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Wu Y, Zhang P, Shi T, Cao D, Pan W. Deficiency of immunoglobulin IgSF6 enhances antibacterial effects by promoting endoplasmic reticulum stress and the inflammatory response in intestinal macrophages. Mucosal Immunol 2024; 17:288-302. [PMID: 38387824 DOI: 10.1016/j.mucimm.2024.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 01/19/2024] [Accepted: 02/14/2024] [Indexed: 02/24/2024]
Abstract
Immunoglobulin superfamily (IgSF) members are known for their role as glycoproteins expressed on the surface of immune cells, enabling protein-protein interactions to sense external signals during immune responses. However, the functions of immunoglobulins localized within subcellular compartments have been less explored. In this study, we identified an endoplasmic reticulum (ER)-localized immunoglobulin, IgSF member 6 (IgSF6), that regulates ER stress and the inflammatory response in intestinal macrophages. Igsf6 expression is sustained by microbiota and significantly upregulated upon bacterial infection. Mice lacking Igsf6 displayed resistance to Salmonella typhimurium challenge but increased susceptibility to dextran sulfate sodium-induced colitis. Mechanistically, deficiency of Igsf6 enhanced inositol-requiring enzyme 1α/-X-box binding protein 1 pathway, inflammatory response, and reactive oxygen species production leading to increased bactericidal activity of intestinal macrophages. Inhibition of reactive oxygen species or inositol-requiring enzyme 1α-X-box binding protein 1 pathway reduced the advantage of Igsf6 deficiency in bactericidal capacity. Together, our findings provide insight into the role of IgSF6 in intestinal macrophages that modulate the ER stress response and maintain intestinal homeostasis.
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Affiliation(s)
- Yuting Wu
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Panrui Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Tianlu Shi
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Dan Cao
- Department of Gastroenterology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
| | - Wen Pan
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China; Department of Gastroenterology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
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2
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Selvakumar B, Sekar P, Samsudin AR. Intestinal macrophages in pathogenesis and treatment of gut leakage: current strategies and future perspectives. J Leukoc Biol 2024; 115:607-619. [PMID: 38198217 DOI: 10.1093/jleuko/qiad165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 11/13/2023] [Accepted: 12/08/2023] [Indexed: 01/12/2024] Open
Abstract
Macrophages play key roles in tissue homeostasis, defense, disease, and repair. Macrophages are highly plastic and exhibit distinct functional phenotypes based on micro-environmental stimuli. In spite of several advancements in understanding macrophage biology and their different functional phenotypes in various physiological and pathological conditions, currently available treatment strategies targeting macrophages are limited. Macrophages' high plasticity and diverse functional roles-including tissue injury and wound healing mechanisms-mark them as potential targets to mine for efficient therapeutics to treat diseases. Despite mounting evidence on association of gut leakage with several extraintestinal diseases, there is no targeted standard therapy to treat gut leakage. Therefore, there is an urgent need to develop therapeutic strategies to treat this condition. Macrophages are the cells that play the largest role in interacting with the gut microbiota in the intestinal compartment and exert their intended functions in injury and repair mechanisms. In this review, we have summarized the current knowledge on the origins and phenotypes of macrophages. The specific role of macrophages in intestinal barrier function, their role in tissue repair mechanisms, and their association with gut microbiota are discussed. In addition, currently available therapies and the putative tissue repair mediators of macrophages for treating microbiota dysbiosis induced gut leakage are also discussed. The overall aim of this review is to convey the intense need to screen for microbiota induced macrophage-released prorepair mediators, which could lead to the identification of potential candidates that could be developed for treating the leaky gut and associated diseases.
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Affiliation(s)
- Balachandar Selvakumar
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
| | - Priyadharshini Sekar
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
| | - A Rani Samsudin
- Department of Microbiota, Research Institute for Medical and Health Sciences, College of Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, University City Road, Sharjah, 27272, United Arab Emirates
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3
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Han YZ, Zheng HJ, Du BX, Zhang Y, Zhu XY, Li J, Wang YX, Liu WJ. Role of Gut Microbiota, Immune Imbalance, and Allostatic Load in the Occurrence and Development of Diabetic Kidney Disease. J Diabetes Res 2023; 2023:8871677. [PMID: 38094870 PMCID: PMC10719010 DOI: 10.1155/2023/8871677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 11/15/2023] [Accepted: 11/27/2023] [Indexed: 12/18/2023] Open
Abstract
Diabetic kidney disease (DKD) is a prevailing complication arising from diabetes mellitus. Unfortunately, there are no trustworthy and efficacious treatment modalities currently available. In recent times, compelling evidence has emerged regarding the intricate correlation between the kidney and the gut microbiota, which is considered the largest immune organ within the human physique. Various investigations have demonstrated that the perturbation of the gut microbiota and its associated metabolites potentially underlie the etiology and progression of DKD. This phenomenon may transpire through perturbation of both the innate and the adaptive immunity, leading to a burdensome allostatic load on the body and ultimately culminating in the development of DKD. Within this literature review, we aim to delve into the intricate interplay between the gut microbiota, its metabolites, and the immune system in the context of DKD. Furthermore, we strive to explore and elucidate potential chemical interventions that could hold promise for the treatment of DKD, thereby offering invaluable insights and directions for future research endeavors.
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Affiliation(s)
- Yi Zhen Han
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Hui Juan Zheng
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Bo Xuan Du
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Yi Zhang
- Dongfang Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Xing Yu Zhu
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Jing Li
- Graduate School, Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Yao Xian Wang
- Beijing University of Chinese Medicine, Beijing, China
| | - Wei Jing Liu
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
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4
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Lacticaseibacillus casei Strain Shirota Modulates Macrophage-Intestinal Epithelial Cell Co-Culture Barrier Integrity, Bacterial Sensing and Inflammatory Cytokines. Microorganisms 2022; 10:microorganisms10102087. [PMID: 36296363 PMCID: PMC9607601 DOI: 10.3390/microorganisms10102087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/03/2022] [Accepted: 10/06/2022] [Indexed: 11/06/2022] Open
Abstract
Probiotic bacteria modulate macrophage immune inflammatory responses, with functional cytokine responses determined by macrophage subset polarisation, stimulation and probiotic strain. Mucosal macrophages exhibit subset functional heterogeneity but are organised in a 3-dimensional tissue, over-laid by barrier epithelial cells. This study aimed to investigate the effects of the probiotic Lacticaseibacillus casei strain Shirota (LcS) on macrophage-epithelial cell cytokine responses, pattern recognition receptor (PRR) expression and LPS responses and the impacts on barrier integrity. THP-1-derived M1 and M2 subset macrophages were co-cultured in a transwell system with differentiated Caco-2 epithelial cells in the presence or absence of enteropathogenic LPS. Both Caco-2 cells in monoculture and macrophage co-culture were assayed for cytokines, PRR expression and barrier integrity (TEER and ZO-1) by RT-PCR, ELISA, IHC and electrical resistance. Caco-2 monocultures expressed distinct cytokine profiles (IL-6, IL-8, TNFα, endogenous IL-10), PRRs and barrier integrity, determined by inflammatory context (TNFα or IL-1β). In co-culture, LcS rescued ZO-1 and TEER in M2/Caco-2, but not M1/Caco-2. LcS suppressed TLR2, TLR4, MD2 expression in both co-cultures and differentially regulated NOD2, TLR9, Tollip and cytokine secretion. In conclusion, LcS selectively modulates epithelial barrier integrity, pathogen sensing and inflammatory cytokine profile; determined by macrophage subset and activation status.
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5
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The Crosstalk between the Gut Microbiota Composition and the Clinical Course of Allergic Rhinitis: The Use of Probiotics, Prebiotics and Bacterial Lysates in the Treatment of Allergic Rhinitis. Nutrients 2022; 14:nu14204328. [PMID: 36297012 PMCID: PMC9607052 DOI: 10.3390/nu14204328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/12/2022] [Accepted: 10/14/2022] [Indexed: 11/26/2022] Open
Abstract
Although massive progress in discovering allergic rhinitis (AR) aetiology has been made in recent years, its prevalence is still rising and it significantly impacts patients' lives. That is why further and non-conventional research elucidating the role of new factors in AR pathogenesis is needed, facilitating discoveries of new treatment approaches. One of these factors is the gut microbiota, with its specific roles in health and disease. This review presents the process of gut microbiota development, especially in early life, focusing on its impact on the immune system. It emphasizes the link between the gut microbiota composition and immune changes involved in AR development. Specifically, it elucidates the significant link between bacteria colonizing the gut and the Th1/Th2 imbalance. Probiotics, prebiotics and bacterial lysates, which are medications that restore the composition of intestinal bacteria and indirectly affect the clinical course of AR, are also discussed.
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6
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Rey-Mariño A, Francino MP. Nutrition, Gut Microbiota, and Allergy Development in Infants. Nutrients 2022; 14:nu14204316. [PMID: 36297000 PMCID: PMC9609088 DOI: 10.3390/nu14204316] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/09/2022] [Accepted: 10/11/2022] [Indexed: 11/07/2022] Open
Abstract
The process of gut microbiota development in infants is currently being challenged by numerous factors associated with the contemporary lifestyle, including diet. A thorough understanding of all aspects of microbiota development will be necessary for engineering strategies that can modulate it in a beneficial direction. The long-term consequences for human development and health of alterations in the succession pattern that forms the gut microbiota are just beginning to be explored and require much further investigation. Nevertheless, it is clear that gut microbiota development in infancy bears strong associations with the risk for allergic disease. A useful understanding of microbial succession in the gut of infants needs to reveal not only changes in taxonomic composition but also the development of functional capacities through time and how these are related to diet and various environmental factors. Metagenomic and metatranscriptomic studies have started to produce insights into the trends of functional repertoire and gene expression change within the first year after birth. This understanding is critical as during this period the most substantial development of the gut microbiota takes place and the relations between gut microbes and host immunity are established. However, further research needs to focus on the impact of diet on these changes and on how diet can be used to counteract the challenges posed by modern lifestyles to microbiota development and reduce the risk of allergic disease.
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Affiliation(s)
- Alejandra Rey-Mariño
- Genomics and Health Department, Foundation for the Promotion of Health and Biomedical Research of the Valencia Region (FISABIO), 46020 València, Spain
| | - M. Pilar Francino
- Genomics and Health Department, Foundation for the Promotion of Health and Biomedical Research of the Valencia Region (FISABIO), 46020 València, Spain
- CIBER en Epidemiología y Salud Pública (CIBERESP), 28001 Madrid, Spain
- Correspondence:
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7
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León ED, Francino MP. Roles of Secretory Immunoglobulin A in Host-Microbiota Interactions in the Gut Ecosystem. Front Microbiol 2022; 13:880484. [PMID: 35722300 PMCID: PMC9203039 DOI: 10.3389/fmicb.2022.880484] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 05/09/2022] [Indexed: 12/12/2022] Open
Abstract
In the gastrointestinal tract (GIT), the immune system interacts with a variety of microorganisms, including pathogens as well as beneficial symbionts that perform important physiological functions for the host and are crucial to sustain intestinal homeostasis. In normal conditions, secretory immunoglobulin A (SIgA) is the principal antibody produced by B cells in the GIT mucosa. Polyreactivity provides certain SIgA molecules with the ability of binding different antigens in the bacterial surface, such as O-antigens and teichoic acids, while cross-species reactivity allows them to recognize and interact with different types of bacteria. These functions may be crucial in allowing SIgA to modulate the complex gut microbiota in an efficient manner. Several studies suggest that SIgA can help with the retention and proliferation of helpful members of the gut microbiota. Gut microbiota alterations in people with IgA deficiency include the lack of some species that are known to be normally coated by SIgA. Here, we discuss the different ways in which SIgA behaves in relation to pathogens and beneficial bacteria of the gut microbiota and how the immune system might protect and facilitate the establishment and maintenance of certain gut symbionts.
