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Tewari N, Dey P. Navigating commensal dysbiosis: Gastrointestinal host-pathogen interplay orchestrating opportunistic infections. Microbiol Res 2024; 286:127832. [PMID: 39013300 DOI: 10.1016/j.micres.2024.127832] [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: 04/22/2024] [Revised: 06/23/2024] [Accepted: 07/01/2024] [Indexed: 07/18/2024]
Abstract
The gut commensals, which are usually symbiotic or non-harmful bacteria that live in the gastrointestinal tract, have a positive impact on the health of the host. This review, however, specifically discuss distinct conditions where commensals aid in the development of pathogenic opportunistic infections. We discuss that the categorization of gut bacteria as either pathogens or non-pathogens depends on certain circumstances, which are significantly affected by the tissue microenvironment and the dynamic host-microbe interaction. Under favorable circumstances, commensals have the ability to transform into opportunistic pathobionts by undergoing overgrowth. These conditions include changes in the host's physiology, simultaneous infection with other pathogens, effective utilization of nutrients, interactions between different species of bacteria, the formation of protective biofilms, genetic mutations that enhance pathogenicity, acquisition of genes associated with virulence, and the ability to avoid the host's immune response. These processes allow commensals to both initiate infections themselves and aid other pathogens in populating the host. This review highlights the need of having a detailed and sophisticated knowledge of the two-sided nature of gut commensals. Although commensals mostly promote health, they may also become harmful in certain changes in the environment or the body's functioning. This highlights the need of acknowledging the intricate equilibrium in interactions between hosts and microbes, which is crucial for preserving intestinal homeostasis and averting diseases. Finally, we also emphasize the further need of research to better understand and anticipate the behavior of gut commensals in different situations, since they play a crucial and varied role in human health and disease.
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Affiliation(s)
- Nisha Tewari
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India
| | - Priyankar Dey
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India.
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2
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Dey P, Ray Chaudhuri S. The opportunistic nature of gut commensal microbiota. Crit Rev Microbiol 2023; 49:739-763. [PMID: 36256871 DOI: 10.1080/1040841x.2022.2133987] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 07/30/2022] [Accepted: 10/05/2022] [Indexed: 11/03/2022]
Abstract
The abundance of gut commensals has historically been associated with health-promoting effects despite the fact that the definition of good or bad microbiota remains condition-specific. The beneficial or pathogenic nature of microbiota is generally dictated by the dimensions of host-microbiota and microbe-microbe interactions. With the increasing popularity of gut microbiota in human health and disease, emerging evidence suggests opportunistic infections promoted by those gut bacteria that are generally considered beneficial. Therefore, the current review deals with the opportunistic nature of the gut commensals and aims to summarise the concepts behind the occasional commensal-to-pathogenic transformation of the gut microbes. Specifically, relevant clinical and experimental studies have been discussed on the overgrowth and bacteraemia caused by commensals. Three key processes and their underlying mechanisms have been summarised to be responsible for the opportunistic nature of commensals, viz. improved colonisation fitness that is dictated by commensal-pathogen interactions and availability of preferred nutrients; pathoadaptive mutations that can trigger the commensal-to-pathogen transformation; and evasion of host immune response as a survival and proliferation strategy of the microbes. Collectively, this review provides an updated concept summary on the underlying mechanisms of disease causative events driven by gut commensal bacteria.
