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Noszka M, Strzałka A, Muraszko J, Hofreuter D, Abele M, Ludwig C, Stingl K, Zawilak-Pawlik A. CemR atypical response regulator impacts energy conversion in Campylobacteria. mSystems 2024:e0078424. [PMID: 38980050 DOI: 10.1128/msystems.00784-24] [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: 06/09/2024] [Accepted: 06/12/2024] [Indexed: 07/10/2024] Open
Abstract
Campylobacter jejuni and Arcobacter butzleri are microaerobic food-borne human gastrointestinal pathogens that mainly cause diarrheal disease. These related species of the Campylobacteria class face variable atmospheric environments during infection and transmission, ranging from nearly anaerobic to aerobic conditions. Consequently, their lifestyles require that both pathogens need to adjust their metabolism and respiration to the changing oxygen concentrations of the colonization sites. Our transcriptomic and proteomic studies revealed that C. jejuni and A. butzleri, lacking a Campylobacteria-specific regulatory protein, C. jejuni Cj1608, or a homolog, A. butzleri Abu0127, are unable to reprogram tricarboxylic acid cycle or respiration pathways, respectively, to produce ATP efficiently and, in consequence, adjust growth to changing oxygen supply. We propose that these Campylobacteria energy and metabolism regulators (CemRs) are long-sought transcription factors controlling the metabolic shift related to oxygen availability, essential for these bacteria's survival and adaptation to the niches they inhabit. Besides their significant universal role in Campylobacteria, CemRs, as pleiotropic regulators, control the transcription of many genes, often specific to the species, under microaerophilic conditions and in response to oxidative stress. IMPORTANCE C. jejuni and A. butzleri are closely related pathogens that infect the human gastrointestinal tract. In order to infect humans successfully, they need to change their metabolism as nutrient and respiratory conditions change. A regulator called CemR has been identified, which helps them adapt their metabolism to changing conditions, particularly oxygen availability in the gastrointestinal tract so that they can produce enough energy for survival and spread. Without CemR, these bacteria, as well as a related species, Helicobacter pylori, produce less energy, grow more slowly, or, in the case of C. jejuni, do not grow at all. Furthermore, CemR is a global regulator that controls the synthesis of many genes in each species, potentially allowing them to adapt to their ecological niches as well as establish infection. Therefore, the identification of CemR opens new possibilities for studying the pathogenicity of C. jejuni and A. butzleri.
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Affiliation(s)
- Mateusz Noszka
- Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland
| | - Agnieszka Strzałka
- Department of Molecular Microbiology, Faculty of Biotechnology, University of Wrocław, Wrocław, Poland
| | - Jakub Muraszko
- Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland
| | - Dirk Hofreuter
- Department of Biological Safety, Unit of Product Hygiene and Disinfection Strategies, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Miriam Abele
- Bavarian Center for Biomolecular Mass Spectrometry (BayBioMS), Technical University of Munich (TUM), Freising, Germany
| | - Christina Ludwig
- Bavarian Center for Biomolecular Mass Spectrometry (BayBioMS), Technical University of Munich (TUM), Freising, Germany
| | - Kerstin Stingl
- Department of Biological Safety, National Reference Laboratory for Campylobacter, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Anna Zawilak-Pawlik
- Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland
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Kochanowsky R, Carothers K, Roxas BAP, Anwar F, Viswanathan VK, Vedantam G. Clostridioides difficile superoxide reductase mitigates oxygen sensitivity. J Bacteriol 2024:e0017524. [PMID: 38953644 DOI: 10.1128/jb.00175-24] [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: 04/24/2024] [Accepted: 06/12/2024] [Indexed: 07/04/2024] Open
Abstract
Clostridioides difficile causes a serious diarrheal disease and is a common healthcare-associated bacterial pathogen. Although it has a major impact on human health, the mechanistic details of C. difficile intestinal colonization remain undefined. C. difficile is highly sensitive to oxygen and requires anaerobic conditions for in vitro growth. However, the mammalian gut is not devoid of oxygen, and C. difficile tolerates moderate oxidative stress in vivo. The C. difficile genome encodes several antioxidant proteins, including a predicted superoxide reductase (SOR) that is upregulated upon exposure to antimicrobial peptides. The goal of this study was to establish SOR enzymatic activity and assess its role in protecting C. difficile against oxygen exposure. Insertional inactivation of sor rendered C. difficile more sensitive to superoxide, indicating that SOR contributes to antioxidant defense. Heterologous C. difficile sor expression in Escherichia coli conferred protection against superoxide-dependent growth inhibition, and the corresponding cell lysates showed superoxide scavenging activity. Finally, a C. difficile SOR mutant exhibited global proteome changes under oxygen stress when compared to the parent strain. Collectively, our data establish the enzymatic activity of C. difficile SOR, confirm its role in protection against oxidative stress, and demonstrate SOR's broader impacts on the C. difficile vegetative cell proteome.IMPORTANCEClostridioides difficile is an important pathogen strongly associated with healthcare settings and capable of causing severe diarrheal disease. While considered a strict anaerobe in vitro, C. difficile has been shown to tolerate low levels of oxygen in the mammalian host. Among other well-characterized antioxidant proteins, the C. difficile genome encodes a predicted superoxide reductase (SOR), an understudied component of antioxidant defense in pathogens. The significance of the research reported herein is the characterization of SOR's enzymatic activity, including confirmation of its role in protecting C. difficile against oxidative stress. This furthers our understanding of C. difficile pathogenesis and presents a potential new avenue for targeted therapies.
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Affiliation(s)
- Rebecca Kochanowsky
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
| | - Katelyn Carothers
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
| | - Bryan Angelo P Roxas
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
| | - Farhan Anwar
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
| | - V K Viswanathan
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
- BIO5 Institute for Collaborative Research, The University of Arizona, Tucson, Arizona, USA
| | - Gayatri Vedantam
- School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA
- BIO5 Institute for Collaborative Research, The University of Arizona, Tucson, Arizona, USA
- Southern Arizona VA Healthcare System, Tucson, Arizona, USA
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3
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Oladele P, Ngo J, Chang T, Johnson TA. Temporal dynamics of fecal microbiota community succession in broiler chickens, calves, and piglets under aerobic exposure. Microbiol Spectr 2024; 12:e0408423. [PMID: 38717193 DOI: 10.1128/spectrum.04084-23] [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: 11/30/2023] [Accepted: 04/16/2024] [Indexed: 06/06/2024] Open
Abstract
Researchers have extensively studied the effect of oxygen on the growth and survival of bacteria. However, the impact of oxygen on bacterial community structure, particularly its ability to select for taxa within the context of a complex microbial community, is still unclear. In a 21-day microcosm experiment, we investigated the effect of aerobic exposure on the fecal community structure and succession pattern in broiler, calf, and piglet feces (n = 10 for each feces type). Bacterial diversity decreased and community structure changed rapidly in the broiler microbiome (P < 0.001), while the fecal community of calves and piglets, which have higher initial diversity, was stable after initial exposure but decreased in diversity after 3 days (P < 0.001). The response to aerobic exposure was host animal specific, but in all three animals, the change in community structure was driven by a decrease in anaerobic species, primarily belonging to Firmicutes and Bacteroidetes (except in broilers where Bacteroidetes increased), along with an increase in aerobic species belonging to Proteobacteria and Actinobacteria. Using random forest regression, we identified microbial features that predict aerobic exposure. In all three animals, host-beneficial Prevotella-related ASVs decreased after exposure, while ASVs belonging to Acinetobacter, Corynbacterium, and Tissierella were increased. The decrease of Prevotella was rapid in broilers but delayed in calves and piglets. Knowing when these pathobionts increase in abundance after aerobic exposure could inform farm sanitation practices and could be important in designing animal experiments that modulate the microbiome.IMPORTANCEThe fecal microbial community is contained within a dynamic ecosystem of interacting microbes that varies in biotic and abiotic components across different animal species. Although oxygen affects bacterial growth, its specific impact on the structure of complex communities, such as those found in feces, and how these effects vary between different animal species are poorly understood. In this study, we demonstrate that the effect of aerobic exposure on the fecal microbiota was host-animal-specific, primarily driven by a decrease in Firmicutes and Bacteroidetes, but accompanied by an increase in Actinobacteria, Proteobacteria, and other pathobionts. Interestingly, we observed that more complex communities from pig and cattle exhibited initial resilience, while a less diverse community from broilers displayed a rapid response to aerobic exposure. Our findings offer insights that can inform farm sanitation practices, as well as experimental design, sample collection, and processing protocols for microbiome studies across various animal species.
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Affiliation(s)
- Paul Oladele
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Jennifer Ngo
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Tiffany Chang
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Timothy A Johnson
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA
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Haghebaert M, Laroche B, Sala L, Mondot S, Doré J. A mechanistic modelling approach of the host-microbiota interactions to investigate beneficial symbiotic resilience in the human gut. J R Soc Interface 2024; 21:20230756. [PMID: 38900957 DOI: 10.1098/rsif.2023.0756] [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: 12/18/2023] [Accepted: 04/11/2024] [Indexed: 06/22/2024] Open
Abstract
The health and well-being of a host are deeply influenced by the interactions with its gut microbiota. Contrasted environmental conditions, such as diseases or dietary habits, play a pivotal role in modulating these interactions, impacting microbiota composition and functionality. Such conditions can also lead to transitions from beneficial to detrimental symbiosis, viewed as alternative stable states of the host-microbiota dialogue. This article introduces a novel mathematical model exploring host-microbiota interactions, integrating dynamics of the colonic epithelial crypt, microbial metabolic functions, inflammation sensitivity and colon flows in a transverse section. The model considers metabolic shifts in epithelial cells based on butyrate and hydrogen sulfide concentrations, innate immune pattern recognition receptor activation, microbial oxygen tolerance and the impact of antimicrobial peptides on the microbiota. Using the model, we demonstrated that a high-protein, low-fibre diet exacerbates detrimental interactions and compromises beneficial symbiotic resilience, underscoring a destabilizing effect towards an unhealthy state. Moreover, the proposed model provides essential insights into oxygen levels, fibre and protein breakdown, and basic mechanisms of innate immunity in the colon and offers a crucial understanding of factors influencing the colon environment.
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Affiliation(s)
- Marie Haghebaert
- University Paris-Saclay, INRAE, MaIAGE , Jouy-en-Josas 78350, France
- University Paris-Saclay, INRIA, MUSCA , Palaiseau 91120, France
| | - Béatrice Laroche
- University Paris-Saclay, INRAE, MaIAGE , Jouy-en-Josas 78350, France
- University Paris-Saclay, INRIA, MUSCA , Palaiseau 91120, France
| | - Lorenzo Sala
- University Paris-Saclay, INRAE, MaIAGE , Jouy-en-Josas 78350, France
- University Paris-Saclay, INRIA, MUSCA , Palaiseau 91120, France
| | - Stanislas Mondot
- Micalis Institute, INRAE, AgroParisTech, University Paris-Saclay , Jouy-en-Josas 78350, France
| | - Joël Doré
- Micalis Institute, INRAE, AgroParisTech, University Paris-Saclay , Jouy-en-Josas 78350, France
- University Paris-Saclay, MGP, INRAE , Jouy-en-Josas 78350, France
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5
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Das A, Martinez-Ruiz GU, Bouladoux N, Stacy A, Moraly J, Vega-Sendino M, Zhao Y, Lavaert M, Ding Y, Morales-Sanchez A, Harly C, Seedhom MO, Chari R, Awasthi P, Ikeuchi T, Wang Y, Zhu J, Moutsopoulos NM, Chen W, Yewdell JW, Shapiro VS, Ruiz S, Taylor N, Belkaid Y, Bhandoola A. Transcription factor Tox2 is required for metabolic adaptation and tissue residency of ILC3 in the gut. Immunity 2024; 57:1019-1036.e9. [PMID: 38677292 PMCID: PMC11096055 DOI: 10.1016/j.immuni.2024.04.001] [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: 12/06/2023] [Revised: 02/13/2024] [Accepted: 04/03/2024] [Indexed: 04/29/2024]
Abstract
Group 3 innate lymphoid cells (ILC3) are the major subset of gut-resident ILC with essential roles in infections and tissue repair, but how they adapt to the gut environment to maintain tissue residency is unclear. We report that Tox2 is critical for gut ILC3 maintenance and function. Gut ILC3 highly expressed Tox2, and depletion of Tox2 markedly decreased ILC3 in gut but not at central sites, resulting in defective control of Citrobacter rodentium infection. Single-cell transcriptional profiling revealed decreased expression of Hexokinase-2 in Tox2-deficient gut ILC3. Consistent with the requirement for hexokinases in glycolysis, Tox2-/- ILC3 displayed decreased ability to utilize glycolysis for protein translation. Ectopic expression of Hexokinase-2 rescued Tox2-/- gut ILC3 defects. Hypoxia and interleukin (IL)-17A each induced Tox2 expression in ILC3, suggesting a mechanism by which ILC3 adjusts to fluctuating environments by programming glycolytic metabolism. Our results reveal the requirement for Tox2 to support the metabolic adaptation of ILC3 within the gastrointestinal tract.
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Affiliation(s)
- Arundhoti Das
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Gustavo Ulises Martinez-Ruiz
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA; Faculty of Medicine, Research Division, National Autonomous University of Mexico, Mexico City, Mexico; Children's Hospital of Mexico Federico Gomez, Mexico City, Mexico
| | - Nicolas Bouladoux
- Metaorganism Immunity Section, Laboratory of Host Immunity and Microbiome, NIAID, NIH, Bethesda, MD, USA
| | - Apollo Stacy
- Metaorganism Immunity Section, Laboratory of Host Immunity and Microbiome, NIAID, NIH, Bethesda, MD, USA; Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Josquin Moraly
- Pediatric Oncology Branch, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Maria Vega-Sendino
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Yongge Zhao
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Marieke Lavaert
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Yi Ding
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Abigail Morales-Sanchez
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA; Children's Hospital of Mexico Federico Gomez, Mexico City, Mexico
| | - Christelle Harly
- Université de Nantes, CNRS, Inserm, CRCINA, Nantes, France; LabEx IGO "Immunotherapy, Graft, Oncology," Nantes, France
| | - Mina O Seedhom
- Laboratory of Viral Diseases, NIAID, NIH, Bethesda, MD, USA
| | - Raj Chari
- Genome Modification Core, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Parirokh Awasthi
- Mouse Modeling Core, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Tomoko Ikeuchi
- Oral Immunity and Infection Section, NIDCR, NIH, Bethesda, MD, USA
| | - Yueqiang Wang
- Shenzhen Typhoon HealthCare, Shenzhen, Guangdong, China
| | - Jinfang Zhu
- Laboratory of Immune System Biology, NIAID, NIH, Bethesda, MD, USA
| | | | - WanJun Chen
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD, USA
| | | | | | - Sergio Ruiz
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA
| | - Naomi Taylor
- Pediatric Oncology Branch, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Yasmine Belkaid
- Metaorganism Immunity Section, Laboratory of Host Immunity and Microbiome, NIAID, NIH, Bethesda, MD, USA
| | - Avinash Bhandoola
- Laboratory of Genome Integrity, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA.
