Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Role of PINCH and Its Partner Tumor Suppressor Rsu-1 in Regulating Liver Size and Tumorigenesis

Donthamsetty, S and Bhave, VS and Mars, WM and Bowen, WC and Orr, A and Haynes, MM and Wu, C and Michalopoulos, GK (2013) Role of PINCH and Its Partner Tumor Suppressor Rsu-1 in Regulating Liver Size and Tumorigenesis. PLoS ONE, 8 (9).

[img]
Preview
PDF
Available under License : See the attached license file.

Download (3MB) | Preview
[img] Plain Text (licence)
Available under License : See the attached license file.

Download (1kB)

Abstract

Particularly interesting new cysteine-histidine-rich protein (PINCH) protein is part of the ternary complex known as the IPP (integrin linked kinase (ILK)-PINCH-Parvin-α) complex. PINCH itself binds to ILK and to another protein known as Rsu-1 (Ras suppressor 1). We generated PINCH 1 and PINCH 2 Double knockout mice (referred as PINCH DKO mice). PINCH2 elimination was systemic whereas PINCH1 elimination was targeted to hepatocytes. The genetically modified mice were born normal. The mice were sacrificed at different ages after birth. Soon after birth, they developed abnormal hepatic histology characterized by disorderly hepatic plates, increased proliferation of hepatocytes and biliary cells and increased deposition of extracellular matrix. After a sustained and prolonged proliferation of all epithelial components, proliferation subsided and final liver weight by the end of 30 weeks in livers with PINCH DKO deficient hepatocytes was 40% larger than the control mice. The livers of the PINCH DKO mice were also very stiff due to increased ECM deposition throughout the liver, with no observed nodularity. Mice developed liver cancer by one year. These mice regenerated normally when subjected to 70% partial hepatectomy and did not show any termination defect. Ras suppressor 1 (Rsu-1) protein, the binding partner of PINCH is frequently deleted in human liver cancers. Rsu-1 expression is dramatically decreased in PINCH DKO mouse livers. Increased expression of Rsu-1 suppressed cell proliferation and migration in HCC cell lines. These changes were brought about not by affecting activation of Ras (as its name suggests) but by suppression of Ras downstream signaling via RhoGTPase proteins. In conclusion, our studies suggest that removal of PINCH results in enlargement of liver and tumorigenesis. Decreased levels of Rsu-1, a partner for PINCH and a protein often deleted in human liver cancer, may play an important role in the development of the observed phenotype. © 2013 Donthamsetty et al.


Share

Citation/Export:
Social Networking:
Share |

Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Donthamsetty, S
Bhave, VS
Mars, WMwmars@pitt.eduWMARS
Bowen, WCbowen@pitt.eduBOWEN
Orr, Aavo4@pitt.eduAVO4
Haynes, MMmmh51@pitt.eduMMH51
Wu, Ccarywu@pitt.eduCARYWU
Michalopoulos, GKmichal@pitt.eduMICHAL
Date: 18 September 2013
Date Type: Publication
Journal or Publication Title: PLoS ONE
Volume: 8
Number: 9
DOI or Unique Handle: 10.1371/journal.pone.0074625
Schools and Programs: School of Medicine > Pathology
Refereed: Yes
Date Deposited: 11 Oct 2013 19:14
Last Modified: 02 Feb 2019 16:56
URI: http://d-scholarship.pitt.edu/id/eprint/19826

Metrics

Monthly Views for the past 3 years

Plum Analytics

Altmetric.com


Actions (login required)

View Item View Item