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Affiliation(s)
- Priyankar Dey
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Saumya Ray Chaudhuri
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
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Luo R, Zhang T, Wang L, Feng Y. Emissions and mitigation potential of endocrine disruptors during outdoor exercise: Fate, transport, and implications for human health. ENVIRONMENTAL RESEARCH 2023; 236:116575. [PMID: 37487926 DOI: 10.1016/j.envres.2023.116575] [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: 05/16/2023] [Revised: 06/29/2023] [Accepted: 07/06/2023] [Indexed: 07/26/2023]
Abstract
The endocrine system is responsible for secreting and controlling hormones crucial in regulating key body activities. However, endocrine disruptors or endocrine-disrupting chemicals (EDCs) can harm human health and well-being by interfering with this complex process. This report seeks to assess the present state of understanding about endocrine disruptors in China, including their origins, impacts, and obstacles, and to provide actionable recommendations for reducing exposure and mitigating negative effects. Strong negative correlations between ANOE and rural ecological compensation (REC) and a negative correlation between ANOE and forest coverage (FC) were found in this analysis of the relationships between agricultural nitrous oxide emissions (ANOE), agricultural methane emissions (AME), and land use and land cover variables (LUPC). Just as LUPC is significantly inversely related to FC, AME is positively related. The team uses a gradient-boosted model (GBM) with a Gaussian loss function and fine-tunes the model's parameters to achieve optimal performance and reliable prediction results. With a relative relevance score of 90.36 for ANOE and 67.64 for AME, the analysis shows that LUPC is the most important factor in influencing emission levels. This study aims to increase knowledge of endocrine disruptors' potential advantages and disadvantages in outdoor exercise. The study aims to aid in preventing and managing many diseases and disorders caused by hormonal imbalances or disruptions by examining the origins, effects, and potential mitigation of these substances during outdoor activity. Safe and healthful outdoor exercise is promoted by the study's efforts to discover and implement effective and sustainable solutions to decrease emissions and exposure to endocrine disruptors. This comprehensive study aims to promote a healthier and more sustainable environment for individuals engaging in outdoor exercise by synthesizing current knowledge, providing practical recommendations, and emphasizing the importance of awareness and action.
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Affiliation(s)
- Rui Luo
- Chengdu Sport University, Tiyuan Road, Chengdu, Sichuan Province, 610041, China; College of Sports and Leisure, Sichuan Tourism University, No. 459, Hongling Road, Longquanyi District, Chengdu City, Sichuan Province, 610100, China.
| | - Tao Zhang
- College of Sports and Leisure, Sichuan Tourism University, No. 459, Hongling Road, Longquanyi District, Chengdu City, Sichuan Province, 610100, China
| | - Li Wang
- College of Sports and Leisure, Sichuan Tourism University, No. 459, Hongling Road, Longquanyi District, Chengdu City, Sichuan Province, 610100, China
| | - Yong Feng
- College of Sports and Leisure, Sichuan Tourism University, No. 459, Hongling Road, Longquanyi District, Chengdu City, Sichuan Province, 610100, China
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Alagna L, Mancabelli L, Magni F, Chatenoud L, Bassi G, Del Bianco S, Fumagalli R, Turroni F, Mangioni D, Migliorino GM, Milani C, Muscatello A, Nattino G, Picetti E, Pinciroli R, Rossi S, Tonetti T, Vargiolu A, Bandera A, Ventura M, Citerio G, Gori A. Changes in upper airways microbiota in ventilator-associated pneumonia. Intensive Care Med Exp 2023; 11:17. [PMID: 36862343 PMCID: PMC9981834 DOI: 10.1186/s40635-023-00496-5] [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: 10/14/2022] [Accepted: 02/03/2023] [Indexed: 03/03/2023] Open
Abstract
BACKGROUND The role of upper airways microbiota and its association with ventilator-associated pneumonia (VAP) development in mechanically ventilated (MV) patients is unclear. Taking advantage of data collected in a prospective study aimed to assess the composition and over-time variation of upper airway microbiota in patients MV for non-pulmonary reasons, we describe upper airway microbiota characteristics among VAP and NO-VAP patients. METHODS Exploratory analysis of data collected in a prospective observational study on patients intubated for non-pulmonary conditions. Microbiota analysis (trough 16S-rRNA gene profiling) was performed on endotracheal aspirates (at intubation, T0, and after 72 h, T3) of patients with VAP (cases cohort) and a subgroup of NO-VAP patients (control cohort, matched according to total intubation time). RESULTS Samples from 13 VAP patients and 22 NO-VAP matched controls were analyzed. At intubation (T0), patients with VAP revealed a significantly lower microbial complexity of the microbiota of the upper airways compared to NO-VAP controls (alpha diversity index of 84 ± 37 and 160 ± 102, in VAP and NO_VAP group, respectively, p-value < 0.012). Furthermore, an overall decrease in microbial diversity was observed in both groups at T3 as compared to T0. At T3, a loss of some genera (Prevotella 7, Fusobacterium, Neisseria, Escherichia-Shigella and Haemophilus) was found in VAP patients. In contrast, eight genera belonging to the Bacteroidetes, Firmicutes and Fusobacteria phyla was predominant in this group. However, it is unclear whether VAP caused dysbiosis or dysbiosis caused VAP. CONCLUSIONS In a small sample size of intubated patients, microbial diversity at intubation was less in patients with VAP compared to patients without VAP.
