Cytokines affecting CD4(+) T regulatory cells in transplant tolerance. Interleukin-4 does not maintain alloantigen specific CD4(+)CD25(+) Treg

Karren Michelle Plain, Nirupama Darshan Verma, Giang T Tran, Masaru Nomura, Rochelle Boyd, Catherine M Robinson, Suzanne J Hodgkinson, Bruce M Hall

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

IL-4 is thought to promote induction of transplantation tolerance and alloantigen-specific CD4(+)CD25(+) T regulatory cells (Treg). This study examined the effect of IL-4 on the induction and maintenance of the CD4(+) T regulatory cells (Treg) that mediate transplantation tolerance. Tolerance was induced in DA rats with PVG heterotopic cardiac allografts by a short course of cyclosporine. Naïve and tolerant lymphocytes, including the CD4(+) and CD4(+)CD25(+) T cell subsets, were assayed in mixed lymphocyte cultures with or without recombinant (r)IL-4 or other cytokines. The proliferation, cell surface and cytokine phenotype of these cells was examined, as was their capacity to adoptively transfer tolerance. rIL-4 enhanced the proliferation of naïve and tolerant lymphoid cells, including CD4(+) and CD4(+)CD25(+) T cells, but this was not alloantigen specific. Naïve or tolerant CD4(+) T cells cultured with rIL-4 and donor PVG antigen effected rapid graft rejection, even though before culture tolerant CD4(+) T cells transferred antigen-specific tolerance. These rIL-4 cultured CD4(+) T cells had a phenotype consistent with activated CD4(+)CD25(+)FoxP3(-) Th2 cells. While naïve natural CD4(+)CD25(+) T cells (nTreg) cultured with alloantigen and rIL-4 had enhanced proliferation and capacity to suppress rejection in vivo, the culture of tolerant CD4(+)CD25(+) T cells with alloantigen and rIL-4 could not sustain their proliferation against specific donor, nor their capacity to transfer tolerance to specific donor allograft. Thus, IL-4 promotes both regulatory and effector T cells early in the immune response, but once alloimmune tolerance is established, IL-4 promoted the activation of effector cells to mediate rejection and did not support alloantigen-specific Treg that could transfer specific tolerance.

Original languageEnglish
Pages (from-to)51-9
Number of pages9
JournalTransplant Immunology
Volume29
Issue number1-4
DOIs
Publication statusPublished - Dec 2013
Externally publishedYes

Keywords

  • Interleukin 4
  • Regulatory T cell
  • Th2 response
  • Transplantation tolerance
  • CD4⁺CD25⁺FoxP3⁺ Treg

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