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Zhao H, Zhou Y, Xu J, Zhang Y, Wang H, Zhao C, Huang H, Yang J, Huang C, Li Y, Wang L, Nie Y. Short-chain fatty acid-producing bacterial strains attenuate experimental ulcerative colitis by promoting M2 macrophage polarization via JAK/STAT3/FOXO3 axis inactivation. J Transl Med 2024; 22:369. [PMID: 38637862 PMCID: PMC11025230 DOI: 10.1186/s12967-024-05122-w] [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: 12/12/2023] [Accepted: 03/20/2024] [Indexed: 04/20/2024] Open
Abstract
BACKGROUND Patients with inflammatory bowel disease (IBD), dysbiosis, and immunosuppression who receive fecal microbiota transplantation (FMT) from healthy donors are at an increased risk of developing bacteremia. This study investigates the efficacy of a mixture of seven short-chain fatty acid (SCFA)-producing bacterial strains (7-mix), the resulting culture supernatant mixture (mix-sup), and FMT for treating experimental ulcerative colitis (UC) and evaluates underlying mechanisms. METHODS Utilizing culturomics, we isolated and cultured SCFA-producing bacteria from the stool of healthy donors. We used a mouse model of acute UC induced by dextran sulfate sodium (DSS) to assess the effects of 7-mix, mix-sup, and FMT on intestinal inflammation and barrier function, microbial abundance and diversity, and gut macrophage polarization by flow cytometry, immunohistochemistry, 16S rRNA gene sequencing, and transwell assays. RESULTS The abundance of several SCFA-producing bacterial taxa decreased in patients with UC. Seven-mix and mix-sup suppressed the inflammatory response and enhanced intestinal mucosal barrier function in the mouse model of UC to an extent similar to or superior to that of FMT. Moreover, 7-mix and mix-sup increased the abundance of SCFA-producing bacteria and SCFA concentrations in colitic mice. The effects of these interventions on the inflammatory response and gut barrier function were mediated by JAK/STAT3/FOXO3 axis inactivation in macrophages by inducing M2 macrophage polarization in vivo and in vitro. CONCLUSIONS Our approach provides new opportunities to rationally harness live gut probiotic strains and metabolites to reduce intestinal inflammation, restore gut microbial composition, and expedite the development of safe and effective treatments for IBD.
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Affiliation(s)
- Hailan Zhao
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
- Department of Gastroenterology, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University; The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, 518020, China
- The First Affiliated Hospital, Jinan University, Guangzhou, 510630, China
| | - Youlian Zhou
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Jing Xu
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Yong Zhang
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Hong Wang
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Chong Zhao
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Hongli Huang
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Jing Yang
- Department of Pathology, Guangzhou First People's Hospital, Guangzhou, 510180, China
| | - Chen Huang
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Yingfei Li
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Lisheng Wang
- Department of Gastroenterology, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University; The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, 518020, China.
| | - Yuqiang Nie
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital, the Second Affiliated Hospital, School of Medicine, South China University of Technology, Guangzhou, 510006, China.
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7
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Olczak T, Śmiga M, Antonyuk SV, Smalley JW. Hemophore-like proteins of the HmuY family in the oral and gut microbiome: unraveling the mystery of their evolution. Microbiol Mol Biol Rev 2024; 88:e0013123. [PMID: 38305743 PMCID: PMC10966948 DOI: 10.1128/mmbr.00131-23] [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] [Indexed: 02/03/2024] Open
Abstract
SUMMARY Heme (iron protoporphyrin IX, FePPIX) is the main source of iron and PPIX for host-associated pathogenic bacteria, including members of the Bacteroidota (formerly Bacteroidetes) phylum. Porphyromonas gingivalis, a keystone oral pathogen, uses a unique heme uptake (Hmu) system, comprising a hemophore-like protein, designated as the first member of the novel HmuY family. Compared to classical, secreted hemophores utilized by Gram-negative bacteria or near-iron transporter domain-based hemophores utilized by Gram-positive bacteria, the HmuY family comprises structurally similar proteins that have undergone diversification during evolution. The best characterized are P. gingivalis HmuY and its homologs from Tannerella forsythia (Tfo), Prevotella intermedia (PinO and PinA), Bacteroides vulgatus (Bvu), and Bacteroides fragilis (BfrA, BfrB, and BfrC). In contrast to the two histidine residues coordinating heme iron in P. gingivalis HmuY, Tfo, PinO, PinA, Bvu, and BfrA preferentially use two methionine residues. Interestingly, BfrB, despite conserved methionine residue, binds the PPIX ring without iron coordination. BfrC binds neither heme nor PPIX in keeping with the lack of conserved histidine or methionine residues used by other members of the HmuY family. HmuY competes for heme binding and heme sequestration from host hemoproteins with other members of the HmuY family to increase P. gingivalis competitiveness. The participation of HmuY in the host immune response confirms its relevance in relation to the survival of P. gingivalis and its ability to induce dysbiosis not only in the oral microbiome but also in the gut microbiome or other host niches, leading to local injuries and involvement in comorbidities.
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Affiliation(s)
- Teresa Olczak
- Laboratory of Medical Biology, Faculty of Biotechnology, University of Wrocław, Wrocław, Poland
| | - Michał Śmiga
- Laboratory of Medical Biology, Faculty of Biotechnology, University of Wrocław, Wrocław, Poland
| | - Svetlana V. Antonyuk
- Molecular Biophysics Group, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, the University of Liverpool, Liverpool, United Kingdom
| | - John W. Smalley
- Institute of Life Course and Medical Sciences, School of Dentistry, the University of Liverpool, Liverpool, United Kingdom
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8
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Delong LM, Witt CE, Pennell M, Ross AE. A microfluidic chip for sustained oxygen gradient formation in the intestine ex vivo. LAB ON A CHIP 2024; 24:1918-1929. [PMID: 38372633 PMCID: PMC10998727 DOI: 10.1039/d3lc00793f] [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] [Indexed: 02/20/2024]
Abstract
The oxygen gradient across the intestine influences intestinal physiology and the microbial environment of the microbiome. The microbiome releases metabolites that communicate with enterochromaffin cells, neuronal cells, and resident immune cells to facilitate the bidirectional communication across the gut-brain axis. Measuring communication between various cell types within the intestine could provide essential information about key regulators of gut and brain health; however, the microbial environment of the intestine is heavily dependent on the physiological oxygen gradient that exists across the intestinal wall. Likewise, there exist a need for methods which enable real-time monitoring of intestinal signaling ex vivo yet this remains challenging due to the inability to adequately culture intestinal tissue ex vivo while also exposing the appropriate locations of the intestine for probe insertion and monitoring. Here, we designed and fabricated a 3D printed microfluidic device to maintain the oxygen gradient across precision cut murine intestinal slices with the capability to couple to external neurochemical recording techniques. The gradient is maintained from outlets below while allowing access to the slice from above for detection with fast scan cyclic voltammetry (FSCV) and carbon-fiber microelectrodes. A series of 11 outlet ports were designed to lay underneath the slice which were connected to channels to deliver oxygenated vs. deoxygenated media. Outlet ports were designed in an oval shape where deoxygenated media was delivered to the center of the slice and oxygenated media is delivered to the outer portion of the slice to mimic the location of oxygen across the intestine. An oxygen sensitive fluorescent dye, tris(2,2'-bipyridyl)dichlororuthenium(II), was used to characterize the tunability of the gradient. Viability of the tissue was confirmed by both fluorescence microscopy and FSCV. Additionally, we measured simultaneous serotonin and melatonin signaling with FSCV in the intestine for the first time. Overall, this chip provides a significant advance in our ability to culture intestinal slices ex vivo with the added benefit of direct access for measurements and imaging.
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Affiliation(s)
- Lauren M Delong
- Department of Chemistry, University of Cincinnati, 312 College Dr., 404 Crosley Tower, Cincinnati, OH 45221-0172, USA.
| | - Colby E Witt
- Department of Chemistry, University of Cincinnati, 312 College Dr., 404 Crosley Tower, Cincinnati, OH 45221-0172, USA.
| | - Madison Pennell
- Department of Chemistry, University of Cincinnati, 312 College Dr., 404 Crosley Tower, Cincinnati, OH 45221-0172, USA.
| | - Ashley E Ross
- Department of Chemistry, University of Cincinnati, 312 College Dr., 404 Crosley Tower, Cincinnati, OH 45221-0172, USA.
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9
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Moreira de Gouveia MI, Bernalier-Donadille A, Jubelin G. Enterobacteriaceae in the Human Gut: Dynamics and Ecological Roles in Health and Disease. BIOLOGY 2024; 13:142. [PMID: 38534413 DOI: 10.3390/biology13030142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/08/2024] [Accepted: 02/21/2024] [Indexed: 03/28/2024]
Abstract
The human gut microbiota plays a crucial role in maintaining host health. Our review explores the prevalence and dynamics of Enterobacteriaceae, a bacterial family within the Proteobacteria phylum, in the human gut which represents a small fraction of the gut microbiota in healthy conditions. Even though their roles are not yet fully understood, Enterobacteriaceae and especially Escherichia coli (E. coli) play a part in creating an anaerobic environment, producing vitamins and protecting against pathogenic infections. The composition and residency of E. coli strains in the gut fluctuate among individuals and is influenced by many factors such as geography, diet and health. Dysbiosis, characterized by alterations in the microbial composition of the gut microbiota, is associated with various diseases, including obesity, inflammatory bowel diseases and metabolic disorders. A consistent pattern in dysbiosis is the expansion of Proteobacteria, particularly Enterobacteriaceae, which has been proposed as a potential marker for intestinal and extra-intestinal inflammatory diseases. Here we develop the potential mechanisms contributing to Enterobacteriaceae proliferation during dysbiosis, including changes in oxygen levels, alterations in mucosal substrates and dietary factors. Better knowledge of these mechanisms is important for developing strategies to restore a balanced gut microbiota and reduce the negative consequences of the Enterobacteriaceae bloom.
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Affiliation(s)
| | | | - Gregory Jubelin
- Université Clermont Auvergne, INRAE, MEDIS UMR454, F-63000 Clermont-Ferrand, France
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10
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Abstract
Biogeography is the study of species distribution and diversity within an ecosystem and is at the core of how we understand ecosystem dynamics and interactions at the macroscale. In gut microbial communities, a historical reliance on bulk sequencing to probe community composition and dynamics has overlooked critical processes whereby microscale interactions affect systems-level microbiota function and the relationship with the host. In recent years, higher-resolution sequencing and novel single-cell level data have uncovered an incredible heterogeneity in microbial composition and have enabled a more nuanced spatial understanding of the gut microbiota. In an era when spatial transcriptomics and single-cell imaging and analysis have become key tools in mammalian cell and tissue biology, many of these techniques are now being applied to the microbiota. This fresh approach to intestinal biogeography has given important insights that span temporal and spatial scales, from the discovery of mucus encapsulation of the microbiota to the quantification of bacterial species throughout the gut. In this Review, we highlight emerging knowledge surrounding gut biogeography enabled by the observation and quantification of heterogeneity across multiple scales.
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Affiliation(s)
- Giselle McCallum
- Department of Biology, Concordia University, Montreal, Quebec, Canada
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Carolina Tropini
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, Canada.
- School of Biomedical Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
- Humans and the Microbiome Program, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario, Canada.
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11
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Bouges E, Segers C, Leys N, Lebeer S, Zhang J, Mastroleo F. Human Intestinal Organoids and Microphysiological Systems for Modeling Radiotoxicity and Assessing Radioprotective Agents. Cancers (Basel) 2023; 15:5859. [PMID: 38136404 PMCID: PMC10741417 DOI: 10.3390/cancers15245859] [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: 11/16/2023] [Revised: 12/08/2023] [Accepted: 12/13/2023] [Indexed: 12/24/2023] Open
Abstract
Radiotherapy is a commonly employed treatment for colorectal cancer, yet its radiotoxicity-related impact on healthy tissues raises significant health concerns. This highlights the need to use radioprotective agents to mitigate these side effects. This review presents the current landscape of human translational radiobiology, outlining the limitations of existing models and proposing engineering solutions. We delve into radiotherapy principles, encompassing mechanisms of radiation-induced cell death and its influence on normal and cancerous colorectal cells. Furthermore, we explore the engineering aspects of microphysiological systems to represent radiotherapy-induced gastrointestinal toxicity and how to include the gut microbiota to study its role in treatment failure and success. This review ultimately highlights the main challenges and future pathways in translational research for pelvic radiotherapy-induced toxicity. This is achieved by developing a humanized in vitro model that mimics radiotherapy treatment conditions. An in vitro model should provide in-depth analyses of host-gut microbiota interactions and a deeper understanding of the underlying biological mechanisms of radioprotective food supplements. Additionally, it would be of great value if these models could produce high-throughput data using patient-derived samples to address the lack of human representability to complete clinical trials and improve patients' quality of life.
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Affiliation(s)
- Eloïse Bouges
- RadioPharma Research, Nuclear Medical Applications, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400 Mol, Belgium; (E.B.); (C.S.); (N.L.)
- Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;
- Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands;
| | - Charlotte Segers
- RadioPharma Research, Nuclear Medical Applications, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400 Mol, Belgium; (E.B.); (C.S.); (N.L.)
| | - Natalie Leys
- RadioPharma Research, Nuclear Medical Applications, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400 Mol, Belgium; (E.B.); (C.S.); (N.L.)
| | - Sarah Lebeer
- Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;
| | - Jianbo Zhang
- Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands;
- Tytgat Institute for Liver and Intestinal Research, Amsterdam Gastroenterology, Endocrinology and Metabolism, Amsterdam UMC, Location Academic Medical Center, 1105 BK Amsterdam, The Netherlands
| | - Felice Mastroleo
- RadioPharma Research, Nuclear Medical Applications, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400 Mol, Belgium; (E.B.); (C.S.); (N.L.)
