PMID- 9833762 OWN - NLM STAT- MEDLINE DCOM- 19981204 LR - 20190708 IS - 0020-7136 (Print) IS - 0020-7136 (Linking) VI - 78 IP - 6 DP - 1998 Dec 9 TI - Circulating Melan-A/Mart-1 specific cytolytic T lymphocyte precursors in HLA-A2+ melanoma patients have a memory phenotype. PG - 699-706 AB - Melan-A/MART-1 is a melanoma differentiation antigen that is recognized by a high proportion of cytolytic T lymphocyte (CTL) clones derived from human leukocyte antigen (HLA)-A2+ melanoma patients. Whereas peptide Melan-A/ MART-1(27-35) was originally defined as the immunodominant CTL epitope, we have previously reported that peptide Melan-A/MART-1(26-35) was recognized more efficiently by the majority of tumor-reactive CTL clones. As demonstrated here, CTL populations generated from blood lymphocytes of either melanoma patients or healthy individuals after in vitro stimulation with peptide Melan-A/MART-1(26-35) killed specifically HLA-A2+ Melan-A+ allogeneic melanoma cells, thus suggesting their potential use in adoptive immunotherapy. We characterized the surface phenotype of the circulating CTL precursors (CTLp), which respond to in vitro stimulation with peptide Melan-A/MART-1(26-35). In melanoma patients, these CTLp predominantly expressed the CD45RO memory marker. In contrast, they were mainly, although not exclusively, found in the CD45RA subpopulation of CD8 T cells in healthy individuals. The demonstration that Melan-A/MART-1-specific CTLp in peripheral blood lymphocytes from HLA-A2+ patients with metastatic melanoma express a memory phenotype provides direct evidence that in vivo priming of this antigen may occur during tumor progression. FAU - D'Souza, S AU - D'Souza S AD - Multidisciplinary Oncology Center, CHUV, Lausanne, Switzerland. FAU - Rimoldi, D AU - Rimoldi D FAU - Lienard, D AU - Lienard D FAU - Lejeune, F AU - Lejeune F FAU - Cerottini, J C AU - Cerottini JC FAU - Romero, P AU - Romero P LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Int J Cancer JT - International journal of cancer JID - 0042124 RN - 0 (Antigens, Neoplasm) RN - 0 (HLA-A2 Antigen) RN - 0 (MART-1 Antigen) RN - 0 (MLANA protein, human) RN - 0 (Neoplasm Proteins) RN - EC 3.1.3.48 (Leukocyte Common Antigens) SB - IM MH - Antigens, Neoplasm MH - CD8-Positive T-Lymphocytes/immunology MH - HLA-A2 Antigen/*immunology MH - Humans MH - *Immunologic Memory MH - Leukocyte Common Antigens/metabolism MH - MART-1 Antigen MH - Melanoma/*immunology MH - Neoplasm Proteins/*immunology MH - T-Lymphocytes, Cytotoxic/*immunology EDAT- 1998/12/02 03:03 MHDA- 2000/06/20 09:00 CRDT- 1998/12/02 03:03 PHST- 1998/12/02 03:03 [pubmed] PHST- 2000/06/20 09:00 [medline] PHST- 1998/12/02 03:03 [entrez] AID - 10.1002/(SICI)1097-0215(19981209)78:6<699::AID-IJC6>3.0.CO;2-U [pii] AID - 10.1002/(sici)1097-0215(19981209)78:6<699::aid-ijc6>3.0.co;2-u [doi] PST - ppublish SO - Int J Cancer. 1998 Dec 9;78(6):699-706. doi: 10.1002/(sici)1097-0215(19981209)78:6<699::aid-ijc6>3.0.co;2-u.