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Affiliation(s)
- E Daniel León
- Department of Genomics and Health, Fundación Para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat Valenciana (FISABIO), Valencia, Spain
| | - M Pilar Francino
- Department of Genomics and Health, Fundación Para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat Valenciana (FISABIO), Valencia, Spain.,CIBER en Epidemiología y Salud Pública, Madrid, Spain
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8
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Jasiński M, Biliński J, Basak GW. The Role of the Crosstalk Between Gut Microbiota and Immune Cells in the Pathogenesis and Treatment of Multiple Myeloma. Front Immunol 2022; 13:853540. [PMID: 35432306 PMCID: PMC9009288 DOI: 10.3389/fimmu.2022.853540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/28/2022] [Indexed: 11/26/2022] Open
Abstract
Around 10% of all hematologic malignancies are classified as multiple myeloma (MM), the second most common malignancy within that group. Although massive progress in developing of new drugs against MM has been made in recent years, MM is still an incurable disease, and every patient eventually has relapse refractory to any known treatment. That is why further and non-conventional research elucidating the role of new factors in MM pathogenesis is needed, facilitating discoveries of the new drugs. One of these factors is the gut microbiota, whose role in health and disease is still being explored. This review presents the continuous changes in the gut microbiota composition during our whole life with a particular focus on its impact on our immune system. Additionally, it mainly focuses on the chronic antigenic stimulation of B-cells as the leading mechanism responsible for MM promotion. The sophisticated interactions between microorganisms colonizing our gut, immune cells (dendritic cells, macrophages, neutrophils, T/B cells, plasma cells), and intestinal epithelial cells will be shown. That article summarizes the current knowledge about the initiation of MM cells, emphasizing the role of microorganisms in that process.
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Affiliation(s)
- Marcin Jasiński
- Department of Hematology, Transplantation and Internal Medicine, Medical University of Warsaw, Warsaw, Poland.,Doctoral School, Medical University of Warsaw, Warsaw, Poland
| | - Jarosław Biliński
- Department of Hematology, Transplantation and Internal Medicine, Medical University of Warsaw, Warsaw, Poland.,Human Biome Institute, Gdańsk, Poland
| | - Grzegorz W Basak
- Department of Hematology, Transplantation and Internal Medicine, Medical University of Warsaw, Warsaw, Poland.,Human Biome Institute, Gdańsk, Poland
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9
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Rahiman N, Zamani P, Badiee A, Arabi L, Alavizadeh SH, Jaafari MR. An insight into the role of liposomal therapeutics in the reversion of Multiple Sclerosis. Expert Opin Drug Deliv 2021; 18:1795-1813. [PMID: 34747298 DOI: 10.1080/17425247.2021.2003327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Multiple Sclerosis (MS), as an autoimmune disease, has complicated immunopathology, which makes its management relevant to various factors. Novel pharmaceutical vehicles, especially liposomes, can support efficacious handling of this disease both in early detection and prognosis and also in a therapeutic manner. The most well-known trigger of MS onset is the predominance of cellular to humoral immunity and enhancement of inflammatory cytokines level. The installation of liposomes as nanoparticles to control this disease holds great promise up to now. AREAS COVERED Various types of liposomes with different properties and purposes have been formulated and targeted immune cells with their surface manipulations. They may be encapsulated with anti-inflammatory, MS-related therapeutics, or immunodominant myelin-specific peptides for attaining a higher therapeutic efficacy of the drugs or tolerance induction. Cationic liposomes are also highly applicable for gene delivery of the anti-inflammatory cytokines or silencing the inflammatory cytokines. Liposomes have also been used as biotools for comprehending MS pathomechanisms or as diagnostic agents. EXPERT OPINION The efforts to manage MS through nanomedicine, especially liposomal therapeutics, pave a new avenue to a high-throughput medication of this autoimmune disease and their translation to the clinic in the future for overcoming the challenges that MS patients confront.
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Affiliation(s)
- Niloufar Rahiman
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Parvin Zamani
- Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ali Badiee
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Leila Arabi
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyedeh Hoda Alavizadeh
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahmoud Reza Jaafari
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmaceutical Nanotechnology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.,Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
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10
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Cookson TA. Bacterial-Induced Blood Pressure Reduction: Mechanisms for the Treatment of Hypertension via the Gut. Front Cardiovasc Med 2021; 8:721393. [PMID: 34485420 PMCID: PMC8414577 DOI: 10.3389/fcvm.2021.721393] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 07/16/2021] [Indexed: 01/08/2023] Open
Abstract
Hypertension is a major risk factor for the development of cardiovascular disease. As more research into the gut microbiome emerges, we are finding increasing evidence to support that these microbes may have significant positive and negative effects on blood pressure and associated disorders. The bacterial-derived metabolites that are produced in the gut are capable of widespread effects to several tissue types and organs in the body. It is clear that the extensive metabolic function that is lost with gut dysbiosis is unlikely to be replenished with a single metabolite or bacterial strain. Instead, combinations of bacteria and concomitant therapies will provide a more well-rounded solution to manage hypertension. The bioactive molecules that are recognized in this review will inform on ideal characteristics of candidate bacteria and provide direction for future research on the gut microbiome in hypertension.
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11
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Yuan X, Luo C, Wu J, Li W, Guo X, Li S, Wang B, Sun H, Tang L. Abdominal paracentesis drainage attenuates intestinal mucosal barrier damage through macrophage polarization in severe acute pancreatitis. Exp Biol Med (Maywood) 2021; 246:2029-2038. [PMID: 34053233 PMCID: PMC8474980 DOI: 10.1177/15353702211015144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 04/12/2021] [Indexed: 11/15/2022] Open
Abstract
Abdominal paracentesis drainage (APD), as an effective treatment of severe acute pancreatitis (SAP) in clinical settings, can ameliorate intestinal barrier damage and the overall severity of SAP. However, the mechanism underlying therapeutic effects of APD on damaged intestinal mucosal barrier during SAP is still unclear. Here, SAP was induced by injecting 5% Na-taurocholate retrograde into the biliopancreatic duct of rats to confirm the benefits of APD on enteral injury of SAP and further explore the possible mechanism. Abdominal catheter was placed after SAP was induced in APD group. As control group, the sham group received no operation except abdominal opening and closure. By comparing changes among control group, sham group, and APD group, APD treatment obviously lowered the intestinal damage and reduced the permeation of intestinal mucosal barrier, which was evidenced by intestinal H&E staining, enteral expression of tight junction proteins, intestinal apoptosis measurement and detection of serum diamine oxidase, intestinal fatty acid binding protein and D-lactic acid. Furthermore, we found that APD polarized intestinal macrophages toward M2 phenotype by the determination of immunofluorescence and western blotting, and this accounts for the benefits of APD for intestinal injury in SAP. Importantly, the protective effect against intestinal injury by APD treatment was mediated through the inhibited ASK1/JNK pathway. In summary, APD improved the intestinal mucosal barrier damage in rats with SAP through an increasing portion of M2 phenotype macrophages in intestine via inhibiting ASK1/JNK pathway.
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Affiliation(s)
- Xiaohui Yuan
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
| | - Chen Luo
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
- Department of Hepatopancreatobiliary Surgery, Panzhihua Central
Hospital, Panzhihua 617000, China
| | - Jun Wu
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
| | - Wei Li
- Laboratory of Basic Medical Sciences, The General Hospital of
Western Theater Command, Chengdu 610083, China
| | - Xin Guo
- Laboratory of Basic Medical Sciences, The General Hospital of
Western Theater Command, Chengdu 610083, China
| | - Shuai Li
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
| | - Bing Wang
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
| | - Hongyu Sun
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
- Laboratory of Basic Medical Sciences, The General Hospital of
Western Theater Command, Chengdu 610083, China
| | - Lijun Tang
- College of Medicine, Southwest Jiaotong University, Chengdu
610031, China
- Department of General Surgery & Pancreatic Injury and Repair
Key Laboratory of Sichuan Province, The General Hospital of Western Theater
Command, Chengdu 610083, China
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12
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Lopes TCM, Almeida GG, Souza IA, Borges DC, de Lima WG, Prazeres PHDM, Birbrair A, Arantes RME, Mosser DM, Goncalves R. High-Density-Immune-Complex Regulatory Macrophages Promote Recovery of Experimental Colitis in Mice. Inflammation 2021; 44:1069-1082. [PMID: 33394188 DOI: 10.1007/s10753-020-01403-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/29/2020] [Accepted: 12/13/2020] [Indexed: 12/12/2022]
Abstract
Macrophages not only play a fundamental role in the pathogenesis of inflammatory bowel disease (IBD), but they also play a major role in preserving intestinal homeostasis. In this work, we evaluated the role of macrophages in IBD and investigated whether the functional reprogramming of macrophages to a very specific phenotype could decrease disease pathogenesis. Thus, macrophages were stimulated in the presence of high-density immune complexes which strongly upregulate their production of IL-10 and downregulate pro-inflammatory cytokines. The transfer of these high-density-immune-complex regulatory macrophages into mice with colitis was examined as a potential therapy proposal to control the disease. Animals subjected to colitis induction received these high-density-immune-complex regulatory macrophages, and then the Disease Activity Index (DAI), and macroscopic and microscopic lesions were measured. The treated group showed a dramatic improvement in all parameters analyzed, with no difference with the control group. The colon was macroscopically normal in appearance and size, and microscopically colon architecture was preserved. The immunofluorescence migration assay showed that these cells migrated to the inflamed intestine, being able to locally produce the cytokine IL-10, which could explain the dramatic improvement in the clinical and pathological condition of the animals. Thus, our results demonstrate that the polarization of macrophages to a high IL-10 producer profile after stimulation with high-density immune complexes was decisive in controlling experimental colitis, and that macrophages are a potential therapeutic target to be explored in the control of colitis.
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Affiliation(s)
- Tamara Cristina Moreira Lopes
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil
| | | | - Izabela Aparecida Souza
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil
| | - Diego Costa Borges
- Departamento de Bioquímica e Imunologia-Instituto de Ciências Biológicas, UFMG, Belo Horizonte, MG, Brazil
| | - Wanderson Geraldo de Lima
- Departamento de Ciências Biológicas-Instituto de Ciências Biológicas e Exatas, Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil
| | - Pedro Henrique Dias Moura Prazeres
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil
| | - Alexander Birbrair
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil
| | - Rosa Maria Esteves Arantes
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil
| | - David M Mosser
- Laboratory of Macrophage and Host Defense - Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD, USA
| | - Ricardo Goncalves
- Departamento de Patologia Geral-Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
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13
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Almeida JFMD, Chehter EZ. COVID-19 and the gastrointestinal tract: what do we already know? EINSTEIN-SAO PAULO 2020; 18:eRW5909. [PMID: 33206816 PMCID: PMC7647386 DOI: 10.31744/einstein_journal/2020rw5909] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 08/27/2020] [Indexed: 12/12/2022] Open
Abstract
The new coronavirus disease pandemic is defining 2020, with almost 17.5 million infected individuals and 700 thousand deaths up to beginning of August. It is caused by SARS-CoV-2 and the transmission is through the respiratory tract. Those infected may be asymptomatic, present typical symptoms (fever, dry cough and dyspnea), gastrointestinal symptoms (diarrhea, nausea, vomiting and abdominal pain) and viral RNA in stools. The objective of this work was to review the literature related to the prevalence of gastrointestinal symptoms, and to check the possibility of fecal-oral transmission. We searched PubMed® database on COVID-19 and gastrointestinal tract and selected articles using the PRISMA method. We eliminated articles based on titles and abstracts, small number of patients and the mechanism of infection, leaving 14 studies. Comorbidities and laboratory alterations (elevation of hepatic aminotransferases and bilirubin) were related to worsening of the disease. The prevalence of gastrointestinal symptoms ranged from 6.8% to 61.3%, including diarrhea (8.14% to 33.7%), nausea/vomiting (1.53% to 26.4%), anorexia (12.1% to 40.0%) and abdominal pain (0% to 14.5%). The presence of viral RNA in stools was rarely tested, but positive in 0% to 48.1%. The gastrointestinal tract is affected by COVID-19, causing specific symptoms, laboratory alterations and viral presence in the feces. However, the results of prevalence and possibility of fecal-oral transmission were varied, requiring further studies for more assertive conclusions. It is important that healthcare professionals draw attention to this fact, since these changes can help make diagnosis and initiate early treatment.
