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2016 ; 15
(1
): 49
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Efficient elimination of pancreatic cancer stem cells by hedgehog/GLI inhibitor
GANT61 in combination with mTOR inhibition
#MMPMID27349387
Miyazaki Y
; Matsubara S
; Ding Q
; Tsukasa K
; Yoshimitsu M
; Kosai K
; Takao S
Mol Cancer
2016[Jun]; 15
(1
): 49
PMID27349387
show ga
BACKGROUND: Pancreatic cancer is one of the most lethal malignancies. The
innovative treatments are required and now the cancer stem cells (CSCs) are
expected to be an effective target for novel therapies. Therefore we investigated
the significance of hedgehog (Hh) signaling in the maintenance of CSC-like
properties of pancreatic cancer cells, in order to discover the key molecules
controlling their unique properties. METHODS: Human pancreatic cancer cell lines,
Capan-1, PANC-1, MIA PaCa-2 and Capan-1 M9 were used for our experiments in
DMEM/F12 medium containing 10 % fetal bovine serum. Sphere formation assay,
immunofluorescence staining, flow cytometric analysis and MTT cell viability
assay were performed to investigate molecular signals and the efficacy in the
treatment of pancreatic cancer cells. RESULTS: Inhibition of the Hh pathway
significantly reduced the expression of stem cell marker CD133 and sphere
formation, an index of self-renewal capacity, demonstrating the suppression of
CSC-like properties. Moreover, the GLI inhibitor GANT61 induced greater reduction
in sphere formation and cell viability of pancreatic cancer cells than the
smoothened (SMO) inhibitor cyclopamine. This suggests that GLI transcription
factors, but not SMO membrane protein, are the key molecules in the Hh pathway.
The treatment using GANT61 in combination with the inhibition of mTOR, which is
another key molecule in pancreatic CSCs, resulted in the efficient reduction of
cell viability and sphere formation of an inhibitor-resistant cell line, showing
the strong efficacy and wide range applicability to pancreatic CSC-like cells.
CONCLUSIONS: Thus, this novel combination treatment could be useful for the
control of pancreatic cancer by targeting pancreatic CSCs. This is the first
report of the efficient elimination of pancreatic cancer stem-like cells by the
double blockage of Hh/GLI and mTOR signaling.