Abstract
Aberrant Notch signaling and Ras pathway had been highlighted a potential role for in human cancers. Yet, relatively little was known about the roles of wild type Notch signaling and Ras in human hepatocarcinogenesis. The aim of this study was to investigate the roles of Ras-Notch signaling cooperation in hepatic cells transformation and proliferation. Hepatocellular carcinoma specimens from 25 patients were analyzed for Notch-1, Ras and Late Simian Virus 40 Factor (LSF) expression using immunohistochemistry. Results showed that Notch-1(76%, 19/25, P < 0.0001), Ras (40%, 10/25, P < 0.01) and LSF (84%, 21/25, P < 0.0001) were significantly up-regulated in hepatocellular carcinoma compared with non-cancer samples. The correlations between the expression and the biological effects of Notch1 and Ras were analyzed by genetic and pharmacological methods. Constitutively active Notch1 alone failed to transform immortalized L02 cells in vivo, it synergized with the Ras pathway to promote hepatic cells transformation. However, their cooperation increased the levels of LSF mRNA and protein, which stimulates L02 cells proliferation. These results exhibited highly aggressive progression, suggesting that Notch-Ras cooperation maybe lead to poor prognosis. Thus, combining the inhibition of the two pathways provided an attractive avenue for therapeutic intervention to overcome this advanced disease.
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Abbreviations
- DAPT:
-
N-(N-[3,5-difluorophenacetyl]-L-alanyl)-Sphenylglycine t-butyl ester
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Acknowledgments
We gratefully acknowledge the contributions of Dr.Youwei Zhang and Xiaodong Bu for HCC specimens collection, helpful suggestions and discussions and Dongfeng Liu for paraffin sections manufacture. We thank Dr. Xianfeng Cheng for support on the research. This study is supported by the National Natural Science Foundation of China (No. 30470780).
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Fan, R., Chen, P., Zhao, D. et al. Cooperation of deregulated Notch signaling and Ras pathway in human hepatocarcinogenesis. J Mol Hist 42, 473–481 (2011). https://doi.org/10.1007/s10735-011-9353-3
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DOI: https://doi.org/10.1007/s10735-011-9353-3