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Ruma YN, Bu G, Hattne J, Gonen T. MicroED structure of the C11 cysteine protease clostripain. J Struct Biol X 2024; 10:100107. [PMID: 39100863 PMCID: PMC11296011 DOI: 10.1016/j.yjsbx.2024.100107] [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: 01/04/2024] [Revised: 07/03/2024] [Accepted: 07/05/2024] [Indexed: 08/06/2024] Open
Abstract
Clostripain secreted from Clostridium histolyticum is the founding member of the C11 family of Clan CD cysteine peptidases, which is an important group of peptidases secreted by numerous bacteria. Clostripain is an arginine-specific endopeptidase. Because of its efficacy as a cysteine peptidase, it is widely used in laboratory settings. Despite its importance the structure of clostripain remains unsolved. Here we describe the first structure of an active form of C. histolyticum clostripain determined at 2.5 Å resolution using microcrystal electron diffraction (MicroED). The structure was determined from a single nanocrystal after focused ion beam milling. The structure of clostripain shows a typical Clan CD α/β/α sandwich architecture and the Cys231/His176 catalytic dyad in the active site. It has a large electronegative substrate binding pocket showing its ability to accommodate large and diverse substrates. A loop in the heavy chain formed between residues 452 and 457 is potentially important for substrate binding. In conclusion, this result demonstrates the importance of MicroED to determine the unknown structure of macromolecules such as clostripain, which can be further used as a platform to study substrate binding and design of potential inhibitors against this class of peptidases.
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Affiliation(s)
- Yasmeen N. Ruma
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Guanhong Bu
- Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Johan Hattne
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Tamir Gonen
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Physiology, University of California, Los Angeles, Los Angeles, CA 90095, United States
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Wang B, Zhang C, Shi C, Zhai T, Zhu J, Wei D, Shen J, Liu Z, Jia K, Zhao L. Mechanisms of oral microflora in Parkinson's disease. Behav Brain Res 2024; 474:115200. [PMID: 39134178 DOI: 10.1016/j.bbr.2024.115200] [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: 03/28/2024] [Revised: 08/09/2024] [Accepted: 08/09/2024] [Indexed: 08/16/2024]
Abstract
Parkinson's disease (PD) is a common neurodegenerative disease with complex pathogenesis and no effective treatment. Recent studies have shown that dysbiosis of the oral microflora is closely related to the development of PD. The abnormally distributed oral microflora of PD patients cause degenerative damage and necrosis of dopamine neurons by releasing their own components and metabolites, intervening in the oral-gut-brain axis, crossing the biofilm, inducing iron dysregulation, activating inter-microflora interactions, and through the mediation of saliva,ultimately influencing the development of the disease. This article reviews the structure of oral microflora in patients with PD, the mechanism of development of PD caused by oral microflora, and the potential value of targeting oral microflora in developing a new strategy for PD prevention, diagnosis and treatment.
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Affiliation(s)
- Bingbing Wang
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Can Zhang
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Caizhen Shi
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Tianyu Zhai
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Jinghui Zhu
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Dongmin Wei
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Juan Shen
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Zehao Liu
- Medical School of Yan'an University, Yan'an, Shaanxi, China
| | - Kunpeng Jia
- Yan'an University Affiliated Hospital, Yan'an, Shaanxi, China.
| | - Lin Zhao
- Medical School of Yan'an University, Yan'an, Shaanxi, China.
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Jiang Y, Zeng X, Dai H, Luo S, Zhang X. Polygonatum sibiricum polysaccharide regulation of gut microbiota: A viable approach to alleviate cognitive impairment. Int J Biol Macromol 2024; 277:134494. [PMID: 39111476 DOI: 10.1016/j.ijbiomac.2024.134494] [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: 03/19/2024] [Revised: 07/19/2024] [Accepted: 08/02/2024] [Indexed: 08/10/2024]
Abstract
Polygonatum sibiricum has anti-inflammatory effects and is one of the well-known functional foods. Polygonatum sibiricum polysaccharide (PSP), as a traditional medicinal and food homologous substance, can regulate the balance of intestinal flora and short chain fatty acid levels, reduce intestinal permeability and serum endotoxin levels, and inhibit the activation of astrocytes and microglia. It can significantly alleviate neurological diseases and improve cognitive impairment. Current evidence suggests that bidirectional communication between the central nervous system and the gastrointestinal tract may affect the human nervous system, cognition, and behavior through the gut-brain axis. This article provides a systematic review, detailing the biological activity of PSP, and explores the pathogenesis of gut microbiota signaling in cognitive impairment, providing a promising strategy for improving cognitive impairment.
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Affiliation(s)
- Yuhan Jiang
- Department of Food Science and Engineering, Ningbo University, Ningbo 315211, PR China
| | - Xiaoxiong Zeng
- Department of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China.
| | - Haochen Dai
- Department of Food Science and Engineering, Ningbo University, Ningbo 315211, PR China
| | - Songmei Luo
- Department of Pharmacy, Lishui Central Hospital, Lishui 323000, PR China; The Fifth Hospital Affiliated to Wenzhou Medical University, Lishui 323000, PR China.
| | - Xin Zhang
- Department of Food Science and Engineering, Ningbo University, Ningbo 315211, PR China.
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Junyi L, Yueyang W, Bin L, Xiaohong D, Wenhui C, Ning Z, Hong Z. Gut Microbiota Mediates Neuroinflammation in Alzheimer's Disease: Unraveling Key Factors and Mechanistic Insights. Mol Neurobiol 2024:10.1007/s12035-024-04513-w. [PMID: 39317889 DOI: 10.1007/s12035-024-04513-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Accepted: 09/18/2024] [Indexed: 09/26/2024]
Abstract
The gut microbiota, the complex community of microorganisms that inhabit the gastrointestinal tract, has emerged as a key player in the pathogenesis of neurodegenerative disorders, including Alzheimer's disease (AD). AD is characterized by progressive cognitive decline and neuronal loss, associated with the accumulation of amyloid-β plaques, neurofibrillary tangles, and neuroinflammation in the brain. Increasing evidence suggests that alterations in the composition and function of the gut microbiota, known as dysbiosis, may contribute to the development and progression of AD by modulating neuroinflammation, a chronic and maladaptive immune response in the central nervous system. This review aims to comprehensively analyze the current role of the gut microbiota in regulating neuroinflammation and glial cell function in AD. Its objective is to deepen our understanding of the pathogenesis of AD and to discuss the potential advantages and challenges of using gut microbiota modulation as a novel approach for the diagnosis, treatment, and prevention of AD.
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Affiliation(s)
- Liang Junyi
- Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang Province, China
| | - Wang Yueyang
- Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang Province, China
| | - Liu Bin
- Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang Province, China.
| | - Dong Xiaohong
- Jiamusi College, Heilongjiang University of Traditional Chinese Medicine, Jiamusi, Heilongjiang Province, China
| | - Cai Wenhui
- Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang Province, China
| | - Zhang Ning
- Heilongjiang University of Traditional Chinese Medicine, Harbin, 150040, Heilongjiang Province, China
| | - Zhang Hong
- Heilongjiang Jiamusi Central Hospital, Jiamusi, Heilongjiang Province, China
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Tang L, Zhang X, Zhang B, Chen T, Du Z, Song W, Chen W, Wang C. Electroacupuncture remodels gut microbiota and metabolites in mice with perioperative neurocognitive impairment. Exp Gerontol 2024; 194:112507. [PMID: 38971546 DOI: 10.1016/j.exger.2024.112507] [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: 04/21/2024] [Revised: 06/13/2024] [Accepted: 06/30/2024] [Indexed: 07/08/2024]
Abstract
Gut microbiota and metabolites are considered key factors in the pathogenesis of perioperative neurocognitive disorders (PND), and the brain-gut axis may be a promising target for PND treatment. Electroacupuncture has been shown to improve a wide range of neurological disorders and to restore function to the gastrointestinal tract. Thus, we hypothesized whether electroacupuncture could remodel gut microbiota and neuroinflammation induced by anesthesia/surgery. First, we observed electroacupuncture at acupoints GV20, LI4 and PC6 significantly improved memory in behavioral tests. Next, we found electroacupuncture decreased the levels of inflammatory factors (NSE, S-100β, IL-6, etc.) in the hippocampus, indicating that nerve inflammation was blocked by electroacupuncture. Furthermore, via 16S rRNA sequence analysis and LC-MS analysis, the gut microbiota and its metabolites were appropriately restored after electroacupuncture treatment. Additionally, we further confirmed the restorative effect of electroacupuncture on PND by fecal transplantation. In conclusion, the role of electroacupuncture in improving cognitive function and protecting neurons may be related to the modulation of gut microbiota and their metabolite dysregulation, thereby inhibiting neuroinflammation in PND mice.
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Affiliation(s)
- Lu Tang
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China; Key Laboratory of Gansu Provincial Prescription Mining and Innovative Translational Laboratory, Lanzhou 730030, China; Gansu Provincial Traditional Chinese Medicine New Product Creation Engineering Laboratory, Lanzhou 730030, China
| | - Xiaojia Zhang
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China; Key Laboratory of Gansu Provincial Prescription Mining and Innovative Translational Laboratory, Lanzhou 730030, China; Gansu Provincial Traditional Chinese Medicine New Product Creation Engineering Laboratory, Lanzhou 730030, China
| | - Binsen Zhang
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China; Key Laboratory of Gansu Provincial Prescription Mining and Innovative Translational Laboratory, Lanzhou 730030, China; Gansu Provincial Traditional Chinese Medicine New Product Creation Engineering Laboratory, Lanzhou 730030, China
| | - Tianren Chen
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China
| | - Zhongying Du
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China; Key Laboratory of Gansu Provincial Prescription Mining and Innovative Translational Laboratory, Lanzhou 730030, China; Gansu Provincial Traditional Chinese Medicine New Product Creation Engineering Laboratory, Lanzhou 730030, China
| | - Wenjing Song
- The Fifth Clinical College, Chongqing Medical University, Chongqing 400015, China
| | - Wenqiang Chen
- The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou 730030, China
| | - Chunai Wang
- Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou 730050, China; Clinical Medical Research Centre for Integrated Chinese and Western Medicine in Anesthesia of Gansu Provincial, Lanzhou 730050, China.
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Yin C, Zhang M, Jin S, Zhou Y, Ding L, Lv Q, Huang Z, Zhou J, Chen J, Wang P, Zhang S, You Q. Mechanism of Salvia miltiorrhiza Bunge extract to alleviate Chronic Sleep Deprivation-Induced cognitive dysfunction in rats. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 130:155725. [PMID: 38772181 DOI: 10.1016/j.phymed.2024.155725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 03/16/2024] [Accepted: 05/07/2024] [Indexed: 05/23/2024]
Abstract
BACKGROUND Bidirectional communication between the gut microbiota and the brain may play an essential role in the cognitive dysfunction associated with chronic sleep deprivation(CSD). Salvia miltiorrhiza Bunge (Danshen, DS), a famous Chinese medicine and functional tea, is extensively used to protect learning and memory capacities, although the mechanism of action remains unknown. PURPOSE The purpose of this research was to explore the efficacy and the underlying mechanism of DS in cognitive dysfunction caused by CSD. METHODS DS chemical composition was analyzed by UPLC-QTOF-MS/MS. Forty rats were randomly assigned to five groups (n = 8): control (CON), model (MOD), low- (1.35 g/kg, DSL), high-dose (2.70 g/kg, DSH) DS group, and Melatonin(100 mg/kg, MT) group. A CSD rat model was established over 21 days. DS's effects and the underlying mechanism were explored using the open-field test(OFT), Morris water-maze(MWM), tissue staining(Hematoxylin and Eosin Staining, Nissl staining, Alcian blue-periodic acid SCHIFF staining, and Immunofluorescence), enzyme-linked immunosorbent assay, Western blot, quantitative real-time polymerase chain reaction(qPCR), and 16S rRNA sequencing. RESULTS We demonstrated that CSD caused gut dysbiosis and cognitive dysfunction. Furthermore, 16S rRNA sequencing demonstrated that Firmicutes and Proteobacteria were more in fecal samples from model group rats, whereas Bacteroidota and Spirochaetota were less. DS therapy, on the contrary hand, greatly restored the gut microbial community, consequently alleviating cognitive impairment in rats. Further research revealed that DS administration reduced systemic inflammation via lowering intestinal inflammation and barrier disruption. Following that, DS therapy reduced Blood Brain Barrier(BBB) and neuronal damage, further decreasing neuroinflammation in the hippocampus(HP). Mechanistic studies revealed that DS therapy lowered lipopolysaccharide (LPS) levels in the HP, serum, and colon, consequently blocking the TLR4/MyD88/NF-κB signaling pathway and its downstream pro-inflammatory products(IL-1β, IL-6, TNF-α, iNOS, and COX2) in the HP and colon. CONCLUSION DS treatment dramatically improved spatial learning and memory impairments in rats with CSD by regulating the composition of the intestinal flora, preserving gut and brain barrier function, and reducing inflammation mediated by the LPS-TLR4 signaling pathway. Our findings provide novel insight into the mechanisms by which DS treats cognitive dysfunction caused by CSD.
