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Gollapalli P, Tamizh Selvan G, Santoshkumar HS, Ballamoole KK. Functional insights of antibiotic resistance mechanism in Helicobacter pylori: Driven by gene interaction network and centrality-based nodes essentiality analysis. Microb Pathog 2022; 171:105737. [PMID: 36038087 DOI: 10.1016/j.micpath.2022.105737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/05/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022]
Abstract
Increased antibiotic resistance in Helicobacter pylori (H. pylori), a major human pathogen, constitutes a substantial threat to human health. Understanding the pathophysiology and development of antibiotic resistance can aid our battle with the infections caused by H. pylori. The aim of this study is to discover the high-impact key regulatory mechanisms and genes involved in antimicrobial drug resistance (AMR). In this study, we constructed a functional gene interaction network by integrating multiple sources of data related to antibiotic resistant genes (number-77) from H. pylori. The gene interaction network was assortative, with a hierarchical, scale-free topology enriched in a variety of gene ontology (GO) categories and KEGG pathways. Using an iterative clustering methodology, we identified a number of communities in the AMR gene network that comprised nine genes (sodB, groEL, gyrA, recA, polA, tuf, infB, rpsJ, and gyrB) that were present at the deepest level and hence were key regulators of AMR. Further, an antibiotic-resistant gene network-based centrality analysis revealed superoxide dismutase (sodB) as a bottleneck node in the network. Our findings suggested that sodB is critically enriched in the cellular response to oxidative stress, removal of superoxide radicals, cellular oxidant detoxification processes, cellular component biogenesis, response to reactive oxygen species, urea metabolic process, nitrogen cycle metabolic process and reactive oxygen species metabolic process. We demonstrated how the sodB, which are involved in the response to reactive oxygen species, urea metabolic process, nitrogen cycle metabolic process, reactive oxygen species metabolic process, regulated by Fur gene/proteins, claim a major authority over regulation and signal propagation in the AMR.
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Affiliation(s)
- Pavan Gollapalli
- Center for Bioinformatics and Biostatistics, Nitte (Deemed to Be University), Mangalore, 575018, Karnataka, India; Central Research Laboratory, K. S. Hegde Medical Academy, Nitte (Deemed to be University), Mangalore, 575018, Karnataka, India.
| | - G Tamizh Selvan
- Central Research Laboratory, K. S. Hegde Medical Academy, Nitte (Deemed to be University), Mangalore, 575018, Karnataka, India
| | - H S Santoshkumar
- Department of Biotechnology and Bioinformatics, Jnana Sahyadri Campus, Kuvempu University, Shankaraghatta, 577451, Shivamogga, Karnataka, India
| | - Krishna Kumar Ballamoole
- Nitte (Deemed to be University), Division of Infectious Diseases, Nitte University Centre for Science Education and Research (NUCSER), Paneer Campus, Deralakatte, Mangaluru, Karnataka, 575018, India
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Transcriptome Analysis of the Response of Mature Helicobacter pylori Biofilm to Different Doses of Lactobacillus salivarius LN12 with Amoxicillin and Clarithromycin. Antibiotics (Basel) 2022; 11:antibiotics11020262. [PMID: 35203863 PMCID: PMC8868532 DOI: 10.3390/antibiotics11020262] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/13/2022] [Accepted: 02/15/2022] [Indexed: 02/04/2023] Open
Abstract
Helicobacter pylori is a gastrointestinal pathogen with a high infection rate. Probiotics are clinically used as an adjuvant to improve the cure rate and reduce the side effects of antibiotic treatment for H. pylori. This study is the first to explore the effects of a cell-free supernatant of high- or low-dose Lactobacillus salivarius LN12 combined with amoxicillin (AMX) and clarithromycin (CLR) on H. pylori 3192 biofilms in terms of the biofilm biomass, survival rates, biofilm structure, and transcriptome. The results showed that the combination of the CFS of high-dose LN12 with AMX and CLR had stronger effects on the biofilm biomass, survival rate, and structure of H. pylori 3192 biofilms. H. pylori 3192 biofilms may increase the expression of NADH-related genes and downregulate flagellar assembly and quorum sensing-related receptor genes to deal with the stronger stress effects of high-dose LN12 with AMX and CLR. In conclusion, the biofilm biomass, survival rate, structure, and transcriptome results showed that the combination of LN12 CFS with AMX and CLR had dose effects. We recommend that compared with low doses, high doses of L. salivarus LN12 combined with AMX and CLR may be more effective for H. pylori biofilm than low doses.