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12
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Lebovich M, Zeng M, Andrews LB. Algorithmic Programming of Sequential Logic and Genetic Circuits for Recording Biochemical Concentration in a Probiotic Bacterium. ACS Synth Biol 2023; 12:2632-2649. [PMID: 37581922 PMCID: PMC10510703 DOI: 10.1021/acssynbio.3c00232] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Indexed: 08/16/2023]
Abstract
Through the implementation of designable genetic circuits, engineered probiotic microorganisms could be used as noninvasive diagnostic tools for the gastrointestinal tract. For these living cells to report detected biomarkers or signals after exiting the gut, the genetic circuits must be able to record these signals by using genetically encoded memory. Complex memory register circuits could enable multiplex interrogation of biomarkers and signals. A theory-based approach to create genetic circuits containing memory, known as sequential logic circuits, was previously established for a model laboratory strain of Escherichia coli, yet how circuit component performance varies for nonmodel and clinically relevant bacterial strains is poorly understood. Here, we develop a scalable computational approach to design robust sequential logic circuits in probiotic strain Escherichia coli Nissle 1917 (EcN). In this work, we used TetR-family transcriptional repressors to build genetic logic gates that can be composed into sequential logic circuits, along with a set of engineered sensors relevant for use in the gut environment. Using standard methods, 16 genetic NOT gates and nine sensors were experimentally characterized in EcN. These data were used to design and predict the performance of circuit designs. We present a set of genetic circuits encoding both combinational logic and sequential logic and show that the circuit outputs are in close agreement with our quantitative predictions from the design algorithm. Furthermore, we demonstrate an analog-like concentration recording circuit that detects and reports three input concentration ranges of a biochemical signal using sequential logic.
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Affiliation(s)
- Matthew Lebovich
- Department
of Chemical Engineering, University of Massachusetts
Amherst, Amherst, Massachusetts 01003, United States
- Biotechnology
Training Program, University of Massachusetts
Amherst, Amherst, Massachusetts 01003, United States
| | - Min Zeng
- Department
of Chemical Engineering, University of Massachusetts
Amherst, Amherst, Massachusetts 01003, United States
| | - Lauren B. Andrews
- Department
of Chemical Engineering, University of Massachusetts
Amherst, Amherst, Massachusetts 01003, United States
- Biotechnology
Training Program, University of Massachusetts
Amherst, Amherst, Massachusetts 01003, United States
- Molecular
and Cellular Biology Graduate Program, University
of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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13
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Wu Z, Nguyen D, Shrestha S, Raskin L, Khanal SK, Lee PH. Evaluation of Nanaerobic Digestion as a Mechanism to Explain Surplus Methane Production in Animal Rumina and Engineered Digesters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:12302-12314. [PMID: 37565790 PMCID: PMC10448717 DOI: 10.1021/acs.est.2c07813] [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: 10/28/2022] [Revised: 07/02/2023] [Accepted: 07/20/2023] [Indexed: 08/12/2023]
Abstract
Nanaerobes are a newly described class of microorganisms that use a unique cytochrome bd oxidase to achieve nanaerobic respiration at <2 μM dissolved oxygen (∼1% of atmospheric oxygen) but are not viable above this value due to the lack of other terminal oxidases. Although sharing an overlapping ecological niche with methanogenic archaea, the role of nanaerobes in methanogenic systems has not been studied so far. To explore their occurrence and significance, we re-analyzed published meta-omic datasets from animal rumina and waste-to-energy digesters, including conventional anaerobic digesters and anaerobic digesters with ultra-low oxygenation. Results show that animal rumina share broad similarities in the microbial community and system performance with oxygenated digesters, rather than with conventional anaerobic digesters, implying that trace levels of oxygen drive the efficient digestion in ruminants. The rumen system serves as an ideal model for the newly named nanaerobic digestion, as it relies on the synergistic co-occurrence of nanaerobes and methanogens for methane yield enhancement. The most abundant ruminal bacterial family Prevotellaceae contains many nanaerobes, which perform not only anaerobic fermentation but also nanaerobic respiration using cytochrome bd oxidase. These nanaerobes generally accompany hydrogenotrophic methanogens to constitute a thermodynamically and physiologically consistent framework for efficient methane generation. Our findings provide new insights into ruminal methane emissions and strategies to enhance methane generation from biomass.
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Affiliation(s)
- Zhuoying Wu
- Department
of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United
Kingdom
- Shanghai
Shaanxi Coal Hi-tech Research Institute Co., Ltd., Shanghai 201613, China
| | - Duc Nguyen
- Department
of Molecular Biosciences and Bioengineering, University of Hawai’i at Ma̅noa, Honolulu 96822, Hawaii, United States
- The
Lyell Centre, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Shilva Shrestha
- Department
of Civil and Environmental Engineering, University of Michigan, 1351 Beal Avenue, 107 EWRE Building, Ann Arbor 48109, Michigan, United States
- Joint
BioEnergy Institute, Emeryville, California 94608, United States
- Biological
Systems and Engineering Division, Lawrence
Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Lutgarde Raskin
- Department
of Civil and Environmental Engineering, University of Michigan, 1351 Beal Avenue, 107 EWRE Building, Ann Arbor 48109, Michigan, United States
| | - Samir Kumar Khanal
- Department
of Molecular Biosciences and Bioengineering, University of Hawai’i at Ma̅noa, Honolulu 96822, Hawaii, United States
| | - Po-Heng Lee
- Department
of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United
Kingdom
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14
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Rivera KR, Bliton RJ, Burclaff J, Czerwinski MJ, Liu J, Trueblood JM, Hinesley CM, Breau KA, Deal HE, Joshi S, Pozdin VA, Yao M, Ziegler AL, Blikslager AT, Daniele MA, Magness ST. Hypoxia Primes Human ISCs for Interleukin-Dependent Rescue of Stem Cell Activity. Cell Mol Gastroenterol Hepatol 2023; 16:823-846. [PMID: 37562653 PMCID: PMC10520368 DOI: 10.1016/j.jcmgh.2023.07.012] [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] [Received: 02/13/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/12/2023]
Abstract
BACKGROUND AND AIMS Hypoxia in the intestinal epithelium can be caused by acute ischemic events or chronic inflammation in which immune cell infiltration produces inflammatory hypoxia starving the mucosa of oxygen. The epithelium has the capacity to regenerate after some ischemic and inflammatory conditions suggesting that intestinal stem cells (ISCs) are highly tolerant to acute and chronic hypoxia; however, the impact of hypoxia on human ISC (hISC) function has not been reported. Here we present a new microphysiological system (MPS) to investigate how hypoxia affects hISCs from healthy donors and test the hypothesis that prolonged hypoxia modulates how hISCs respond to inflammation-associated interleukins (ILs). METHODS hISCs were exposed to <1.0% oxygen in the MPS for 6, 24, 48, and 72 hours. Viability, hypoxia-inducible factor 1a (HIF1a) response, transcriptomics, cell cycle dynamics, and response to cytokines were evaluated in hISCs under hypoxia. HIF stabilizers and inhibitors were screened to evaluate HIF-dependent responses. RESULTS The MPS enables precise, real-time control and monitoring of oxygen levels at the cell surface. Under hypoxia, hISCs maintain viability until 72 hours and exhibit peak HIF1a at 24 hours. hISC activity was reduced at 24 hours but recovered at 48 hours. Hypoxia induced increases in the proportion of hISCs in G1 and expression changes in 16 IL receptors. Prolyl hydroxylase inhibition failed to reproduce hypoxia-dependent IL-receptor expression patterns. hISC activity increased when treated IL1β, IL2, IL4, IL6, IL10, IL13, and IL25 and rescued hISC activity caused by 24 hours of hypoxia. CONCLUSIONS Hypoxia pushes hISCs into a dormant but reversible proliferative state and primes hISCs to respond to a subset of ILs that preserves hISC activity. These findings have important implications for understanding intestinal epithelial regeneration mechanisms caused by inflammatory hypoxia.
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Affiliation(s)
- Kristina R Rivera
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina
| | - R Jarrett Bliton
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina
| | - Joseph Burclaff
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina
| | - Michael J Czerwinski
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jintong Liu
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jessica M Trueblood
- Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Caroline M Hinesley
- Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Keith A Breau
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Halston E Deal
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina
| | - Shlok Joshi
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Vladimir A Pozdin
- Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina
| | - Ming Yao
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina
| | - Amanda L Ziegler
- Comparative Medicine Institute, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Anthony T Blikslager
- Comparative Medicine Institute, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Michael A Daniele
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina; Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina
| | - Scott T Magness
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, North Carolina; Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
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15
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Botin T, Ramirez-Chamorro L, Vidic J, Langella P, Martin-Verstraete I, Chatel JM, Auger S. The Tolerance of Gut Commensal Faecalibacterium to Oxidative Stress Is Strain Dependent and Relies on Detoxifying Enzymes. Appl Environ Microbiol 2023; 89:e0060623. [PMID: 37382539 PMCID: PMC10370306 DOI: 10.1128/aem.00606-23] [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: 04/12/2023] [Accepted: 06/12/2023] [Indexed: 06/30/2023] Open
Abstract
Obligate anaerobic bacteria in genus Faecalibacterium are among the most dominant taxa in the colon of healthy individuals and contribute to intestinal homeostasis. A decline in the abundance of this genus is associated with the occurrence of various gastrointestinal disorders, including inflammatory bowel diseases. In the colon, these diseases are accompanied by an imbalance between the generation and elimination of reactive oxygen species (ROS), and oxidative stress is closely linked to disruptions in anaerobiosis. In this work, we explored the impact of oxidative stress on several strains of faecalibacteria. An in silico analysis of complete genomes of faecalibacteria revealed the presence of genes encoding O2- and/or ROS-detoxifying enzymes, including flavodiiron proteins, rubrerythrins, reverse rubrerythrins, superoxide reductases, and alkyl peroxidase. However, the presence and the number of these detoxification systems varied greatly among faecalibacteria. These results were confirmed by O2 stress survival tests, in which we found that strains differed widely in their sensitivity. We showed the protective role of cysteine, which limited the production of extracellular O2•- and improved the survival of Faecalibacterium longum L2-6 under high O2 tension. In the strain F. longum L2-6, we observed that the expression of genes encoding detoxifying enzymes was upregulated in the response to O2 or H2O2 stress but with different patterns of regulation. Based on these results, we propose a first model of the gene regulatory network involved in the response to oxidative stress in F. longum L2-6. IMPORTANCE Commensal bacteria in the genus Faecalibacterium have been proposed for use as next-generation probiotics, but efforts to cultivate and exploit the potential of these strains have been limited by their sensitivity to O2. More broadly, little is known about how commensal and health-associated bacterial species in the human microbiome respond to the oxidative stress that occurs as a result of inflammation in the colon. In this work, we provide insights regarding the genes that encode potential mechanisms of protection against O2 or ROS stress in faecalibacteria, which may facilitate future advances in work with these important bacteria.
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Affiliation(s)
- Tatiana Botin
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
| | - Luis Ramirez-Chamorro
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
| | - Jasmina Vidic
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
| | - Philippe Langella
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
| | - Isabelle Martin-Verstraete
- Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Laboratoire Pathogénèse des Bactéries Anaérobies, Paris, France
- Institut Universitaire de France, Paris, France
| | - Jean-Marc Chatel
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
| | - Sandrine Auger
- Université Paris Saclay, INRAE, AgroParisTech, UMR1319, MICALIS, Jouy-en-Josas, France
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16
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Yang W, Zhang X, Sun M, Jiao Y, Li X, Liu L, Wang Z. The Peptide Fractions of Cheddar Cheese Made with Lactobacillus helveticus 1.0612 Play Protective Effects in H 2O 2-Induced Oxidative-Damaged Caco-2 Cells Models. Foods 2023; 12:2790. [PMID: 37509882 PMCID: PMC10379991 DOI: 10.3390/foods12142790] [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: 06/27/2023] [Revised: 07/16/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
In this study, water-soluble peptide (WSP) fractions of cheddar cheese made with Lactobacillus helveticus 1.0612 were purified into WSP-Ⅰ (<3 kDa), WSP-Ⅱ (3-10 kDa), and WSP-Ⅲ (>10 kDa). The protective effects of WSP, WSP-Ⅰ, WSP-Ⅱ, and WSP-Ⅲ fractions against oxidative stress in Caco-2 cells were assayed, and the cytoprotective mechanism of WSP-Ⅰ on cells oxidative damage was elucidated via metabolomics. The results showed that all four peptide fractions were able to attenuate the decrease in cell viability caused by oxidative stress and also could reduce the production of reactive oxygen species and malondialdehyde caused by oxidative stress, and increased cellular catalase and superoxide dismutase activities, thereby enhancing cellular antioxidant capacity. The WSP-Ⅰ fraction with the highest protective effect was used for metabolomics analysis, and 15 significantly different metabolites were screened. Functional pathway analysis revealed that the protective effect of the WSP-I fraction was related with nine metabolic pathways and weakened the metabolic disorders caused by H2O2 via regulating energy metabolism and amino acid metabolism. All in all, peptide fractions of cheddar cheese showed a cytoprotective effect through improved cellular metabolism.
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Affiliation(s)
- Wanshuang Yang
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Xiuxiu Zhang
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Meng Sun
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Yang Jiao
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Xiaodong Li
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Lu Liu
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
| | - Zhong Wang
- College of Food Science, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, No. 600 Changjiang St., Xiangfang Dist., Harbin 150030, China
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17
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Casanova-Maldonado I, Arancibia D, Lois P, Peña-Villalobos I, Palma V. Hyperbaric oxygen treatment increases intestinal stem cell proliferation through the mTORC1/S6K1 signaling pathway in Mus musculus. Biol Res 2023; 56:41. [PMID: 37438828 DOI: 10.1186/s40659-023-00444-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 06/05/2023] [Indexed: 07/14/2023] Open
Abstract
BACKGROUND Hyperbaric oxygen treatment (HBOT) has been reported to modulate the proliferation of neural and mesenchymal stem cell populations, but the molecular mechanisms underlying these effects are not completely understood. In this study, we aimed to assess HBOT somatic stem cell modulation by evaluating the role of the mTOR complex 1 (mTORC1), a key regulator of cell metabolism whose activity is modified depending on oxygen levels, as a potential mediator of HBOT in murine intestinal stem cells (ISCs). RESULTS We discovered that acute HBOT synchronously increases the proliferation of ISCs without affecting the animal's oxidative metabolism through activation of the mTORC1/S6K1 axis. mTORC1 inhibition by rapamycin administration for 20 days also increases ISCs proliferation, generating a paradoxical response in mice intestines, and has been proposed to mimic a partial starvation state. Interestingly, the combination of HBOT and rapamycin does not have a synergic effect, possibly due to their differential impact on the mTORC1/S6K1 axis. CONCLUSIONS HBOT can induce an increase in ISCs proliferation along with other cell populations within the crypt through mTORC1/S6K1 modulation without altering the oxidative metabolism of the animal's small intestine. These results shed light on the molecular mechanisms underlying HBOT therapeutic action, laying the groundwork for future studies.
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Affiliation(s)
- Ignacio Casanova-Maldonado
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, Universidad de Chile, Las Encinas 3370, Milenio Building Floor 3, 7800024, Santiago de Chile, Nunoa, Chile.
| | - David Arancibia
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, Universidad de Chile, Las Encinas 3370, Milenio Building Floor 3, 7800024, Santiago de Chile, Nunoa, Chile
| | - Pablo Lois
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, Universidad de Chile, Las Encinas 3370, Milenio Building Floor 3, 7800024, Santiago de Chile, Nunoa, Chile
- Education Department, Faculty of Humanities, Universidad Mayor, Santiago de Chile, Providencia, Chile
| | - Isaac Peña-Villalobos
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, Universidad de Chile, Las Encinas 3370, Milenio Building Floor 3, 7800024, Santiago de Chile, Nunoa, Chile.
| | - Verónica Palma
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, Universidad de Chile, Las Encinas 3370, Milenio Building Floor 3, 7800024, Santiago de Chile, Nunoa, Chile.
