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2016 ; 11
(4
): 2934-2940
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Hinokitiol inhibits vasculogenic mimicry activity of breast cancer
stem/progenitor cells through proteasome-mediated degradation of epidermal growth
factor receptor
#MMPMID27073579
Tu DG
; Yu Y
; Lee CH
; Kuo YL
; Lu YC
; Tu CW
; Chang WW
Oncol Lett
2016[Apr]; 11
(4
): 2934-2940
PMID27073579
show ga
Hinokitiol, alternatively known as ?-thujaplicin, is a tropolone-associated
natural compound with antimicrobial, anti-inflammatory and antitumor activity.
Breast cancer stem/progenitor cells (BCSCs) are a subpopulation of breast cancer
cells associated with tumor initiation, chemoresistance and metastatic behavior,
and may be enriched by mammosphere cultivation. Previous studies have
demonstrated that BCSCs exhibit vasculogenic mimicry (VM) activity via the
epidermal growth factor receptor (EGFR) signaling pathway. The present study
investigated the anti-VM activity of hinokitiol in BCSCs. At a concentration
below the half maximal inhibitory concentration, hinokitiol inhibited VM
formation of mammosphere cells derived from two human breast cancer cell lines.
Hinokitiol was additionally indicated to downregulate EGFR protein expression in
mammosphere-forming BCSCs without affecting the expression of messenger RNA. The
protein stability of EGFR in BCSCs was also decreased by hinokitiol. The EGFR
protein expression and VM formation capability of hinokitiol-treated BCSCs were
restored by co-treatment with MG132, a proteasome inhibitor. In conclusion, the
present study indicated that hinokitiol may inhibit the VM activity of BCSCs
through stimulating proteasome-mediated EGFR degradation. Hinokitiol may act as
an anti-VM agent, and may be useful for the development of novel breast cancer
therapeutic agents.