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Jensen O, Trujillo E, Hanson L, Ost KS. Controlling Candida: immune regulation of commensal fungi in the gut. Infect Immun 2024:e0051623. [PMID: 38647290 DOI: 10.1128/iai.00516-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024] Open
Abstract
The intestinal microbiome harbors fungi that pose a significant risk to human health as opportunistic pathogens and drivers of inflammation. Inflammatory and autoimmune diseases are associated with dysbiotic fungal communities and the expansion of potentially pathogenic fungi. The gut is also the main reservoir for disseminated fungal infections. Immune interactions are critical for preventing commensal fungi from becoming pathogenic. Significant strides have been made in defining innate and adaptive immune pathways that regulate intestinal fungi, and these discoveries have coincided with advancements in our understanding of the fungal molecular pathways and effectors involved in both commensal colonization and pathogenesis within the gut. In this review, we will discuss immune interactions important for regulating commensal fungi, with a focus on how specific cell types and effectors interact with fungi to limit their colonization or pathogenic potential. This will include how innate and adaptive immune pathways target fungi and orchestrate antifungal immune responses, in addition to how secreted immune effectors, such as mucus and antimicrobial peptides, regulate fungal colonization and inhibit pathogenic potential. These immune interactions will be framed around our current understanding of the fungal effectors and pathways regulating colonization and pathogenesis within this niche. Finally, we highlight important unexplored mechanisms by which the immune system regulates commensal fungi in the gut.
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Affiliation(s)
- Owen Jensen
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Emma Trujillo
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Luke Hanson
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Kyla S Ost
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
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Cheng OJ, Lebish EJ, Jensen O, Jacenik D, Trivedi S, Cacioppo J, Aubé J, Beswick EJ, Leung DT. MAIT Cells Modulate Innate Immune Cells and Inhibit Colon Cancer Growth. bioRxiv 2024:2024.01.16.575894. [PMID: 38293128 PMCID: PMC10827136 DOI: 10.1101/2024.01.16.575894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Mucosal-associated invariant T (MAIT) cells are innate-like T cells that can be activated by microbial antigens and cytokines and are abundant in mucosal tissues including the colon. MAIT cells have cytotoxic and pro-inflammatory functions and have potentials for use as adoptive cell therapy. However, studies into their anti-cancer activity, including their role in colon cancer, are limited. Using an animal model of colon cancer, we show that peritumoral injection of in vivo-expanded MAIT cells into RAG1-/- mice with MC38-derived tumors inhibits tumor growth compared to control. Multiplex cytokine analyses show that tumors from the MAIT cell-treated group have higher expression of markers for eosinophil-activating cytokines, suggesting an association between eosinophil recruitment and tumor inhibition. In a human peripheral leukocyte co-culture model, we show that leukocytes stimulated with MAIT ligand show an increase in eotaxin-1 production and activation of eosinophils, associated with increased cancer cell killing. In conclusion, we show that MAIT cells have a protective role in a murine colon cancer model, associated with modulation of the immune response to cancer, potentially involving eosinophil-associated mechanisms. Our results highlight the potential of MAIT cells for non-donor restricted colon cancer immunotherapy.
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Affiliation(s)
- Olivia J. Cheng
- Division of Microbiology & Immunology, Department of Pathology, University of Utah, Salt Lake City, Utah, United States
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
| | - Eric J. Lebish
- Division of Gastroenterology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
| | - Owen Jensen
- Division of Microbiology & Immunology, Department of Pathology, University of Utah, Salt Lake City, Utah, United States
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
| | - Damian Jacenik
- Division of Gastroenterology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Shubhanshi Trivedi
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
| | - Jackson Cacioppo
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Jeffrey Aubé
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Ellen J. Beswick
- Division of Gastroenterology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
- Division of Digestive Diseases and Nutrition, Department of Internal Medicine, University of Kentucky, Lexington, Kentucky, United States
| | - Daniel T. Leung
- Division of Microbiology & Immunology, Department of Pathology, University of Utah, Salt Lake City, Utah, United States
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
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3
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Clutter CH, Klarman MB, Cajusma Y, Cato ET, Abu Sayeed M, Brinkley L, Jensen O, Baril C, De Rochars VMB, Azman AS, Long MT, Cummings D, Leung DT, Nelson EJ. Population-Based Serologic Survey of Vibrio cholerae Antibody Titers before Cholera Outbreak, Haiti, 2022. Emerg Infect Dis 2023; 29:1864-1867. [PMID: 37487168 PMCID: PMC10461687 DOI: 10.3201/eid2909.230174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023] Open
Abstract
A Vibrio cholerae O1 outbreak emerged in Haiti in October 2022 after years of cholera absence. In samples from a 2021 serosurvey, we found lower circulating antibodies against V. cholerae lipopolysaccharide in children <5 years of age and no vibriocidal antibodies, suggesting high susceptibility to cholera, especially among young children.
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Affiliation(s)
| | | | - Youseline Cajusma
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Emilee T. Cato
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Md. Abu Sayeed
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Lindsey Brinkley
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Owen Jensen
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Chantale Baril
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - V. Madsen Beau De Rochars
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Andrew S. Azman
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Maureen T. Long
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
| | - Derek Cummings
- University of Utah, Salt Lake City, Utah, USA (C.H. Clutter, O. Jensen, D.T. Leung)
- University of Florida, Gainesville, Florida, USA (M.B. Klarman, Y. Cajusma, E.T. Cato, M.A. Sayeed, L. Brinkley, V.M. Beau De Rochars, M.T. Long, D. Cummings, E.J. Nelson)
- Université d'État d'Haïti, Port au Prince, Haiti (C. Baril)
- Johns Hopkins University, Baltimore, Maryland, USA (A.S. Azman)
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Clutter CH, Klarman MB, Cajusma Y, Cato ET, Sayeed A, Brinkley L, Jensen O, Baril C, De Rochars VMB, Azman AS, Long MT, Cummings D, Leung DT, Nelson EJ. A population-based serological survey of Vibrio cholerae antibody titers in Ouest Department, Haiti in the year prior to the 2022 cholera outbreak. medRxiv 2023:2023.02.06.23285537. [PMID: 36798289 PMCID: PMC9934795 DOI: 10.1101/2023.02.06.23285537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
After three years with no confirmed cholera cases in Haiti, an outbreak of Vibrio cholerae O1 emerged in October 2022. Levels of pre-existing antibodies provide an estimate of prior immunologic exposure, reveal potentially relevant immune responses, and set a baseline for future serosurveillance. We analyzed dried blood spots collected in 2021 from a population-weighted representative cross-sectional serosurvey in two communes in the Ouest Department of Haiti. We found lower levels of circulating IgG and IgA antibodies against V. cholerae lipopolysaccharide (LPS, IgG and IgA p<0.0001) in those below 5 years of age compared to those five years and older. Among a subset of patients with higher titers of antibodies, we were unable to detect any functional (vibriocidal) antibodies. In conclusion, the lack of detectable functional antibodies, and age-discordant levels of V. cholerae LPS IgG, suggest that populations in Haiti may be highly susceptible to cholera disease, especially among young children.
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Affiliation(s)
- Christy H. Clutter
- Division of Infectious Disease, University of Utah, Salt Lake City, Utah, USA
- Division of Microbiology & Immunology, University of Utah, Salt Lake City, Utah, USA
| | - Molly B. Klarman
- University of Florida, Departments of Pediatrics and Environmental and Global Health, Gainesville, Florida, USA
| | - Youseline Cajusma
- University of Florida, Departments of Pediatrics and Environmental and Global Health, Gainesville, Florida, USA
| | - Emilie T. Cato
- University of Florida, Departments of Pediatrics and Environmental and Global Health, Gainesville, Florida, USA
| | - Abu Sayeed
- University of Florida, Departments of Pediatrics and Environmental and Global Health, Gainesville, Florida, USA
| | - Lindsey Brinkley
- University of Florida, Departments of Pediatrics and Environmental and Global Health, Gainesville, Florida, USA
| | - Owen Jensen
- Division of Microbiology & Immunology, University of Utah, Salt Lake City, Utah, USA
| | | | - V. Madsen Beau De Rochars
- Department of Health Services Research, Management and Policy, School of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA
| | - Andrew S. Azman
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Maureen T. Long
- Department of Comparative Diagnostic and Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
- University of Florida, Emerging Pathogens Institute, Gainesville, Florida, USA
| | - Derek Cummings
- Department of Comparative Diagnostic and Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
- University of Florida, Emerging Pathogens Institute, Gainesville, Florida, USA
| | - Daniel T. Leung
- Division of Infectious Disease, University of Utah, Salt Lake City, Utah, USA
- Division of Microbiology & Immunology, University of Utah, Salt Lake City, Utah, USA
| | - Eric J. Nelson
- Department of Comparative Diagnostic and Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
- University of Florida, Emerging Pathogens Institute, Gainesville, Florida, USA
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Jensen O, Trivedi S, Cacioppo JG, Li K, Aubé J, Hale JS, Ryan ET, Leung DT. Erratum to: Use of a MAIT-Activating Ligand, 5-OP-RU, as a Mucosal Adjuvant in a Murine Model of Vibrio cholerae O1 Vaccination. Pathog Immun 2022; 7:145-146. [PMID: 36147447 PMCID: PMC9487527 DOI: 10.20411/pai.v7i1.541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 09/08/2022] [Indexed: 01/13/2023] Open
Abstract
[This corrects the article DOI: 10.20411/pai.v7i1.525.].
