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Masset Z, Gunaratnam S, Millette M, McFarland LV, Lacroix M. Environmental and Nutritional Parameters Modulating Genetic Expression for Virulence Factors of Clostridioides difficile. Antibiotics (Basel) 2024; 13:365. [PMID: 38667041 PMCID: PMC11047382 DOI: 10.3390/antibiotics13040365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 04/29/2024] Open
Abstract
Clostridioides difficile infections (CDIs) continue to be a persistent healthcare concern despite newer antibiotic treatments, enhanced infection control practices, and preventive strategies focused on restoring the protective intestinal microbial barrier. Recent strides in gene sequencing research have identified many genes regulating diverse virulence factors for CDIs. These genes may be over- or under-expressed when triggered by various environmental and nutritional factors. The aims of this paper are to review the important genes involved in C. difficile pathogenesis and to identify modifiable environmental, nutritional, and other factors that may trigger the expression of these genes and thus offer new strategies to prevent CDIs.
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Affiliation(s)
- Zoe Masset
- INRS Armand-Frappier Health Biotechnology Research Centre, Research Laboratories in Sciences, 531 des Prairies Blvd, Laval, QC H7V 1B7, Canada; (Z.M.); (M.L.)
| | - Sathursha Gunaratnam
- Bio-K+, a Kerry Company, Preclinical Research Division, 495 Armand-Frappier Blvd, Laval, QC H7V 4B3, Canada; (S.G.); (M.M.)
| | - Mathieu Millette
- Bio-K+, a Kerry Company, Preclinical Research Division, 495 Armand-Frappier Blvd, Laval, QC H7V 4B3, Canada; (S.G.); (M.M.)
| | - Lynne V. McFarland
- Public Health Reserves Corps, Seattle, WA 98115, USA
- McFarland Consulting, Seattle, WA 98115, USA
| | - Monique Lacroix
- INRS Armand-Frappier Health Biotechnology Research Centre, Research Laboratories in Sciences, 531 des Prairies Blvd, Laval, QC H7V 1B7, Canada; (Z.M.); (M.L.)
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2
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Ashok AK, Gnanasekaran TS, Santosh Kumar HS, Srikanth K, Prakash N, Gollapalli P. High-throughput screening and molecular dynamics simulations of natural products targeting LuxS/AI-2 system as a novel antibacterial strategy for antibiotic resistance in Helicobacter pylori. J Biomol Struct Dyn 2024; 42:2913-2928. [PMID: 37160706 DOI: 10.1080/07391102.2023.2210674] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/25/2023] [Indexed: 05/11/2023]
Abstract
The main goal of treating any Helicobacter pylori (H. pylori)-related gastrointestinal disease is completely eradicating infection. Falling eradication efficiency, off-target effects, and patient noncompliance with prolonged and broad spectrums have sparked clinical interest in exploring other effective, safer therapeutic choices. As natural substances are risk-free and privileged with high levels of antibacterial activity, most of these natural chemical's specific modes of action are unknown. With the aid of in silico molecular docking-based virtual screening studies and molecular dynamic simulations, the current study is intended to gather data on numerous such natural chemicals and assess their affinity for the S-ribosyl homocysteine lyase (LuxS) protein of H. pylori. The ligand with the highest binding energy with LuxS, glucoraphanin, catechin gallate and epigallocatechin gallate were rationally selected for further computational analysis. The solution stability of the three compounds' optimal docking postures with LuxS was initially assessed using long-run molecular dynamics simulations. Using molecular dynamics simulation, the epigallocatechin gallate was found to be the most stable molecule with the highest binding free energy, indicating that it might compete with the natural ligand of the inhibitors. According to ADMET analysis, his phytochemical was a promising therapeutic candidate for an antibacterial action since it had a range of physicochemical, pharmacokinetic, and drug-like qualities and had no discernible adverse effects. Additional in vitro, in vivo, and clinical trials are needed to confirm the drug's precise efficacy during H. pylori infection.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Avinash Karkada Ashok
