Control of T cell reactivation by regulatory Qa-1-restricted CD8 + T cells

Aditi Varthaman, Jamila Khallou-Laschet, Marc Clement, Giulia Fornasa, Hye Jung Kim, Anh Thu Gaston, Michael Dussiot, Giuseppina Caligiuri, André Herbelin, Srinivas Kaveri, Harvey Cantor, Antonino Nicoletti

Research output: Contribution to journalArticlepeer-review

Abstract

Administration of attenuated pathogenic T cell clones, a procedure known as T cell vaccination, induces CD8+ T cells specific for peptides derived from the Vβ-chain of the TCR presented by the MHC class Ib molecule, Qa-1 expressed on the vaccine cells. These regulatory CD8+ T cells have the capacity to control the activation of endogenous T cells expressing the same TCR Vβ-chain as the vaccinating cells. We hypothesized that vaccination with NKT cells could also induce Qa-1-restricted CD8 + T cells that would control NKT cell activation. We tested this hypothesis in a murine model of Con A-induced hepatitis that is induced by NKT cells. Vaccination with NKT cells effectively induced protective Qa-1-restricted CD8+ T cells that prevented hepatitis. Surprisingly, upon vaccination with T cells expressing Vβ-chains irrelevant to NKT cells, we discovered that the specificity of vaccine-induced Qa-1-restricted CD8 + T cells was not limited to the Vβ-chain of the vaccinating cells. We further show that these regulatory Qa-1-restricted CD8+ T cells arise spontaneously upon polyclonal activation of T cells in the absence of deliberate T cell vaccination. These experiments provide new insight into a CD8+ T cell compartment that regulates the immediate reactivation of conventional T cells and NKT cells.

Original languageEnglish
Pages (from-to)6585-6591
Number of pages7
JournalJournal of Immunology
Volume184
Issue number12
DOIs
Publication statusPublished - Jun 15 2010

ASJC Scopus subject areas

  • Immunology
  • Medicine(all)

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