Abstract | PURPOSE: EXPERIMENTAL DESIGN: The effect of 5-aza-CdR on the constitutive expression of gp100 was investigated in 11 human melanoma cell lines by real-time reverse transcription-PCR and indirect immunofluorescence (IIF) analyses. 5-aza-CdR-mediated changes in the levels of expression of human leukocyte antigen (HLA) class I antigens and HLA-A2 allospecificity, intercellular adhesion molecule-1 (ICAM-1), and leukocyte-function-associated antigen-3 were investigated by IIF analysis on melanoma cells under study. The recognition of gp100-positive Mel 275 melanoma cells, treated or not with 5-aza-CdR, by HLA-A2-restricted gp100((209-217))-specific CTL was investigated by (51)Cr-release assays, IFN-gamma release and IFN-gamma ELISPOT assays. RESULTS: The constitutive expression of gp100 was not affected by 5-aza-CdR on all melanoma cells investigated. Compared with untreated cells, the exposure of Mel 275 melanoma cells to 5-aza-CdR significantly (P < 0.05) up-regulated their expression of HLA class I antigens and of ICAM-1. These phenotypic changes significantly (P < 0.05) increased the lysis of 5-aza-CdR-treated Mel 275 melanoma cells by gp100-specific CTL and increased their IFN-gamma release. 5-aza-CdR treatment of Mel 275 cells also induced a higher number of gp100-specific CTL to secrete IFN-gamma. CONCLUSIONS: Treatment with 5-aza-CdR improves the recognition of melanoma cells by gp100-specific CTL through the up-regulation of HLA class I antigens expression; ICAM-1 also contributes to this phenomenon. These findings highlight a broader range of therapeutic implications of 5-aza-CdR when used in association with active or adoptive immunotherapeutic approaches against a variety of melanoma-associated antigens.
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Authors | Ester Fonsatti, Hugues J M Nicolay, Luca Sigalotti, Luana Calabrò, Laura Pezzani, Francesca Colizzi, Maresa Altomonte, Massimo Guidoboni, Francesco M Marincola, Michele Maio |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 13
Issue 11
Pg. 3333-8
(Jun 01 2007)
ISSN: 1078-0432 [Print] United States |
PMID | 17545540
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Histocompatibility Antigens Class I
- Membrane Glycoproteins
- PMEL protein, human
- gp100 Melanoma Antigen
- Decitabine
- Interferon-gamma
- Azacitidine
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Topics |
- Azacitidine
(analogs & derivatives, pharmacology)
- Cell Line, Tumor
- Decitabine
- Fluorescent Antibody Technique, Indirect
- Gene Expression Regulation, Neoplastic
- Histocompatibility Antigens Class I
(biosynthesis)
- Humans
- Immunotherapy
(methods)
- Interferon-gamma
(metabolism)
- Melanoma
(drug therapy, immunology)
- Membrane Glycoproteins
(metabolism)
- Reverse Transcriptase Polymerase Chain Reaction
- Skin Neoplasms
(drug therapy, immunology)
- T-Lymphocytes, Cytotoxic
(immunology, metabolism)
- Up-Regulation
- gp100 Melanoma Antigen
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