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Affiliation(s)
- Owen Jensen
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Shubhanshi Trivedi
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
| | - Jackson G. Cacioppo
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kelin Li
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jeffrey Aubé
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - J. Scott Hale
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Edward T. Ryan
- Division of Infectious Disease, Massachusetts General Hospital, Boston, Massachusetts
- Department of Medicine, Harvard Medical School, Boston, Massachusetts
- Department of Immunology and Infectious diseases, Harvard School of Public Health, Boston, Massachusetts
| | - Daniel T. Leung
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
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Jensen O, Trivedi S, Li K, Aubé J, Hale JS, Ryan ET, Leung DT. Use of a MAIT-Activating Ligand, 5-OP-RU, as a Mucosal Adjuvant in a Murine Model of Vibrio cholerae O1 Vaccination. Pathog Immun 2022; 7:122-144. [PMID: 36072570 PMCID: PMC9438945 DOI: 10.20411/pai.v7i1.525] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 07/14/2022] [Indexed: 11/23/2022] Open
Abstract
Background Mucosal-associated invariant T (MAIT) cells are innate-like T cells enriched in the mucosa with capacity for B-cell help. We hypothesize that targeting MAIT cells, using a MAIT-activating ligand as an adjuvant, could improve mucosal vaccine responses to bacterial pathogens such as Vibrio cholerae. Methods We utilized murine models of V. cholerae vaccination to test the adjuvant potential of the MAIT-activating ligand, 5-(2-oxopropylideneamino)-6-D-ribitylaminouracil (5-OP-RU). We measured V. cholerae-specific antibody and antibody-secreting cell responses and used flow cytometry to examine MAIT-cell and B-cell phenotype, in blood, bronchoalveolar lavage fluid (BALF), and mucosal tissues, following intranasal vaccination with live V. cholerae O1 or a V. cholerae O1 polysaccharide conjugate vaccine. Results We report significant expansion of MAIT cells in the lungs (P < 0.001) and BALF (P < 0.001) of 5-OP-RU treated mice, and higher mucosal (BALF, P = 0.045) but not systemic (serum, P = 0.21) V. cholerae O-specific-polysaccharide IgG responses in our conjugate vaccine model when adjuvanted with low-dose 5-OP-RU. In contrast, despite significant MAIT cell expansion, no significant differences in V. cholerae-specific humoral responses were found in our live V. cholerae vaccination model. Conclusions Using a murine model, we demonstrate the potential, as well as the limitations, of targeting MAIT cells to improve antibody responses to mucosal cholera vaccines. Our study highlights the need for future research optimizing MAIT-cell targeting for improving mucosal vaccines.
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Affiliation(s)
- Owen Jensen
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Shubhanshi Trivedi
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
| | - Kelin Li
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jeffrey Aubé
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - J. Scott Hale
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Edward T. Ryan
- Division of Infectious Disease, Massachusetts General Hospital, Boston, Massachusetts
- Department of Medicine, Harvard Medical School, Boston, Massachusetts
- Department of Immunology and Infectious diseases, Harvard School of Public Health, Boston, Massachusetts
| | - Daniel T. Leung
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
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7
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Graham CT, O'Connor I, Broderick L, Broderick M, Jensen O, Lally HT. Drones can reliably, accurately and with high levels of precision, collect large volume water samples and physio-chemical data from lakes. Sci Total Environ 2022; 824:153875. [PMID: 35181365 DOI: 10.1016/j.scitotenv.2022.153875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 01/17/2022] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
The rapid development and application of drone technology has included water sampling and collection of physiochemical data from lakes. Previous research has demonstrated the significant potential of drones to play a future pivotal role in the collection of such data from lakes that fulfil requirements of large-scale monitoring programmes. However, currently the utilisation of drone technology for water quality monitoring is hindered by a number of important limitations: i) the low rate of successful sample captured; ii) the relatively low volume of water sample retrieved for analyses of multiple water chemistry parameters; and critically iii) differences between water chemistry parameters when using a drone versus samples collected by boat. Here we present results comparing the water chemistry results of a large number of parameters (pH, dissolved oxygen concentration, temperature, conductivity, alkalinity, hardness, true colour, chloride, silica, ammonia, total oxidised nitrogen, nitrite, nitrate, ortho-phosphate, total phosphorous and chlorophyll) sampled via drone with samples collected by boat in a number of lakes. The drone water sampling method used here is the first to collect a sufficiently large volume of water to meet the monitoring requirements of large scale water monitoring programmes, 2 L, at a 100% success rate and most crucially, with water chemistry variables that are not significantly different to those taken using traditional boat water sampling. This study therefore shows that drone technology can be utilised to collect water chemistry data and samples from lakes in a reliable, more rapid and cost effective manner than traditional sampling using boats, that is safer for personnel and poses less of a biosecurity risk.
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Affiliation(s)
- C T Graham
- Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology (GMIT), Dublin Road, Galway City, Ireland.
| | - I O'Connor
- Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology (GMIT), Dublin Road, Galway City, Ireland.
| | - L Broderick
- Model Heli Services, Belltrees, Inch, Ennis, Co. Clare, Ireland.
| | - M Broderick
- Model Heli Services, Belltrees, Inch, Ennis, Co. Clare, Ireland
| | - O Jensen
- University of Wisconsin-Madison, Center for Limnology, Madison, WI, United States of America.
| | - H T Lally
- Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology (GMIT), Dublin Road, Galway City, Ireland.
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Bhuiyan TR, Rahman MA, Trivedi S, Afroz T, Al Banna H, Hoq MR, Pop I, Jensen O, Rashu R, Uddin MI, Hossain M, Khan AI, Chowdhury F, Harris JB, Calderwood SB, Ryan ET, Qadri F, Leung DT. Mucosal-Associated Invariant T (MAIT) cells are highly activated in duodenal tissue of humans with Vibrio cholerae O1 infection: A preliminary report. PLoS Negl Trop Dis 2022; 16:e0010411. [PMID: 35551522 PMCID: PMC9129025 DOI: 10.1371/journal.pntd.0010411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/24/2022] [Accepted: 04/11/2022] [Indexed: 01/13/2023] Open
Abstract
Mucosal-associated invariant T (MAIT) cells are unconventional T lymphocytes with a semi-conserved TCRα, activated by the presentation of vitamin B metabolites by the MHC-I related protein, MR1, and with diverse innate and adaptive effector functions. The role of MAIT cells in acute intestinal infections, especially at the mucosal level, is not well known. Here, we analyzed the presence and phenotype of MAIT cells in duodenal biopsies and paired peripheral blood samples, in patients during and after culture-confirmed Vibrio cholerae O1 infection. Immunohistochemical staining of duodenal biopsies from cholera patients (n = 5, median age 32 years, range 26-44, 1 female) identified MAIT cells in the lamina propria of the crypts, but not the villi. By flow cytometry (n = 10, median age 31 years, range 23-36, 1 female), we showed that duodenal MAIT cells are more activated than peripheral MAIT cells (p < 0.01 across time points), although there were no significant differences between duodenal MAIT cells at day 2 and day 30. We found fecal markers of intestinal permeability and inflammation to be correlated with the loss of duodenal (but not peripheral) MAIT cells, and single-cell sequencing revealed differing T cell receptor usage between the duodenal and peripheral blood MAIT cells. In this preliminary report limited by a small sample size, we show that MAIT cells are present in the lamina propria of the duodenum during V. cholerae infection, and more activated than those in the blood. Future work into the trafficking and tissue-resident function of MAIT cells is warranted.
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Affiliation(s)
- Taufiqur R. Bhuiyan
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - M. Arifur Rahman
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Shubhanshi Trivedi
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Taliman Afroz
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Hasan Al Banna
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Mohammad Rubel Hoq
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Ioana Pop
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Owen Jensen
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
- Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Rasheduzzaman Rashu
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | | | - Motaher Hossain
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Ashraful I. Khan
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Fahima Chowdhury
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Jason B. Harris
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Pediatrics, MassGeneral Hospital for Children, Boston, Massachusetts, United States of America
- Division of Pediatric Global Health, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Stephen B. Calderwood
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Edward T. Ryan
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America
| | - Firdausi Qadri
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
| | - Daniel T. Leung
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
- Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
- * E-mail:
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9
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Jensen O, Trivedi S, Meier JD, Fairfax KC, Hale JS, Leung DT. A subset of follicular helper-like MAIT cells can provide B cell help and support antibody production in the mucosa. Sci Immunol 2022; 7:eabe8931. [PMID: 35030034 DOI: 10.1126/sciimmunol.abe8931] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Owen Jensen
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA.,Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT ,USA
| | - Shubhanshi Trivedi
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Jeremy D Meier
- Division of Otolaryngology-Head and Neck Surgery, University of Utah School of Medicine, Salt Lake City, UT, USA.,Primary Children's Hospital, Salt Lake City, UT, USA
| | - Keke C Fairfax
- Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT ,USA
| | - J Scott Hale
- Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT ,USA
| | - Daniel T Leung
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA.,Division of Microbiology and Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT ,USA
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10
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Ryan ET, Leung DT, Jensen O, Weil AA, Bhuiyan TR, Khan AI, Chowdhury F, LaRocque RC, Harris JB, Calderwood SB, Qadri F, Charles RC. Systemic, Mucosal, and Memory Immune Responses following Cholera. Trop Med Infect Dis 2021; 6:192. [PMID: 34842841 PMCID: PMC8628923 DOI: 10.3390/tropicalmed6040192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/21/2021] [Accepted: 10/23/2021] [Indexed: 01/13/2023] Open
Abstract
Vibrio cholerae O1, the major causative agent of cholera, remains a significant public health threat. Although there are available vaccines for cholera, the protection provided by killed whole-cell cholera vaccines in young children is poor. An obstacle to the development of improved cholera vaccines is the need for a better understanding of the primary mechanisms of cholera immunity and identification of improved correlates of protection. Considerable progress has been made over the last decade in understanding the adaptive and innate immune responses to cholera disease as well as V. cholerae infection. This review will assess what is currently known about the systemic, mucosal, memory, and innate immune responses to clinical cholera, as well as recent advances in our understanding of the mechanisms and correlates of protection against V. cholerae O1 infection.
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Affiliation(s)
- Edward T. Ryan
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA 02114, USA; (E.T.R.); (R.C.L.); (J.B.H.); (S.B.C.)
- Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Daniel T. Leung
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT 84132, USA; (D.T.L.); (O.J.)
| | - Owen Jensen
- Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT 84132, USA; (D.T.L.); (O.J.)
| | - Ana A. Weil
- Division of Allergy and Infectious Diseases, University of Washington, Seattle, WA 98109, USA;
| | - Taufiqur Rahman Bhuiyan
- International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka 1212, Bangladesh; (T.R.B.); (A.I.K.); (F.C.); (F.Q.)
| | - Ashraful Islam Khan
- International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka 1212, Bangladesh; (T.R.B.); (A.I.K.); (F.C.); (F.Q.)
| | - Fahima Chowdhury
- International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka 1212, Bangladesh; (T.R.B.); (A.I.K.); (F.C.); (F.Q.)
| | - Regina C. LaRocque
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA 02114, USA; (E.T.R.); (R.C.L.); (J.B.H.); (S.B.C.)
- Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Jason B. Harris
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA 02114, USA; (E.T.R.); (R.C.L.); (J.B.H.); (S.B.C.)
- Department of Pediatrics, MassGeneral Hospital for Children, Boston, MA 02114, USA
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, MA 02115, USA
- Division of Pediatric Global Health, Massachusetts General Hospital, Boston, MA 02115, USA
| | - Stephen B. Calderwood
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA 02114, USA; (E.T.R.); (R.C.L.); (J.B.H.); (S.B.C.)
- Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
- Department of Microbiology, Harvard Medical School, Boston, MA 02115, USA
| | - Firdausi Qadri
- International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka 1212, Bangladesh; (T.R.B.); (A.I.K.); (F.C.); (F.Q.)
| | - Richelle C. Charles
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA 02114, USA; (E.T.R.); (R.C.L.); (J.B.H.); (S.B.C.)
- Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
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11
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Trivedi S, Grossmann AH, Jensen O, Cody MJ, Wahlig TA, Hayakawa Serpa P, Langelier C, Warren KJ, Yost CC, Leung DT. Intestinal Infection Is Associated With Impaired Lung Innate Immunity to Secondary Respiratory Infection. Open Forum Infect Dis 2021; 8:ofab237. [PMID: 34189172 PMCID: PMC8231398 DOI: 10.1093/ofid/ofab237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/05/2021] [Indexed: 11/23/2022] Open
Abstract
Background Pneumonia and diarrhea are among the leading causes of death worldwide, and epidemiological studies have demonstrated that diarrhea is associated with an increased risk of subsequent pneumonia. Our aim was to determine the impact of intestinal infection on innate immune responses in the lung. Methods Using a mouse model of intestinal infection by Salmonella enterica serovar Typhimurium (S. Typhimurium [ST]), we investigated associations between gastrointestinal infections and lung innate immune responses to bacterial (Klebsiella pneumoniae) challenge. Results We found alterations in frequencies of innate immune cells in the lungs of intestinally infected mice compared with uninfected mice. On subsequent challenge with K. pneumoniae, we found that mice with prior intestinal infection have higher lung bacterial burden and inflammation, increased neutrophil margination, and neutrophil extracellular traps, but lower overall numbers of neutrophils, compared with mice without prior intestinal infection. Total numbers of dendritic cells, innate-like T cells, and natural killer cells were not different between mice with and without prior intestinal infection. Conclusions Together, these results suggest that intestinal infection impacts lung innate immune responses, most notably neutrophil characteristics, potentially resulting in increased susceptibility to secondary pneumonia.
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Affiliation(s)
- Shubhanshi Trivedi
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Allie H Grossmann
- Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah, USA.,Division of Anatomic Pathology, Department of Pathology, University of Utah, Salt Lake City, Utah, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
| | - Owen Jensen
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Mark J Cody
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA
| | - Taylor A Wahlig
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Paula Hayakawa Serpa
- Chan Zuckerberg Biohub, San Francisco, California, USA.,Division of Infectious Diseases, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Charles Langelier
- Chan Zuckerberg Biohub, San Francisco, California, USA.,Division of Infectious Diseases, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Kristi J Warren
- Division of Pulmonary Medicine, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Christian C Yost
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
| | - Daniel T Leung
- Division of Infectious Disease, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, Utah, USA
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12
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Jensen O, Trivedi S, Meier JD, Fairfax K, Hale S, Leung DT. A novel subset of follicular helper-like MAIT cells has capacity for B cell help and antibody production in the mucosa. The Journal of Immunology 2021. [DOI: 10.4049/jimmunol.206.supp.55.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Abstract
Mucosal-associated invariant T (MAIT) cells are innate-like T lymphocytes that respond to conserved microbial metabolites presented on the evolutionarily conserved MHC class I-related protein, MR1. MAIT cells are enriched in the mucosa and aid in protection against bacterial pathogens via release of inflammatory cytokines and cytotoxic molecules. Recent evidence suggests MAIT cells are capable of providing B cell help in vitro and in vivo. In this study, we used primary human samples and mouse models to uncover the role of MAIT cells in B cell help at the mucosa. Here we describe a novel population of CXCR5+ T follicular helper (Tfh)-like MAIT cells (MAITfh) that are enriched in human mucosal lymphoid tissues. Using in vitro culture assays and fluorescence imaging, we found that MAITfh cells preferentially locate within germinal centers in human tonsils and express the canonical Tfh transcription factor, B-cell lymphoma 6 (BCL-6), co-stimulatory markers, inducible T cell costimulator (ICOS), and programmed death receptor 1 (PD-1), and cytokines, interleukin (IL)-21, IL-10, and BAFF. Furthermore, we investigate the sufficiency of MAIT cells to aid in antibody mediated immunity in vivo using a mouse model of MAIT adoptive transfer followed by mucosal challenge with live Vibrio cholerae. We show that adoptive transfer of MAIT cells into αβ T cell deficient mice promotes B cell differentiation and increased serum V. cholerae-specific IgA and bactericidal responses. Our data demonstrate the capacity of MAIT cells to participate in adaptive immune responses at the mucosa, and suggest MAIT cells may be potential targets to improve mucosal vaccines.
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Affiliation(s)
- Owen Jensen
- 1Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, USA
- 2Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, USA
| | - Shubhanshi Trivedi
- 1Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, USA
| | - Jeremy D Meier
- 3Division of Otolaryngology-Head and Neck Surgery, University of Utah School of Medicine, Salt Lake City, USA
| | - Keke Fairfax
- 2Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, USA
| | - Scott Hale
- 2Division of Microbiology & Immunology, Department of Pathology, University of Utah School of Medicine, Salt Lake City, USA
| | - Daniel T Leung
- 1Division of Infectious Diseases, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, USA
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13
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Trivedi S, Labuz D, Anderson CP, Araujo CV, Blair A, Middleton EA, Jensen O, Tran A, Mulvey MA, Campbell RA, Hale JS, Rondina MT, Leung DT. Mucosal-associated invariant T (MAIT) cells mediate protective host responses in sepsis. eLife 2020; 9:e55615. [PMID: 33164745 PMCID: PMC7679140 DOI: 10.7554/elife.55615] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 11/09/2020] [Indexed: 12/12/2022] Open
Abstract
Sepsis is a systemic inflammatory response to infection and a leading cause of death. Mucosal-associated invariant T (MAIT) cells are innate-like T cells enriched in mucosal tissues that recognize bacterial ligands. We investigated MAIT cells during clinical and experimental sepsis, and their contribution to host responses. In experimental sepsis, MAIT-deficient mice had significantly increased mortality and bacterial load, and reduced tissue-specific cytokine responses. MAIT cells of WT mice expressed lower levels of IFN-γ and IL-17a during sepsis compared to sham surgery, changes not seen in non-MAIT T cells. MAIT cells of patients at sepsis presentation were significantly reduced in frequency compared to healthy donors, and were more activated, with decreased IFN-γ production, compared to both healthy donors and paired 90-day samples. Our data suggest that MAIT cells are highly activated and become dysfunctional during clinical sepsis, and contribute to tissue-specific cytokine responses that are protective against mortality during experimental sepsis.
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Affiliation(s)
- Shubhanshi Trivedi
- Division of Infectious Diseases, University of UtahSalt Lake CityUnited States
| | - Daniel Labuz
- Division of Infectious Diseases, University of UtahSalt Lake CityUnited States
| | - Cole P Anderson
- Division of Infectious Diseases, University of UtahSalt Lake CityUnited States
| | - Claudia V Araujo
- Molecular Medicine Program, University of UtahSalt Lake CityUnited States
| | - Antoinette Blair
- Molecular Medicine Program, University of UtahSalt Lake CityUnited States
| | - Elizabeth A Middleton
- Molecular Medicine Program, University of UtahSalt Lake CityUnited States
- Division of Pulmonary and Critical Care, University of UtahSalt Lake CityUnited States
| | - Owen Jensen
- Division of Infectious Diseases, University of UtahSalt Lake CityUnited States
| | - Alexander Tran
- Division of Microbiology and Immunology, Department of Pathology, University of UtahSalt Lake CityUnited States
| | - Matthew A Mulvey
- Division of Microbiology and Immunology, Department of Pathology, University of UtahSalt Lake CityUnited States
| | - Robert A Campbell
- Molecular Medicine Program, University of UtahSalt Lake CityUnited States
- Division of General Internal Medicine, Department of Internal Medicine, University of UtahSalt Lake CityUnited States
| | - J Scott Hale
- Division of Microbiology and Immunology, Department of Pathology, University of UtahSalt Lake CityUnited States
| | - Matthew T Rondina
- Molecular Medicine Program, University of UtahSalt Lake CityUnited States
- Division of General Internal Medicine, Department of Internal Medicine, University of UtahSalt Lake CityUnited States
- George E. Wahlen VAMC Department of Internal Medicine and GRECC, University of UtahSalt Lake CityUnited States
| | - Daniel T Leung
- Division of Infectious Diseases, University of UtahSalt Lake CityUnited States
- Division of Microbiology and Immunology, Department of Pathology, University of UtahSalt Lake CityUnited States
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14
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Olli KE, Rapp C, O’Connell L, Collins CB, McNamee EN, Jensen O, Jedlicka P, Allison KC, Goldberg MS, Gerich ME, Frank DN, Ir D, Robertson CE, Evans CM, Aherne CM. Muc5ac Expression Protects the Colonic Barrier in Experimental Colitis. Inflamm Bowel Dis 2020; 26:1353-1367. [PMID: 32385500 PMCID: PMC7441107 DOI: 10.1093/ibd/izaa064] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND The mucus gel layer (MGL) lining the colon is integral to exclusion of bacteria and maintaining intestinal homeostasis in health and disease. Some MGL defects allowing bacteria to directly contact the colonic surface are commonly observed in ulcerative colitis (UC). The major macromolecular component of the colonic MGL is the secreted gel-forming mucin MUC2, whose expression is essential for homeostasis in health. In UC, another gel-forming mucin, MUC5AC, is induced. In mice, Muc5ac is protective during intestinal helminth infection. Here we tested the expression and functional role of MUC5AC/Muc5ac in UC biopsies and murine colitis. METHODS We measured MUC5AC/Muc5ac expression in UC biopsies and in dextran sulfate sodium (DSS) colitis. We performed DSS colitis in mice deficient in Muc5ac (Muc5ac-/-) to model the potential functional role of Muc5ac in colitis. To assess MGL integrity, we quantified bacterial-epithelial interaction and translocation to mesenteric lymph nodes. Antibiotic treatment and 16S rRNA gene sequencing were performed to directly investigate the role of bacteria in murine colitis. RESULTS Colonic MUC5AC/Muc5ac mRNA expression increased significantly in active UC and murine colitis. Muc5ac-/- mice experienced worsened injury and inflammation in DSS colitis compared with control mice. This result was associated with increased bacterial-epithelial contact and translocation to the mesenteric lymph nodes. However, no change in microbial abundance or community composition was noted. Antibiotic treatment normalized colitis severity in Muc5ac-/- mice to that of antibiotic-treated control mice. CONCLUSIONS MUC5AC/Muc5ac induction in the acutely inflamed colon controls injury by reducing bacterial breach of the MGL.
