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Published in: Cancer Immunology, Immunotherapy 5/2008

01-05-2008 | Original Article

Characterization of HLA class I altered phenotypes in a panel of human melanoma cell lines

Authors: Rosa Méndez, Teresa Rodríguez, Ana Del Campo, Eva Monge, Isabel Maleno, Natalia Aptsiauri, Pilar Jiménez, Susana Pedrinaci, Graham Pawelec, Francisco Ruiz-Cabello, Federico Garrido

Published in: Cancer Immunology, Immunotherapy | Issue 5/2008

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Abstract

Background

Altered HLA class I cell surface expression is one of the major mechanisms by which tumor cells escape from T lymphocytes. Immunohistochemistry-defined phenotypes of lost HLA class I expression have been described in human solid tumors, nut less information is available on melanoma cell lines.

Objectives

To describe the frequency and distribution of different types of HLA class I antigen alterations in 91 melanoma cell lines from the European Searchable Tumour Cell and Databank (ESTDAB).

Methods

The HLA class I expression was assessed by flow cytometry and HLA genotyping.

Results

We found various types of HLA class I cell surface alterations in about 67% of the melanoma cell lines. These alterations range from total to selective HLA class I loss due to loss of heterozygosity (LOH), haplotype loss, β2-microglobulin gene mutation, and/or total or selective down-regulation of HLA class I molecules. The most frequently observed phenotype is down-regulation of HLA-B locus that was reversible after treatment with IFN -γ.

Conclusions

In general, HLA class I alterations in the majority of the cells analyzed were of regulatory nature and could be restored by IFN-γ. Analysis of the frequency of distinct HLA class I altered phenotypes in these melanoma cell lines revealed specific differences compared to other types of tumors.
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Metadata
Title
Characterization of HLA class I altered phenotypes in a panel of human melanoma cell lines
Authors
Rosa Méndez
Teresa Rodríguez
Ana Del Campo
Eva Monge
Isabel Maleno
Natalia Aptsiauri
Pilar Jiménez
Susana Pedrinaci
Graham Pawelec
Francisco Ruiz-Cabello
Federico Garrido
Publication date
01-05-2008
Publisher
Springer-Verlag
Published in
Cancer Immunology, Immunotherapy / Issue 5/2008
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-007-0411-3

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