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Rogers AC, Van De Hoef D, Sahebally SM, Winter DC. A meta-analysis of carbon dioxide versus room air insufflation on patient comfort and key performance indicators at colonoscopy. Int J Colorectal Dis 2020; 35:455-464. [PMID: 31900583 DOI: 10.1007/s00384-019-03470-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/21/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Carbon dioxide (CO2) has been used as an alternative to air insufflation at endoscopy with good results; however, uptake of the technique has been poor, possibly due to perceived lack of outcome equivalency. This meta-analysis evaluates the effectiveness of CO2 versus air in reducing pain post-colonoscopy and furthermore examines other key performance indicators (KPIs) such as sedative use, procedure times and polyp detection rates. METHODS This meta-analysis was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Pubmed, Pubmed Central, Embase and Cochrane Library were searched for randomized studies from 2004 to 2019, reporting outcomes for patients undergoing colonoscopy with air or CO2 insufflation, who reported pain on a numerical or visual analogue scale (VAS). Results were reported as mean differences (MD) or pooled odds ratios (OR) with 95% confidence intervals (95% CI). RESULTS Of 3586 citations, 23 studies comprising 3217 patients were analysed. Patients undergoing colonoscopy with air insufflation had 30% higher intraprocedural pain scores than those receiving CO2 (VAS 3.4 versus 2.6, MD -0.7, 95% CI - 1.4-0.0, p = 0.05), with a sustained beneficial effect amongst those in the CO2 group at 30 min, 1-2-h and 6-h post procedure (MD - 0.8, - 0.6 and - 0.2, respectively, p < 0.001 for all), as well as less distension, bloating and flatulence (p < 0.01 for all). There were no differences between the two groups in KPIs such as the sedation required, procedure time, caecal intubation or polyp detection rates. CONCLUSIONS CO2 insufflation improves patient comfort without compromising colonoscopic performance.
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Affiliation(s)
- Ailín C Rogers
- Department of Colorectal Surgery, St. Vincent's University Hospital, Dublin, Ireland. .,Centre for Colorectal Disease, University College Dublin, Dublin, Ireland.
| | - Dayna Van De Hoef
- Department of Colorectal Surgery, St. Vincent's University Hospital, Dublin, Ireland.,Centre for Colorectal Disease, University College Dublin, Dublin, Ireland
| | - Shaheel M Sahebally
- Department of Colorectal Surgery, St. Vincent's University Hospital, Dublin, Ireland.,Centre for Colorectal Disease, University College Dublin, Dublin, Ireland
| | - Des C Winter
- Department of Colorectal Surgery, St. Vincent's University Hospital, Dublin, Ireland.,Centre for Colorectal Disease, University College Dublin, Dublin, Ireland
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Zhang H, Zhang Y, Song Z, Li R, Ruan H, Liu Q, Huang X. sncRNAs packaged by Helicobacter pylori outer membrane vesicles attenuate IL-8 secretion in human cells. Int J Med Microbiol 2020; 310:151356. [DOI: 10.1016/j.ijmm.2019.151356] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 08/06/2019] [Accepted: 09/15/2019] [Indexed: 02/07/2023] Open
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Blaser N, Backert S, Pachathundikandi SK. Immune Cell Signaling by Helicobacter pylori: Impact on Gastric Pathology. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1149:77-106. [PMID: 31049845 DOI: 10.1007/5584_2019_360] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Helicobacter pylori represents a highly successful colonizer of the human stomach. Infections with this Gram-negative bacterium can persist lifelong, and although in the majority of cases colonization is asymptomatic, it can trigger pathologies ranging from chronic gastritis and peptic ulceration to gastric cancer. The interaction of the bacteria with the human host modulates immune responses in different ways to enable bacterial survival and persistence. H. pylori uses various pathogenicity-associated factors such as VacA, NapA, CGT, GGT, lipopolysaccharide, peptidoglycan, heptose 1,7-bisphosphate, ADP-heptose, cholesterol glucosides, urease and a type IV secretion system for controlling immune signaling and cellular functions. It appears that H. pylori manipulates multiple extracellular immune receptors such as integrin-β2 (CD18), EGFR, CD74, CD300E, DC-SIGN, MINCLE, TRPM2, T-cell and Toll-like receptors as well as a number of intracellular receptors including NLRP3, NOD1, NOD2, TIFA and ALPK1. Consequently, downstream signaling pathways are hijacked, inducing tolerogenic dendritic cells, inhibiting effector T cell responses and changing the gastrointestinal microbiota. Here, we discuss in detail the interplay of bacterial factors with multiple immuno-regulatory cells and summarize the main immune evasion and persistence strategies employed by H. pylori.