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Affiliation(s)
- Kristine E Olli
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Caroline Rapp
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Lauren O’Connell
- School of Medicine, Conway Institute, University College Dublin, Belfield, Dublin, Ireland
| | - Colm B Collins
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
- Department of Pediatrics, Division of Gastroenterology, Hepatology and Nutrition, Digestive Health Institute, Children’s Hospital Colorado, Aurora, Colorado, USA
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin, Ireland
| | - Eoin N McNamee
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
- Kathleen Lonsdale Institute for Human Health Research, Department of Biology, Maynooth University, County Kildare, Ireland
| | - Owen Jensen
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Paul Jedlicka
- Department of Pathology, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Kristen C Allison
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Matthew S Goldberg
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Mark E Gerich
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Daniel N Frank
- Department of Medicine, Division of Infectious Diseases, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Diana Ir
- Department of Medicine, Division of Infectious Diseases, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Charles E Robertson
- Department of Medicine, Division of Infectious Diseases, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Christopher M Evans
- Department of Medicine, Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Carol M Aherne
- Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado, USA
- School of Medicine, Conway Institute, University College Dublin, Belfield, Dublin, Ireland
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15
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Jensen O, Trivedi S, Meier JD, Leung DT. Defining the role of mucosal-associated invariant T (MAIT) cells in B cell help. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.71.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Pathogen-associated diarrheal diseases account for over 1.6 million deaths annually, yet the number of effective mucosal vaccines remains limited. An exciting potential target for mucosal vaccine adjuvants are mucosal-associated invariant T (MAIT) cells. MAITs are innate-like T cells which are found in the mucosa, blood, and secondary lymphoid organs (SLO), and can respond rapidly to conserved microbial antigens through cytokine secretion and cytotoxic effects. Recent evidence supports a role for MAITs in B cell help. We aim to improve mucosal vaccines by investigating a novel subset of T follicular helper (Tfh)-like MAIT cells and their ability to aid in B cell help and antibody mediated immunity. We describe Tfh-like MAITs from human blood and tonsil samples using linked TCR and phenotype single cell RNAseq, and in vitro culture assays. We further investigate the sufficiency of MAITs aid in antibody mediated immunity in vivo using a MAIT adoptive transfer model into Tcratm1Mom/J (αβ T cell deficient) mice followed by mucosal bacterial challenge. We identify a subset of CXCR5+ MAITs, enriched in human tonsils and murine SLOs that express the Tfh lineage defining transcription factor, BCL6, co-stimulatory markers and cytokines including IL-10 and IL-21 and can aid in B cell help in vitro. Likewise, in vivo we find that MAIT transfer induces pathogen-specific IgA but not IgG responses following mucosal challenge. Overall our study uncovered a novel subset of Tfh-like MAITs and has demonstrated the capacity of MAITs to provide help in antibody responses. Current work aims to uncover the mechanism of MAIT-B cell help which could critically inform efforts to target this population as mucosal adjuvants.
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Affiliation(s)
- Owen Jensen
- 1University of Utah, Department of Pathology
- 2University of Utah, Division of Infectious Disease
| | | | - Jeremy D. Meier
- 3University of Utah, Division of Otolaryngology-Head and Neck Surgery
- 4Primary Children’s Hospital
| | - Daniel T. Leung
- 1University of Utah, Department of Pathology
- 2University of Utah, Division of Infectious Disease
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16
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Diep TT, Jensen O, Van Thuong N, Nhi NTN, Thu NNA, Quang VN, Hieu TC, Thang HA, Thuy ND, Thang HV, Tuyen HT, Ngan LD, Ha NTT, Dung TD, Anderson CP, Azman AS, Leung DT. Sero-evaluation of Immune Responses to Vibrio cholerae in a Postelimination Setting. Open Forum Infect Dis 2020; 7:ofaa136. [PMID: 32462045 PMCID: PMC7240342 DOI: 10.1093/ofid/ofaa136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/17/2020] [Indexed: 11/14/2022] Open
Abstract
Cholera remains a significant public health problem worldwide. In settings of declining incidence, serosurveillance may be used to augment clinical surveillance. We utilized dried blood spot sampling and cholera-specific antibody testing to examine the serologic profiles of vaccinated and unvaccinated children in southern Vietnam, where cholera was recently eliminated.
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Affiliation(s)
| | - Owen Jensen
- Division of Infectious Diseases, University of Utah, Salt Lake City, Utah, USA
| | | | | | | | | | | | | | | | | | | | - Le Dang Ngan
- Provincial Preventive Medical Centres, Tien Giang, Vietnam
| | | | | | - Cole P Anderson
- Division of Infectious Diseases, University of Utah, Salt Lake City, Utah, USA
| | - Andrew S Azman
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Daniel T Leung
- Division of Infectious Diseases, University of Utah, Salt Lake City, Utah, USA.,Division of Microbiology & Immunology, University of Utah, Salt Lake City, Utah, USA
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17
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Zhigalov A, Herring JD, Herpers J, Bergmann TO, Jensen O. Probing cortical excitability using rapid frequency tagging. Neuroimage 2019; 195:59-66. [PMID: 30930309 PMCID: PMC6547046 DOI: 10.1016/j.neuroimage.2019.03.056] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/25/2019] [Accepted: 03/25/2019] [Indexed: 12/25/2022] Open
Abstract
Frequency tagging has been widely used to study the role of visual selective attention. Presenting a visual stimulus flickering at a specific frequency generates so-called steady-state visually evoked responses. However, frequency tagging is mostly done at lower frequencies (<30 Hz). This produces a visible flicker, potentially interfering with both perception and neuronal oscillations in the theta, alpha and beta band. To overcome these problems, we used a newly developed projector with a 1440 Hz refresh rate allowing for frequency tagging at higher frequencies. We asked participants to perform a cued spatial attention task in which imperative pictorial stimuli were presented at 63 Hz or 78 Hz while measuring whole-head magnetoencephalography (MEG). We found posterior sensors to show a strong response at the tagged frequency. Importantly, this response was enhanced by spatial attention. Furthermore, we reproduced the typical modulations of alpha band oscillations, i.e., decrease in the alpha power contralateral to the attentional cue. The decrease in alpha power and increase in frequency tagged signal with attention correlated over subjects. We hereby provide proof-of-principle for the use of high-frequency tagging to study sensory processing and neuronal excitability associated with attention.
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Affiliation(s)
- A Zhigalov
- Centre for Human Brain Health, School of Psychology, University of Birmingham, UK.
| | - J D Herring
- Donders Institute, Radboud University Nijmegen, Nijmegen, the Netherlands
| | - J Herpers
- Laboratory for Neurophysiology and Psychophysiology, KU Leuven, Leuven, Belgium
| | - T O Bergmann
- Donders Institute, Radboud University Nijmegen, Nijmegen, the Netherlands; Department of Neurology and Stroke, and Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany; Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany; Deutsches Resilienz Zentrum (DRZ), Johannes Gutenberg University Medical Center, Mainz, Germany
| | - O Jensen
- Centre for Human Brain Health, School of Psychology, University of Birmingham, UK
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18
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Marzetti L, D'Andrea A, Chella F, Marshall T, Pizzella V, Romani G, Jensen O. The visuospatial attention network recruitment is mediate by alpha and alpha-beta phase synchronization through the Superior Longitudinal Fasciculus. Int J Psychophysiol 2018. [DOI: 10.1016/j.ijpsycho.2018.07.215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Jensen O, Bach EF, Barber B, van Bemmel JH, Bravar D, van Eimeren W, Greinacher C, Lamberts H, PuppincklO C, Puybasset B, Rienhoff O, France FH, Sachot E, Zöllner FK, Santucci G. Rationale for a Community Strategy in the Field of Information and Communications Technologies Applied to Health Care. Methods Inf Med 2018. [DOI: 10.1055/s-0038-1634778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
AbstractThe challenge for Europe in the field of information and communications technologies applied to health care is that of addressing positively the problem of the widening gap between the expectations of the citizens of the type of care that can be made available and the limited resources to provide that care. If the expectations of the population are to be fulfilled, it will be necessary to find innovative ways of delivering health services and to do it more efficiently than has yet been the case. Advanced information and communications technologies will be important tools for Member States to achieve the levels of efficiency required. Based on the results of the Community AIM Exploratory Action, further collaborative work is required at EEC level to create an Integrated Health Information Environment (lHE) allowing essentially for integration, modularity and security.