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18
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Wang Y, Song Y, Yan S, Hiramine R, Ohnishi Y, Yokoi Y, Nakamura K, Kikukawa T, Ayabe T, Aizawa T. Antimicrobial Properties and Mode of Action of Cryptdin-4, a Mouse α-Defensin Regulated by Peptide Redox Structures and Bacterial Cultivation Conditions. Antibiotics (Basel) 2023; 12:1047. [PMID: 37370366 DOI: 10.3390/antibiotics12061047] [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: 05/13/2023] [Revised: 06/10/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Cryptdin-4 (crp4) is an enteric α-defensin derived from mice, and is a main mediator of immunity to oral infections and a determinant of the composition of the intestinal microbiota. Structurally, crp4 exists in two states: the oxidized form (crp4oxi), constrained by three invariant disulfide bonds, and the reduced form (crp4red) with six free thiol groups, both of which exist in the intestinal tract. In this study, the antibacterial mechanisms of crp4 in both forms under aerobic and anaerobic conditions were investigated using Escherichia coli (E. coli), an anaerobic facultative bacterium, as a model. Fluorescent dye studies revealed that both crp4oxi and crp4red exhibited antimicrobial activity against cells cultured under aerobic conditions via rapid membrane depolarization. Furthermore, the antioxidant treatment experiments suggested that only crp4oxi exhibited antimicrobial activity by the induction and accumulation of reactive oxygen species (ROS). However, under anaerobic culture conditions, the ability of both forms to disrupt the function of bacterial membranes decreased and activity was greatly reduced, but crp4red maintained some antimicrobial activity. This activity may be due to the inhibition of intracellular functions by DNA binding. Altogether, these data indicate that, according to its redox structure and the environmental redox conditions, crp4 could perform different antimicrobial activities via different mechanisms.
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Affiliation(s)
- Yi Wang
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yuchi Song
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Shaonan Yan
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Rina Hiramine
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yuki Ohnishi
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yuki Yokoi
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Sapporo 060-0808, Japan
| | - Kiminori Nakamura
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Sapporo 060-0808, Japan
| | - Takashi Kikukawa
- Laboratory of Biological Information Analysis Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0808, Japan
| | - Tokiyoshi Ayabe
- Innate Immunity Laboratory, Graduate School of Life Science, Hokkaido University, Sapporo 060-0808, Japan
| | - Tomoyasu Aizawa
- Laboratory of Protein Science, Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan
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19
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Lv R, Liu X, Zhang Y, Dong N, Wang X, He Y, Yue H, Yin Q. Pathophysiological mechanisms and therapeutic approaches in obstructive sleep apnea syndrome. Signal Transduct Target Ther 2023; 8:218. [PMID: 37230968 DOI: 10.1038/s41392-023-01496-3] [Citation(s) in RCA: 46] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 05/09/2023] [Accepted: 05/11/2023] [Indexed: 05/27/2023] Open
Abstract
Obstructive sleep apnea syndrome (OSAS) is a common breathing disorder in sleep in which the airways narrow or collapse during sleep, causing obstructive sleep apnea. The prevalence of OSAS continues to rise worldwide, particularly in middle-aged and elderly individuals. The mechanism of upper airway collapse is incompletely understood but is associated with several factors, including obesity, craniofacial changes, altered muscle function in the upper airway, pharyngeal neuropathy, and fluid shifts to the neck. The main characteristics of OSAS are recurrent pauses in respiration, which lead to intermittent hypoxia (IH) and hypercapnia, accompanied by blood oxygen desaturation and arousal during sleep, which sharply increases the risk of several diseases. This paper first briefly describes the epidemiology, incidence, and pathophysiological mechanisms of OSAS. Next, the alterations in relevant signaling pathways induced by IH are systematically reviewed and discussed. For example, IH can induce gut microbiota (GM) dysbiosis, impair the intestinal barrier, and alter intestinal metabolites. These mechanisms ultimately lead to secondary oxidative stress, systemic inflammation, and sympathetic activation. We then summarize the effects of IH on disease pathogenesis, including cardiocerebrovascular disorders, neurological disorders, metabolic diseases, cancer, reproductive disorders, and COVID-19. Finally, different therapeutic strategies for OSAS caused by different causes are proposed. Multidisciplinary approaches and shared decision-making are necessary for the successful treatment of OSAS in the future, but more randomized controlled trials are needed for further evaluation to define what treatments are best for specific OSAS patients.
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Affiliation(s)
- Renjun Lv
- The First School of Clinical Medicine, Lanzhou University, Lanzhou, 730000, China
| | - Xueying Liu
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, 250021, China
| | - Yue Zhang
- Department of Geriatrics, the 2nd Medical Center, Chinese PLA General Hospital, Beijing, 100853, China
| | - Na Dong
- The First School of Clinical Medicine, Lanzhou University, Lanzhou, 730000, China
| | - Xiao Wang
- The First School of Clinical Medicine, Lanzhou University, Lanzhou, 730000, China
| | - Yao He
- The First School of Clinical Medicine, Lanzhou University, Lanzhou, 730000, China
| | - Hongmei Yue
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Lanzhou University, Lanzhou, 730000, China.
| | - Qingqing Yin
- Department of Geriatric Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, 250021, China.
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20
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Comolli J, Walsh DI, Bobrow J, Lennartz CL, Guido NJ, Thorsen T. An in vitro platform for study of the human gut microbiome under an oxygen gradient. Biomed Microdevices 2023; 25:14. [PMID: 37014472 PMCID: PMC10073063 DOI: 10.1007/s10544-023-00653-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/05/2023] [Indexed: 04/05/2023]
Abstract
The complex, dynamic environment of the human lower gastrointestinal tract is colonized by hundreds of bacterial species that impact health and performance. Ex vivo study of the functional interactions between microbial community members in conditions representative of those in the gut is an ongoing challenge. We have developed an in vitro 40-plex platform that provides an oxygen gradient to support simultaneous maintenance of microaerobic and anaerobic microbes from the gut microbiome that can aid in rapid characterization of microbial interactions and direct comparison of individual microbiome samples. In this report, we demonstrate that the platform more closely maintained the microbial diversity and composition of human donor fecal microbiome samples than strict anaerobic conditions. The oxygen gradient established in the platform allowed the stratification and subsequent sampling of diverse microbial subpopulations that colonize microaerobic and anaerobic micro-environments. With the ability to run forty samples in parallel, the platform has the potential to be used as a rapid screening tool to understand how the gut microbiome responds to environmental perturbations such as toxic compound exposure, dietary changes, or pharmaceutical treatments.
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Affiliation(s)
- James Comolli
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA
| | - David I Walsh
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA
| | - Johanna Bobrow
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA
| | - Chelsea L Lennartz
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA
| | - Nicholas J Guido
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA
| | - Todd Thorsen
- Biological & Chemical Technologies Group, MIT Lincoln Laboratory, Lexington, MA, USA.
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21
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Coman MM, Micioni Di Bonaventura MV, Cifani C, Silvi S, Verdenelli MC. SYNBIO® Probiotic and Antioxidant Dietary Supplementation: Clinical Trial Evaluation of Potential Effects on Airline Flight Crew Members’ Well-Being. Microorganisms 2023; 11:microorganisms11040924. [PMID: 37110347 PMCID: PMC10145893 DOI: 10.3390/microorganisms11040924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/22/2023] [Accepted: 03/30/2023] [Indexed: 04/05/2023] Open
Abstract
The irregular lifestyle of airline crew members, wide/adverse job-related exposures, and the impact of temporary hypoxia on gut microbiota well-being have increased concern about the daily recommended dose of certain nutrients among flight crew. The aim of this study was to determine if daily consumption of a SYNBIO® probiotics–elderberry extract supplement (ACTIVE) may contribute to the well-being of flight attendants. Forty healthy crew members enrolled in a double-blind, randomized, placebo-controlled study consumed one ACTIVE capsule/day or placebo for 30 days. Bowel well-being, health-related quality of life, and gastrointestinal tolerance were assessed by validated questionnaires. Saliva and fecal samples were analyzed to determine secretory immunoglobulin-A (sIgA) levels and to characterize gut microbiota composition, respectively. ACTIVE subjects presented a physiological improvement and a statistically significant higher Psychological General Well-Being Index (PGWBI) global score compared to PLACEBO subjects. The ACTIVE subjects showed significantly increased levels of lactobacilli and bifidobacteria compared to the PLACEBO group, while a significant increase in lactobacilli and a significant reduction in Enterobacteriaceae were registered when compared with the beginning of supplementation, confirming the persistence of probiotics in the gastrointestinal tract and the direct antagonism and competitive exclusion effects. Additionally, sIgA levels were significantly higher in the ACTIVE group compared to the baseline and to the PLACEBO group at the end of supplementation. The ACTIVE supplementation might be beneficial to airline crew members, improving their physiological state, their immune defenses, and the strength and efficiency of their gastrointestinal tract when responding to stressful conditions.
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Affiliation(s)
- Maria Magdalena Coman
- Synbiotec S.r.l., Spin-Off of UNICAM, Via Gentile III Da Varano, 62032 Camerino, Italy
| | | | - Carlo Cifani
- School of Pharmacy, Pharmacology Unit, University of Camerino, 62032 Camerino, Italy
| | - Stefania Silvi
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy
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22
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Lee MD, Pedroso AA, Lumpkins B, Cho Y, Maurer JJ. Pioneer colonizers: Bacteria that alter the chicken intestinal morphology and development of the microbiota. Front Physiol 2023; 14:1139321. [PMID: 37064908 PMCID: PMC10090334 DOI: 10.3389/fphys.2023.1139321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 03/14/2023] [Indexed: 03/31/2023] Open
Abstract
Microbes commonly administered to chickens facilitate development of a beneficial microbiome that improves gut function, feed conversion and reduces pathogen colonization. Competitive exclusion products, derived from the cecal contents of hens and shown to reduce Salmonella colonization in chicks, possess important pioneer-colonizing bacteria needed for proper intestinal development and animal growth. We hypothesized that inoculation of these pioneer-colonizing bacteria to day of hatch chicks would enhance the development of their intestinal anatomy and microbiome. A competitive exclusion product was administered to broiler chickens, in their drinking water, at day of hatch, and its impact on intestinal morphometrics, intestinal microbiome, and production parameters, was assessed relative to a control, no treatment group. 16S rRNA gene, terminal restriction fragment length polymorphism (T-RFLP) was used to assess ileal community composition. The competitive exclusion product, administered on day of hatch, increased villus height, villus height/width ratio and goblet cell production ∼1.25-fold and expression of enterocyte sugar transporters 1.25 to 1.5-fold in chickens at 3 days of age, compared to the control group. As a next step, chicks were inoculated with a defined formulation, containing Bacteroidia and Clostridia representing pioneer-colonizing bacteria of the two major bacterial phyla present in the competitive exclusion product. The defined formulation, containing both groups of bacteria, were shown, dependent on age, to improve villus height (jejunum: 1.14 to 1.46-fold; ileum: 1.17-fold), goblet cell numbers (ileum 1.32 to 2.51-fold), and feed efficiency (1.18-fold, day 1) while decreasing Lactobacillus ileal abundance by one-third to half in birds at 16 and 42 days of age, respectively; compared to the phosphate buffered saline treatment group. Therefore, specific probiotic formulations containing pioneer colonizing species can provide benefits in intestinal development, feed efficiency and body weight gain.
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Affiliation(s)
- Margie D. Lee
- Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, United States
- Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
- *Correspondence: Margie D. Lee,
| | - Adriana A. Pedroso
- Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Brett Lumpkins
- Department of Poultry Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, United States
| | - Youngjae Cho
- Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - John J. Maurer
- Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
- Department of Animal and Poultry Sciences, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, VA, United States
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23
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Korać Jačić J, Bajuk-Bogdanović D, Savić S, Božić Cvijan B, Spasojević I, Milenković MR. Coordination of hydralazine with Cu 2+ at acidic pH promotes its oxidative degradation at neutral pH. J Inorg Biochem 2023; 243:112181. [PMID: 36931150 DOI: 10.1016/j.jinorgbio.2023.112181] [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: 01/13/2023] [Revised: 02/22/2023] [Accepted: 03/06/2023] [Indexed: 03/12/2023]
Abstract
Hydralazine (HL), a frequently prescribed oral antihypertensive drug, shows redox interactions with transition metals such as copper that are not fully understood. Copper may be present at high concentrations in the digestive tract and can affect oral drugs. An important parameter for such interactions is pH, which changes from acidic in the gastric juice to neutral pH in intestines. In this study, we examined interactions of HL with Cu2+ ions in conditions that mimic pH shift in the digestive tract using UV-Vis, Raman and EPR spectroscopy, cyclic voltammetry and oximetry. In the acidic solution, Cu2+ formed a stable mononuclear complex with two bidentate coordinated HL molecules. On the other hand, at neutral pH, Cu2+ initiated oxidation and degradation of HL. The degradation was more rapid in the HL-Cu2+ system that was initially prepared at acidic pH and then shifted to neutral pH. The formation of the complex at acidic pH increases the availability of Cu2+ for redox reactions after the shift to neutral pH at which Cu2+ is poorly soluble. These results imply that the change of pH along the digestive tract may promote HL degradation by allowing the formation of the complex at gastric pH which makes Cu2+ available for subsequent oxidation of HL at neutral pH.
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Affiliation(s)
- Jelena Korać Jačić
- Life Sciences Department, University of Belgrade - Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Danica Bajuk-Bogdanović
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
| | - Slađana Savić
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
| | - Bojana Božić Cvijan
- Department of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, P.O. Box 38, 11000 Belgrade, Serbia
| | - Ivan Spasojević
- Life Sciences Department, University of Belgrade - Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Milica R Milenković
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia.