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Affiliation(s)
- Nicole Blaser
- Department of Biology, Institute for Microbiology, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Steffen Backert
- Department of Biology, Institute for Microbiology, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Suneesh Kumar Pachathundikandi
- Department of Biology, Institute for Microbiology, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany.
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Effect of O antigen ligase gene mutation on oxidative stress resistance and pathogenicity of NMEC strain RS218. Microb Pathog 2019; 136:103656. [PMID: 31400443 DOI: 10.1016/j.micpath.2019.103656] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 08/01/2019] [Accepted: 08/05/2019] [Indexed: 12/24/2022]
Abstract
Escherichia coli is one of the primary causes of bacterial sepsis and meningitis in newborns. E. coli RS218, a prototype strain of neonatal meningitis E. coli (NMEC), is often used in research on the pathogenesis of NMEC. Phagocytes are crucial sentinels of immunity, and their antibacterial ability is largely determined by the capability to produce large amounts of ROS. The capacity of bacteria to endure oxidative pressure affects their colonization in the host. Here, we systematically screened the genes that plays key roles in the tolerance of the model of E. coli RS218 to peroxygen environment using a Tn5 mutant library. As a result, a gene encoding O antigen polymerase (O antigen ligase) that contains the Wzy_C superfamily domain (herein designated as Ocw) was identified in E. coli RS218. Furthermore, we constructed an isogenic deletion mutant of ocw gene and its complementary strain in E. coli. Our results revealed that ocw affects the lipopolysaccharide synthesis, ROS tolerance, and survival of E. coli in the host environment. The discovery of ocw provides important clues for better understanding the function of O-antigen.
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Cárdenas-Mondragón MG, Ares MA, Panunzi LG, Pacheco S, Camorlinga-Ponce M, Girón JA, Torres J, De la Cruz MA. Transcriptional Profiling of Type II Toxin-Antitoxin Genes of Helicobacter pylori under Different Environmental Conditions: Identification of HP0967-HP0968 System. Front Microbiol 2016; 7:1872. [PMID: 27920769 PMCID: PMC5118875 DOI: 10.3389/fmicb.2016.01872] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 11/07/2016] [Indexed: 12/24/2022] Open
Abstract
Helicobacter pylori is a Gram-negative bacterium that colonizes the human gastric mucosa and is responsible for causing peptic ulcers and gastric carcinoma. The expression of virulence factors allows the persistence of H. pylori in the stomach, which results in a chronic, sometimes uncontrolled inflammatory response. Type II toxin-antitoxin (TA) systems have emerged as important virulence factors in many pathogenic bacteria. Three type II TA systems have previously been identified in the genome of H. pylori 26695: HP0315-HP0316, HP0892-HP0893, and HP0894-HP0895. Here we characterized a heretofore undescribed type II TA system in H. pylori, HP0967-HP0968, which is encoded by the bicistronic operon hp0968-hp0967 and belongs to the Vap family. The predicted HP0967 protein is a toxin with ribonuclease activity whereas HP0968 is an antitoxin that binds to its own regulatory region. We found that all type II TA systems were expressed in H. pylori during early stationary growth phase, and differentially expressed in the presence of urea, nickel, and iron, although, the hp0968-hp0967 pair was the most affected under these environmental conditions. Transcription of hp0968-hp0967 was strongly induced in a mature H. pylori biofilm and when the bacteria interacted with AGS epithelial cells. Kanamycin and chloramphenicol considerably boosted transcription levels of all the four type II TA systems. The hp0968-hp0967 TA system was the most frequent among 317 H. pylori strains isolated from all over the world. This study is the first report on the transcription of type II TA genes in H. pylori under different environmental conditions. Our data show that the HP0967 and HP0968 proteins constitute a bona fide type II TA system in H. pylori, whose expression is regulated by environmental cues, which are relevant in the context of infection of the human gastric mucosa.
