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2018 ; 12
(2
): 127-137
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Periodontal pathogens promote epithelial-mesenchymal transition in oral squamous
carcinoma cells in vitro
#MMPMID28873015
Abdulkareem AA
; Shelton RM
; Landini G
; Cooper PR
; Milward MR
Cell Adh Migr
2018[Mar]; 12
(2
): 127-137
PMID28873015
show ga
Epithelial-mesenchymal transition (EMT) is potentially involved in increasing
metastasis of oral squamous cell carcinoma (OSCC). Periodontal pathogens are
well-known for their ability to induce intense immune responses and here we
investigated whether they are involved in inducing EMT. Cultures of OSCC cell
line (H400) were treated separately with heat-killed periodontal pathogens F.
nucleatum, or P. gingivalis or E. coli LPS for 8 d. EMT-associated features were
assayed using sq-PCR and PCR-arrays, for EMT-related markers, and ELISAs for
TGF-?1, TNF-?, and EGF. The migratory ability of cells was investigated using
scratch and transwell migration assays. E-cadherin and vimentin expression was
assessed using immunofluorescence while Snail activation was detected with
immunocytochemistry. In addition, the integrity of the cultured epithelial layer
was investigated using transepithelial electrical resistance (TEER). PCR data
showed significant upregulation after 1, 5, and 8 d in transcription of
mesenchymal markers and downregulation of epithelial ones compared with
unstimulated controls, which were confirmed by immunofluorescence. Periodontal
pathogens also caused a significant increase in level of all cytokines
investigated which could be involved in EMT-induction and Snail activation.
Exposure of cells to the bacteria increased migration and the rate of wound
closure. Downregulation of epithelial markers also resulted in a significant
decrease in impedance resistance of cell monolayers to passage of electrical
current. These results suggested that EMT was likely induced in OSCC cells in
response to stimulation by periodontal pathogens.