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Correspondence to: Daniel E. Speiser, Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, CHUV - BH 19-602, CH-1011 Lausanne, Switzerland. Tel:41-21-314-01-82 Fax:41-21-314-74-77 E-mail:daniel.speiser{at}hospvd.ch.
Natural killer (NK) receptor signaling can lead to reduced cytotoxicity by NK cells and cytolytic T lymphocytes (CTLs) in vitro. Whether T cells are inhibited in vivo remains unknown, since peptide antigenspecific CD8+ T cells have so far not been found to express NK receptors in vivo. Here we demonstrate that melanoma patients may bear tumor-specific CTLs expressing NK receptors. The lysis of melanoma cells by patient-derived CTLs was inhibited by the NK receptor CD94/NKG2A. Thus, tumor-specific CTL activity may be decreased through NK receptor triggering in vivo.
Key Words: cytolytic T lymphocytes, natural killer receptors, melanoma, tumor immunity, peptide antigen
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