A cell-autonomous tumour suppressor role of RAF1 in hepatocarcinogenesis.

Abstract:

:Hepatocellular carcinoma (HCC) is a leading cause of cancer deaths, but its molecular heterogeneity hampers the design of targeted therapies. Currently, the only therapeutic option for advanced HCC is Sorafenib, an inhibitor whose targets include RAF. Unexpectedly, RAF1 expression is reduced in human HCC samples. Modelling RAF1 downregulation by RNAi increases the proliferation of human HCC lines in xenografts and in culture; furthermore, RAF1 ablation promotes chemical hepatocarcinogenesis and the proliferation of cultured (pre)malignant mouse hepatocytes. The phenotypes depend on increased YAP1 expression and STAT3 activation, observed in cultured RAF1-deficient cells, in HCC xenografts, and in autochthonous liver tumours. Thus RAF1, although essential for the development of skin and lung tumours, is a negative regulator of hepatocarcinogenesis. This unexpected finding highlights the contribution of the cellular/tissue environment in determining the function of a protein, and underscores the importance of understanding the molecular context of a disease to inform therapy design.

journal_name

Nat Commun

journal_title

Nature communications

authors

Jeric I,Maurer G,Cavallo AL,Raguz J,Desideri E,Tarkowski B,Parrini M,Fischer I,Zatloukal K,Baccarini M

doi

10.1038/ncomms13781

subject

Has Abstract

pub_date

2016-12-21 00:00:00

pages

13781

issn

2041-1723

pii

ncomms13781

journal_volume

7

pub_type

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