- Department of Biotechnology, Siddaganga Institute of Technology, Tumakuru, Karnataka, India
| | - Tamizh Selvan Gnanasekaran
- Central Research Laboratory, KS Hegde Medical Academy, Nitte (Deemed to be University), Mangalore, Karnataka, India
| | | | - Koigoora Srikanth
- Department of Biotechnology, Vignans Foundation for Science, Research and Technology (Deemed to be University), Guntur, Andhra Pradesh, India
| | - Nayana Prakash
- Department of Biotechnology and Bioinformatics, Jnana Sahyadri campus, Kuvempu University, Shankaraghatta, Karnataka, India
| | - Pavan Gollapalli
- Center for Bioinformatics and Biostatistics, Nitte (Deemed to be University), Mangalore, Karnataka, India
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3
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Tosun MN, Taylan Yalcın G, Korkmazer G, Zorba M, Caner C, Demirel Zorba NN. Disinfection of Clostridioides difficile on spinach with epigallocatechin-based antimicrobial solutions and sodium hypochlorite. Int J Food Microbiol 2023; 402:110301. [PMID: 37364320 DOI: 10.1016/j.ijfoodmicro.2023.110301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 06/15/2023] [Accepted: 06/19/2023] [Indexed: 06/28/2023]
Abstract
The removal of C. difficile inoculated on fresh spinach leaves washed with antimicrobial solutions was investigated. In addition, the effect of washing solutions on the total aerobic mesophilic bacteria (TAMB) and Enterobacteriaceae in the fresh spinach was examined. The fresh spinach was washed through immersion in different concentrations (MIC, 2xMIC, and 4xMIC) of the natural disinfectant solution (NDS) consisting of EDTA, borax, and epigallocatechin gallate (EGCG) content developed in our laboratory and green tea extract-acetic acid (GTE-AA) for varying contact times (5 and 15 min). Different concentrations (50, 100, and 200 ppm) of sodium hypochlorite (NaOCl) and tap water as the control group were used to compare the effectiveness of the NDS. In addition, the effects of washing on the color, texture, and total phenol content of the spinach were determined. No statistical difference was observed in the washing of the spinach leaves with NDS prepared at 2xMIC and 4xMIC concentrations, while inhibition of C. difficile ranged between 2.11 and 2.32 logs. The highest inhibition was observed in the application of 50 ppm NaOCl for 15 min with a decrease of 2.88 logs in C. difficile spores. The GTE-AA and NDS decreased the number of TAMB by 2.27-3.08 log and, 3.21-3.66 log, respectively. Washing spinach leaves with natural disinfectant for 5 min caused a decrease of 2.58 logs in Enterobacteriaceae load, while washing with 50 ppm NaOCl for 15 min reduced Enterobacteriaceae load by 4 logs. Tap water was ineffective in reducing any microbial load. No difference was detected in the color parameters of the spinach through all washes. Although all antimicrobial washes made a difference in the texture of the spinach, the greatest loss in firmness was observed in the spinach washed with NaOCl. Washing spinach with epigallocatechin-based wash solutions can remove C. difficile in possible C. difficile contamination, thereby reducing the environmental load of C. difficile. Epigallocatechin-based disinfectants can be an alternative to chlorine-based disinfectants in improving the microbial quality of vegetables.
