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2017 ; 17
(4
): 313-326
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Increased YAP Activation Is Associated With Hepatic Cyst Epithelial Cell
Proliferation in ARPKD/CHF
#MMPMID28915934
Jiang L
; Sun L
; Edwards G
; Manley M Jr
; Wallace DP
; Septer S
; Manohar C
; Pritchard MT
; Apte U
Gene Expr
2017[Nov]; 17
(4
): 313-326
PMID28915934
show ga
Autosomal recessive polycystic kidney disease/congenital hepatic fibrosis
(ARPKD/CHF) is a rare but fatal genetic disease characterized by progressive cyst
development in the kidneys and liver. Liver cysts arise from aberrantly
proliferative cholangiocytes accompanied by pericystic fibrosis and inflammation.
Yes-associated protein (YAP), the downstream effector of the Hippo signaling
pathway, is implicated in human hepatic malignancies such as hepatocellular
carcinoma, cholangiocarcinoma, and hepatoblastoma, but its role in hepatic
cystogenesis in ARPKD/CHF is unknown. We studied the role of the YAP in hepatic
cyst development using polycystic kidney (PCK) rats, an orthologous model of
ARPKD, and in human ARPKD/CHF patients. The liver cyst wall epithelial cells
(CWECs) in PCK rats were highly proliferative and exhibited expression of YAP.
There was increased expression of YAP target genes, Ccnd1 (cyclin D1) and Ctgf
(connective tissue growth factor), in PCK rat livers. Extensive expression of YAP
and its target genes was also detected in human ARPKD/CHF liver samples. Finally,
pharmacological inhibition of YAP activity with verteporfin and short hairpin
(sh) RNA-mediated knockdown of YAP expression in isolated liver CWECs
significantly reduced their proliferation. These data indicate that increased YAP
activity, possibly through dysregulation of the Hippo signaling pathway, is
associated with hepatic cyst growth in ARPKD/CHF.