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2018 ; 15
(5
): 7144-7152
Nephropedia Template TP
gab.com Text
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English Wikipedia
Conversion of epithelial-to-mesenchymal transition to mesenchymal-to-epithelial
transition is mediated by oxygen concentration in pancreatic cancer cells
#MMPMID29731878
Chen S
; Chen X
; Li W
; Shan T
; Lin WR
; Ma J
; Cui X
; Yang W
; Cao G
; Li Y
; Wang L
; Kang Y
Oncol Lett
2018[May]; 15
(5
): 7144-7152
PMID29731878
show ga
Tumor metastasis is accompanied by a two-stage process of
epithelial-to-mesenchymal transition (EMT) and mesenchymal-to-epithelial
transition (MET). Currently, the exact mechanisms underlying EMT-MET conversion
are unclear. In the present study, the mechanisms by which primary sites
(hypoxic) and homing sites (normoxic or hyperoxic) participate in EMT-MET
conversion were evaluated. Pancreatic cancer cells were grown under different
oxygenation conditions. Cell morphology and epithelial (E)-cadherin and vimentin
expression were examined. Transwell chambers were used to examine tumor
invasiveness, and scratch assays were performed to examine cell migration.
Reverse transcription-polymerase chain reaction and western blot analysis were
used to quantitate the mRNA and protein expression of E-cadherin, vimentin, Snail
and hypoxia-inducible factor (HIF)-1?. BxPc-3 and Panc-1 cells grown under
hypoxic conditions demonstrated increased partial EMT, reduced E-cadherin
expression, and increased vimentin expression, compared with cells grown under
normoxic or hyperoxic conditions. Cells grown under hypoxic conditions also
indicated increased migration and invasiveness. HIF-1? mRNA and protein
expression was increased in cells grown under hypoxic conditions. These changes
were reversed when a specific inhibitor of the HIF-1? receptor was used to block
HIF-1? signaling. Differences in oxygen concentration at primary sites and homing
sites are important in the EMT-MET process, and the underlying mechanism may
involve HIF-1?-Snail signaling.