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Affiliation(s)
- Melike Nur Tosun
- Canakkale Onsekiz Mart University Engineering Faculty Food Engineering, Canakkale 17020, Turkey
| | - Gizem Taylan Yalcın
- Canakkale Onsekiz Mart University Engineering Faculty Food Engineering, Canakkale 17020, Turkey
| | - Gizem Korkmazer
- Canakkale Onsekiz Mart University Engineering Faculty Food Engineering, Canakkale 17020, Turkey
| | - Murat Zorba
- Canakkale Onsekiz Mart University Engineering Faculty Food Engineering, Canakkale 17020, Turkey
| | - Cengiz Caner
- Canakkale Onsekiz Mart University Engineering Faculty Food Engineering, Canakkale 17020, Turkey
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4
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Hu C, Yang W. Alternatives to animal models to study bacterial infections. Folia Microbiol (Praha) 2023; 68:703-739. [PMID: 37632640 DOI: 10.1007/s12223-023-01084-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 08/02/2023] [Indexed: 08/28/2023]
Abstract
Animal testing has made a significant and unequalled contribution to important discoveries and advancements in the fields of research, medicine, vaccine development, and drug discovery. Each year, millions of animals are sacrificed for various experiments, and this is an ongoing process. However, the debate on the ethical and sensible usage of animals in in vivo experimentation is equally important. The need to explore and adopt newer alternatives to animals so as to comply with the goal of reduce, refine, and replace needs attention. Besides the ever-increasing debate on ethical issues, animal research has additional drawbacks (need of trained labour, requirement of breeding area, lengthy protocols, high expenses, transport barriers, difficulty to extrapolate data from animals to humans, etc.). With this scenario, the present review has been framed to give a comprehensive insight into the possible alternative options worth exploring in this direction especially targeting replacements for animal models of bacterial infections. There have been some excellent reviews discussing on the alternate methods for replacing and reducing animals in drug research. However, reviews that discuss the replacements in the field of medical bacteriology with emphasis on animal bacterial infection models are purely limited. The present review discusses on the use of (a) non-mammalian models and (b) alternative systems such as microfluidic chip-based models and microdosing aiming to give a detailed insight into the prospects of these alternative platforms to reduce the number of animals being used in infection studies. This would enlighten the scientific community working in this direction to be well acquainted with the available new approaches and alternatives so that the 3R strategy can be successfully implemented in the field of antibacterial drug research and testing.
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Affiliation(s)
- Chengming Hu
- Queen Mary College, Nanchang University, Nanchang, China
| | - Wenlong Yang
- Department of Infectious Diseases, The Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China.
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5
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Zhang Y, Mu T, Deng X, Guo R, Xia B, Jiang L, Wu Z, Liu M. New Insights of Biological Functions of Natural Polyphenols in Inflammatory Intestinal Diseases. Int J Mol Sci 2023; 24:ijms24119581. [PMID: 37298531 DOI: 10.3390/ijms24119581] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/17/2023] [Accepted: 05/26/2023] [Indexed: 06/12/2023] Open
Abstract
The intestine is critically crucial for nutrient absorption and host defense against exogenous stimuli. Inflammation-related intestinal diseases, including enteritis, inflammatory bowel disease (IBD), and colorectal cancer (CRC), are heavy burdens for human beings due to their high incidence and devastating clinical symptoms. Current studies have confirmed that inflammatory responses, along with oxidative stress and dysbiosis as critical pathogenesis, are involved in most intestinal diseases. Polyphenols are secondary metabolites derived from plants, which possess convincible anti-oxidative and anti-inflammatory properties, as well as regulation of intestinal microbiome, indicating the potential applications in enterocolitis and CRC. Actually, accumulating studies based on the biological functions of polyphenols have been performed to investigate the functional roles and underlying mechanisms over the last few decades. Based on the mounting evidence of literature, the objective of this review is to outline the current research progress regarding the category, biological functions, and metabolism of polyphenols within the intestine, as well as applications for the prevention and treatment of intestinal diseases, which might provide ever-expanding new insights for the utilization of natural polyphenols.
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Affiliation(s)
- Yunchang Zhang
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
- State Key Laboratory of Animal Nutrition, Department of Animal Nutrition and Feed Science, China Agricultural University, Beijing 100193, China
| | - Tianqi Mu
- State Key Laboratory of Animal Nutrition, Department of Animal Nutrition and Feed Science, China Agricultural University, Beijing 100193, China
| | - Xiong Deng
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Ruiting Guo
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Bing Xia
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Linshu Jiang
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Zhenlong Wu
- State Key Laboratory of Animal Nutrition, Department of Animal Nutrition and Feed Science, China Agricultural University, Beijing 100193, China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China
| | - Ming Liu
- College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
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6
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Hu C, Garey KW. Nonmammalian models to study Clostridioides difficile infection; a systematic review. Anaerobe 2023; 79:102694. [PMID: 36626950 PMCID: PMC9975065 DOI: 10.1016/j.anaerobe.2023.102694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 01/05/2023] [Accepted: 01/06/2023] [Indexed: 01/09/2023]
Abstract
Clostridioide difficile is the leading cause of diarrhea disease worldwide and is a CDC-designated urgent threat level pathogen. Mammalian models are commonly utilized as gold standard to study the pathogenesis of C. difficile infection (CDI); however, alternatives are needed due to cost, higher throughput ability, and mammalian animal ethics. Nonmammalian models such as great wax worm, nematode, fruit fly, and zebrafish have been used as CDI models. This review provides a comprehensive summary of nonmammalian models used to study CDI. Multiple studies were identified using these models to study C. difficile infection, pathogenicity, colonization, host immunity, and therapy. Translational outcomes and strength and weakness of each nonmammalian model are discussed.
