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2018 ; 9
(6
): 591
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YAP-dependent ubiquitination and degradation of ?-catenin mediates inhibition of
Wnt signalling induced by Physalin F in colorectal cancer
#MMPMID29789528
Chen C
; Zhu D
; Zhang H
; Han C
; Xue G
; Zhu T
; Luo J
; Kong L
Cell Death Dis
2018[May]; 9
(6
): 591
PMID29789528
show ga
Aberrant activation of Wnt/?-catenin signalling is critical in the progression of
human cancers, especially colorectal cancer (CRC). Therefore, inhibition of
Wnt/?-catenin signalling is a significant potential target for CRC therapy. Here,
we identified for the first time that Physalin F (PF), a steroid derivative
isolated from Physalis angulate, acts as an antagonist of Wnt/?-catenin
signalling. In vitro, PF decreased Wnt3a-induced TOPFlash reporter activity in
HEK293T cells and promoted the formation of the ?-catenin destruction complex.
Importantly, PF also inhibited Wnt/?-catenin signalling and accelerated the
degradation of ?-catenin in CRC cells. However, PF did not affect the
stabilization of Axin or the interaction of ?-catenin with E-cadherin.
Interestingly, we further found that PF promoted YAP binding to the ?-catenin
destruction complex, which facilitated the ubiquitination and degradation of
?-catenin. Silencing and pharmacological inhibition of YAP reversed the formation
of the ?-catenin destruction complex induced by PF, implying that YAP binding to
the ?-catenin destruction complex was responsible for PF-mediated inhibition of
Wnt/?-catenin signalling. Furthermore, PF observably inhibited tumour growth by
down-regulating ?-catenin in tumour-bearing mice. Collectively, our findings
indicated that PF inhibited Wnt/?-catenin signalling by accelerating the
ubiquitination and degradation of ?-catenin in a YAP-dependent manner and
therefore PF could be a novel potential candidate for CRC therapy.
|*Ubiquitination
[MESH]
|Adaptor Proteins, Signal Transducing/*metabolism
[MESH]