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The Immune Mechanisms of Severe Equine Asthma-Current Understanding and What Is Missing. Animals (Basel) 2022; 12:ani12060744. [PMID: 35327141 PMCID: PMC8944511 DOI: 10.3390/ani12060744] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 03/11/2022] [Accepted: 03/14/2022] [Indexed: 01/27/2023] Open
Abstract
Severe equine asthma is a chronic respiratory disease of adult horses, occurring when genetically susceptible individuals are exposed to environmental aeroallergens. This results in airway inflammation, mucus accumulation and bronchial constriction. Although several studies aimed at evaluating the genetic and immune pathways associated with the disease, the results reported are inconsistent. Furthermore, the complexity and heterogeneity of this disease bears great similarity to what is described for human asthma. Currently available studies identified two chromosome regions (ECA13 and ECA15) and several genes associated with the disease. The inflammatory response appears to be mediated by T helper cells (Th1, Th2, Th17) and neutrophilic inflammation significantly contributes to the persistence of airway inflammatory status. This review evaluates the reported findings pertaining to the genetical and immunological background of severe equine asthma and reflects on their implications in the pathophysiology of the disease whilst discussing further areas of research interest aiming at advancing treatment and prognosis of affected individuals.
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2
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Karagianni AE, Lisowski ZM, Hume DA, Scott Pirie R. The equine mononuclear phagocyte system: The relevance of the horse as a model for understanding human innate immunity. Equine Vet J 2020; 53:231-249. [PMID: 32881079 DOI: 10.1111/evj.13341] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 07/07/2020] [Accepted: 08/13/2020] [Indexed: 12/11/2022]
Abstract
The mononuclear phagocyte system (MPS) is a family of cells of related function that includes bone marrow progenitors, blood monocytes and resident tissue macrophages. Macrophages are effector cells in both innate and acquired immunity. They are a major resident cell population in every organ and their numbers increase in response to proinflammatory stimuli. Their function is highly regulated by a wide range of agonists, including lymphokines, cytokines and products of microorganisms. Macrophage biology has been studied most extensively in mice, yet direct comparisons of rodent and human macrophages have revealed many functional differences. In this review, we provide an overview of the equine MPS, describing the variation in the function and phenotype of macrophages depending on their location and the similarities and differences between the rodent, human and equine immune response. We discuss the use of the horse as a large animal model in which to study macrophage biology and pathological processes shared with humans. Finally, following the recent update to the horse genome, facilitating further comparative analysis of regulated gene expression between the species, we highlight the importance of future transcriptomic macrophage studies in the horse, the findings of which may also be applicable to human as well as veterinary research.
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Affiliation(s)
- Anna E Karagianni
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, UK
| | - Zofia M Lisowski
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, UK
| | - David A Hume
- Mater Research Institute-UQ, Translational Research Institute, Woolloongabba, QLD, Australia
| | - R Scott Pirie
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, UK
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3
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Logotheti S, Pützer BM. STAT3 and STAT5 Targeting for Simultaneous Management of Melanoma and Autoimmune Diseases. Cancers (Basel) 2019; 11:cancers11101448. [PMID: 31569642 PMCID: PMC6826843 DOI: 10.3390/cancers11101448] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 09/16/2019] [Accepted: 09/23/2019] [Indexed: 02/07/2023] Open
Abstract
Melanoma is a skin cancer which can become metastatic, drug-refractory, and lethal if managed late or inappropriately. An increasing number of melanoma patients exhibits autoimmune diseases, either as pre-existing conditions or as sequelae of immune-based anti-melanoma therapies, which complicate patient management and raise the need for more personalized treatments. STAT3 and/or STAT5 cascades are commonly activated during melanoma progression and mediate the metastatic effects of key oncogenic factors. Deactivation of these cascades enhances antitumor-immune responses, is efficient against metastatic melanoma in the preclinical setting and emerges as a promising targeting strategy, especially for patients resistant to immunotherapies. In the light of the recent realization that cancer and autoimmune diseases share common mechanisms of immune dysregulation, we suggest that the systemic delivery of STAT3 or STAT5 inhibitors could simultaneously target both, melanoma and associated autoimmune diseases, thereby decreasing the overall disease burden and improving quality of life of this patient subpopulation. Herein, we review the recent advances of STAT3 and STAT5 targeting in melanoma, explore which autoimmune diseases are causatively linked to STAT3 and/or STAT5 signaling, and propose that these patients may particularly benefit from treatment with STAT3/STAT5 inhibitors.
