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Andresen AMS, Taylor RS, Grimholt U, Daniels RR, Sun J, Dobie R, Henderson NC, Martin SAM, Macqueen DJ, Fosse JH. Mapping the cellular landscape of Atlantic salmon head kidney by single cell and single nucleus transcriptomics. FISH & SHELLFISH IMMUNOLOGY 2024; 146:109357. [PMID: 38181891 DOI: 10.1016/j.fsi.2024.109357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/19/2023] [Accepted: 12/21/2023] [Indexed: 01/07/2024]
Abstract
Single-cell transcriptomics is the current gold standard for global gene expression profiling, not only in mammals and model species, but also in non-model fish species. This is a rapidly expanding field, creating a deeper understanding of tissue heterogeneity and the distinct functions of individual cells, making it possible to explore the complexities of immunology and gene expression on a highly resolved level. In this study, we compared two single cell transcriptomic approaches to investigate cellular heterogeneity within the head kidney of healthy farmed Atlantic salmon (Salmo salar). We compared 14,149 cell transcriptomes assayed by single cell RNA-seq (scRNA-seq) with 18,067 nuclei transcriptomes captured by single nucleus RNA-Seq (snRNA-seq). Both approaches detected eight major cell populations in common: granulocytes, heamatopoietic stem cells, erythrocytes, mononuclear phagocytes, thrombocytes, B cells, NK-like cells, and T cells. Four additional cell types, endothelial, epithelial, interrenal, and mesenchymal cells, were detected in the snRNA-seq dataset, but appeared to be lost during preparation of the single cell suspension submitted for scRNA-seq library generation. We identified additional heterogeneity and subpopulations within the B cells, T cells, and endothelial cells, and revealed developmental trajectories of heamatopoietic stem cells into differentiated granulocyte and mononuclear phagocyte populations. Gene expression profiles of B cell subtypes revealed distinct IgM and IgT-skewed resting B cell lineages and provided insights into the regulation of B cell lymphopoiesis. The analysis revealed eleven T cell sub-populations, displaying a level of T cell heterogeneity in salmon head kidney comparable to that observed in mammals, including distinct subsets of cd4/cd8-negative T cells, such as tcrγ positive, progenitor-like, and cytotoxic cells. Although snRNA-seq and scRNA-seq were both useful to resolve cell type-specific expression in the Atlantic salmon head kidney, the snRNA-seq pipeline was overall more robust in identifying several cell types and subpopulations. While scRNA-seq displayed higher levels of ribosomal and mitochondrial genes, snRNA-seq captured more transcription factor genes. However, only scRNA-seq-generated data was useful for cell trajectory inference within the myeloid lineage. In conclusion, this study systematically outlines the relative merits of scRNA-seq and snRNA-seq in Atlantic salmon, enhances understanding of teleost immune cell lineages, and provides a comprehensive list of markers for identifying major cell populations in the head kidney with significant immune relevance.
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Affiliation(s)
| | - Richard S Taylor
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, United Kingdom
| | | | - Rose Ruiz Daniels
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, United Kingdom
| | - Jianxuan Sun
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, United Kingdom
| | - Ross Dobie
- Centre for Inflammation Research, The Queen's Medical Research Institute, Edinburgh BioQuarter, University of Edinburgh, Edinburgh, United Kingdom
| | - Neil C Henderson
- Centre for Inflammation Research, The Queen's Medical Research Institute, Edinburgh BioQuarter, University of Edinburgh, Edinburgh, United Kingdom; MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, United Kingdom
| | - Samuel A M Martin
- Scottish Fish Immunology Research Centre, School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Daniel J Macqueen
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, United Kingdom.
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2
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I Kutyavin V, Korn LL, Medzhitov R. Nutrient-derived signals regulate eosinophil adaptation to the small intestine. Proc Natl Acad Sci U S A 2024; 121:e2316446121. [PMID: 38271336 PMCID: PMC10835075 DOI: 10.1073/pnas.2316446121] [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: 09/21/2023] [Accepted: 12/05/2023] [Indexed: 01/27/2024] Open
Abstract
Eosinophils are well recognized as effector cells of type 2 immunity, yet they also accumulate in many tissues under homeostatic conditions. However, the processes that govern homeostatic eosinophil accumulation and tissue-specific adaptation, and their functional significance, remain poorly defined. Here, we investigated how eosinophils adapt to the small intestine (SI) microenvironment and the local signals that regulate this process. We observed that eosinophils gradually migrate along the crypt-villus axis, giving rise to a villus-resident subpopulation with a distinct transcriptional signature. Retinoic acid signaling was specifically required for maintenance of this subpopulation, while IL-5 was largely dispensable outside of its canonical role in eosinophil production. Surprisingly, we found that a high-protein diet suppressed the accumulation of villus-resident eosinophils. Purified amino acids were sufficient for this effect, which was a consequence of accelerated eosinophil turnover within the tissue microenvironment and was not due to altered development in the bone marrow. Our study provides insight into the process of eosinophil adaptation to the SI, highlighting its reliance on nutrient-derived signals.
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Affiliation(s)
- Vassily I Kutyavin
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Lisa L Korn
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
- Department of Medicine (Rheumatology), Yale University School of Medicine, New Haven, CT 06510
| | - Ruslan Medzhitov
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
- HHMI, Yale University School of Medicine, New Haven, CT 06510
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3
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Bernier-Latmani J, González-Loyola A, Petrova TV. Mechanisms and functions of intestinal vascular specialization. J Exp Med 2024; 221:e20222008. [PMID: 38051275 PMCID: PMC10697212 DOI: 10.1084/jem.20222008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/10/2023] [Accepted: 11/15/2023] [Indexed: 12/07/2023] Open
Abstract
The intestinal vasculature has been studied for the last 100 years, and its essential role in absorbing and distributing ingested nutrients is well known. Recently, fascinating new insights into the organization, molecular mechanisms, and functions of intestinal vessels have emerged. These include maintenance of intestinal epithelial cell function, coping with microbiota-induced inflammatory pressure, recruiting gut-specific immune cells, and crosstalk with other organs. Intestinal function is also regulated at the systemic and cellular levels, such that the postprandial hyperemic response can direct up to 30% of systemic blood to gut vessels, while micron-sized endothelial cell fenestrations are necessary for nutrient uptake. In this review, we will highlight past discoveries made about intestinal vasculature in the context of new findings of molecular mechanisms underpinning gut function. Such comprehensive understanding of the system will pave the way to breakthroughs in nutrient uptake optimization, drug delivery efficiency, and treatment of human diseases.
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Affiliation(s)
- Jeremiah Bernier-Latmani
- Department of Oncology, University of Lausanne and Ludwig Institute for Cancer Research Lausanne, Lausanne, Switzerland
| | | | - Tatiana V. Petrova
- Department of Oncology, University of Lausanne and Ludwig Institute for Cancer Research Lausanne, Lausanne, Switzerland
- Swiss Institute for Experimental Cancer Research, School of Life Sciences, École polytechnique fédérale de Lausanne, Lausanne, Switzerland
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4
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Pan X, Wang C, Zhan Y, Chen J, Wang Z, Lan R, Chen J, Zhang W, Chen C, Zhang M, Huang F, Hong J. A Subset of Breg Cells, B10, Contributes to the Development of Radiation-Induced Pulmonary Fibrosis. Int J Radiat Oncol Biol Phys 2023; 117:237-251. [PMID: 37054996 DOI: 10.1016/j.ijrobp.2023.03.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 03/07/2023] [Accepted: 03/30/2023] [Indexed: 04/15/2023]
Abstract
PURPOSE Radiation-induced pulmonary fibrosis (RIPF) is a serious side effect of radiation therapy, but the underlying mechanisms are unknown. B10 cells, as negative B regulatory cells, play important roles in regulating inflammation and autoimmunity. However, the role of B10 cells in RIPF progression is unclear. The aim of this study was to determine the role of B10 cells in aggravating RIPF and the underlying mechanism. METHODS AND MATERIALS The role of B10 cells in RIPF was studied by constructing mouse models of RIPF and depleting B10 cells with an anti-CD22 antibody. The mechanism of B10 cells in RIPF was further explored through cocultivation of B10 cells and MLE-12 or NIH3T3 cells and administration of an interleukin (IL)-10 antibody to block IL-10. RESULTS B10 cell numbers increased significantly during the early stage in the RIPF mouse models compared with the controls. In addition, depleting B10 cells with the anti-CD22 antibody attenuated the development of lung fibrosis in mice. Subsequently, we confirmed that B10 cells induced epithelial-mesenchymal transition and the transformation of myofibroblasts via activation of STAT3 signaling in vitro. After blockade of IL-10, it was verified that IL-10 secreted by B10 cells mediates the epithelial-mesenchymal transition of myofibroblasts, thereby promoting RIPF. CONCLUSIONS Our study uncovers a novel role for IL-10-secreting B10 cells that could be a new target of research for relieving RIPF.
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Affiliation(s)
- Xiaoxian Pan
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China
| | - Caihong Wang
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China
| | - Yuping Zhan
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China
| | - Jinmei Chen
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China; Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China
| | - Zeng Wang
- Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China; Central Lab, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
| | - Ruilong Lan
- Provincial Key Laboratory of Precision Medicine for Cancer, Fuzhou 350005, China; Central Lab, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
| | - Junying Chen
- Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China; Central Lab, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
| | - Weijian Zhang
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China; Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China
| | - Chun Chen
- School of Pharmacy, Fujian Medical University, Fuzhou 350122, China
| | - Mingwei Zhang
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China; Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China
| | - Fei Huang
- Provincial Key Laboratory of Precision Medicine for Cancer, Fuzhou 350005, China; Central Lab, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China.
| | - Jinsheng Hong
- Department of Radiotherapy, Cancer Center, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; Department of Radiotherapy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical Universisty, Fuzhou 350212, China; Key Laboratory of Radiation Biology of Fujian higher education institutions, The First Affiliated Hospital, Fujian Medical University, Fuzhou 350005, China.
