The Hippo pathway effector TAZ induces intrahepatic cholangiocarcinoma in mice and is ubiquitously activated in the human disease.
Adaptor Proteins, Signal Transducing
/ genetics
Animals
Bile Duct Neoplasms
/ genetics
Bile Ducts, Intrahepatic
/ metabolism
Carcinoma, Hepatocellular
/ pathology
Cholangiocarcinoma
/ pathology
Hippo Signaling Pathway
Humans
Mice
Protein Serine-Threonine Kinases
/ genetics
Proto-Oncogene Proteins c-akt
/ metabolism
Signal Transduction
YAP-Signaling Proteins
AKT
Hippo pathway
Intrahepatic cholangiocarcinoma
Notch
TAZ
TEAD transcription factors
Journal
Journal of experimental & clinical cancer research : CR
ISSN: 1756-9966
Titre abrégé: J Exp Clin Cancer Res
Pays: England
ID NLM: 8308647
Informations de publication
Date de publication:
03 Jun 2022
03 Jun 2022
Historique:
received:
05
03
2022
accepted:
16
05
2022
entrez:
2
6
2022
pubmed:
3
6
2022
medline:
7
6
2022
Statut:
epublish
Résumé
Intrahepatic cholangiocarcinoma (iCCA) is a highly aggressive primary liver tumor with increasing incidence worldwide, dismal prognosis, and few therapeutic options. Mounting evidence underlines the role of the Hippo pathway in this disease; however, the molecular mechanisms whereby the Hippo cascade contributes to cholangiocarcinogenesis remain poorly defined. We established novel iCCA mouse models via hydrodynamic transfection of an activated form of transcriptional coactivator with PDZ-binding motif (TAZ), a Hippo pathway downstream effector, either alone or combined with the myristoylated AKT (myr-AKT) protooncogene, in the mouse liver. Hematoxylin and eosin staining, immunohistochemistry, electron microscopy, and quantitative real-time RT-PCR were applied to characterize the models. In addition, in vitro cell line studies were conducted to address the growth-promoting roles of TAZ and its paralog YAP. Overexpression of TAZ in the mouse liver triggered iCCA development with very low incidence and long latency. In contrast, co-expression of TAZ and myr-AKT dramatically increased tumor frequency and accelerated cancer formation in mice, with 100% iCCA incidence and high tumor burden by 10 weeks post hydrodynamic injection. AKT/TAZ tumors faithfully recapitulated many of the histomolecular features of human iCCA. At the molecular level, the development of the cholangiocellular lesions depended on the binding of TAZ to TEAD transcription factors. In addition, inhibition of the Notch pathway did not hamper carcinogenesis but suppressed the cholangiocellular phenotype of AKT/TAZ tumors. Also, knockdown of YAP, the TAZ paralog, delayed cholangiocarcinogenesis in AKT/TAZ mice without affecting the tumor phenotype. Furthermore, human preinvasive and invasive iCCAs and mixed hepatocellular carcinoma/iCCA displayed widespread TAZ activation and downregulation of the mechanisms protecting TAZ from proteolysis. Overall, the present data underscore the crucial role of TAZ in cholangiocarcinogenesis.
Sections du résumé
BACKGROUND
BACKGROUND
Intrahepatic cholangiocarcinoma (iCCA) is a highly aggressive primary liver tumor with increasing incidence worldwide, dismal prognosis, and few therapeutic options. Mounting evidence underlines the role of the Hippo pathway in this disease; however, the molecular mechanisms whereby the Hippo cascade contributes to cholangiocarcinogenesis remain poorly defined.
METHODS
METHODS
We established novel iCCA mouse models via hydrodynamic transfection of an activated form of transcriptional coactivator with PDZ-binding motif (TAZ), a Hippo pathway downstream effector, either alone or combined with the myristoylated AKT (myr-AKT) protooncogene, in the mouse liver. Hematoxylin and eosin staining, immunohistochemistry, electron microscopy, and quantitative real-time RT-PCR were applied to characterize the models. In addition, in vitro cell line studies were conducted to address the growth-promoting roles of TAZ and its paralog YAP.
RESULTS
RESULTS
Overexpression of TAZ in the mouse liver triggered iCCA development with very low incidence and long latency. In contrast, co-expression of TAZ and myr-AKT dramatically increased tumor frequency and accelerated cancer formation in mice, with 100% iCCA incidence and high tumor burden by 10 weeks post hydrodynamic injection. AKT/TAZ tumors faithfully recapitulated many of the histomolecular features of human iCCA. At the molecular level, the development of the cholangiocellular lesions depended on the binding of TAZ to TEAD transcription factors. In addition, inhibition of the Notch pathway did not hamper carcinogenesis but suppressed the cholangiocellular phenotype of AKT/TAZ tumors. Also, knockdown of YAP, the TAZ paralog, delayed cholangiocarcinogenesis in AKT/TAZ mice without affecting the tumor phenotype. Furthermore, human preinvasive and invasive iCCAs and mixed hepatocellular carcinoma/iCCA displayed widespread TAZ activation and downregulation of the mechanisms protecting TAZ from proteolysis.
CONCLUSIONS
CONCLUSIONS
Overall, the present data underscore the crucial role of TAZ in cholangiocarcinogenesis.
Identifiants
pubmed: 35655220
doi: 10.1186/s13046-022-02394-2
pii: 10.1186/s13046-022-02394-2
pmc: PMC9164528
doi:
Substances chimiques
Adaptor Proteins, Signal Transducing
0
YAP-Signaling Proteins
0
Protein Serine-Threonine Kinases
EC 2.7.11.1
Proto-Oncogene Proteins c-akt
EC 2.7.11.1
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
192Subventions
Organisme : NIDDK NIH HHS
ID : P30 DK026743
Pays : United States
Organisme : NIH HHS
ID : R01CA190606
Pays : United States
Organisme : NCI NIH HHS
ID : R01 CA190606
Pays : United States
Commentaires et corrections
Type : ErratumIn
Informations de copyright
© 2022. The Author(s).
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