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14
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Niu J, Liu X, Zhang Z, Huang Y, Tang J, Wang B, Lu Y, Cai J, Jian J. A tandem-repeat galectin-4 from Nile tilapia (Oreochromis niloticus) is involved in immune response to bacterial infection via mediating pathogen recognition and opsonization. Mol Immunol 2020; 127:67-77. [PMID: 32927166 DOI: 10.1016/j.molimm.2020.08.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/29/2020] [Accepted: 08/31/2020] [Indexed: 12/23/2022]
Abstract
Galectins are the family of carbohydrate-binding proteins that participate in host-pathogen interaction. In this study, a galectin-4 homolog (OnGal-4) from Nile tilapia (Oreochromis niloticus) was characterized. The open reading frame of OnGal-4 was 1194 bp, encoding a peptide of 397 amino including two CRD regions and two carbohydrate recognition sites. OnGal-4 mRNA was expressed in all examined tissues with the highest level in spleen. After Streptococcus agalactiae (S.agalactiae) challenge, the OnGal-4 expression was up-regulated in the spleen, head kidney, brain, and monocytes/macrophages (Mo/MΦ). The in vitro experiments showed that recombinant OnGal-4 (rOnGal-4) protein could bind and agglutinate S.agalactiae and A.hydrophila. Also, rOnGal-4 could induce cytokines expressions and increased bactericidal activity of Mo/MΦ. Further in vivo analysis indicated that OnGal-4 overexpression could protect O.niloticus from S.agalactiae infection through modulating inflammation response. Our study suggested that OnGal-4 could improve immune response against bacterial infection by mediating pathogen recognition and opsonization.
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Affiliation(s)
- Jinzhong Niu
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China
| | - Xinchao Liu
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China
| | - Zhiqiang Zhang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China
| | - Yu Huang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China
| | - Jufen Tang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China
| | - Bei Wang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China
| | - Yishan Lu
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China
| | - Jia Cai
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China; Guangxi Key Lab for Marine Natural Products and Combinational Biosynthesis Chemistry, Guangxi Beibu Gulf Marine Research Centre, Guangxi Academy of Sciences, Nanning, China.
| | - Jichang Jian
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animal, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang, GD, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong ProvincialEngineeringResearchCenter for AquaticAnimalHealthAssessment, Shenzhen, 518120, China.
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15
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Moreira Lopes TC, Mosser DM, Gonçalves R. Macrophage polarization in intestinal inflammation and gut homeostasis. Inflamm Res 2020; 69:1163-1172. [PMID: 32886145 DOI: 10.1007/s00011-020-01398-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 07/21/2020] [Accepted: 08/30/2020] [Indexed: 12/19/2022] Open
Abstract
Gut homeostasis is a process that requires a prudent balance of host responses to the beneficial enteric microbial community and the pathogenic stimuli that can arise. The lack of this balance in the intestine can result in inflammatory bowel diseases, where the immune system dysfunctions leading to exacerbated inflammatory responses. In this process, macrophages are considered to play a pivotal role. In this review, we describe the important role of macrophages in maintaining intestinal homeostasis and we discuss how altered macrophage function may lead to inflammatory bowel diseases. The plasticity of macrophages during the gut inflammatory response shows the broad role of these cells in orchestrating not only the onset of inflammation but also its termination as well as healing and repair. Indeed, the state of macrophage polarization can be the key factor in defining the resolution or the progression of inflammation and disease. Here, we discuss the different populations of macrophages and their implication in development, propagation, control and resolution of inflammatory bowel diseases.
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Affiliation(s)
- Tamara Cristina Moreira Lopes
- Laboratório de Biologia de Macrófagos e Monócitos, Departamento de Patologia Geral, Instituto de Ciências Biológicas-Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - David M Mosser
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD, USA
| | - Ricardo Gonçalves
- Laboratório de Biologia de Macrófagos e Monócitos, Departamento de Patologia Geral, Instituto de Ciências Biológicas-Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil.
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16
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Jia Y, Anwaar S, Li L, Yin Z, Ye Z, Huang Z. A new target for the treatment of inflammatory bowel disease: Interleukin-37. Int Immunopharmacol 2020; 83:106391. [PMID: 32208166 DOI: 10.1016/j.intimp.2020.106391] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 02/22/2020] [Accepted: 03/08/2020] [Indexed: 12/19/2022]
Abstract
Interleukin (IL)-37 belongs to the IL-1 cytokine family. It has anti-inflammatory effects on numerous autoimmune diseases such as asthma, psoriasis, inflammatory bowel disease (IBD), systemic lupus erythematosus (SLE), multiple sclerosis (MS) and rheumatoid arthritis (RA). Mechanistically, IL-37 plays an anti-inflammatory role by regulating the expression of inflammatory factors in two ways: binding extracellular receptors IL-18R or transferring into the nucleus with Smad3. IBD is a kind of idiopathic intestinal inflammatory disease with unknown etiology and pathogenesis. Recent researches had proved that IL-37 is negatively involved in the pathogenesis and development of IBD. Among various inflammatory diseases, IL-37 has been shown to regulate inflammatory development by acting on various immune cells such as neutrophils, macrophages (Mϕ), dendritic cells (DCs), T cells and intestinal epithelial cells. This review summarizes the biological role of IL-37, and its immunoregulatory effects on the immune cells, especially anti-inflammatory function in both human and experimental models of IBD.
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Affiliation(s)
- Yuning Jia
- Biological Therapy Institute, Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Health Science Center, Shenzhen University, Shenzhen 518055, China
| | - Shoaib Anwaar
- Biological Therapy Institute, Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Health Science Center, Shenzhen University, Shenzhen 518055, China
| | - Linyun Li
- Biological Therapy Institute, Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Health Science Center, Shenzhen University, Shenzhen 518055, China
| | - Zhihua Yin
- Shenzhen City Futian Qu Rheumatology Specialist Hospital, Shenzhen 518089, China
| | - Zhizhon Ye
- Shenzhen City Futian Qu Rheumatology Specialist Hospital, Shenzhen 518089, China.
| | - Zhong Huang
- Biological Therapy Institute, Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Health Science Center, Shenzhen University, Shenzhen 518055, China.
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17
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Desalegn G, Pabst O. Inflammation triggers immediate rather than progressive changes in monocyte differentiation in the small intestine. Nat Commun 2019; 10:3229. [PMID: 31324779 PMCID: PMC6642215 DOI: 10.1038/s41467-019-11148-2] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 06/17/2019] [Indexed: 12/14/2022] Open
Abstract
Bone marrow-derived circulating monocytes contribute to the replenishment and maintenance of the intestinal macrophage population. Intestinal monocytes undergo context-dependent phenotypic and functional adaptations to either maintain local immune balance or support intestinal inflammation. Here we use monocyte adoptive transfer to dissect the dynamics of monocyte-to-macrophage differentiation in normal and inflamed small intestine. We find that during homeostasis CCR2 and β7-integrin mediate constitutive homing of monocytes to the gut. By contrast, intestinal inflammation increases monocyte recruitment via CCR2, but not β7-integrin. In the non-inflamed intestine, monocytes gradually differentiate to express genes typically associated with tolerogenic macrophage functions. Conversely, immediately upon entry into the inflamed intestine, monocytes adapt a different expression pattern in a partly Trem-1-dependent manner. Our observations suggest that inflammation fundamentally changes the kinetics and modalities of monocyte differentiation in tissues. Bone marrow-derived monocytes are recruited to the gut to replenish the local macrophage pool. Here the authors show that, while such replenishment constitutively occur under homeostasis, gut inflammation induces an immediate, Trem1-related transcription change to recruited monocyte to enable a context-dependent modulation of macrophage functions.
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Affiliation(s)
- Girmay Desalegn
- Institute of Molecular Medicine, RWTH Aachen University, D-52074, Aachen, Germany.,Institute of Immunology, Hannover Medical School, D-30625, Hannover, Germany
| | - Oliver Pabst
- Institute of Molecular Medicine, RWTH Aachen University, D-52074, Aachen, Germany.
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18
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Hong SH, Shin JS, Chung H, Park CG. Galectin-4 Interaction with CD14 Triggers the Differentiation of Monocytes into Macrophage-like Cells via the MAPK Signaling Pathway. Immune Netw 2019; 19:e17. [PMID: 31281714 PMCID: PMC6597441 DOI: 10.4110/in.2019.19.e17] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 05/13/2019] [Accepted: 05/19/2019] [Indexed: 02/08/2023] Open
Abstract
Galectin-4 (Gal-4) is a β-galactoside-binding protein mostly expressed in the gastrointestinal tract of animals. Although intensive functional studies have been done for other galectin isoforms, the immunoregulatory function of Gal-4 still remains ambiguous. Here, we demonstrated that Gal-4 could bind to CD14 on monocytes and induce their differentiation into macrophage-like cells through the MAPK signaling pathway. Gal-4 induced the phenotypic changes on monocytes by altering the expression of various surface molecules, and induced functional changes such as increased cytokine production and matrix metalloproteinase expression and reduced phagocytic capacity. Concomitant with these changes, Gal-4-treated monocytes became adherent and showed elongated morphology with higher expression of macrophage markers. Notably, we found that Gal-4 interacted with CD14 and activated the MAPK signaling cascade. Therefore, these findings suggest that Gal-4 may exert the immunoregulatory functions through the activation and differentiation of monocytes.
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Affiliation(s)
- So-Hee Hong
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul 03080, Korea.,Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 03080, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Jun-Seop Shin
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul 03080, Korea.,Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 03080, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Hyunwoo Chung
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul 03080, Korea.,Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Chung-Gyu Park
- Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul 03080, Korea.,Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 03080, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.,Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul 03080, Korea
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19
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Microbiome of the Skin and Gut in Atopic Dermatitis (AD): Understanding the Pathophysiology and Finding Novel Management Strategies. J Clin Med 2019; 8:jcm8040444. [PMID: 30987008 PMCID: PMC6518061 DOI: 10.3390/jcm8040444] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 03/25/2019] [Accepted: 03/28/2019] [Indexed: 12/14/2022] Open
Abstract
Atopic dermatitis (AD) is a long-standing inflammatory skin disease that is highly prevalent worldwide. Multiple factors contribute to AD, with genetics as well as the environment affecting disease development. Although AD shows signs of skin barrier defect and immunological deviation, the mechanism underlying AD is not well understood, and AD treatment is often very difficult. There is substantial data that AD patients have a disturbed microbial composition and lack microbial diversity in their skin and gut compared to controls, which contributes to disease onset and atopic march. It is not clear whether microbial change in AD is an outcome of barrier defect or the cause of barrier dysfunction and inflammation. However, a cross-talk between commensals and the immune system is now noticed, and their alteration is believed to affect the maturation of innate and adaptive immunity during early life. The novel concept of modifying skin and gut microbiome by applying moisturizers that contain nonpathogenic biomass or probiotic supplementation during early years may be a preventive and therapeutic option in high risk groups, but currently lacks evidence. This review discusses the nature of the skin and gut flora in AD, possible mechanisms of skin-gut interaction, and the therapeutic implications of microbiome correction in AD.