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5
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Gurtner A, Crepaz D, Arnold IC. Emerging functions of tissue-resident eosinophils. J Exp Med 2023; 220:e20221435. [PMID: 37326974 PMCID: PMC10276195 DOI: 10.1084/jem.20221435] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/12/2023] [Accepted: 05/25/2023] [Indexed: 06/17/2023] Open
Abstract
Eosinophils are typically considered tissue-damaging effector cells in type 2 immune-related diseases. However, they are also increasingly recognized as important modulators of various homeostatic processes, suggesting they retain the ability to adapt their function to different tissue contexts. In this review, we discuss recent progress in our understanding of eosinophil activities within tissues, with particular emphasis on the gastrointestinal tract, where a large population of these cells resides under non-inflammatory conditions. We further examine evidence of their transcriptional and functional heterogeneity and highlight environmental signals emerging as key regulators of their activities, beyond classical type 2 cytokines.
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Affiliation(s)
- Alessandra Gurtner
- Institute of Experimental Immunology, University of Zürich , Zürich, Switzerland
| | - Daniel Crepaz
- Institute of Experimental Immunology, University of Zürich , Zürich, Switzerland
| | - Isabelle C Arnold
- Institute of Experimental Immunology, University of Zürich , Zürich, Switzerland
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6
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Rehman S, Gora AH, Abdelhafiz Y, Dias J, Pierre R, Meynen K, Fernandes JMO, Sørensen M, Brugman S, Kiron V. Potential of algae-derived alginate oligosaccharides and β-glucan to counter inflammation in adult zebrafish intestine. Front Immunol 2023; 14:1183701. [PMID: 37275890 PMCID: PMC10235609 DOI: 10.3389/fimmu.2023.1183701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 04/18/2023] [Indexed: 06/07/2023] Open
Abstract
Alginate oligosaccharides (AOS) are natural bioactive compounds with anti-inflammatory properties. We performed a feeding trial employing a zebrafish (Danio rerio) model of soybean-induced intestinal inflammation. Five groups of fish were fed different diets: a control (CT) diet, a soybean meal (SBM) diet, a soybean meal+β-glucan (BG) diet and 2 soybean meal+AOS diets (alginate products differing in the content of low molecular weight fractions - AL, with 31% < 3kDa and AH, with 3% < 3kDa). We analyzed the intestinal transcriptomic and plasma metabolomic profiles of the study groups. In addition, we assessed the expression of inflammatory marker genes and histological alterations in the intestine. Dietary algal β-(1, 3)-glucan and AOS were able to bring the expression of certain inflammatory genes altered by dietary SBM to a level similar to that in the control group. Intestinal transcriptomic analysis indicated that dietary SBM changed the expression of genes linked to inflammation, endoplasmic reticulum, reproduction and cell motility. The AL diet suppressed the expression of genes related to complement activation, inflammatory and humoral response, which can likely have an inflammation alleviation effect. On the other hand, the AH diet reduced the expression of genes, causing an enrichment of negative regulation of immune system process. The BG diet suppressed several immune genes linked to the endopeptidase activity and proteolysis. The plasma metabolomic profile further revealed that dietary SBM can alter inflammation-linked metabolites such as itaconic acid, taurochenodeoxycholic acid and enriched the arginine biosynthesis pathway. The diet AL helped in elevating one of the short chain fatty acids, namely 2-hydroxybutyric acid while the BG diet increased the abundance of a vitamin, pantothenic acid. Histological evaluation revealed the advantage of the AL diet: it increased the goblet cell number and length of villi of the intestinal mucosa. Overall, our results indicate that dietary AOS with an appropriate amount of < 3kDa can stall the inflammatory responses in zebrafish.
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Affiliation(s)
- Saima Rehman
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | - Adnan H. Gora
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | - Yousri Abdelhafiz
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | | | - Ronan Pierre
- CEVA (Centre d’Etude et de Valorisation des Algues), Pleubian, France
| | - Koen Meynen
- Kemin Aquascience, Division of Kemin Europa N.V., Herentals, Belgium
| | | | - Mette Sørensen
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | - Sylvia Brugman
- Animal Sciences Group, Host Microbe Interactomics, Wageningen University and Research, Wageningen, Netherlands
| | - Viswanath Kiron
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
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7
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Prescher H, Schweizer A, Frank M, Kuhfeldt E, Ring J, Nitschke L. Targeting Human CD22/Siglec-2 with Dimeric Sialosides as Novel Oligosaccharide Mimetics. J Med Chem 2022; 65:10588-10610. [PMID: 35881556 DOI: 10.1021/acs.jmedchem.2c00765] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Significant interest in the development of high-affinity ligands for Siglecs exists due to the various therapeutically relevant functions of these proteins. Here, we report a new strategy to develop and design Siglec ligands as disialyl-oligosaccharide mimetics exemplified on Siglec-2 (CD22). We report insights into development of dimeric ligands with high affinity and avidity to cell surface-expressed CD22, assay development, tool compounds, structure activity relationships, and biological data on calcium flux regulation in B-cells. The binding modes of selected ligands have been modeled based on state-of-the-art molecular dynamics simulations on the microsecond timescale, providing detailed views on ligand binding and opening a new perspective on drug design efforts for Siglecs. High-avidity dimeric ligands containing a linker opening the way towards bispecifics are presented as well.
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Affiliation(s)
| | - Astrid Schweizer
- Chair of Genetics, Department of Biology, University of Erlangen, 91058 Erlangen, Germany
| | - Martin Frank
- Biognos AB, Generatorsgatan 1, 40274 Göteborg, Sweden
| | | | - Julia Ring
- Chair of Genetics, Department of Biology, University of Erlangen, 91058 Erlangen, Germany
| | - Lars Nitschke
- Chair of Genetics, Department of Biology, University of Erlangen, 91058 Erlangen, Germany
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8
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Wang WL, Kasamatsu J, Joshita S, Gilfillan S, Di Luccia B, Panda SK, Kim DH, Desai P, Bando JK, Huang SCC, Yomogida K, Hoshino H, Fukushima M, Jacobsen EA, Van Dyken SJ, Ruedl C, Cella M, Colonna M. The aryl hydrocarbon receptor instructs the immunomodulatory profile of a subset of Clec4a4 + eosinophils unique to the small intestine. Proc Natl Acad Sci U S A 2022; 119:e2204557119. [PMID: 35653568 PMCID: PMC9191779 DOI: 10.1073/pnas.2204557119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/10/2022] [Indexed: 11/18/2022] Open
Abstract
C-type lectin domain family 4, member a4 (Clec4a4) is a C-type lectin inhibitory receptor specific for glycans thought to be exclusively expressed on murine CD8α− conventional dendritic cells. Using newly generated Clec4a4-mCherry knock-in mice, we identify a subset of Clec4a4-expressing eosinophils uniquely localized in the small intestine lamina propria. Clec4a4+ eosinophils evinced an immunomodulatory signature, whereas Clec4a4− eosinophils manifested a proinflammatory profile. Clec4a4+ eosinophils expressed high levels of aryl hydrocarbon receptor (Ahr), which drove the expression of Clec4a4 as well as other immunomodulatory features, such as PD-L1. The abundance of Clec4a4+ eosinophils was dependent on dietary AHR ligands, increased with aging, and declined in inflammatory conditions. Mice lacking AHR in eosinophils expanded innate lymphoid cells of type 2 and cleared Nippostrongylus brasiliensis infection more effectively than did wild-type mice. These results highlight the heterogeneity of eosinophils in response to tissue cues and identify a unique AHR-dependent subset of eosinophils in the small intestine with an immunomodulatory profile.
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Affiliation(s)
- Wei-Le Wang
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Jun Kasamatsu
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
- Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 980-8575 Sendai, Japan
| | - Satoru Joshita
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
- Department of Medicine, Division of Gastroenterology and Hepatology, Shinshu University School of Medicine, 390-8621 Matsumoto, Japan
| | - Susan Gilfillan
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Blanda Di Luccia
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Santosh K. Panda
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Do-Hyun Kim
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Pritesh Desai
- Department of Medicine, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Jennifer K. Bando
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305
| | - Stanley Ching-Cheng Huang
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
- Department of Pathology, Case Western Reserve University School of Medicine, Cleveland, OH 44106
| | - Kentaro Yomogida
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Hitomi Hoshino
- Department of Tumor Pathology, Faculty of Medical Sciences, University of Fukui, 910-1193 Eiheiji, Japan
| | - Mana Fukushima
- Department of Tumor Pathology, Faculty of Medical Sciences, University of Fukui, 910-1193 Eiheiji, Japan
| | - Elizabeth A. Jacobsen
- Division of Allergy, Asthma and Clinical Immunology, Mayo Clinic Arizona, Scottsdale, AZ 85259
| | - Steven J. Van Dyken
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Christiane Ruedl
- School of Biological Sciences, Nanyang Technological University, 637551 Singapore
| | - Marina Cella
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
| | - Marco Colonna
- Department of Pathology and Immunology, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110
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9
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Transgenic mouse models to study the physiological and pathophysiological roles of human Siglecs. Biochem Soc Trans 2022; 50:935-950. [PMID: 35383825 DOI: 10.1042/bst20211203] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/14/2022] [Accepted: 03/18/2022] [Indexed: 12/14/2022]
Abstract
Sialic acid-binding immunoglobulin-like lectins (Siglecs) are important immunomodulatory receptors. Due to differences between human and mouse Siglecs, defining the in vivo roles for human Siglecs (hSiglecs) can be challenging. One solution is the development and use of hSiglec transgenic mice to assess the physiological roles of hSiglecs in health and disease. These transgenic mice can also serve as important models for the pre-clinical testing of immunomodulatory approaches that are based on targeting hSiglecs. Four general methods have been used to create hSiglec-expressing transgenic mice, each with associated advantages and disadvantages. To date, transgenic mouse models expressing hSiglec-2 (CD22), -3 (CD33), -7, -8, -9, -11, and -16 have been created. This review focuses on both the generation of these hSiglec transgenic mice, along with the important findings that have been made through their study. Cumulatively, hSiglec transgenic mouse models are providing a deeper understanding of the differences between human and mice orthologs/paralogs, mechanisms by which Siglecs regulate immune cell signaling, physiological roles of Siglecs in disease, and different paradigms where targeting Siglecs may be therapeutically advantageous.
