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Abstract
Gastric environment has long been considered sterile, but the discovery of Helicobacter pylori (H. pylori) changed such concept in 1982. Over the past few decades, modern techniques have provided insight into microbial communities in the stomach and the interactions between communities, ranging from methods that rely on bacterial culture to the application of macrogenomics and high-throughput sequencing techniques. H. pylori is an important risk factor for gastric disease, but there may be other bacteria involved in the occurrence of gastric disease. This review summarizes the current progress in the understanding of the relationship between gastric microflora and gastric disease.
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Affiliation(s)
- Fang Liu
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, Key Laboratory of High Altitude Enviroesnment and Genes Related to Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, Shaanxi Province, China
| | - Tian Liang
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, Key Laboratory of High Altitude Enviroesnment and Genes Related to Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, Shaanxi Province, China
| | - Yan-Song Li
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, Key Laboratory of High Altitude Enviroesnment and Genes Related to Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, Shaanxi Province, China
| | - Su Bai
- Department of Digestive Medicine, Affiliated Hospital of Tibet University for Nationalities, Xianyang 712082, Shaanxi Province, China
| | - Long-Li Kang
- Key Laboratory for Molecular Genetic Mechanisms and Intervention Research on High Altitude Disease of Tibet Autonomous Region, Key Laboratory of High Altitude Enviroesnment and Genes Related to Diseases of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, Shaanxi Province, China
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Moles L, Gómez M, Jiménez E, Bustos G, de Andrés J, Melgar A, Escuder D, Fernández L, Del Campo R, Rodríguez JM. Bacterial Diversity of the Gastric Content of Preterm Infants during Their First Month of Life at the Hospital. Front Nutr 2017; 4:12. [PMID: 28459051 PMCID: PMC5394887 DOI: 10.3389/fnut.2017.00012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 03/29/2017] [Indexed: 12/26/2022] Open
Abstract
Studies focused on the stomach microbiota are relatively scarce, and most of them are focused on the adult population. The aim of this work is to describe the bacterial communities inhabiting the gastric content (GC) of preterm neonates. For that purpose, GC samples were collected weekly from a total of 13 preterm neonates during their first month of life within their hospital stay. Samples were analyzed by using both culture-dependent and -independent techniques. The former allowed the isolation of bacteria belonging mainly to the genera Enterococcus, Staphylococcus, Streptococcus, Serratia, Klebsiella, and Escherichia. The cultured dominant species in the GC samples during all the hospitalization period were Enterococcus faecalis and Staphylococcus epidermidis. Multilocus sequence typing (MLST) analysis revealed the presence of high-risk clonal complexes associated with the hospital environment, which may colonize enteral feeding tubes. Similarly, the 16S rRNA sequencing showed that Streptococcus, Staphylococcus, Lactobacillus, Enterococcus, Corynebacterium, and Propionibacterium were the dominant genera present at 75% of the gastric samples. However, the genera Serratia, Klebsiella, and Streptococcus were the most abundant. Own mother's milk (OMM) and donor milk (DM) were collected after their pass through the external feeding tubes to assess their bacterial content. OMM and DM had a similar bacterial pattern to GC. Based on these data, the GC of preterm neonates is dominated by Proteobacteria and Firmicutes and harbors high-risk bacterial clones, which may colonize enteral feeding tubes, and therefore the feeds that pass through them.
