial Cells, Graft Rejection, Heart Transplantation, Humans, Lymphocyte Activation, Papio, Rituximab, Swine, T-Lymphocytes, Transplantation, Heterologous
URI: http://discovery.ucl.ac.uk/id/eprint/90861
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