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10
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Karmakar J, Mukherjee K, Mandal C. Siglecs Modulate Activities of Immune Cells Through Positive and Negative Regulation of ROS Generation. Front Immunol 2021; 12:758588. [PMID: 34804046 PMCID: PMC8595208 DOI: 10.3389/fimmu.2021.758588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Accepted: 10/18/2021] [Indexed: 12/13/2022] Open
Abstract
Reactive oxygen species (ROS) are a group of oxygen-containing highly-reactive molecules produced from oxidative metabolic processes or in response to intracellular signals like cytokines and external stimuli like pathogen attack. They regulate a range of physiological processes and are involved in innate immune responses against infectious agents. Deregulation of ROS contributes to a plethora of disease conditions. Sialic acids are carbohydrates, present on cell surfaces or soluble proteins. Sialic acid-binding immunoglobulin-like lectins (Siglecs) recognize and bind to sialic acids. These are widely expressed on various types of immune cells. Siglecs modulate immune activation and can promote or inhibit ROS generation under different contexts. Siglecs promote ROS-dependent cell death in neutrophils and eosinophils while limiting oxidative stress associated with chronic obstructive pulmonary disease (COPD), sickle cell disease (SCD), coronavirus disease-2019 (COVID-19), etc. This review distinguishes itself in summarizing the current understanding of the role of Siglecs in moderating ROS production and their distinct effect on different immune cells; that ultimately determine the cellular response and the disease outcome. This is an important field of investigation having scope for both expansion and medical importance.
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Affiliation(s)
| | | | - Chitra Mandal
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Biology, Kolkata, India
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11
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Pierre N, Salée C, Vieujean S, Bequet E, Merli AM, Siegmund B, Meuwis MA, Louis E. Review article: distinctions between ileal and colonic Crohn's disease: from physiology to pathology. Aliment Pharmacol Ther 2021; 54:779-791. [PMID: 34297423 DOI: 10.1111/apt.16536] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 05/15/2021] [Accepted: 07/05/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Ileal and colonic Crohn's disease seem to be two separate entities. AIMS To describe the main physiological distinctions between the small and the large intestine and to analyse the differences between ileal and colonic Crohn's disease. METHODS The relevant literature was critically examined and synthesised. RESULTS The small and large intestine have fundamental distinctions (anatomy, cellular populations, immune defence, microbiota). The differences between ileal and colonic Crohn's disease are highlighted by a heterogeneous body of evidence including clinical features (natural history of the disease, efficacy of treatments, and monitoring), epidemiological data (smoking status, age, gender) and biological data (genetics, microbiota, immunity, mesenteric fat). However, the contribution of these factors to disease location remains poorly understood. CONCLUSION The classification of ileal and colonic Crohn's disease as distinct subphenotypes is well supported by the literature. Understanding of these differences could be exploited to develop more individualised patient care.
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Affiliation(s)
- Nicolas Pierre
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium
| | - Catherine Salée
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium
| | - Sophie Vieujean
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium.,Hepato-Gastroenterology and Digestive Oncology Department, Liège University Hospital, Liège, Belgium
| | - Emeline Bequet
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium.,Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Liège University Hospital, Liège, Belgium
| | - Angela-Maria Merli
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium
| | - Britta Siegmund
- Division of Gastroenterology, Infectiology and Rheumatology, Medical Department, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Berlin, Germany
| | - Marie-Alice Meuwis
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium.,Hepato-Gastroenterology and Digestive Oncology Department, Liège University Hospital, Liège, Belgium
| | - Edouard Louis
- Laboratory of Translational Gastroenterology, GIGA-Institute, University of Liège, Liège, Belgium.,Hepato-Gastroenterology and Digestive Oncology Department, Liège University Hospital, Liège, Belgium
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12
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Masterson JC, Menard-Katcher C, Larsen LD, Furuta GT, Spencer LA. Heterogeneity of Intestinal Tissue Eosinophils: Potential Considerations for Next-Generation Eosinophil-Targeting Strategies. Cells 2021; 10:cells10020426. [PMID: 33671475 PMCID: PMC7922004 DOI: 10.3390/cells10020426] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 02/05/2023] Open
Abstract
Eosinophils are implicated in the pathophysiology of a spectrum of eosinophil-associated diseases, including gastrointestinal eosinophilic diseases (EGIDs). Biologics that target the IL-5 pathway and are intended to ablate eosinophils have proved beneficial in severe eosinophilic asthma and may offer promise in treating some endotypes of EGIDs. However, destructive effector functions of eosinophils are only one side of the coin; eosinophils also play important roles in immune and tissue homeostasis. A growing body of data suggest tissue eosinophils represent a plastic and heterogeneous population of functional sub-phenotypes, shaped by environmental (systemic and local) pressures, which may differentially impact disease outcomes. This may be particularly relevant to the GI tract, wherein the highest density of eosinophils reside in the steady state, resident immune cells are exposed to an especially broad range of external and internal environmental pressures, and greater eosinophil longevity may uniquely enrich for co-expression of eosinophil sub-phenotypes. Here we review the growing evidence for functional sub-phenotypes of intestinal tissue eosinophils, with emphasis on the multifactorial pressures that shape and diversify eosinophil identity and potential targets to inform next-generation eosinophil-targeting strategies designed to restrain inflammatory eosinophil functions while sustaining homeostatic roles.
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Affiliation(s)
- Joanne C. Masterson
- Gastrointestinal Eosinophilic Diseases Program, Department of Pediatrics, Digestive Health Institute, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA; (J.C.M.); (C.M.-K.); (L.D.L.); (G.T.F.)
- GI and Liver Innate Immune Program, Department of Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA
- Allergy, Inflammation & Remodeling Research Laboratory, Kathleen Lonsdale Institute for Human Health Research, Department of Biology, Maynooth University, Maynooth, County Kildare, Ireland
| | - Calies Menard-Katcher
- Gastrointestinal Eosinophilic Diseases Program, Department of Pediatrics, Digestive Health Institute, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA; (J.C.M.); (C.M.-K.); (L.D.L.); (G.T.F.)
| | - Leigha D. Larsen
- Gastrointestinal Eosinophilic Diseases Program, Department of Pediatrics, Digestive Health Institute, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA; (J.C.M.); (C.M.-K.); (L.D.L.); (G.T.F.)
| | - Glenn T. Furuta
- Gastrointestinal Eosinophilic Diseases Program, Department of Pediatrics, Digestive Health Institute, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA; (J.C.M.); (C.M.-K.); (L.D.L.); (G.T.F.)
- GI and Liver Innate Immune Program, Department of Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Lisa A. Spencer
- Gastrointestinal Eosinophilic Diseases Program, Department of Pediatrics, Digestive Health Institute, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA; (J.C.M.); (C.M.-K.); (L.D.L.); (G.T.F.)
- GI and Liver Innate Immune Program, Department of Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA
- Correspondence: ; Tel.: +1-303-724-3277
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13
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Fernandes VE, Ercoli G, Bénard A, Brandl C, Fahnenstiel H, Müller-Winkler J, Weber GF, Denny P, Nitschke L, Andrew PW. The B-cell inhibitory receptor CD22 is a major factor in host resistance to Streptococcus pneumoniae infection. PLoS Pathog 2020; 16:e1008464. [PMID: 32324805 PMCID: PMC7179836 DOI: 10.1371/journal.ppat.1008464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 03/06/2020] [Indexed: 01/29/2023] Open
Abstract
Streptococcus pneumoniae is a major human pathogen, causing pneumonia and sepsis. Genetic components strongly influence host responses to pneumococcal infections, but the responsible loci are unknown. We have previously identified a locus on mouse chromosome 7 from a susceptible mouse strain, CBA/Ca, to be crucial for pneumococcal infection. Here we identify a responsible gene, Cd22, which carries a point mutation in the CBA/Ca strain, leading to loss of CD22 on B cells. CBA/Ca mice and gene-targeted CD22-deficient mice on a C57BL/6 background are both similarly susceptible to pneumococcal infection, as shown by bacterial replication in the lungs, high bacteremia and early death. After bacterial infections, CD22-deficient mice had strongly reduced B cell populations in the lung, including GM-CSF producing, IgM secreting innate response activator B cells, which are crucial for protection. This study provides striking evidence that CD22 is crucial for protection during invasive pneumococcal disease. Streptococcus pneumoniae (known as the pneumococcus) is a human bacterial pathogen responsible for diseases such as pneumonia and sepsis, that cause illness and death in millions of individuals. Susceptibility to pneumococcal infections is associated with genetic components that strongly influence how infected individuals respond to infection, but little is known about the causal gene(s) and the mechanisms of control of the infection. In previous studies we have found strong differences in susceptibility and resistance to pneumococcal infections between mouse strains. In this study we identified a gene, the Cd22 gene, that controls resistance to pneumococcal infection. Mice without the B-cell specific CD22 protein were much more susceptible to infection with S. pneumoniae. We could show that a protective population of B cells that migrates to the lung during pneumococcal infection is missing in Cd22-deficient mice. The study shows to a new role for CD22 and indicates a new potential target for treatment of pneumococcal infections.
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Affiliation(s)
- Vitor E. Fernandes
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
- * E-mail: (VEF); (LN); (PWA)
| | - Giuseppe Ercoli
- Department of Genetics, University of Leicester, Leicester, United Kingdom
| | - Alan Bénard
- Department of Surgery, University Hospital Erlangen, Erlangen, Germany
| | - Carolin Brandl
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| | - Hannah Fahnenstiel
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| | | | - Georg F. Weber
- Department of Surgery, University Hospital Erlangen, Erlangen, Germany
| | - Paul Denny
- Mammalian Genetics Unit, Medical Research Council, Harwell, United Kingdom
| | - Lars Nitschke
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
- * E-mail: (VEF); (LN); (PWA)
| | - Peter W. Andrew
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
- * E-mail: (VEF); (LN); (PWA)
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14
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Malachowski T, Hassel A. Engineering nanoparticles to overcome immunological barriers for enhanced drug delivery. ENGINEERED REGENERATION 2020. [DOI: 10.1016/j.engreg.2020.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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15
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Enterina JR, Jung J, Macauley MS. Coordinated roles for glycans in regulating the inhibitory function of CD22 on B cells. Biomed J 2019; 42:218-232. [PMID: 31627864 PMCID: PMC6818156 DOI: 10.1016/j.bj.2019.07.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/19/2019] [Accepted: 07/26/2019] [Indexed: 01/17/2023] Open
Abstract
CD22 is an inhibitory B cell co-receptor that recognizes sialic acid-containing glycoconjugates as ligands. Interactions with its glycan ligands are key to regulating the ability of CD22 to modulate B cell function, the most widely explored of which is antagonizing B cell receptor (BCR) signaling. Most importantly, interactions of CD22 with ligands on the same cell (cis) control the organization of CD22 on the cell surface, which minimizes co-localization with the BCR. In contrast with the modest ability of CD22 to intrinsically dampen BCR signaling, glycan ligands presented on another cell (trans) along with an antigen drawn CD22 and the BCR together within an immunological synapse, strongly inhibiting BCR signaling. New concepts are emerging for how CD22 controls B cell function, such as changes in glycosylation at different stages of B cell differentiation, specifically on GC B cells. Related to these changes, new players, such galectin-9, have been discovered that regulate cell surface nanoclusters of CD22. Roles of glycan ligands in controlling CD22 are the primary focus of this review as we highlight the ability of CD22 to modulate B cell function.
