TY - JOUR
T1 - Notch signaling inhibits hepatocellular carcinoma following inactivation of the RB pathway
AU - Viatour, Patrick
AU - Ehmer, Ursula
AU - Saddic, Louis A.
AU - Dorrell, Craig
AU - Andersen, Jesper B.
AU - Lin, Chenwei
AU - Zmoos, Anne Flore
AU - Mazur, Pawel K.
AU - Schaffer, Bethany E.
AU - Ostermeier, Austin
AU - Vogel, Hannes
AU - Sylvester, Karl G.
AU - Thorgeirsson, Snorri S.
AU - Grompe, Markus
AU - Sage, Julien
PY - 2011/9/26
Y1 - 2011/9/26
N2 - Hepatocellular carcinoma (HCC) is the third cancer killer worldwide with >600,000 deaths every year. Although the major risk factors are known, therapeutic options in patients remain limited in part because of our incomplete understanding of the cellular and molecular mechanisms influencing HCC development. Evidence indicates that the retinoblastoma (RB) pathway is functionally inactivated in most cases of HCC by genetic, epigenetic, and/or viral mechanisms. To investigate the functional relevance of this observation, we inactivated the RB pathway in the liver of adult mice by deleting the three members of the Rb (Rb1) gene family: Rb, p107, and p130. Rb family triple knockout mice develop liver tumors with histopathological features and gene expression profiles similar to human HCC. In this mouse model, cancer initiation is associated with the specific expansion of populations of liver stem/ progenitor cells, indicating that the RB pathway may prevent HCC development by maintaining the quiescence of adult liver progenitor cells. In addition, we show that during tumor progression, activation of the Notch pathway via E2F transcription factors serves as a negative feedback mechanism to slow HCC growth. The level of Notch activity is also able to predict survival of HCC patients, suggesting novel means to diagnose and treat HCC.
AB - Hepatocellular carcinoma (HCC) is the third cancer killer worldwide with >600,000 deaths every year. Although the major risk factors are known, therapeutic options in patients remain limited in part because of our incomplete understanding of the cellular and molecular mechanisms influencing HCC development. Evidence indicates that the retinoblastoma (RB) pathway is functionally inactivated in most cases of HCC by genetic, epigenetic, and/or viral mechanisms. To investigate the functional relevance of this observation, we inactivated the RB pathway in the liver of adult mice by deleting the three members of the Rb (Rb1) gene family: Rb, p107, and p130. Rb family triple knockout mice develop liver tumors with histopathological features and gene expression profiles similar to human HCC. In this mouse model, cancer initiation is associated with the specific expansion of populations of liver stem/ progenitor cells, indicating that the RB pathway may prevent HCC development by maintaining the quiescence of adult liver progenitor cells. In addition, we show that during tumor progression, activation of the Notch pathway via E2F transcription factors serves as a negative feedback mechanism to slow HCC growth. The level of Notch activity is also able to predict survival of HCC patients, suggesting novel means to diagnose and treat HCC.
UR - http://www.scopus.com/inward/record.url?scp=80555154065&partnerID=8YFLogxK
U2 - 10.1084/jem.20110198
DO - 10.1084/jem.20110198
M3 - Article
C2 - 21875955
AN - SCOPUS:80555154065
SN - 0022-1007
VL - 208
SP - 1963
EP - 1976
JO - Journal of Experimental Medicine
JF - Journal of Experimental Medicine
IS - 10
ER -