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Affiliation(s)
- Stella Logotheti
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, 18057 Rostock, Germany.
| | - Brigitte M Pützer
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, 18057 Rostock, Germany.
- Department Life, Light & Matter, University of Rostock, 18059 Rostock, Germany.
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4
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Caramori G, Coppolino I, Cannavò MF, Nucera F, Proietto A, Mumby S, Ruggeri P, Adcock IM. Transcription inhibitors and inflammatory cell activity. Curr Opin Pharmacol 2019; 46:82-89. [PMID: 31207387 DOI: 10.1016/j.coph.2019.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/04/2019] [Accepted: 05/15/2019] [Indexed: 12/24/2022]
Abstract
Inflammation is a central feature of asthma and chronic obstructive pulmonary disease (COPD). Despite recent advances in the knowledge of the pathogenesis of asthma and COPD, much more research on the molecular mechanisms of asthma and COPD are needed to aid the logical development of new therapies for these common and important diseases, particularly in COPD where no new effective treatments currently exist. In the future the role of the activation/repression of different transcription factors and the genetic regulation of their expression in asthma and COPD may be an increasingly important aspect of research, as this may be one of the critical mechanisms regulating the expression of different clinical phenotypes and their responsiveness to therapy, particularly to anti-inflammatory drugs.
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Affiliation(s)
- Gaetano Caramori
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy.
| | - Irene Coppolino
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy
| | - Mario Francesco Cannavò
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy
| | - Francesco Nucera
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy
| | - Alfio Proietto
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy
| | - Sharon Mumby
- Airway Disease Section, National Heart and Lung Institute, Imperial College London, UK
| | - Paolo Ruggeri
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Messina, Italy
| | - Ian M Adcock
- Airway Disease Section, National Heart and Lung Institute, Imperial College London, UK
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Lange-Consiglio A, Stucchi L, Zucca E, Lavoie JP, Cremonesi F, Ferrucci F. Insights into animal models for cell-based therapies in translational studies of lung diseases: Is the horse with naturally occurring asthma the right choice? Cytotherapy 2019; 21:525-534. [PMID: 30929991 DOI: 10.1016/j.jcyt.2019.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 02/21/2019] [Accepted: 02/25/2019] [Indexed: 12/15/2022]
Abstract
Human asthma is a widespread disease associated with chronic inflammation of the airways, leading to loss of quality of life, disability and death. Corticosteroid administration is the mainstream treatment for asthmatic patients. Corticosteroids reduce airway obstruction and improve quality of life, although symptoms persist despite treatment in many patients. Moreover, available therapies failed to reverse the lung pathology present in asthma. Animal models, mostly rats and mice, in which the disease is experimentally induced, have been studied to identify new therapeutic targets for human asthma. Alternative animal models could include horses in which naturally occurring asthma could represent an important step to test therapies, potentially designed around mouse studies, before being translated to human testing. Horses naturally suffer from asthma, which has striking parallels with human asthma. Severe equine asthma (SEA) is characterized by reversible bronchospasms and neutrophil accumulation in the lungs immunologically mediated mainly by Th2. Moreover, the pulmonary remodelling that occurs in SEA closely resembles that of human asthma, making the equine model unique for investigation of tissue repair and new therapies. Cell therapy, consisting on mesenchymal stromal cells (MSCs) and derivatives (conditioned medium and extracellular vesicles), could represent a novel therapeutic contribution for tissue regeneration. Cell therapy may prove advantageous over conventional therapy in that it may repair or regenerate the site of injury and reduce the reaction to allergens, rather than simply modulating the inflammatory process.
