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2015 ; 6
(33
): 34788-99
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PAR1 participates in the ability of multidrug resistance and tumorigenesis by
controlling Hippo-YAP pathway
#MMPMID26431277
Fujimoto D
; Ueda Y
; Hirono Y
; Goi T
; Yamaguchi A
Oncotarget
2015[Oct]; 6
(33
): 34788-99
PMID26431277
show ga
The Hippo pathway significantly correlates with organ size control and
tumorigenesis. The activity of YAP/TAZ, a transducer of the Hippo pathway, is
required to sustain self-renewal and tumor-initiation capacities in cancer stem
cells (CSCs). But, upstream signals that control the mammalian Hippo pathway have
not been well understood. Here, we reveal a connection between the
Protease-activated receptor 1 (PAR1) signaling pathway and the Hippo-YAP pathway
in gastric cancer stem-like cells. The selective PAR1 agonist TFLLR-NH2 induces
an increase in the fraction of side population cells which is enriched in CSCs,
and promotes tumorigenesis, multi cancer drug resistance, cell morphological
change, and cell invasion which are characteristics of CSCs. In addition, PAR1
activation inhibits the Hippo-YAP pathway kinase Lats via Rho GTPase. Lats kinase
inhibition in turn results in increased nuclear localization of dephosphorylated
YAP. Furthermore, PAR1 activation confers CSCs related traits via the Hippo-YAP
pathway, and the Hippo-YAP pathway correlates with epithelial mesenchymal
transition which is induced by PAR1 activation. Our research suggests that the
PAR1 signaling deeply participates in the ability of multi drug resistance and
tumorigenesis through interactions with the Hippo-YAP pathway signaling in
gastric cancer stem-like cells. We presume that inhibited YAP is a new
therapeutic target in the treatment human gastric cancer invasion and metastasis
by dysregulated PAR1 or its agonists.
|Adaptor Proteins, Signal Transducing/*metabolism
[MESH]