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Affiliation(s)
- Chenlin Hu
- University of Houston College of Pharmacy, Houston, TX, 77204, USA
| | - Kevin W Garey
- University of Houston College of Pharmacy, Houston, TX, 77204, USA.
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7
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Wu Z, Shen J, Xu Q, Xiang Q, Chen Y, Lv L, Zheng B, Wang Q, Wang S, Li L. Epigallocatechin-3-Gallate Improves Intestinal Gut Microbiota Homeostasis and Ameliorates Clostridioides difficile Infection. Nutrients 2022; 14:nu14183756. [PMID: 36145133 PMCID: PMC9504111 DOI: 10.3390/nu14183756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/04/2022] [Accepted: 09/08/2022] [Indexed: 11/16/2022] Open
Abstract
Clostridioides difficile infection is closely related to the intestinal flora disorders induced by antibiotics, and changes in the intestinal flora may cause the occurrence and development of Clostridioides difficile infection. Epigallocatechin-3-gallate (EGCG) is one of the major bioactive ingredients of green tea and has been suggested to alleviate the growth of C. difficile in vitro. EGCG can ameliorate several diseases, such as obesity, by regulating the gut microbiota. However, whether EGCG can attenuate C. difficile infection by improving the gut microbiota is unknown. After establishing a mouse model of C. difficile infection, mice were administered EGCG (25 or 50 mg/kg/day) or PBS intragastrically for 2 weeks to assess the benefits of EGCG. Colonic pathology, inflammation, the intestinal barrier, gut microbiota composition, metabolomics, and the transcriptome were evaluated in the different groups. Compared with those of the mice in the CDI group, EGCG improved survival rates after infection, improved inflammatory markers, and restored the damage to the intestinal barrier. Furthermore, EGCG could improve the intestinal microbial community caused by C. difficile infection, such as by reducing the relative abundance of Enterococcaceae and Enterobacteriaceae. Moreover, EGCG can increase short-chain fatty acids, improve amino acid metabolism, and downregulate pathways related to intestinal inflammation. EGCG alters the microbiota and alleviates C. difficile infection, which provides new insights into potential therapies.
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Affiliation(s)
- Zhengjie Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Jian Shen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Qiaomai Xu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Qiangqiang Xiang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Yunbo Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Longxian Lv
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Beiwen Zheng
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Qiangqiang Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Shuting Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
| | - Lanjuan Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Centre for Infectious Diseases, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, 79 Qingchun Rd., Hangzhou 310003, China
- Jinan Microecological Biomedicine Shandong Laboratory, Jinan 250021, China
- Correspondence: ; Tel.: +86-571-8723-6458; Fax: +86-571-8723-6459
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Engevik MA, Engevik AC, Engevik KA, Auchtung JM, Chang-Graham AL, Ruan W, Luna RA, Hyser JM, Spinler JK, Versalovic J. Mucin-Degrading Microbes Release Monosaccharides That Chemoattract Clostridioides difficile and Facilitate Colonization of the Human Intestinal Mucus Layer. ACS Infect Dis 2021; 7:1126-1142. [PMID: 33176423 DOI: 10.1021/acsinfecdis.0c00634] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
It is widely accepted that the pathogen Clostridioides difficile exploits an intestinal environment with an altered microbiota, but the details of these microbe-microbe interactions are unclear. Adherence and colonization of mucus has been demonstrated for several enteric pathogens and it is possible that mucin-associated microbes may be working in concert with C. difficile. We showed that C. difficile ribotype-027 adheres to MUC2 glycans and using fecal bioreactors, we identified that C. difficile associates with several mucin-degrading microbes. C. difficile was found to chemotax toward intestinal mucus and its glycan components, demonstrating that C. difficile senses the mucus layer. Although C. difficile lacks the glycosyl hydrolases required to degrade mucin glycans, coculturing C. difficile with the mucin-degrading Akkermansia muciniphila, Bacteroides thetaiotaomicron, and Ruminococcus torques allowed C. difficile to grow in media that lacked glucose but contained purified MUC2. Collectively, these studies expand our knowledge on how intestinal microbes support C. difficile.