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Affiliation(s)
- Chao Yin
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Engineering Research Center of TCM Protection Technology and New Product Development for the Elderly Brain Health, Ministry of Education, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Hubei Shizhen Laboratory, Wuhan 430065, PR China
| | - Meiya Zhang
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Engineering Research Center of TCM Protection Technology and New Product Development for the Elderly Brain Health, Ministry of Education, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Hubei Shizhen Laboratory, Wuhan 430065, PR China
| | - Shuna Jin
- Hubei Shizhen Laboratory, Wuhan 430065, PR China; School of Basic Medical Sciences, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Yuan Zhou
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Li Ding
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Engineering Research Center of TCM Protection Technology and New Product Development for the Elderly Brain Health, Ministry of Education, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Hubei Shizhen Laboratory, Wuhan 430065, PR China
| | - Qing Lv
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Zixuan Huang
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Jiaqi Zhou
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Jianmei Chen
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China
| | - Ping Wang
- Engineering Research Center of TCM Protection Technology and New Product Development for the Elderly Brain Health, Ministry of Education, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Hubei Shizhen Laboratory, Wuhan 430065, PR China.
| | - Shunbo Zhang
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China.
| | - Qiuyun You
- School of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Engineering Research Center of TCM Protection Technology and New Product Development for the Elderly Brain Health, Ministry of Education, Hubei University of Chinese Medicine, Wuhan 430065, PR China; Hubei Shizhen Laboratory, Wuhan 430065, PR China.
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Lee J, Menon N, Lim CT. Dissecting Gut-Microbial Community Interactions using a Gut Microbiome-on-a-Chip. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2302113. [PMID: 38414327 PMCID: PMC11132043 DOI: 10.1002/advs.202302113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 07/21/2023] [Indexed: 02/29/2024]
Abstract
While the human gut microbiota has a significant impact on gut health and disease, understanding of the roles of gut microbes, interactions, and collective impact of gut microbes on various aspects of human gut health is limited by the lack of suitable in vitro model system that can accurately replicate gut-like environment and enable the close visualization on causal and mechanistic relationships between microbial constitutents and the gut. , In this study, we present a scalable Gut Microbiome-on-a-Chip (GMoC) with great imaging capability and scalability, providing a physiologically relevant dynamic gut-microbes interfaces. This chip features a reproducible 3D stratified gut epithelium derived from Caco-2 cells (µGut), mimicking key intestinal architecture, functions, and cellular complexity, providing a physiolocially relevant gut environment for microbes residing in the gut. Incorporating tumorigenic bacteria, enterotoxigenic Bacteroides fragilis (ETBF), into the GMoC enable the observation of pathogenic behaviors of ETBF, leading to µGut disruption and pro-tumorigenic signaling activations. Pre-treating the µGut with a beneficial gut microbe Lactobacillus spp., effectively prevent ETBF-mediated gut pathogenesis, preserving the healthy state of the µGut through competition-mediated colonization resistance. The GMoC holds potential as a valuable tool for exploring unknown roles of gut microbes in microbe-induced pathogenesis and microbe-based therapeutic development.
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Affiliation(s)
- Jeeyeon Lee
- Institute for Health Innovation and Technology (iHealthtech)National University of SingaporeSingapore117599Singapore
| | - Nishanth Menon
- Department of Biomedical EngineeringNational University of SingaporeSingapore117583Singapore
| | - Chwee Teck Lim
- Institute for Health Innovation and Technology (iHealthtech)National University of SingaporeSingapore117599Singapore
- Department of Biomedical EngineeringNational University of SingaporeSingapore117583Singapore
- Mechanobiology InstituteNational University of SingaporeSingapore117411Singapore
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Hoisington AJ, Stearns-Yoder KA, Stamper CE, Simonetti JA, Oslin DW, Brenner LA. Longitudinal Influence of Prescribed Antidepressants on Fecal and Oral Microbiomes Among Veterans With Major Depressive Disorder. J Neuropsychiatry Clin Neurosci 2024; 36:151-159. [PMID: 38258376 PMCID: PMC11420931 DOI: 10.1176/appi.neuropsych.20220221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
OBJECTIVE The purpose of this study was to evaluate the influence of a new course of antidepressant monotherapy on gut and oral microbiomes and the relationship to depressive symptoms. METHODS Longitudinal microbiome samples obtained from 10 U.S. veterans were analyzed. Baseline samples were taken before a new course of antidepressant monotherapy (either switching from a previous treatment or starting a new treatment). Targeted genomic sequencing of the microbiome samples was used to analyze changes in taxonomy and diversity across participants, medications, and medication class. Associations between these changes and Patient Health Questionnaire-9 (PHQ-9) scores were analyzed. RESULTS Taxonomic variability was observed across participants, with the individual being the main microbial community driver. In terms of the fecal microbiome, antidepressants were associated with shifts toward Bacteroides being less abundant and Blautia, Pseudomonas, or Faecalibacterium being more abundant. Likewise, the composition of the oral microbiome was variable, with individual participants being the primary drivers of community composition. In the oral samples, the relative abundance of Haemophilus decreased after antidepressants were started. Increases in Blautia and decreases in Bacteroides were associated with lower PHQ-9 scores. CONCLUSIONS Antidepressants were found to influence fecal and oral microbiomes such that a new course of antidepressant monotherapy was associated with taxonomic alterations toward healthier states in both fecal and oral microbiomes, which were associated with decreases in depressive symptoms. Additional longitudinal research is required to increase understanding of microbiomes and symptom-based changes, with a particular focus on potential differences between medication classes and underlying mechanisms.
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Affiliation(s)
- Andrew J Hoisington
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
| | - Kelly A Stearns-Yoder
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
| | - Christopher E Stamper
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
| | - Joseph A Simonetti
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
| | - David W Oslin
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
| | - Lisa A Brenner
- Veterans Affairs Rocky Mountain Mental Illness Research, Education, and Clinical Center (MIRECC), Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Simonetti, Brenner); Military and Veteran Microbiome Consortium for Research and Education, Aurora, Colo. (Hoisington, Stearns-Yoder, Stamper, Brenner); Department of Physical Medicine and Rehabilitation (Hoisington, Stearns-Yoder, Stamper, Brenner), Division of Hospital Medicine, Department of Medicine (Simonetti), and Departments of Psychiatry and Neurology (Brenner), University of Colorado Anschutz Medical Campus, Aurora, Colo.; Department of Systems Engineering and Management, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio (Hoisington); Veterans Integrated Services Network 4 MIRECC, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia (Oslin); Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia (Oslin)
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Ruma YN, Bu G, Gonen T. MicroED structure of the C11 cysteine protease Clostripain. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.04.574240. [PMID: 38260293 PMCID: PMC10802345 DOI: 10.1101/2024.01.04.574240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Clostripain secreted from Clostridium histolyticum is the founding member of the C11 family of Clan CD cysteine peptidases, which is an important group of peptidases secreted by numerous bacteria. Clostripain is an arginine specific endopeptidase. Because of its efficacy as a cysteine peptidase, it is widely used in laboratory settings. Despite its importance the structure of clostripain remains unsolved. Here we describe the first structure of an active form of C. histolyticum Clostripain determined at 3.6 Å resolution using microcrystal electron diffraction (MicroED). The structure was determined from a single nanocrystal after focused ion beam milling. The structure of Clostripain shows a typical Clan CD α/β/α sandwich architecture and the Cys231/His176 catalytic dyad in the active site. It has a large electronegative substrate binding pocket showing its ability to accommodate large and diverse substrates. A loop in the heavy chain formed between residues 452 to 457 is potentially important for substrate binding. In conclusion, this result demonstrates the importance of MicroED to determine the unknown structure of macromolecules such as Clostripain, which can be further used as a platform to study substrate binding and design of potential inhibitors against this class of peptidases.
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Patil RS, Tupe RS. Communal interaction of glycation and gut microbes in diabetes mellitus, Alzheimer's disease, and Parkinson's disease pathogenesis. Med Res Rev 2024; 44:365-405. [PMID: 37589449 DOI: 10.1002/med.21987] [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: 09/23/2022] [Revised: 07/12/2023] [Accepted: 08/06/2023] [Indexed: 08/18/2023]
Abstract
Diabetes and its complications, Alzheimer's disease (AD), and Parkinson's disease (PD) are increasing gradually, reflecting a global threat vis-à-vis expressing the essentiality of a substantial paradigm shift in research and remedial actions. Protein glycation is influenced by several factors, like time, temperature, pH, metal ions, and the half-life of the protein. Surprisingly, most proteins associated with metabolic and neurodegenerative disorders are generally long-lived and hence susceptible to glycation. Remarkably, proteins linked with diabetes, AD, and PD share this characteristic. This modulates protein's structure, aggregation tendency, and toxicity, highlighting renovated attention. Gut microbes and microbial metabolites marked their importance in human health and diseases. Though many scientific shreds of evidence are proposed for possible change and dysbiosis in gut flora in these diseases, very little is known about the mechanisms. Screening and unfolding their functionality in metabolic and neurodegenerative disorders is essential in hunting the gut treasure. Therefore, it is imperative to evaluate the role of glycation as a common link in diabetes and neurodegenerative diseases, which helps to clarify if modulation of nonenzymatic glycation may act as a beneficial therapeutic strategy and gut microbes/metabolites may answer some of the crucial questions. This review briefly emphasizes the common functional attributes of glycation and gut microbes, the possible linkages, and discusses current treatment options and therapeutic challenges.
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Affiliation(s)
- Rahul Shivaji Patil
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Rashmi Santosh Tupe
- Symbiosis School of Biological Sciences (SSBS), Symbiosis International (Deemed University) (SIU), Pune, Maharashtra, India
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11
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Hill CA, Casterline BW, Valguarnera E, Hecht AL, Shepherd ES, Sonnenburg JL, Bubeck Wardenburg J. Bacteroides fragilis toxin expression enables lamina propria niche acquisition in the developing mouse gut. Nat Microbiol 2024; 9:85-94. [PMID: 38168616 PMCID: PMC11214347 DOI: 10.1038/s41564-023-01559-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 11/14/2023] [Indexed: 01/05/2024]
Abstract
Bacterial toxins are well-studied virulence factors; however, recent studies have revealed their importance in bacterial niche adaptation. Enterotoxigenic Bacteroides fragilis (ETBF) expresses B. fragilis toxin (BFT) that we hypothesized may contribute to both colonic epithelial injury and niche acquisition. We developed a vertical transmission model for ETBF in mice that showed that BFT enabled ETBF to access a lamina propria (LP) niche during colonic microbiome development that was inaccessible to non-toxigenic B. fragilis. LP entry by ETBF required BFT metalloprotease activity, and showed temporal restriction to the pre-weaning period, dependent on goblet-cell-associated passages. In situ single-cell analysis showed bft expression at the apical epithelial surface and within the LP. BFT expression increased goblet cell number and goblet-cell-associated passage formation. These findings define a paradigm by which bacterial toxin expression specifies developmental niche acquisition, suggesting that a selective advantage conferred by a toxin may impact long-term host health.
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Affiliation(s)
- Craig A Hill
- Department of Pediatrics, Washington University, St. Louis, MO, USA
| | - Benjamin W Casterline
- Interdisciplinary Scientist Training Program, University of Chicago, Chicago, IL, USA
- Department of Dermatology, University of Missouri School of Medicine, Columbia, MO, USA
| | | | - Aaron L Hecht
- Interdisciplinary Scientist Training Program, University of Chicago, Chicago, IL, USA
- Division of Gastroenterology and Hepatology, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | | | - Justin L Sonnenburg
- Department of Microbiology and Immunology, Stanford University, Palo Alto, CA, USA
- Chan Zuckerberg Biohub, San Francisco, CA, USA
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12
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Peng Y, Zeng Y, Zheng T, Xie X, Wu J, Fu L, Lu F, Zhang L, Chen Y, Liu X, Wang L. Effects of Tiaopi Xiezhuo decoction on constipation and gut dysbiosis in patients with peritoneal dialysis. PHARMACEUTICAL BIOLOGY 2023; 61:531-540. [PMID: 36994999 PMCID: PMC10064829 DOI: 10.1080/13880209.2023.2193595] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 01/24/2023] [Accepted: 03/12/2023] [Indexed: 06/10/2023]
Abstract
CONTEXT A Chinese herbal formula, Tiaopi Xiezhuo decoction (TXD), is developed from a classical Chinese prescription Sanhuang Xiexin decoction. OBJECTIVE To investigate the regulatory effect of TXD on gut dysbiosis, as a treatment of constipation in patients with peritoneal dialysis (PD). MATERIALS AND METHODS The chemical content of TXD was assessed by high-performance liquid chromatography. A total of 29 PD patients were enrolled and treated with TXD orally (3 g crude drug/each/twice/day) for 3 months. Blood and faecal samples were collected at the beginning and end, to determine the changes in biochemical characteristics and gut microbial composition. The stool conditions were asked to be scored. Additional 30 healthy individuals were recruited as a control for the analysis of gut microbiota. RESULTS Although having no significant effects on serum biochemical characteristics, 3-month TXD intervention improved constipation in PD patients: decreased 80% abdominal distention (p < 0.01), increased 2.6-fold sloppy stools (p < 0.05) and eliminated hard stool completely (p < 0.01). The analysis of gut microbiota showed that, compared to the healthy group, the microbial richness was reduced in PD patients. After a 3-month TXD treatment, this reduced richness was raised, and Paraprevotella clara, Lachnospiraceae bacterium 2-146FA, Phascolarctobaterium succinatutens, Lachnospiraceae bacterium 2-1-58FAA, Fusobacterium mortiferum, and Prevotella copri were accumulated in the intestinal flora. Furthermore, the bacterial species enriched by TXD correlated with the improvement of constipation. DISCUSSION AND CONCLUSIONS TXD treatment may improve constipation by modulating gut dysbiosis in PD patients. These findings provide data to support the further application of TXD in the adjuvant treatment of PD.
