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2017 ; 9
(1
): 1320193
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Porphyromonas gingivalis suppresses invasion of Fusobacterium nucleatum into
gingival epithelial cells
#MMPMID28748028
Jung YJ
; Jun HK
; Choi BK
J Oral Microbiol
2017[]; 9
(1
): 1320193
PMID28748028
show ga
Invasion of periodontal pathogens into periodontal tissues is an important step
that can cause tissue destruction in periodontal diseases. Porphyromonas
gingivalis is a keystone pathogen and its gingipains are key virulence factors.
Fusobacterium nucleatum is a bridge organism that mediates coadhesion of
disease-causing late colonizers such as P. gingivalis and early colonizers during
the development of dental biofilms. The aim of this study was to investigate how
P. gingivalis, in particular its gingipains, influences the invasion of
coinfecting F. nucleatum into gingival epithelial cells. When invasion of F.
nucleatum was analyzed after 4 h of infection, invasion of F. nucleatum was
suppressed in the presence of P. gingivalis compared with during monoinfection.
However, coinfection with a gingipain-null mutant of P. gingivalis did not affect
invasion of F. nucleatum. Inhibition of PI3K reduced invasion of F. nucleatum. P.
gingivalis inactivated the PI3K/AKT pathway, which was also dependent on
gingipains. Survival of intracellular F. nucleatum was promoted by P. gingivalis
with Arg gingipain mutation. The results suggest that P. gingivalis, in
particular its gingipains, can affect the invasion of coinfecting F. nucleatum
through modulating intracellular signaling of the host cells.