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Affiliation(s)
- Melinda A. Engevik
- Department of Pathology & Immunology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Pathology, Texas Children’s Hospital Houston Texas 77030, United States
| | - Amy C. Engevik
- Department of Surgery, Vanderbilt University School of Medicine, Nashville Tennessee 37232, United States
- Epithelial Biology Center, Vanderbilt University School of Medicine, Nashville Tennessee 37232, United States
| | - Kristen A. Engevik
- Department of Molecular Virology and Microbiology, Baylor College of Medicine Houston Texas 77030, United States
| | - Jennifer M. Auchtung
- Department of Molecular Virology and Microbiology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Food Science and Technology, University of Nebraska—Lincoln, Lincoln Nebraska 68588, United States
| | - Alexandra L. Chang-Graham
- Department of Molecular Virology and Microbiology, Baylor College of Medicine Houston Texas 77030, United States
| | - Wenly Ruan
- Department of Pathology & Immunology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Pathology, Texas Children’s Hospital Houston Texas 77030, United States
| | - Ruth Ann Luna
- Department of Pathology & Immunology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Pathology, Texas Children’s Hospital Houston Texas 77030, United States
| | - Joseph M. Hyser
- Department of Molecular Virology and Microbiology, Baylor College of Medicine Houston Texas 77030, United States
| | - Jennifer K. Spinler
- Department of Pathology & Immunology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Pathology, Texas Children’s Hospital Houston Texas 77030, United States
| | - James Versalovic
- Department of Pathology & Immunology, Baylor College of Medicine Houston Texas 77030, United States
- Department of Pathology, Texas Children’s Hospital Houston Texas 77030, United States
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Regulatory Mechanisms of the LuxS/AI-2 System and Bacterial Resistance. Antimicrob Agents Chemother 2019; 63:AAC.01186-19. [PMID: 31383657 DOI: 10.1128/aac.01186-19] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The quorum-sensing (QS) system is an intercellular cell-cell communication mechanism that controls the expression of genes involved in a variety of cellular processes and that plays critical roles in the adaption and survival of bacteria in their environment. The LuxS/AI-2 QS system, which uses AI-2 (autoinducer-2) as a signal molecule, has been identified in both Gram-negative and Gram-positive bacteria. As one of the important global regulatory networks in bacteria, it responds to fluctuations in the numbers of bacteria and regulates the expression of a number of genes, thus affecting cell behavior. We summarize here the known relationships between the LuxS/AI-2 system and drug resistance, discuss the inhibition of LuxS/AI-2 system as an approach to prevent bacterial resistance, and present new strategies for the treatment of drug-resistant pathogens.
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10
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Yun B, Song M, Park DJ, Oh S. Beneficial Effect of Bifidobacterium longum ATCC 15707 on Survival Rate of Clostridium difficile Infection in Mice. Korean J Food Sci Anim Resour 2017; 37:368-375. [PMID: 28747822 PMCID: PMC5516063 DOI: 10.5851/kosfa.2017.37.3.368] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 04/29/2017] [Accepted: 05/08/2017] [Indexed: 12/28/2022] Open
Abstract
Clostridium difficile infection (CDI) is the main cause of hospital-acquired diarrhea that can cause colitis or even death. The medical-treatment cost and deaths caused by CDI are increasing annually worldwide. New approaches for prevention and treatment of these infections are needed, such as the use of probiotics. Probiotics, including Bifidobacterium spp. and Lactobacillus, are microorganisms that confer a health benefit to the host when administered in adequate amounts. The effect of Bifidobacterium longum ATCC 15707 on infectious disease caused by C. difficile 027 was investigated in a mouse model. The survival rates for mice given the pathogen alone, and with live cells, or dead cells of B. longum were 40, 70, and 60%, respectively. In addition, the intestinal tissues of the B. longum-treated group maintained structural integrity with some degree of damage. These findings suggested that B. longum ATCC 15707 has a function in repressing the infectious disease caused by C. difficile 027.