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20
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Mai W, Liu X, Wang J, Zheng J, Wang X, Zhou W. Protective effects of CX3CR1 on autoimmune inflammation in a chronic EAE model for MS through modulation of antigen-presenting cell-related molecular MHC-II and its regulators. Neurol Sci 2019; 40:779-791. [PMID: 30671738 DOI: 10.1007/s10072-019-3721-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 01/12/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND Recent evidences have implicated neuroprotective effects of CX3CR1 in multiple sclerosis (MS). But whether CX3CR1 is involved in modulation of antigen-presenting cell (APC)-related molecular MHC-II and what the possible mechanism is remain unidentified. OBJECTIVE In this study, we intended to investigate the effects of CX3CR1 on MHC-II expressions on brain myeloid cells in experimental autoimmune encephalomyelitis (EAE) mice and explore the possible regulators for it. METHODS CX3CR1-deficient EAE mice were created. Disease severity, pathological damage, and the expressions of MHC-II and its mediators on myeloid cells were detected. RESULTS We found that compare with wile-typed EAE mice, CX3CR1-deficient EAE mice exhibited more severe disease severity. An accumulation of CD45+CD115+Ly6C-CD11c+ cells was reserved in the affected EAE brain of CX3CR1-deficient mice, consistent with disease severity and pathological damage in the brain. The expressions of MHC-II on the brain CD45+CD115+Ly6C-CD11c+ cells of CX3CR1-deficient EAE mice were elevated, in accord with the increased protein and mRNA expressions of class II transactivator (CIITA) and interferon regulatory factor-1 (IRF-1). CONCLUSIONS The findings indicated that CX3CR1 might be an important regulator for MHC-II expressions on APCs, playing a beneficial role in EAE. The mechanism was probably through regulation on the MHC-II regulators CIITA and IRF-1.
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Affiliation(s)
- Weihua Mai
- Department of Neurology, The Fifth Affiliated Hospital of Sun Yat-sen University, NO. 52 East Meihua Road, Zhuhai, 519000, Guangdong Province, China.
| | - Xingwei Liu
- Department of General Surgery, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Junfeng Wang
- Department of Neurology, The Fifth Affiliated Hospital of Sun Yat-sen University, NO. 52 East Meihua Road, Zhuhai, 519000, Guangdong Province, China
| | - Jing Zheng
- Department of Nephrology, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Xiao Wang
- Department of General Surgery, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Wenying Zhou
- Department of Laboratory Science, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
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21
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Abstract
PURPOSE OF REVIEW We review how an altered microbiome in early life impacts on immune, metabolic, and neurological development, focusing on some of the most widespread diseases related to each of these processes, namely atopic disease, obesity, and autism. RECENT FINDINGS The early development of the microbial communities that inhabit the human body is currently challenged by factors that range from reduced exposure to microbes, antibiotic use, and poor dietary choices to widespread environmental pollution. Recent work has highlighted some of the long-term consequences that early alterations in the establishment of these microbiotas can have for different aspects of human development and health. The long-term consequences of early microbiome alterations for human development and health are only beginning to be understood and will require in-depth investigation in the years to come. A solid understanding of how present day environmental conditions alter microbiome development, and of how an altered microbiome in early life impacts on life-long health, should inform both public health policies and the development of dietary and medical strategies to counteract early microbiota imbalances.
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Affiliation(s)
- Yvonne Vallès
- Department of Biological and Chemical Sciences, The University of the West Indies, Cave Hill campus, Cave Hill, Barbados
| | - M Pilar Francino
- Unitat Mixta d'Investigació en Genòmica i Salut, Fundació per al Foment de la Investigació Sanitària i Biomèdica de la Comunitat Valenciana (FISABIO-Salut Pública)/Institut de Biologia Integrativa de Sistemes (Universitat de València), Avda. Catalunya 21, 46020, València, Spain.
- CIBER en Epidemiología y Salud Pública (CIBERESP), Madrid, Spain.
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22
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Intestinal Lamina Propria CD4 + T Cells Promote Bactericidal Activity of Macrophages via Galectin-9 and Tim-3 Interaction during Salmonella enterica Serovar Typhimurium Infection. Infect Immun 2018; 86:IAI.00769-17. [PMID: 29844236 DOI: 10.1128/iai.00769-17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 05/21/2018] [Indexed: 12/13/2022] Open
Abstract
The intestinal immune system is crucial for protection from pathogenic infection and maintenance of mucosal homeostasis. We studied the intestinal immune microenvironment in a Salmonella enterica serovar Typhimurium intestinal infection mouse model. Intestinal lamina propria macrophages are the main effector cells in innate resistance to intracellular microbial pathogens. We found that S Typhimurium infection augmented Tim-3 expression on intestinal lamina propria CD4+ T cells and enhanced galectin-9 expression on F4/80+ CD11b+ macrophages. Moreover, CD4+ T cells promoted the activation and bactericidal activity of intestinal F4/80+ CD11b+ macrophages via the Tim-3/galectin-9 interaction during S Typhimurium infection. Blocking the Tim-3/galectin-9 interaction with α-lactose significantly attenuated the bactericidal activity of intracellular S Typhimurium by macrophages. Furthermore, the Tim-3/galectin-9 interaction promoted the formation and activation of inflammasomes, which led to caspase-1 cleavage and interleukin 1β (IL-1β) secretion. The secretion of active IL-1β further improved bactericidal activity of macrophages and galectin-9 expression on macrophages. These results demonstrated the critical role of the cross talk between CD4+ T cells and macrophages, particularly the Tim-3/galectin-9 interaction, in antimicrobial immunity and the control of intestinal pathogenic infections.
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23
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Goethel A, Croitoru K, Philpott DJ. The interplay between microbes and the immune response in inflammatory bowel disease. J Physiol 2018; 596:3869-3882. [PMID: 29806140 DOI: 10.1113/jp275396] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 05/08/2018] [Indexed: 12/18/2022] Open
Abstract
The aetiology and pathogenesis of inflammatory bowel disease (IBD) remains unclear but involves a complex interplay between genetic risk, environmental exposures, the immune system and the gut microbiota. Nearly two decades ago, the first susceptibility gene for Crohn's disease, NOD2, was identified within the IBD 1 locus. Since then, over 230 genetic risk loci have been associated with IBD and yet NOD2 remains the strongest association to date. As an intracellular innate immune sensor of bacteria, investigations into host-microbe interactions, involving both innate and adaptive immune responses, have become of particular interest in understanding the pathogenesis of IBD. Advancements in sequencing technology have lead to the groundbreaking characterization of the gut microbiota and its role in health and disease. While an altered microbiome has been described for IBD, whether it is a cause or an effect of the intestinal inflammation has yet to be determined. Moreover, the bidirectional relationship between the gut microbiota and the mucosal immune system adds to the multifaceted complexity of intestinal homeostasis. A better understanding of how host genetics, including NOD2, influence immune-microbe interactions and alter susceptibility to IBD is necessary in order to develop therapeutic and preventative treatments.
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Affiliation(s)
- Ashleigh Goethel
- Department of Immunology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Kenneth Croitoru
- Department of Immunology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Dana J Philpott
- Department of Immunology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
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24
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Bernardo D, Chaparro M, Gisbert JP. Human Intestinal Dendritic Cells in Inflammatory Bowel Diseases. Mol Nutr Food Res 2018; 62:e1700931. [PMID: 29336524 DOI: 10.1002/mnfr.201700931] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 01/03/2018] [Indexed: 12/21/2022]
Abstract
Inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis, is a serious, costly, and persistent health problem with an estimated prevalence in Western countries around 0.5% of the general population; its socioeconomic impact is comparable with that for chronic diseases such as diabetes. Conventional treatment involves escalating drug regimens with concomitant side effects followed, in some cases, by surgical interventions, which are often multiple, mainly in Crohn's disease. The goal of finding a targeted gut-specific immunotherapy for IBD patients is therefore an important unmet need. However, to achieve this goal we first must understand how dendritic cells (DC), the most potent antigen present cells of the immune system, control the immune tolerance in the gastrointestinal tract and how their properties are altered in those patients suffering from IBD. In this review, we summarize the current available information regarding human intestinal DC subsets composition, phenotype, and function in the human gastrointestinal tract describing how, in the IBD mucosa, DC display pro-inflammatory properties, which drive disease progression. A better understanding of the mechanisms inducing DC abnormal profile in IBD may provide us with novel tools to perform tissue specific immunomodulation.
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Affiliation(s)
- David Bernardo
- Gastroenterology Unit, Hospital Universitario de La Princesa and Instituto de Investigación Sanitaria Princesa (IIS-IP), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain
| | - María Chaparro
- Gastroenterology Unit, Hospital Universitario de La Princesa and Instituto de Investigación Sanitaria Princesa (IIS-IP), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain
| | - Javier P Gisbert
- Gastroenterology Unit, Hospital Universitario de La Princesa and Instituto de Investigación Sanitaria Princesa (IIS-IP), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain
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25
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Meers GK, Bohnenberger H, Reichardt HM, Lühder F, Reichardt SD. Impaired resolution of DSS-induced colitis in mice lacking the glucocorticoid receptor in myeloid cells. PLoS One 2018; 13:e0190846. [PMID: 29324769 PMCID: PMC5764312 DOI: 10.1371/journal.pone.0190846] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 12/06/2017] [Indexed: 01/28/2023] Open
Abstract
Inflammatory bowel disease (IBD) is a highly prevalent intestinal disorder for which no cure exists. Currently, the standard first-line treatment of IBD consists of systemic glucocorticoid (GC) application, even though therapy can be complicated by unresponsiveness or adverse effects. In view of the importance of macrophages and neutrophils for the pathogenesis of IBD we set out to define the relevance of these cell types as targets of GC using the mouse model of DSS-induced colitis. We found that the disease did not resolve in GRlysM mice lacking the GC receptor (GR) in myeloid cells after removal of the chemical insult. While clinical symptoms and tissue damage in the colon ameliorated again in GRflox mice, the disease further aggravated in GRlysM littermates. The observed difference coincided with an increased abundance of macrophages in inflammatory infiltrates in the colon of mutant mice whereas neutrophil and T cell numbers were similar. Concomitantly, systemic IL-6 secretion and mRNA levels of pro-inflammatory cytokines in the colon were elevated in GRlysM mice and gene expression of scavenger receptors and IL-10 was diminished. Taken together, our results reveal an important role of myeloid cells as targets of GC in DSS-induced colitis and probably in IBD in humans as well.
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Affiliation(s)
- Garrit K. Meers
- Institute for Cellular and Molecular Immunology, University Medical Center Goettingen, Göttingen, Germany
| | - Hanibal Bohnenberger
- Institute of Pathology, University Medical Center Goettingen, Göttingen, Germany
| | - Holger M. Reichardt
- Institute for Cellular and Molecular Immunology, University Medical Center Goettingen, Göttingen, Germany
| | - Fred Lühder
- Institute for Multiple Sclerosis Research and Neuroimmunology, University Medical Center Goettingen, Göttingen, Germany
| | - Sybille D. Reichardt
- Institute for Cellular and Molecular Immunology, University Medical Center Goettingen, Göttingen, Germany
- * E-mail:
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Tanaka M, Nakayama J. Development of the gut microbiota in infancy and its impact on health in later life. Allergol Int 2017; 66:515-522. [PMID: 28826938 DOI: 10.1016/j.alit.2017.07.010] [Citation(s) in RCA: 334] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/12/2017] [Accepted: 07/14/2017] [Indexed: 12/17/2022] Open
Abstract
Gut microbial ecology and function are dynamic in infancy, but are stabilized in childhood. The 'new friends' have a great impact on the development of the digestive tract and host immune system. In the first year of life, especially, the gut microbiota dramatically changes through interactions with the developing immune system in the gut. The process of establishing the gut microbiota is affected by various environmental factors, with the potential to be a main determinant of life-long health. In this review, we summarize recent findings regarding gut microbiota establishment, including the importance of various factors related to the development of the immune system and allergic diseases later in life.
