期刊
GENE
卷 423, 期 1, 页码 23-28出版社
ELSEVIER
DOI: 10.1016/j.gene.2008.05.022
关键词
Liver; Mouse model; TGF-beta 1; Platelet derived growth factor; CRP promoter
资金
- Deutsche Forschungsgemeinschaft [KA7353/ 1-1, 1-2]
Platelet derived growth factor (PDGF) plays a central role in repair mechanisms after acute and chronic tissue damage. To further evaluate the role of PDGF-A in liver fibrogenesis in vivo, we generated transgenic mice with hepatocyte-specific overexpression of PDGF-A using the CRP-gene promoter. Transgenic but not wildtype mice showed expression of PDGF-A mRNA in the liver. Hepatic PDGF-A overexpression was accompanied by a significant increase in hepatic procollagen III mRNA expression as well as TGF-beta 1 expression. Liver histology showed increased deposition of extracellular matrix in transgenic but not in wildtype mice. PDGF-A-transgenic mice showed positive sinusoidal staining for alpha-SMA indicating an activation of hepatic stellate cells. Since the profibrogenic effect of PDGF-A was accompanied by increased TGF-beta 1 protein concentration in the liver of transgenic mice, it can be postulated that PDGF-A upregulates expression of TGF-beta 1 which is a strong activator of hepatic stellate cells. Thus, these results point towards a fibrosis induction by PDGF-A via the TGF-beta 1 signalling pathway. In conclusion, expression and functional analysis of PDGF-A in the liver of transgenic mice suggest a relevant profibrogenic role of PDGF-A via TGF-beta 1 induction. Counteracting PDGF-A may therefore be one of the effects of tyrosine kinase inhibitors which showed protective effects in animal models of liver fibrosis. (C) 2008 Elsevier B.V. All rights reserved.
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