Abstract
Resistance to growth inhibitory effects of transforming growth factor (TGF)-β is a frequent consequence of malignant transformation. On the other hand, serum concentrations of TGF-β, plasminogen activator inhibitor type 1 (PAI-1), and vascular endothelial growth factor (VEGF) are elevated as tumor progresses. The molecular mechanism of autocrine TGF-β signaling and its effects on PAI-1 and VEGF production in human hepatocellular carcinoma (HCC) is unknown. TGF-β signaling involves TGF-β type I receptor-mediated phosphorylation of serine residues within the conserved SSXS motif at the C-terminus of Smad2 and Smad3. To investigate the involvement of autocrine TGF-β signal in cell growth, PAI-1 and VEGF production of HCC, we made stable transfectants of human HCC line (HuH-7 cells) to express a mutant Smad2(3S-A), in which serine residues of SSXS motif were changed to alanine. The transfectants demonstrated an impaired Smad2 signaling. Along with the resistance to growth inhibition by TGF-β, forced expression of Smad2(3S-A) induced endogenous TGF-β secretion. Moreover, this increased TGF-β enhanced ligand-dependent signaling through the activated Smad3 and Smad4 complex, and transcriptional activities of PAI-1 and VEGF genes. In conclusion, distortion of autocrine TGF-β signals in human HCC accelerates their malignant potential by enhancing cell growth as well as PAI-1 and VEGF production.
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Acknowledgements
We thank Dr SW Qian (National Cancer Institute, Bethesda, MD, USA), Dr R Derynck (University of California at San Francisco, San Francisco, CA, USA), Drs CH Heldin, and K Miyazono (Ludwig Institute for Cancer Research) for providing us with cDNAs of rat TGF-β1, human Smad2, Smad3, Smad4, and human TβRI in this study.
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Sugano, Y., Matsuzaki, K., Tahashi, Y. et al. Distortion of autocrine transforming growth factor β signal accelerates malignant potential by enhancing cell growth as well as PAI-1 and VEGF production in human hepatocellular carcinoma cells. Oncogene 22, 2309–2321 (2003). https://doi.org/10.1038/sj.onc.1206305
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DOI: https://doi.org/10.1038/sj.onc.1206305
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