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Affiliation(s)
- Jhon R Enterina
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada
| | - Jaesoo Jung
- Department of Chemistry, University of Alberta, Edmonton, Canada
| | - Matthew S Macauley
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada; Department of Chemistry, University of Alberta, Edmonton, Canada.
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16
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Pure yeast beta-glucan and two types of yeast cell wall extracts enhance cell migration in porcine intestine model. J Funct Foods 2019. [DOI: 10.1016/j.jff.2019.05.037] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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17
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Peñaranda MMD, Jensen I, Tollersrud LG, Bruun JA, Jørgensen JB. Profiling the Atlantic Salmon IgM + B Cell Surface Proteome: Novel Information on Teleost Fish B Cell Protein Repertoire and Identification of Potential B Cell Markers. Front Immunol 2019; 10:37. [PMID: 30761128 PMCID: PMC6362898 DOI: 10.3389/fimmu.2019.00037] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 01/08/2019] [Indexed: 01/04/2023] Open
Abstract
Fish immunology research is at a pivotal point with the increasing availability of functional immunoassays and major advances in omics approaches. However, studies on fish B cells and their distinct subsets remain a challenge due to the limited availability of differentially expressed surface markers. To address this constraint, cell surface proteome of Atlantic salmon IgM+ B cells were analyzed by mass spectrometry and compared to surface proteins detected from two adherent salmon head kidney cell lines, ASK and SSP-9. Out of 21 cluster of differentiation (CD) molecules identified on salmon IgM+ B cells, CD22 and CD79A were shortlisted as potential markers based on the reported B cell-specific surface expression of their mammalian homologs. Subsequent RT-qPCR analyses of flow cytometry-sorted subpopulations from head kidney leukocytes confirmed that both cd22 and cd79a genes were highly expressed in IgM+ lymphoid cells but were observed in barely detectable levels in IgM- non-lymphoid suspension and adherent cells. Similarly, significantly high cd22 and cd79a mRNA levels were observed in IgM+ or IgT+ lymphoid cells from the spleen and peritoneal cavity, but not in their corresponding IgM- IgT- non-lymphoid fractions. This suggests that the B cell restrictive expression of CD22 and CD79A extend down to the transcription level, which was consistent across different lymphoid compartments and immunoglobulin isotypes, thus strongly supporting the potential of CD22 and CD79A as pan-B cell markers for salmon. In addition, this study provides novel information on the salmon B cell surface protein repertoire, as well as insights on B cell evolution. Further investigation of the identified salmon CD molecules, including development of immunological tools for detection, will help advance our understanding of the dynamics of salmon B cell responses such as during infection, vaccination, or immunostimulation.
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Affiliation(s)
- Ma Michelle D Peñaranda
- The Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway
| | - Ingvill Jensen
- The Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway
| | - Linn G Tollersrud
- The Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway
| | - Jack-Ansgar Bruun
- Tromsø University Proteomics Platform, Institute of Medical Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Jorunn B Jørgensen
- The Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway
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18
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Khoury P, Akuthota P, Ackerman SJ, Arron JR, Bochner BS, Collins MH, Kahn JE, Fulkerson PC, Gleich GJ, Gopal-Srivastava R, Jacobsen EA, Leiferman KM, Francesca LS, Mathur SK, Minnicozzi M, Prussin C, Rothenberg ME, Roufosse F, Sable K, Simon D, Simon HU, Spencer LA, Steinfeld J, Wardlaw AJ, Wechsler ME, Weller PF, Klion AD. Revisiting the NIH Taskforce on the Research needs of Eosinophil-Associated Diseases (RE-TREAD). J Leukoc Biol 2018; 104:69-83. [PMID: 29672914 PMCID: PMC6171343 DOI: 10.1002/jlb.5mr0118-028r] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 02/21/2018] [Accepted: 02/21/2018] [Indexed: 02/05/2023] Open
Abstract
Eosinophil-associated diseases (EADs) are rare, heterogeneous disorders characterized by the presence of eosinophils in tissues and/or peripheral blood resulting in immunopathology. The heterogeneity of tissue involvement, lack of sufficient animal models, technical challenges in working with eosinophils, and lack of standardized histopathologic approaches have hampered progress in basic research. Additionally, clinical trials and drug development for rare EADs are limited by the lack of primary and surrogate endpoints, biomarkers, and validated patient-reported outcomes. Researchers with expertise in eosinophil biology and eosinophil-related diseases reviewed the state of current eosinophil research, resources, progress, and unmet needs in the field since the 2012 meeting of the NIH Taskforce on the Research of Eosinophil-Associated Diseases (TREAD). RE-TREAD focused on gaps in basic science, translational, and clinical research on eosinophils and eosinophil-related pathogenesis. Improved recapitulation of human eosinophil biology and pathogenesis in murine models was felt to be of importance. Characterization of eosinophil phenotypes, the role of eosinophil subsets in tissues, identification of biomarkers of eosinophil activation and tissue load, and a better understanding of the role of eosinophils in human disease were prioritized. Finally, an unmet need for tools for use in clinical trials was emphasized. Histopathologic scoring, patient- and clinician-reported outcomes, and appropriate coding were deemed of paramount importance for research collaborations, drug development, and approval by regulatory agencies. Further exploration of the eosinophil genome, epigenome, and proteome was also encouraged. Although progress has been made since 2012, unmet needs in eosinophil research remain a priority.
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Affiliation(s)
- Paneez Khoury
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Praveen Akuthota
- Division of Pulmonary, Critical Care and Sleep Medicine, University of California, La Jolla, California, USA
| | - Steven J. Ackerman
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Joseph R. Arron
- Immunology Discovery, Genentech, Inc., South San Francisco, California, USA
| | - Bruce S. Bochner
- Department of Medicine, Division of Allergy and Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Margaret H. Collins
- Division of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, USA
| | | | - Patricia C. Fulkerson
- Division of Allergy and Immunology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Gerald J. Gleich
- Departments of Dermatology and Medicine, University of Utah Health, Salt Lake City, Utah, USA
| | - Rashmi Gopal-Srivastava
- National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, Maryland, USA
| | | | | | - Levi-Schaffer Francesca
- Pharmacology and Experimental Therapeutics Unit, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
| | - Sameer K. Mathur
- University of Wisconsin School of Medicine and Public Health, Madison,Wisconsin, USA
| | - Michael Minnicozzi
- Division of Allergy, Immunology and Transplantation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | | | - Marc E. Rothenberg
- Division of Allergy and Immunology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | | | - Kathleen Sable
- American Partnership For Eosinophilic Disorders, Atlanta, Georgia, USA
| | - Dagmar Simon
- Department of Dermatology, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Hans-Uwe Simon
- Institute of Pharmacology, University of Bern, Bern, Switzerland
| | - Lisa A. Spencer
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | | | - Andrew J. Wardlaw
- Institute for Lung Health, University of Leicester, Leicester, England
| | | | - Peter F. Weller
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Amy D. Klion
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
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19
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Grace JO, Malik A, Reichman H, Munitz A, Barski A, Fulkerson PC. Reuse of public, genome-wide, murine eosinophil expression data for hypotheses development. J Leukoc Biol 2018; 104:185-193. [PMID: 29758095 DOI: 10.1002/jlb.1ma1117-444r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 02/12/2018] [Accepted: 03/18/2018] [Indexed: 12/12/2022] Open
Abstract
The eosinophil (Eos) surface phenotype and activation state is altered after recruitment into tissues and after exposure to pro-inflammatory cytokines. In addition, distinct Eos functional subsets have been described, suggesting that tissue-specific responses for Eos contribute to organ homeostasis. Understanding the mechanisms by which Eos subsets achieve their tissue-specific identity is currently an unmet goal for the eosinophil research community. Publicly archived expression data can be used to answer original questions, test and generate new hypotheses, and serve as a launching point for experimental design. With these goals in mind, we investigated the effect of genetic background, culture methods, and tissue residency on murine Eos gene expression using publicly available, genome-wide expression data. Eos differentiated from cultures have a gene expression profile that is distinct from that of native homeostatic Eos; thus, researchers can repurpose published expression data to aid in selecting the appropriate culture method to study their gene of interest. In addition, we identified Eos lung- and gastrointestinal-specific transcriptomes, highlighting the profound effect of local tissue environment on gene expression in a terminally differentiated granulocyte even at homeostasis. Expanding the "toolbox" of Eos researchers to include public-data reuse can reduce redundancy, increase research efficiency, and lead to new biological insights.
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Affiliation(s)
- Jillian O Grace
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Astha Malik
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Hadar Reichman
- Department of Clinical Microbiology and Immunology, The Sackler School of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Ariel Munitz
- Department of Clinical Microbiology and Immunology, The Sackler School of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Artem Barski
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.,Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Patricia C Fulkerson
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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20
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Abstract
Human eosinophils have characteristic morphologic features, including a bilobed nucleus and cytoplasmic granules filled with cytotoxic and immunoregulatory proteins that are packaged in a specific manner. Eosinophil production in the bone marrow is exquisitely regulated by timely expression of a repertoire of transcription factors that work together via collaborative and hierarchical interactions to direct eosinophil development. In addition, proper granule formation, which occurs in a spatially organized manner, is an intrinsic checkpoint that must be passed for proper eosinophil production to occur. In eosinophil-associated disorders, eosinophils and their progenitors can be recruited in large numbers into tissues where they can induce proinflammatory organ damage in response to local signals. Eosinophils are terminally differentiated and do not proliferate once they leave the bone marrow. The cytokine IL-5 specifically enhances eosinophil production and, along with other mediators, promotes eosinophil activation. Indeed, eosinophil depletion with anti-IL-5 or anti-IL-5Rα is now proven to be clinically beneficial for several eosinophilic disorders, most notably severe asthma, and several therapeutics targeting eosinophil viability and production are now in development. Significant progress has been made in our understanding of eosinophil development and the consequences of tissue eosinophilia. Future research efforts focused on basic eosinophil immunobiology and translational efforts to assist in the diagnosis, treatment selection, and resolution of eosinophil-associated disorders will likely be informative and clinically helpful.