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Affiliation(s)
- Bohyun Yun
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
| | - Minyu Song
- Animal Products Research and Development Division, National Institute of Animal Science, RDA, Wanju 55365, Korea
| | | | - Sejong Oh
- Division of Animal Science, Chonnam National University, Gwangju 61186, Korea
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11
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Ikarashi N, Ogawa S, Hirobe R, Kon R, Kusunoki Y, Yamashita M, Mizukami N, Kaneko M, Wakui N, Machida Y, Sugiyama K. Epigallocatechin gallate induces a hepatospecific decrease in the CYP3A expression level by altering intestinal flora. Eur J Pharm Sci 2017; 100:211-218. [PMID: 28115221 DOI: 10.1016/j.ejps.2017.01.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 01/10/2017] [Accepted: 01/19/2017] [Indexed: 01/25/2023]
Abstract
In previous studies, we showed that a high-dose intake of green tea polyphenol (GP) induced a hepatospecific decrease in the expression and activity of the drug-metabolizing enzyme cytochrome P450 3A (CYP3A). In this study, we examined whether this decrease in CYP3A expression is induced by epigallocatechin gallate (EGCG), which is the main component of GP. After a diet containing 1.5% EGCG was given to mice, the hepatic CYP3A expression was measured. The level of intestinal bacteria of Clostridium spp., the concentration of lithocholic acid (LCA) in the feces, and the level of the translocation of pregnane X receptor (PXR) to the nucleus in the liver were examined. A decrease in the CYP3A expression level was observed beginning on the second day of the treatment with EGCG. The level of translocation of PXR to the nucleus was significantly lower in the EGCG group. The fecal level of LCA was clearly decreased by the EGCG treatment. The level of intestinal bacteria of Clostridium spp. was also decreased by the EGCG treatment. It is clear that the hepatospecific decrease in the CYP3A expression level observed after a high-dose intake of GP was caused by EGCG. Because EGCG, which is not absorbed from the intestine, causes a decrease in the level of LCA-producing bacteria in the colon, the level of LCA in the liver decreases, resulting in a decrease in the nuclear translocation of PXR, which in turn leads to the observed decrease in the expression level of CYP3A.
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Affiliation(s)
| | - Sosuke Ogawa
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Ryuta Hirobe
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Risako Kon
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Yoshiki Kusunoki
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Marin Yamashita
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Nanaho Mizukami
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Miho Kaneko
- Department of Clinical Pharmacokinetics, Hoshi University, Japan
| | - Nobuyuki Wakui
- Division of Applied Pharmaceutical Education and Research, Hoshi University, Japan
| | - Yoshiaki Machida
- Division of Applied Pharmaceutical Education and Research, Hoshi University, Japan
| | - Kiyoshi Sugiyama
- Department of Clinical Pharmacokinetics, Hoshi University, Japan.
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Kong C, Eng SA, Lim MP, Nathan S. Beyond Traditional Antimicrobials: A Caenorhabditis elegans Model for Discovery of Novel Anti-infectives. Front Microbiol 2016; 7:1956. [PMID: 27994583 PMCID: PMC5133244 DOI: 10.3389/fmicb.2016.01956] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 11/22/2016] [Indexed: 11/13/2022] Open
Abstract
The spread of antibiotic resistance amongst bacterial pathogens has led to an urgent need for new antimicrobial compounds with novel modes of action that minimize the potential for drug resistance. To date, the development of new antimicrobial drugs is still lagging far behind the rising demand, partly owing to the absence of an effective screening platform. Over the last decade, the nematode Caenorhabditis elegans has been incorporated as a whole animal screening platform for antimicrobials. This development is taking advantage of the vast knowledge on worm physiology and how it interacts with bacterial and fungal pathogens. In addition to allowing for in vivo selection of compounds with promising anti-microbial properties, the whole animal C. elegans screening system has also permitted the discovery of novel compounds targeting infection processes that only manifest during the course of pathogen infection of the host. Another advantage of using C. elegans in the search for new antimicrobials is that the worm itself is a source of potential antimicrobial effectors which constitute part of its immune defense response to thwart infections. This has led to the evaluation of effector molecules, particularly antimicrobial proteins and peptides (APPs), as candidates for further development as therapeutic agents. In this review, we provide an overview on use of the C. elegans model for identification of novel anti-infectives. We highlight some highly potential lead compounds obtained from C. elegans-based screens, particularly those that target bacterial virulence or host defense to eradicate infections, a mechanism distinct from the action of conventional antibiotics. We also review the prospect of using C. elegans APPs as an antimicrobial strategy to treat infections.