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Affiliation(s)
- Anna Lange-Consiglio
- Department of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy; Reproduction Unit, Centro Clinico-Veterinario e Zootecnico Sperimentale di Ateneo, Università degli Studi di Milano, Lodi, Italy.
| | - Luca Stucchi
- Equine Medicine Unit, Department of Health, Animal Science and Food Safety, Università degli Studi di Milano, Milano, Italy
| | - Enrica Zucca
- Equine Medicine Unit, Department of Health, Animal Science and Food Safety, Università degli Studi di Milano, Milano, Italy
| | - Jean Pierre Lavoie
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, St-Hyacinthe, QC, Canada
| | - Fausto Cremonesi
- Department of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy; Reproduction Unit, Centro Clinico-Veterinario e Zootecnico Sperimentale di Ateneo, Università degli Studi di Milano, Lodi, Italy
| | - Francesco Ferrucci
- Equine Medicine Unit, Department of Health, Animal Science and Food Safety, Università degli Studi di Milano, Milano, Italy
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Abstract
Neutrophilic bronchiolitis is the primary lesion in asthma-affected horses. Neutrophils are key actors in host defense, migrating toward sites of inflammation and infection, where they act as early responder cells toward external insults. However, neutrophils can also mediate tissue damage in various non-infectious inflammatory processes. Within the airways, these cells likely contribute to bronchoconstriction, mucus hypersecretion, and pulmonary remodeling by releasing pro-inflammatory mediators, including the cytokines interleukin (IL)-8 and IL-17, neutrophil elastase, reactive oxygen species (ROS), and neutrophil extracellular traps (NETs). The mechanisms that regulate neutrophil functions in the tissues are complex and incompletely understood. Therefore, the inflammatory activity of neutrophils must be regulated with exquisite precision and timing, a task achieved through a complex network of mechanisms that regulates neutrophil survival. The discovery and development of compounds that can help regulate ROS, NET formation, cytokine release, and clearance would be highly beneficial in the design of therapies for this disease in horses. In this review, neutrophil functions during inflammation will be discussed followed by a discussion of their contribution to airway tissue injury in equine asthma.
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OX40L induces helper T cell differentiation during cell immunity of asthma through PI3K/AKT and P38 MAPK signaling pathway. J Transl Med 2018; 16:74. [PMID: 29554934 PMCID: PMC5859438 DOI: 10.1186/s12967-018-1436-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 03/05/2018] [Indexed: 02/06/2023] Open
Abstract
Background The aim of this study was to investigate the mechanisms of OX40L in regulating helper T (Th) cells differentiation through phosphoinositide 3-kinase (PI3K)/AKT and p38 mitogen-activated protein kinase signaling pathway in vitro and in vivo experiments. Methods Serum samples of patients with asthma and healthy controls were used to explore the association between OX40L and Th cells. Enzyme-linked immunosorbent assay (ELISA) was used to measure the serum concentrations of OX40L, IL-4, IFN-γ, IL-17 and TGF-β. Flow cytometry method was used to analyze Th1, Th2, Th17 and Treg cells. 3H-thymidine was used to determine the proliferation of T cells. Western Blot was used to detect protein expression and phosphorylation. Immunohistochemistry was used to detect the expression of OX40L in lung tissues. Results OX40L, IL-4, IL-17 increased in patient serum compared to healthy control and in the ovalbumin (OVA)-primed mononuclear cells compared to normal cells, while IFN-γ and TGF-β were decreased. Besides, the OVA-primed CD4+ T cells treated with OX40L-Ig fusion protein promoted the proliferation of T cells and Th2 and Th17 cells differentiation as well as PI3K/AKT and p38 MAPK signaling pathway, but suppressed Th1 and Treg cells differentiation. Moreover, helper T cells differentiation in OVA-primed CD4+ T cells could be markedly reversed by the addition of PI3K/AKT inhibition, p38 MAPK inhibition and anti-OX40L monoclonal antibody. Conclusions In this study, we revealed that OX40L could regulate differentiation of helper T cells via PI3K/AKT and p38 MAPK signaling pathway in asthma. Besides, blockade of OX40/OX40L could inhibit the proliferation of CD4+ T cells and regulate polarization of helper T cells. Electronic supplementary material The online version of this article (10.1186/s12967-018-1436-4) contains supplementary material, which is available to authorized users.
