Abstract
Malignant mesothelioma (MM) is a lethal tumor linked with a prior exposure to asbestos in which limited progress has been made so far using conventional therapies. MM is an example of a “nonimmunogenic” tumor characterized by a fibrous stroma and an absence of infiltrating T lymphocytes. High levels of transforming growth factor-beta (TGF-β) produced by mesothelioma cells have been related to the immune tolerance towards the tumor. In order to evaluate the effect of local delivery of cytokines such as interferon gamma (IFN-γ) by gene transfer, we characterized and used a murine model, AK7, which appeared very similar to human mesothelioma. AK7 cells expressed low levels of major histocompatibility class I and class II antigens and secreted high levels of latent TGF-β. The TGF-β pathway in AK7 cells is operative but inefficient because endogenous TGF-β is predominantly inactive. Treatment of pre-established AK7 tumors by direct intratumoral injection of an adenovirus vector expressing murine IFN-γ, Ad.mIFN-γ, led to significant tumor regression. Peripheral tumor infiltration by CD4+ and CD8+ T lymphocytes in the treated tumors appeared to be because of the induction of an immune response. Tumor relapse was observed, which could be due to local TGF-β secretion by remaining tumor cells.
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Acknowledgements
This work was supported by the CNRS, the Association pour la Recherche sur le Cancer (ARC), the Ligue Nationale Contre le Cancer, the Institut Gustave Roussy, the Assistance pubique-hopitaux de Paris (AP-HP), the Fondation pour la recherche médicale (FRM) (LV), and by a research grant (RO1 ES 03189) from the National Institute of Environmental Health Sciences (AK). MAA had a MRC fellowship. We thank Patrice Ardouin and all the staff of the laboratory of animal experimentation (IGR), Jean-Pierre Levraud for providing oligonucleotides and his help for PCR analysis and Professor CH Heldin for providing the antibodies specific to Smad7 and phosphorylated Smad2. We also thank Dr J Dando and Professor Zaghouani for corrections of the manuscript. We are grateful to the Vector Core of the University Hospital of Nantes supported by the Association Française contre les Myopathies (AFM) for providing the Ad.TGFβ vector.
LCK present address: cell genesys, Inc, South San Francisco, CA 94080, USA
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Cordier Kellerman, L., Valeyrie, L., Fernandez, N. et al. Regression of AK7 malignant mesothelioma established in immunocompetent mice following intratumoral gene transfer of interferon gamma. Cancer Gene Ther 10, 481–490 (2003). https://doi.org/10.1038/sj.cgt.7700594
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DOI: https://doi.org/10.1038/sj.cgt.7700594
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