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Affiliation(s)
- Yu Peng
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Yuting Zeng
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Tingting Zheng
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Xiaoning Xie
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Jianfeng Wu
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Lizhe Fu
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Fuhua Lu
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - La Zhang
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Yang Chen
- Guangdong Provincial Key Laboratory of Clinical Research on Traditional Chinese Medicine Syndrome, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Xusheng Liu
- Department of Nephrology, Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
| | - Lei Wang
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, P.R. China
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13
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Hoffman K, Brownell Z, Doyle WJ, Ochoa-Repáraz J. The immunomodulatory roles of the gut microbiome in autoimmune diseases of the central nervous system: Multiple sclerosis as a model. J Autoimmun 2023; 137:102957. [PMID: 36435700 PMCID: PMC10203067 DOI: 10.1016/j.jaut.2022.102957] [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: 11/10/2022] [Accepted: 11/14/2022] [Indexed: 11/24/2022]
Abstract
The gut-associated lymphoid tissue is a primary activation site for immune responses to infection and immunomodulation. Experimental evidence using animal disease models suggests that specific gut microbes significantly regulate inflammation and immunoregulatory pathways. Furthermore, recent clinical findings indicate that gut microbes' composition, collectively named gut microbiota, is altered under disease state. This review focuses on the functional mechanisms by which gut microbes promote immunomodulatory responses that could be relevant in balancing inflammation associated with autoimmunity in the central nervous system. We also propose therapeutic interventions that target the composition of the gut microbiota as immunomodulatory mechanisms to control neuroinflammation.
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Affiliation(s)
- Kristina Hoffman
- Department of Biological Sciences, Boise State University, Boise, ID, 83725, USA
| | - Zackariah Brownell
- Department of Biological Sciences, Arizona State University, Tempe, AZ, 85281, USA
| | - William J Doyle
- Department of Biological Sciences, Boise State University, Boise, ID, 83725, USA
| | - Javier Ochoa-Repáraz
- Department of Biological Sciences, Boise State University, Boise, ID, 83725, USA.
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Niu G, Jian T, Gai Y, Chen J. Microbiota and plant-derived vesicles that serve as therapeutic agents and delivery carriers to regulate metabolic syndrome. Adv Drug Deliv Rev 2023; 196:114774. [PMID: 36906231 DOI: 10.1016/j.addr.2023.114774] [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: 09/30/2022] [Revised: 03/02/2023] [Accepted: 03/05/2023] [Indexed: 03/13/2023]
Abstract
The gut is a fundamental organ in controlling human health. Recently, researches showed that substances in the intestine can alter the course of many diseases through the intestinal epithelium, especially intestinal flora and exogenously ingested plant vesicles that can be transported over long distances to various organs. This article reviews the current knowledge on extracellular vesicles in modulating gut homeostasis, inflammatory response and numerous metabolic disease that share obesity as a co-morbidity. These complex systemic diseases that are difficult to cure, but can be managed by some bacterial and plant vesicles. Vesicles, due to their digestive stability and modifiable properties, have emerged as novel and targeted drug delivery vehicles for effective treatment of metabolic diseases.
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Affiliation(s)
- Guanting Niu
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
| | - Tunyu Jian
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
| | - Yanan Gai
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
| | - Jian Chen
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China.
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15
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Guo Y, Ouyang Z, He W, Zhang J, Qin Q, Jiao M, Muyldermans S, Zheng F, Wen Y. Screening and epitope characterization of diagnostic nanobody against total and activated Bacteroides fragilis toxin. Front Immunol 2023; 14:1065274. [PMID: 36845160 PMCID: PMC9950733 DOI: 10.3389/fimmu.2023.1065274] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 01/19/2023] [Indexed: 02/12/2023] Open
Abstract
Enterotoxigenic Bacteroides fragilis (ETBF) can rapidly secrete an enterotoxin termed B. fragilis toxin (BFT), which is thought to be the only recognized virulence factor in ETBF. ETBF can cause acute diarrhea, inflammatory bowel disease (IBD), colorectal cancer, and breast cancer. BFT is divided into three subtypes, BFT1, BFT2, and BFT3. BFT1 is the most widely distributed in human B. fragilis isolates. BFT can be used as a biomarker for predicting the inflammation-cancer transformation of intestine and breast. Nanobodies have the advantages of small structure, complete antigen recognition capacity, rapid selection via phage display technology, and can be massively produced in microbial expression systems. Nanobodies have become a powerful tool for medical diagnosis and treatment. This study focuses on screening and structural characterization of nanobodies targeting full length and active BFT. By constructing prokaryotic expression systems to obtain recombinant BFT1 protein, high purity BFT1 protein was used to immunize alpacas. Phage display technology was used to construct a phage display library. The positive clones were selected by bio-panning, and the isothermal titration calorimetry was used to select high-affinity nanobodies. Then the three-dimensional structures of BFT1:Nb2.82 and BFT1:Nb3.27 were solved by crystal X-ray diffraction. We got two kinds of nanobodies, Nb2.82 targeting the BFT1 prodomain and Nb3.27 recognizing the BFT1 catalytic domain. This study provides a new strategy for the early diagnosis of ETBF and the possibility for BFT as a biomarker for diagnosing diseases.
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Affiliation(s)
- Yucheng Guo
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Zhenlin Ouyang
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Wenbo He
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Jiaxin Zhang
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Qian Qin
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Min Jiao
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Serge Muyldermans
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Fang Zheng
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China,*Correspondence: Yurong Wen, ; Fang Zheng,
| | - Yurong Wen
- Center for Microbiome Research of Med-X Institute, The Key Laboratory of Environment and Genes Related to Disease of Ministry of Education, The First Affiliated Hospital, Xi’an Jiaotong University, Xi’an, China,*Correspondence: Yurong Wen, ; Fang Zheng,
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16
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Li Y, Luo B, Tong B, Xie Z, Cao J, Bai X, Peng Y, Wu Y, Wang W, Qi X. The role and molecular mechanism of gut microbiota in Graves' orbitopathy. J Endocrinol Invest 2023; 46:305-317. [PMID: 35986869 DOI: 10.1007/s40618-022-01902-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 08/10/2022] [Indexed: 01/25/2023]
Abstract
PURPOSE Graves' orbitopathy (GO) is an autoimmune orbital disorder. Gut microbiota dysfunction plays a vital role in autoimmune diseases, including Graves' disease (GD) and GO. In the present study, we aimed to investigate the change of gut microbiota in GD/GO using mouse model. METHODS The murine model of GD/GO was established by the challenge of adenovirus expressing thyroid-stimulating hormone (TSH) receptor (TSHR) (Ad-TSHR). The histological changes of orbital and thyroid tissues were analyzed by hematoxylin and eosin (H&E), Masson staining, and immunohistochemistry (IHC) staining. The fecal samples were collected for 16S rRNA gene sequencing and bioinformatics analysis. RESULTS The GD/GO model was established successfully, as manifested as the broadened eyelid, exophthalmia and conjunctive redness, severe inflammatory infiltration among thyroid glands and between extraocular muscle space, hypertrophic extraocular muscles, elevated thyroxine (T4) and decreased TSH, and positive CD34, CD40, collagen I, and α-SMA staining. A total of 222 operational taxonomic units (OUTs) were overlapped between mice in the Ad-NC and Ad-TSHR groups. The microbial composition of the samples in the two groups was mainly Bacteroidia and Clostridia, and the Ad-NC group had a significantly lower content of Bacteroidia and higher content of Clostridia. KEGG orthology analysis results revealed differences in dehydrogenase, aspartic acid, bile acid, chalcone synthase, acetyltransferase, glutamylcyclotransferase, glycogenin, and 1-phosphatidylinositol-4-phosphate 5-kinase between two groups; enzyme commission (EC) analysis results revealed differences in several dehydrogenase, oxidase, thioxy/reductase between two groups; MetaCyc pathways analysis results revealed differences in isoleucine degradation, oxidation of C1 compounds, tricarboxylic acid (TCA) cycle IV, taurine degradation, and biosynthesis of paromamine, heme, colonic acid building blocks, butanediol, lysine/threonine/methionine, and histidine/purine/pyrimidine between two groups. CONCLUSION This study induced a mouse model of GD/GO by Ad-TSHR challenge, and gut microbiota characteristics were identified in the GD/GO mice. The Bacteroidia and Clostridia abundance was changed in the GD/GO mice. These findings may lay a solid experimental foundation for developing personalized treatment regimens for GD patients according to the individual gut microbiota. Given the potential impact of regional differences on intestinal microbiota, this study in China may provide a reference for the global overview of the gut-thyroid axis hypothesis.
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Affiliation(s)
- Y Li
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - B Luo
- Department of Ophthalmology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - B Tong
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Z Xie
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - J Cao
- Department of Ophthalmology, The Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, China
| | - X Bai
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Y Peng
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Y Wu
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China
| | - W Wang
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, 410000, Hunan, China
| | - X Qi
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, 410011, Hunan, China.
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17
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Liu X, Zhou M, Dai Z, Luo S, Shi Y, He Z, Chen Y. Salidroside alleviates ulcerative colitis via inhibiting macrophage pyroptosis and repairing the dysbacteriosis-associated Th17/Treg imbalance. Phytother Res 2023; 37:367-382. [PMID: 36331009 DOI: 10.1002/ptr.7636] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/03/2022] [Accepted: 09/14/2022] [Indexed: 11/06/2022]
Abstract
Ulcerative colitis (UC) is a chronic inflammatory bowel disease characterized by flora disequilibrium and mucosal immunity disorder. Here, we report that salidroside effectively restricts experimental colitis from two aspects of intestinal macrophage pyroptosis and dysbacteriosis-derived colonic Th17/Treg imbalance. In innate immunity, the upregulated TREM1 and pyroptosis-related proteins in inflamed colons were inhibited by salidroside administration and further experiments in vitro showed that salidroside suppressed LPS/ATP-induced bone marrow-derived macrophages (BMDMs) pyroptosis evident by the decline of LDH and IL-1β release as well as the protein level of NLRP3, caspase-1, and GSDMD p30. Moreover, the TREM1 inhibitor weakened the effect of salidroside on BMDMs pyroptosis, whereas salidroside still could downregulate TREM1 when NLRP3 was inhibited. In adaptive immunity, salidroside improved the gut microflora diversity and Th17/Treg ratio in DSS-induced mice, especially promoting the abundance of Firmicutes. Clearance of the gut flora blocked the benefit of salidroside on colonic inflammation and Th17/Treg adaptive immunity, but transplanting salidroside-treated foecal bacterium into flora-depleted wild mice reproduced the resistance of salidroside to gut inflammation. Taken together, our data demonstrated that salidroside protected experimental colitis via skewing macrophage pyroptosis and Th17/Treg balance, indicating its potential effect on UC and other immune disorders.
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Affiliation(s)
- Xiaoman Liu
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai, China
| | - Mingxia Zhou
- Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai, China
| | - Zhenzhen Dai
- Shanghai Institute for Pediatric Research, Shanghai, China
| | - Shangjian Luo
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai, China
| | - Yingying Shi
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Shanghai, China
| | - Zhenjuan He
- Department of Neonatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yingwei Chen
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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18
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Gautier T, Olivieiro N, Ferron S, Le Pogam P, David-Le Gall S, Sauvager A, Leroyer P, Cannie I, Dion S, Sweidan A, Loréal O, Tomasi S, Bousarghin L. Bacteroides fragilis derived metabolites, identified by molecular networking, decrease Salmonella virulence in mice model. Front Microbiol 2022; 13:1023315. [DOI: 10.3389/fmicb.2022.1023315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/26/2022] [Indexed: 11/12/2022] Open
Abstract
In the gut microbiota, resident bacteria prevent pathogens infection by producing specific metabolites. Among bacteria belonging to phylum Bacteroidota, we have previously shown that Bacteroides fragilis or its cell-free supernatant inhibited in vitro Salmonella Heidelberg translocation. In the present study, we have analyzed this supernatant to identify bioactive molecules after extraction and subsequent fractionation using a semi-preparative reversed-phase Liquid Chromatography High-Resolution Tandem Mass Spectrometry (LC-HRMS/MS). The results indicated that only two fractions (F3 and F4) strongly inhibited S. Heidelberg translocation in a model mimicking the intestinal epithelium. The efficiency of the bioactive fractions was evaluated in BALB/c mice, and the results showed a decrease of S. Heidelberg in Peyer’s patches and spleen, associated with a decrease in inflammatory cytokines and neutrophils infiltration. The reduction of the genus Alistipes in mice receiving the fractions could be related to the anti-inflammatory effects of bioactive fractions. Furthermore, these bioactive fractions did not alter the gut microbiota diversity in mice. To further characterize the compounds present in these bioactive fractions, Liquid Chromatography High-Resolution Tandem Mass Spectrometry (LC-HRMS/MS) data were analyzed through molecular networking, highlighting cholic acid (CA) and deoxycholic acid. In vitro, CA had inhibitory activity against the translocation of S. Heidelberg by significantly decreasing the expression of Salmonella virulence genes such as sipA. The bioactive fractions also significantly downregulated the flagellar gene fliC, suggesting the involvement of other active molecules. This study showed the interest to characterize better the metabolites produced by B. fragilis to make them means of fighting pathogenic bacteria by targeting their virulence factor without modifying the gut microbiota.