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Affiliation(s)
- Laura Moles
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain
| | - Marta Gómez
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain
| | - Esther Jiménez
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain.,ProbiSearch, S.L., Tres Cantos, Madrid, Spain
| | - Gerardo Bustos
- Servicio de Neonatología, Hospital Universitario 12 de Octubre, Madrid, Spain.,Red de Salud Materno-Infantil y del Desarrollo (SAMID), Barakaldo, Spain
| | - Javier de Andrés
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain
| | - Ana Melgar
- Servicio de Neonatología, Hospital Universitario 12 de Octubre, Madrid, Spain.,Red de Salud Materno-Infantil y del Desarrollo (SAMID), Barakaldo, Spain
| | - Diana Escuder
- Servicio de Neonatología, Hospital Universitario 12 de Octubre, Madrid, Spain.,Red de Salud Materno-Infantil y del Desarrollo (SAMID), Barakaldo, Spain
| | - Leónides Fernández
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain.,ProbiSearch, S.L., Tres Cantos, Madrid, Spain
| | - Rosa Del Campo
- Instituto Ramón y Cajal de Investigaciones Sanitarias (IRYCIS), Madrid, Spain.,Servicio de Microbiología, Hospital Universitario Ramón y Cajal, Madrid, Spain.,Spanish Network for Research in Infectious Diseases (REIPI), Seville, Spain.,Instituto de Salud Carlos III, Madrid, Spain
| | - Juan Miguel Rodríguez
- Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid, Spain.,ProbiSearch, S.L., Tres Cantos, Madrid, Spain
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He C, Yang Z, Lu N. Imbalance of Gastrointestinal Microbiota in the Pathogenesis of Helicobacter pylori-Associated Diseases. Helicobacter 2016; 21:337-48. [PMID: 26876927 DOI: 10.1111/hel.12297] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The development of new nucleotide sequencing techniques and advanced bioinformatics tools has opened the field for studying the diversity and complexity of the gastrointestinal microbiome independent of traditional cultural methods. Owing largely to the gastric acid barrier, the human stomach was long thought to be sterile. The discovery of Helicobacter pylori, the gram-negative bacterium that infects upwards of 50% of the global population, has started a major paradigm shift in our understanding of the stomach as an ecologic niche for bacteria. Recent sequencing analysis of gastric microbiota showed that H. pylori was not alone and the interaction of H. pylori with those microorganisms might play a part in H. pylori-associated diseases such as gastric cancer. In this review, we summarize the available literature about the changes of gastrointestinal microbiota after H. pylori infection in humans and animal models, and discuss the possible underlying mechanisms including the alterations of the gastric environment, the secretion of hormones and the degree of inflammatory response. In general, information regarding the composition and function of gastrointestinal microbiome is still in its infancy, future studies are needed to elucidate whether and to what extent H. pylori infection perturbs the established microbiota. It is assumed that clarifying the role of gastrointestinal communities in H. pylori-associated diseases will provide an opportunity for translational application as a biomarker for the risk of serious H. pylori diseases and perhaps identify specific organisms for therapeutic eradication.
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Affiliation(s)
- Cong He
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi Province, China
| | - Zhen Yang
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi Province, China
| | - Nonghua Lu
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi Province, China.
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Iizasa H, Ishihara S, Richardo T, Kanehiro Y, Yoshiyama H. Dysbiotic infection in the stomach. World J Gastroenterol 2015; 21:11450-11457. [PMID: 26523109 PMCID: PMC4616220 DOI: 10.3748/wjg.v21.i40.11450] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 07/10/2015] [Accepted: 09/15/2015] [Indexed: 02/06/2023] Open
Abstract
Microbiota in human alimentary tract plays important roles for homeostatic maintenance of the body. Compositional difference of gut microbiota is tightly associated with susceptibility of many diseases, including inflammatory diseases, obesity, diabetes mellitus, cancer, and atherosclerosis. “Dysbiosis” refers to a state of imbalance among the colonies of microorganisms within the body, which brings abnormal increase of specific minor components and decrease in the normally dominant species. Since stomach secrets strong acid for its digestive role, this organ has long been thought a sterile organ. However, the discovery of Helicobacter pylori (H. pylori) has changed the concept. This bacterium has proven to cause gastritis, peptic ulcer, and gastric cancer. However, recent cross-sectional studies revealed that H. pylori carriers had a decreased risk of developing immunological diseases, such as asthma. H. pylori coinfection also suppresses inflammatory bowel diseases. This review describes human gastric microbiota by discussing its mutual interaction and pathogenic enrollment. Gastric “dysbiosis” may affect host inflammatory response and play important role for gastric pathogenesis. We will topically discuss enrollment of dysbiosis for genesis of gastric cancer as well as for disruption of immunological homeostasis affecting oncogenic resistance.
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Abstract
Helicobacter pylori relies on multiple colonization and virulence factors to persist in the human stomach for life. In addition, these factors can be modulated and vary to suit the ever-changing environment within the host individual. This article outlines the novel developments in this field of research during the past year, highlighting the cag pathogenicity island, VacA, γ-glutamyl-transpeptidase as well as including recent advances in protein structure, bacteria-host interaction, and the role of stomach microbiota.
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