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2018 ; 9
(6
): 598
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English Wikipedia
Hirsutine induces mPTP-dependent apoptosis through ROCK1/PTEN/PI3K/GSK3? pathway
in human lung cancer cells
#MMPMID29789524
Zhang R
; Li G
; Zhang Q
; Tang Q
; Huang J
; Hu C
; Liu Y
; Wang Q
; Liu W
; Gao N
; Zhou S
Cell Death Dis
2018[May]; 9
(6
): 598
PMID29789524
show ga
Hirsutine extracted from Uncaria rhynchophylla has been shown to exhibit
anti-cancer activity. However, the molecular mechanism by which hirsutine
exhibits anti-lung cancer activity remains unclear. In the present study, we
showed that hirsutine induces apoptosis in human lung cancer cells via loss of
mitochondrial membrane potential (??m), adenosine triphosphate (ATP) depletion,
ROS production, as well as cytochrome c release. Dephosphorylation of GSK3? is
involved in hirsutine-mediated mitochondrial permeability transition pore (mPTP)
opening through ANT1/CypD interaction. Mechanistic study revealed that
interruption of ROCK1/PTEN/PI3K/Akt signaling pathway plays a critical role in
hirsutine-mediated GSK3? dephosphorylation and mitochondrial apoptosis. Our in
vivo study also showed that hirsutine effectively inhibits tumor growth in a A549
xenograft mouse model through ROCK1/PTEN/PI3K/Akt signaling-mediated GSK3?
dephosphorylation and apoptosis. Collectively, these findings suggest a
hierarchical model in which induction of apoptosis by hirsutine stems primarily
from activation of ROCK1 and PTEN, inactivation of PI3K/Akt, leading in turn to
GSK3? dephosphorylation and mPTP opening, and culminating in caspase-3 activation
and apoptosis. These findings could provide a novel mechanistic basis for the
application of hirsutine in the treatment of human lung cancer.