OBJECTIVES: Gastric colonisation with intestinal flora (IF) has been shown to promote Helicobacter pylori (Hp)-associated gastric cancer. However, it is unknown if the mechanism involves colonisation with specific or diverse microbiota secondary to gastric atrophy. DESIGN: Gastric colonisation with Altered Schaedler's flora (ASF) and Hp were correlated with pathology, immune responses and mRNA expression for proinflammatory and cancer-related genes in germ-free (GF), Hp monoassociated (mHp), restricted ASF (rASF; 3 species), and specific pathogen-free (complex IF), hypergastrinemic INS-GAS mice 7 months postinfection. RESULTS: Male mice cocolonised with rASFHp or IFHp developed the most severe pathology. IFHp males had the highest inflammatory responses, and 40% developed invasive gastrointestinal intraepithelial neoplasia (GIN). Notably, rASFHp colonisation was highest in males and 23% developed invasive GIN with elevated expression of inflammatory biomarkers. Lesions were less severe in females and none developed GIN. Gastritis in male rASFHp mice was accompanied by decreased Clostridum species ASF356 and Bacteroides species ASF519 colonisation and an overgrowth of Lactobacillus murinus ASF361, supporting that inflammation-driven atrophy alters the gastric niche for GI commensals. Hp colonisation also elevated expression of IL-11 and cancer-related genes, Ptger4 and Tgf-β, further supporting that Hp infection accelerates gastric cancer development in INS-GAS mice. CONCLUSIONS: rASFHp colonisation was sufficient for GIN development in males, and lower GIN incidence in females was associated with lower inflammatory responses and gastric commensal and Hp colonisation. Colonisation efficiency of commensals appears more important than microbial diversity and lessens the probability that specific gastrointestinal pathogens are contributing to cancer risk.
OBJECTIVES: Gastric colonisation with intestinal flora (IF) has been shown to promote Helicobacter pylori (Hp)-associated gastric cancer. However, it is unknown if the mechanism involves colonisation with specific or diverse microbiota secondary to gastric atrophy. DESIGN: Gastric colonisation with Altered Schaedler's flora (ASF) and Hp were correlated with pathology, immune responses and mRNA expression for proinflammatory and cancer-related genes in germ-free (GF), Hp monoassociated (mHp), restricted ASF (rASF; 3 species), and specific pathogen-free (complex IF), hypergastrinemic INS-GASmice 7 months postinfection. RESULTS: Male mice cocolonised with rASFHp or IFHp developed the most severe pathology. IFHp males had the highest inflammatory responses, and 40% developed invasive gastrointestinal intraepithelial neoplasia (GIN). Notably, rASFHp colonisation was highest in males and 23% developed invasive GIN with elevated expression of inflammatory biomarkers. Lesions were less severe in females and none developed GIN. Gastritis in male rASFHpmice was accompanied by decreased Clostridum species ASF356 and Bacteroides species ASF519 colonisation and an overgrowth of Lactobacillus murinus ASF361, supporting that inflammation-driven atrophy alters the gastric niche for GI commensals. Hp colonisation also elevated expression of IL-11 and cancer-related genes, Ptger4 and Tgf-β, further supporting that Hp infection accelerates gastric cancer development in INS-GAS mice. CONCLUSIONS: rASFHp colonisation was sufficient for GIN development in males, and lower GIN incidence in females was associated with lower inflammatory responses and gastric commensal and Hp colonisation. Colonisation efficiency of commensals appears more important than microbial diversity and lessens the probability that specific gastrointestinal pathogens are contributing to cancer risk.
Authors: Gregory P Boivin; Kay Washington; Kan Yang; Jerrold M Ward; Theresa P Pretlow; Robert Russell; David G Besselsen; Virginia L Godfrey; Tom Doetschman; William F Dove; Henry C Pitot; Richard B Halberg; Steven H Itzkowitz; Joanna Groden; Robert J Coffey Journal: Gastroenterology Date: 2003-03 Impact factor: 22.682
Authors: Janet G M Markle; Daniel N Frank; Steven Mortin-Toth; Charles E Robertson; Leah M Feazel; Ulrike Rolle-Kampczyk; Martin von Bergen; Kathy D McCoy; Andrew J Macpherson; Jayne S Danska Journal: Science Date: 2013-01-17 Impact factor: 47.728
Authors: Johan Dicksved; Mathilda Lindberg; Magnus Rosenquist; Helena Enroth; Janet K Jansson; Lars Engstrand Journal: J Med Microbiol Date: 2009-04 Impact factor: 2.472
Authors: Guoqin Yu; Nan Hu; Lemin Wang; Chaoyu Wang; Xiao-You Han; Mike Humphry; Jacques Ravel; Christian C Abnet; Philip R Taylor; Alisa M Goldstein Journal: Int J Cancer Date: 2017-04-03 Impact factor: 7.396
Authors: Meghan Wymore Brand; Michael J Wannemuehler; Gregory J Phillips; Alexandra Proctor; Anne-Marie Overstreet; Albert E Jergens; Roger P Orcutt; James G Fox Journal: ILAR J Date: 2015