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Affiliation(s)
- Laura Alagna
- Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
| | - Leonardo Mancabelli
- grid.10383.390000 0004 1758 0937Department of Medicine and Surgery, University of Parma, Parma, Italy ,grid.10383.390000 0004 1758 0937Interdepartmental Research Centre Microbiome Research Hub, University of Parma, Parma, Italy
| | - Federico Magni
- grid.415025.70000 0004 1756 8604Neurointensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Liliane Chatenoud
- grid.4527.40000000106678902Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | | | - Silvia Del Bianco
- grid.415025.70000 0004 1756 8604Neurointensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Roberto Fumagalli
- grid.7563.70000 0001 2174 1754School of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Francesca Turroni
- grid.10383.390000 0004 1758 0937Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy ,grid.10383.390000 0004 1758 0937Interdepartmental Research Centre Microbiome Research Hub, University of Parma, Parma, Italy
| | - Davide Mangioni
- grid.414818.00000 0004 1757 8749Present Address: Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy ,grid.4708.b0000 0004 1757 2822Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Guglielmo M. Migliorino
- grid.415025.70000 0004 1756 8604Infectious Diseases Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Christian Milani
- grid.10383.390000 0004 1758 0937Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy ,grid.10383.390000 0004 1758 0937Interdepartmental Research Centre Microbiome Research Hub, University of Parma, Parma, Italy
| | - Antonio Muscatello
- grid.414818.00000 0004 1757 8749Present Address: Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Giovanni Nattino
- grid.4527.40000000106678902Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Edoardo Picetti
- grid.411482.aDepartment of Anesthesia and Intensive Care, Parma University Hospital, Parma, Italy
| | - Riccardo Pinciroli
- grid.7563.70000 0001 2174 1754School of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Sandra Rossi
- grid.411482.aDepartment of Anesthesia and Intensive Care, Parma University Hospital, Parma, Italy
| | - Tommaso Tonetti
- grid.411482.aDepartment of Anesthesia and Intensive Care, Parma University Hospital, Parma, Italy
| | - Alessia Vargiolu
- grid.415025.70000 0004 1756 8604Neurointensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy ,grid.7563.70000 0001 2174 1754School of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Alessandra Bandera
- grid.414818.00000 0004 1757 8749Present Address: Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy ,grid.4708.b0000 0004 1757 2822Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Marco Ventura
- grid.10383.390000 0004 1758 0937Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy ,grid.10383.390000 0004 1758 0937Interdepartmental Research Centre Microbiome Research Hub, University of Parma, Parma, Italy
| | - Giuseppe Citerio
- grid.415025.70000 0004 1756 8604Neurointensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy ,grid.7563.70000 0001 2174 1754School of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Andrea Gori
- grid.414818.00000 0004 1757 8749Present Address: Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy ,grid.4708.b0000 0004 1757 2822Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
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Mousavi SE, Delgado-Saborit JM, Adivi A, Pauwels S, Godderis L. Air pollution and endocrine disruptors induce human microbiome imbalances: A systematic review of recent evidence and possible biological mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 816:151654. [PMID: 34785217 DOI: 10.1016/j.scitotenv.2021.151654] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 10/26/2021] [Accepted: 11/09/2021] [Indexed: 05/25/2023]
Abstract
A rich body of literature indicates that environmental factors interact with the human microbiome and influence its composition and functions contributing to the pathogenesis of diseases in distal sites of the body. This systematic review examines the scientific evidence on the effect of environmental toxicants, air pollutants and endocrine disruptors (EDCs), on compositional and diversity of human microbiota. Articles from PubMed, Embase, WoS and Google Scholar where included if they focused on human populations or the SHIME® model, and assessed the effects of air pollutants and EDCs on human microbiome. Non-human studies, not written in English and not displaying original research were excluded. The Newcastle-Ottawa Scale was used to assess the quality of individual studies. Results were extracted and presented in tables. 31 studies were selected, including 24 related to air pollutants, 5 related to EDCs, and 2 related to EDC using the SHIME® model. 19 studies focussed on the respiratory system (19), gut (8), skin (2), vaginal (1) and mammary (1) microbiomes. No sufficient number of studies are available to observe a consistent trend for most of the microbiota, except for streptococcus and veillionellales for which 9 out of 10, and 3 out of 4 studies suggest an increase of abundance with exposure to air pollution. A limitation of the evidence reviewed is the scarcity of existing studies assessing microbiomes from individual systems. Growing evidence suggests that exposure to environmental contaminants could change the diversity and abundance of resident microbiota, e.g. in the upper and lower respiratory, gastrointestinal, and female reproductive system. Microbial dysbiosis might lead to colonization of pathogens and outgrowth of pathobionts facilitating infectious diseases. It also might prime metabolic dysfunctions disrupting the production of beneficial metabolites. Further studies should elucidate the role of environmental pollutants in the development of dysbiosis and dysregulation of microbiota-related immunological processes.
