HLA-E-restricted recognition of cytomegalovirus-derived peptides by human CD8+ cytolytic T lymphocytes

Gabriella Pietra, Chiara Romagnani, Paola Mazzarino, Michela Falco, Enrico Millo, Alessandro Moretta, Lorenzo Moretta, Maria Cristina Mingari

Research output: Contribution to journalArticlepeer-review


HLA-E-restricted T cell receptor αβ+ CD8+ cytolytic T lymphocytes (CTLs) exist as monoclonal expansions in the peripheral blood of some individuals. Here, we show that they recognize, with high avidity, peptides derived from the UL40 protein of different human cytomegalovirus (CMV) strains. Recognition results in the induction of cytotoxicity, IFN-γ production and cell proliferation. Autologous cells pulsed with CMV-derived peptides become susceptible to lysis by HLA-E-restricted CTLs and induce their proliferation. The high avidity for CMV-derived peptides may explain how these cells are generated in vivo and suggest their possible role in the host defenses against CMV, a virus that evolved various mechanisms to down-regulate classical HLA class I molecules, thus escaping detection by conventional CTLs.

Original languageEnglish
Pages (from-to)10896-10901
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number19
Publication statusPublished - Sep 16 2003

ASJC Scopus subject areas

  • Genetics
  • General


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