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Ter Huurne N, Lozano-Soldevilla D, Onnink M, Kan C, Buitelaar J, Jensen O. Diminished modulation of preparatory sensorimotor mu rhythm predicts attention-deficit/hyperactivity disorder severity. Psychol Med 2017; 47:1947-1956. [PMID: 28290271 DOI: 10.1017/s0033291717000332] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Attention-deficit/hyperactivity disorder (ADHD) is characterized by problems in regulating attention and in suppressing disruptive motor activity, i.e. hyperactivity and impulsivity. We recently found evidence that aberrant distribution of posterior α band oscillations (8-12 Hz) is associated with attentional problems in ADHD. The sensorimotor cortex also produces strong 8-12 Hz band oscillations, namely the μ rhythm, and is thought to have a similar inhibitory function. Here, we now investigate whether problems in distributing α band oscillations in ADHD generalize to the μ rhythm in the sensorimotor domain. METHOD In a group of adult ADHD (n = 17) and healthy control subjects (n = 18; aged 21-40 years) oscillatory brain activity was recorded using magnetoencephalography during a visuo-spatial attention task. Subjects had to anticipate a target with unpredictable timing and respond by pressing a button. RESULTS Preparing a motor response, the ADHD group failed to increase hemispheric μ lateralization with relatively higher μ power in sensorimotor regions not engaged in the task, as the controls did (F 1,33 = 8.70, p = 0.006). Moreover, the ADHD group pre-response μ lateralization not only correlated positively with accuracy (r s = 0.64, p = 0.0052) and negatively with intra-individual reaction time variability (r s = -0.52, p = 0.033), but it also correlated negatively with the score on an ADHD rating scale (r s = -0.53, p = 0.028). CONCLUSIONS We suggest that ADHD is associated with an inability to sufficiently inhibit task-irrelevant sensorimotor areas by means of modulating μ oscillatory activity. This could explain disruptive motor activity in ADHD. These results provide further evidence that impaired modulation of α band oscillations is involved in the pathogenesis of ADHD.
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Affiliation(s)
- N Ter Huurne
- Karakter Child and Adolescent Psychiatry University Centre,Nijmegen,The Netherlands
| | - D Lozano-Soldevilla
- Donders Institute for Brain,Cognition and Behaviour,Radboud University,Nijmegen,The Netherlands
| | - M Onnink
- Department of Human Genetics,Radboudumc,Nijmegen,The Netherlands
| | - C Kan
- Department of Psychiatry,Radboudumc,Nijmegen,The Netherlands
| | - J Buitelaar
- Karakter Child and Adolescent Psychiatry University Centre,Nijmegen,The Netherlands
| | - O Jensen
- Centre for Human Brain Health,School of Psychology,University of Birmingham,Birmingham,UK
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Neudecker V, Haneklaus M, Jensen O, Khailova L, Masterson JC, Tye H, Biette K, Jedlicka P, Brodsky KS, Gerich ME, Mack M, Robertson AAB, Cooper MA, Furuta GT, Dinarello CA, O'Neill LA, Eltzschig HK, Masters SL, McNamee EN. Myeloid-derived miR-223 regulates intestinal inflammation via repression of the NLRP3 inflammasome. J Exp Med 2017; 214:1737-1752. [PMID: 28487310 PMCID: PMC5460990 DOI: 10.1084/jem.20160462] [Citation(s) in RCA: 268] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 01/22/2017] [Accepted: 03/28/2017] [Indexed: 12/16/2022] Open
Abstract
Neudecker et al. define a role for a microRNA, miR-223, in regulating the inflammatory tone of the intestine by constraining nlrp3 inflammasome activation in CCR2+ monocytes and attenuating excessive IL-1β–driven inflammation. Therapeutic nanoparticle delivery of miR-223 mimetics limits experimental colitis. MicroRNA (miRNA)-mediated RNA interference regulates many immune processes, but how miRNA circuits orchestrate aberrant intestinal inflammation during inflammatory bowel disease (IBD) is poorly defined. Here, we report that miR-223 limits intestinal inflammation by constraining the nlrp3 inflammasome. miR-223 was increased in intestinal biopsies from patients with active IBD and in preclinical models of intestinal inflammation. miR-223-/y mice presented with exacerbated myeloid-driven experimental colitis with heightened clinical, histopathological, and cytokine readouts. Mechanistically, enhanced NLRP3 inflammasome expression with elevated IL-1β was a predominant feature during the initiation of colitis with miR-223 deficiency. Depletion of CCR2+ inflammatory monocytes and pharmacologic blockade of IL-1β or NLRP3 abrogated this phenotype. Generation of a novel mouse line, with deletion of the miR-223 binding site in the NLRP3 3′ untranslated region, phenocopied the characteristics of miR-223-/y mice. Finally, nanoparticle-mediated overexpression of miR-223 attenuated experimental colitis, NLRP3 levels, and IL-1β release. Collectively, our data reveal a previously unappreciated role for miR-223 in regulating the innate immune response during intestinal inflammation.
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Affiliation(s)
- Viola Neudecker
- Clinic for Anesthesiology, University Hospital of Ludwig-Maximilians-University, 80539 Munich, Germany.,Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Moritz Haneklaus
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Owen Jensen
- Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045.,Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Ludmila Khailova
- Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Joanne C Masterson
- Gastrointestinal Eosinophilic Disease Program, Section of Pediatric Gastroenterology, Hepatology, and Nutrition, Children's Hospital Colorado, Aurora, CO 80045.,Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Hazel Tye
- Division of Inflammation, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Kathryn Biette
- Gastrointestinal Eosinophilic Disease Program, Section of Pediatric Gastroenterology, Hepatology, and Nutrition, Children's Hospital Colorado, Aurora, CO 80045.,Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Paul Jedlicka
- Department of Pathology, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Kelley S Brodsky
- Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Mark E Gerich
- Division of Gastroenterology and Hepatology, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045.,Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Matthias Mack
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Avril A B Robertson
- Institute for Molecular Bioscience, The University of Queensland, Brisbane City, QLD 4067, Australia
| | - Matthew A Cooper
- Institute for Molecular Bioscience, The University of Queensland, Brisbane City, QLD 4067, Australia
| | - Glenn T Furuta
- Gastrointestinal Eosinophilic Disease Program, Section of Pediatric Gastroenterology, Hepatology, and Nutrition, Children's Hospital Colorado, Aurora, CO 80045.,Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Charles A Dinarello
- Department of Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands.,Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Luke A O'Neill
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Holger K Eltzschig
- Department of Anesthesiology, University of Texas Medical School at Houston, Houston, TX 77030.,Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
| | - Seth L Masters
- Division of Inflammation, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Eóin N McNamee
- Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045 .,Department of Anesthesiology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045
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Herring J, Esterer S, Marshall T, Jensen O, Bergmann T. P189 Transcranial modulation of visually induced gamma power: a concurrent TACS-MEG study. Clin Neurophysiol 2017. [DOI: 10.1016/j.clinph.2016.10.309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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23
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Tomasetti B, Ewers R, Jensen O. Short, ultrashort and narrow implants versus augmentation and grafting with traditional length implants. Int J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.ijom.2017.02.362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Poggio TV, Jensen O, Mossello M, Iriarte J, Avila HG, Gertiser ML, Serafino JJ, Romero S, Echenique MA, Dominguez DE, Barrios JR, Heath D. Serology and longevity of immunity against Echinococcus granulosus in sheep and llama induced by an oil-based EG95 vaccine. Parasite Immunol 2016; 38:496-502. [PMID: 27104482 DOI: 10.1111/pim.12325] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 04/18/2016] [Indexed: 11/30/2022]
Abstract
An oil-based formulation of the EG95 vaccine to protect grazing animals against infection with Echinococcus granulosus was formulated in Argentina. The efficacy of the vaccine was monitored by serology in sheep and llama (Lama glama) and was compared to the serology in sheep previously published using a QuilA-adjuvanted vaccine. Long-term efficacy was also tested in sheep by challenging with E. granulosus eggs of the G1 strain 4 years after the beginning of the trial. The serological results for both sheep and llama were similar to those described previously, except that there was a more rapid response after the first vaccination. A third vaccination given after 1 year resulted in a transient boost in serology that lasted for about 12 months, which was similar to results previously described. Sheep challenged after 4 years with three vaccinations presented 84·2% reduction of live cysts counts compared with control group, and after a fourth vaccination prior to challenge, this reduction was 94·7%. The oil-based vaccine appeared to be bio-equivalent to the QuilA vaccine.
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Affiliation(s)
- T V Poggio
- Centro de Virologia Animal, Instituto de Ciencia y Tecnología "Dr. Cesar Milstein" - CONICET, Buenos Aires, Argentina
| | - O Jensen
- Centro de Investigación en Zoonosis, Chubut, Argentina
| | - M Mossello
- Departamento Zooantroponosis, Ministerio de Salud, Chubut, Argentina
| | - J Iriarte
- Departamento Zooantroponosis, Ministerio de Salud, Chubut, Argentina
| | - H G Avila
- Facultad de Medicina, Instituto de Investigaciones en Microbiología y Parasitología Médica, Universidad de Buenos Aires (IMPAM-CONICET-UBA), Buenos Aires, Argentina
| | - M L Gertiser
- Centro de Investigación en Zoonosis, Chubut, Argentina
| | - J J Serafino
- Centro de Virologia Animal, Instituto de Ciencia y Tecnología "Dr. Cesar Milstein" - CONICET, Buenos Aires, Argentina
| | - S Romero
- Estación Experimental Agropecuaria, INTA, Abra Pampa, Jujuy, Argentina
| | - M A Echenique
- Estación Experimental Agropecuaria, INTA, Abra Pampa, Jujuy, Argentina
| | - D E Dominguez
- Dirección de Sanidad Animal, Subsecretaría de Ganadería y Agricultura, Ministerio de Desarrollo Territorial y Sectores Productivos, Chubut, Argentina
| | - J R Barrios
- Oficina Local Puerto Madryn, Dirección de Sanidad Animal, Servicio Nacional de Sanidad Animal (SENASA), Argentina
| | - D Heath
- AgResearch Ltd., Palmerston North, New Zealand
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Freire MG, Schweigmann NJ, Svagelj WS, Loetti MV, Jensen O, Burroni NE. Relationship between environmental conditions and host-seeking activity of Ochlerotatus albifasciatus (Diptera: Culicidae) in an agroecosystem and in an urban area in Chubut, Central Patagonia, Argentina. J NAT HIST 2016. [DOI: 10.1080/00222933.2016.1145271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- M. G. Freire
- Grupo de Estudio de Mosquitos, Departamento de Ecología, Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - N. J. Schweigmann
- Grupo de Estudio de Mosquitos, Departamento de Ecología, Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - W. S. Svagelj
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
- Instituto de Investigaciones Marinas y Costeras (CONICET-UNMdP), Universidad Nacional de Mar del Plata, Mar del Plata, Buenos Aires, Argentina
| | - M. V Loetti
- Grupo de Estudio de Mosquitos, Departamento de Ecología, Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - O. Jensen
- Departamento de Zooartroponosis, Ministerio de Salud, Provincia de Chubut, Argentina
| | - N. E. Burroni
- Grupo de Estudio de Mosquitos, Departamento de Ecología, Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
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van de Nieuwenhuijzen ME, Axmacher N, Fell J, Oehrn CR, Jensen O, van Gerven MAJ. Decoding of task-relevant and task-irrelevant intracranial EEG representations. Neuroimage 2016; 137:132-139. [PMID: 27153977 DOI: 10.1016/j.neuroimage.2016.05.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/31/2016] [Accepted: 05/02/2016] [Indexed: 11/27/2022] Open
Abstract
Natural stimuli consist of multiple properties. However, not all of these properties are equally relevant in a given situation. In this study, we applied multivariate classification algorithms to intracranial electroencephalography data of human epilepsy patients performing an auditory Stroop task. This allowed us to identify neuronal representations of task-relevant and irrelevant pitch and semantic information of spoken words in a subset of patients. When properties were relevant, representations could be detected after about 350ms after stimulus onset. When irrelevant, the association with gamma power differed for these properties. Patients with more reliable representations of irrelevant pitch showed increased gamma band activity (35-64Hz), suggesting that attentional resources allow an increase in gamma power in some but not all patients. This effect was not observed for irrelevant semantics, possibly because the more automatic processing of this property allowed for less variation in free resources. Processing of different properties of the same stimulus seems therefore to be dependent on the characteristics of the property.