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Affiliation(s)
- Patricia C Fulkerson
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Marc E Rothenberg
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States.
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21
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Abstract
PURPOSE OF REVIEW Eosinophils are a subset of granulocytes generally associated with type 2 immune responses. They can contribute to protection against helminths but also mediate pro-inflammatory functions during allergic immune responses. Only recently, eosinophils were also found to exert many other functions such as regulation of glucose and fat metabolism, thermogenesis, survival of plasma cells, and antitumor activity. The mechanisms that control eosinophil development and survival are only partially understood. RECENT FINDINGS Here we review new findings regarding the role of cell-extrinsic and cell-intrinsic factors for eosinophilopoiesis and eosinophil homeostasis. Several reports provide new insights in the regulation of eosinophil development by transcription factors, miRNAs and epigenetic modifications. Danger signals like lipopolysaccharide or alarmins can activate eosinophils but also prolong their lifespan. We further reflect on the observations that eosinophil development is tightly controlled by the unfolded protein stress response and formation of cytoplasmic granules. SUMMARY Eosinophils emerge as important regulators of diverse biological processes. Their differentiation and survival is tightly regulated by factors that are still poorly understood. Newly identified pathways involved in eosinophilopoiesis and eosinophil homeostasis may lead to development of new therapeutic options for treatment of eosinophil-associated diseases.
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22
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Abstract
Eosinophils are a minority circulating granulocyte classically viewed as being involved in host defense against parasites and promoting allergic reactions. However, a series of new regulatory functions for these cells have been identified in the past decade. During homeostasis, eosinophils develop in the bone marrow and migrate from the blood into target tissues following an eotaxin gradient, with interleukin-5 being a key cytokine for eosinophil proliferation, survival, and priming. In multiple target tissues, eosinophils actively regulate a variety of immune functions through their vast arsenal of granule products and cytokines, as well as direct cellular interaction with cells in proximity. The immunologic regulation of eosinophils extends from innate immunity to adaptive immunity and also involves non-immune cells. Herein, we summarize recent findings regarding novel roles of murine and human eosinophils, focusing on interactions with other hematopoietic cells. We also review new experimental tools available and remaining questions to uncover a greater understanding of this enigmatic cell.
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23
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O’Sullivan JA, Carroll DJ, Bochner BS. Glycobiology of Eosinophilic Inflammation: Contributions of Siglecs, Glycans, and Other Glycan-Binding Proteins. Front Med (Lausanne) 2017; 4:116. [PMID: 28824909 PMCID: PMC5539825 DOI: 10.3389/fmed.2017.00116] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 07/10/2017] [Indexed: 12/31/2022] Open
Abstract
The historical focus on protein-protein interactions in biological systems, at the expense of attention given to interactions between other classes of molecules, has overlooked important and clinically relevant processes and points of potential clinical intervention. For example, the significance of protein-carbohydrate interactions, especially in the regulation of immune responses, has recently received greater recognition and appreciation. This review discusses several ways by which cell-surface lectin-glycan interactions can modulate eosinophil function, particularly at the levels of eosinophil recruitment and survival, and how such interactions can be exploited therapeutically. A primary focus is on discoveries concerning Siglec-8, a glycan-binding protein selectively expressed on human eosinophils, and its closest functional paralog in the mouse, Siglec-F. Recent advances in the synthesis of polymeric ligands, the identification of physiological ligands for Siglec-8 and Siglec-F in the airway, and the determination of the basis of glycan ligand discrimination of Siglec-8 are discussed. Important similarities and differences between these siglecs are outlined. Eosinophil expression of additional glycan-binding proteins or their glycan ligands, including interactions involving members of the selectin, galectin, and siglec families, is summarized. The roles of these molecules in eosinophil recruitment, survival, and inflammation are described. Finally, the modulation of these interactions and potential therapeutic exploitation of glycan-binding proteins and their ligands to ameliorate eosinophil-associated diseases are considered.
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Affiliation(s)
- Jeremy A. O’Sullivan
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - Daniela J. Carroll
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - Bruce S. Bochner
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
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24
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Gangwar RS, Landolina N, Arpinati L, Levi-Schaffer F. Mast cell and eosinophil surface receptors as targets for anti-allergic therapy. Pharmacol Ther 2016; 170:37-63. [PMID: 27773785 DOI: 10.1016/j.pharmthera.2016.10.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Roopesh Singh Gangwar
- Pharmacology & Experimental Therapeutics Unit, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel
| | - Nadine Landolina
- Pharmacology & Experimental Therapeutics Unit, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel
| | - Ludovica Arpinati
- Pharmacology & Experimental Therapeutics Unit, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel
| | - Francesca Levi-Schaffer
- Pharmacology & Experimental Therapeutics Unit, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel.
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Forman R, Bramhall M, Logunova L, Svensson-Frej M, Cruickshank SM, Else KJ. Eosinophils may play regionally disparate roles in influencing IgA(+) plasma cell numbers during large and small intestinal inflammation. BMC Immunol 2016; 17:12. [PMID: 27245920 PMCID: PMC4886441 DOI: 10.1186/s12865-016-0153-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 05/23/2016] [Indexed: 01/05/2023] Open
Abstract
Background Eosinophils are innate immune cells present in the intestine during steady state conditions. An intestinal eosinophilia is a hallmark of many infections and an accumulation of eosinophils is also observed in the intestine during inflammatory disorders. Classically the function of eosinophils has been associated with tissue destruction, due to the release of cytotoxic granule contents. However, recent evidence has demonstrated that the eosinophil plays a more diverse role in the immune system than previously acknowledged, including shaping adaptive immune responses and providing plasma cell survival factors during the steady state. Importantly, it is known that there are regional differences in the underlying immunology of the small and large intestine, but whether there are differences in context of the intestinal eosinophil in the steady state or inflammation is not known. Results Our data demonstrates that there are fewer IgA+ plasma cells in the small intestine of eosinophil-deficient ΔdblGATA-1 mice compared to eosinophil-sufficient wild-type mice, with the difference becoming significant post-infection with Toxoplasma gondii. Remarkably, and in complete contrast, the absence of eosinophils in the inflamed large intestine does not impact on IgA+ cell numbers during steady state, and is associated with a significant increase in IgA+ cells post-infection with Trichuris muris compared to wild-type mice. Thus, the intestinal eosinophil appears to be less important in sustaining the IgA+ cell pool in the large intestine compared to the small intestine, and in fact, our data suggests eosinophils play an inhibitory role. The dichotomy in the influence of the eosinophil over small and large intestinal IgA+ cells did not depend on differences in plasma cell growth factors, recruitment potential or proliferation within the different regions of the gastrointestinal tract (GIT). Conclusions We demonstrate for the first time that there are regional differences in the requirement of eosinophils for maintaining IgA+ cells between the large and small intestine, which are more pronounced during inflammation. This is an important step towards further delineation of the enigmatic functions of gut-resident eosinophils. Electronic supplementary material The online version of this article (doi:10.1186/s12865-016-0153-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ruth Forman
- Department of Immunology, University of Manchester, Manchester, UK.
| | - Michael Bramhall
- Department of Immunology, University of Manchester, Manchester, UK
| | - Larisa Logunova
- Department of Immunology, University of Manchester, Manchester, UK
| | | | | | - Kathryn J Else
- Department of Immunology, University of Manchester, Manchester, UK
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IL-1β in eosinophil-mediated small intestinal homeostasis and IgA production. Mucosal Immunol 2015; 8:930-42. [PMID: 25563499 PMCID: PMC4481137 DOI: 10.1038/mi.2014.123] [Citation(s) in RCA: 125] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 10/30/2014] [Indexed: 02/04/2023]
Abstract
Eosinophils are multifunctional leukocytes that reside in the gastrointestinal (GI) lamina propria, where their basal function remains largely unexplored. In this study, by examining mice with a selective deficiency of systemic eosinophils (by lineage ablation) or GI eosinophils (eotaxin-1/2 double deficient or CC chemokine receptor 3 deficient), we show that eosinophils support immunoglobulin A (IgA) class switching, maintain intestinal mucus secretions, affect intestinal microbial composition, and promote the development of Peyer's patches. Eosinophil-deficient mice showed reduced expression of mediators of secretory IgA production, including intestinal interleukin 1β (IL-1β), inducible nitric oxide synthase, lymphotoxin (LT) α, and LT-β, and reduced levels of retinoic acid-related orphan receptor gamma t-positive (ROR-γt(+)) innate lymphoid cells (ILCs), while maintaining normal levels of APRIL (a proliferation-inducing ligand), BAFF (B cell-activating factor of the tumor necrosis factor family), and TGF-β (transforming growth factor β). GI eosinophils expressed a relatively high level of IL-1β, and IL-1β-deficient mice manifested the altered gene expression profiles observed in eosinophil-deficient mice and decreased levels of IgA(+) cells and ROR-γt(+) ILCs. On the basis of these collective data, we propose that eosinophils are required for homeostatic intestinal immune responses including IgA production and that their affect is mediated via IL-1β in the small intestine.