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Affiliation(s)
- Masaru Tanaka
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Fukuoka, Japan
| | - Jiro Nakayama
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Fukuoka, Japan.
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Intestinal macrophages in Peyer's patches, sacculus rotundus and appendix of Angora rabbit. Cell Tissue Res 2017; 370:285-295. [PMID: 28766043 DOI: 10.1007/s00441-017-2659-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Accepted: 05/30/2017] [Indexed: 12/14/2022]
Abstract
The largest pool of macrophages in the body is harboured by the intestinal mucosa. As the principal phagocytic component of the immune system, macrophages are essential for maintaining mucosal homeostasis as they prevent commensal bacteria from adhering to mucosal epithelial cells. This study provides a RAM11 immunohistochemical and electron microscopic investigation of the existence, localization and distribution of intestinal macrophages in organized gut-associated lymphoid tissue (GALT), including Peyer's patches (PPs), the sacculus rotundus (SR) and the appendix, in the Angora rabbit. Although rabbit intestinal macrophages did not express the tissue macrophage marker macrosialin (CD68), they expressed RAM11. RAM11-positive intestinal macrophages were mostly localized to the subepithelial dome region, interfollicular area and germinal centres (GCs) of the GALT and the lamina propria or submucosa of the ileum and jejunum devoid of PPs and were also observed in the follicle-associated epithelium of PPs, but not in that of the SR and appendix. RAM11-positive macrophages containing engulfed apoptotic bodies were present in the GCs of the lymphoid follicles in the GALT. Electron microscopy further revealed multiple macrophages containing apoptotic bodies within the GCs of the follicles in the GALT. Some macrophage aggregations were observed in the GC and between the GC and the corona region of the follicles in the SR and appendix. Rabbit intestinal macrophages thus undertake both potent phagocytic activity and the efficient scavenging of apoptotic cells. Immunohistochemical data suggest that RAM11 can be reliably used for the determination of intestinal macrophages in the GALT of rabbits.
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Nolte A, Junginger J, Baum B, Hewicker-Trautwein M. Heterogeneity of macrophages in canine histiocytic ulcerative colitis. Innate Immun 2017; 23:228-239. [DOI: 10.1177/1753425916686170] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Histiocytic ulcerative colitis (HUC) is a chronic enteropathy which most notably occurs in Boxer dogs and French bulldogs. The inflamed mucosa is hallmarked by large, foamy, periodic acid–Schiff (PAS)-positive macrophages infiltrating the colonic mucosa. As little is known about their origin and phenotype, an immunohistochemical study was performed using different macrophage markers. Generally, canine colonic macrophages showed high expression of ionised calcium-binding adaptor molecule 1 and MHC class II. In canine HUC, macrophages revealed up-regulation of lysozyme and L1 Ag but decreased CD163 expression compared with controls, suggesting them to be pro-inflammatory cells, whereas the healthy colonic mucosa was characterised by an anti-inflammatory macrophage phenotype. In addition, PAS reaction was used to discriminate macrophage subpopulations. PAS– macrophages displayed higher expression of L1 Ag and CD64, whereas PAS+ cells, which were only present in HUC patients, were characterised by increased expression of lysozyme, inducible nitric oxide synthase and CD204. This indicates PAS+ cells to be mature macrophages contributing to the inflammatory process, which are most likely maintained by differentiation of immature PAS– macrophages continuously recruited from blood monocytes. In summary, macrophage heterogeneity in canine HUC probably illustrates their different maturation states and functions compared with the healthy animals.
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Affiliation(s)
- Anna Nolte
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Johannes Junginger
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Berit Baum
- Vet Med Labor GmbH, Division of IDEXX Laboratories, Ludwigsburg, Germany
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Abstract
Inflammatory bowel diseases (IBDs) are thought to develop as a result of complex interactions between host genetics, the immune system and the environment including the gut microbiome. Although an improved knowledge of the immunopathogenesis of IBDs has led to great advances in therapy such as the highly effective anti-tumor necrosis factor class of medications, a significant proportion of patients with Crohn's disease and ulcerative colitis do not respond to anti-tumor necrosis factor antibodies. Further understanding of the different immune pathways involved in the genesis of chronic intestinal inflammation is required to help find effective treatments for IBDs. In this review, the role of the mucosal innate and adaptive immune system in IBD is summarized, highlighting new areas of discovery which may hold the key to identifying novel predictive or prognostic biomarkers and new avenues of therapeutic discovery.
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Abstract
Traumatic injury remains one of the most prevalent reasons for patients to be hospitalized. Burn injury accounts for 40,000 hospitalizations in the United States annually, resulting in a large burden on both the health and economic system and costing millions of dollars every year. The complications associated with postburn care can quickly cause life-threatening conditions including sepsis and multiple organ dysfunction and failure. In addition, alcohol intoxication at the time of burn injury has been shown to exacerbate these problems. One of the biggest reasons for the onset of these complications is the global suppression of the host immune system and increased susceptibility to infection. It has been hypothesized that infections after burn and other traumatic injury may stem from pathogenic bacteria from within the host's gastrointestinal tract. The intestine is the major reservoir of bacteria within the host, and many studies have demonstrated perturbations of the intestinal barrier after burn injury. This article reviews the findings of these studies as they pertain to changes in the intestinal immune system after alcohol and burn injury.
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Harusato A, Geem D, Denning TL. Macrophage Isolation from the Mouse Small and Large Intestine. Methods Mol Biol 2016; 1422:171-80. [PMID: 27246032 DOI: 10.1007/978-1-4939-3603-8_16] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Macrophages play important roles in maintaining intestinal homeostasis via their ability to orchestrate responses to the normal microbiota as well as pathogens. One of the most important steps in beginning to understand the functions of these cells is the ability to effectively isolate them from the complex intestinal environment. Here, we detail methodology for the isolation and phenotypic characterization of macrophages from the mouse small and large intestine.
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Affiliation(s)
- Akihito Harusato
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA, 30303, USA
| | - Duke Geem
- Department of Pathology & Laboratory Medicine, Emory University, Atlanta, GA, 30322, USA
| | - Timothy L Denning
- Institute for Biomedical Sciences, Georgia State University, 100 Piedmont Avenue, Room 690, Atlanta, GA, 30303, USA.
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Pinto AJW, de Amorim IFG, Pinheiro LJ, Madeira IMVM, Souza CC, Chiarini-Garcia H, Caliari MV, Tafuri WL. Glycol methacrylate embedding for the histochemical study of the gastrointestinal tract of dogs naturally infected with Leishmania infantum. Eur J Histochem 2015; 59:2546. [PMID: 26708180 PMCID: PMC4698612 DOI: 10.4081/ejh.2015.2546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/17/2015] [Indexed: 11/22/2022] Open
Abstract
In canine visceral leishmaniasis a diffuse chronic inflammatory exudate and an intense parasite load throughout the gastrointestinal tract has been previously reported. However, these studies did not allow a properly description of canine cellular morphology details. The aim of our study was to better characterize these cells in carrying out a qualitative and quantitative histological study in the gastrointestinal tract of dogs naturally infected with Leishmania infantum by examining gut tissues embedded in glycol methacrylate. Twelve infected adult dogs were classified in asymptomatic and symptomatic. Five uninfected dogs were used as controls. After necropsy, three samples of each gut segment, including esophagus, stomach, duodenum, jejunum, ileum, cecum, colon, and rectum were collected and fixed in Carnoy's solution for glycol methacrylate protocols. Sections were stained with hematoxylin-eosin, toluidine blue borate, and periodic acid-Schiff stain. Leishmania amastigotes were detected by immunohistochemistry employed in both glycol methacrylate and paraffin embedded tissues. The quantitative histological analysis showed higher numbers of plasma cells, lymphocytes and macrophages in lamina propria of all segments of GIT of infected dogs than controls. The parasite load was more intense and cecum and colon, independently of the clinical status of these dogs. Importantly, glycol methacrylate embedded tissue stained with toluidine blue borate clearly revealed mast cell morphology, even after mast cell degranulation. Infected dogs showed lower numbers of mast cells in all gut segments than did controls. Despite the glycol methacrylate (GMA) protocol requires more attention and care than the conventional paraffin processing, this embedding procedure proved to be especially suitable for the present histological study, where it allowed to preserve and observe cell morphology in fine detail.
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Flannigan KL, Geem D, Harusato A, Denning TL. Intestinal Antigen-Presenting Cells: Key Regulators of Immune Homeostasis and Inflammation. THE AMERICAN JOURNAL OF PATHOLOGY 2015; 185:1809-19. [PMID: 25976247 DOI: 10.1016/j.ajpath.2015.02.024] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 02/09/2015] [Accepted: 02/12/2015] [Indexed: 12/31/2022]
Abstract
The microbiota that populate the mammalian intestine are critical for proper host physiology, yet simultaneously pose a potential danger. Intestinal antigen-presenting cells, namely macrophages and dendritic cells (DCs), are integral components of the mucosal innate immune system that maintain co-existence with the microbiota in face of this constant threat. Intestinal macrophages and DCs integrate signals from the microenvironment to orchestrate innate and adaptive immune responses that ultimately lead to durable tolerance of the microbiota. Tolerance is not a default response, however, because macrophages and DCs remain poised to vigorously respond to pathogens that breach the epithelial barrier. In this review, we summarize the salient features of macrophages and DCs in the healthy and inflamed intestine and discuss how signals from the microbiota can influence their function.
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Affiliation(s)
- Kyle L Flannigan
- Institute for Biomedical Sciences, Center for Inflammation, Immunity, and Infection, Georgia State University, Atlanta
| | - Duke Geem
- Institute for Biomedical Sciences, Center for Inflammation, Immunity, and Infection, Georgia State University, Atlanta; Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia
| | - Akihito Harusato
- Institute for Biomedical Sciences, Center for Inflammation, Immunity, and Infection, Georgia State University, Atlanta
| | - Timothy L Denning
- Institute for Biomedical Sciences, Center for Inflammation, Immunity, and Infection, Georgia State University, Atlanta.
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McDermott AJ, Higdon KE, Muraglia R, Erb-Downward JR, Falkowski NR, McDonald RA, Young VB, Huffnagle GB. The role of Gr-1(+) cells and tumour necrosis factor-α signalling during Clostridium difficile colitis in mice. Immunology 2015; 144:704-16. [PMID: 25399934 DOI: 10.1111/imm.12425] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 10/27/2014] [Accepted: 11/03/2014] [Indexed: 02/01/2023] Open
Abstract
The host response to Clostridium difficile infection in antibiotic-treated mice is characterized by robust recruitment of Gr-1(+) cells, increased expression of inflammatory cytokines including tumour necrosis factor-α (TNF-α), and the development of severe epithelial damage. To investigate the role of Gr-1(+) cells and TNF-α during C. difficile colitis, we treated infected mice with monoclonal antibodies against Gr-1 or TNF-α. Mice were challenged with vegetative cells of C. difficile strain VPI 10463 following treatment with the third-generation cephalosporin ceftriaxone. Ceftriaxone treatment alone was associated with significant changes in cytokine expression within the colonic mucosa but not overt inflammatory histopathological changes. In comparison, C. difficile infection following ceftriaxone treatment was associated with increased expression of inflammatory cytokines and chemokines including Cxcl1, Cxcl2, Il1b, Il17f and Tnfa, as well as robust recruitment of Ly6C(Mid) Gr-1(High) neutrophils and Ly6C(High) Gr-1(Mid) monocytes and the development of severe colonic histopathology. Anti-Gr-1 antibody treatment resulted in effective depletion of both Ly6C(Mid) Gr-1(High) neutrophils and Ly6C(High) Gr-1(Mid) monocytes: however, we observed no protection from the development of severe pathology or reduction in expression of the pro-inflammatory cytokines Il1b, Il6, Il33 and Tnfa following anti-Gr-1 treatment. By contrast, anti-TNF-α treatment did not affect Gr-1(+) cell recruitment, but was associated with increased expression of Il6 and Il1b. Additionally, Ffar2, Ffar3, Tslp, Tff and Ang4 expression was significantly reduced in anti-TNF-α-treated animals, in association with marked intestinal histopathology. These studies raise the possibility that TNF-α may play a role in restraining inflammation and protecting the epithelium during C. difficile infection.