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Affiliation(s)
- María G Cárdenas-Mondragón
- Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatria, Centro Médico Nacional Siglo XXI, IMSS Mexico City, Mexico
| | - Miguel A Ares
- Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatria, Centro Médico Nacional Siglo XXI, IMSS Mexico City, Mexico
| | - Leonardo G Panunzi
- Centre d'Immunologie de Marseille-Luminy, Aix Marseille Université UM2, Inserm, U1104, CNRS UMR7280 Marseille, France
| | - Sabino Pacheco
- Departamento de Microbiología Molecular, Instituto de Biotecnología UNAM Cuernavaca, Mexico
| | - Margarita Camorlinga-Ponce
- Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatria, Centro Médico Nacional Siglo XXI, IMSS Mexico City, Mexico
| | - Jorge A Girón
- Centro de Detección Biomolecular, Benemérita Universidad Autónoma de Puebla Puebla, Mexico
| | - Javier Torres
- Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatria, Centro Médico Nacional Siglo XXI, IMSS Mexico City, Mexico
| | - Miguel A De la Cruz
- Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatria, Centro Médico Nacional Siglo XXI, IMSS Mexico City, Mexico
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Flint A, Stintzi A, Saraiva LM. Oxidative and nitrosative stress defences of Helicobacter and Campylobacter species that counteract mammalian immunity. FEMS Microbiol Rev 2016; 40:938-960. [PMID: 28201757 PMCID: PMC5091033 DOI: 10.1093/femsre/fuw025] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 03/29/2016] [Accepted: 07/02/2016] [Indexed: 12/18/2022] Open
Abstract
Helicobacter and Campylobacter species are Gram-negative microaerophilic host-associated heterotrophic bacteria that invade the digestive tract of humans and animals. Campylobacter jejuni is the major worldwide cause of foodborne gastroenteritis in humans, while Helicobacter pylori is ubiquitous in over half of the world's population causing gastric and duodenal ulcers. The colonisation of the gastrointestinal system by Helicobacter and Campylobacter relies on numerous cellular defences to sense the host environment and respond to adverse conditions, including those imposed by the host immunity. An important antimicrobial tool of the mammalian innate immune system is the generation of harmful oxidative and nitrosative stresses to which pathogens are exposed during phagocytosis. This review summarises the regulators, detoxifying enzymes and subversion mechanisms of Helicobacter and Campylobacter that ultimately promote the successful infection of humans.
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Affiliation(s)
- Annika Flint
- Ottawa Institute of Systems Biology, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada
| | - Alain Stintzi
- Ottawa Institute of Systems Biology, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada
| | - Lígia M. Saraiva
- Instituto de Tecnologia Química e Biológica, NOVA, Av. da República, 2780-157 Oeiras, Portugal
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Singh A, Blaskovic D, Joo J, Yang Z, Jackson SH, Coleman WG, Yan M. Investigating the Role of Helicobacter pylori PriA Protein. Helicobacter 2016; 21:295-304. [PMID: 26817518 PMCID: PMC8483055 DOI: 10.1111/hel.12283] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND In bacteria, PriA protein, a conserved DEXH-type DNA helicase, plays a central role in replication restart at stalled replication forks. Its unique DNA binding property allows it to recognize and stabilize stalled forks and the structures derived from them. PriA plays a very critical role in replication fork stabilization and DNA repair in E. coli and N. gonorrhoeae. In our in vivo expression technology screen, priA gene was induced in vivo when Helicobacter pylori infects mouse stomach. MATERIALS AND METHODS We decided to elucidate the role of H. pylori PriA protein in survival in mouse stomach, survival in gastric epithelial cells and macrophage cells, DNA repair, acid stress, and oxidative stress. RESULTS The priA null mutant strain was unable to colonize mice stomach mucosa after long-term infections. Mouse colonization was observed after 1 week of infection, but the levels were much lower than the wild-type HpSS1 strain. PriA protein was found to be important for intracellular survival of epithelial cell-/macrophage cell-ingested H. pylori. Also, a priA null mutant was more sensitive to DNA-damaging agents and was much more sensitive to acid and oxidative stress as compared to the wild-type strain. CONCLUSIONS These data suggest that the PriA protein is needed for survival and persistence of H. pylori in mice stomach mucosa.