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Affiliation(s)
- Cin Kong
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia Bangi, Malaysia
| | - Su-Anne Eng
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia Bangi, Malaysia
| | - Mei-Perng Lim
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia Bangi, Malaysia
| | - Sheila Nathan
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia Bangi, Malaysia
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Tea and Recurrent Clostridium difficile Infection. Gastroenterol Res Pract 2016; 2016:4514687. [PMID: 27651790 PMCID: PMC5019912 DOI: 10.1155/2016/4514687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 07/16/2016] [Accepted: 08/10/2016] [Indexed: 02/04/2023] Open
Abstract
Background and Aims. Studies have shown effects of diet on gut microbiota. We aimed to identify foods associated with recurrent Clostridium difficile infection (CDI). Methods. In this cross-sectional survey, consecutive patients diagnosed with CDI were identified by electronic medical records. Colitis symptoms and positive Clostridium difficile assay were confirmed. Health-care onset-health-care facility associated CDI was excluded. Food surveys were mailed to 411 patients. Survey responses served as the primary outcome measure. Spearman's rank correlation identified risk factors for CDI recurrence. Results. Surveys were returned by 68 patients. Nineteen patients experienced CDI recurrence. Compared to patients without CDI recurrence, patients with CDI recurrence had more antibiotics prescribed preceding their infection (p = 0.003). Greater numbers of the latter also listed tea (p = 0.002), coffee (p = 0.013), and eggs (p = 0.013), on their 24-hour food recall. Logistic regression identified tea as the only food risk factor for CDI recurrence (adjusted OR: 5.71; 95% CI: 1.26-25.89). Conclusion. The present results indicate a possible association between tea and CDI recurrence. Additional studies are needed to characterize and confirm this association.
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Wein S, Beyer B, Gohlke A, Blank R, Metges CC, Wolffram S. Systemic Absorption of Catechins after Intraruminal or Intraduodenal Application of a Green Tea Extract in Cows. PLoS One 2016; 11:e0159428. [PMID: 27427946 PMCID: PMC4948893 DOI: 10.1371/journal.pone.0159428] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 07/01/2016] [Indexed: 02/07/2023] Open
Abstract
Green tea catechins have various potential health benefits in humans including anti-inflammatory, anti-oxidative and hepato-protective effects. If present in the circulation, they might have similar effects in ruminants, which are exposed to oxidative stress and fatty liver disease such as dairy cows during the periparturient phase. However, the bioavailability of a substance is a prerequisite for any post absorptive effect in vivo. This study aimed to investigate the appearance of catechins from a green tea extract (GTE) in cattle plasma after intraruminal and intraduodenal administration because absorption is of major importance regarding the bioavailability of catechins. The studies were performed in 5 rumen-fistulated non-lactating heifers and 6 duodenally fistulated lactating dairy cows, respectively, equipped with indwelling catheters placed in a jugular vein. The GTE was applied intraruminally (10 and 50 mg/kg BW, heifers) or duodenally (10, 20 and 30 mg/kg BW, dairy cows) in a cross-over design with a 2 d washout period between different dosages. Blood samples were drawn following the GTE administration at various pre-defined time intervals. The concentration of the major GTE catechins (gallocatechin, epigallocatechin, catechin, epicatechin, epigallocatechin-gallate, epicatechin-gallate) in plasma samples were analysed by HPLC with electrochemical detection. Irrespective of the dose, almost none of the catechins originally contained in the GTE were detected in plasma samples after intraruminal application. In contrast, intraduodenal administration of GTE resulted in increased plasma concentrations of epicatechin, epigallocatechin, epigallocatechin gallate in a dose-dependent manner. Thus, we can conclude that intraruminally or orally administered catechins are intensively metabolized by ruminal microorganisms.