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Affiliation(s)
- Andrew J McDermott
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
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Harusato A, Flannigan KL, Geem D, Denning TL. Phenotypic and functional profiling of mouse intestinal antigen presenting cells. J Immunol Methods 2015; 421:20-26. [PMID: 25891794 DOI: 10.1016/j.jim.2015.03.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 03/21/2015] [Accepted: 03/21/2015] [Indexed: 12/29/2022]
Abstract
The microbiota that populates the mammalian intestine consists of hundreds of trillions of bacteria that are separated from underlying immune cells by a single layer of epithelial cells. The intestinal immune system effectively tolerates components of the microbiota that provide benefit to the host while remaining poised to eliminate those that are harmful. Antigen presenting cells, especially macrophages and dendritic cells, play important roles in maintaining intestinal homeostasis via their ability to orchestrate appropriate responses to the microbiota. Paramount to elucidating intestinal macrophage- and dendritic cell-mediated functions is the ability to effectively isolate and identify these cells from a complex cellular environment. In this review, we summarize methodology for the isolation and phenotypic characterization of macrophages and DCs from the mouse intestine and discuss how this may be useful for gaining insight into the mechanisms by which mucosal immune tolerance is maintained.
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Affiliation(s)
- Akihito Harusato
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303, United States
| | - Kyle L Flannigan
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303, United States
| | - Duke Geem
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303, United States; Department of Pathology & Laboratory Medicine, Emory University, Atlanta, GA 30322, United States
| | - Timothy L Denning
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303, United States.
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Brun P, Gobbo S, Caputi V, Spagnol L, Schirato G, Pasqualin M, Levorato E, Palù G, Giron MC, Castagliuolo I. Toll like receptor-2 regulates production of glial-derived neurotrophic factors in murine intestinal smooth muscle cells. Mol Cell Neurosci 2015; 68:24-35. [PMID: 25823690 DOI: 10.1016/j.mcn.2015.03.018] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 03/16/2015] [Accepted: 03/24/2015] [Indexed: 12/31/2022] Open
Abstract
Gut microbiota-innate immunity axis is emerging as a key player to guarantee the structural and functional integrity of the enteric nervous system (ENS). Alterations in the composition of the gut microbiota, derangement in signaling of innate immune receptors such as Toll-like receptors (TLRs), and modifications in the neurochemical coding of the ENS have been associated with a variety of gastrointestinal disorders. Indeed, TLR2 activation by microbial products controls the ENS structure and regulates intestinal neuromuscular function. However, the cellular populations and the molecular mechanisms shaping the plasticity of enteric neurons in response to gut microbes are largely unexplored. In this study, smooth muscle cells (SMCs), enteric glial cells (EGCs) and macrophages/dendritic cells (MΦ/DCs) were isolated and cultured from the ileal longitudinal muscle layer of wild-type (WT) and Toll-like receptor-2 deficient (TLR2(-/-)) mice. Quantification of mRNA levels of neurotrophins at baseline and following stimulation with TLR ligands was performed by RT-PCR. To determine the role of neurotrophins in supporting the neuronal phenotype, we performed co-culture experiments of enteric neurons with the conditioned media of cells isolated from the longitudinal muscle layer of WT or TLR2(-/-) mice. The neuronal phenotype was investigated evaluating the expression of βIII-tubulin, HuC/D, and nNOS by immunocytochemistry. As detected by semi-quantitative RT-PCR, SMCs expressed mRNA coding TLR1-9. Among the tested cell populations, un-stimulated SMCs were the most prominent sources of neurotrophins. Stimulation with TLR2, TLR4, TLR5 and TLR9 ligands further increased Gdnf, Ngf, Bdnf and Lif mRNA levels in SMCs. Enteric neurons isolated from TLR2(-/-) mice exhibited smaller ganglia, fewer HuC/D(+ve) and nNOS(+ve) neurons and shorter βIII-tubulin axonal networks as compared to neurons cultured from WT mice. The co-culture with the conditioned media from WT-SMCs but not with those from WT-EGCs or WT-MΦ/DCs corrected the altered neuronal phenotype of TLR2(-/-) mice. Supplementation of TLR2(-/-) neuronal cultures with GDNF recapitulated the WT-SMC co-culture effect whereas the knockdown of GDNF expression in WT-SMCs using shRNA interference abolished the effect on TLR2(-/-) neurons. These data revealed that by exploiting the repertoire of TLRs to decode gut-microbial signals, intestinal SMCs elaborate a cocktail of neurotrophic factors that in turn supports neuronal phenotype. In this view, the SMCs represent an attractive target for novel therapeutic strategies.
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Affiliation(s)
- Paola Brun
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy.
| | - Serena Gobbo
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Valentina Caputi
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Largo E. Meneghetti 2, 35131 Padova, Italy
| | - Lisa Spagnol
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Giulia Schirato
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Matteo Pasqualin
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Elia Levorato
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
| | - Maria Cecilia Giron
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Largo E. Meneghetti 2, 35131 Padova, Italy
| | - Ignazio Castagliuolo
- Department of Molecular Medicine, University of Padova, via A. Gabelli 63, 35121 Padova, Italy
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Tsang SW, Ip SP, Wu JCY, Ng SC, Yung KKL, Bian ZX. A Chinese medicinal formulation ameliorates dextran sulfate sodium-induced experimental colitis by suppressing the activity of nuclear factor-kappaB signaling. JOURNAL OF ETHNOPHARMACOLOGY 2015; 162:20-30. [PMID: 25554639 DOI: 10.1016/j.jep.2014.12.035] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 10/01/2014] [Accepted: 12/22/2014] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Inflammatory bowel disease (IBD) is generally associated with a set of debilitating symptoms including abdominal pain, tenesmus, diarrhea and bloody stool. The standard approaches for treating IBD, which are the application of pharmaceuticals, are often unsatisfactory. IBD patients may suffer from repeated relapses and even exacerbation after taking these medications. Thus, patients are increasingly seeking relief through the use of complementary and alternative medicines. AIM OF STUDY To provide scientific ground for the mode of actions of a Chinese medicinal formulation-modified ZenWu Decoction (MZWD) in ulcerative colitis. MATERIALS AND METHODS C57BL6 mice were fed with 3 cycles of 2% dextran sulfate sodium (DSS) in drinking water for the induction of chronic colitis and then given MZWD at 17.47 g/kg/day. Effects of MZWD were evaluated by histopathological and biochemical assays. RESULTS When MZWD was given, inflammatory responses namely immune-cell infiltration, elevated serum levels of pro-inflammatory cytokines and mucosal lesions were notably suppressed. Further, MZWD treatment attenuated the activation of nuclear factor-kappaB (NF-κB), the vital regulator of inflammatory cascades, while lessening the degradation of I-kappaB-alpha and reducing the activity of protease-activated receptor 2 in DSS-induced colonic tissues. Consequently, diarrhea, bloody stool and colon shortening were reduced whilst mucosal integrity was improved in MZWD-treated colitis mice. CONCLUSIONS Our findings suggest that MZWD is a potential remedy for treating IBD, and the mechanism of its efficacy is an anti-inflammatory effect associated with the suppression of the NF-κB pathway.
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Affiliation(s)
- Siu Wai Tsang
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Siu Po Ip
- School of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Justin Che-Yuen Wu
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Siew-Chien Ng
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Ken Kin-Lam Yung
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Zhao-Xiang Bian
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.
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Francino MP. Early development of the gut microbiota and immune health. Pathogens 2014; 3:769-90. [PMID: 25438024 PMCID: PMC4243441 DOI: 10.3390/pathogens3030769] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 08/29/2014] [Accepted: 09/19/2014] [Indexed: 12/13/2022] Open
Abstract
In recent years, the increase in human microbiome research brought about by the rapidly evolving “omic” technologies has established that the balance among the microbial groups present in the human gut, and their multipronged interactions with the host, are crucial for health. On the other hand, epidemiological and experimental support has also grown for the ‘early programming hypothesis’, according to which factors that act in utero and early in life program the risks for adverse health outcomes later on. The microbiota of the gut develops during infancy, in close interaction with immune development, and with extensive variability across individuals. It follows that the specific process of gut colonization and the microbe-host interactions established in an individual during this period have the potential to represent main determinants of life-long propensity to immune disease. Although much remains to be learnt on the progression of events by which the gut microbiota becomes established and initiates its intimate relationships with the host, and on the long-term repercussions of this process, recent works have advanced significatively in this direction.
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Affiliation(s)
- M Pilar Francino
- Unitat Mixta d'Investigació en Genòmica i Salut, Fundación para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat Valenciana (FISABIO)-Salud Pública/Institut Cavanilles de Biodiversitat i Biologia Evolutiva (Universitat de València), València 46020, Spain.
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Mann ER, Li X. Intestinal antigen-presenting cells in mucosal immune homeostasis: Crosstalk between dendritic cells, macrophages and B-cells. World J Gastroenterol 2014; 20:9653-9664. [PMID: 25110405 PMCID: PMC4123356 DOI: 10.3748/wjg.v20.i29.9653] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Revised: 02/26/2014] [Accepted: 04/29/2014] [Indexed: 02/06/2023] Open
Abstract
The intestinal immune system maintains a delicate balance between immunogenicity against invading pathogens and tolerance of the commensal microbiota. Inflammatory bowel disease (IBD) involves a breakdown in tolerance towards the microbiota. Dendritic cells (DC), macrophages (MΦ) and B-cells are known as professional antigen-presenting cells (APC) due to their specialization in presenting processed antigen to T-cells, and in turn shaping types of T-cell responses generated. Intestinal DC are migratory cells, unique in their ability to generate primary T-cell responses in mesenteric lymph nodes or Peyer’s patches, whilst MΦ and B-cells contribute to polarization and differentiation of secondary T-cell responses in the gut lamina propria. The antigen-sampling function of gut DC and MΦ enables them to sample bacterial antigens from the gut lumen to determine types of T-cell responses generated. The primary function of intestinal B-cells involves their secretion of large amounts of immunoglobulin A, which in turn contributes to epithelial barrier function and limits immune responses towards to microbiota. Here, we review the role of all three types of APC in intestinal immunity, both in the steady state and in inflammation, and how these cells interact with one another, as well as with the intestinal microenvironment, to shape mucosal immune responses. We describe mechanisms of maintaining intestinal immune tolerance in the steady state but also inappropriate responses of APC to components of the gut microbiota that contribute to pathology in IBD.
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Bargalló A, Abad L, Odena G, Planas R, Bartolí R. New method for isolation of rat lamina propria macrophages in colonic tissue. J Immunol Methods 2014; 408:132-6. [PMID: 24816467 DOI: 10.1016/j.jim.2014.05.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 04/29/2014] [Accepted: 05/02/2014] [Indexed: 02/04/2023]
Abstract
Studies on intestinal cells in the lamina propria are important for understanding the cellular and immune responses in the gut. There is a lack of specific isolating procedures of macrophage cells in rats. Two different procedures of macrophage isolation of the lamina propria in rats are compared: a standard mice protocol for lymphocyte isolation (A) adapted to rat samples and a new protocol developed specifically for rats (B). Significant differences are observed when analyzing the effect of the isolation method on the cell number, viability and phenotype. This has important implications when further functional studies are required.