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24
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In vitro bioaccessibility of polyphenolic compounds: The effect of dissolved oxygen and bile. Food Chem 2023; 404:134490. [DOI: 10.1016/j.foodchem.2022.134490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 09/22/2022] [Accepted: 09/29/2022] [Indexed: 11/05/2022]
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25
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Xiang X, Wang X, Shang Y, Ding Y. Microfluidic intestine-on-a-chip: Current progress and further perspectives of probiotic-foodborne pathogen interactions. Trends Food Sci Technol 2023. [DOI: 10.1016/j.tifs.2023.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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26
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Jung EH, Brauner CJ, Wood CM. Do extreme postprandial levels of oxygen, carbon dioxide, and ammonia in the digestive tract equilibrate with the bloodstream in the freshwater rainbow trout (Oncorhynchus mykiss)? J Comp Physiol B 2023; 193:193-205. [PMID: 36656334 DOI: 10.1007/s00360-023-01475-8] [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: 02/18/2022] [Revised: 12/20/2022] [Accepted: 01/06/2023] [Indexed: 01/20/2023]
Abstract
The gastrointestinal tract (GIT) lumen of teleosts harbors extreme conditions, especially after feeding: high PCO2 (20-115 Torr), total ammonia (415-3710 μM), PNH3 (79-1760 μTorr in the intestine), and virtual anoxia (PO2 < 1 Torr). These levels could be dangerous if they were to equilibrate with the bloodstream. Thus, we investigated the potential equilibration of O2, CO2, and ammonia across the GIT epithelia in freshwater rainbow trout by monitoring postprandial arterial and venous blood gases in vivo and in situ. In vivo blood was sampled from the indwelling catheters in the dorsal aorta (DA) and subintestinal vein (SIV) draining the posterior intestine in the fasting state and at 4 to 48 h following catheter-feeding. To investigate possible ammonia absorption in the anterior part of the GIT, blood was sampled from the DA, SIV and hepatic portal vein (HPV) from anaesthetized fish in situ following voluntary feeding. We found minimal equilibration of all three gases between the GIT lumen and the SIV blood, with the latter maintaining pre-feeding levels (PO2 = 25-49 Torr, PCO2 = 6-8 Torr, and total ammonia = 117-134 μM and PNH3 = 13-30 μTorr at 48 h post-feeding). In contrast to the SIV, we found that the HPV total ammonia more than doubled 24 h after feeding (128 to 297 μM), indicative of absorption in the anterior GIT. Overall, the GIT epithelia of trout, although specialized for absorption, prevent dangerous levels of PO2, PCO2 and ammonia from equilibrating with the blood circulation.
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Affiliation(s)
- Ellen H Jung
- Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
| | - Colin J Brauner
- Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Chris M Wood
- Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
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27
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Seike K, Kiledal A, Fujiwara H, Henig I, Burgos da Silva M, van den Brink MRM, Hein R, Hoostal M, Liu C, Oravecz-Wilson K, Lauder E, Li L, Sun Y, Schmidt TM, Shah YM, Jenq RR, Dick G, Reddy P. Ambient oxygen levels regulate intestinal dysbiosis and GVHD severity after allogeneic stem cell transplantation. Immunity 2023; 56:353-368.e6. [PMID: 36736321 PMCID: PMC11098523 DOI: 10.1016/j.immuni.2023.01.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 11/12/2022] [Accepted: 01/10/2023] [Indexed: 02/05/2023]
Abstract
The severity of T cell-mediated gastrointestinal (GI) diseases such as graft-versus-host disease (GVHD) and inflammatory bowel diseases correlates with a decrease in the diversity of the host gut microbiome composition characterized by loss of obligate anaerobic commensals. The mechanisms underpinning these changes in the microbial structure remain unknown. Here, we show in multiple specific pathogen-free (SPF), gnotobiotic, and germ-free murine models of GI GVHD that the initiation of the intestinal damage by the pathogenic T cells altered ambient oxygen levels in the GI tract and caused dysbiosis. The change in oxygen levels contributed to the severity of intestinal pathology in a host intestinal HIF-1α- and a microbiome-dependent manner. Regulation of intestinal ambient oxygen levels with oral iron chelation mitigated dysbiosis and reduced the severity of the GI GVHD. Thus, targeting ambient intestinal oxygen levels may represent a novel, non-immunosuppressive strategy to mitigate T cell-driven intestinal diseases.
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Affiliation(s)
- Keisuke Seike
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA
| | - Anders Kiledal
- Department of Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Hideaki Fujiwara
- Department of Hematology and Oncology, Okayama University Hospital, 2-5-1, Shikata-cho, Kita-ku, Okayama 700-8558, Japan
| | - Israel Henig
- Department of Hematology, Rambam Health Care Campus, Haifa, Israel
| | - Marina Burgos da Silva
- Department of Immunology, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Marcel R M van den Brink
- Department of Immunology, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Robert Hein
- Department of Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Matthew Hoostal
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan Health System, Ann Arbor, MI, USA
| | - Chen Liu
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Katherine Oravecz-Wilson
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA
| | - Emma Lauder
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA
| | - Lu Li
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA
| | - Yaping Sun
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA
| | - Thomas M Schmidt
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan Health System, Ann Arbor, MI, USA
| | - Yatrik M Shah
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan Health System, Ann Arbor, MI, USA; Department of Molecular and Integrative Physiology, University of Michigan School of Medicine, Ann Arbor, MI, USA
| | - Robert R Jenq
- Department of Genomic Medicine, Division of Cancer Medicine, MD Anderson Cancer Center, Houston, TX, USA
| | - Gregory Dick
- Department of Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Pavan Reddy
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Rogel Cancer Center, Ann Arbor, MI, USA; Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA.
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28
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Liu J, Lu R, Zheng X, Hou W, Wu X, Zhao H, Wang G, Tian T. Establishment of a gut-on-a-chip device with controllable oxygen gradients to study the contribution of Bifidobacterium bifidum to inflammatory bowel disease. Biomater Sci 2023; 11:2504-2517. [PMID: 36779280 DOI: 10.1039/d2bm01490d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Supplemental Bifidobacterium has been shown to aid in the prevention, alleviation, and treatment of inflammatory bowel disease (IBD), but the progression and mechanisms are largely unstudied, partly because of a lack of appropriate models. In vitro human gut models must accurately recreate oxygen concentration gradients consistent with those in vivo to mimic gene expression, metabolism, and host-microbiome interactions. A non-equipment-intensive and inexpensive method for constructing the gut-on-a-chip with physiological oxygen concentration gradients remains challenging. Here, we propose a simple strategy using numerical simulations in a dual-channel gut-on-a-chip to guide chip design and achieve controllable oxygen gradients. By varying the size of microchannels, blocking the oxygen penetration of the polydimethylsiloxane layer at a given location, and controlling the flow of hypoxic/aerobic media, this strategy creates steep gradients across the intestinal epithelium. IBD symptoms were induced on the chip by tumor necrosis factor-α and lipopolysaccharide treatment. Bifidobacterium bifidum has been validated to contribute to the stability of the intestinal epithelial barrier, including preventing epithelial barrier disruption and promoting the repair of damaged intestinal epithelial cell monolayers. These effects may be associated with the co-localization of Bifidobacterium bifidum and ZO-1. This simple but robust approach for designing microfluidic devices is applicable to various organs-on-chips in which fluid dynamics and concentration profiles between different media must be considered. With the customized chip, the integration of activated Bifidobacterium bifidum provides an initial step toward developing a multi-factorial IBD platform. The approach could be scaled up for disease modeling, high-throughput drug screening and personalized medicine.
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Affiliation(s)
- Jun Liu
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Ronghao Lu
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Xiaolin Zheng
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Wensheng Hou
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Xiaoying Wu
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Hezhao Zhao
- Department of Gastrointestinal Surgery, Chongqing University Cancer Hospital, Chongqing University, Chongqing, 400030, China
| | - Guixue Wang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
| | - Tian Tian
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, China.
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29
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Rivera KR, Bliton RJ, Burclaff J, Czerwinski MJ, Liu J, Trueblood JM, Hinesley CM, Breau KA, Joshi S, Pozdin VA, Yao M, Ziegler AL, Blikslager AT, Daniele MA, Magness ST. A new microphysiological system shows hypoxia primes human ISCs for interleukin-dependent rescue of stem cell activity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.31.524747. [PMID: 36778265 PMCID: PMC9915581 DOI: 10.1101/2023.01.31.524747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Background & Aims Hypoxia in the intestinal epithelium can be caused by acute ischemic events or conditions like Inflammatory Bowel Disease (IBD) where immune cell infiltration produces 'inflammatory hypoxia', a chronic condition that starves the mucosa of oxygen. Epithelial regeneration after ischemia and IBD suggests intestinal stem cells (ISCs) are highly tolerant to acute and chronic hypoxia; however, the impact of acute and chronic hypoxia on human ISC (hISC) properties have not been reported. Here we present a new microphysiological system (MPS) to investigate how hypoxia affects hISCs isolated from healthy human tissues. We then test the hypothesis that some inflammation-associated interleukins protect hISCs during prolonged hypoxia. Methods hISCs were exposed to <1.0% oxygen in the MPS for 6-, 24-, 48- & 72hrs. Viability, HIF1α response, transcriptomics, cell cycle dynamics, and hISC response to cytokines were evaluated. Results The novel MPS enables precise, real-time control and monitoring of oxygen levels at the cell surface. Under hypoxia, hISCs remain viable until 72hrs and exhibit peak HIF1α at 24hrs. hISCs lose stem cell activity at 24hrs that recovers at 48hrs of hypoxia. Hypoxia increases the proportion of hISCs in G1 and regulates hISC capacity to respond to multiple inflammatory signals. Hypoxia induces hISCs to upregulate many interleukin receptors and hISCs demonstrate hypoxia-dependent cell cycle regulation and increased organoid forming efficiency when treated with specific interleukins. Conclusions Hypoxia primes hISCs to respond differently to interleukins than hISCs in normoxia through a transcriptional response. hISCs slow cell cycle progression and increase hISC activity when treated with hypoxia and specific interleukins. These findings have important implications for epithelial regeneration in the gut during inflammatory events.
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Affiliation(s)
- Kristina R. Rivera
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill 911 Oval Dr., Raleigh, NC, 27695 (USA)
| | - R. Jarrett Bliton
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill 911 Oval Dr., Raleigh, NC, 27695 (USA)
| | - Joseph Burclaff
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill 911 Oval Dr., Raleigh, NC, 27695 (USA)
| | - Michael J. Czerwinski
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
| | - Jintong Liu
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
| | - Jessica M. Trueblood
- Center for Gastrointestinal Biology and Disease, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Caroline M. Hinesley
- Center for Gastrointestinal Biology and Disease, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Keith A Breau
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
| | - Shlok Joshi
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
| | - Vladimir A. Pozdin
- Department of Electrical & Computer Engineering, North Carolina State University, Raleigh, NC, 27695 (USA)
| | - Ming Yao
- Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695 (USA)
| | - Amanda L. Ziegler
- Center for Gastrointestinal Biology and Disease, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Anthony T. Blikslager
- Center for Gastrointestinal Biology and Disease, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Michael A. Daniele
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill 911 Oval Dr., Raleigh, NC, 27695 (USA)
- Department of Electrical & Computer Engineering, North Carolina State University, Raleigh, NC, 27695 (USA)
| | - Scott T. Magness
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill 911 Oval Dr., Raleigh, NC, 27695 (USA)
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
- School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599 (USA)
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Butler NL, Ito T, Foreman S, Morgan JE, Zagorevsky D, Malamy MH, Comstock LE, Barquera B. Bacteroides fragilis Maintains Concurrent Capability for Anaerobic and Nanaerobic Respiration. J Bacteriol 2023; 205:e0038922. [PMID: 36475831 PMCID: PMC9879120 DOI: 10.1128/jb.00389-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 11/02/2022] [Indexed: 12/13/2022] Open
Abstract
Bacteroides species can use fumarate and oxygen as terminal electron acceptors during cellular respiration. In the human gut, oxygen diffuses from intestinal epithelial cells supplying "nanaerobic" oxygen levels. Many components of the anaerobic respiratory pathway have been determined, but such analyses have not been performed for nanaerobic respiration. Here, we present genetic, biochemical, enzymatic, and mass spectrometry analyses to elucidate the nanaerobic respiratory pathway in Bacteroides fragilis. Under anaerobic conditions, the transfer of electrons from NADH to the quinone pool has been shown to be contributed by two enzymes, NQR and NDH2. We find that the activity contributed by each under nanaerobic conditions is 77 and 23%, respectively, similar to the activity levels under anaerobic conditions. Using mass spectrometry, we show that the quinone pool also does not differ under these two conditions and consists of a mixture of menaquinone-8 to menaquinone-11, with menaquinone-10 predominant under both conditions. Analysis of fumarate reductase showed that it is synthesized and active under anaerobic and nanaerobic conditions. Previous RNA sequencing data and new transcription reporter assays show that expression of the cytochrome bd oxidase gene does not change under these conditions. Under nanaerobic conditions, we find both increased CydA protein and increased cytochrome bd activity. Reduced-minus-oxidized spectra of membranes showed the presence of heme d when the bacteria were grown in the presence of protoporphyrin IX and iron under both anaerobic and nanaerobic conditions, suggesting that the active oxidase can be assembled with or without oxygen. IMPORTANCE By performing a comprehensive analysis of nanaerobic respiration in Bacteroides fragilis, we show that this organism maintains capabilities for anaerobic respiration on fumarate and nanaerobic respiration on oxygen simultaneously. The contribution of the two NADH:quinone oxidoreductases and the composition of the quinone pool are the same under both conditions. Fumarate reductase and cytochrome bd are both present, and which of these terminal enzymes is active in electron transfer depends on the availability of the final electron acceptor: fumarate or oxygen. The synthesis of cytochrome bd and fumarate reductase under both conditions serves as an adaptation to an environment with low oxygen concentrations so that the bacteria can maximize energy conservation during fluctuating environmental conditions or occupation of different spatial niches.
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Affiliation(s)
- Nicole L. Butler
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Takeshi Ito
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Sara Foreman
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Joel E. Morgan
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Dmitry Zagorevsky
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Michael H. Malamy
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Laurie E. Comstock
- Duchossois Family Institute and Department of Microbiology, University of Chicago, Chicago, Illinois, USA
| | - Blanca Barquera
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York, USA
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, New York, USA
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Bourgonje AR, Kloska D, Grochot-Przęczek A, Feelisch M, Cuadrado A, van Goor H. Personalized redox medicine in inflammatory bowel diseases: an emerging role for HIF-1α and NRF2 as therapeutic targets. Redox Biol 2023; 60:102603. [PMID: 36634466 PMCID: PMC9841059 DOI: 10.1016/j.redox.2023.102603] [Citation(s) in RCA: 26] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/05/2023] [Accepted: 01/05/2023] [Indexed: 01/07/2023] Open
Abstract
Inflammatory bowel diseases (IBD), encompassing Crohn's disease (CD) and ulcerative colitis (UC), are intimately associated with inflammation and overproduction of reactive oxygen species (ROS). Temporal and inter-individual variabilities in disease activity and response to therapy pose significant challenges to diagnosis and patient care. Discovery and validation of truly integrative biomarkers would benefit from embracing redox metabolomics approaches with prioritization of central regulatory hubs. We here make a case for applying a personalized redox medicine approach that aims to selectively inhibit pathological overproduction and/or altered expression of specific enzymatic sources of ROS without compromising physiological function. To this end, improved 'clinical-omics integration' may help to better understand which particular redox signaling pathways are disrupted in what patient. Pharmacological interventions capable of activating endogenous antioxidant defense systems may represent viable therapeutic options to restore local/systemic redox status, with HIF-1α and NRF2 holding particular promise in this context. Achieving the implementation of clinically meaningful mechanism-based biomarkers requires development of easy-to-use, robust and cost-effective tools for secure diagnosis and monitoring of treatment efficacy. Ultimately, matching redox-directed pharmacological interventions to individual patient phenotypes using predictive biomarkers may offer new opportunities to break the therapeutic ceiling in IBD.
