Cytotoxic T lymphocyte antigen-4 (CTLA-4) regulates primary and secondary peptide-specific CD4+ T cell responses

Cynthia A. Chambers, Michael S. Kuhns, James P. Allison

Research output: Contribution to journalArticle

105 Scopus citations

Abstract

CTLA-4-deficient mice develop a fatal lymphoproliferative disorder, characterized by polyclonal expansion of peripheral lymphocytes. To examine the effect of restricting the CD4+ TCR repertoire on the phenotype of CTLA- 4-deficient mice and to assess the influence of CTLA-4 on peptide-specific CD4+ T cell responses in vitro, an MHC class II-restricted T cell receptor (AND TCR) transgene was introduced into the CTLA-4(-/-) animals. The expression of the AND TCR transgene by CD4+ T cells delays but does not prevent the lymphoproliferation in the CTLA-4(-/-) mice. The CD4+ T cells become preferentially activated and expand. Interestingly, young AND TCR+ CTLA-4(-/-) mice carrying a null mutation in the rag-1 gene remain healthy and the T cells maintain a naive phenotype until later in life. We demonstrate that CTLA-4 regulates the peptide-specific proliferative response generated by naive and previously activated AND TCR+ RAG(-/-) T cells in vitro. The absence of CTLA-4 also augments the responder frequency of cytokine-secreting AND TCR+ RAG(-/-) T cells. These results demonstrate that CTLA-4 is a key regulator of peptide-specific CD4+ T cell responses and support the model that CTLA-4 plays a differential role in maintaining T cell homeostasis of CD4+ vs. CD8+ T cells.

Original languageEnglish (US)
Pages (from-to)8603-8608
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume96
Issue number15
DOIs
StatePublished - Jul 20 1999

Keywords

  • CD152
  • Homeostasis
  • Inhibitory costimulation
  • Tolerance

ASJC Scopus subject areas

  • General

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