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Affiliation(s)
- Ana Bargalló
- Gastroenterology Department, Hospital De Sant Joan Despí Moisès Broggi, Sant Joan Despí, Barcelona, Spain; Germans Trias i Pujol Foundation (IGTP), Badalona, Spain
| | - Laura Abad
- Germans Trias i Pujol Foundation (IGTP), Badalona, Spain
| | - Gemma Odena
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; CIBERehd, Ciber de Enfermedades Hepaticas y Digestivas, Barcelona, Spain; Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Ramon Planas
- CIBERehd, Ciber de Enfermedades Hepaticas y Digestivas, Barcelona, Spain; Hepatology Unit, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - Ramon Bartolí
- Germans Trias i Pujol Foundation (IGTP), Badalona, Spain; CIBERehd, Ciber de Enfermedades Hepaticas y Digestivas, Barcelona, Spain.
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Schiwon M, Weisheit C, Franken L, Gutweiler S, Dixit A, Meyer-Schwesinger C, Pohl JM, Maurice NJ, Thiebes S, Lorenz K, Quast T, Fuhrmann M, Baumgarten G, Lohse MJ, Opdenakker G, Bernhagen J, Bucala R, Panzer U, Kolanus W, Gröne HJ, Garbi N, Kastenmüller W, Knolle PA, Kurts C, Engel DR. Crosstalk between sentinel and helper macrophages permits neutrophil migration into infected uroepithelium. Cell 2014; 156:456-68. [PMID: 24485454 DOI: 10.1016/j.cell.2014.01.006] [Citation(s) in RCA: 170] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 10/21/2013] [Accepted: 01/06/2014] [Indexed: 12/16/2022]
Abstract
The phagocytes of the innate immune system, macrophages and neutrophils, contribute to antibacterial defense, but their functional specialization and cooperation is unclear. Here, we report that three distinct phagocyte subsets play highly coordinated roles in bacterial urinary tract infection. Ly6C(-) macrophages acted as tissue-resident sentinels that attracted circulating neutrophils and Ly6C(+) macrophages. Such Ly6C(+) macrophages played a previously undescribed helper role: once recruited to the site of infection, they produced the cytokine TNF, which caused Ly6C(-) macrophages to secrete CXCL2. This chemokine activated matrix metalloproteinase-9 in neutrophils, allowing their entry into the uroepithelium to combat the bacteria. In summary, the sentinel macrophages elicit the powerful antibacterial functions of neutrophils only after confirmation by the helper macrophages, reminiscent of the licensing role of helper T cells in antiviral adaptive immunity. These findings identify helper macrophages and TNF as critical regulators in innate immunity against bacterial infections in epithelia.
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Affiliation(s)
- Marzena Schiwon
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Christina Weisheit
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany; Clinic for Anesthesiology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Lars Franken
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Sebastian Gutweiler
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Akanksha Dixit
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | | | - Judith-Mira Pohl
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Nicholas J Maurice
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Stephanie Thiebes
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Kristina Lorenz
- Institute of Pharmacology and Toxicology, University of Würzburg, 97078 Würzburg, Germany
| | - Thomas Quast
- Life and Medical Sciences Institute, Friedrich-Wilhelms-Universität, 53115 Bonn, Germany
| | - Martin Fuhrmann
- German Center for Neurodegenerative Diseases (DZNE), 53125 Bonn, Germany
| | - Georg Baumgarten
- Clinic for Anesthesiology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Martin J Lohse
- Institute of Pharmacology and Toxicology, University of Würzburg, 97078 Würzburg, Germany
| | - Ghislain Opdenakker
- Laboratory of Immunobiology, Rega Institute for Medical Research, University of Leuven, 3000 KU Leuven, Belgium
| | - Jürgen Bernhagen
- Institute of Biochemistry and Molecular Cell Biology, RWTH Aachen University, 52062 Aachen, Germany
| | - Rick Bucala
- Yale University School of Medicine, New Haven, CT 06510, USA
| | - Ulf Panzer
- Medizinische Klinik III, University Clinic Hamburg Eppendorf, 20246 Hamburg, Germany
| | - Waldemar Kolanus
- Life and Medical Sciences Institute, Friedrich-Wilhelms-Universität, 53115 Bonn, Germany
| | - Hermann-Josef Gröne
- Cellular and Molecular Pathology, German Cancer Research Center Heidelberg, 69120 Heidelberg, Germany
| | - Natalio Garbi
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Wolfgang Kastenmüller
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Percy A Knolle
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany
| | - Christian Kurts
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany.
| | - Daniel R Engel
- Institute of Experimental Immunology, University Clinic of Bonn, 53127 Bonn, Germany.
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Lu N, Wang L, Cao H, Liu L, Van Kaer L, Washington MK, Rosen MJ, Dubé PE, Wilson KT, Ren X, Hao X, Polk DB, Yan F. Activation of the epidermal growth factor receptor in macrophages regulates cytokine production and experimental colitis. THE JOURNAL OF IMMUNOLOGY 2014; 192:1013-23. [PMID: 24391216 DOI: 10.4049/jimmunol.1300133] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Macrophages regulate innate immunity to maintain intestinal homeostasis and play pathological roles in intestinal inflammation. Activation of the epidermal growth factor receptor (EGFR) promotes cellular proliferation, differentiation, survival, and wound closure in several cell types. However, the impact of EGFR in macrophages remains unclear. This study was to investigate whether EGFR activation in macrophages regulates cytokine production and intestinal inflammation. We found that EGFR was activated in colonic macrophages in mice with dextran sulfate sodium (DSS)-induced colitis and in patients with ulcerative colitis. DSS-induced acute colitis was ameliorated, and recovery from colitis was promoted in Egfr(fl/fl)LysM-Cre mice with myeloid cell-specific deletion of EGFR, compared with LysM-Cre mice. DSS treatment increased IL-10 and TNF levels during the acute phase of colitis, and increased IL-10 but reduced TNF levels during the recovery phase in Egfr(fl/fl)LysM-Cre mice. An anti-IL-10 neutralizing Ab abolished these effects of macrophage-specific EGFR deletion on DSS-induced colitis in Egfr(fl/fl)LysM-Cre mice. LPS stimulated EGFR activation and inhibition of EGFR kinase activity enhanced LPS-stimulated NF-κB activation in RAW 264.7 macrophages. Furthermore, induction of IL-10 production by EGFR kinase-blocked RAW 264.7 cells, in response to LPS plus IFN-γ, correlated with decreased TNF production. Thus, although selective deletion of EGFR in macrophages leads to increases in both pro- and anti-inflammatory cytokines in response to inflammatory stimuli, the increase in the IL-10 level plays a role in suppressing proinflammatory cytokine production, resulting in protection of mice from intestinal inflammation. These results reveal an integrated response of macrophages regulated by EGFR in intestinal inflammatory disorders.
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Affiliation(s)
- Ning Lu
- Department of Breast Cancer Medical Oncology, Key Laboratory of Breast Cancer Prevention and Therapy, Ministry of Education, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin 300060, P. R. China
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Figueiredo MM, Amorim IFG, Pinto AJW, Barbosa VS, Pinheiro LDJ, Deoti B, Faria AMC, Tafuri WL. Expression of Toll-like receptors 2 and 9 in cells of dog jejunum and colon naturally infected with Leishmania infantum. BMC Immunol 2013; 14:22. [PMID: 23668673 PMCID: PMC3698031 DOI: 10.1186/1471-2172-14-22] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Accepted: 04/30/2013] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Infection with parasite protozoa is a long-term health issue in tropical and subtropical regions throughout the world. The Toll-like receptor (TLR) signaling pathway is one of the first-responding defense systems against Leishmania. The aim of this study was to investigate the expression of TLR2 and TLR9 in jejunum and colon and its correlation with CD11c, CD11b, and CD14 receptors used as markers for dendritic cells and macrophages. METHODS Twenty four dogs infected with Leishmania infantum were used in this study. Cytometry was carried out in lamina propria cells from jejunum and colon using markers for TLR2, TLR9, CD11b, CD11c and CD14. RESULTS Cellular inflammatory exudate was diffuse in the mucosa and submucosa, predominately comprising mononuclear cells: plasma cells, macrophages, and lymphocytes. Despite the parasite load, microscopy showed no erosion was evident in the epithelial mucosa layers. The colon harbored more parasites than the jejunum. Flow cytometry revealed higher frequency of TLR2+ and CD11c+ dendritic cells in the colon than in the jejunum. Conversely, TLR9-expressing cells were more frequent in jejunum. Moreover, frequency of macrophages (CD11b+ and CD14+) expressing simultaneity TLR9 were lower in the colon than in jejunum, while CD11c+ cells predominated in the colon. Despite of the negative ELISA serum results, IL-10 and TNF-α were higher in jejunum than colon of infected animals. However, IL-4 was higher in colon than jejunum of infected animals. A higher expression these cytokines were demonstrated in infected dogs compared to uninfected dogs. CONCLUSIONS There was no correlation between clinical signs and pathological changes and immunological and parasitological findings in the gastrointestinal tract in canine visceral leishmaniasis. However, jejunum showed a lower parasite load with increased frequency and expression of CD11b, TLR9, CD14/CD11b/TLR9 receptors and IL-10 and TNF-α cytokines. Conversely, the colon showed a higher parasite load along with increased frequency and expression of TLR2, CD11c receptors, and IL-4 cytokine. Thus, Leishmania infantum is able to interfere in jejunum increased expression of TLR2, TLR9, CD11b, CD14, CD14/CD11b/TLR9 receptors, IL-10, and TNF-α; and in colon increased expression of CD11c, TLR2, TLR9, CD11b, CD14 e, CD14/CD11b/TLR9 receptors, IL-10, and TNF-α.
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Affiliation(s)
- Maria M Figueiredo
- Departamento de Patologia Geral, Faculdade de Medicina, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, Minas Gerais, Brazil
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Yang Z, Grinchuk V, Urban JF, Bohl J, Sun R, Notari L, Yan S, Ramalingam T, Keegan AD, Wynn TA, Shea-Donohue T, Zhao A. Macrophages as IL-25/IL-33-responsive cells play an important role in the induction of type 2 immunity. PLoS One 2013; 8:e59441. [PMID: 23536877 PMCID: PMC3607614 DOI: 10.1371/journal.pone.0059441] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 02/14/2013] [Indexed: 02/07/2023] Open
Abstract
Type 2 immunity is essential for host protection against nematode infection but is detrimental in allergic inflammation or asthma. There is a major research focus on the effector molecules and specific cell types involved in the initiation of type 2 immunity. Recent work has implicated an important role of epithelial-derived cytokines, IL-25 and IL-33, acting on innate immune cells that are believed to be the initial sources of type 2 cytokines IL-4/IL-5/IL-13. The identities of the cell types that mediate the effects of IL-25/IL-33, however, remain to be fully elucidated. In the present study, we demonstrate that macrophages as IL-25/IL-33-responsive cells play an important role in inducing type 2 immunity using both in vitro and in vivo approaches. Macrophages produced type 2 cytokines IL-5 and IL-13 in response to the stimulation of IL-25/IL-33 in vitro, or were the IL-13-producing cells in mice administrated with exogenous IL-33 or infected with Heligmosomoides bakeri. In addition, IL-33 induced alternative activation of macrophages primarily through autocrine IL-13 activating the IL-4Rα-STAT6 pathway. Moreover, depletion of macrophages attenuated the IL-25/IL-33-induced type 2 immunity in mice, while adoptive transfer of IL-33-activated macrophages into mice with a chronic Heligmosomoides bakeri infection induced worm expulsion accompanied by a potent type 2 protective immune response. Thus, macrophages represent a unique population of the innate immune cells pivotal to type 2 immunity and a potential therapeutic target in controlling type 2 immunity-mediated inflammatory pathologies.
