TGF-beta inactivation and TGF-alpha overexpression cooperate in an in vivo mouse model to induce hepatocellular carcinoma that recapitulates molecular features of human liver cancer.

Abstract:

:Hepatocellular carcinoma (HCC) results from the cumulative effects of deregulated tumor suppressor genes and oncogenes. The tumor suppressor and oncogenes commonly affected include growth factors, receptors and their downstream signaling pathway components. The overexpression of transforming growth factor alpha (TGF-alpha) and the inhibition of TGF-beta signaling are especially common in human liver cancer. Thus, we assessed whether TGF-alpha overexpression and TGF-beta signaling inactivation cooperate in hepatocarcinogenesis using an in vivo mouse model, MT1/TGFa;AlbCre/Tgfbr2(flx/flx) mice ("TGFa;Tgfbr2(hepko)"), which overexpresses TGF-alpha and lacks a TGF-beta receptor in the liver. TGF-beta signaling inactivation did not alter the frequency or number of cancers in mice with overexpression of TGF-alpha. However, the tumors in the TGFa;Tgfbr2(hepko) mice displayed increased proliferation and increased cdk2, cyclin E and cyclin A expression as well as decreased Cdkn1a/p21 expression compared to normal liver and compared to the cancers arising in the TGF-alpha overexpressing mice with intact TGF-beta receptors. Increased phosphorylated ERK1/2 expression was also present in the tumors from the TGFa;Tgfbr2(hepko) mice and correlated with downregulated Raf kinase inhibitor protein expression, which is a common molecular event in human HCC. Thus, TGF-beta signaling inactivation appears to cooperate with TGF-alpha in vivo to promote the formation of liver cancer that recapitulates molecular features of human HCC.

journal_name

Int J Cancer

authors

Baek JY,Morris SM,Campbell J,Fausto N,Yeh MM,Grady WM

doi

10.1002/ijc.25127

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

1060-71

issue

5

eissn

0020-7136

issn

1097-0215

journal_volume

127

pub_type

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