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Affiliation(s)
- Arno R. Bourgonje
- Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands,Corresponding author.
| | - Damian Kloska
- Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland
| | - Anna Grochot-Przęczek
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
| | - Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Antonio Cuadrado
- Instituto de Investigaciones Biomédicas “Alberto Sols” UAM-CSIC. Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), ISCIII, Madrid, Spain
| | - Harry van Goor
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
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Yamamoto A, Kambara Y, Fujiwara H. Impact of oral microbiota on pathophysiology of GVHD. Front Immunol 2023; 14:1132983. [PMID: 36969182 PMCID: PMC10033631 DOI: 10.3389/fimmu.2023.1132983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 02/23/2023] [Indexed: 03/29/2023] Open
Abstract
Allogeneic transplantation of hematopoietic cells is the only curative therapy for several hematopoietic disease in which patients receive cytotoxic conditioning regimens followed by infusion of hematopoietic stem cells. Although the outcomes have improved over the past decades, graft-versus-host-disease (GVHD), the most common life-threatening complication, remains a major cause of non-relapse morbidity and mortality. Pathophysiology of acute GVHD characterized by host antigen-presenting cells after tissue damage and donor T-cells is well studied, and additionally the importance of recipient microbiota in the intestine is elucidated in the GVHD setting. Oral microbiota is the second most abundant bacterial flora in the body after the intestinal tract, and it is related to chronic inflammation and carcinogenesis. Recently, composition of the oral microbiome in GVHD related to transplantation has been characterized and several common patterns, dysbiosis and enrichment of the specific bacterial groups, have been reported. This review focuses on the role of the oral microbiota in the context of GVHD.
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Affiliation(s)
- Akira Yamamoto
- Department of Hematology and Oncology, Okayama University Hospital, Okayama, Japan
| | - Yui Kambara
- Department of Hematology and Oncology and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Hideaki Fujiwara
- Department of Hematology and Oncology, Okayama University Hospital, Okayama, Japan
- *Correspondence: Hideaki Fujiwara,
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Abstract
Extracellular electron transfer (EET) is a process via which certain microorganisms, such as bacteria, exchange electrons with extracellular materials by creating an electrical link across their membranes. EET has been studied for the reactions on solid materials such as minerals and electrodes with implication in geobiology and biotechnology. EET-capable bacteria exhibit broad phylogenetic diversity, and some are found in environments with various types of electron acceptors/donors not limited to electrodes or minerals. Oxygen has also been shown to serve as the terminal electron acceptor for EET of Pseudomonas aeruginosa and Faecalibacterium prausnitzii. However, the physiological significance of such oxygen-terminating EETs, as well as the mechanisms underlying them, remain unclear. In order to understand the physiological advantage of oxygen-terminating EET and its link with energy metabolism, in this review, we compared oxygen-terminating EET with aerobic respiration, fermentation, and electrode-terminating EET. We also summarized benefits and limitations of oxygen-terminating EET in a biofilm setting, which indicate that EET capability enables bacteria to create a niche in the anoxic zone of aerobic biofilms, thereby remodeling bacterial metabolic activities in biofilms.
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Biagini F, Daddi C, Calvigioni M, De Maria C, Zhang YS, Ghelardi E, Vozzi G. Designs and methodologies to recreate in vitro human gut microbiota models. Biodes Manuf 2022. [DOI: 10.1007/s42242-022-00210-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
AbstractThe human gut microbiota is widely considered to be a metabolic organ hidden within our bodies, playing a crucial role in the host’s physiology. Several factors affect its composition, so a wide variety of microbes residing in the gut are present in the world population. Individual excessive imbalances in microbial composition are often associated with human disorders and pathologies, and new investigative strategies to gain insight into these pathologies and define pharmaceutical therapies for their treatment are needed. In vitro models of the human gut microbiota are commonly used to study microbial fermentation patterns, community composition, and host-microbe interactions. Bioreactors and microfluidic devices have been designed to culture microorganisms from the human gut microbiota in a dynamic environment in the presence or absence of eukaryotic cells to interact with. In this review, we will describe the overall elements required to create a functioning, reproducible, and accurate in vitro culture of the human gut microbiota. In addition, we will analyze some of the devices currently used to study fermentation processes and relationships between the human gut microbiota and host eukaryotic cells.
Graphic abstract
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Mazzantini D, Calvigioni M, Celandroni F, Lupetti A, Ghelardi E. In vitro assessment of probiotic attributes for strains contained in commercial formulations. Sci Rep 2022; 12:21640. [PMID: 36517529 PMCID: PMC9751119 DOI: 10.1038/s41598-022-25688-z] [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: 08/06/2021] [Accepted: 12/02/2022] [Indexed: 12/15/2022] Open
Abstract
Although probiotics are often indiscriminately prescribed, they are not equal and their effects on the host may profoundly differ. In vitro determination of the attributes of probiotics should be a primary concern and be performed even before clinical studies are designed. In fact, knowledge on the biological properties a microbe possesses is crucial for selecting the most suitable bacteriotherapy for each individual. Herein, nine strains (Bacillus clausii NR, OC, SIN, T, Bacillus coagulans ATCC 7050, Bifidobacterium breve DSM 16604, Limosilactobacillus reuteri DSM 17938, Lacticaseibacillus rhamnosus ATCC 53103, and Saccharomyces boulardii CNCM I-745) declared to be contained in six commercial formulations were tested for their ability to tolerate simulated intestinal conditions, adhere to mucins, and produce β-galactosidase, antioxidant enzymes, riboflavin, and D-lactate. With the exception of B. breve, all microbes survived in simulated intestinal fluid. L. rhamnosus was unable to adhere to mucins and differences in mucin adhesion were evidenced for L. reuteri and S. boulardii depending on oxygen levels. All microorganisms produced antioxidant enzymes, but only B. clausii, B. coagulans, B. breve, and L. reuteri synthesize β-galactosidase. Riboflavin secretion was observed for Bacillus species and L. rhamnosus, while D-lactate production was restricted to L. reuteri and L. rhamnosus. Our findings indicate that the analyzed strains possess different in vitro biological properties, thus highlighting the usefulness of in vitro tests as prelude for clinical research.
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Affiliation(s)
- Diletta Mazzantini
- grid.5395.a0000 0004 1757 3729Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Marco Calvigioni
- grid.5395.a0000 0004 1757 3729Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Francesco Celandroni
- grid.5395.a0000 0004 1757 3729Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Antonella Lupetti
- grid.5395.a0000 0004 1757 3729Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Emilia Ghelardi
- grid.5395.a0000 0004 1757 3729Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy ,grid.5395.a0000 0004 1757 3729Research Center Nutraceuticals and Food for Health-Nutrafood, University of Pisa, Pisa, Italy
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36
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Du W, Liu L, Ma Y, Zhu Q, Jia R, Han Y, Wu Z, Yan X, Ailizire A, Zhang W. Analysis of the gut microbiome in obese native Tibetan children living at different altitudes: A case-control study. Front Public Health 2022; 10:963202. [PMID: 36504960 PMCID: PMC9731119 DOI: 10.3389/fpubh.2022.963202] [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: 06/07/2022] [Accepted: 11/10/2022] [Indexed: 11/27/2022] Open
Abstract
Objective To explore the relationship between intestinal flora and obesity in Tibetan children at different altitudes. Methods Using16S rRNA gene sequencing results and blood lipid metabolism indexes to study the characteristics of the intestinal flora present in faeces and changes in blood lipid metabolism in obese children in Tibet who reside at different altitudes and to study correlations between blood lipid metabolism indicators and the intestinal flora composition. Results The results showed the following. (a) The triglyceride (TG) and low-density lipoprotein cholesterol (LDL-C) levels in the obesity groups were higher than those in the normal-weight groups, and those in the high-altitude obesity groups were lower than those in the low-altitude obesity groups. (b) The 16S rRNA gene sequencing results showed that altitude affected the composition and relative abundance of the gut microbiota. These parameters were basically the same among the low-altitude groups, while they were significantly lower in the high-altitude groups than in the low-altitude groups. (c) Groups that lived at different altitudes and had different body weights had different dominant bacterial genera. Megamonas was closely related to obesity, and its relative abundance in the low-altitude groups was higher than that in the high-altitude groups. Prevotella was associated with altitude, and its relative abundance in the high-altitude groups was higher than that in the low-altitude groups. In addition, Prevotella elicited changes in the abundance of Escherichia-Shigella. The lower prevalence of obesity and incidence of intestinal inflammation in those living at high altitudes were related to the abundance of Prevotella. (d) There were correlations between the gut microbiota composition and lipid metabolism indicators. The abundance of Romboutsia was positively correlated with TG and LDL-C levels but negatively correlated with high-density lipoprotein cholesterol (HDL-C) levels. The abundance of Akkermansia was negatively correlated with LDL-C levels, and the abundance of Blautia was negatively correlated with body mass index (BMI) and LDL-C levels. Conclusions The intestinal flora diversity varied by body weight and altitude, with lower diversity in those at higher altitudes and with lower body weights. Prevotella likely plays a role in suppressing obesity at high altitudes.
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Affiliation(s)
- Wenqi Du
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Department of Public Health, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China
| | - Linxun Liu
- General Surgery Department, Qinghai Provincial People's Hospital, Xining, China
| | - Yan Ma
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China,Qinghai-Utah Joint Research Key Lab for High Altitude Medicine, Qinghai University School of Medicine, Xining, China
| | - Qinfang Zhu
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China
| | - Ruhan Jia
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China
| | - Ying Han
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China
| | - Ziyi Wu
- Department of Public Health, Qinghai University School of Medicine, Xining, China
| | - Xin Yan
- Department of Public Health, Qinghai University School of Medicine, Xining, China
| | - Ainiwaer Ailizire
- Department of Public Health, Qinghai University School of Medicine, Xining, China
| | - Wei Zhang
- Research Center for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,Department of Public Health, Qinghai University School of Medicine, Xining, China,Key Laboratory for Application of High Altitude Medicine in Qinghai Province, Qinghai University, Xining, China,Qinghai-Utah Joint Research Key Lab for High Altitude Medicine, Qinghai University School of Medicine, Xining, China,*Correspondence: Wei Zhang
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Mo R, Ma W, Zhou W, Gao B. Polar localization of CheO under hypoxia promotes Campylobacter jejuni chemotactic behavior within host. PLoS Pathog 2022; 18:e1010953. [PMID: 36327346 PMCID: PMC9665402 DOI: 10.1371/journal.ppat.1010953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 11/15/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022] Open
Abstract
Campylobacter jejuni is a food-borne zoonotic pathogen of worldwide concern and the leading cause of bacterial diarrheal disease. In contrast to other enteric pathogens, C. jejuni has strict growth and nutritional requirements but lacks many virulence factors that have evolved for pathogenesis or interactions with the host. It is unclear how this bacterium has adapted to an enteric lifestyle. Here, we discovered that the CheO protein (CJJ81176_1265) is required for C. jejuni colonization of mice gut through its role in chemotactic control of flagellar rotation in oxygen-limiting environments. CheO interacts with the chemotaxis signaling proteins CheA and CheZ, and also with the flagellar rotor components FliM and FliY. Under microaerobic conditions, CheO localizes at the cellular poles where the chemosensory array and flagellar machinery are located in C. jejuni and its polar localization depends on chemosensory array formation. Several chemoreceptors that mediate energy taxis coordinately determine the bipolar distribution of CheO. Suppressor screening for a ΔcheO mutant identified that a single residue variation in FliM can alleviate the phenotype caused by the absence of CheO, confirming its regulatory role in the flagellar rotor switch. CheO homologs are only found in species of the Campylobacterota phylum, mostly species of host-associated genera Campylobacter, Helicobacter and Wolinella. The CheO results provide insights into the complexity of chemotaxis signal transduction in C. jejuni and closely related species. Importantly, the recruitment of CheO into chemosensory array to promote chemotactic behavior under hypoxia represents a new adaptation strategy of C. jejuni to human and animal intestines. Bacteria use chemotaxis to navigate their flagellar motility towards or away from a variety of environmental stimuli. For many pathogens, chemotactic motility plays an important role in infection and disease. Understanding the mechanism of chemotaxis behavior in pathogens can help the development of therapeutic strategies by interfering with chemotactic signal transduction. In this study, we identified a novel chemotaxis protein CheO in Campylobacter jejuni, a leading cause of human gastroenteritis worldwide. We demonstrated that CheO is directly involved in chemotactic control of the flagellar motor switch, the reason that it is required for colonization of different animal models. We also provide evidences that CheO is responsive to environmental oxygen variation, with a more prominent role in energy taxis under low oxygen levels. Therefore, CheO presents a novel mechanism for C. jejuni adaptation to hypoxia conditions such as those existing in human and animal intestines. Targeting CheO and other chemotaxis regulators could reduce the survival of C. jejuni within hosts and in the food chain.