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Affiliation(s)
- Zhonghan Yang
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- Department of Biochemistry, Zhongshan Medical School, Sun Yat-sen University, Guangzhou, China
| | - Viktoriya Grinchuk
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Joseph F. Urban
- U.S. Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Diet, Genomics, and Immunology Laboratory, Beltsville, Maryland, United States of America
| | - Jennifer Bohl
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Rex Sun
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Luigi Notari
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Shu Yan
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Thirumalai Ramalingam
- Division of Parasitology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Achsah D. Keegan
- Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Thomas A. Wynn
- Division of Parasitology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Terez Shea-Donohue
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Aiping Zhao
- Department of Medicine and the Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
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Dendritic cell-specific intercellular adhesion molecule-3 grabbing nonintegrin mediates HIV-1 infection of and transmission by M2a-polarized macrophages in vitro. AIDS 2013; 27:707-16. [PMID: 23211775 DOI: 10.1097/qad.0b013e32835cfc82] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
OBJECTIVE To assess in-vitro effects of monocyte-derived macrophage (MDM) polarization into M1 and M2a cells on HIV-1 replication and transmission and obtain new insights into the potential importance of macrophage polarization in vivo. DESIGN Human peripheral blood monocytes were differentiated into MDM for 7 days. Control and MDM polarized into M1 or M2a cells were exposed to different strains of HIV-1 and assessed for their ability to bind and transmit virus to CD4 T lymphocytes. METHODS MDM were incubated with either tumour necrosis factor-alpha (TNF-α) along with interferon-gamma (IFN-γ) or with interleukin-4 (IL-4) for 18 h to obtain M1 or M2a cells, respectively. Expression of cell surface antigens, including CD4 and dendritic cell-specific intercellular adhesion molecule-3 grabbing nonintegrin (DC-SIGN), was evaluated by flow cytometry. C-C chemokine receptor type 5 (CCR5)-dependent (R5) HIV-1 binding, DNA synthesis and viral replication were assessed in the presence or absence of anti-DC-SIGN blocking mAbs. Transmission of C-X-C chemokine receptor type 4 (CXCR4)-dependent (X4) and R5 HIV-1 from MDM to IL-2 activated CD4 T cells was also investigated. RESULTS DC-SIGN was strongly upregulated on M2a-MDM and downregulated on M1-MDM compared with control MDM. DC-SIGN facilitated HIV-1 entry and DNA synthesis in M2a-MDM, compensating for their low levels of CD4 cell expression. M2a-MDM efficiently transmitted both R5 and X4 HIV-1 to CD4 T cells in a DC-SIGN-dependent manner. CONCLUSION DC-SIGN facilitates HIV-1 infection of M2a-MDM, and HIV-1 transfer from M2a-MDM to CD4 T cells. M2a-polarized tissue macrophages may play an important role in the capture and spread of HIV-1 in mucosal tissues and placenta.
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Freeman TC, Ivens A, Baillie JK, Beraldi D, Barnett MW, Dorward D, Downing A, Fairbairn L, Kapetanovic R, Raza S, Tomoiu A, Alberio R, Wu C, Su AI, Summers KM, Tuggle CK, Archibald AL, Hume DA. A gene expression atlas of the domestic pig. BMC Biol 2012; 10:90. [PMID: 23153189 PMCID: PMC3814290 DOI: 10.1186/1741-7007-10-90] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 10/23/2012] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND This work describes the first genome-wide analysis of the transcriptional landscape of the pig. A new porcine Affymetrix expression array was designed in order to provide comprehensive coverage of the known pig transcriptome. The new array was used to generate a genome-wide expression atlas of pig tissues derived from 62 tissue/cell types. These data were subjected to network correlation analysis and clustering. RESULTS The analysis presented here provides a detailed functional clustering of the pig transcriptome where transcripts are grouped according to their expression pattern, so one can infer the function of an uncharacterized gene from the company it keeps and the locations in which it is expressed. We describe the overall transcriptional signatures present in the tissue atlas, where possible assigning those signatures to specific cell populations or pathways. In particular, we discuss the expression signatures associated with the gastrointestinal tract, an organ that was sampled at 15 sites along its length and whose biology in the pig is similar to human. We identify sets of genes that define specialized cellular compartments and region-specific digestive functions. Finally, we performed a network analysis of the transcription factors expressed in the gastrointestinal tract and demonstrate how they sub-divide into functional groups that may control cellular gastrointestinal development. CONCLUSIONS As an important livestock animal with a physiology that is more similar than mouse to man, we provide a major new resource for understanding gene expression with respect to the known physiology of mammalian tissues and cells. The data and analyses are available on the websites http://biogps.org and http://www.macrophages.com/pig-atlas.
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Affiliation(s)
- Tom C Freeman
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Alasdair Ivens
- Fios Genomics Ltd, ETTC, King's Buildings, Edinburgh EH9 3JL UK,Centre for Immunity, Infection and Evolution, University of Edinburgh Ashworth
Labs, King's Buildings, West Mains Road, Edinburgh EH9 3JT
| | - J Kenneth Baillie
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Dario Beraldi
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK,Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Robinson
way, Cambridge, CB2 0RE, UK
| | - Mark W Barnett
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - David Dorward
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Alison Downing
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Lynsey Fairbairn
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Ronan Kapetanovic
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Sobia Raza
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Andru Tomoiu
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - Ramiro Alberio
- Division of Animal Sciences, School of Biosciences, University of Nottingham,
Sutton Bonington, Leicestershire LE12 5RD UK
| | - Chunlei Wu
- Department of Molecular and Experimental Medicine, The Scripps Research Institute,
MEM-216, 10550 North Torrey Pines Road, La Jolla, CA 92037 USA
| | - Andrew I Su
- Department of Molecular and Experimental Medicine, The Scripps Research Institute,
MEM-216, 10550 North Torrey Pines Road, La Jolla, CA 92037 USA
| | - Kim M Summers
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | | | - Alan L Archibald
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
| | - David A Hume
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of
Edinburgh, Easter Bush, EH25 9PS, UK
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Jensen AL, Collins J, Shipman EP, Wira CR, Guyre PM, Pioli PA. A subset of human uterine endometrial macrophages is alternatively activated. Am J Reprod Immunol 2012; 68:374-86. [PMID: 22882270 DOI: 10.1111/j.1600-0897.2012.01181.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 07/02/2012] [Indexed: 01/04/2023] Open
Abstract
PROBLEM Human uterine macrophages must maintain an environment hospitable to implantation and pregnancy and simultaneously provide protection against pathogens. Although macrophages comprise a significant portion of leukocytes within the uterine endometrium, the activation profile and functional response of these cells to endotoxin are unknown. METHOD OF STUDY Flow cytometric analysis of surface receptors and intracellular markers expressed by macrophages isolated from human endometria was performed. Uterine macrophages were stimulated with LPS. Cytokines, chemokines, and growth factors expressed by these cells were analyzed using Bio-Plex analysis. RESULTS CD163(high) human endometrial macrophages constitutively secrete both pro- and anti-inflammatory cytokines as well as pro-angiogenic factors and secretion of these factors is LPS-inducible. CONCLUSION A major population of human uterine macrophages is alternatively activated. These cells secrete factors in response to LPS that are involved in the activation of immune responses and tissue homeostasis.
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Affiliation(s)
- Amy L Jensen
- Department of Physiology and Neurobiology, Geisel School of Medicine at Dartmouth, Lebanon, NH, USA
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49
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Anti-Inflammatory Activities of a Chinese Herbal Formula IBS-20 In Vitro and In Vivo. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2012; 2012:491496. [PMID: 22461841 PMCID: PMC3296463 DOI: 10.1155/2012/491496] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 12/02/2011] [Accepted: 12/04/2011] [Indexed: 12/22/2022]
Abstract
Irritable bowel syndrome (IBS) is a functional bowel disorder and the etiology is not well understood. Currently there is no cure for IBS and no existing medication induces symptom relief in all patients. IBS-20 is a 20-herb Chinese medicinal formula that offers beneficial effects in patients with IBS; however, the underlying mechanisms are largely unknown. This study showed that IBS-20 potently inhibited LPS- or IFNΓ-stimulated expression of pro-inflammatory cytokines, as well as classically activated macrophage marker nitric oxide synthase 2. Similarly, IBS-20 or the component herb Coptis chinensis decreased LPS-stimulated pro-inflammatory cytokine secretion from JAWS II dendritic cells. IBS-20 or the component herbs also blocked or attenuated the IFNΓ-induced drop in transepithelial electric resistance, an index of permeability, in fully differentiated Caco-2 monolayer. Finally, the up-regulation of key inflammatory cytokines in inflamed colon from TNBS-treated mice was suppressed significantly by orally administrated IBS-20, including IFNΓ and IL-12p40. These data indicate that the anti-inflammatory activities of IBS-20 may contribute to the beneficial effects of the herbal extract in patients with IBS, providing a potential mechanism of action for IBS-20. In addition, IBS-20 may be a potential therapeutic agent against other Th1-dominant gut pathologies such as inflammatory bowel disease.
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50
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Habil N, Al-Murrani W, Beal J, Foey A. Probiotic bacterial strains differentially modulate macrophage cytokine production in a strain-dependent and cell subset-specific manner. Benef Microbes 2011; 2:283-93. [DOI: 10.3920/bm2011.0027] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Gut mucosal macrophages play a pivotal role in driving mucosal immune responses, resulting in either activation of inflammatory immune responses to pathogenic challenge or tolerance to beneficial luminal contents such as food and commensal bacteria. Macrophage responses elicited are dependent on tissue environment and the resulting cell subset, where homeostatic macrophages resemble the M2 macrophage subset and inflammatory macrophages resemble M1s. Probiotics can modulate macrophage function with outcome dependent on subset present. Using a THP-1 monocyte cell line-derived model of CD14high/low M1 and M2 macrophages, the aim of this study was to investigate the immunomodulatory effects of a panel of heat-killed probiotic bacteria and their secreted proteins on the subset-specific inflammatory marker profile of TNFα, IL-6 and NFκB. M1 and M2 cells were generated by differentiation of monocyte stable transfectants for high and low CD14 expression with phorbol 12-myristate 13-acetate and vitamin D3, respectively, where the resulting CD14lo M2 and CD14hi M1s mimicked homeostatic and inflammatory mucosal macrophages. Subsets were stimulated by enteropathic lipopolysaccharides in the presence or absence of heat-killed (HK) or secreted proteins (SP) from a panel of probiotic bacteria. Regulation of cytokine expression was measured by ELISA and NFκB activity by reporter assay. HK probiotics suppress CD14lo and augment CD14hi M1 and M2 production of TNFα whereas SPs augmented CD14hi M1 TNFα and were generally suppressive in the other subtypes. M2 macrophage IL-6 production was suppressed by both HK and SPs and differentially regulated in CD14lo and CD14hi M1s. NFκB activation failed to parallel the regulatory profiles for TNFα and IL-6 which is suggestive of probiotic bacteria exerting their regulatory effects on these cytokines in an NFκB-independent manner. In conclusion, HK and SP probiotics differentially regulate macrophage cytokines and NFκB activation in a subset-dependent manner and suggest a cautionary approach to probiotic treatment of mucosal inflammation.
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Affiliation(s)
- N. Habil
- School of Biomedical and Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
| | - W. Al-Murrani
- School of Biomedical and Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
| | - J. Beal
- School of Biomedical and Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
| | - A. Foey
- School of Biomedical and Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
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