Melanoma cells treated with GGTI and IFN-gamma allow murine vaccination and enhance cytotoxic response against human melanoma cells.

Suboptimal activation of T lymphocytes by melanoma cells is often due to the defective expression of class I major histocompatibility antigens (MHC-I) and costimulatory molecules. We have previously shown that geranylgeranyl transferase inhibition (done with GGTI-298) stimulates anti-melanoma immune response through MHC-I and costimulatory molecule expression in the B16F10 murine model [1].
In this study, it is shown that vaccination with mIFN-gand GGTI-298 pretreated B16F10 cells induces a protection against untreated tumor growth and pulmonary metastases implantation. Furthermore, using a human melanoma model (LB1319-MEL), we demonstrated that in vitro treatment with hIFN-gamma and GGTI-298 led to the up regulation of MHC-I and a costimulatory molecule CD86 and down regulation of an inhibitory molecule PD-1L. Co-culture experiments with peripheral blood mononuclear cells (PBMC) revealed that modifications induced by hIFN-gamma and GGTI-298 on the selected melanoma cells, enables the stimulation of lymphocytes from HLA compatible healthy donors. Indeed, as compared with untreated melanoma cells, pretreatment with hIFN-gamma and GGTI-298 together rendered the melanoma cells more efficient at inducing the: i) activation of CD8 T lymphocytes (CD8+/CD69+); ii) proliferation of tumor-specific CD8 T cells (MelanA-MART1/TCR+); iii) secretion of hIFN-gamma; and iv) anti-melanoma specific cytotoxic cells.
These data indicate that pharmacological treatment of melanoma cell lines with IFN-gamma and GGTI-298 stimulates their immunogenicity and could be a novel approach to produce tumor cells suitable for vaccination and for stimulation of anti-melanoma effector cells.
AuthorsGuillaume Sarrabayrouse, Christine Pich, Raphaël Moriez, Virginie Armand-Labit, Philippe Rochaix, Gilles Favre, Anne-Françoise Tilkin-Mariamé
JournalPloS one (PLoS One) Vol. 5 Issue 2 Pg. e9043 ( 2010) ISSN: 1932-6203 [Electronic] United States
PMID20140259 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Antigens, CD86
  • Benzamides
  • Cytokines
  • GGTI 298
  • Histocompatibility Antigens Class I
  • Interferon-gamma
  • Animals
  • Antigens, CD86 (immunology, metabolism)
  • Benzamides (pharmacology)
  • Blotting, Western
  • Cell Line, Tumor
  • Coculture Techniques
  • Cytokines (metabolism)
  • Cytotoxicity, Immunologic (immunology)
  • Female
  • Flow Cytometry
  • Histocompatibility Antigens Class I (immunology, metabolism)
  • Humans
  • Interferon-gamma (pharmacology)
  • Jurkat Cells
  • Leukocytes, Mononuclear (cytology, immunology, metabolism)
  • Melanoma (immunology, metabolism, pathology)
  • Melanoma, Experimental (immunology, pathology)
  • Mice
  • Mice, Inbred C57BL
  • T-Lymphocytes (immunology, metabolism)
  • Up-Regulation (drug effects)
  • Vaccination (methods)

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