Islet xenotransplantation using gal-deficient neonatal donors improves engraftment and function

P. Thompson, I. R. Badell, M. Lowe, J. Cano, M. Song, F. Leopardi, J. Avila, R. Ruhil, E. Strobert, G. Korbutt, G. Rayat, R. Rajotte, N. Iwakoshi, C. P. Larsen, A. D. Kirk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

Significant deficiencies in understanding of xenospecific immunity have impeded the success of preclinical trials in xenoislet transplantation. Although galactose-α1,3-galactose, the gal epitope, has emerged as the principal target of rejection in pig-to-primate models of solid organ transplant, the importance of gal-specific immunity in islet xenotransplant models has yet to be clearly demonstrated. Here, we directly compare the immunogenicity, survival and function of neonatal porcine islets (NPIs) from gal-expressing wild-type (WT) or gal-deficient galactosyl transferase knockout (GTKO) donors. Paired diabetic rhesus macaques were transplanted with either WT (n = 5) or GTKO (n = 5) NPIs. Recipient blood glucose, transaminase and serum xenoantibody levels were used to monitor response to transplant. Four of five GTKO versus one of five WT recipients achieved insulin-independent normoglycemia; transplantation of WT islets resulted in significantly greater transaminitis. The WT NPIs were more susceptible to antibody and complement binding and destruction in vitro. Our results confirm that gal is an important variable in xenoislet transplantation. The GTKO NPI recipients have improved rates of normoglycemia, likely due to decreased susceptibility of xenografts to innate immunity mediated by complement and preformed xenoantibody. Therefore, the use of GTKO donors is an important step toward improved consistency and interpretability of results in future xenoislet studies.

Original languageEnglish
Pages (from-to)2593-2602
Number of pages10
JournalAmerican Journal of Transplantation
Volume11
Issue number12
DOIs
StatePublished - Dec 2011
Externally publishedYes

Keywords

  • Costimulation blockade
  • Gal knockout
  • innate immunity
  • porcine islets
  • transgenic pigs
  • xenotransplantation

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