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Isaeva G, Valieva R. Biological characteristics and virulence of Helicobacter pylori. CLINICAL MICROBIOLOGY AND ANTIMICROBIAL CHEMOTHERAPY 2018. [DOI: 10.36488/cmac.2018.1.14-23] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Abstract
This review summarizes the most recent data on the biological characteristics of Helicobacter pylori (morphological, cultural, biochemical). H. pylori pathogenicity factors promoting colonization, adhesion, biofilm formation, aggression, and cytotoxicity, their contribution to the pathogenesis of diseases as well as the possible relationships with various clinical outcomes are described in detail. The genetic heterogeneity of H. pylori strains which can determine different clinical manifestations and have significance for conducting epidemiological studies is also considered.
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Affiliation(s)
- G.Sh. Isaeva
- Kazan Research Institute of Epidemiology and Microbiology; Kazan State Medical University (Kazan, Russia)
| | - R.I. Valieva
- Kazan Research Institute of Epidemiology and Microbiology; KazanState Medical University (Kazan, Russia)
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Itthitaetrakool U, Pinlaor P, Pinlaor S, Chomvarin C, Dangtakot R, Chaidee A, Wilailuckana C, Sangka A, Lulitanond A, Yongvanit P. Chronic Opisthorchis viverrini Infection Changes the Liver Microbiome and Promotes Helicobacter Growth. PLoS One 2016; 11:e0165798. [PMID: 27806126 PMCID: PMC5091914 DOI: 10.1371/journal.pone.0165798] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 10/18/2016] [Indexed: 12/21/2022] Open
Abstract
Adults of Opisthorchis viverrini reside in the biliary system, inducing inflammation of bile ducts and cholangitis, leading to hepatobiliary disease (HBD) including cholangiocarcinoma. O. viverrini infection also has major implications for the bacterial community in bile ducts and liver. To investigate this in chronic O. viverrini infection (≥ 8 months p.i.), bacterial genomic DNA from livers of hamsters and from worms was investigated using culture techniques, PCR for Helicobacter spp. and high-throughput next-generation sequencing targeting the V3-V4 hypervariable regions of prokaryotic 16S rRNA gene. Of a total of 855,046 DNA sequence reads, 417,953 were useable after filtering. Metagenomic analyses assigned these to 93 operational taxonomic units (OTUs) consisting of 80 OTUs of bacteria, including 6 phyla and 42 genera. In the chronic O. viverrini-infected group, bacterial community composition and diversity were significantly increased compared to controls. Sequences of Fusobacterium spp. were the most common (13.81%), followed by Streptococcus luteciae (10.76%), Escherichia coli (10.18%), and Bifidobacterium spp. (0.58%). In addition, Helicobacter pylori (0.17% of sequences) was also identified in the liver of chronic O. viverrini infections, but not in normal liver. The presence of H. pylori was confirmed by PCR and by use of an antibody against bacterial antigen, supporting the metagenomics data. The identities of bacteria cultured for enrichment suggested that chronic O. viverrini infection changes the liver microbiome and promotes Helicobacter spp. growth. There may be synergy between O. viverrini and the liver microbiome in enhancing immune response-mediated hepatobiliary diseases.
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Affiliation(s)
- Upsornsawan Itthitaetrakool
- Biomedical Science Program, Graduate School, Khon Kaen University, Khon Kaen, Thailand
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Porntip Pinlaor
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
- * E-mail:
| | - Somchai Pinlaor
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Chariya Chomvarin
- Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Rungtiwa Dangtakot
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
- Science Program in Medical Technology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Apisit Chaidee
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Chotechana Wilailuckana
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Arunnee Sangka
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Aroonlug Lulitanond
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Puangrat Yongvanit
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand
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Hernández C, Serrano CA, Villagrán A, Torres J, Venegas A, Harris PR. Helicobacter pylori vacA virulence factor in uncultured Helicobacter heilmannii sensu lato from an infected child. JMM Case Rep 2016. [DOI: 10.1099/jmmcr.0.005026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Caroll Hernández
- Department of Pediatric Gastroenterology and Nutrition, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Carolina A. Serrano
- Department of Pediatric Gastroenterology and Nutrition, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Andrea Villagrán
- Department of Pediatric Gastroenterology and Nutrition, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Javiera Torres
- Department of Pathology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alejandro Venegas
- Faculty of Medicine, Centro de Investigación Biomédica, Universidad Diego Portales, Santiago, Chile
| | - Paul R. Harris
- Department of Pediatric Gastroenterology and Nutrition, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
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Murano A, Morinaga N, Iwamaru Y, Yahiro K, Tagashira M, Moss J, Tanzawa H, Noda M. Acidic conditions enhance bactericidal effects of sodium bisulfite on Helicobacter pylori. Helicobacter 2005; 10:132-5. [PMID: 15810943 DOI: 10.1111/j.1523-5378.2005.00299.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
BACKGROUND The Brucella broth medium, which is often used for the cultivation of microaerobic bacteria including Helicobacter pylori. It contains sodium bisulfite to decrease oxygen content in the medium. The growth of H. pylori, however, is inhibited by sodium bisulfite. In this study, the effect of sodium bisulfite was compared with several antioxidants and quantified under acidic conditions, mimicking the gastric environment. METHODS Growth of H. pylori in the presence of several antioxidants was evaluated at OD655 nm. Effect of sodium bisulfite on H. pylori under acidic conditions was evaluated by measuring colony forming units (cfu). RESULTS Under neutral conditions, sodium bisulfite was a more potent suppressor of H. pylori. Resveratrol, a polyphenol found in wine, exhibited the most potent inhibitory activity. To quantify the effect of sodium bisulfite on H. pylori under acidic conditions, the bacteria were grown at 37 degrees C for 30 minutes in 0.15 mol/l HCl/KCl (pH 2.0) with or without urea and sodium bisulfite. Sodium bisulfite (0.5 mmol/l) did not affect the viability at neutral pH 7.0, however, it killed H. pylori under acidic conditions, even if urea, the key substance enabling H. pylori to survive under acidic conditions, was present. The bacteria, which had been incubated under acidic conditions in the presence of urea, could survive a subsequent 30 minute-incubation at pH 2.0 without urea. Presence of sodium bisulfite, however, in the subsequent 30 minute-incubation, killed the bacteria. CONCLUSIONS The bactericidal effect of sodium bisulfite on H. pylori was greater under acidic conditions and independent of urease activity.
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Affiliation(s)
- Akiyuki Murano
- Department of Clinical Molecular Biology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku Chiba, 260-8670, Japan
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