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Series GSE25583 Query DataSets for GSE25583
Status Public on Nov 09, 2011
Title Loss of c-Met Accelerates Development of Liver Fibrosis in Response to CCl4 Exposure through Deregulation of Multiple Molecular Pathways
Organism Mus musculus
Experiment type Expression profiling by array
Summary Background:
HGF/c-Met signaling plays a pivotal role in hepatocyte survival and tissue remodeling during liver regeneration. Treatment with HGF has been shown to accelerate resolution of fibrotic liver lesions in experimental animal models. To formally address the importance of c-Met signaling in hepatocytes in the context of chronic liver injury, we have used hepatocyte-specific Metfl/fl;Alb-Cre+/- conditional knockout mice (KO) and a model of liver fibrosis.

Methods:
CCl4 was administrated biweekly over a period of 4 weeks (injury phase), and the animals were followed over the next 4 weeks (healing phase). Macroscopic and microscopic changes during the injury and healing phases were monitored by IHC. Deposition of ECM was assessed by Sirius red staining and hydroxiproline content. Activation of hepatic stellate cells (HSC) was estimated by a-SMA using WB and IHC. Expression levels of the selected key fibrotic molecules were evaluated by RT-qPCR and WB. Time-dependent global transcriptomic changes from whole livers and isolated hepatocytes were examined using gene expression microarrays.

Results:
Loss of HGF/c-Met signaling in hepatocytes altered the hepatic microenvironment and dramatically aggravated hepatic fibrogenesis. Increased liver damage was associated with decreased hepatocyte proliferation, progressive accumulation of HSCs, and delayed fibrinolysis causing increased collagen deposit. Dystrophic calcification of necrotic areas impaired phagocytosis, resulting in sustained inflammatory and fibrogenic signaling further augmenting severity of fibrogenesis. Global gene-expression analysis demonstrated upregulation of key fibrogenic molecules, such as Tgf-â and Pdgf-â, paralleled by a decreased expression of genes important for cell cycle, stress response and regeneration, which could be attributed to the c-Met deficiency in hepatocytes. Additionally, key chemotactic and inflammatory cytokines, including Ccl2, SDF1/Cxcr4 and Spp1, were upregulated in Metfl/fl;Alb-Cre+/- hepatocytes. However, the major pro-fibrotic signaling originated from the non-parenchymal cell compartments, as revealed by cell type-specific gene expression signatures.

Conclusion:
These results indicate that lack of c-Met signaling in hepatocytes disrupts the balance between extracellular matrix production and degradation and establish a protective role for c-Met against adverse microenvironment leading to the development of fibrotic liver disease.
 
Overall design In the present study, we reported a detailed and comprehensive dynamic characterization of the cellular and molecular alterations involved in fibrosis in the liver of c-Met transgenic mice. Liver samples from female animals were collected at various time-points after fibrosis induction using CCL4 ranging from 0 weeks to 3 weeks. Tissue samples were divided into two parts; one was fixed in 10% formalin for histological evaluation and the other was used for RNA analysis.
 
Contributor(s) Marquardt JU, Seo D, Thorgeirsson SS
Citation(s) 20862286, 22386877
Submission date Nov 23, 2010
Last update date Jun 14, 2018
Contact name Daekwan Seo
E-mail(s) daekwan_seo@nih.gov
Phone 301-496-5688
Fax 301-496-0734
Organization name NIH
Department NCI
Lab LEC
Street address 37 Convent Dr. Rm 4140
City Bethesda
State/province MD
ZIP/Postal code 20878
Country USA
 
Platforms (1)
GPL6885 Illumina MouseRef-8 v2.0 expression beadchip
Samples (40)
GSM628943 WT_0w-1
GSM628944 WT_0w-2
GSM628945 WT_0w-3
Relations
BioProject PRJNA133895

Download family Format
SOFT formatted family file(s) SOFTHelp
MINiML formatted family file(s) MINiMLHelp
Series Matrix File(s) TXTHelp

Supplementary file Size Download File type/resource
GSE25583_RAW.tar 3.1 Mb (http)(custom) TAR
GSE25583_non-normalized.txt.gz 7.2 Mb (ftp)(http) TXT
Raw data are available on Series record
Processed data included within Sample table

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