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Tarawneh R, Penhos E. The gut microbiome and Alzheimer's disease: Complex and bidirectional interactions. Neurosci Biobehav Rev 2022; 141:104814. [PMID: 35934087 PMCID: PMC9637435 DOI: 10.1016/j.neubiorev.2022.104814] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 07/16/2022] [Accepted: 08/01/2022] [Indexed: 11/20/2022]
Abstract
Structural and functional alterations to the gut microbiome, referred to as gut dysbiosis, have emerged as potential key mediators of neurodegeneration and Alzheimer disease (AD) pathogenesis through the "gut -brain" axis. Emerging data from animal and clinical studies support an important role for gut dysbiosis in mediating neuroinflammation, central and peripheral immune dysregulation, abnormal brain protein aggregation, and impaired intestinal and brain barrier permeability, leading to neuronal loss and cognitive impairment. Gut dysbiosis has also been shown to directly influence various mechanisms involved in neuronal growth and repair, synaptic plasticity, and memory and learning functions. Aging and lifestyle factors including diet, exercise, sleep, and stress influence AD risk through gut dysbiosis. Furthermore, AD is associated with characteristic gut microbial signatures which offer value as potential markers of disease severity and progression. Together, these findings suggest the presence of a complex bidirectional relationship between AD and the gut microbiome and highlight the utility of gut modulation strategies as potential preventative or therapeutic strategies in AD. We here review the current literature regarding the role of the gut-brain axis in AD pathogenesis and its potential role as a future therapeutic target in AD treatment and/or prevention.
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Affiliation(s)
- Rawan Tarawneh
- Department of Neurology, Center for Memory and Aging, Alzheimer Disease Research Center, The University of New Mexico, Albuquerque, NM 87106, USA.
| | - Elena Penhos
- College of Medicine, The Ohio State University, Columbus, OH, USA 43210
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20
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Implications of Microorganisms in Alzheimer's Disease. Curr Issues Mol Biol 2022; 44:4584-4615. [PMID: 36286029 PMCID: PMC9600878 DOI: 10.3390/cimb44100314] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/23/2022] [Accepted: 09/28/2022] [Indexed: 11/20/2022] Open
Abstract
Alzheimer’s disease (AD) is a deadly brain degenerative disorder that leads to brain shrinkage and dementia. AD is manifested with hyperphosphorylated tau protein levels and amyloid beta (Aβ) peptide buildup in the hippocampus and cortex regions of the brain. The nervous tissue of AD patients also contains fungal proteins and DNA which are linked to bacterial infections, suggesting that polymicrobial infections also occur in the brains of those with AD. Both immunohistochemistry and next-generation sequencing (NGS) techniques were employed to assess fungal and bacterial infections in the brain tissue of AD patients and non-AD controls, with the most prevalent fungus genera detected in AD patients being Alternaria, Botrytis, Candida, and Malassezia. Interestingly, Fusarium was the most common genus detected in the control group. Both AD patients and controls were also detectable for Proteobacteria, followed by Firmicutes, Actinobacteria, and Bacteroides for bacterial infection. At the family level, Burkholderiaceae and Staphylococcaceae exhibited higher levels in the brains of those with AD than the brains of the control group. Accordingly, there is thought to be a viscous cycle of uncontrolled neuroinflammation and neurodegeneration in the brain, caused by agents such as the herpes simplex virus type 1 (HSV1), Chlamydophilapneumonia, and Spirochetes, and the presence of apolipoprotein E4 (APOE4), which is associated with an increased proinflammatory response in the immune system. Systemic proinflammatory cytokines are produced by microorganisms such as Cytomegalovirus, Helicobacter pylori, and those related to periodontal infections. These can then cross the blood–brain barrier (BBB) and lead to the onset of dementia. Here, we reviewed the relationship between the etiology of AD and microorganisms (such as bacterial pathogens, Herpesviridae viruses, and periodontal pathogens) according to the evidence available to understand the pathogenesis of AD. These findings might guide a targeted anti-inflammatory therapeutic approach to AD.
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A proteolytically activated antimicrobial toxin encoded on a mobile plasmid of Bacteroidales induces a protective response. Nat Commun 2022; 13:4258. [PMID: 35871068 PMCID: PMC9308784 DOI: 10.1038/s41467-022-31925-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 07/11/2022] [Indexed: 01/19/2023] Open
Abstract
Phocaeicola vulgatus is one of the most abundant and ubiquitous bacterial species of the human gut microbiota, yet a comprehensive analysis of antibacterial toxin production by members of this species has not been reported. Here, we identify and characterize a previously undescribed antibacterial protein. This toxin, designated BcpT, is encoded on a small mobile plasmid that is largely confined to strains of the closely related species Phocaeicola vulgatus and Phocaeicola dorei. BcpT is unusual in that it requires cleavage at two distinct sites for activation, and we identify bacterial proteases that perform this activation. We further identify BcpT's receptor as the Lipid A-core glycan, allowing BcpT to target species of other Bacteroidales families. Exposure of cells to BcpT induces a response involving an unusual sigma/anti-sigma factor pair that is likely triggered by cell envelope stress, resulting in the expression of genes that partially protect cells from multiple antimicrobial toxins.
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22
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Yekani M, Rezaee MA, Beheshtirouy S, Baghi HB, Bazmani A, Farzinazar A, Memar MY, Sóki J. Carbapenem resistance in Bacteroides fragilis: A review of molecular mechanisms. Anaerobe 2022; 76:102606. [PMID: 35738484 DOI: 10.1016/j.anaerobe.2022.102606] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 06/10/2022] [Accepted: 06/16/2022] [Indexed: 11/28/2022]
Abstract
Carbapenems are an applicable subclass of β-lactam drugs in the antibiotic therapy of anaerobic infections, especially for poly-microbial cases, due to their broad antimicrobial spectrum on aerobic and anaerobic bacteria. Bacteroides fragilis is the most commonly recovered anaerobic bacteria in the clinical laboratories from mono- and poly-microbial infections. B. fragilis is relatively non-susceptible to different antibiotics, including β-lactams, tetracyclines, fluoroquinolones, and macrolides. Carbapenems are among the most effective drugs against B. fragilis strains with high-level resistance to different antibiotics. Increased antibiotic resistance of B. fragilis strains has been reported following the overuse of an antimicrobial agent. Earlier contact with carbapenems is linked with increased resistance to them that limits the options for treatment of B. fragilis caused infections, especially in cases caused by multidrug-resistant strains. Several molecular mechanisms of resistance to carbapenems have been described for different carbapenem-resistant bacteria. Understanding the mechanisms of resistance to antimicrobial agents is necessary for selecting alternative antimicrobial agents and the application of control strategies. In the present study, we reviewed the mechanisms contributing to resistance to carbapenems in B. fragilis strains.
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Affiliation(s)
- Mina Yekani
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
| | | | - Samad Beheshtirouy
- Cardiothoracic Department, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Ahad Bazmani
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abbas Farzinazar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Yousef Memar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - József Sóki
- Institute of Medical Microbiology, Albert Szent-Györgyi Health Centre and School of of Medicine, University of Szeged, Szeged, Hungary.
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Nandwana V, Nandwana NK, Das Y, Saito M, Panda T, Das S, Almaguel F, Hosmane NS, Das BC. The Role of Microbiome in Brain Development and Neurodegenerative Diseases. Molecules 2022; 27:3402. [PMID: 35684340 PMCID: PMC9182002 DOI: 10.3390/molecules27113402] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/18/2022] [Accepted: 05/23/2022] [Indexed: 12/13/2022] Open
Abstract
Hundreds of billions of commensal microorganisms live in and on our bodies, most of which colonize the gut shortly after birth and stay there for the rest of our lives. In animal models, bidirectional communications between the central nervous system and gut microbiota (Gut-Brain Axis) have been extensively studied, and it is clear that changes in microbiota composition play a vital role in the pathogenesis of various neurodevelopmental and neurodegenerative disorders, such as Autism Spectrum Disorder, Alzheimer's disease, Parkinson's disease, Multiple Sclerosis, Amyotrophic Lateral Sclerosis, anxiety, stress, and so on. The makeup of the microbiome is impacted by a variety of factors, such as genetics, health status, method of delivery, environment, nutrition, and exercise, and the present understanding of the role of gut microbiota and its metabolites in the preservation of brain functioning and the development of the aforementioned neurological illnesses is summarized in this review article. Furthermore, we discuss current breakthroughs in the use of probiotics, prebiotics, and synbiotics to address neurological illnesses. Moreover, we also discussed the role of boron-based diet in memory, boron and microbiome relation, boron as anti-inflammatory agents, and boron in neurodegenerative diseases. In addition, in the coming years, boron reagents will play a significant role to improve dysbiosis and will open new areas for researchers.
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Affiliation(s)
- Varsha Nandwana
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY 11201, USA; (V.N.); (N.K.N.); (T.P.); (S.D.)
| | - Nitesh K. Nandwana
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY 11201, USA; (V.N.); (N.K.N.); (T.P.); (S.D.)
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Yogarupa Das
- Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA; (Y.D.); (M.S.)
| | - Mariko Saito
- Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA; (Y.D.); (M.S.)
| | - Tanisha Panda
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY 11201, USA; (V.N.); (N.K.N.); (T.P.); (S.D.)
| | - Sasmita Das
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY 11201, USA; (V.N.); (N.K.N.); (T.P.); (S.D.)
| | - Frankis Almaguel
- School of Medicine, Loma Linda University Health, Loma Linda, CA 92350, USA;
| | - Narayan S. Hosmane
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA;
| | - Bhaskar C. Das
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY 11201, USA; (V.N.); (N.K.N.); (T.P.); (S.D.)
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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Patrick S. A tale of two habitats: Bacteroides fragilis, a lethal pathogen and resident in the human gastrointestinal microbiome. Microbiology (Reading) 2022; 168. [DOI: 10.1099/mic.0.001156] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Bacteroides fragilis
is an obligately anaerobic Gram-negative bacterium and a major colonizer of the human large colon where
Bacteroides
is a predominant genus. During the growth of an individual clonal population, an astonishing number of reversible DNA inversion events occur, driving within-strain diversity. Additionally, the
B. fragilis
pan-genome contains a large pool of diverse polysaccharide biosynthesis loci, DNA restriction/modification systems and polysaccharide utilization loci, which generates remarkable between-strain diversity. Diversity clearly contributes to the success of
B. fragilis
within its normal habitat of the gastrointestinal (GI) tract and during infection in the extra-intestinal host environment. Within the GI tract,
B. fragilis
is usually symbiotic, for example providing localized nutrients for the gut epithelium, but
B. fragilis
within the GI tract may not always be benign. Metalloprotease toxin production is strongly associated with colorectal cancer.
B. fragilis
is unique amongst bacteria; some strains export a protein >99 % structurally similar to human ubiquitin and antigenically cross-reactive, which suggests a link to autoimmune diseases.
B. fragilis
is not a primary invasive enteric pathogen; however, if colonic contents contaminate the extra-intestinal host environment, it successfully adapts to this new habitat and causes infection; classically peritoneal infection arising from rupture of an inflamed appendix or GI surgery, which if untreated, can progress to bacteraemia and death. In this review selected aspects of
B. fragilis
adaptation to the different habitats of the GI tract and the extra-intestinal host environment are considered, along with the considerable challenges faced when studying this highly variable bacterium.
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Affiliation(s)
- Sheila Patrick
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences Queen’s University Belfast, 97 Lisburn Rd, Belfast BT9 7BL, UK
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25
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Li Y, Cao W, Gao NL, Zhao XM, Chen WH. Consistent Alterations of Human Fecal Microbes After Transplantation into Germ-free Mice. GENOMICS, PROTEOMICS & BIOINFORMATICS 2022; 20:382-393. [PMID: 34118462 PMCID: PMC9684084 DOI: 10.1016/j.gpb.2020.06.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 04/21/2020] [Accepted: 09/08/2020] [Indexed: 01/05/2023]
Abstract
Fecal microbiota transplantation (FMT) of human fecal samples into germ-free (GF) mice is useful for establishing causal relationships between the gut microbiota and human phenotypes. However, due to the intrinsic differences between human and mouse intestines and the different diets of the two organisms, it may not be possible to replicate human phenotypes in mice through FMT; similarly, treatments that are effective in mouse models may not be effective in humans. In this study, we aimed to identify human gut microbes that undergo significant and consistent changes (i.e., in relative abundances) after transplantation into GF mice in multiple experimental settings. We collected 16S rDNA-seq data from four published studies and analyzed the gut microbiota profiles from 1713 human-mouse pairs. Strikingly, on average, we found that only 47% of the human gut microbes could be re-established in mice at the species level, among which more than 1/3 underwent significant changes (referred to as "variable taxa"). Most of the human gut microbes that underwent significant changes were consistent across multiple human-mouse pairs and experimental settings. Consequently, about 1/3 of human samples changed their enterotypes, i.e., significant changes in their leading species after FMT. Mice fed with a controlled diet showed a lower enterotype change rate (23.5%) than those fed with a noncontrolled diet (49.0%), suggesting a possible solution for rescue. Most of the variable taxa have been reported to be implicated in human diseases, with some recognized as the causative species. Our results highlight the challenges of using a mouse model to replicate human gut microbiota-associated phenotypes, provide useful information for researchers using mice in gut microbiota studies, and call for additional validations after FMT. An online database named FMT-DB is publicly available at http://fmt2mice.humangut.info/#/.
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Affiliation(s)
- Yanze Li
- MOE Key Laboratory of Molecular Biophysics, Hubei Key Laboratory of Bioinformatics and Molecular-imaging, Department of Bioinformatics and Systems Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Wenming Cao
- MOE Key Laboratory of Molecular Biophysics, Hubei Key Laboratory of Bioinformatics and Molecular-imaging, Department of Bioinformatics and Systems Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Na L Gao
- MOE Key Laboratory of Molecular Biophysics, Hubei Key Laboratory of Bioinformatics and Molecular-imaging, Department of Bioinformatics and Systems Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xing-Ming Zhao
- Institute of Science and Technology for Brain-Inspired Intelligence (ISTBI), Fudan University, Shanghai 200433, China,Corresponding authors.
| | - Wei-Hua Chen
- MOE Key Laboratory of Molecular Biophysics, Hubei Key Laboratory of Bioinformatics and Molecular-imaging, Department of Bioinformatics and Systems Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China,College of Life Science, Henan Normal University, Xinxiang 453007, China,Corresponding authors.
