Microbiota according to gastric topography in patients with low or high risk of gastric cancer in Nariño, Colombia

Juan Camilo Caguazango, Álvaro Jairo Pazos, .

Keywords: Gastrointestinal microbiome, Helicobacter pylori, 16S rRNA gene, metagenomics, stomach neoplasms

Abstract

Introduction: Inflammation in the gastric antrum caused by Helicobacter pylori increases the risk of duodenal ulcer while inflammation in the body generates atrophic gastritis and increased risk of gastric cancer. These inflammatory responses according to gastric topography could be explained by the composition of the gastric microbiota associated with H. pylori.
Objective: To identify and compare the microbiota of the gastric antrum and body of individuals from two populations, one with high risk and one with low risk of gastric cancer from Nariño, Colombia.
Materials and methods: Biopsies of the gastric antrum and body of patients with non-atrophic gastritis or metaplastic atrophic gastritis were included. The microbiota was defined by sequencing the 16S rRNA gene, V3-V4 region, (illumina-MiSeq™). The operational taxonomic units were classified using the BLASTn and RDPII databases. The differences among microbial populations were evaluated with the PERMANOVA and multivariate analyses.
Results: The Epsilonproteobacteria class represented by H. pylori was more abundant in the antrum and body biopsies of individuals with metaplastic atrophic gastritis (>50%) while in individuals with non-atrophic gastritis it was 20 % and had greater metagenomic diversity. Helicobacter pylori infection significantly decreases the metagenomic diversity of the gastric antrum (p=0.005) compared to that of the body.
Conclusions: The bacterial groups involved in the dysbiosis can colonize both topographic regions of the stomach, regardless of the sectorized inflammation responses. Helicobacter pylori infection associated with the gastric microbiota is related to its localization in the stomach, the type of lesion, and the population at risk of gastric cancer, which suggests its importance in microbial dysbiosis and gastric disease.

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  • Juan Camilo Caguazango Grupo de Investigación en Salud Pública, Centro de Estudios en Salud, Universidad de Nariño, Pasto, Colombia http://orcid.org/0000-0002-6717-617X
  • Álvaro Jairo Pazos Grupo de Investigación en Salud Pública, Centro de Estudios en Salud, Universidad de Nariño, Pasto, Colombia; Departamento de Biología, Universidad de Nariño, Pasto, Colombia http://orcid.org/0000-0001-5603-7898

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How to Cite
1.
Caguazango JC, Pazos Álvaro J. Microbiota according to gastric topography in patients with low or high risk of gastric cancer in Nariño, Colombia. Biomed. [Internet]. 2019 Aug. 1 [cited 2025 Apr. 12];39(Supl. 2):157-71. Available from: https://revistabiomedicaorg.biteca.online/index.php/biomedica/article/view/4520

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Published
2019-08-01

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