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Differential roles of inflammation and apoptosis in initiation of mid-gestational abortion in malaria-infected C57BL/6 and A/J mice. Placenta 2015; 36:738-49. [PMID: 25956987 DOI: 10.1016/j.placenta.2015.04.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 03/26/2015] [Accepted: 04/14/2015] [Indexed: 01/05/2023]
Abstract
INTRODUCTION Plasmodium chabaudi AS-infection in pregnant A/J and C57BL/6J mice results in mid-gestational pregnancy loss. Although associated with increased systemic and placental pro-inflammatory responses and coagulopathy, the molecular mechanisms that underlie poor pregnancy outcomes in these mice are not yet fully understood. This study investigates the relationships between inflammation, apoptosis and malaria-induced pregnancy loss. METHODS Infection with P. chabaudi AS in early murine pregnancy and term human placental tissues from an endemic setting were assessed by histology, immunohistochemistry, TUNEL staining, real-time PCR, flow cytometry, western blot, and ELISA. RESULTS Quantitative PCR reveals accumulation of lymphocytes and monocytes and upregulation of chemokines that attract these cell types in malaria-exposed mid-gestational A/J conceptuses. Monocyte accumulation is confirmed by flow cytometry and placental immunohistochemistry. Concurrent with initiation of malaria-induced abortion, markers of apoptosis are evident in the junctional zone, but not the labyrinth, of A/J placentae. In contrast, mid-gestation conceptuses in infected C57BL/6J lack evidence for monocyte accumulation, exhibiting low or no in situ placental staining despite trophoblast immunoreactivity for the monokine, CCL2. Additionally, placental apoptosis is not consistently observed, and when evident, appears after malaria-induced abortion typically initiates. Similarly, trophoblast apoptosis in term human placental malaria is not observed. Of those studied, a sole common feature of malaria-induced abortion in A/J and C57BL/6J mice is elevation of plasma tumor necrosis factor. DISCUSSION Consistent with our previous observations, tumor necrosis factor is likely to be a central driver of malaria-induced pregnancy loss in both strains, but likely operates through mechanisms distinct from placental apoptosis in C57BL/6J mice.
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Mucosal Eosinophils. Mucosal Immunol 2015. [DOI: 10.1016/b978-0-12-415847-4.00044-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Bowcutt R, Forman R, Glymenaki M, Carding SR, Else KJ, Cruickshank SM. Heterogeneity across the murine small and large intestine. World J Gastroenterol 2014; 20:15216-15232. [PMID: 25386070 PMCID: PMC4223255 DOI: 10.3748/wjg.v20.i41.15216] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 03/18/2014] [Accepted: 06/17/2014] [Indexed: 02/06/2023] Open
Abstract
The small and large intestine of the gastrointestinal tract (GIT) have evolved to have discrete functions with distinct anatomies and immune cell composition. The importance of these differences is underlined when considering that different pathogens have uniquely adapted to live in each region of the gut. Furthermore, different regions of the GIT are also associated with differences in susceptibility to diseases such as cancer and chronic inflammation. The large and small intestine, given their anatomical and functional differences, should be seen as two separate immunological sites. However, this distinction is often ignored with findings from one area of the GIT being inappropriately extrapolated to the other. Focussing largely on the murine small and large intestine, this review addresses the literature relating to the immunology and biology of the two sites, drawing comparisons between them and clarifying similarities and differences. We also highlight the gaps in our understanding and where further research is needed.
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Ericson JA, Duffau P, Yasuda K, Ortiz-Lopez A, Rothamel K, Rifkin IR, Monach PA. Gene expression during the generation and activation of mouse neutrophils: implication of novel functional and regulatory pathways. PLoS One 2014; 9:e108553. [PMID: 25279834 PMCID: PMC4184787 DOI: 10.1371/journal.pone.0108553] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 08/30/2014] [Indexed: 01/11/2023] Open
Abstract
As part of the Immunological Genome Project (ImmGen), gene expression was determined in unstimulated (circulating) mouse neutrophils and three populations of neutrophils activated in vivo, with comparison among these populations and to other leukocytes. Activation conditions included serum-transfer arthritis (mediated by immune complexes), thioglycollate-induced peritonitis, and uric acid-induced peritonitis. Neutrophils expressed fewer genes than any other leukocyte population studied in ImmGen, and down-regulation of genes related to translation was particularly striking. However, genes with expression relatively specific to neutrophils were also identified, particularly three genes of unknown function: Stfa2l1, Mrgpr2a and Mrgpr2b. Comparison of genes up-regulated in activated neutrophils led to several novel findings: increased expression of genes related to synthesis and use of glutathione and of genes related to uptake and metabolism of modified lipoproteins, particularly in neutrophils elicited by thioglycollate; increased expression of genes for transcription factors in the Nr4a family, only in neutrophils elicited by serum-transfer arthritis; and increased expression of genes important in synthesis of prostaglandins and response to leukotrienes, particularly in neutrophils elicited by uric acid. Up-regulation of genes related to apoptosis, response to microbial products, NFkB family members and their regulators, and MHC class II expression was also seen, in agreement with previous studies. A regulatory model developed from the ImmGen data was used to infer regulatory genes involved in the changes in gene expression during neutrophil activation. Among 64, mostly novel, regulatory genes predicted to influence these changes in gene expression, Irf5 was shown to be important for optimal secretion of IL-10, IP-10, MIP-1α, MIP-1β, and TNF-α by mouse neutrophils in vitro after stimulation through TLR9. This data-set and its analysis using the ImmGen regulatory model provide a basis for additional hypothesis-based research on the importance of changes in gene expression in neutrophils in different conditions.
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Affiliation(s)
- Jeffrey A. Ericson
- Division of Immunology, Department of Microbiology and Immunology, Harvard Medical School, Boston, MA, United States of America
| | - Pierre Duffau
- Department of Medicine, Boston University School of Medicine, Boston, MA, United States of America
| | - Kei Yasuda
- Department of Medicine, Boston University School of Medicine, Boston, MA, United States of America
| | - Adriana Ortiz-Lopez
- Division of Immunology, Department of Microbiology and Immunology, Harvard Medical School, Boston, MA, United States of America
| | - Katherine Rothamel
- Division of Immunology, Department of Microbiology and Immunology, Harvard Medical School, Boston, MA, United States of America
| | - Ian R. Rifkin
- Department of Medicine, Boston University School of Medicine, Boston, MA, United States of America
| | - Paul A. Monach
- Department of Medicine, Boston University School of Medicine, Boston, MA, United States of America
- * E-mail:
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Abstract
The intestine represents the largest compartment of the immune system. It is continually exposed to antigens and immunomodulatory agents from the diet and the commensal microbiota, and it is the port of entry for many clinically important pathogens. Intestinal immune processes are also increasingly implicated in controlling disease development elsewhere in the body. In this Review, we detail the anatomical and physiological distinctions that are observed in the small and large intestines, and we suggest how these may account for the diversity in the immune apparatus that is seen throughout the intestine. We describe how the distribution of innate, adaptive and innate-like immune cells varies in different segments of the intestine and discuss the environmental factors that may influence this. Finally, we consider the implications of regional immune specialization for inflammatory disease in the intestine.
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Jung Y, Rothenberg ME. Roles and regulation of gastrointestinal eosinophils in immunity and disease. THE JOURNAL OF IMMUNOLOGY 2014; 193:999-1005. [PMID: 25049430 DOI: 10.4049/jimmunol.1400413] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Eosinophils have historically been considered to be destructive end-stage effector cells that have a role in parasitic infections and allergic reactions by the release of their granule-derived cytotoxic proteins. However, an increasing number of experimental observations indicate that eosinophils also are multifunctional leukocytes involved in diverse inflammatory and physiologic immune responses. Under homeostatic conditions, eosinophils are particularly abundant in the lamina propria of the gastrointestinal tract, where their involvement in various biological processes within the gastrointestinal tract has been posited. In this review, we summarize the molecular steps involved in eosinophil development and describe eosinophil trafficking to the gastrointestinal tract. We synthesize the current findings on the phenotypic and functional properties of gastrointestinal eosinophils and the accumulating evidence that they have a contributory role in gastrointestinal disorders, with a focus on primary eosinophilic gastrointestinal disorders. Finally, we discuss the potential role of eosinophils as modulators of the intestinal immune system.
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Affiliation(s)
- YunJae Jung
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and Department of Microbiology, Graduate School of Medicine, Gachon University, Incheon 406-799, Republic of Korea
| | - Marc E Rothenberg
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
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Kamel MM, Fouad SA, Basyoni MMA. P selectins and immunological profiles in HCV and Schistosoma mansoni induced chronic liver disease. BMC Gastroenterol 2014; 14:132. [PMID: 25066324 PMCID: PMC4119237 DOI: 10.1186/1471-230x-14-132] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 07/17/2014] [Indexed: 01/01/2023] Open
Abstract
Background Hepatitis C virus (HCV) and Schistosoma mansoni are major causes of chronic liver disease (CLD) in which immune alteration is common. Recent studies suggested that certain platelets and lymphocytes activation markers may have an impact on progression of CLD. This study aimed to evaluate the potential of platelets and lymphocytes activation molecules expression on the pathogenesis of CLD in distinct or concomitant chronic HCV and schistosomiasis mansoni infections. Methods The study populations were divided into group-I: patients with chronic schistosomiasis mansoni, group-II: HCV patients without cirrhosis, group-III: patients with combined liver diseases without cirrhosis, group-IV: patients with chronic HCV and liver cirrhosis and group-V: Age and sex matched healthy individuals as normal controls. All groups were subjected to full clinical evaluation, ELISA anti-HCV antibodies screening, parasitological examination for diagnosing S. mansoni and flow cytometry for lymphocyte (CD3, CD4, CD8, CD19, CD22, & CD56) and platelets activation (CD41, CD42 & CD62P (P- selectins)) markers. Results The platelet count was significantly decreased in HCV and/or S. mansoni patients. The total T-lymphocytes and T-helper cells were significantly reduced, while T-cytotoxics were increased. The patients possessed a significantly higher platelets activation marker; CD62P (P-selectins) and higher mean fluorescent intensity (MFI) positivity. There were considerable correlations between platelets count and both of CD62P and MFI. Conclusion Our Findings suggest an increased expression of certain platelets and lymphocytes activation markers in chronic HCV and S. mansoni induced CLD that may have a role in disease progression.
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Affiliation(s)
- Mahmoud M Kamel
- Department of Clinical Pathology, National Cancer Institute Cairo University, Cairo, Egypt.
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Eosinophils promote generation and maintenance of immunoglobulin-A-expressing plasma cells and contribute to gut immune homeostasis. Immunity 2014; 40:582-93. [PMID: 24745334 DOI: 10.1016/j.immuni.2014.02.014] [Citation(s) in RCA: 211] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 02/19/2014] [Indexed: 12/18/2022]
Abstract
Although in normal lamina propria (LP) large numbers of eosinophils are present, little is known about their role in mucosal immunity at steady state. Here we show that eosinophils are needed to maintain immune homeostasis in gut-associated tissues. By using eosinophil-deficient ΔdblGATA-1 and PHIL mice or an eosinophil-specific depletion model, we found a reduction in immunoglobulin A(+) (IgA(+)) plasma cell numbers and in secreted IgA. Eosinophil-deficient mice also showed defects in the intestinal mucous shield and alterations in microbiota composition in the gut lumen. In addition, TGF-β-dependent events including class switching to IgA in Peyer's patches (PP), the formation of CD103(+) T cells including Foxp3(+) regulatory (Treg), and also CD103(+) dendritic cells were disturbed. In vitro cultures showed that eosinophils produce factors that promote T-independent IgA class switching. Our findings show that eosinophils are important players for immune homeostasis in gut-associated tissues and add to data suggesting that eosinophils can promote tissue integrity.
