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This article is part of the supplement: 24th Annual Meeting of the National Cancer Institute of Mexico

Open Access Meeting abstract

Up-regulation of HLA class I antigen expression and antigen-specific CTL response in cervical cancer cells by the demethylating hydralazine and the histone deacetylase inhibitor valproic acid

María de Lourdes Mora-García1*, Alfonso Duenas-González2, Jorge Hernández-Montes1, Benny Weiss-Steider1, Edelmiro Santiago-Osorio3, Vianney Francisco Ortíz-Navarrete4, Víctor Hugo Rosales4, David Cantú2, Marcela Lizano-Soberón2 and Alberto Monroy-García5

  • * Corresponding author: María L Mora-García

Author Affiliations

1 Laboratorio de Inmunobiología, Unidad de Investigación en Diferenciación Celular y Cáncer. FES-Zaragoza, UNAM, México

2 Unidad de Investigación Biomédica en Cáncer, Instituto de Investigaciones Biomédicas, UNAM, Instituto Nacional de Cancerología, México

3 Laboratorio de Biología Molecular del Cáncer, Unidad de Investigación en Diferenciación Celular y Cáncer, FES-Zaragoza, UNAM, México

4 Departamento de Biomedicina, CINVESTAV, IPN, México

5 Unidad de Investigación Médica en Enfermedades Oncológicas. IMSS, CMN SXXI, México

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BMC Cancer 2007, 7(Suppl 1):A12  doi:10.1186/1471-2407-7-S1-A12

The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2407/7/S1/A12


Published:5 February 2007

© 2007 Mora-García et al; licensee BioMed Central Ltd.

Background

DNA hypermethylation and histone deacetylation are epigenetic events that contribute to the absence or downregulated expression of different components of the tumor recognition complex. These events affect the processing and presentation of antigenic peptides to CTLs by HLA class I molecules. In this work we evaluated the effect of the DNA hypomethylating agent hydralazine (H) and the histone deacetylase inhibitor valproic acid (VA), on the expression of HLA class I molecules and in the antigen-specific immune recognition of cervical cancer cells.

Materials and methods

Cell lines C33A (HPV-), CaSki (HPV-16+) and MS751 (HPV-18+) were treated with hydralazine and valproic acid to assess cell proliferation and to evaluate the expression of HLA class I molecules on cell surface by flow cytometry. Primary cervical tumors of five HLA-A*0201 allele patients were typed for HPV and their CTLs stimulated in vitro with the T2 cell line previously loaded with 50 μM of the HPV peptides. Cytotoxicity of stimulated CTLs was assayed against Caski and MS751 cells pre-treated with hydralazine and valproic acid.

Results

The combination of HV acid had antiproliferative effect in C33 and CasKi cells. VA and VA+H up-regulated the constitutive HLA class I expression as evaluated by flow cytometry. In addition, the antigenic immune recognition of CaSki and MS751 cells by CTLs specific to HPV-16/18 E6 and E7-derived epitopes, was more prominent on cells treated with VA or H+VA than cells treated with either H or IFN-γ.

Conclusion

These results support the potential use of H and VA as an adjunt for immune intervention in cervical cancer patients whenever clinical protocols based on tumor antigen recognition is desirable, such as in those cases where the application of E6 and E7 based therapeutic vaccines is used.