Abstract
We have recently reported that the intra-tumoral injection of adrenomedullin (AM) antagonist (AMA; AM (22–52)) peptides significantly reduced the in vivo growth of a pancreatic cancer cell line in severely combined immunodeficient (SCID) mice. In the present study, we examined the effects of intra-tumoral and intra-muscular transfers of naked DNA encoding AMA on the in vivo growth of cancer cell lines. We demonstrate that these treatments induce the regression of a pancreatic cancer cell line and a breast cancer cell line inoculated in SCID mice. Furthermore, CD31-positive cells disappear completely from tumor tissues, following treatment, indicating that neo-vascularization is entirely inhibited. These results suggest that the intra-tumoral or intra-muscular transfer of naked DNA encoding AMA might be a promising alternative modality for treating human cancers.
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Acknowledgements
We thank Dr Jun-ichi Hamada (Division of Cancer Related genes, Institute for Genetic Medicine) and Dr Hiroshi Ishikura (The First Department of Pathology, Hokkaido University School of Medicine) for providing us with the cell lines. We thank Ms M Yanome for her assistance in preparing the manuscript. This work was supported in part by Grants-in-Aid for Cancer Research from the Japanese Ministry of Education, Culture, Sports and Science.
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Miseki, T., Kawakami, H., Natsuizaka, M. et al. Suppression of tumor growth by intra-muscular transfer of naked DNA encoding adrenomedullin antagonist. Cancer Gene Ther 14, 39–44 (2007). https://doi.org/10.1038/sj.cgt.7700979
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DOI: https://doi.org/10.1038/sj.cgt.7700979
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