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Affiliation(s)
- M E van de Nieuwenhuijzen
- Radboud University, Donders Institute for Brain, Cognition and Behaviour, 6500 HE, Nijmegen, The Netherlands.
| | - N Axmacher
- Department of Neuropsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr University Bochum, D-44801 Bochum, Germany; German Center for Neurodegenerative Diseases, D-53175 Bonn, Germany
| | - J Fell
- Department of Epileptology, University of Bonn, D-53105 Bonn, Germany
| | - C R Oehrn
- Department of Epileptology, University of Bonn, D-53105 Bonn, Germany
| | - O Jensen
- Radboud University, Donders Institute for Brain, Cognition and Behaviour, 6500 HE, Nijmegen, The Netherlands
| | - M A J van Gerven
- Radboud University, Donders Institute for Brain, Cognition and Behaviour, 6500 HE, Nijmegen, The Netherlands
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27
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Fimlaid KA, Jensen O, Donnelly ML, Siegrist MS, Shen A. Regulation of Clostridium difficile Spore Formation by the SpoIIQ and SpoIIIA Proteins. PLoS Genet 2015; 11:e1005562. [PMID: 26465937 PMCID: PMC4605598 DOI: 10.1371/journal.pgen.1005562] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 09/10/2015] [Indexed: 01/05/2023] Open
Abstract
Sporulation is an ancient developmental process that involves the formation of a highly resistant endospore within a larger mother cell. In the model organism Bacillus subtilis, sporulation-specific sigma factors activate compartment-specific transcriptional programs that drive spore morphogenesis. σG activity in the forespore depends on the formation of a secretion complex, known as the “feeding tube,” that bridges the mother cell and forespore and maintains forespore integrity. Even though these channel components are conserved in all spore formers, recent studies in the major nosocomial pathogen Clostridium difficile suggested that these components are dispensable for σG activity. In this study, we investigated the requirements of the SpoIIQ and SpoIIIA proteins during C. difficile sporulation. C. difficile spoIIQ, spoIIIA, and spoIIIAH mutants exhibited defects in engulfment, tethering of coat to the forespore, and heat-resistant spore formation, even though they activate σG at wildtype levels. Although the spoIIQ, spoIIIA, and spoIIIAH mutants were defective in engulfment, metabolic labeling studies revealed that they nevertheless actively transformed the peptidoglycan at the leading edge of engulfment. In vitro pull-down assays further demonstrated that C. difficile SpoIIQ directly interacts with SpoIIIAH. Interestingly, mutation of the conserved Walker A ATP binding motif, but not the Walker B ATP hydrolysis motif, disrupted SpoIIIAA function during C. difficile spore formation. This finding contrasts with B. subtilis, which requires both Walker A and B motifs for SpoIIIAA function. Taken together, our findings suggest that inhibiting SpoIIQ, SpoIIIAA, or SpoIIIAH function could prevent the formation of infectious C. difficile spores and thus disease transmission. The bacterial spore-forming pathogen Clostridium difficile is a leading cause of nosocomial infections in the United States and represents a significant threat to healthcare systems around the world. As an obligate anaerobe, C. difficile must form spores in order to survive exit from the gastrointestinal tract. Accordingly, spore formation is essential for C. difficile disease transmission. Since the mechanisms controlling this process remain poorly characterized, we analyzed the importance of highly conserved secretion channel components during C. difficile sporulation. In the model organism Bacillus subtilis, this channel had previously been shown to function as a “feeding tube” that allows the mother cell to nurture the developing forespore and sustain transcription in the forespore. We show here that conserved components of this structure in C. difficile are dispensable for forespore transcription, although they are important for completing forespore engulfment and retaining the protective spore coat around the forespore, in contrast with B. subtilis. The results of our study suggest that targeting these conserved proteins could prevent C. difficile spore formation and thus disease transmission.
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Affiliation(s)
- Kelly A. Fimlaid
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
- Program in Cellular, Molecular & Biomedical Sciences, University of Vermont, Burlington, Vermont, United States of America
| | - Owen Jensen
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
| | - M. Lauren Donnelly
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
| | - M. Sloan Siegrist
- Department of Microbiology, University of Massachusetts Amherst, Amherst, Massachusetts, United States of America
| | - Aimee Shen
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
- * E-mail:
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Fimlaid KA, Jensen O, Donnelly ML, Francis MB, Sorg JA, Shen A. Identification of a Novel Lipoprotein Regulator of Clostridium difficile Spore Germination. PLoS Pathog 2015; 11:e1005239. [PMID: 26496694 PMCID: PMC4619724 DOI: 10.1371/journal.ppat.1005239] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 09/29/2015] [Indexed: 12/18/2022] Open
Abstract
Clostridium difficile is a Gram-positive spore-forming pathogen and a leading cause of nosocomial diarrhea. C. difficile infections are transmitted when ingested spores germinate in the gastrointestinal tract and transform into vegetative cells. Germination begins when the germinant receptor CspC detects bile salts in the gut. CspC is a subtilisin-like serine pseudoprotease that activates the related CspB serine protease through an unknown mechanism. Activated CspB cleaves the pro-SleC zymogen, which allows the activated SleC cortex hydrolase to degrade the protective cortex layer. While these regulators are essential for C. difficile spores to outgrow and form toxin-secreting vegetative cells, the mechanisms controlling their function have only been partially characterized. In this study, we identify the lipoprotein GerS as a novel regulator of C. difficile spore germination using targeted mutagenesis. A gerS mutant has a severe germination defect and fails to degrade cortex even though it processes SleC at wildtype levels. Using complementation analyses, we demonstrate that GerS secretion, but not lipidation, is necessary for GerS to activate SleC. Importantly, loss of GerS attenuates the virulence of C. difficile in a hamster model of infection. Since GerS appears to be conserved exclusively in related Peptostreptococcaeace family members, our results contribute to a growing body of work indicating that C. difficile has evolved distinct mechanisms for controlling the exit from dormancy relative to B. subtilis and other spore-forming organisms.
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Affiliation(s)
- Kelly A. Fimlaid
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
- Program in Cellular, Molecular & Biomedical Sciences, University of Vermont, Burlington, Vermont, United States of America
| | - Owen Jensen
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
| | - M. Lauren Donnelly
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
| | - Michael B. Francis
- Department of Biology, Texas A&M University, College Station, Texas, United States of America
| | - Joseph A. Sorg
- Department of Biology, Texas A&M University, College Station, Texas, United States of America
| | - Aimee Shen
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
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Garzón MJ, Jensen O, Schweigmann N. Environmental factors related to the abundance and activity of Ochlerotatus albifasciatus (Diptera: Culicidae) in an agricultural landscape of steppe arid climate. J Med Entomol 2014; 51:733-741. [PMID: 25118404 DOI: 10.1603/me14016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ochlerotatus albifasciatus (Macquart) is a flood water mosquito whose highest density has been found associated both with natural landscapes (prairies or grazing fields) in temperate and subtropical regions and with rainfall events. In the current study, we aimed to find out how the marked differences between environmental factors of agricultural landscape patches in a steppe arid region affect the relative abundance of this species. In wetland patches, the high activity of adults was closely associated with the flood irrigation system, suggesting that the agricultural activity contributes to the proliferation of this mosquito. The steppe patches would constitute an adverse environment reflected by the abrupt decrease in abundance. Multiple linear regression showed that some explanatory variables, such as wetland patches and moment of the day (midday), did not contribute significantly to the relative abundance variation. In contrast, temperature, wind, and cloud cover seemed to regulate the biting activity of females. Temperature affected the activity of mosquitoes in the steppe but seemed to have no effect in wetland patches, where the activity of mosquitoes was permanent and more stable against changes in temperature. In the steppe, which presents low levels of humidity, scarce vegetation, and greater wind exposure, the activity seemed to be unstable against small thermal variations. The variability of the relative abundance of Oc. albifasciatus in an agricultural landscape was widely explained by temperature in combination with the microenvironment type, wind speed, and cloud cover and indirectly by human activity.
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Garzón MJ, Jensen O, Schweigmann N. Resistance to freezing temperatures in Aedes (Ochlerotatus) albifasciatus (Macquart) eggs (Diptera: Culicidae) from two different climatic regions of Argentina. J Vector Ecol 2013; 38:339-344. [PMID: 24581364 DOI: 10.1111/j.1948-7134.2013.12049.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 06/12/2013] [Indexed: 06/03/2023]
Abstract
Aedes (Ochlerotatus) albifasciatus (Macquart) has the capacity to proliferate in different kinds of climates within its distribution range in South America. With the aim of studying local thermal adaptations of eggs, we exposed egg stocks from two climatically different localities: temperate humid pampa (Buenos Aires) and cold arid Patagonian (Sarmiento), to freezing conditions and then evaluated the effect on some features at this level. First, we thermally described the substrate where this species lays its eggs in the arid region. A typical thermal condition during winter was 10 h at -12° C. Second, we evaluated the effect of freezing on primary hatching (vs total hatching) and embryo survival. We also compared the proportion of embryonated eggs from both populations. The proportions of embryonated eggs were not different between localities, with averages of 78% and 83% in Sarmiento and Buenos Aires, respectively. Survival was equally successful after freezing in the two localities with an average range between 94-99%. Whether or not the eggs from Buenos Aires and Sarmiento were under freezing conditions, hatching was more than 98% after the first flooding. The results suggest that eggs of Ae. albifasciatus from Sarmiento and Buenos Aires have the same ability to survive at extreme temperatures (<0° C), showing a regional thermal adaptation rather than a local one.
