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Modification of Helicobacter pylori peptidoglycan enhances NOD1 activation and promotes cancer of the stomach

Journal Article · · Cancer Research
 [1];  [2];  [2];  [3];  [3];  [3];  [3];  [4];  [2];  [2]
  1. Vanderbilt Univ., Nashville, TN (United States); DOE Office of Scientific and Technical Information (OSTI)
  2. Vanderbilt Univ., Nashville, TN (United States)
  3. Univ. of Georgia, Athens, GA (United States)
  4. National Univ. of Colombia, Bogota (Colombia); Hospital El Tunal Unit of Gastroenterology, Bogota (Colombia)
Helicobacter pylori is the strongest known risk factor for gastric carcinogenesis. One cancer-linked locus is the cag pathogenicity island, which translocates components of peptidoglycan (PGN) into host cells. NOD1 is an intracellular immune receptor that senses PGN from Gram-negative bacteria and responds by inducing autophagy and activating NF-κB, leading to inflammation-mediated bacterial clearance; however chronic pathogens can evade NOD1-mediated clearance by altering PGN structure. We previously demonstrated that the H. pylori cag+ strain 7.13 rapidly induces gastric cancer in Mongolian gerbils. Using 2D-DIGE and mass spectrometry, we identified a novel mutation within the gene encoding the peptidoglycan deacetylase PgdA; therefore, we sought to define the role of H. pylori PgdA in NOD1-dependent activation of NF-κB, inflammation, and cancer. Co-culture of H. pylori strain 7.13 or its pgdA$$-$$ isogenic mutant with AGS gastric epithelial cells or HEK293 epithelial cells expressing a NF-κB reporter revealed that pgdA inactivation significantly decreased NOD1-dependent NF-κB activation and autophagy. Infection of Mongolian gerbils with an H. pylori pgdA$$-$$ mutant strain led to significantly decreased levels of inflammation and malignant lesions in the stomach; however, pre-activation of NOD1 prior to bacterial challenge reciprocally suppressed inflammation and cancer in response to wild-type H. pylori. Expression of NOD1 differs in human gastric cancer specimens compared to non-cancer samples harvested from the same patients. In conclusion, these results indicate that PGN deacetylation plays an important role in modulating host inflammatory responses to H. pylori, allowing the bacteria to persist and induce carcinogenic consequences in the gastric niche.
Research Organization:
Univ. of Georgia, Athens, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-93ER20097
OSTI ID:
1345502
Journal Information:
Cancer Research, Journal Name: Cancer Research Journal Issue: 8 Vol. 75; ISSN 0008-5472
Publisher:
American Association for Cancer ResearchCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (18)

Harnessing the untapped potential of nucleotide‐binding oligomerization domain ligands for cancer immunotherapy journal December 2018
Pathogenic H elicobacter pylori strains translocate DNA and activate TLR9 via the cancer-associated cag type IV secretion system journal May 2016
Chemopreventive effect of chalcone derivative, L2H17, in colon cancer development journal November 2015
Differential inflammatory response to Helicobacter pylori infection: etiology and clinical outcomes journal August 2015
Nucleotide-binding oligomerization domain 1 and gastrointestinal disorders journal January 2017
MiR-22 sustains NLRP3 expression and attenuates H. pylori-induced gastric carcinogenesis journal October 2017
Helicobacter pylori infection promotes Aquaporin 3 expression via the ROS–HIF-1α–AQP3–ROS loop in stomach mucosa: a potential novel mechanism for cancer pathogenesis journal March 2018
NOD1 modulates IL-10 signalling in human dendritic cells journal April 2017
NOD-like receptors: major players (and targets) in the interface between innate immunity and cancer journal April 2019
α-Difluoromethylornithine reduces gastric carcinogenesis by causing mutations in Helicobacter pylori cagY journal February 2019
Lytic transglycosylases: concinnity in concision of the bacterial cell wall journal June 2017
NOD1 mediates non-canonical inflammasome processing of interleukin-18 in epithelial cells to Helicobacter pylori infection preprint March 2019
A novel peptidoglycan D,L-endopeptidase induced by S almonella inside eukaryotic cells contributes to virulence: Peptidoglycan of intracellular Salmonella journal November 2015
Hydrogen Metabolism in Helicobacter pylori Plays a Role in Gastric Carcinogenesis through Facilitating CagA Translocation journal August 2016
Epidermal growth factor receptor inhibition downregulates Helicobacter pylori -induced epithelial inflammatory responses, DNA damage and gastric carcinogenesis journal May 2017
Proteome profiling of triple negative breast cancer cells overexpressing NOD1 and NOD2 receptors unveils molecular signatures of malignant cell proliferation journal February 2019
Role of the NLRP3 inflammasome in cancer journal November 2018
Helicobacter pylori -induced inflammation and epigenetic changes during gastric carcinogenesis journal January 2015

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