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Nitschke L. CD22 and Siglec-G regulate inhibition of B-cell signaling by sialic acid ligand binding and control B-cell tolerance. Glycobiology 2014; 24:807-17. [PMID: 25002414 DOI: 10.1093/glycob/cwu066] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
CD22 and Siglec-G are two B-cell expressed members of the Siglec (sialic acid-binding immunoglobulin (Ig)-like lectin) family and are potent inhibitors of B-cell signaling. Genetic approaches have provided evidence that this inhibition of B-cell antigen receptor (BCR) signaling by Siglecs is dependent on ligand binding to sialic acids in specific linkages. The cis-ligand-binding activity of CD22 leads to homo-oligomer formation, which are to a large extent found in membrane domains that are distinct from those containing the BCR. In contrast, Siglec-G is recruited via sialic acid binding to the BCR. This interaction of Siglec-G with mIgM leads to an inhibitory function that seems to be specific for B-1 cells. Both CD22 and Siglec-G control B-cell tolerance and loss of these proteins, its ligands or its inhibitory pathways can increase the susceptibility for autoimmune diseases. CD22 is a target protein both in B-cell leukemias and lymphomas, as well as in B-cell mediated autoimmune diseases. Both antibodies and synthetic chemically modified sialic acids are currently tested to target Siglecs on B cells.
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Affiliation(s)
- Lars Nitschke
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
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Wen T, Mingler MK, Wahl B, Khorki ME, Pabst O, Zimmermann N, Rothenberg ME. Carbonic anhydrase IV is expressed on IL-5-activated murine eosinophils. THE JOURNAL OF IMMUNOLOGY 2014; 192:5481-9. [PMID: 24808371 DOI: 10.4049/jimmunol.1302846] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Eosinophilia and its cellular activation are hallmark features of asthma, as well as other allergic/Th2 disorders, yet there are few, if any, reliable surface markers of eosinophil activation. We have used a FACS-based genome-wide screening system to identify transcriptional alterations in murine lung eosinophils recruited and activated by pulmonary allergen exposure. Using a relatively stringent screen with false-positive correction, we identified 82 candidate genes that could serve as eosinophil activation markers and/or pathogenic effector markers in asthma. Carbonic anhydrase IV (Car4) was a top dysregulated gene with 36-fold induction in allergen-elicited pulmonary eosinophils, which was validated by quantitative PCR, immunohistochemistry, and flow cytometry. Eosinophil CAR4 expression was kinetically regulated by IL-5, but not IL-13. IL-5 was both necessary and sufficient for induction of eosinophil CAR4. Although CAR4-deficient mice did not have a defect in eosinophil recruitment to the lung, nor a change in eosinophil pH-buffering capacity, allergen-challenged chimeric mice that contained Car4(-/-) hematopoietic cells aberrantly expressed a series of genes enriched in biological processes involved in epithelial differentiation, keratinization, and anion exchange. In conclusion, we have determined that eosinophils express CAR4 following IL-5 or allergen exposure, and that CAR4 is involved in regulating the lung transcriptome associated with allergic airway inflammation; therefore, CAR4 has potential value for diagnosing and monitoring eosinophilic responses.
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Affiliation(s)
- Ting Wen
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
| | - Melissa K Mingler
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
| | - Benjamin Wahl
- Institute of Immunology, Hannover Medical School, 30625 Hannover, Germany
| | - M Eyad Khorki
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
| | - Oliver Pabst
- Institute of Immunology, Hannover Medical School, 30625 Hannover, Germany
| | - Nives Zimmermann
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
| | - Marc E Rothenberg
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229; and
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David J, Barkema HW, Mortier R, Ghosh S, Guan LL, De Buck J. Gene expression profiling and putative biomarkers of calves 3 months after infection with Mycobacterium avium subspecies paratuberculosis. Vet Immunol Immunopathol 2014; 160:107-17. [PMID: 24841487 DOI: 10.1016/j.vetimm.2014.04.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 03/31/2014] [Accepted: 04/22/2014] [Indexed: 01/09/2023]
Abstract
Mycobacterium avium subsp. paratuberculosis (MAP) causes Johne's disease (JD), a chronic granulomatous intestinal inflammation of ruminants. Current diagnostic tools lack sensitivity to detect JD early in infection; therefore, alternatives are desired. The objective was to identify potential biomarkers in whole blood of high- and low-dose (LD) MAP-challenged Holstein-Friesian calves 3 months after inoculation. Infected calves were designated MAP-positive using the IFN-γ release assay. Differential expression of transcripts in whole blood was compared between non-infected controls and HD, as well as LD calves, using the Affymetrix(®) GeneChip(®) Bovine Genome Array. Microarray data were analyzed using RMA and PLIER algorithms; 296 transcripts were differentially expressed (17 had ≥ 1.5 fold change). The HD and LD calves had differential gene expression profiles for up to 80% of differentially expressed genes. Pathway analyses using Ingenuity Pathway Analysis (IPA(®)) indicated inhibition of several defence mechanisms, including apoptosis, leukocyte and lymphocyte trafficking, overall repression of gene expression and potentially hydrogen peroxide production in macrophages. Further validation using qPCR verified increased expression of CD46, ICOS, and CEP350, but decreased expression of CTLA4, YARS, and PARVB in infected calves. Additionally, a comparison of seropositive and seronegative infected calves identified transcripts predictive of seroconversion. We concluded that IL6ST/gp130 and CD22 may have important roles in the induction of antibodies against MAP. Putative biomarkers of early MAP infection with roles in immune responses were identified; in addition, the importance of infective dose on biomarkers was determined.
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Affiliation(s)
- Joel David
- Department of Production Animal Health, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, Canada T2N 4N1.
| | - Herman W Barkema
- Department of Production Animal Health, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, Canada T2N 4N1; Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
| | - Rienske Mortier
- Department of Production Animal Health, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, Canada T2N 4N1.
| | - Subrata Ghosh
- Department of Production Animal Health, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, Canada T2N 4N1; Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
| | - Le Luo Guan
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5.
| | - Jeroen De Buck
- Department of Production Animal Health, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, Canada T2N 4N1.
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Lee HS, Jang MS, Kim JH, Hong CP, Lee EJ, Jeun EJ, Kim C, Kim EK, Ahn KS, Yang BG, Ahn KS, Jang YP, Ahn KS, Kim YM, Jang MH. Ulmus davidiana var. japonica Nakai upregulates eosinophils and suppresses Th1 and Th17 cells in the small intestine. PLoS One 2013; 8:e76716. [PMID: 24116141 PMCID: PMC3792050 DOI: 10.1371/journal.pone.0076716] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Accepted: 08/24/2013] [Indexed: 12/30/2022] Open
Abstract
The bark of Ulmus davidiana var. japonica Nakai (Ulmaceae) has been used in traditional Korean medicine for chronic inflammation in the gastrointestinal tract. Here we investigated the frequency and cytokine profile of the major immune cells in the small intestinal lamina propria (SI LP), spleen, and mesenteric lymph nodes (MLNs) of mice treated orally with Ulmus davidiana var. japonica Nakai bark water extract (UDE) to address the immunomodulatory role of this herb in intestinal homeostasis. B6 mice were given 5g/kg UDE once daily for 14 days. They were then sacrificed, and cells were isolated from the spleen, MLNs, and SI LP. The proportion of B versus T lymphocytes, CD4+ versus CD8+ T lymphocytes, Th1 and Th17 cells, and Foxp3+ regulatory T cells in the spleen, MLNs, and SI LP were analyzed. The frequency of antigen-presenting cells (APCs), including dendritic cells, macrophages, and eosinophils in the SI LP and the expression of costimulatory molecules on APCs were also evaluated. The numbers and frequencies of Th1 and Th17 cells in the SI LP were significantly reduced in the UDE-treated mice compared with PBS controls. In addition, the proportion of IL-4-producing eosinophils in the SI LP was significantly elevated in the UDE-treated mice compared with controls. Taken together, these data indicate that UDE up-regulates the number and frequency of SI LP eosinophils, which can down-regulate the Th1 and Th17 responses via IL-4 secretion and contribute to intestinal homeostasis.
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Affiliation(s)
- Han-Sung Lee
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul, Korea
| | - Min Seong Jang
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Jung-Hwan Kim
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Chun-Pyo Hong
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Eun-Jung Lee
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Eun Ji Jeun
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Chan Kim
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Eun-Kyung Kim
- Division of Pharmacognosy, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Kwang-Seong Ahn
- Division of Pharmacognosy, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Bo-Gie Yang
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Kwang Seok Ahn
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul, Korea
| | - Young Pyo Jang
- Division of Pharmacognosy, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Kyoo-Seok Ahn
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul, Korea
| | - You-Me Kim
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
| | - Myoung Ho Jang
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Korea
- Academy of Immunology and Microbiology (AIM), Institute for Basic Science (IBS), Pohang, Korea
- * E-mail:
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Deng L, Chen X, Varki A. Exploration of sialic acid diversity and biology using sialoglycan microarrays. Biopolymers 2013; 99:650-65. [PMID: 23765393 PMCID: PMC7161822 DOI: 10.1002/bip.22314] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Accepted: 06/04/2013] [Indexed: 12/13/2022]
Abstract
Sialic acids (Sias) are a group of α-keto acids with a nine-carbon backbone, which display many types of modifications in nature. The diversity of natural Sia presentations is magnified by a variety of glycosidic linkages to underlying glycans, the sequences and classes of such glycans, as well as the spatial organization of Sias with their surroundings. This diversity is closely linked to the numerous and varied biological functions of Sias. Relatively large libraries of natural and unnatural Sias have recently been chemically/chemoenzymatically synthesized and/or isolated from natural sources. The resulting sialoglycan microarrays have proved to be valuable tools for the exploration of diversity and biology of Sias. Here we provide an overview of Sia diversity in nature, the approaches used to generate sialoglycan microarrays, and the achievements and challenges arising.
