期刊
ONCOGENE
卷 28, 期 45, 页码 4022-4033出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/onc.2009.253
关键词
TGF-beta; PDGF; tumor-stroma interaction; epithelial to mesenchymal transition; spheroid
资金
- FWF [P19598-B13, SFB F28]
- 'Hochschuljubilaumsstiftung der Stadt Wien'
- Herzfelder Family Foundation
- European Union [HEALTH-F4-2008-202047]
The tumor-stroma crosstalk is a dynamic process fundamental in tumor development. In hepatocellular carcinoma (HCC), the progression of malignant hepatocytes frequently depends on transforming growth factor (TGF)-beta provided by stromal cells. TGF-beta induces an epithelial to mesenchymal transition (EMT) of oncogenic Ras-transformed hepatocytes and an upregulation of platelet-derived growth factor (PDGF) signaling. To analyse the influence of the hepatic tumor-stroma crosstalk onto tumor growth and progression, we co-injected malignant hepatocytes and myofibroblasts (MFBs). For this, we either used in vitro-activated p19(ARF) MFBs or in vivo-activated MFBs derived from physiologically inflamed livers of Mdr2/p19(ARF) double-null mice. We show that co-transplantation of MFBs with Ras-transformed hepatocytes strongly enhances tumor growth. Genetic interference with the PDGF signaling decreases tumor cell growth and maintains plasma membrane-located E-cadherin and beta-catenin at the tumor-host border, indicating a blockade of hepatocellular EMT. We further generated a collagen gel-based three dimensional HCC model in vitro to monitor the MFB-induced invasion of micro-organoid HCC spheroids. This invasion was diminished after inhibition of TGF-beta or PDGF signaling. These data suggest that the TGF-beta/PDGF axis is crucial during hepatic tumor-stroma crosstalk, regulating both tumor growth and cancer progression. Oncogene (2009) 28, 4022-4033; doi:10.1038/onc.2009.253; published online 31 August 2009
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