Abstract
Background
Recent epidemiological studies suggested correlation between gastric cancer (GC) and periodontal disease.
Aims
We aim to clarify involvement of lipopolysaccharide of Porphyromonas gingivalis (Pg.), one of the red complex periodontal pathogens, in the GC development.
Methods
To evaluate barrier function of background mucosa against the stimulations, we applied biopsy samples from 76 patients with GC using a Ussing chamber system (UCs). K19-Wnt1/C2mE transgenic (Gan) mice and human GC cell-lines ± THP1-derived macrophage was applied to investigate the role of Pg. lipopolysaccharide in inflammation-associated carcinogenesis.
Results
In the UCs, Pg. lipopolysaccharide reduced the impedance of metaplastic and inflamed mucosa with increases in mRNA expression of toll-like receptor (TLR) 2, tumor necrosis factor (TNF) α, and apoptotic markers. In vitro, Pg. lipopolysaccharide promoted reactive oxidative stress (ROS)-related apoptosis as well as activated TLR2-β-catenin-signaling on MKN7, and it increased the TNFα production on macrophages, respectively. TNFα alone activated TLR2-β-catenin-signaling in MKN7, while it further increased ROS and TNFα in macrophages. Under coculture with macrophages isolated after stimulation with Pg. lipopolysaccharide, β-catenin-signaling in MKN7 was activated with an increase in supernatant TNFα concentration, both of which were decreased by adding a TNFα neutralization antibody into the supernatant. In Gan mice with 15-week oral administration of Pg. lipopolysaccharide, tumor enlargement with β-catenin-signaling activation were observed with an increase in TNFα with macrophage infiltration.
Conclusions
Local exposure of Pg. lipopolysaccharide may increase ROS on premalignant gastric mucosa to induce apoptosis-associated barrier dysfunction and to secrete TNFα from activated macrophages, and both stimulation of Pg. lipopolysaccharide and TNFα might activate TLR2-β-catenin-signaling in GC.
Graphical Abstract
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Abbreviations
- LPS:
-
Lipopolysaccharide
- mUCs:
-
mini-Ussing chamber system
- NAC:
-
N-acetyl-l-cysteine
- Pg.:
-
Porphyromonas gingivalis
- PG:
-
Peptidoglycan
- uSS:
-
Updated Sydney system
- qPCR:
-
Quantitative polymerase chain reaction
- ROS:
-
Reactive oxygen species
- shRNA:
-
Short hairpin RNA
- TLR:
-
Toll-like receptor
- TNFα:
-
Tumor necrosis factor α
- TUNEL:
-
TdT-mediated dUTP nick end labeling
- HRP:
-
Horse radish peroxidase
- GC:
-
Gastric cancer
- H. pylori :
-
Helicobacter pylori
- post-eradication GC:
-
Gastric cancer after eradication treatment of H. pylori
- PMA:
-
Phorbol 12-myristate 13-acetate
- Mφ:
-
Macrophages
- Gan mice:
-
K19-Wnt1/C2mE transgenic mice
- IQR:
-
Interquartile range
- SD:
-
Standard deviation
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Acknowledgments
We thank Biomedical Research Unit of Tohoku University Hospital for technical support, and we thank the Cancer Research Institute of Kanazawa University for kind gift of K19-Wnt1/C2mE mice.
Funding
This work was supported by JSPS KAKENHI grant number 19K08434, and the grant for Basic Research of the Japanese Society for Helicobacter research (2020).
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Supplementary file1 (TIF 3813 kb)
Supplementary Figure. Comprehensive analysis of h-Pg. LPS-stimulated apoptosis-related gene expressions in MKN7. The apoptosis antibody array demonstrated the induction of the proteins of apoptosis-signaling and TNF-signaling in MKN7 (N = 2: Int/pos = the ratio of signal of the target gene per those of positive control).
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Oriuchi, M., Lee, S., Uno, K. et al. Porphyromonas gingivalis Lipopolysaccharide Damages Mucosal Barrier to Promote Gastritis-Associated Carcinogenesis. Dig Dis Sci 69, 95–111 (2024). https://doi.org/10.1007/s10620-023-08142-6
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DOI: https://doi.org/10.1007/s10620-023-08142-6