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Affiliation(s)
- Aparna Singh
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Dusan Blaskovic
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Jungsoo Joo
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Zhen Yang
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Sharon H. Jackson
- National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD
| | - William G. Coleman
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD,National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD
| | - Ming Yan
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
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Asakura H, Kawamoto K, Murakami S, Tachibana M, Kurazono H, Makino SI, Yamamoto S, Igimi S. Ex vivo proteomics of Campylobacter jejuni 81-176 reveal that FabG affects fatty acid composition to alter bacterial growth fitness in the chicken gut. Res Microbiol 2015; 167:63-71. [PMID: 26499093 DOI: 10.1016/j.resmic.2015.10.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 09/10/2015] [Accepted: 10/02/2015] [Indexed: 02/07/2023]
Abstract
Campylobacter jejuni is one of the leading causes of foodborne gastrointestinal illness worldwide. Here we performed ex vivo proteomic analysis of C. jejuni 81-176 in chicken, a main reservoir for human infection. At 0, 1 and 4 weeks post-infection (p.i.) with the GFP-expressing 81-176 strain, inocula were recovered from chicken ceca by cell sorting using flow cytometry. iTRAQ-coupled 2D-LC-MS/MS analyses that detected 55 C. jejuni proteins, among which either 3 (FabG, HydB, CJJ81176_0876) or 7 (MscS, CetB, FlhF, PurH, PglJ, LpxC, Icd) proteins exhibited >1.4-fold-increased expression at 1 or 4 week(s) p.i. compared with those at 0 weeks p.i., respectively. Deletion of the fabG gene clearly decreased the proportion of bacterial unsaturated fatty acids (UFAs) and chicken colonization. The UFA proportion of the parental strain was not altered when grown at 42 °C. These findings suggest that FabG might play a pivotal role in UFA production, linked to bacterial adaptation in the poultry host. To our knowledge, this is the first example of ex vivo C. jejuni proteomics, in which fatty acid metabolism might affect bacterial adaptation to the chicken host.
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Affiliation(s)
- Hiroshi Asakura
- Division of Biomedical Food Research, National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya-ku, Tokyo 158-8501, Japan.
| | - Keiko Kawamoto
- Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Inada 2-11, Obihiro, Hokkaido 080-8555, Japan
| | - Satoshi Murakami
- Department of Animal Science, Tokyo University of Agriculture, Funako 1737, Atsugi, Kanagawa 243-0034, Japan
| | - Masato Tachibana
- Division of Biomedical Food Research, National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya-ku, Tokyo 158-8501, Japan
| | - Hisao Kurazono
- Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Inada 2-11, Obihiro, Hokkaido 080-8555, Japan
| | - Sou-Ichi Makino
- Department of Domestic Science, Kyoto Seibo College, Fukakusatayacho 1, Fushimi-ku, Kyoto, Kyoto 612-0878, Japan
| | - Shigeki Yamamoto
- Department of Fisheries, Tokai University, 3-20-1 Orido, Shimizu-ku, Shimizu-shi, Shizuoka 424-8610, Japan
| | - Shizunobu Igimi
- Division of Biomedical Food Research, National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya-ku, Tokyo 158-8501, Japan
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Liu YC, Roujeinikova A. Expression, refolding, purification and crystallization of the sensory domain of the TlpC chemoreceptor from Helicobacter pylori for structural studies. Protein Expr Purif 2014; 107:29-34. [PMID: 25462804 DOI: 10.1016/j.pep.2014.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 11/13/2014] [Accepted: 11/15/2014] [Indexed: 02/07/2023]
Abstract
Helicobacter pylori infections are associated with gastritis, duodenal and gastric ulcers and gastric adenocarcinoma. Bacterial chemotaxis, mediated by four different chemoreceptors (also termed transducer-like proteins (Tlp)), plays an important role in initial colonization and development of disease. Chemoreceptor sensory domains of H. pylori share no significant sequence similarity with those of Escherichia coli or any other non-Epsilonproteobacteria. The structural basis of how chemical signals are recognized by chemoreceptors of H. pylori is poorly understood mainly due to the lack of a robust procedure to purify their sensory domains in a soluble form. This study reports a method for extraction of the periplasmic sensory domain of transducer-like protein C (TlpC) from inclusion bodies and refolding to yield 5mg pure crystallizable protein per 1l of bacterial culture. Purified protein was monomeric in solution by size-exclusion chromatography and folded according to the circular dichroism spectrum. Crystals have been grown by the hanging-drop vapor-diffusion method using PEG 4000 as a precipitating agent. The crystals belonged to space group C2, with unit-cell parameters a=189.3, b=103.2, c=61.8Å, β=98.3. A complete X-ray diffraction data set has been collected to 2.2 Å resolution using cryocooling conditions and synchrotron radiation. Self-rotation function and Matthews coefficient calculations suggest that the asymmetric unit contains three monomers.
