CD95 ligand (FasL)-induced apoptosis is necessary for corneal allograft survival

P. Michael Stuart, Thomas S. Griffith, Norio Usui, Jay Pepose, Xinhong Yu, Thomas A. Ferguson

Research output: Contribution to journalArticlepeer-review

323 Scopus citations

Abstract

Although anatomical barriers and soluble mediators have been implicated in immune privilege, it appears that the apoptotic cell death of Fas+ cells by tissue-associated CD95 ligand (Fas ligand, FasL) is an important component. One clinical example of the function of an immune privileged site is the success of human corneal transplants, where a very high percentage of transplants accept without tissue matching or immunosuppressive therapy. Since the mouse cornea expresses abundant Fas ligand and immune privilege has been implicated in the success of these transplants, we examined the role of FasL in corneal transplantation. Our results show that human corneas express functional FasL capable of killing Fas+ lymphoid cells in an in vitro culture system. Using a mouse model for corneal allograft transplantation, FasL+ orthografts were accepted at a rate of 45%, whereas FasL- grafts, or normal grafts transplanted to Fas- mice, were rejected 100% of the time. Histological analysis found that FasL+ grafts contained apoptotic mononuclear cells indicating the induction of apoptosis by the graft, while rejecting FasL- corneas contained numerous inflammatory cells without associated apoptosis. Taken together our results demonstrate that FasL expression on the cornea is a major factor in corneal allograft survival and, thus, we provide an explanation for one of the most successful tissue transplants performed in humans.

Original languageEnglish (US)
Pages (from-to)396-402
Number of pages7
JournalJournal of Clinical Investigation
Volume99
Issue number3
DOIs
StatePublished - Feb 1 1997

Keywords

  • Cell death
  • Fas ligand
  • Immune privilege
  • Keratoplasty
  • Transplantation

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