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Affiliation(s)
- Silvia Wein
- Institute of Animal Nutrition & Physiology, Christian-Albrechts-University of Kiel, Kiel, Germany
| | - Birgit Beyer
- Institute of Animal Nutrition & Physiology, Christian-Albrechts-University of Kiel, Kiel, Germany
| | - Annika Gohlke
- Institute of Nutritional Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany
| | - Ralf Blank
- Institute of Animal Nutrition & Physiology, Christian-Albrechts-University of Kiel, Kiel, Germany
| | - Cornelia C. Metges
- Institute of Nutritional Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany
- * E-mail:
| | - Siegfried Wolffram
- Institute of Animal Nutrition & Physiology, Christian-Albrechts-University of Kiel, Kiel, Germany
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Chakrawarti L, Agrawal R, Dang S, Gupta S, Gabrani R. Therapeutic effects of EGCG: a patent review. Expert Opin Ther Pat 2016; 26:907-16. [DOI: 10.1080/13543776.2016.1203419] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Leewanshi Chakrawarti
- Department of Biotechnology, Jaypee Institute of Information technology, Noida, India
| | - Rishab Agrawal
- Department of Biotechnology, Jaypee Institute of Information technology, Noida, India
| | - Shweta Dang
- Department of Biotechnology, Jaypee Institute of Information technology, Noida, India
| | - Sanjay Gupta
- Department of Biotechnology, Jaypee Institute of Information technology, Noida, India
| | - Reema Gabrani
- Department of Biotechnology, Jaypee Institute of Information technology, Noida, India
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Martin-Verstraete I, Peltier J, Dupuy B. The Regulatory Networks That Control Clostridium difficile Toxin Synthesis. Toxins (Basel) 2016; 8:E153. [PMID: 27187475 PMCID: PMC4885068 DOI: 10.3390/toxins8050153] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Revised: 05/03/2016] [Accepted: 05/05/2016] [Indexed: 12/19/2022] Open
Abstract
The pathogenic clostridia cause many human and animal diseases, which typically arise as a consequence of the production of potent exotoxins. Among the enterotoxic clostridia, Clostridium difficile is the main causative agent of nosocomial intestinal infections in adults with a compromised gut microbiota caused by antibiotic treatment. The symptoms of C. difficile infection are essentially caused by the production of two exotoxins: TcdA and TcdB. Moreover, for severe forms of disease, the spectrum of diseases caused by C. difficile has also been correlated to the levels of toxins that are produced during host infection. This observation strengthened the idea that the regulation of toxin synthesis is an important part of C. difficile pathogenesis. This review summarizes our current knowledge about the regulators and sigma factors that have been reported to control toxin gene expression in response to several environmental signals and stresses, including the availability of certain carbon sources and amino acids, or to signaling molecules, such as the autoinducing peptides of quorum sensing systems. The overlapping regulation of key metabolic pathways and toxin synthesis strongly suggests that toxin production is a complex response that is triggered by bacteria in response to particular states of nutrient availability during infection.
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Affiliation(s)
- Isabelle Martin-Verstraete
- Laboratoire Pathogenèse des Bactéries Anaérobes, Department of Microbiology, Institut Pasteur, 25 rue du Dr Roux Paris, Paris 75015, France.
- UFR Sciences du vivant, University Paris Diderot, Sorbonne Paris Cité, Cellule Pasteur, Paris 75015, France.
| | - Johann Peltier
- Laboratoire Pathogenèse des Bactéries Anaérobes, Department of Microbiology, Institut Pasteur, 25 rue du Dr Roux Paris, Paris 75015, France.
| | - Bruno Dupuy
- Laboratoire Pathogenèse des Bactéries Anaérobes, Department of Microbiology, Institut Pasteur, 25 rue du Dr Roux Paris, Paris 75015, France.
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