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Affiliation(s)
- M J Garzón
- Grupo de Estudio de Mosquitos, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Autónoma de Buenos Aires, Argentina; CONICET, Departamento de Investigación en Salud, Secretaria de Salud, Chubut, Argentina.
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Herring J, Thut G, Jensen O, Bergmann T. P 49. Modulation of spontaneous and TMS-evoked alpha oscillations by top-down visual attention. Clin Neurophysiol 2013. [DOI: 10.1016/j.clinph.2013.04.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jensen O, Gabre P, Sköld UM, Birkhed D, Povlsen L. ‘I take for granted that patients know’ - oral health professionals' strategies, considerations and methods when teaching patients how to use fluoride toothpaste. Int J Dent Hyg 2013; 12:81-8. [DOI: 10.1111/idh.12041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2013] [Indexed: 11/29/2022]
Affiliation(s)
- O Jensen
- Public Dental Service; Västra Götaland Region; Stenungsund Sweden
- Department of Cariology; Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - P Gabre
- Department of Cariology; Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
- Department of Preventive Dentistry; Public Dental Health; Uppsala County Council; Uppsala Sweden
| | - UM Sköld
- Department of Cariology; Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - D Birkhed
- Department of Cariology; Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - L Povlsen
- Nordic School of Public Health NHV; Gothenburg Sweden
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Fournier R, Gussenhoven C, Jensen O, Hagoort P. Lateralization of tonal and intonational pitch processing: An MEG study. Brain Res 2010; 1328:79-88. [DOI: 10.1016/j.brainres.2010.02.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 02/08/2010] [Accepted: 02/18/2010] [Indexed: 10/19/2022]
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Nieuwenhuis IL, Takashima A, Oostenveld R, Fernández G, Jensen O. Memory consolidation increases the involvement of and the connectivity between neocortical memory areas; an MEG study. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70499-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Mazaheri A, Nieuwenhuis I, van Dijk H, Jensen O. A Top-down drive Modulates Oscillatory Brain States Predictive of Motor Performance. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71974-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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36
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de Lange FP, Jensen O, Oostenveld R, Dehaene S. Tracking decision-related activity in the human brain using MEG. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70680-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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37
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Mazaheri A, van Dijk H, van der Werf J, Medendorp P, Jensen O. Slow Event-related fields can be created from Modulations in Oscillatory Brain activity. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70034-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Talamini LM, Nieuwenhuis IL, Takashima A, Jensen O. Sleep directly following learning benefits consolidation of spatial associative memory. Learn Mem 2008; 15:233-7. [PMID: 18391183 DOI: 10.1101/lm.771608] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Estevao Belchior S, Gallardo A, Abalos A, Díaz Y, Alvarez L, Callejo R, Prieto M, Jodor N, Jensen O. [Diagnosis of caseous lymphadenitis in sheep from Patagonia]. Rev Argent Microbiol 2007; 39:44-6. [PMID: 17593581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Abstract
Caseous lymphadenitis (CLA) is a chronic bacterial, infectious and contagious disease caused by Corynebacterium pseudotuberculosis. It affects sheep and results in abscesses of the lymph nodes in subcutaneous tissue, as well as in internal organs such as lungs, liver and kidneys. Differential diagnosis of the disease is based on the isolation and biochemical identification of the etiological agent. The purpose of this study was to characterize the bacteria isolated from typical CLA lesions in sheep from Patagonia, Argentina, at metabolic and genetic levels. Macroscopic observations show a fibrous membrane containing caseous necrotic tissue. Histopathological analysis shows an eosinophilic necrotic area surrounded by epitheloid cells and polymorphonuclear infiltration. Other analyses performed such as microscopic observations, in vitro culture, biochemical tests and 16s rDNA sequencing confirmed diagnosis of caseous lymphadenitis due to C. pseudotuberculosis.
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Affiliation(s)
- S Estevao Belchior
- Universidad Nacional de la Patagonia San Juan Bosco, Ciudad Universitaria Km 4 (9000) Comodoro Rivadavia, Chubut, Argentina.
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Abstract
Experimental work based on single cell recordings supports the hypothesis that working memory representations are retained by sustained neuronal firing. While this hypothesis can account for the maintenance of a single memory item, it remains unclear how multiple working memory items are represented. This account will discuss the possible physiological mechanism responsible for the maintenance of multiple working memory items including mechanisms based on sustained firing and synaptic encoding. The focus will be on temporal segmentation by phase encoding, namely the idea that several working memory items are activated sequentially at different points in time. It has been proposed that a mechanism of nested gamma (30-80 Hz) and theta (4-8 Hz) oscillations is responsible for controlling the reactivation of the memory list. This mechanism has been shown to be compatible with multiple behavioral findings on working memory such as the data from the Sternberg experiment. The theta/gamma mechanism has also received support from a large set of electrophysiological findings, however, more experimental work is required to further substantiate or falsify the model.
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Affiliation(s)
- O Jensen
- Radboud University Nijmegen, F. C. Donders Centre for Cognitive Neuroimaging, Kapitelweg 29, 6525 EN Nijmegen, The Netherlands.
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Takashima A, Petersson KM, Rutters F, Tendolkar I, Jensen O, Zwarts MJ, McNaughton BL, Fernández G. Declarative memory consolidation in humans: a prospective functional magnetic resonance imaging study. Proc Natl Acad Sci U S A 2006; 103:756-61. [PMID: 16407110 PMCID: PMC1334654 DOI: 10.1073/pnas.0507774103] [Citation(s) in RCA: 363] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2005] [Indexed: 11/18/2022] Open
Abstract
Retrieval of recently acquired declarative memories depends on the hippocampus, but with time, retrieval is increasingly sustainable by neocortical representations alone. This process has been conceptualized as system-level consolidation. Using functional magnetic resonance imaging, we assessed over the course of three months how consolidation affects the neural correlates of memory retrieval. The duration of slow-wave sleep during a nap/rest period after the initial study session and before the first scan session on day 1 correlated positively with recognition memory performance for items studied before the nap and negatively with hippocampal activity associated with correct confident recognition. Over the course of the entire study, hippocampal activity for correct confident recognition continued to decrease, whereas activity in a ventral medial prefrontal region increased. These findings, together with data obtained in rodents, may prompt a revision of classical consolidation theory, incorporating a transfer of putative linking nodes from hippocampal to prelimbic prefrontal areas.
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Affiliation(s)
- A Takashima
- F. C. Donders Center, Radboud University Nijmegen, P.O. Box 9101, 6500HB, Nijmegen, The Netherlands.
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Siklosi M, Tew R, Jensen O. Multiscale models for the acoustic properties of lung parenchyma. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85488-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Takashima A, Jensen O, Oostenveld R, Maris E, van de Coevering M, Fernández G. Successful declarative memory formation is associated with ongoing activity during encoding in a distributed neocortical network related to working memory: a magnetoencephalography study. Neuroscience 2005; 139:291-7. [PMID: 16325347 DOI: 10.1016/j.neuroscience.2005.05.067] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2005] [Revised: 04/29/2005] [Accepted: 05/06/2005] [Indexed: 10/25/2022]
Abstract
The aim of the present study was to investigate the spatio-temporal characteristics of the neural correlates of declarative memory formation as assessed by the subsequent memory effect, i.e. the difference in encoding activity between subsequently remembered and subsequently forgotten items. Different operations could account for these effects. In particular, it has been proposed that successful memory formation depends on the organization of the information at the time of encoding, an operation accomplished by the working memory system. Consequently, functional magnetic resonance imaging studies have already shown that the very same regions that are involved in certain working memory processes are also involved in declarative memory formation. Here, we used magnetoencephalography to investigate whether the subsequent memory effects in these regions are present throughout picture stimulus presentation, postulating ongoing working memory operations as an effective factor. The results showed that subsequent memory effects began to appear after about 300 ms post stimulus onset over bilateral temporal areas and left parietal regions and were sustained throughout the recording epoch (1000 ms). Roughly parallel to these effects, we identified a left frontal subsequent memory effect, which, however, was less sustained than the other effects. In addition, we revealed a late subsequent memory effect over the right occipital region, which has not been described previously in the event-related potential literature. These sustained subsequent memory effects are suggestive of working memory processes that may enable deep semantic and perceptual processing. Additionally, contextually constrained visual perception after top-down modulation may account for a more efficient encoding of the complex scene.
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Affiliation(s)
- A Takashima
- F. C. Donders Center for Cognitive Neuroimaging, Radboud University Nijmegen, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
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Jensen O, Goel P, Kopell N, Pohja M, Hari R, Ermentrout B. On the human sensorimotor-cortex beta rhythm: sources and modeling. Neuroimage 2005; 26:347-55. [PMID: 15907295 DOI: 10.1016/j.neuroimage.2005.02.008] [Citation(s) in RCA: 289] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2004] [Revised: 01/24/2005] [Accepted: 02/09/2005] [Indexed: 11/26/2022] Open
Abstract
Cortical oscillations in the beta band (13-35 Hz) are known to be modulated by the GABAergic agonist benzodiazepine. To investigate the mechanisms generating the approximately 20-Hz oscillations in the human cortex, we administered benzodiazepines to healthy adults and monitored cortical oscillatory activity by means of magnetoencephalography. Benzodiazepine increased the power and decreased the frequency of beta oscillations over rolandic areas. Minimum current estimates indicated the effect to take place around the hand area of the primary sensorimotor cortex. Given that previous research has identified sources of the beta rhythm in the motor cortex, our results suggest that these same motor-cortex beta sources are modulated by benzodiazepine. To explore the mechanisms underlying the increase in beta power with GABAergic inhibition, we simulated a conductance-based neuronal network comprising excitatory and inhibitory neurons. The model accounts for the increase in the beta power, the widening of the spectral peak, and the slowing down of the rhythms with benzodiazepines, implemented as an increase in GABAergic conductance. We found that an increase in IPSCs onto inhibitory neurons was more important for generating neuronal synchronization in the beta band than an increase in IPSCs onto excitatory pyramidal cells.