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26
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Wang N, Feng BN, Hu B, Cheng YL, Guo YH, Qian H. Neuroprotection of chicoric acid in a mouse model of Parkinson's disease involves gut microbiota and TLR4 signaling pathway. Food Funct 2022; 13:2019-2032. [PMID: 35103734 DOI: 10.1039/d1fo02216d] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Chicoric acid (CA), a polyphenolic acid obtained from chicory and purple coneflower (Echinacea purpurea), has been regarded as a nutraceutical to combat inflammation, viruses and obesity. Parkinson's disease (PD) is a common neurodegenerative disorder, and the microbiota-gut-brain axis might be the potential mechanism in the pathogenesis and development of PD. The results obtained in this study demonstrated that oral pretreatments of CA significantly prevented the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced motor dysfunctions and death of nigrostriatal dopaminergic neurons along with the inhibition of glial hyperactivation and the increment in striatal neurotrophins. 16S rRNA sequence results showed that CA significantly reduced MPTP-induced microbial dysbiosis and partially restored the composition of the gut microbiota to normal, including decreased phylum Bacteroidetes and genera Parabacteroide, as well as increased phylum Firmicutes, genera Lactobacillus and Ruminiclostridium. Besides, CA promoted colonic epithelial integrity and restored normal SCFA production. We also observed that proinflammatory cytokines such as TNF-α and IL-1β in the serum, striatum and colon were reduced by CA, indicating that CA prevented neuroinflammation and gut inflammation, in which the suppression of the TLR4/MyD88/NF-κB signaling pathway might be the underlying molecular mechanism. These findings demonstrated that CA had neuroprotective effects on MPTP-induced PD mice possibly via modulating the gut microbiota and inhibiting inflammation throughout the brain-gut axis.
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Affiliation(s)
- Ning Wang
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
| | - Bai-Nian Feng
- School of Pharmaceutical Science, Jiangnan University, Wuxi 214122, China
| | - Bin Hu
- School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Yu-Liang Cheng
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
| | - Ya-Hui Guo
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
| | - He Qian
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
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27
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Bao Y, Verdegaal AA, Anderson BW, Barry NA, He J, Gao X, Goodman AL. A Common Pathway for Activation of Host-Targeting and Bacteria-Targeting Toxins in Human Intestinal Bacteria. mBio 2021; 12:e0065621. [PMID: 34465018 PMCID: PMC8406203 DOI: 10.1128/mbio.00656-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 08/02/2021] [Indexed: 11/26/2022] Open
Abstract
Human gut microbes exhibit a spectrum of cooperative and antagonistic interactions with their host and also with other microbes. The major Bacteroides host-targeting virulence factor, Bacteroides fragilis toxin (BFT), is produced as an inactive protoxin by enterotoxigenic B. fragilis strains. BFT is processed by the conserved bacterial cysteine protease fragipain (Fpn), which is also encoded in B. fragilis strains that lack BFT. In this report, we identify a secreted antibacterial protein (fragipain-activated bacteriocin 1 [Fab1]) and its cognate immunity protein (resistance to fragipain-activated bacteriocin 1 [RFab1]) in enterotoxigenic and nontoxigenic strains of B. fragilis. Although BFT and Fab1 share no sequence identity, Fpn also activates the Fab1 protoxin, resulting in its secretion and antibacterial activity. These findings highlight commonalities between host- and bacterium-targeting toxins in intestinal bacteria and suggest that antibacterial antagonism may promote the conservation of pathways that activate host-targeting virulence factors. IMPORTANCE The human intestine harbors a highly complex microbial community; interpersonal variation in this community can impact pathogen susceptibility, metabolism, and other aspects of health. Here, we identified and characterized a commensal-targeting antibacterial protein encoded in the gut microbiome. Notably, a shared pathway activates this antibacterial toxin and a host-targeting toxin. These findings highlight unexpected commonalities between host- and bacterium-targeting toxins in intestinal bacteria.
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Affiliation(s)
- Yiqiao Bao
- Department of Microbial Pathogenesis, Yale University, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, New Haven, Connecticut, USA
| | - Andrew A. Verdegaal
- Department of Microbial Pathogenesis, Yale University, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, New Haven, Connecticut, USA
| | - Brent W. Anderson
- Department of Microbial Pathogenesis, Yale University, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, New Haven, Connecticut, USA
| | - Natasha A. Barry
- Department of Microbial Pathogenesis, Yale University, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, New Haven, Connecticut, USA
| | - Jing He
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Xiang Gao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Andrew L. Goodman
- Department of Microbial Pathogenesis, Yale University, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, New Haven, Connecticut, USA
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Abstract
INTRODUCTION While recent reports underscore the significance of the gut microbiome (GM) in health and disease, its importance in burn outcomes remains unclear. Moreover, aggressive intravenous (IV) fluid resuscitation of patients may alter intestinal flora. Herein, we describe GM changes following a large burn in swine randomized to different volumes of IV Lactated Ringers' (LR). METHODS Anesthetized Yorkshire swine sustained 40% total body surface area full-thickness burns and were randomized to different volumes of IV LR: none (n = 5), 15 mL/kg/d (low; n = 6), or 80 mL/kg/d (high; n = 6). At baseline and days 1 and 2, fecal swabs were collected for 16s rDNA sequencing. Proximal jejunum was collected immediately after euthanasia (day 2) for western blot, histopathology, and cytokine analyses. RESULTS Burns produced significant shifts in β-diversity and non-significant reductions in α-diversity that did not recover regardless of treatment group. Burn-induced increases in Proteobacteria and decreases in Firmicutes were attenuated by IV fluids in a dose-dependent manner, and also correlated with α-diversity. IV fluids caused a dose-dependent increase in Bacteroides and prevented a transient increase in the opportunistic pathogen Haemophilus parainfluenzae. While high volumes of IV fluids increased intestinal Hsp70 levels (P = 0.0464), they reduced SGLT1 (P = 0.0213) and caspase3 (P = 0.0139) levels. IV fluids elicited a non-specific cytokine response; however, Bacteroidetes levels correlated with intestinal IL18 levels (P = 0.0166, R = 0.4201). CONCLUSIONS We present the first report on the gut microbiome in a porcine burn model, and present data to suggest that IV fluids may influence GM and gut functional proteins following a burn. Overall, burn-induced GM diversity shifts may expose diagnostic and/or therapeutic targets to improve outcomes.
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Villard A, Boursier J, Andriantsitohaina R. Microbiota-derived extracellular vesicles and metabolic syndrome. Acta Physiol (Oxf) 2021; 231:e13600. [PMID: 33319492 DOI: 10.1111/apha.13600] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 11/23/2020] [Accepted: 12/09/2020] [Indexed: 12/13/2022]
Abstract
AIM Metabolic syndrome is a major health problem concerning approximately 25% of worldwide population. Metabolic syndrome regroups a cluster of five metabolic abnormalities predisposing to Type 2 Diabetes mellitus. Dysbiotic gut microbiota is accompanied by an increase of both intestinal permeability and pathogen-associated molecular patterns translocation into blood circulation to induce metabolic endotoxemia responsible for the low-grade systemic inflammation and insulin resistance in metabolic syndrome. Among pathogen-associated molecular patterns, bacterial extracellular vesicles are gaining growing attention. The latter are produced by eukaryotic and prokaryotic cells and are vectors of communication between gut microbiota and its host The present review brings evidence to the importance of the control of the balance between the different subsets of gut microbiota in the development of metabolic diseases including metabolic syndrome. RESULTS The ability of bacteria, including gut bacteria, to release extracellular vesicles implicated in host metabolic homeostasis is highlighted with their plethora of actions on intestinal barrier, inflammation and insulin resistance. CONCLUSION Bacterial extracellular vesicles can be considered as key players in the pathophysiological of metabolic diseases and may represent an interesting strategy for specific manipulations of microbiome for promoting host health.
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Affiliation(s)
- Alexandre Villard
- INSERM UMR1063 Stress Oxydant et Pathologies Métaboliques Faculté de Santé Université d’AngersUniversité Bretagne Loire Angers France
- Hémodynamique Interaction Fibrose et Invasivité Tumorales Hépatiques (HIFIH) Angers France
| | - Jérôme Boursier
- Hémodynamique Interaction Fibrose et Invasivité Tumorales Hépatiques (HIFIH) Angers France
| | - Ramaroson Andriantsitohaina
- INSERM UMR1063 Stress Oxydant et Pathologies Métaboliques Faculté de Santé Université d’AngersUniversité Bretagne Loire Angers France
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Shukla PK, Delotterie DF, Xiao J, Pierre JF, Rao R, McDonald MP, Khan MM. Alterations in the Gut-Microbial-Inflammasome-Brain Axis in a Mouse Model of Alzheimer's Disease. Cells 2021; 10:cells10040779. [PMID: 33916001 PMCID: PMC8067249 DOI: 10.3390/cells10040779] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/26/2021] [Accepted: 03/27/2021] [Indexed: 02/07/2023] Open
Abstract
Alzheimer’s disease (AD), a progressive neurodegenerative disorder characterized by memory loss and cognitive decline, is a major cause of death and disability among the older population. Despite decades of scientific research, the underlying etiological triggers are unknown. Recent studies suggested that gut microbiota can influence AD progression; however, potential mechanisms linking the gut microbiota with AD pathogenesis remain obscure. In the present study, we provided a potential mechanistic link between dysbiotic gut microbiota and neuroinflammation associated with AD progression. Using a mouse model of AD, we discovered that unfavorable gut microbiota are correlated with abnormally elevated expression of gut NLRP3 and lead to peripheral inflammasome activation, which in turn exacerbates AD-associated neuroinflammation. To this end, we observe significantly altered gut microbiota compositions in young and old 5xFAD mice compared to age-matched non-transgenic mice. Moreover, 5xFAD mice demonstrated compromised gut barrier function as evident from the loss of tight junction and adherens junction proteins compared to non-transgenic mice. Concurrently, we observed increased expression of NLRP3 inflammasome and IL-1β production in the 5xFAD gut. Consistent with our hypothesis, increased gut–microbial–inflammasome activation is positively correlated with enhanced astrogliosis and microglial activation, along with higher expression of NLRP3 inflammasome and IL-1β production in the brains of 5xFAD mice. These data indicate that the elevated expression of gut–microbial–inflammasome components may be an important trigger for subsequent downstream activation of inflammatory and potentially cytotoxic mediators, and gastrointestinal NLRP3 may promote NLRP3 inflammasome-mediated neuroinflammation. Thus, modulation of the gut microbiota may be a potential strategy for the treatment of AD-related neurological disorders in genetically susceptible hosts.
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Affiliation(s)
- Pradeep K. Shukla
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
- Correspondence: (P.K.S.); (M.M.K.); Tel.: 1-901-448-3180; Fax: 1-901-448-1662 (M.M.K.)
| | - David F. Delotterie
- Department of Neurology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (D.F.D.); (J.X.); (M.P.M.)
| | - Jianfeng Xiao
- Department of Neurology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (D.F.D.); (J.X.); (M.P.M.)
| | - Joseph F. Pierre
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - RadhaKrishna Rao
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Michael P. McDonald
- Department of Neurology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (D.F.D.); (J.X.); (M.P.M.)
- Department of Anatomy & Neurobiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Neuroscience Institute, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Mohammad Moshahid Khan
- Department of Neurology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (D.F.D.); (J.X.); (M.P.M.)
- Neuroscience Institute, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Center for Muscle, Metabolism, and Neuropathology, Division of Rehabilitation Sciences and Department of Physical Therapy, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Correspondence: (P.K.S.); (M.M.K.); Tel.: 1-901-448-3180; Fax: 1-901-448-1662 (M.M.K.)
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Luo D, Zhao W, Lin Z, Wu J, Lin H, Li Y, Song J, Zhang J, Peng H. The Effects of Hemodialysis and Peritoneal Dialysis on the Gut Microbiota of End-Stage Renal Disease Patients, and the Relationship Between Gut Microbiota and Patient Prognoses. Front Cell Infect Microbiol 2021; 11:579386. [PMID: 33834002 PMCID: PMC8021868 DOI: 10.3389/fcimb.2021.579386] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 01/25/2021] [Indexed: 11/15/2022] Open
Abstract
Gut microbiota alterations occur in end-stage renal disease (ESRD) patients with or without dialysis. However, it remains unclear whether changes in gut microbiota of dialysis ESRD patients result from dialysis or ESRD, or both. Similarly, there is a dearth of information on the relationship between gut microbiota and ESRD prognoses. We collected fecal samples and tracked clinical outcomes from 73 ESRD patients, including 33 pre-dialysis ESRD patients, 19 peritoneal dialysis (PD) patients, and 21 hemodialysis (HD) patients. 16S rRNA sequencing and bioinformatics tools were used to analyze the gut microbiota of ESRD patients and healthy controls. Gut microbiota diversity was different before and after dialysis. Bacteroidetes were significantly deceased in HD patients. Twelve bacterial genera exhibited statistically significant differences, due to dialysis (all P < 0.05, FDR corrected). HD reversed abnormal changes in Oscillospira and SMB53 in pre-dialysis patients. Functional predictions of microbial communities showed that PD and HD altered signal transduction and metabolic pathways in ESRD patients. Furthermore, Bacteroides and Phascolarctobacterium were associated with cardiovascular mortality. Dorea, Clostridium, and SMB53 were related to peritonitis in PD patients. This study not only demonstrated differences in gut microbiota between pre-dialysis and dialysis ESRD patients, but also firstly proposed gut bacteria may exert an impact on patient prognosis.