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Affiliation(s)
- Sayed Esmaeil Mousavi
- Department of Water and Wastewater Treatment, Water and Wastewater Consulting Engineers (Design & Research), Isfahan, Iran
| | - Juana Maria Delgado-Saborit
- Perinatal Epidemiology, Environmental Health and Clinical Research, School of Medicine, Universitat Jaume I, Castellon, Spain; Environmental Research Group, MRC Centre for Environment and Health, Imperial College London, United Kingdom; School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
| | - Anna Adivi
- Advanced Environmental Research Institute, Department of Biological Sciences, University of North Texas, Denton, TX 76201, USA
| | - Sara Pauwels
- Department of Public Health and Primary Care, Centre Environment & Health, KU Leuven, Belgium
| | - Lode Godderis
- Department of Public Health and Primary Care, Centre Environment & Health, KU Leuven, Belgium; IDEWE, External Service for Prevention and Protection at work, Interleuvenlaan 58, 3001 Heverlee, Belgium.
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Yadav M, Chauhan NS. Overview of the rules of the microbial engagement in the gut microbiome: a step towards microbiome therapeutics. J Appl Microbiol 2020; 130:1425-1441. [PMID: 33022786 DOI: 10.1111/jam.14883] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/18/2020] [Accepted: 09/26/2020] [Indexed: 12/14/2022]
Abstract
Human gut microbiome is a diversified, resilient, immuno-stabilized, metabolically active and physiologically essential component of the human body. Scientific explorations have been made to seek in-depth information about human gut microbiome establishment, microbiome functioning, microbiome succession, factors influencing microbial community dynamics and the role of gut microbiome in health and diseases. Extensive investigations have proposed the microbiome therapeutics as a futuristic medicine for various physiological and metabolic disorders. A comprehensive outlook of microbial colonization, host-microbe interactions, microbial adaptation, commensal selection and immuno-survivability is still required to catalogue the essential genetic and physiological features for the commensal engagement. Evolution of a structured human gut microbiome relies on the microbial flexibility towards genetic, immunological and physiological adaptation in the human gut. Key features for commensalism could be utilized in developing tailor-made microbiome-based therapy to overcome various physiological and metabolic disorders. This review describes the key genetics and physiological traits required for host-microbe interaction and successful commensalism to institute a human gut microbiome.
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Affiliation(s)
- M Yadav
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, India
| | - N S Chauhan
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, India
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Khan R, Petersen FC, Shekhar S. Commensal Bacteria: An Emerging Player in Defense Against Respiratory Pathogens. Front Immunol 2019; 10:1203. [PMID: 31214175 PMCID: PMC6554327 DOI: 10.3389/fimmu.2019.01203] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 05/13/2019] [Indexed: 12/31/2022] Open
Abstract
A diverse community of trillions of commensal bacteria inhabits mucosal and epidermal surfaces in humans and plays an important role in defense against pathogens, including respiratory pathogens. Commensal bacteria act on the host's immune system to induce protective responses that prevent colonization and invasion by pathogens. On the other hand, these bacteria can directly inhibit the growth of respiratory pathogens by producing antimicrobial products/signals and competing for nutrients and adhesion sites. Such mechanisms preserve the niche for commensal bacteria and support the host in containing respiratory infections. Herein, we discuss current evidence on the role of commensal bacteria in conferring protection against respiratory pathogens and the underlying mechanisms by which these bacteria do so. A deeper knowledge of how commensal bacteria interact with the host and pathogens might provide new insights that are poised to aid in the development of vaccines and therapeutics that target infectious diseases.
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Affiliation(s)
- Rabia Khan
- Faculty of Dentistry, Institute of Oral Biology, University of Oslo, Oslo, Norway
| | | | - Sudhanshu Shekhar
- Faculty of Dentistry, Institute of Oral Biology, University of Oslo, Oslo, Norway
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