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Affiliation(s)
- O Jensen
- Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Finland.
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Liljeström M, Kujala J, Jensen O, Salmelin R. Neuromagnetic localization of rhythmic activity in the human brain: a comparison of three methods. Neuroimage 2005; 25:734-45. [PMID: 15808975 DOI: 10.1016/j.neuroimage.2004.11.034] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2004] [Revised: 10/04/2004] [Accepted: 11/29/2004] [Indexed: 11/17/2022] Open
Abstract
Cortical rhythmic activity is increasingly employed for characterizing human brain function. Using MEG, it is possible to localize the generators of these rhythms. Traditionally, the source locations have been estimated using sequential dipole modeling. Recently, two new methods for localizing rhythmic activity have been developed, Dynamic Imaging of Coherent Sources (DICS) and Frequency-Domain Minimum Current Estimation (MCE(FD)). With new analysis methods emerging, the researcher faces the problem of choosing an appropriate strategy. The aim of this study was to compare the performance and reliability of these three methods. The evaluation was performed using measured data from four healthy subjects, as well as with simulations of rhythmic activity. We found that the methods gave comparable results, and that all three approaches localized the principal sources of oscillatory activity very well. Dipole modeling is a very powerful tool once appropriate subsets of sensors have been selected. MCE(FD) provides simultaneous localization of sources and was found to give a good overview of the data. With DICS, it was possible to separate close-by sources that were not retrieved by the other two methods.
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Affiliation(s)
- M Liljeström
- Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, Fin-02015 HUT, Espoo, Finland.
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Sánchez Thevenet P, Jensen O, Mellado I, Torrecillas C, Raso S, Flores ME, Minvielle MC, Basualdo JA. Presence and persistence of intestinal parasites in canine fecal material collected from the environment in the Province of Chubut, Argentine Patagonia. Vet Parasitol 2003; 117:263-9. [PMID: 14637028 DOI: 10.1016/j.vetpar.2003.09.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We investigated the presence of intestinal parasites in canine feces collected from public squares in Comodoro Rivadavia, Chubut, Argentina (45 degrees S, 68 degrees W) and determined the persistence of Echinococcus granulosus eggs in those droppings under natural environmental conditions in that region. In the first experiment, we analyzed 163 fecal samples collected from urban squares during 8 months time and found parasitic elements in 46.6%. The presence of parasites was independent of the condition of the feces (fresh or dried; P>0.05). Parasites potentially pathogenic in man were present, such as Toxocara species (spp.), Taenia spp./Echinococcus spp., Uncinarias spp., and Entamoeba spp. In the second experiment, we analyzed two canine fecal samples contaminated with E. granulosus eggs, deposited for 41 months within the natural environment. These parasitic elements persisted during the entire study as attested by light microscopy and the ELISA coproantigen test. We propose the study of the presence of intestinal parasites in canine feces within the environment as a general strategy for identifying and monitoring areas of risk for canine-related zoonoses since we were able to demonstrate the persistence of E. granulosus eggs in deposited canine feces for over 3 years within the area studied.
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Affiliation(s)
- P Sánchez Thevenet
- Departamento de Bioquímica, Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia, San Juan Bosco, Comodoro Rivadavia, 9000 Chubut, Argentina.
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Tanner B, Beerheide W, Jensen O, von Mach M, Ringel M, Fleckenstein C, Schumann S, Renzing N, Hildebrand A, Neubert S, Glawatz C, Hengstler J. Isolierung und Transplantation mesenchymaler Stammzellen aus Nabelschnurblut. Geburtshilfe Frauenheilkd 2003. [DOI: 10.1055/s-2003-42734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Heath DD, Jensen O, Lightowlers MW. Progress in control of hydatidosis using vaccination--a review of formulation and delivery of the vaccine and recommendations for practical use in control programmes. Acta Trop 2003; 85:133-43. [PMID: 12606090 DOI: 10.1016/s0001-706x(02)00219-x] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A vaccine to protect sheep, goats, and bovines against hydatid disease caused by the cysts of Echinococcus granulosus is prepared as a recombinant fusion protein expressed in Escherichia coli. Solubilised inclusion bodies are injected, together with Quil A, subcutaneously on two occasions 1 month or more apart, and induce protection against infection which lasts for at least 12 months. A third injection given 6-12 months after the second injection induces a high and long-lasting protection against artificial or natural challenge infections. This review describes work carried out on the formulation, safety and efficacy of the vaccine under laboratory and field conditions, using artificial or natural challenges with E. granulosus eggs, followed by necropsy. Hydatid control programmes based on regular treatment of all dogs with the correct dose of a highly-efficient anthelmintic have sometimes not been successful in Continental environments. Access to dogs is difficult in summer because of the distances to summer pastures, and is often impossible in winter because of snow. A control program using strategic twice-yearly anthelmintic treatment of dogs is likely to be successful provided grazing animals are vaccinated as well. Vaccination as a control tool only requires the veterinarians to visit two times a year, and while the veterinarian is present, the dogs can be treated with anthelmintic for little additional cost. One visit should take place after the autumn kill of animals for winter consumption, and this is a good time to vaccinate animals born in the summer, and also all other animals while they are healthy and immunologically responsive. The other visit should take place in the spring, at which time animals born during winter can be vaccinated. Although a single immunization has been shown to induce a useful degree of protection, where possible it is best to give two initial injections, 1 month apart. If it is possible for veterinarians to stay in the field for 2 months in November/December and March/April, in order to give the two injections, a more rapid onset of full protective immunity will initially be achieved than if the injections are given 6 months apart. A large-scale safety and efficacy trial involving 50,000 and 100,000 lambs in Qinghai and Xinjiang Provinces of China has taken place. Results have confirmed safety and efficacy. In most countries, prevalence of infection increases with age. The vaccine has no effect on established cysts, and therefore, in order to prevent the biomass of Echinococcus spp. from increasing, it might be an effective strategy to begin a control programme by vaccinating all animals. Because many of the older stock will already be infected, they will remain a source of infection for dogs for the average lifetime of the stock. Dogs will still be able to be infected from the older stock, and will continue to infect humans. We advocate that a vaccination programme be accompanied by education about hydatid disease, and anthelmintic treatment of dogs in late autumn and early spring.
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Affiliation(s)
- D D Heath
- AgResearch, Wallaceville Animal Research Centre, PO Box 40063, Upper Hutt, New Zealand.
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Beerheide W, von Mach MA, Ringel M, Fleckenstein C, Schumann S, Renzing N, Hildebrandt A, Brenner W, Jensen O, Gebhard S, Reifenberg K, Bender J, Oesch F, Hengstler JG. Downregulation of beta2-microglobulin in human cord blood somatic stem cells after transplantation into livers of SCID-mice: an escape mechanism of stem cells? Biochem Biophys Res Commun 2002; 294:1052-63. [PMID: 12074584 DOI: 10.1016/s0006-291x(02)00596-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Adherently growing, non-hematopoietic somatic stem cells isolated from human cord blood were stained with the fluorescent dye PKH26 and transplanted into livers of SCID-mice to examine a possible cell fate transition. Already 7 days after transplantation stem cells were well integrated into the liver tissue. Human albumin that was not expressed by the stem cells before transplantation was detectable in the host's livers after injection of cord blood stem cells. Human alpha1-antitrypsin was detectable in stem cells already before transplantation and remained positive in the mouse liver. The most interesting observation in this study was the downregulation of human beta2-microglobulin (beta2M) in the stem cells after transplantation: beta2M is expressed constitutively in our cord blood stem cells. However, beta2M was no longer detectable by RT-PCR in all tissues where human albumin and alpha1-antitrypsin were expressed after stem cell transplantation. beta2M is known to participate as an integral part of the major histocompatibility complex. Absence of beta2M makes the residual heavy chain inactive as an antigen. Thus, downregulation of beta2M may represent an escape mechanism from killer-T cells and may be a molecular mechanism explaining the recently described "immunological blindness" [37] of stem cells. In contrast to the results obtained after direct injection of stem cells as a suspension, no consistent downregulation of beta2M was observed after transplantation of stem cells encapsulated in alginate beads to generate a compartment where stem cells are protected from the host's natural killer cells. No expression of human genes was observed after transplantation of human cord blood derived mononuclear cells (MNC) that were used as a negative control. In conclusion, we have shown that human cord blood somatic stem cells survive and are reprogrammed after transplantation into mouse livers, although a complete transdifferentiation to hepatocytes did not occur within 7 days, since some marker genes (GATA4 and alpha-fetoprotein) were still negative. Switching off expression of beta2M may be part of an intriguing and novel mechanism explaining why stem cells escape the host's immune system.
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Affiliation(s)
- W Beerheide
- Kourion Therapeutics, Himmelgeister Str. 248, 40225 Düsseldorf, Germany.
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Abstract
There are numerous reports on rhythmic coupling between separate brain networks. It has been proposed that this rhythmic coupling indicates exchange of information. So far, few computational models have been proposed that explore this principle and its potential computational benefits. Recent results on hippocampal place cells of the rat provide new insight; it has been shown that information about space is encoded by the firing of place cells with respect to the phase of the ongoing theta rhythm. This principle is termed phase coding and suggests that upcoming locations (predicted by the hippocampus) are encoded by cells firing late in the theta cycle, whereas current location is encoded by early firing in the theta cycle. A network reading the hippocampal output must inevitably also receive an oscillatory theta input in order to decipher the phase-coded firing patterns. In this article, I propose a simple physiologically plausible mechanism implemented as an oscillatory network that can decode the hippocampal output. By changing only the phase of the theta input to the decoder, qualitatively different information is transferred: the theta phase determines whether representations of current or upcoming locations are read by the decoder. The proposed mechanism provides a computational principle for information transfer between oscillatory networks and might generalize to brain networks beyond the hippocampal region.
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Affiliation(s)
- O Jensen
- Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 Espoo, Finland.
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