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Affiliation(s)
- Ran Mo
- CAS Key Laboratory of Tropical Marine Bio Resources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, Innovation Academy of South China Sea Ecology and Environmental Engineering, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
- Tropical Marine Biological Research Station in Hainan, Sanya Institute of Oceanology, Chinese Academy of Sciences and Hainan Key Laboratory of Tropical Marine Biotechnology, Sanya, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Wenhui Ma
- Department of General Surgery & Guangdong Provincial Key Laboratory of Precision Medicine for Gastrointestinal Tumor, Nanfang Hospital, First Clinical Medical School, Southern Medical University, Guangzhou, China
| | - Weijie Zhou
- Department of General Surgery & Guangdong Provincial Key Laboratory of Precision Medicine for Gastrointestinal Tumor, Nanfang Hospital, First Clinical Medical School, Southern Medical University, Guangzhou, China
| | - Beile Gao
- CAS Key Laboratory of Tropical Marine Bio Resources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, Innovation Academy of South China Sea Ecology and Environmental Engineering, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
- Tropical Marine Biological Research Station in Hainan, Sanya Institute of Oceanology, Chinese Academy of Sciences and Hainan Key Laboratory of Tropical Marine Biotechnology, Sanya, China
- * E-mail:
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Fan L, Zhu X, Sun S, Yu C, Huang X, Ness R, Dugan LL, Shu L, Seidner DL, Murff HJ, Fodor AA, Azcarate-Peril MA, Shrubsole MJ, Dai Q. Ca:Mg ratio, medium-chain fatty acids, and the gut microbiome. Clin Nutr 2022; 41:2490-2499. [PMID: 36223712 PMCID: PMC9588659 DOI: 10.1016/j.clnu.2022.08.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/04/2022] [Accepted: 08/31/2022] [Indexed: 12/26/2022]
Abstract
BACKGROUND & AIMS Ketogenic medium-chain fatty acids (MCFAs) with profound health benefits are commonly found in dairy products, palm kernel oil and coconut oil. We hypothesize that magnesium (Mg) supplementation leads to enhanced gut microbial production of MCFAs and, in turn, increased circulating MCFAs levels. METHODS We tested this hypothesis in the Personalized Prevention of Colorectal Cancer Trial (PPCCT) (NCT01105169), a double-blind 2 × 2 factorial randomized controlled trial enrolling 240 participants. Six 24-h dietary recalls were performed for all participants at the baseline and during the intervention period. Based on the baseline 24-h dietary recalls, the Mg treatment used a personalized dose of Mg supplementation that would reduce the calcium (Ca): Mg intake ratio to around 2.3. We measured plasma MCFAs, sugars, ketone bodies and tricarboxylic acid cycle (TCA cycle) metabolites using the Metabolon's global Precision Metabolomics™ LC-MS platform. Whole-genome shotgun metagenomics (WGS) sequencing was performed to assess microbiota in stool samples, rectal swabs, and rectal biopsies. RESULTS Personalized Mg treatment (mean dose 205.58 mg/day with a range from 77.25 to 389.55 mg/day) significantly increased the plasma levels of C7:0, C8:0, and combined C7:0 and C8:0 by 18.45%, 25.28%, and 24.20%, respectively, compared to 14.15%, 10.12%, and 12.62% decreases in the placebo arm. The effects remain significant after adjusting for age, sex, race and baseline level (P = 0.0126, P = 0.0162, and P = 0.0031, respectively) and FDR correction at 0.05 (q = 0.0324 for both C7:0 and C8:0). Mg treatment significantly reduced the plasma level of sucrose compared to the placebo arm (P = 0.0036 for multivariable-adjusted and P = 0.0216 for additional FDR correction model) whereas alterations in daily intakes of sucrose, fructose, glucose, maltose and C8:0 from baseline to the end of trial did not differ between two arms. Mediation analysis showed that combined C7:0 and C8:0 partially mediated the effects of Mg treatment on total and individual ketone bodies (P for indirect effect = 0.0045, 0.0043, and 0.03, respectively). The changes in plasma levels of C7:0 and C8:0 were significantly and positively correlated with the alterations in stool microbiome α diversity (r = 0.51, p = 0.0023 and r = 0.34, p = 0.0497, respectively) as well as in stool abundance for the signatures of MCFAs-related microbiota with acyl-ACP thioesterase gene producing C7:0 (r = 0.46, p = 0.0067) and C8:0 (r = 0.49, p = 0.003), respectively, following Mg treatment. CONCLUSIONS Optimizing Ca:Mg intake ratios to around 2.3 through 12-week personalized Mg supplementation leads to increased circulating levels of MCFAs (i.e. C7:0 and C8:0), which is attributed to enhanced production from gut microbial fermentation and, maybe, sucrose consumption.
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Affiliation(s)
- Lei Fan
- Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Xiangzhu Zhu
- Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Shan Sun
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC, USA
| | - Chang Yu
- Department of Biostatistics, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Xiang Huang
- Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Reid Ness
- Department of Medicine, Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Laura L Dugan
- Veterans Health Administration-Tennessee Valley Healthcare System Geriatric Research Education Clinical Center (GRECC), HSR&D Center, Vanderbilt University Medical Center, Nashville, TN, USA; Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA; Division of Geriatric Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Lihua Shu
- Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Douglas L Seidner
- Center for Human Nutrition, Department of Gastroenterology, Hepatology and Nutrition, Digestive Disease and Surgical Institute, Cleveland Clinic, OH, USA
| | - Harvey J Murff
- Veterans Health Administration-Tennessee Valley Healthcare System Geriatric Research Education Clinical Center (GRECC), HSR&D Center, Vanderbilt University Medical Center, Nashville, TN, USA; Division of Geriatric Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Anthony A Fodor
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC, USA
| | - M Andrea Azcarate-Peril
- Department of Medicine, Division of Gastroenterology and Hepatology, and UNC Microbiome Core, Center for Gastrointestinal Biology and Disease, School of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Martha J Shrubsole
- Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Qi Dai
- Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA.
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Insights into the complexation and oxidation of quercetin and luteolin in aqueous solutions in presence of selected metal cations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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40
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Yan Z, Zhang S, Zhao Y, Yu W, Zhao Y, Zhang Y. Phthalates released from microplastics inhibit microbial metabolic activity and induce different effects on intestinal luminal and mucosal microbiota. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 310:119884. [PMID: 35931388 DOI: 10.1016/j.envpol.2022.119884] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/12/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
The intestine is not only the main accumulation organ of microplastics (MPs), but also the intestinal environment is very conductive to the release of additives in MPs. However, the kinetics of release process, influence factors, and the related effects on gut microbiota remain largely unknown. In this study, a mucosal-simulator of the human intestinal microbial ecosystem (M-SHIME) was used to investigate the influence of gut microbiota on the release of phthalates (PAEs) from MPs and the effects of MPs on the intestinal luminal microbiota and mucosal microbiota. We found that di-(2-ethylhexyl) phthalate (DEHP), di-n-butyl phthalate (DBP), and dimethyl phthalate (DMP) were the dominant PAEs released in the gut. Gut microbiota accelerated the release of PAEs, with the time to reach the maximum release was shortened from 7 days to 2 days. Moreover, MPs induced differential effects on luminal microbiota and mucosal microbiota. Compared with mucosal microbiota, the luminal microbiota was more susceptible to the leaching of PAEs from MPs, as evidenced by more microbiota alterations. MPs also inhibited the metabolic activity of intestinal flora based on the reduced production of short chain fatty acids (SCFA). These effects were mainly contributed by the release of PAEs. Acidaminococcus and Morganella were simultaneously correlated to the release of PAEs and the inhibition of metabolic activity of intestinal microbiota and can be used as indicators for the intestinal exposure of MPs and additives.
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Affiliation(s)
- Zehua Yan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Shenghu Zhang
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, Jiangsu, 210042, China
| | - Yonggang Zhao
- Environment Monitoring Center of Jiangsu Province, Nanjing, Jiangsu, 210019, China
| | - Wenyi Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Yanping Zhao
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu, 210023, China
| | - Yan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, China.
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Loktionov A. Colon mucus in colorectal neoplasia and beyond. World J Gastroenterol 2022; 28:4475-4492. [PMID: 36157924 PMCID: PMC9476883 DOI: 10.3748/wjg.v28.i32.4475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/23/2022] [Accepted: 08/06/2022] [Indexed: 02/06/2023] Open
Abstract
Little was known about mammalian colon mucus (CM) until the beginning of the 21st century. Since that time considerable progress has been made in basic research addressing CM structure and functions. Human CM is formed by two distinct layers composed of gel-forming glycosylated mucins that are permanently secreted by goblet cells of the colonic epithelium. The inner layer is dense and impenetrable for bacteria, whereas the loose outer layer provides a habitat for abundant commensal microbiota. Mucus barrier integrity is essential for preventing bacterial contact with the mucosal epithelium and maintaining homeostasis in the gut, but it can be impaired by a variety of factors, including CM-damaging switch of commensal bacteria to mucin glycan consumption due to dietary fiber deficiency. It is proven that impairments in CM structure and function can lead to colonic barrier deterioration that opens direct bacterial access to the epithelium. Bacteria-induced damage dysregulates epithelial proliferation and causes mucosal inflammatory responses that may expand to the loosened CM and eventually result in severe disorders, including colitis and neoplastic growth. Recently described formation of bacterial biofilms within the inner CM layer was shown to be associated with both inflammation and cancer. Although obvious gaps in our knowledge of human CM remain, its importance for the pathogenesis of major colorectal diseases, comprising inflammatory bowel disease and colorectal cancer, is already recognized. Continuing progress in CM exploration is likely to result in the development of a range of new useful clinical applications addressing colorectal disease diagnosis, prevention and therapy.
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Lee JE, Kim KS, Koh H, Lee DW, Kang NJ. Diet-Induced Host-Microbe Interactions: Personalized Diet Strategies for Improving Inflammatory Bowel Disease. Curr Dev Nutr 2022; 6:nzac110. [PMID: 36060223 PMCID: PMC9429970 DOI: 10.1093/cdn/nzac110] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/25/2022] [Accepted: 06/13/2022] [Indexed: 12/02/2022] Open
Abstract
Inflammatory bowel disease (IBD) is an idiopathic inflammatory disease. Environmental sanitization, modern lifestyles, advanced medicines, ethnic origins, host genetics and immune systems, mucosal barrier function, and the gut microbiota have been delineated to explain how they cause mucosal inflammation. However, the pathogenesis of IBD and its therapeutic targets remain elusive. Recent studies have highlighted the importance of the human gut microbiota in health and disease, suggesting that the pathogenesis of IBD is highly associated with imbalances of the gut microbiota or alterations of epithelial barrier function in the gastrointestinal (GI) tract. Moreover, diet-induced alterations of the gut microbiota in the GI tract modulate immune responses and perturb metabolic homeostasis. This review summarizes recent findings on IBD and its association with diet-induced changes in the gut microbiota; furthermore, it discusses how diets can modulate host gut microbes and immune systems, potentiating the impact of personalized diets on therapeutic targets for IBD.
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Affiliation(s)
- Jae-Eun Lee
- School of Food Science and Biotechnology, Kyungpook National University, Daegu, South Korea
- Department of Biotechnology, Yonsei University, Seoul, South Korea
| | - Kyoung Su Kim
- Department of Biotechnology, Yonsei University, Seoul, South Korea
| | - Hong Koh
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, South Korea
| | - Dong-Woo Lee
- Department of Biotechnology, Yonsei University, Seoul, South Korea
| | - Nam Joo Kang
- School of Food Science and Biotechnology, Kyungpook National University, Daegu, South Korea
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43
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Modesto A, Cameron NR, Varghese C, Peters N, Stokes B, Phillips A, Bissett I, O'Grady G. Meta-Analysis of the Composition of Human Intestinal Gases. Dig Dis Sci 2022; 67:3842-3859. [PMID: 34623578 DOI: 10.1007/s10620-021-07254-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 09/13/2021] [Indexed: 12/09/2022]
Abstract
BACKGROUND Understanding intestinal gases volume and composition may contribute to diagnosing digestive diseases and the microbiome's status. This meta-analysis aimed to define the composition of human intestinal gases and changes associated with diet. METHODS Studies were identified by systematic research of the MEDLINE(Ovid), Scopus, and Cochrane databases. Studies that measured the concentration of intestinal gases in healthy adult humans were retrieved. The JBI critical appraisal tool was used to evaluate the risk of bias. The primary outcomes analysed were the concentration of the most prevalent colonic gases. Participants were divided into groups according to dietary fibre content. RESULTS Eleven studies were included. The following gases were identified in similar concentrations across all studies (mean ± standard deviation): nitrogen (65.1 ± 20.89%), oxygen (2.3 ± 0.98%), carbon dioxide (9.9 ± 1.6%), hydrogen (2.9 ± 0.7%), and methane (14.4 ± 3.7%). Differences according to the dietary fibre were observed, with a positive correlation between fibre and volume of gas produced, particularly in fermented gases (carbon dioxide, hydrogen, and methane). DISCUSSION The meta-analysis has found defined concentrations of the five most common gases present in human colonic gas. Limitations included heterogenic methodologies, a low number of participants, and few recent studies. These findings may be helpful in diagnostic applications where colonic gas volume and composition are crucial factors, including functional disorders, microbiome analyses, and bowel perforation diagnostics.
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Affiliation(s)
- Andre Modesto
- Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, 1023, New Zealand
| | - Nelle-Rose Cameron
- Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, 1023, New Zealand
| | - Chris Varghese
- Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, 1023, New Zealand
| | - Nicolas Peters
- Auckland Bioengineering Institute, The University of Auckland, Auckland, 1010, New Zealand
| | - Bruce Stokes
- Auckland Bioengineering Institute, The University of Auckland, Auckland, 1010, New Zealand
| | - Anthony Phillips
- Faculty of Science, The University of Auckland, Auckland, 1010, New Zealand
| | - Ian Bissett
- Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, 1023, New Zealand
| | - Greg O'Grady
- Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, 1023, New Zealand. .,Auckland Bioengineering Institute, The University of Auckland, Auckland, 1010, New Zealand.
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Focarelli F, Giachino A, Waldron KJ. Copper microenvironments in the human body define patterns of copper adaptation in pathogenic bacteria. PLoS Pathog 2022; 18:e1010617. [PMID: 35862345 PMCID: PMC9302775 DOI: 10.1371/journal.ppat.1010617] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Copper is an essential micronutrient for most organisms that is required as a cofactor for crucial copper-dependent enzymes encoded by both prokaryotes and eukaryotes. Evidence accumulated over several decades has shown that copper plays important roles in the function of the mammalian immune system. Copper accumulates at sites of infection, including the gastrointestinal and respiratory tracts and in blood and urine, and its antibacterial toxicity is directly leveraged by phagocytic cells to kill pathogens. Copper-deficient animals are more susceptible to infection, whereas those fed copper-rich diets are more resistant. As a result, copper resistance genes are important virulence factors for bacterial pathogens, enabling them to detoxify the copper insult while maintaining copper supply to their essential cuproenzymes. Here, we describe the accumulated evidence for the varied roles of copper in the mammalian response to infections, demonstrating that this metal has numerous direct and indirect effects on immune function. We further illustrate the multifaceted response of pathogenic bacteria to the elevated copper concentrations that they experience when invading the host, describing both conserved and species-specific adaptations to copper toxicity. Together, these observations demonstrate the roles of copper at the host–pathogen interface and illustrate why bacterial copper detoxification systems can be viable targets for the future development of novel antibiotic drug development programs. Copper is required by both animals and bacteria in small quantities as a micronutrient. During infection, the mammalian immune system increases the local concentration of copper, which gives rise to copper toxicity in the pathogen. In turn, bacterial pathogens possess specialized systems to resist this copper toxicity. Copper also plays important, indirect roles in the function of the immune system. In this review, we explain the diverse roles of copper in the human body with a focus on its functions within the immune system. We also describe how bacterial pathogens respond to the copper toxicity that they experience within the host during infection, illustrating both conserved copper homeostasis and detoxification systems in bacteria and species-specific adaptations that have been shown to be important to pathogenicity. The key role of copper at the host–pathogen interface and the essential requirement for pathogenic bacteria to resist copper toxicity makes the protein components that confer resistance on pathogens potential targets for future development of novel antibiotic drugs.
