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2017 ; 37
(4
): 1971-1979
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Cancer-associated fibroblasts enhance pancreatic cancer cell invasion by
remodeling the metabolic conversion mechanism
#MMPMID28260082
Shan T
; Chen S
; Chen X
; Lin WR
; Li W
; Ma J
; Wu T
; Cui X
; Ji H
; Li Y
; Kang Y
Oncol Rep
2017[Apr]; 37
(4
): 1971-1979
PMID28260082
show ga
We investigated the mechanism of cancer-associated fibroblasts (CAFs) in
promoting the invasion and metastasis of pancreatic cancer cells in a
non-vascular manner. We verified the original generation of isolated cultured
CAFs and normal fibroblasts (NFs) based on the expression of ?-SMA and vimentin,
and we examined the cell glycolysis level through glucose consumption and lactate
production experiments. The mRNA and protein expression of CAF glycolytic
enzymes, lactate dehydrogenase and pyruvate kinase m2, were examined by RT-PCR
and western blotting, respectively. In vitro culture first-generation pancreatic
CAFs were collected and cultured together with pancreas cancer BxPc-3 and Panc-1
cells. Cell invasion and migration were assessed using a Transwell assay and
scratch test, respectively. Mitochondrial activity was assessed by experimentally
determining oxidative phosphorylation (OP) activity. The aerobic oxidation index
of cancer cells was also examined. Succinate dehydrogenase, fumarate hydratase
(FH), and monocarboxylate transporter 1 (MCT1) expression were examined using an
MCT1-specific inhibitor to remove 'tumor-stromal' metabolic coupling to observe
the influence of cell interstices on pancreas cancer progression.
First-generation isolated cultured CAFs and NFs both grew well, and showed active
proliferation. Glucose absorption and lactate production were significantly
enhanced in CAFs compared with that in NFs. PCR and western blotting showed that
the lactate dehydrogenase and pyruvate kinase m2 mRNA and protein expression
levels were increased in the CAFs. After indirect co-culture, OP was increased in
the BxPc-3 and Panc-1 cells; correspondingly, succinate dehydrogenase, FH and MCT
expression were increased. After the MCT1-specific inhibitor removed
'tumor-stromal' metabolic coupling, the migration and invasion abilities of the
pancreatic cancer cells were decreased. Pancreatic CAFs can alter metabolism as
well as communicate with and respond to cancer cell migration and invasion. This
may be an important mechanism for promoting tumor progression in a non-vascular
manner in the tumor microenvironment. The mechanism by which CAFs reshape
metabolic transition requires further analysis.