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Affiliation(s)
- Dan Luo
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Department of Nephrology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Wenbo Zhao
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhiming Lin
- Department of Rheumatology and Immunology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jianhao Wu
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Hongchun Lin
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yongjie Li
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jun Song
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jun Zhang
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Hui Peng
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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Chen ZJ, Liang CY, Yang LQ, Ren SM, Xia YM, Cui L, Li XF, Gao BL. Association of Parkinson's Disease With Microbes and Microbiological Therapy. Front Cell Infect Microbiol 2021; 11:619354. [PMID: 33763383 PMCID: PMC7982661 DOI: 10.3389/fcimb.2021.619354] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 01/28/2021] [Indexed: 12/11/2022] Open
Abstract
Parkinson's disease (PD) is the most common movement disorder in the world, affecting 1-2 per 1,000 of the population. The main pathological changes of PD are damage of dopaminergic neurons in substantia nigra of the central nervous system and formation of Lewy bodies. These pathological changes also occur in the intestinal tract and are strongly associated with changes in intestinal flora. By reviewing the research progress in PD and its association with intestinal flora in recent years, this review expounded the mechanism of action between intestinal flora and PD as well as the transmission mode of α - synuclein in neurons. In clinical studies, β diversity of intestinal flora in PD patients was found to change significantly, with Lactobacillusaceae and Verrucomicrobiaceae being significantly increased and Lachnospiraceae and Prevotellaceae being significantly decreased. In addition, a longer PD course was associated with fewer bacteria and probiotics producing short chain fatty acids, but more pathogenic bacteria. Moreover, the motor symptoms of PD patients may be related to Enterobacteriaceae and bacteria. Most importantly, catechol-O-methyltransferase inhibitors and anticholinergic drugs could change the intestinal flora of PD patients and increase the harmful flora, whereas other anti-PD drugs such as levodopa, dopamine agonist, monoamine oxidase inhibitors, and amantadine did not have these effects. Probiotics, prebiotics, and synbiotics treatment had some potential values in improving the constipation of PD patients, promoting the growth of probiotics, and improving the level of intestinal inflammation. At present, there were only a few case studies and small sample studies which have found certain clinical efficacy of fecal microbiome transplants. Further studies are necessary to elaborate the relationship of PD with microbes.
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Affiliation(s)
- Zhao-Ji Chen
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Cheng-Yu Liang
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Li-Qing Yang
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Si-Min Ren
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Yan-Min Xia
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Lei Cui
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Xiao-Fang Li
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
| | - Bu-Lang Gao
- Department of Neurology, Affiliated Hospital of Hebei University, Baoding, China
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Mu S, Zhang J, Du S, Zhu M, Wei W, Xiang J, Wang J, Han Y, Zhao Y, Zheng H, Tong C, Song Z. Gut microbiota modulation and anti-inflammatory properties of Xuanbai Chengqi decoction in septic rats. JOURNAL OF ETHNOPHARMACOLOGY 2021; 267:113534. [PMID: 33137434 DOI: 10.1016/j.jep.2020.113534] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 10/25/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Xuanbai Chengqi decoction (XBCQ), a traditional Chinese medicine formulation, was reported to have a protective role in a variety of pulmonary infection diseases. However, its mechanism remains uncertain. In the current study, we investigated the potential mechanism of XBCQ, its therapeutic effects on organ injuries induced by sepsis and gut microbiota modulation. MATERIAL AND METHODS 80 Male Sprague Dawley rats were performed cecal ligation and puncture (CLP) for sepsis model and 60 of them were treated with different doses of XBCQ (3.78, 7.56, 15.12 g/Kg, 20 rats per group) twice per day. After the most valid dose was determined, another 40 rats were divided randomly into four groups: sham group, sham + XBCQ group, sepsis group, sepsis + XBCQ group. The sepsis + XBCQ group was treated with XBCQ by intragastric administration and then twice per day. Feces of the rats were collected and the gut microbiota constituents were analyzed by 16S rDNA sequencing. Histological changes were observed by H&E staining. Occludin content in the colon was determined by immunohistochemical analysis. The concentrations of cytokines were determined by enzyme-linked immunosorbent assay (ELISA) kits. RESULTS The survival rate of septic rats was increased significantly at the dose of 7.56 g/Kg from 50% to 80% at 72 h. The gut microbiota richness and composition were disturbed in septic rats. XBCQ altered the gut microbiota, involving alpha diversity changes, significantly reducing the relative abundance of Bacteroidaceae and ClostridiumXI and increasing that of Firmicutes and Actinobacteria. Furthermore, the relative abundances of Lactobacillus, Butyricicoccus and Bifidobacterium were increased by XBCQ. Moreover, the gut barrier dysfunction was improved by XBCQ through restoring the impaired tight conjunction protein Occludin. The concentration of diamine oxidase was decreased, while the D-lactate level was elevated. Meanwhile, the level of myeloperoxidase (MPO) in the lung tissue of the XBCQ-treated group was reduced. Lung injury was also alleviated by decreased levels of tumor necrosis factor alpha (TNF-α), interleukin 1 beta (IL-1β) and interleukin 10 (IL-10) in bronchoalveolar lavage fluids (BALFs). The relative abundance of potential microbial biomarkers in four groups significantly correlated with the concentration of inflammatory factors in BALFs. CONCLUSIONS Our results suggested that XBCQ had a protective role against sepsis by modulating the gut microbiota, restoring the intestinal epithelial barrier and decreasing inflammatory responses.
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Affiliation(s)
- Sucheng Mu
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Jin Zhang
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Shilin Du
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Ming Zhu
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Wei Wei
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Jun Xiang
- Department of Integrative Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Jianli Wang
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Yi Han
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Yingjun Zhao
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China
| | - Huajun Zheng
- Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD, Fudan University, 2140 Xietu Road, Shanghai, 200032, PR China.
| | - Chaoyang Tong
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China.
| | - Zhenju Song
- Department of Emergency Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, PR China.
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Cheung GYC, Bae JS, Liu R, Hunt RL, Zheng Y, Otto M. Bacterial virulence plays a crucial role in MRSA sepsis. PLoS Pathog 2021; 17:e1009369. [PMID: 33630954 PMCID: PMC7942999 DOI: 10.1371/journal.ppat.1009369] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 03/09/2021] [Accepted: 02/10/2021] [Indexed: 12/29/2022] Open
Abstract
Bacterial sepsis is a major global cause of death. However, the pathophysiology of sepsis has remained poorly understood. In industrialized nations, Staphylococcus aureus represents the pathogen most commonly associated with mortality due to sepsis. Because of the alarming spread of antibiotic resistance, anti-virulence strategies are often proposed to treat staphylococcal sepsis. However, we do not yet completely understand if and how bacterial virulence contributes to sepsis, which is vital for a thorough assessment of such strategies. We here examined the role of virulence and quorum-sensing regulation in mouse and rabbit models of sepsis caused by methicillin-resistant S. aureus (MRSA). We determined that leukopenia was a predictor of disease outcome during an early critical stage of sepsis. Furthermore, in device-associated infection as the most frequent type of staphylococcal blood infection, quorum-sensing deficiency resulted in significantly higher mortality. Our findings give important guidance regarding anti-virulence drug development strategies for the treatment of staphylococcal sepsis. Moreover, they considerably add to our understanding of how bacterial sepsis develops by revealing a critical early stage of infection during which the battle between bacteria and leukocytes determines sepsis outcome. While sepsis has traditionally been attributed mainly to host factors, our study highlights a key role of the invading pathogen and its virulence mechanisms.
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Affiliation(s)
- Gordon Y. C. Cheung
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Justin S. Bae
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Ryan Liu
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Rachelle L. Hunt
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Yue Zheng
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Michael Otto
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
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Yekani M, Baghi HB, Vahed SZ, Ghanbari H, Hosseinpur R, Azargun R, Azimi S, Memar MY. Tightly controlled response to oxidative stress; an important factor in the tolerance of Bacteroides fragilis. Res Microbiol 2021; 172:103798. [PMID: 33485914 DOI: 10.1016/j.resmic.2021.103798] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 12/01/2022]
Abstract
The exposure of Bacteroides fragilis to highly oxygenated tissues induces an oxidative stress due to a shift from the reduced condition of the gastrointestinal tract to an aerobic environment of host tissues. The potent and effective responses to reactive oxygen species (ROS) make the B. fragilis tolerant to atmospheric oxygen for several days. The response to oxidative stress in B. fragilis is a complicated event that is induced and regulated by different agents. In this review, we will focus on the B. fragilis response to oxidative stress and present an overview of the regulators of responses to oxidative stress in this bacterium.
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Affiliation(s)
- Mina Yekani
- Department of Microbiology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran; Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
| | - Hossein Bannazadeh Baghi
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Hadi Ghanbari
- Department of Pharmacognosy, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rasul Hosseinpur
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Robab Azargun
- Department of Microbiology, Faculty of Medicine, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Somayeh Azimi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Yousef Memar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Microbiology Department, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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Lehmann C, Aali M, Zhou J, Holbein B. Comparison of Treatment Effects of Different Iron Chelators in Experimental Models of Sepsis. Life (Basel) 2021; 11:life11010057. [PMID: 33466819 PMCID: PMC7830599 DOI: 10.3390/life11010057] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/09/2021] [Accepted: 01/11/2021] [Indexed: 01/19/2023] Open
Abstract
Growing evidence indicates that dysregulated iron metabolism with altered and excess iron availability in some body compartments plays a significant role in the course of infection and sepsis in humans. Given that all bacterial pathogens require iron for growth, that iron withdrawal is a normal component of innate host defenses and that bacterial pathogens have acquired increasing levels of antibiotic resistance, targeting infection and sepsis through use of appropriate iron chelators has potential to provide new therapeutics. We have directly compared the effects of three Food and Drug Administration (FDA)-approved chelators (deferoxamine—DFO; deferiprone—DFP; and deferasirox—DFX), as were developed for treating hematological iron overload conditions, to DIBI, a novel purpose-designed, anti-infective and anti-inflammatory water-soluble hydroxypyridinone containing iron-selective copolymers. Two murine sepsis models, endotoxemia and polymicrobial abdominal sepsis, were utilized to help differentiate anti-inflammatory versus anti-infective activities of the chelators. Leukocyte adhesion, as measured by intravital microscopy, was observed in both models, with DIBI providing the most effective reduction and DFX the poorest. Inflammation in the abdominal sepsis model, assessed by cytokine measurements, indicated exacerbation by DFX and DFO for plasma Interleukin (IL)-6 and reductions to near-control levels for DIBI and DFP. Peritoneal infection burden was reduced 10-fold by DIBI while DFX and DFP provided no reductions. Overall, the results, together with those from other studies, revealed serious limitations for each of the three hematological chelators, i.e., as potentially repurposed for treating infection/sepsis. In contrast, DIBI provided therapeutic benefits, consistent with various in vitro and in vivo results from other studies, supporting the potential for its use in treating sepsis.
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Affiliation(s)
- Christian Lehmann
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS B3H 4R2, Canada;
- Correspondence:
| | - Maral Aali
- Department of Physiology and Biophysics, Dalhousie University, Halifax, NS B3H 4R2, Canada;
| | - Juan Zhou
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS B3H 4R2, Canada;
| | - Bruce Holbein
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada;
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Klancic T, Laforest-Lapointe I, Wong J, Choo A, Nettleton JE, Chleilat F, Arrieta MC, Reimer RA. Concurrent Prebiotic Intake Reverses Insulin Resistance Induced by Early-Life Pulsed Antibiotic in Rats. Biomedicines 2021; 9:biomedicines9010066. [PMID: 33445530 PMCID: PMC7827688 DOI: 10.3390/biomedicines9010066] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 12/23/2020] [Accepted: 01/08/2021] [Indexed: 12/22/2022] Open
Abstract
Pulsed antibiotic treatment (PAT) early in life increases risk of obesity. Prebiotics can reduce fat mass and improve metabolic health. We examined if co-administering prebiotic with PAT reduces obesity risk in rat pups weaned onto a high fat/sucrose diet. Pups were randomized to (1) control [CTR], (2) antibiotic [ABT] (azithromycin), (3) prebiotic [PRE] (10% oligofructose (OFS)), (4) antibiotic + prebiotic [ABT + PRE]. Pulses of antibiotics/prebiotics were administered at d19-21, d28-30 and d37-39. Male and female rats given antibiotics (ABT) had higher body weight than all other groups at 10 wk of age. The PAT phenotype was stronger in ABT males than females, where increased fat mass, hyperinsulinemia and insulin resistance were present and all reversible with prebiotics. Reduced hypothalamic and hepatic expression of insulin receptor substrates and ileal tight junction proteins was seen in males only, explaining their greater insulin resistance. In females, insulin resistance was improved with prebiotics and normalized to lean control. ABT reduced Lactobacillaceae and increased Bacteroidaceae in both sexes. Using a therapeutic dose of an antibiotic commonly used for acute infection in children, PAT increased body weight and impaired insulin production and insulin sensitivity. The effects were reversed with prebiotic co-administration in a sex-specific manner.
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Affiliation(s)
- Teja Klancic
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
| | - Isabelle Laforest-Lapointe
- Department of Physiology & Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada; (I.L.-L.); (M.-C.A.)
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - Jolene Wong
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
| | - Ashley Choo
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
| | - Jodi E. Nettleton
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
| | - Faye Chleilat
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
| | - Marie-Claire Arrieta
- Department of Physiology & Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada; (I.L.-L.); (M.-C.A.)
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - Raylene A. Reimer
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (T.K.); (J.W.); (A.C.); (J.E.N.); (F.C.)
