Abstract
SMAD4 is a critical cofactor in signal transduction pathways activated in response to transforming growth factor-beta (TGF-β)-related ligands, regulating cell growth and differentiation. The roles played by SMAD4 inactivation in tumours highlighted it as a tumour-suppressor gene. However, restoration of the TGF-β antiproliferative pathway following SMAD4 gene transfer in null-tumour cell lines is controversial. Herein, we report the inhibitory effects of SMAD4 on pancreatic tumour invasion and angiogenesis. Adenoviral transfer of this gene in a panel of SMAD4 homozygous-deleted human pancreatic tumour cell lines restored SMAD4 protein expression and function. Although it did not affect proliferation significantly in vitro, SMAD4 inhibited in vivo tumour growth in immunodeficient mice. In this xenograft setting, differential suppression of tumour growth in vivo was mediated, at least in part, through downregulation of vascular endothelial growth factor and expression of gelatinases. We documented the reduced invasion and angiogenesis histologically and by intravital microscopy, and gained mechanistic insight at the messenger and protein level. Finally, we found a negative reciprocal regulation between SMAD4 and ETS-1. ETS-1 is considered a marker for tumour invasion. Upon SMAD4 deletion, we detected high expression levels of ETS-1 in pancreatic tumour cells, suggesting the shift of the pancreatic tumour toward an invasive phenotype.
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Acknowledgements
This work was supported in part by two grants-in-aid for scientific research (14657277) from the Japanese Ministry of Education, Culture, Sports, Science and Technology and grants-in-aid for cancer research from the Ministry of Health, Labour and Welfare of Japan. We thank Drs Kohei Miyazono (Department of Biochemistry, The Cancer Institute, Tokyo, Japan) and Yasufumi Sato (Department of Vascular Biology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan) for supplying the adenoviral constructs. We are grateful to Emiko Shibuya, Hiroko Fujimura, and Keiko Inabe at Tohoku University School of Medicine (Sendai, Japan) for their expert technical assistance.
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Duda, D., Sunamura, M., Lefter, L. et al. Restoration of SMAD4 by gene therapy reverses the invasive phenotype in pancreatic adenocarcinoma cells. Oncogene 22, 6857–6864 (2003). https://doi.org/10.1038/sj.onc.1206751
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DOI: https://doi.org/10.1038/sj.onc.1206751
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