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Affiliation(s)
- Yu Chih Liu
- Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Anna Roujeinikova
- Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia; Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia.
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Ntritsou V, Mavrommatis C, Kostoglou C, Dimitriadis G, Tziris N, Zagka P, Vasilakos D. Effect of perioperative electroacupuncture as an adjunctive therapy on postoperative analgesia with tramadol and ketamine in prostatectomy: a randomised sham-controlled single-blind trial. Acupunct Med 2014; 32:215-22. [PMID: 24480836 DOI: 10.1136/acupmed-2013-010498] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVES To study the analgesic effect of electroacupuncture (EA) as perioperative adjunctive therapy added to a systemic analgesic strategy (including tramadol and ketamine) for postoperative pain, opioid-related side effects and patient satisfaction. METHODS In a sham-controlled participant- and observer-blinded trial, 75 patients undergoing radical prostatectomy were randomly assigned to two groups: (1) EA (n=37; tramadol+ketamine+EA) and (2) control (n=38; tramadol+ketamine). EA (100 Hz frequency) was applied at LI4 bilaterally during the closure of the abdominal walls and EA (4 Hz) was applied at ST36 and LI4 bilaterally immediately after extubation. The control group had sham acupuncture without penetration or stimulation. The following outcomes were evaluated: postoperative pain using the Numerical Rating Scale (NRS) and McGill Scale (SF_MPQ), mechanical pain thresholds using algometer application close to the wound, cortisol measurements, rescue analgesia, Spielberger State Trait Anxiety Inventory (STAI Y-6 item), patient satisfaction and opioid side effects. RESULTS Pain scores on the NRS and SF_MPQ were significantly lower and electronic pressure algometer measurements were significantly higher in the EA group than in the control group (p<0.001) at all assessments. In the EA group a significant decrease in rescue analgesia was observed at 45 min (p<0.001) and a significant decrease in cortisol levels was also observed (p<0.05). Patients expressed satisfaction with the analgesia, especially in the EA group (p<0.01). Significant delays in the start of bowel movements were observed in the control group at 45 min (p<0.001) and 2 h (p<0.05). CONCLUSIONS Adding EA perioperatively should be considered an option as part of a multimodal analgesic strategy.
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Affiliation(s)
- Vagia Ntritsou
- Department of Anaesthesiology, General Hospital of Thessaloniki "G. Gennimatas", Thessaloniki, Greece
| | - Christos Mavrommatis
- Department of Rheumatology, General Hospital of Athens "Evaggelismos", Athens, Greece
| | - Christos Kostoglou
- Department of Anaesthesiology, General Hospital of Thessaloniki "G. Gennimatas", Thessaloniki, Greece
| | - Georgios Dimitriadis
- Department of Urology, General Hospital of Thessaloniki "G. Gennimatas", Thessaloniki, Greece
| | - Nikolaos Tziris
- Department of Surgery, University Hospital of Thessaloniki "Ahepa", Thessaloniki, Greece
| | - Poulcheria Zagka
- Department of Biopathology, General Hospital of Thessaloniki "G. Gennimatas", Thessaloniki, Greece
| | - Dimitrios Vasilakos
- Department of Anaesthesiology and Intensive Care, University Hospital of Thessaloniki "Ahepa", Thessaloniki, Greece
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Resistance mechanism to an uncompetitive inhibitor of a single-substrate, single-product enzyme: a study of Helicobacter pylori glutamate racemase. Future Med Chem 2013; 5:1203-14. [DOI: 10.4155/fmc.13.94] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Two independent series of inhibitors of Helicobacter pylori glutamate racemase (MurI) were characterized for their kinetic mechanism, and one was used to generate resistant mutants in vitro. Mutant MurI enzymes from these strains were characterized by structural, genetic, kinetic and biophysical methods. Both inhibitor series, pyrazolopyrimidinediones and benzodiazepines, are uncompetitive with respect to the glutamate substrate, and the resistance mutations were found to act by reducing the affinity of MurI for substrate, thereby reducing the pool of enzyme–substrate complex available for binding inhibitor, while still allowing sufficient glutamate racemase activity for peptidoglycan construction. Uncompetitive inhibitors of a single-substrate, single-product enzyme are rare, and this work gives insight into an remarkable resistance mechanism. This article will discuss the projected clinical impact of H. pylori MurI resistance on these types of inhibitors.
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