- Department of Biochemistry & Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
- Correspondence: ; Tel.: +1-403-220-8218
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Lukiw WJ, Arceneaux L, Li W, Bond T, Zhao Y. Gastrointestinal (GI)-Tract Microbiome Derived Neurotoxins and their Potential Contribution to Inflammatory Neurodegeneration in Alzheimer's Disease (AD). JOURNAL OF ALZHEIMER'S DISEASE & PARKINSONISM 2021; 11:525. [PMID: 34457996 PMCID: PMC8395586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The human gastrointestinal (GI)-tract microbiome is a rich, complex and dynamic source of microorganisms that possess a staggering diversity and complexity. Importantly there is a significant variability in microbial complexity even amongst healthy individuals-this has made it difficult to link specific microbial abundance patterns with age-related neurological disease. GI-tract commensal microorganisms are generally beneficial to human metabolism and immunity, however enterotoxigenic forms of microbes possess significant potential to secrete what are amongst the most neurotoxic and pro-inflammatory biopolymers known. These include toxic glycolipids such as lipopolysaccharide (LPS), enterotoxins, microbial-derived amyloids and small non-coding RNA. One major microbial species of the GI-tract microbiome, about ~100-fold more abundant than Escherichia coli in deep GI-tract regions is Bacteroides fragilis, an anaerobic, rod-shaped Gram-negative bacterium. B. fragilis can secrete: (i) a particularly potent, pro-inflammatory and unique LPS subtype (BF-LPS); and (ii) a zinc-metalloproteinase known as B. fragilis-toxin (BFT) or fragilysin. Ongoing studies indicate that BF-LPS and/or BFT disrupt paracellular-and transcellular-barriers by cleavage of intercellular-proteins resulting in 'leaky' barriers. These barriers: (i) become defective and more penetrable with aging and disease; and (ii) permit entry of microbiome-derived neurotoxins into the systemic-circulation from which they next transit the blood-brain barrier and gain access to the CNS. Here LPS accumulates and significantly alters homeostatic patterns of gene expression. The affinity of LPS for neuronal nuclei is significantly enhanced in the presence of amyloid beta 42 (Aβ42) peptides. Recent research on the appearance of the brain thanatomicrobiome at the time of death and the increasing likelihood of a complex brain microbiome are reviewed and discussed. This paper will also highlight some recent advances in this extraordinary research area that links the pro-inflammatory exudates of the GI-tract microbiome with innate-immune disturbances and inflammatory-signaling within the CNS with reference to Alzheimer's disease (AD) wherever possible.
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Affiliation(s)
- Walter J. Lukiw
- LSU Neuroscience Center, Louisiana State University Health
Sciences Center, New Orleans, LA, United States,Department of Ophthalmology, LSU Health Sciences Center,
New Orleans, LA, United States,Department of Neurology, Louisiana State University Health
Sciences Center, New Orleans, LA, United States,Corresponding author: Dr. Walter J. Lukiw, LSU
Neuroscience Center, Louisiana State University Health Sciences Center, New
Orleans, LA, United States,
| | - Lisa Arceneaux
- LSU Neuroscience Center, Louisiana State University Health
Sciences Center, New Orleans, LA, United States
| | - Wenhong Li
- LSU Neuroscience Center, Louisiana State University Health
Sciences Center, New Orleans, LA, United States,Department of Pharmacology, School of Pharmacy, Jiangxi
University of Traditional Chinese Medicine (TCM), Nanchang, China
| | - Taylor Bond
- LSU Neuroscience Center, Louisiana State University Health
Sciences Center, New Orleans, LA, United States
| | - Yuhai Zhao
- LSU Neuroscience Center, Louisiana State University Health
Sciences Center, New Orleans, LA, United States,Department of Anatomy and Cell Biology, Louisiana State
University, New Orleans, LA, United States
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van Vuuren MJ, Nell TA, Carr JA, Kell DB, Pretorius E. Iron Dysregulation and Inflammagens Related to Oral and Gut Health Are Central to the Development of Parkinson's Disease. Biomolecules 2020; 11:E30. [PMID: 33383805 PMCID: PMC7823713 DOI: 10.3390/biom11010030] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/16/2020] [Accepted: 12/24/2020] [Indexed: 12/12/2022] Open
Abstract
Neuronal lesions in Parkinson's disease (PD) are commonly associated with α-synuclein (α-Syn)-induced cell damage that are present both in the central and peripheral nervous systems of patients, with the enteric nervous system also being especially vulnerable. Here, we bring together evidence that the development and presence of PD depends on specific sets of interlinking factors that include neuroinflammation, systemic inflammation, α-Syn-induced cell damage, vascular dysfunction, iron dysregulation, and gut and periodontal dysbiosis. We argue that there is significant evidence that bacterial inflammagens fuel this systemic inflammation, and might be central to the development of PD. We also discuss the processes whereby bacterial inflammagens may be involved in causing nucleation of proteins, including of α-Syn. Lastly, we review evidence that iron chelation, pre-and probiotics, as well as antibiotics and faecal transplant treatment might be valuable treatments in PD. A most important consideration, however, is that these therapeutic options need to be validated and tested in randomized controlled clinical trials. However, targeting underlying mechanisms of PD, including gut dysbiosis and iron toxicity, have potentially opened up possibilities of a wide variety of novel treatments, which may relieve the characteristic motor and nonmotor deficits of PD, and may even slow the progression and/or accompanying gut-related conditions of the disease.
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Affiliation(s)
- Marthinus Janse van Vuuren
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa; (M.J.v.V.); (T.A.N.)
| | - Theodore Albertus Nell
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa; (M.J.v.V.); (T.A.N.)
| | - Jonathan Ambrose Carr
- Division of Neurology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa
| | - Douglas B. Kell
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa; (M.J.v.V.); (T.A.N.)
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK
- The Novo Nordisk Foundation Centre for Biosustainability, Technical University of Denmark, Building 220, Chemitorvet 200, 2800 Kongens Lyngby, Denmark
| | - Etheresia Pretorius
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa; (M.J.v.V.); (T.A.N.)
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Ochoa-Repáraz J, Ramelow CC, Kasper LH. A Gut Feeling: The Importance of the Intestinal Microbiota in Psychiatric Disorders. Front Immunol 2020; 11:510113. [PMID: 33193297 PMCID: PMC7604426 DOI: 10.3389/fimmu.2020.510113] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 09/30/2020] [Indexed: 12/11/2022] Open
Abstract
The intestinal microbiota constitutes a complex ecosystem in constant reciprocal interactions with the immune, neuroendocrine, and neural systems of the host. Recent molecular technological advances allow for the exploration of this living organ and better facilitates our understanding of the biological importance of intestinal microbes in health and disease. Clinical and experimental studies demonstrate that intestinal microbes may be intimately involved in the progression of diseases of the central nervous system (CNS), including those of affective and psychiatric nature. Gut microbes regulate neuroinflammatory processes, play a role in balancing the concentrations of neurotransmitters and could provide beneficial effects against neurodegeneration. In this review, we explore some of these reciprocal interactions between gut microbes and the CNS during experimental disease and suggest that therapeutic approaches impacting the gut-brain axis may represent the next avenue for the treatment of psychiatric disorders.
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Affiliation(s)
| | | | - Lloyd H. Kasper
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth College, Hanover, NH, United States
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Pierce JV, Fellows JD, Anderson DE, Bernstein HD. A clostripain-like protease plays a major role in generating the secretome of enterotoxigenic Bacteroides fragilis. Mol Microbiol 2020; 115:290-304. [PMID: 32996200 DOI: 10.1111/mmi.14616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/21/2020] [Accepted: 09/23/2020] [Indexed: 11/27/2022]
Abstract
Bacteroides fragilis toxin (BFT) is a protein secreted by enterotoxigenic (ETBF) strains of B. fragilis. BFT is synthesized as a proprotein (proBFT) that is predicted to be a lipoprotein and that is cleaved into two discrete fragments by a clostripain-like protease called fragipain (Fpn). In this study, we obtained evidence that Fpn cleaves proBFT following its transport across the outer membrane. Remarkably, we also found that the disruption of the fpn gene led to a strong reduction in the level of >100 other proteins, many of which are predicted to be lipoproteins, in the culture medium of an ETBF strain. Experiments performed with purified Fpn provided direct evidence that the protease releases at least some of these proteins from the cell surface. The observation that wild-type cells outcompeted an fpn- strain in co-cultivation assays also supported the notion that Fpn plays an important role in cell physiology and is not simply dedicated to toxin biogenesis. Finally, we found that purified Fpn altered the adhesive properties of HT29 intestinal epithelial cells. Our results suggest that Fpn is a broad-spectrum protease that not only catalyzes the protein secretion on a wide scale but that also potentially cleaves host cell proteins during colonization.
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Affiliation(s)
- Jessica V Pierce
- Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Justin D Fellows
- Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - D Eric Anderson
- Advanced Mass Spectrometry Facility, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Harris D Bernstein
- Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
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Jang JH, Yeom MJ, Ahn S, Oh JY, Ji S, Kim TH, Park HJ. Acupuncture inhibits neuroinflammation and gut microbial dysbiosis in a mouse model of Parkinson's disease. Brain Behav Immun 2020; 89:641-655. [PMID: 32827699 DOI: 10.1016/j.bbi.2020.08.015] [Citation(s) in RCA: 113] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 08/04/2020] [Accepted: 08/17/2020] [Indexed: 12/18/2022] Open
Abstract
Growing evidences show that gut microbiota is associated with the pathogenesis of Parkinson's disease (PD) and the gut-brain axis can be promising target for the development of the therapeutic strategies for PD. Acupuncture has been used to improve brain functions and inflammation in neurological disorders such as PD, and to recover the gastrointestinal dysfunctions in various gastrointestinal disorders. Thus, we investigated whether acupuncture could improve Parkinsonism and gut microbial dysbiosis induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. First, we observed that acupuncture treatment at acupoints GB34 and ST36 could improve motor functions and comorbid anxiety in PD mice. Next, we found that acupuncture increased the levels of dopaminergic fibers and neurons in the striatum and the substantia nigra, respectively. Acupuncture also restored the overexpression of microglia and astrocyte as well as conversion of Bax and Bcl-2 expression in both the striatum and the substantia nigra, indicating that inflammatory responses and apoptosis were blocked by acupuncture. Additionally, via 16S rRNA sequence analysis, we observed that the relative abundance of 18 genera were changed in acupuncture-treated mice compared to the PD mice. Of them, Butyricimonas, Holdemania, Frisingicoccus, Gracilibacter, Phocea, and Aestuariispira showed significant correlations with anxiety as well as motor functions. Furthermore, the predicted functional analyses showed that acupuncture restored the physiology functions such as glutathione metabolism, methane metabolism, and PD pathway. In conclusion, we suggest that the effects of acupuncture on the enhanced motor function and the protection of the dopaminergic neurons may be associated with the regulation of the gut microbial dysbiosis and thus the inhibition of the neuroinflammation in the PD mice.
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Affiliation(s)
- Jae-Hwan Jang
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Mi-Jung Yeom
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Sora Ahn
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Ju-Young Oh
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Suhwan Ji
- Department of Korean Medical Science, Graduate School of Korean Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Tae-Hong Kim
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea
| | - Hi-Joon Park
- Integrative Parkinson's Disease Research Group, Acupuncture & Meridian Science Research Center, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea; Department of Korean Medical Science, Graduate School of Korean Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, Republic of Korea.
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43
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Tang L, Gu S, Gong Y, Li B, Lu H, Li Q, Zhang R, Gao X, Wu Z, Zhang J, Zhang Y, Li L. Clinical Significance of the Correlation between Changes in the Major Intestinal Bacteria Species and COVID-19 Severity. ENGINEERING (BEIJING, CHINA) 2020; 6:1178-1184. [PMID: 33520333 PMCID: PMC7832131 DOI: 10.1016/j.eng.2020.05.013] [Citation(s) in RCA: 109] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 02/21/2020] [Accepted: 02/22/2020] [Indexed: 05/27/2023]
Abstract
Coronavirus disease 2019 (COVID-19) is a highly contagious infectious disease. Similar to H7N9 infection, pneumonia and cytokine storm are typical clinical manifestations of COVID-19. Our previous studies found that H7N9 patients had intestinal dysbiosis. However, the relationship between the gut microbiome and COVID-19 has not been determined. This study recruited a cohort of 57 patients with either general (n = 20), severe (n = 19), or critical (n = 18) disease. The objective of this study was to investigate changes in the abundance of ten predominant intestinal bacterial groups in COVID-19 patients using quantitative polymerase chain reaction (q-PCR), and to establish a correlation between these bacterial groups and clinical indicators of pneumonia in these patients. The results indicated that dysbiosis occurred in COVID-19 patients and changes in the gut microbial community were associated with disease severity and hematological parameters. The abundance of butyrate-producing bacteria, such as Faecalibacterium prausnitzii, Clostridium butyricum, Clostridium leptum, and Eubacterium rectale, decreased significantly, and this shift in bacterial community may help discriminate critical patients from general and severe patients. Moreover, the number of common opportunistic pathogens Enterococcus (Ec) and Enterobacteriaceae (E) increased, especially in critically ill patients with poor prognosis. The results suggest that these bacterial groups can serve as diagnostic biomarkers for COVID-19, and that the Ec/E ratio can be used to predict death in critically ill patients.
