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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Cancer+Res
2016 ; 6
(1
): 27-37
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Verteporfin inhibits YAP function through up-regulating 14-3-3? sequestering YAP
in the cytoplasm
#MMPMID27073720
Wang C
; Zhu X
; Feng W
; Yu Y
; Jeong K
; Guo W
; Lu Y
; Mills GB
Am J Cancer Res
2016[]; 6
(1
): 27-37
PMID27073720
show ga
Yes-associated protein (YAP), the central mediator of Hippo pathway, not only
regulates a diversity of cellular processes during development but also plays a
pivotal role in tumorigenesis. YAP is overexpressed in many types of human
cancers with its expression level being associated with patient outcomes. Thus,
inhibiting YAP function could provide a novel therapeutic approach. Verteporfin,
a photosensitizer, which has been used in photodynamic therapy (PDT), was
recently identified as an inhibitor of the interaction of YAP with TEAD, which,
in turn, blocks transcriptional activation of targets downstream of YAP. However,
the mechanism by which Verteporfin inhibits YAP activity remains to be
elucidated. We demonstrate that overexpression of YAP stimulates cell
proliferation whereas knocking down YAP or treating cells with Verteporfin
inhibited cell proliferation, even in the presence of growth factors.
Protoporphyrin IX, another photosensitizer, did not have similar activity
demonstrating specificity to Verteporfin. Verteporfin induced sequestration of
YAP in cytoplasm through increasing levels of 14-3-3?, a YAP chaperon protein
that retains YAP in cytoplasm and targets it for degradation in the proteosome.
Interestingly, while knockdown of YAP had no effect on the ability of Verteporfin
to induce 14-3-3?, p53 is required for this effect of Verteporfin. This provides
potential approaches to select patients likely to benefit from Verteporfin.