Involvement of graft-derived interleukin-15 in islet allograft rejection in mice

Eli C. Lewis, Michal Weiler, Noa Tejman-Yarden, Nadav Ziv, Julia Mazar, Cidio Chaimovitz, Amos Douvdevani

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The possibility that islets play a role in graft rejection during islet transplantation for type-1 diabetes patients holds promise for ex vivo islet manipulation and for specific anti-rejection therapy. Interleukin (IL)-15 is a T cell growth factor and chemoattractant that is expressed by non-T cells. Intragraft expression of IL-15 is elevated during acute rejection in patients and in mice, and systemic blockade of IL-15 in mice prolongs allograft survival. However, the source of IL-15 in these conditions is undetermined. Since epithelial cell-derived IL-15 promotes lymphocyte proliferation in culture, we sought to determine whether islet-derived IL-15 promotes rejection in mice.We designed antisense oligodeoxyribonucleotide molecules that target mouse IL-15. Uptake of FITC-labeled antisense molecules and efficacy of IL-15 inhibition in IFNγ-stimulated islets were evaluated. Islets exhibited typical cytoplasmatic distribution of antisense molecules and produced IL-15 levels that were comparable to non-stimulated cells. Antisense-treated islet allografts, that were transplanted across multiple minor-histocompatibility-antigen mismatched strains of mice, were accepted at a higher rate than control-antisense treated islets or untreated islets (88.9% vs. 37.5% and 20%, respectively). Our results suggest that islet-derived IL-15 may be involved in acute islet allograft rejection.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalCytokine
Volume34
Issue number1-2
DOIs
StatePublished - 21 Apr 2006
Externally publishedYes

Keywords

  • Antisense oligodeoxyribonucleotides
  • Immunosuppression
  • Minor histocompatibility antigens

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Biochemistry
  • Hematology
  • Molecular Biology

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