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Affiliation(s)
- Lingling Tang
- Department of Infectious Diseases, Shulan (Hangzhou) Hospital Affiliated to Zhejiang Shuren University Shulan International Medical College, Hangzhou 310003, China
| | - Silan Gu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Yiwen Gong
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Bo Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Haifeng Lu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Qiang Li
- Shaoxing Tongchuang Medical Equipment Co., Ltd., Shaoxing 312000, China
| | - Ruhong Zhang
- Renmin Hospital of Wuhan University, Wuhan 430200, China
| | - Xiang Gao
- Renmin Hospital of Wuhan University, Wuhan 430200, China
| | - Zhengjie Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Jiaying Zhang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Yuanyuan Zhang
- Department of Infectious Diseases, Shulan (Hangzhou) Hospital Affiliated to Zhejiang Shuren University Shulan International Medical College, Hangzhou 310003, China
| | - Lanjuan Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
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44
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Yekani M, Baghi HB, Naghili B, Vahed SZ, Sóki J, Memar MY. To resist and persist: Important factors in the pathogenesis of Bacteroides fragilis. Microb Pathog 2020; 149:104506. [PMID: 32950639 DOI: 10.1016/j.micpath.2020.104506] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 07/15/2020] [Accepted: 09/15/2020] [Indexed: 02/07/2023]
Abstract
Bacteroides fragilis is a most frequent anaerobic pathogen isolated from human infections, particularly found in the abdominal cavity. Different factors contribute to the pathogenesis and persistence of B. fragilis at infection sites. The knowledge of the virulence factors can provide applicable information for finding alternative options for the antibiotic therapy and treatment of B. fragilis caused infections. Herein, a comprehensive review of the important B. fragilis virulence factors was prepared. In addition to B. fragilis toxin (BFT) and its potential role in the diarrhea and cancer development, some other important virulence factors and characteristics of B. fragilis are described including capsular polysaccharides, iron acquisition, resistance to antimicrobial agents, and survival during the prolonged oxidative stress, quorum sensing, and secretion systems.
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Affiliation(s)
- Mina Yekani
- Department of Microbiology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran; Student Research Committee,Kashan University of Medical Sciences, Kashan, Iran
| | - Hossein Bannazadeh Baghi
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Behrooz Naghili
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - József Sóki
- Institute of Clinical Microbiology, Faculty of Medicine, University of Szeged, Szeged, Hungary.
| | - Mohammad Yousef Memar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Microbiology Department, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran; Students' Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.
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45
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Kohl HM, Castillo AR, Ochoa-Repáraz J. The Microbiome as a Therapeutic Target for Multiple Sclerosis: Can Genetically Engineered Probiotics Treat the Disease? Diseases 2020; 8:diseases8030033. [PMID: 32872621 PMCID: PMC7563507 DOI: 10.3390/diseases8030033] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/15/2020] [Accepted: 08/25/2020] [Indexed: 02/06/2023] Open
Abstract
There is an increasing interest in the intestinal microbiota as a critical regulator of the development and function of the immune, nervous, and endocrine systems. Experimental work in animal models has provided the foundation for clinical studies to investigate associations between microbiota composition and function and human disease, including multiple sclerosis (MS). Initial work done using an animal model of brain inflammation, experimental autoimmune encephalomyelitis (EAE), suggests the existence of a microbiota-gut-brain axis connection in the context of MS, and microbiome sequence analyses reveal increases and decreases of microbial taxa in MS intestines. In this review, we discuss the impact of the intestinal microbiota on the immune system and the role of the microbiome-gut-brain axis in the neuroinflammatory disease MS. We also discuss experimental evidence supporting the hypothesis that modulating the intestinal microbiota through genetically modified probiotics may provide immunomodulatory and protective effects as a novel therapeutic approach to treat this devastating disease.
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Vernay T, Cannie I, Gaboriau F, Gall SDL, Tamanai-Shacoori Z, Burel A, Jolivet-Gougeon A, Loréal O, Bousarghin L. Bacteroides fragilis prevents Salmonella Heidelberg translocation in co-culture model mimicking intestinal epithelium. Benef Microbes 2020; 11:391-401. [PMID: 32720833 DOI: 10.3920/bm2020.0004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Salmonella Heidelberg is one of the most common serovar causing foodborne illnesses. To limit the development of digestive bacterial infection, food supplements containing probiotic bacteria can be proposed. Commensal non-toxigenic Bacteroides fragilis has recently been suggested as a next-generation probiotic candidate. By using an original triple co-culture model including Caco-2 cells (representing human enterocytes), HT29-MTX (representing mucus-secreting goblet cells), and M cells differentiated from Caco-2 by addition of Raji B lymphocytes, bacterial translocation was evaluated. The data showed that S. Heidelberg could translocate in the triple co-culture model with high efficiency, whereas for B. fragilis a weak translocation was obtained. When cells were exposed to both bacteria, S. Heidelberg translocation was inhibited. The cell-free supernatant of B. fragilis also inhibited S. Heidelberg translocation without impacting epithelial barrier integrity. This supernatant did not affect the growth of S. Heidelberg. The non-toxigenic B. fragilis confers health benefits to the host by reducting bacterial translocation. These results suggested that the multicellular model provides an efficient in vitro model to evaluate the translocation of pathogens and to screen for probiotics that have a potential inhibitory effect on this translocation.
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Affiliation(s)
- T Vernay
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - I Cannie
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - F Gaboriau
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - S David-Le Gall
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - Z Tamanai-Shacoori
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - A Burel
- Plateforme microscopie électronique MRic/ISFR Biosit/campus Santé, Rennes 1, 2 Avenue du Professeur Léon Bernard, 35000 Rennes, France
| | - A Jolivet-Gougeon
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - O Loréal
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
| | - L Bousarghin
- INSERM, Univ Rennes, INRAE, CHU Rennes, Nutrition Metabolisms and Cancer (NuMeCan), UMR-1241, Biosit, MRic/ISFR, 2 rue Henri Le Guilloux, 35033 Rennes, France
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Jamal W, Khodakhast FB, AlAzmi A, Sόki J, AlHashem G, Rotimi VO. Prevalence and antimicrobial susceptibility of enterotoxigenic extra-intestinal Bacteroides fragilis among 13-year collection of isolates in Kuwait. BMC Microbiol 2020; 20:14. [PMID: 31941446 PMCID: PMC6964027 DOI: 10.1186/s12866-020-1703-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 01/09/2020] [Indexed: 02/08/2023] Open
Abstract
Background Some strains of Bacteroides fragilis species are associated with diarrhea as a result of enterotoxin production (bft or fragilysin). Fragilysin is activated by C11 protease (fpn) and together with C10 protease (bfp) play a significant role in its invasiveness. The objectives of this study were to investigate the proportion of clinical isolates from extra-intestinal sources that are toxin producers and characterize the genes mediating toxin production. Clinical isolates submitted to our reference laboratory over the last 13 years were screened for toxin production using PCR technique. All stool isolates were excluded. The isolates were tested for their susceptibility to 8 antimicrobial agents by E test. Carbapenem resistance gene cfiA was detected by PCR. Results A total of 421 B. fragilis isolates were viable. Out of these, bft was detected in 210 (49.9%) isolates. Of the 210 bft-positive isolates, 171 (81.4%), 33 (15.7%) and 6 (2.8%) harbored bft-1, bft-2, and bft-3 genes, respectively. Twenty (9.5%) of the bft-positive strains originated from bloodstream infections. Twenty-five, 20 and 9 strains harbored bfp-1, bfp-2 and bfp-3 gene, respectively. Two, 3, 4 bfp isotypes were detected simultaneously in some of strains. The resistance rates against amoxicillin-clavulanic acid was 32%, clindamycin 62%, cefoxitin 26%, imipenem 11%, meropenem 17%, metronidazole 4%, piperacillin 61% and tigecycline 14%. A chromosomally located cfiA gene that encode metallo-β-lactamase was identified in only 34 isolates (16.2%). Conclusions The prevalence of enterotoxin-producing B. fragilis was high among the extra-intestinal isolates. Metronidazole was the most active agent against all isolates. There was no statistically significance difference between resistance rates among bft-positive and bft-negative isolates except for clindamycin.
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Affiliation(s)
- Wafaa Jamal
- Department of Microbiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, 13110, Safat, Kuwait.
| | - Fatima Bibi Khodakhast
- Department of Microbiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, 13110, Safat, Kuwait
| | - Ameerah AlAzmi
- Department of Microbiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, 13110, Safat, Kuwait
| | - Jόzsef Sόki
- Institute of Clinical Microbiology, University of Szeged, Szeged, Hungary
| | - Ghayda AlHashem
- Department of Microbiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, 13110, Safat, Kuwait
| | - Vincent O Rotimi
- Department of Microbiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, 13110, Safat, Kuwait
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48
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Valguarnera E, Wardenburg JB. Good Gone Bad: One Toxin Away From Disease for Bacteroides fragilis. J Mol Biol 2019; 432:765-785. [PMID: 31857085 DOI: 10.1016/j.jmb.2019.12.003] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 11/27/2019] [Accepted: 12/05/2019] [Indexed: 02/06/2023]
Abstract
The human gut is colonized by hundreds of trillions of microorganisms whose acquisition begins during early infancy. Species from the Bacteroides genus are ubiquitous commensals, comprising about thirty percent of the human gut microbiota. Bacteroides fragilis is one of the least abundant Bacteroides species, yet is the most common anaerobe isolated from extraintestinal infections in humans. A subset of B. fragilis strains carry a genetic element that encodes a metalloprotease enterotoxin named Bacteroides fragilis toxin, or BFT. Toxin-bearing strains, or Enterotoxigenic B. fragilis (ETBF) cause acute and chronic intestinal disease in children and adults. Despite this association with disease, around twenty percent of the human population appear to be asymptomatic carriers of ETBF. BFT damages the colonic epithelial barrier by inducing cleavage of the zonula adherens protein E-cadherin and initiating a cell signaling response characterized by inflammation and c-Myc-dependent pro-oncogenic hyperproliferation. As a consequence, mice harboring genetic mutations that predispose to colonic inflammation or tumor formation are uniquely susceptible to toxin-mediated injury. The recent observation of ETBF-bearing biofilms in colon biopsies from humans with colon cancer susceptibility loci strongly suggests that ETBF is a driver of colorectal cancer. This article will address ETBF biology from a host-pathobiont perspective, including clinical data, analysis of molecular mechanisms of disease, and the complex ecological context of the human gut.
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Affiliation(s)
- Ezequiel Valguarnera
- Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid Ave. Box 8208, St. Louis, MO 63110
| | - Juliane Bubeck Wardenburg
- Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid Ave. Box 8208, St. Louis, MO 63110.
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Abstract
Subtiligase-catalyzed peptide ligation is a powerful approach for site-specific protein bioconjugation, synthesis and semisynthesis of proteins and peptides, and chemoproteomic analysis of cellular N termini. Here, we provide a comprehensive review of the subtiligase technology, including its development, applications, and impacts on protein science. We highlight key advantages and limitations of the tool and compare it to other peptide ligase enzymes. Finally, we provide a perspective on future applications and challenges and how they may be addressed.
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Affiliation(s)
- Amy M Weeks
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California 94143, United States
| | - James A Wells
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California 94143, United States.,Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, California 94143, United States
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50
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Hwang S, Jo M, Hong JE, Park CO, Lee CG, Yun M, Rhee KJ. Zerumbone Suppresses Enterotoxigenic Bacteroides fragilis Infection-Induced Colonic Inflammation through Inhibition of NF-κΒ. Int J Mol Sci 2019; 20:ijms20184560. [PMID: 31540059 PMCID: PMC6770904 DOI: 10.3390/ijms20184560] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/08/2019] [Accepted: 09/10/2019] [Indexed: 02/06/2023] Open
Abstract
Enterotoxigenic Bacteroides fragilis (ETBF) is human intestinal commensal bacterium and a potent initiator of colitis through secretion of the metalloprotease Bacteroides fragilis toxin (BFT). BFT induces cleavage of E-cadherin in colon cells, which subsequently leads to NF-κB activation. Zerumbone is a key component of the Zingiber zerumbet (L.) Smith plant and can exhibit anti-bacterial and anti-inflammatory effects. However, whether zerumbone has anti-inflammatory effects in ETBF-induced colitis remains unknown. The aim of this study was to determine the anti-inflammatory effect of orally administered zerumbone in a murine model of ETBF infection. Wild-type C57BL/6 mice were infected with ETBF and orally administered zerumbone (30 or 60 mg/kg) once a day for 7 days. Treatment of ETBF-infected mice with zerumbone prevented weight loss and splenomegaly and reduced colonic inflammation with decreased macrophage infiltration. Zerumbone treatment significantly decreased expression of IL-17A, TNF-α, KC, and inducible nitric oxide synthase (iNOS) in colonic tissues of ETBF-infected mice. In addition, serum levels of KC and nitrite was also diminished. Zerumbone-treated ETBF-infected mice also showed decreased NF-κB signaling in the colon. HT29/C1 colonic epithelial cells treated with zerumbone suppressed BFT-induced NF-κB signaling and IL-8 secretion. However, BFT-mediated E-cadherin cleavage was unaffected. Furthermore, zerumbone did not affect ETBF colonization in mice. In conclusion, zerumbone decreased ETBF-induced colitis through inhibition of NF-κB signaling.
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Affiliation(s)
- Soonjae Hwang
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
- Cell Therapy and Tissue Engineering Center, Yonsei University Wonju College of Medicine, Wonju, Gangwon-do 26426, Korea.
| | - Minjeong Jo
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
| | - Ju Eun Hong
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
| | - Chan Oh Park
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
| | - Chang Gun Lee
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
| | - Miyong Yun
- Department of Bioindustry and Bioresource Engineering, College of Life Sciences, Sejong University, Seoul 05006, Korea.
| | - Ki-Jong Rhee
- Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University at Wonju, Wonju, Gangwon-do 26493, Korea.
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