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2018 ; 9
(ä): 1588
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Toll-Like Receptor 2-Mediated Suppression of Colorectal Cancer Pathogenesis by
Polysaccharide A From Bacteroides fragilis
#MMPMID30065713
Sittipo P
; Lobionda S
; Choi K
; Sari IN
; Kwon HY
; Lee YK
Front Microbiol
2018[]; 9
(ä): 1588
PMID30065713
show ga
The beneficial role of gut microbiota in intestinal diseases has been highlighted
recently. Bacteroides fragilis found in the human gastrointestinal tract is a
well-studied example of a beneficial bacterium that protects against intestinal
inflammation. Polysaccharide A (PSA) from B. fragilis induces the production of
interleukin (IL)-10 from immune cells via Toll-like receptor 2 (TLR2) signaling
in animal colitis models. The direct effect of PSA on human colorectal cancer
(CRC) cells has not been studied. Here, we report the effect of PSA from B.
fragilis on CRC pathogenesis in SW620 and HT29 CRC cells and the molecular
signaling underlying these effects. We demonstrated that PSA induced the
production of the pro-inflammatory cytokine, IL-8, but not IL-10, in CRC cells.
PSA inhibited CRC cell proliferation by controlling the cell cycle and impaired
CRC cell migration and invasion by suppressing epithelial mesenchymal transition.
Moreover, as in the case of other animal intestinal diseases, the protective role
of PSA against CRC pathogenesis was also mediated by TLR2. Our results reveal
that PSA from B. fragilis plays a protective role against CRC via TLR2 signaling.