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Affiliation(s)
- Lingquan Deng
- Departments of Medicine and Cellular & Molecular MedicineGlycobiology Research and Training Center, University of CaliforniaSan Diego, La JollaCA92093‐0687
| | - Xi Chen
- Department of ChemistryUniversity of CaliforniaDavisCA95616
| | - Ajit Varki
- Departments of Medicine and Cellular & Molecular MedicineGlycobiology Research and Training Center, University of CaliforniaSan Diego, La JollaCA92093‐0687
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Bouffi C, Rochman M, Zust CB, Stucke EM, Kartashov A, Fulkerson PC, Barski A, Rothenberg ME. IL-33 markedly activates murine eosinophils by an NF-κB-dependent mechanism differentially dependent upon an IL-4-driven autoinflammatory loop. THE JOURNAL OF IMMUNOLOGY 2013; 191:4317-25. [PMID: 24043894 DOI: 10.4049/jimmunol.1301465] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Eosinophils are major effector cells in type 2 inflammatory responses and become activated in response to IL-4 and IL-33, yet the molecular mechanisms and cooperative interaction between these cytokines remain unclear. Our objective was to investigate the molecular mechanism and cooperation of IL-4 and IL-33 in eosinophil activation. Eosinophils derived from bone marrow or isolated from Il5-transgenic mice were activated in the presence of IL-4 or IL-33 for 1 or 4 h, and the transcriptome was analyzed by RNA sequencing. The candidate genes were validated by quantitative PCR and ELISA. We demonstrated that murine-cultured eosinophils respond to IL-4 and IL-33 by phosphorylation of STAT-6 and NF-κB, respectively. RNA sequence analysis of murine-cultured eosinophils indicated that IL-33 induced 519 genes, whereas IL-4 induced only 28 genes, including 19 IL-33-regulated genes. Interestingly, IL-33 induced eosinophil activation via two distinct mechanisms, IL-4 independent and IL-4 secretion/autostimulation dependent. Anti-IL-4 or anti-IL-4Rα Ab-treated cultured and mature eosinophils, as well as Il4- or Stat6-deficient cultured eosinophils, had attenuated protein secretion of a subset of IL-33-induced genes, including Retnla and Ccl17. Additionally, IL-33 induced the rapid release of preformed IL-4 protein from eosinophils by a NF-κB-dependent mechanism. However, the induction of most IL-33-regulated transcripts (e.g., Il6 and Il13) was IL-4 independent and blocked by NF-κB inhibition. In conclusion, we have identified a novel activation pathway in murine eosinophils that is induced by IL-33 and differentially dependent upon an IL-4 auto-amplification loop.
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Affiliation(s)
- Carine Bouffi
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
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Kano G, Almanan M, Bochner BS, Zimmermann N. Mechanism of Siglec-8-mediated cell death in IL-5-activated eosinophils: role for reactive oxygen species-enhanced MEK/ERK activation. J Allergy Clin Immunol 2013; 132:437-45. [PMID: 23684072 DOI: 10.1016/j.jaci.2013.03.024] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 03/11/2013] [Accepted: 03/19/2013] [Indexed: 01/10/2023]
Abstract
BACKGROUND Sialic acid-binding immunoglobulin-like lectin (Siglec)-8 is expressed on human eosinophils, where its ligation induces cell death. Paradoxically, Siglec-8-mediated cell death is markedly enhanced by the presence of the activation and survival factor IL-5 and becomes independent of caspase activity. OBJECTIVE In this report we investigate the mechanism of Siglec-8-mediated cell death in activated eosinophils. METHODS Human peripheral blood eosinophils were treated with agonistic anti-Siglec-8 antibody and IL-5, and cell death was determined by using flow cytometry and morphology. Phosphorylation of mitogen-activated protein kinase (MAPK) was determined by using phosphoLuminex, flow cytometry, and Western blotting. Reactive oxygen species (ROS) accumulation was determined by using dihydrorhodamine fluorescence. RESULTS Costimulation with anti-Siglec-8 and IL-5 significantly increased the rate and proportion of cell death by means of necrosis accompanied by granule release compared with that seen after stimulation with anti-Siglec-8 alone, in which apoptosis predominated. Together with the caspase-independent mode of cell death in costimulated cells, these findings suggest the activation of a specific and distinct biochemical pathway of cell death during anti-Siglec-8/IL-5 costimulation. Phosphorylation of extracellular signal-regulated kinase (ERK) 1/2 and MAPK-ERK kinase (MEK) 1 was significantly enhanced and sustained in costimulated cells compared with that seen in cells stimulated with IL-5 alone; anti-Siglec-8 alone did not cause ERK1/2 phosphorylation. MEK1 inhibitors blocked anti-Siglec-8/IL-5-induced cell death. ROS accumulation was induced by Siglec-8 ligation in a MEK-independent manner. In contrast, an ROS inhibitor prevented the anti-Siglec-8/IL-5-induced enhancement of ERK phosphorylation and cell death. Exogenous ROS mimicked stimulation by anti-Siglec-8 and was sufficient to induce enhanced cell death in IL-5-treated cells. Collectively, these data suggest that the enhancement of ERK phosphorylation is downstream of ROS generation. CONCLUSIONS In activated eosinophils ligation of Siglec-8 leads to ROS-dependent enhancement of IL-5-induced ERK phosphorylation, which results in a novel mode of biochemically regulated eosinophil cell death.
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Affiliation(s)
- Gen Kano
- Division of Allergy and Immunology, Cincinnati Children's Hospital, and the Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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Abstract
CD22 is a 140-kDa member of the Siglec family of cell surface proteins that is expressed by most mature B-cell lineages. As a co-receptor of the B-cell receptor (BCR), it is known to contribute to the sensitive control of the B-cell response to antigen. Cross-linking of CD22 and the BCR by antigen triggers the phosphorylation of CD22, which leads to activation of signaling molecules such as phosphatases. Signal transduction pathways involving CD22 have been explored in a number of mouse models, some of which have provided evidence that in the absence of functional CD22, B cells have a "hyperactivated" phenotype, and suggest that loss of CD22 function could contribute to the pathogenesis of autoimmune diseases. Modulating CD22 activity has therefore been suggested as a possible therapeutic approach to such diseases. For example, the novel CD22-targeting monoclonal antibody epratuzumab is currently under investigation as a treatment for the connective tissue disorder systemic lupus erythematosus (SLE).
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Affiliation(s)
- Thomas Dörner
- Charité University Medicine Berlin, CC12, Dept. Medicine/Rheumatology and Clinical Immunology and German Rheumatism Research Center Berlin (DRFZ), Berlin, Germany.
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Lee JJ, Jacobsen EA, Ochkur SI, McGarry MP, Condjella RM, Doyle AD, Luo H, Zellner KR, Protheroe CA, Willetts L, Lesuer WE, Colbert DC, Helmers RA, Lacy P, Moqbel R, Lee NA. Human versus mouse eosinophils: "that which we call an eosinophil, by any other name would stain as red". J Allergy Clin Immunol 2012; 130:572-84. [PMID: 22935586 DOI: 10.1016/j.jaci.2012.07.025] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 07/25/2012] [Accepted: 07/25/2012] [Indexed: 12/20/2022]
Abstract
The respective life histories of human subjects and mice are well defined and describe a unique story of evolutionary conservation extending from sequence identity within the genome to the underpinnings of biochemical, cellular, and physiologic pathways. As a consequence, the hematopoietic lineages of both species are invariantly maintained, each with identifiable eosinophils. This canonical presence nonetheless does not preclude disparities between human and mouse eosinophils, their effector functions, or both. Indeed, many books and reviews dogmatically highlight differences, providing a rationale to discount the use of mouse models of human eosinophilic diseases. We suggest that this perspective is parochial and ignores the wealth of available studies and the consensus of the literature that overwhelming similarities (and not differences) exist between human and mouse eosinophils. The goal of this review is to summarize this literature and in some cases provide experimental details comparing and contrasting eosinophils and eosinophil effector functions in human subjects versus mice. In particular, our review will provide a summation and an easy-to-use reference guide to important studies demonstrating that although differences exist, more often than not, their consequences are unknown and do not necessarily reflect inherent disparities in eosinophil function but instead species-specific variations. The conclusion from this overview is that despite nominal differences, the vast similarities between human and mouse eosinophils provide important insights as to their roles in health and disease and, in turn, demonstrate the unique utility of mouse-based studies with an expectation of valid extrapolation to the understanding and treatment of patients.
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Affiliation(s)
- James J Lee
- Division of Pulmonary Medicine, Department of Biochemistry and Molecular Biology, Mayo Clinic Arizona, Scottsdale, AZ, USA.
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Kawata K, Illarionov P, Yang GX, Kenny TP, Zhang W, Tsuda M, Ando Y, Leung PSC, Ansari AA, Gershwin ME. Mincle and human B cell function. J Autoimmun 2012; 39:315-22. [PMID: 22698596 DOI: 10.1016/j.jaut.2012.04.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 04/03/2012] [Accepted: 04/15/2012] [Indexed: 01/04/2023]
Abstract
C-type lectin receptors are pattern recognition receptors that are critical for autoimmunity and the immune response. Mincle is a C-type lectin receptor expressed by a variety of antigen presenting cells including macrophages, neutrophils, dendritic cells and B cells; a variety of stimuli including stress are known to induce the expression of Mincle. Mincle is an FcRγ-associated activation receptor that senses damaged cells and upon ligation induces activated macrophages to produce inflammatory cytokines. Recently, while several studies have reported that Mincle plays an important role in macrophage responses to fungal infection its function on B cells remains to be defined. In efforts to elucidate the function of Mincle expressed by B cells, we studied the expression of Mincle on subsets of B cells and analyzed cytokines and synthesized immunoglobulin upon ligation of Mincle. The expression of Mincle on CD27-CD19(+) naïve B cells is significantly higher than CD27 + CD19(+) memory B cells. The stimulation of TLR9 ligand induced Mincle expression on B cells. Furthermore, co-stimulation of TLR9 and Mincle ligand reduced IgG and IgA production from B cells without a significant change in the inflammatory cytokines TNF-α, IL-6, IL-8 and IL-10. Our data identifies Mincle as a potentially critical player in human B cell responses.
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Affiliation(s)
- Kazuhito Kawata
- Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis School of Medicine, Davis, 95616 CA, USA
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