CTLA-4 regulates tolerance induction and T cell differentiation in vivo

Theresa L. Walunas, Jeffrey A. Bluestone*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

147 Scopus citations


Cytotoxic T lymphocyte Ag-4 (CTLA-4; CD152) is an important T cell regulatory molecule. In vitro experiments have shown that the blockade of signals through CTLA-4 augments T cell expansion, while CTLA-4 cross-linking results in decreased T cell proliferation due to decreased IL-2 production. However, less is known about the role of CTLA-4 in regulating an ongoing immune response. In this study, we examined the role of CTLA-4 in the expansion, decline, tolerization, and differentiation of T cells following treatment with staphylococcal enterotoxin B (SEB). Anti-CTLA-4 treatment resulted in increased numbers of SEB-reactive T cells and blockade of subsequent tolerance induction. Further examination of the SEB-reactive cells from anti-CTLA-4-treated mice demonstrated that both the CD4+ and CD8+ Vβ8+ T cells produced IL-4, providing evidence that not only do signals through CTLA-4 regulate T cell-tolerizing events, but they also play an important role in the differentiation of T cells in vivo.

Original languageEnglish (US)
Pages (from-to)3855-3860
Number of pages6
JournalJournal of Immunology
Issue number8
StatePublished - Apr 15 1998

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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