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2016 ; 6
(ä): 30238
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YAP Subcellular Localization and Hippo Pathway Transcriptome Analysis in
Pediatric Hepatocellular Carcinoma
#MMPMID27605415
LaQuaglia MJ
; Grijalva JL
; Mueller KA
; Perez-Atayde AR
; Kim HB
; Sadri-Vakili G
; Vakili K
Sci Rep
2016[Sep]; 6
(ä): 30238
PMID27605415
show ga
Pediatric hepatocellular carcinoma (HCC) is a rare tumor which is associated with
an extremely high mortality rate due to lack of effective chemotherapy. Recently,
the Hippo pathway and its transcriptional co-activator Yes-associated protein
(YAP) have been shown to play a role in hepatocyte proliferation and development
of HCC in animal models. Therefore, we sought to examine the activity of YAP and
the expression of Hippo pathway components in tumor and non-neoplastic liver
tissue from 7 pediatric patients with moderately differentiated HCC. None of the
patients had underlying cirrhosis or viral hepatitis, which is commonly seen in
adults with HCC. This highlights a major difference in the pathogenesis of HCC
between children and adults. We found a statistically significant increase in YAP
nuclear localization in 100% of tumors. YAP target gene (CCNE1, CTGF, Cyr61) mRNA
expression was also increased in the tumors that had the most significant
increase in YAP nuclear localization. Based on Ki67 co-localization studies YAP
nuclear localization was not simply a marker of proliferation. Our results
demonstrate a clear increase in YAP activity in moderately differentiated
pediatric HCC, providing evidence that it may play an important role in tumor
survival and propagation.
|*Gene Expression Regulation, Neoplastic
[MESH]
|*Transcriptome
[MESH]
|Adaptor Proteins, Signal Transducing/*genetics/metabolism
[MESH]