; Weiss, Thomas S.
; Ruemmele, Petra ; Kollmar, Otto ; Hoffmann, Patrick ; Grässer, Friedrich ; Allgayer, Heike ; Fabian, Jasmin ; Weng, Hong Lei ; Teufel, Andreas ; Maass, Thorsten ; Meyer, Christoph ; Lehmann, Ulrich ; Zhu, Cheng ; Mertens, Peter R. ; Gao, Chun Fang ; Dooley, Steven ; Meindl-Beinker, Nadja M. | Item type: | Article | ||||||
|---|---|---|---|---|---|---|---|
| Open Access Type: | No Open Access | ||||||
| Journal or Publication Title: | Clinical Science | ||||||
| Publisher: | PORTLAND PRESS LTD | ||||||
| Place of Publication: | LONDON | ||||||
| Volume: | 128 | ||||||
| Number of Issue or Book Chapter: | 11 | ||||||
| Page Range: | pp. 761-774 | ||||||
| Date: | June 2015 | ||||||
| Institutions: | Medicine > Lehrstuhl für Innere Medizin I Medicine > Lehrstuhl für Kinder- und Jugendmedizin Medicine > Lehrstuhl für Pathologie | ||||||
| Projects (Historical): | ESF Baden Württemberg [Margarete von Wrangell Stipend], Deutsche Forschungsgemeinschaft (DFG) [grant number SFB-TRR77], BMBF [Virtual Liver network, VLN], EU [IT-Liver consortium, Marie Curie Training Network] | ||||||
| Identification Number: |
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| Keywords: | GROWTH-FACTOR-BETA; COLLAGEN GENE-EXPRESSION; TGF-BETA; INTERFERON-GAMMA; MICE; HEPATOCARCINOGENESIS; REGENERATION; PROTEIN-1; APOPTOSIS; FIBROSIS; hepatocellular carcinoma (HCC); human tissue; liver cancer; transforming growth factor beta (TGF-beta); Y-box protein-1 (YB-1) | ||||||
| Dewey Decimal Classification: | 600 Technology > 610 Medical sciences Medicine | ||||||
| Status: | Published | ||||||
| Refereed: | Yes, this version has been refereed | ||||||
| Created at the University of Regensburg: | Yes | ||||||
| Item ID: | 58884 |
Abstract
Transforming growth factor beta (TGF-beta) is cytostatic towards damage-induced compensatory hepatocyte proliferation. This function is frequently lost during hepatocarcinogenesis, thereby switching the TGF-beta role from tumour suppressor to tumour promoter. In the present study, we investigate Smad7 overexpression as a pathophysiological mechanism for cytostatic TGF-beta inhibition in liver ...

Abstract
Transforming growth factor beta (TGF-beta) is cytostatic towards damage-induced compensatory hepatocyte proliferation. This function is frequently lost during hepatocarcinogenesis, thereby switching the TGF-beta role from tumour suppressor to tumour promoter. In the present study, we investigate Smad7 overexpression as a pathophysiological mechanism for cytostatic TGF-beta inhibition in liver damage and hepatocellular carcinoma (HCC). Transgenic hepatocyte-specific Smad7 overexpression in damaged liver of fumarylacetoacetate hydrolase (FAH)-deficient mice increased compensatory proliferation of hepatocytes. Similarly, modulation of Smad7 expression changed the sensitivity of Huh7, FLC-4, HLE and HLF HCC cell lines for cytostatic TGF-beta effects. In our cohort of 140 HCC patients, Smad7 transcripts were elevated in 41.4% of HCC samples as compared with adjacent tissue, with significant positive correlation to tumour size, whereas low Smad7 expression levels were significantly associated with worse clinical outcome. Univariate and multivariate analyses indicate Smad7 levels as an independent predictor for overall (P < 0.001) and disease-free survival (P = 0.0123). Delineating a mechanism for Smad7 transcriptional regulation in HCC, we identified cold-shock Y-box protein-1 (YB-1), a multifunctional transcription factor. YB-1 RNAi reduced TGF-beta-induced and endogenous Smad7 expression in Huh7 and FLC-4 cells respectively. YB-1 and Smad7 mRNA expression levels correlated positively (P < 0.0001). Furthermore, nuclear co-localization of Smad7 and YB-1 proteins was present in cancer cells of those patients. In summary, the present study provides a YB-1/Smad7-mediated mechanism that interferes with anti-proliferative/tumour-suppressive TGF-beta actions in a subgroup of HCC cells that may facilitate aspects of tumour progression.
Metadata last modified: 21 Aug 2024 09:51
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