PMID: 11920589Mar 29, 2002Paper

Peptide-specific CD8+ T-cell evolution in vivo: response to peptide vaccination with Melan-A/MART-1

International Journal of Cancer. Journal International Du Cancer
Elke JägerM Maeurer

Abstract

Monitoring of CD8+ T-cell responses in cancer patients during peptide vaccination is essential to provide useful surrogate markers and to demonstrate vaccine efficacy. We have longitudinally followed CD8+ T-cell responses in 3 melanoma patients who were immunized with peptides derived from Melan-A/MART-1. Recombinant HLA-A2 tetramers loaded with the naturally presented Melan-A/MART-1 nonamer peptide (AAGIGILTV) and the Melan-A/MART-1 analog (ELAGIGILTV) were used in combination with phenotypical analysis for different T-cell subsets including naive T cells, effector T cells, "true memory" T cells and "memory effector" T cells, based on CD45RA/RO and CCR7-expression. At least in a single patient, T cells binding to the AAGIGILTV epitope were detected in naive, precursor (CD45RA+/CCR7+) CD8+ T cells, and CD8+ T cells binding to the analog ELAGIGILTV peptide were identified in the terminally differentiated (CD45RA+/CCR7-) T-cell subset. Molecular and functional analysis of tetramer-binding T cells revealed that the T-cell receptor (TCR) repertoire was oligo/polyclonal in AAGIGILTV-reactive T cells, but different and restricted to a few TCR clonotypes in ELAGIGILTV-reactive T cells prior to vaccination. The TCR repertoire reactive ...Continue Reading

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