Abstract
Since it is reported that adrenomedullin (AM) upregulated by hypoxia inhibits hypoxic cell death, we examined the effects of AM antagonist (AM C-terminal fragment; AM(22–52)) on the growth of pancreatic cancer cells. We, for the first time, demonstrated that AM antagonist significantly reduced the in vivo growth of the pancreatic cancer cell line. Immunohistochemical analysis demonstrated that the mean diameter of blood vessels was significantly smaller in the tumor tissues treated with AM antagonist than in those treated with AM N-terminal fragment (AM(1–25)), and that the PCNA-labeling index was lower in the former than in the latter. Then we demonstrated that AM antagonist showed no effect on the in vitro growth of the pancreatic cancer cell line. These results showed that AM played an important role in the growth of pancreatic cancer cells in vivo, suggesting that AM antagonist might be a useful tool for treating pancreatic cancers.
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Acknowledgements
This work was supported in part by grants from the Japanese Ministry of Education, Culture, Sports, Science and Technology. We appreciate Dr Hiroshi Ishikura (The First Department of Pathology, Hokkaido University School of Medicine) and Dr Yutaka Shimada (Department of Surgery & Surgical Basic Science, Graduate School of Medicine, Kyoto University) for providing us with a pancreatic cancer cell line. We thank Ms M Yanome for assistance in preparing the manuscript.
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Ishikawa, T., Chen, J., Wang, J. et al. Adrenomedullin antagonist suppresses in vivo growth of human pancreatic cancer cells in SCID mice by suppressing angiogenesis. Oncogene 22, 1238–1242 (2003). https://doi.org/10.1038/sj.onc.1206207
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DOI: https://doi.org/10.1038/sj.onc.1206207
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