CD4+CD25+Tregs express an increased LAG-3 and CTLA-4 in anterior chamber-associated immune deviation

Graefes Arch Clin Exp Ophthalmol. 2007 Oct;245(10):1549-57. doi: 10.1007/s00417-007-0591-8. Epub 2007 May 31.

Abstract

Background: Regulatory CD4(+)CD25(+) T cells have been proven to be essential for maintenance of peripheral tolerance and autoimmune diseases. ACAID is a model of immune privilege in the eye. Relatively little is known about the role and phenotype of these regulatory CD4(+)CD25(+) T cells in ACAID.

Methods: Injection of OVA into the anterior chamber of BALB/C mice was performed to induce ACAID. The frequencies of splenic CD4(+)CD25(+) Tregs and the expression of CTLA-4 and LAG-3 on these cells were determined by flow cytometry. Magnetic cell sorting was used to isolate CD4(+)CD25(+) and CD4(+)CD25(-)T cells. The function of CD4(+)CD25(+) T cells was detected by in vitro immunosuppression assays and in vivo adoptive transfer.

Results: ACAID was successfully induced following an i.c. injection of OVA. Frequencies of CD4(+)CD25(+) and Tregs were significantly increased in ACAID mice as compared to those in controls. The CD4(+)CD25(+) T cells stimulated with OVA in ACAID mice showed a stronger suppressive ability in vitro than those seen in non-ACAID mice. CD4(+)CD25(+) T cells from ACAID mice, but not from non-ACAID mice, were able to suppress DTH responses in an antigen-specific manner following adoptive transfer. The frequencies of CTLA-4 or LAG-3 on Tregs in ACAID mice were higher as compared with those in naive mice.

Conclusion: Splenic CD4(+)CD25(+)Foxp3(+)T cells expressing CTLA4 and LAG3 play an important role in the induction of ACAID.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adoptive Transfer
  • Animals
  • Anterior Chamber / immunology*
  • Antigen-Presenting Cells / immunology
  • Antigens, CD / metabolism*
  • Antigens, Differentiation / metabolism*
  • CD4 Antigens / immunology*
  • CD4-Positive T-Lymphocytes / immunology
  • CTLA-4 Antigen
  • Female
  • Flow Cytometry
  • Hypersensitivity, Delayed / immunology
  • Immunophenotyping
  • Interleukin-2 Receptor alpha Subunit / immunology*
  • Lymphocyte Activation Gene 3 Protein
  • Mice
  • Mice, Inbred BALB C
  • Ovalbumin / immunology
  • Spleen / cytology
  • T-Lymphocytes, Regulatory / physiology*

Substances

  • Antigens, CD
  • Antigens, Differentiation
  • CD4 Antigens
  • CTLA-4 Antigen
  • Ctla4 protein, mouse
  • Interleukin-2 Receptor alpha Subunit
  • Ovalbumin
  • Lymphocyte Activation Gene 3 Protein
  • Lag3 protein, mouse