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Affiliation(s)
- Francesca Focarelli
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Andrea Giachino
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Kevin John Waldron
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail:
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Sharon I, Quijada NM, Pasolli E, Fabbrini M, Vitali F, Agamennone V, Dötsch A, Selberherr E, Grau JH, Meixner M, Liere K, Ercolini D, de Filippo C, Caderni G, Brigidi P, Turroni S. The Core Human Microbiome: Does It Exist and How Can We Find It? A Critical Review of the Concept. Nutrients 2022; 14:nu14142872. [PMID: 35889831 PMCID: PMC9323970 DOI: 10.3390/nu14142872] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/06/2022] [Accepted: 07/08/2022] [Indexed: 11/16/2022] Open
Abstract
The core microbiome, which refers to a set of consistent microbial features across populations, is of major interest in microbiome research and has been addressed by numerous studies. Understanding the core microbiome can help identify elements that lead to dysbiosis, and lead to treatments for microbiome-related health states. However, defining the core microbiome is a complex task at several levels. In this review, we consider the current state of core human microbiome research. We consider the knowledge that has been gained, the factors limiting our ability to achieve a reliable description of the core human microbiome, and the fields most likely to improve that ability. DNA sequencing technologies and the methods for analyzing metagenomics and amplicon data will most likely facilitate higher accuracy and resolution in describing the microbiome. However, more effort should be invested in characterizing the microbiome’s interactions with its human host, including the immune system and nutrition. Other components of this holobiontic system should also be emphasized, such as fungi, protists, lower eukaryotes, viruses, and phages. Most importantly, a collaborative effort of experts in microbiology, nutrition, immunology, medicine, systems biology, bioinformatics, and machine learning is probably required to identify the traits of the core human microbiome.
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Affiliation(s)
- Itai Sharon
- Migal-Galilee Research Institute, P.O. Box 831, Kiryat Shmona 11016, Israel
- Faculty of Sciences and Technology, Tel-Hai Academic College, Upper Galilee 1220800, Israel
- Correspondence:
| | - Narciso Martín Quijada
- Unit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, A-1210 Vienna, Austria; (N.M.Q.); (E.S.)
- Austrian Competence Centre for Feed and Food Quality, Safety and Innovation, FFoQSI GmbH, A-3430 Tulln an der Donau, Austria
| | - Edoardo Pasolli
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, 80055 Portici, Italy; (E.P.); (D.E.)
- Task Force on Microbiome Studies, University of Naples Federico II, 80055 Portici, Italy
| | - Marco Fabbrini
- Unit of Microbiome Science and Biotechnology, Department of Pharmacy and Biotechnology, University of Bologna, 40126 Bologna, Italy; (M.F.); (S.T.)
- Microbiomics Unit, Department of Medical and Surgical Sciences, University of Bologna, 40138 Bologna, Italy;
| | - Francesco Vitali
- Institute of Agricultural Biology and Biotechnology (IBBA), National Research Council (CNR), Via Moruzzi 1, 56124 Pisa, Italy; (F.V.); (C.d.F.)
| | - Valeria Agamennone
- Microbiology and Systems Biology, Netherlands Organization for Applied Scientific Research (TNO), Utrechtseweg 48, 3704 HE Zeist, The Netherlands;
| | - Andreas Dötsch
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut (MRI)-Federal Research Institute of Nutrition and Food, 76131 Karlsruhe, Germany;
| | - Evelyne Selberherr
- Unit of Food Microbiology, Institute of Food Safety, Food Technology and Veterinary Public Health, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, A-1210 Vienna, Austria; (N.M.Q.); (E.S.)
| | - José Horacio Grau
- Amedes Genetics, Amedes Medizinische Dienstleistungen GmbH, 10117 Berlin, Germany; (J.H.G.); (M.M.); (K.L.)
- Center for Species Survival, Smithsonian Conservation Biology Institute, Washington, DC 20008, USA
| | - Martin Meixner
- Amedes Genetics, Amedes Medizinische Dienstleistungen GmbH, 10117 Berlin, Germany; (J.H.G.); (M.M.); (K.L.)
| | - Karsten Liere
- Amedes Genetics, Amedes Medizinische Dienstleistungen GmbH, 10117 Berlin, Germany; (J.H.G.); (M.M.); (K.L.)
| | - Danilo Ercolini
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, 80055 Portici, Italy; (E.P.); (D.E.)
- Task Force on Microbiome Studies, University of Naples Federico II, 80055 Portici, Italy
| | - Carlotta de Filippo
- Institute of Agricultural Biology and Biotechnology (IBBA), National Research Council (CNR), Via Moruzzi 1, 56124 Pisa, Italy; (F.V.); (C.d.F.)
| | - Giovanna Caderni
- NEUROFARBA Department, Pharmacology and Toxicology Section, University of Florence, Viale Pieraccini 6, 50139 Florence, Italy;
| | - Patrizia Brigidi
- Microbiomics Unit, Department of Medical and Surgical Sciences, University of Bologna, 40138 Bologna, Italy;
| | - Silvia Turroni
- Unit of Microbiome Science and Biotechnology, Department of Pharmacy and Biotechnology, University of Bologna, 40126 Bologna, Italy; (M.F.); (S.T.)
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Wagner A. Competition for nutrients increases invasion resistance during assembly of microbial communities. Mol Ecol 2022; 31:4188-4203. [PMID: 35713370 PMCID: PMC9542400 DOI: 10.1111/mec.16565] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 06/08/2022] [Accepted: 06/10/2022] [Indexed: 12/02/2022]
Abstract
The assembly of microbial communities through sequential invasions of microbial species is challenging to study experimentally. Here, I used genome‐scale metabolic models of multiple species to model community assembly. Each such model represents all known biochemical reactions that a species uses to build biomass from nutrients in the environment. Species interactions in such models emerge from first biochemical principles, either through competition for environmental nutrients, or through cross‐feeding on metabolic by‐products excreted by resident species. I used these models to study 250 community assembly sequences. In each such sequence, a community changes through successive species invasions. During the 250 assembly sequences, communities become more species‐rich and invasion‐resistant. Resistance against both constructive and destructive invasions – those that entail species extinction – is associated with high community productivity, high biomass, and low concentrations of unused carbon. Competition for nutrients outweighs the influence of cross‐feeding on the growth rate of individual species. In a community assembly network of all communities that arise during the 250 assembly sequences, some communities occur more often than expected by chance. These include invasion resistant “attractor” communities with high biomass that arise late in community assembly and persist preferentially because of their invasion resistance. Genome‐scale metabolic models can reveal generic properties of microbial communities that are independent of the resident species and the environment.
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Affiliation(s)
- Andreas Wagner
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.,Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Genopode, Lausanne, Switzerland.,The Santa Fe Institute, Santa Fe, New Mexico, USA.,Stellenbosch Institute for Advanced Study (STIAS), Wallenberg Research Centre at Stellenbosch University, Stellenbosch, South Africa
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Grist SM, Bennewith KL, Cheung KC. Oxygen Measurement in Microdevices. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2022; 15:221-246. [PMID: 35696522 DOI: 10.1146/annurev-anchem-061020-111458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Oxygen plays a fundamental role in respiration and metabolism, and quantifying oxygen levels is essential in many environmental, industrial, and research settings. Microdevices facilitate the study of dynamic, oxygen-dependent effects in real time. This review is organized around the key needs for oxygen measurement in microdevices, including integrability into microfabricated systems; sensor dynamic range and sensitivity; spatially resolved measurements to map oxygen over two- or three-dimensional regions of interest; and compatibility with multimodal and multianalyte measurements. After a brief overview of biological readouts of oxygen, followed by oxygen sensor types that have been implemented in microscale devices and sensing mechanisms, this review presents select recent applications in organs-on-chip in vitro models and new sensor capabilities enabling oxygen microscopy, bioprocess manufacturing, and pharmaceutical industries. With the advancement of multiplexed, interconnected sensors and instruments and integration with industry workflows, intelligent microdevice-sensor systems including oxygen sensors will have further impact in environmental science, manufacturing, and medicine.
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Affiliation(s)
- Samantha M Grist
- School of Biomedical Engineering, Centre for Blood Research, University of British Columbia, Vancouver, British Columbia, Canada;
| | - Kevin L Bennewith
- Integrative Oncology Department, BC Cancer Research Institute, Vancouver, British Columbia, Canada
| | - Karen C Cheung
- School of Biomedical Engineering, Centre for Blood Research, University of British Columbia, Vancouver, British Columbia, Canada;
- Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia, Canada
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48
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Hypoxia-driven metabolic heterogeneity and immune evasive behaviour of gastrointestinal cancers: Elements of a recipe for disaster. Cytokine 2022; 156:155917. [PMID: 35660715 DOI: 10.1016/j.cyto.2022.155917] [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: 02/01/2022] [Revised: 04/28/2022] [Accepted: 05/16/2022] [Indexed: 11/24/2022]
Abstract
Gastrointestinal (GI) cancers refer to a group of malignancies associated with the GI tract (GIT). Like other solid tumors, hypoxic regions consistently feature inside the GI tumor microenvironment (TME) and contribute towards metabolic reprogramming of tumor-resident cells by modulating hypoxia-induced factors. We highlight here how the metabolic crosstalk between cancer cells and immune cells generate immunosuppressive environment inside hypoxic tumors. Given the fluctuating nature of tumor hypoxia, the metabolic fluxes between immune cells and cancer cells change dynamically. These changes alter cellular phenotypes and functions, resulting in the acceleration of cancer progression. These evolved properties of hypoxic tumors make metabolism-targeting monotherapy approaches or immunotherapy-measures unsuccessful. The current review highlights the advantages of combined immunometabolic treatment strategies to target hypoxic GI cancers and also identifies research areas to develop better combinational therapeutics for future.
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Panigrahi MK, Kaliaperumal V, Akella A, Venugopal G, Ramadass B. Mapping microbiome-redox spectrum and evaluating Microbial-Redox Index in chronic gastritis. Sci Rep 2022; 12:8450. [PMID: 35589904 PMCID: PMC9120160 DOI: 10.1038/s41598-022-12431-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 05/11/2022] [Indexed: 12/27/2022] Open
Abstract
Peptic ulcer disease (PUD) and chronic gastritis are prevalent in developing countries. The role of oxidative stress in the pathogenesis of gastrointestinal mucosal disorders is well recognized. In PUD, the gastric mucosa and its associated microbiome are subject to diet and stress-induced oxidative perturbations. Tissue redox potential (ORP) measurement can quantify oxidative stress, reflecting the balance between prooxidants and antioxidants. This study hypothesizes that the oxidative stress quantified by tissue ORP will be associated with characteristic changes in the mucosa-associated microbiome in PUD and gastritis. In addition, we propose using relative microbial abundance as a quantitative marker of mucosal health. Endoscopy was performed to obtain gastric mucosal biopsies from ten PUD and ten non-ulcer dyspepsia (NUD) patients. The tissue ORP was measured directly with a microelectrode using a biopsy specimen. A second specimen from an adjacent site was subjected to 16s rRNA gene sequencing. From the OTUs, the relative abundance of the microbial taxon in each of the samples was derived. We analyzed the genome of the predominant species for genes encoding the utilization of oxygen as an electron acceptor in respiration and for the presence of antioxidant defense mechanisms. The organisms were then grouped based on their established and inferred redox traits. Shannon diversity index and Species richness were calculated on rarefied data. The relative abundance of organisms that prefer high ORP over those that favor low ORP is conceived as the “Microbial Redox Index (MRI),” an indicator of mucosal health. In the gastric mucosa, aerobic species predominate and are more diverse than the anaerobes. The predominant aerobes are Helicobacter pylori and Sphingobacterium mizutaii. The abundance of these two species had an inverse correlation with the abundance of low ORP preferring anaerobes. Their relative abundance ratio (Microbial Redox Index) correlated with the tissue oxidation–reduction potential (ORP), a direct measure of oxidative stress. Correlation analysis also revealed that the abundance of all anaerobes inversely correlated with the dominant aerobic taxa. In addition, Shannon and Species richness diversity indices, the probable indicators of mucosal health, were negatively correlated with Microbial Redox Index. Using PUD as a prototype mucosal disease, this article describes a generalized approach to infer and quantify mucosal oxidative stress by analyzing the relative abundance of microorganisms that preferentially grow at the extremes of the tissue redox potential. This ratiometric Microbial Redox Index can also be assessed using simple qPCR without the need for sequencing. The approach described herein may be helpful as a widely applicable quantitative measure of mucosal health with prognostic and therapeutic implications.
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Affiliation(s)
- Manas Kumar Panigrahi
- Department of Gastroenterology, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Venkatesh Kaliaperumal
- MYAS-NIN Department of Sports Science, ICMR-National Institute of Nutrition, Hyderabad, India
| | - Abhishek Akella
- Center of Excellence for Clinical Microbiome Research, All India Institute of Medical Sciences, Bhubaneswar, 751019, India
| | - Giriprasad Venugopal
- Center of Excellence for Clinical Microbiome Research, All India Institute of Medical Sciences, Bhubaneswar, 751019, India
| | - Balamurugan Ramadass
- Center of Excellence for Clinical Microbiome Research, All India Institute of Medical Sciences, Bhubaneswar, 751019, India. .,Department of Biochemistry, All India Institute of Medical Sciences, Bhubaneswar, India.
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50
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Significance of Mucosa-Associated Microbiota and Its Impacts on Intestinal Health of Pigs Challenged with F18 +E. coli. Pathogens 2022; 11:pathogens11050589. [PMID: 35631110 PMCID: PMC9145386 DOI: 10.3390/pathogens11050589] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 05/05/2022] [Accepted: 05/14/2022] [Indexed: 01/27/2023] Open
Abstract
The objective of this study was to evaluate the significance of jejunal mucosa-associated microbiota and its impacts on the intestinal health of pigs challenged with F18+ Escherichia coli. Forty-four newly-weaned pigs were allotted to two treatments in a randomized complete block design with sex as blocks. Pigs were fed common diets for 28 d. At d 7 post-weaning, pigs were orally inoculated with saline solution or F18+ E. coli. At d 21 post-challenge, feces and blood were collected and pigs were euthanized to collect jejunal tissue to evaluate microbiota and intestinal health parameters. The relative abundance of Firmicutes and Bacteroidetes was lower (p < 0.05) in jejunal mucosa than in feces, whereas Proteobacteria was greater (p < 0.05) in jejunal mucosa. F18+ E. coli increased (p < 0.05) protein carbonyl, Helicobacteraceae, Pseudomonadaceae, Xanthomonadaceae, and Peptostreptococcaceae and reduced (p < 0.05) villus height, Enterobacteriaceae, Campylobacteraceae, Brachyspiraceae, and Caulobacteraceae in jejunal mucosa, whereas it reduced (p < 0.05) Spirochaetaceae and Oscillospiraceae in feces. Collectively, jejunal mucosa-associated microbiota differed from those in feces. Compared with fecal microbiota, the change of mucosa-associated microbiota by F18+ E. coli was more prominent, and it was mainly correlated with increased protein carbonyl and reduced villus height in jejunal mucosa impairing the intestinal health of nursery pigs.
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