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Tessier L, Côté O, Clark ME, Viel L, Diaz-Méndez A, Anders S, Bienzle D. Impaired response of the bronchial epithelium to inflammation characterizes severe equine asthma. BMC Genomics 2017; 18:708. [PMID: 28886691 PMCID: PMC5591550 DOI: 10.1186/s12864-017-4107-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 09/01/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Severe equine asthma is a naturally occurring lung inflammatory disease of mature animals characterized by neutrophilic inflammation, bronchoconstriction, mucus hypersecretion and airway remodeling. Exacerbations are triggered by inhalation of dust and microbial components. Affected animals eventually are unable of aerobic performance. In this study transcriptomic differences between asthmatic and non-asthmatic animals in the response of the bronchial epithelium to an inhaled challenge were determined. RESULTS Paired endobronchial biopsies were obtained pre- and post-challenge from asthmatic and non-asthmatic animals. The transcriptome, determined by RNA-seq and analyzed with edgeR, contained 111 genes differentially expressed (DE) after challenge between horses with and without asthma, and 81 of these were upregulated. Genes involved in neutrophil migration and activation were in central location in interaction networks, and related gene ontology terms were significantly overrepresented. Relative abundance of specific gene products as determined by immunohistochemistry was correlated with differential gene expression. Gene sets involved in neutrophil chemotaxis, immune and inflammatory response, secretion, blood coagulation and apoptosis were overrepresented among up-regulated genes, while the rhythmic process gene set was overrepresented among down-regulated genes. MMP1, IL8, TLR4 and MMP9 appeared to be the most important proteins in connecting the STRING protein network of DE genes. CONCLUSIONS Several differentially expressed genes and networks in horses with asthma also contribute to human asthma, highlighting similarities between severe human adult and equine asthma. Neutrophil activation by the bronchial epithelium is suggested as the trigger of the inflammatory cascade in equine asthma, followed by epithelial injury and impaired repair and differentiation. Circadian rhythm dysregulation and the sonic Hedgehog pathway were identified as potential novel contributory factors in equine asthma.
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Affiliation(s)
- Laurence Tessier
- Department of Pathobiology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Olivier Côté
- Department of Pathobiology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.,Present address: BioAssay Works LLC, 10075 Tyler Place, Suite 18, Ijamsville, MD, 21754, USA
| | - Mary Ellen Clark
- Department of Pathobiology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Laurent Viel
- Department of Clinical Studies, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Andrés Diaz-Méndez
- Department of Clinical Studies, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.,Present address: Centre for Equine Infectious Disease, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Simon Anders
- Institute for Molecular Medicine, Finland (FIMM), University of Helsinki, Tukholmankatu 8, 00014, Helsinki, Finland
| | - Dorothee Bienzle
- Department of Pathobiology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.
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Saeedfar K, Behmanesh M, Mortaz E, Masjedi MR. The Expression of STAT3 and STAT5A Genes in Severe Refractory Asthma. TANAFFOS 2017; 16. [PMID: 28638418 PMCID: PMC5473377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND Despite being a high burden disorder, the pathogenesis of severe refractory asthma (SRA) is poorly understood. There are some evidences for the involvement of members of the signal transducer and activator of transcription (STAT) family, including STAT3 and STAT5a. Our study aimed to evaluate the gene expression of STAT3 and STAT5a in asthma and SRA to establish if there is an association. MATERIALS AND METHODS Using quantitative real-time polymerase chain reactions (qRT-PCR), the transcript levels of STAT3 and STAT5a were evaluated in peripheral blood mononuclear lymphocytes (PBML) isolated from 13 patients with SRA, 14 with mild asthma, and 30 healthy volunteers. RESULTS There were no significant differences in STAT3 transcript levels between study groups. There was however a significant difference in STAT5a transcript levels between cases and controls (p-value=0.03). In comparison to healthy controls, the levels of STAT5a were notably lower in patients with mild asthma and significantly least in those with SRA. CONCLUSION Our study found no appreciable association between STAT3 gene expression and either mild asthma or SRA. However, the STAT5a down regulation in asthmatics and especially SRA is a notable finding which denotes on association between STAT5a and different level of asthma.
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Affiliation(s)
- Kayvan Saeedfar
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mehrdad Behmanesh
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran,Correspondence to: Behmanesh M, Address: Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran, Email address:
| | - Esmaeil Mortaz
- Chronic Respiratory Diseases Research Center (CRDRC), National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Impaired Cell Cycle Regulation in a Natural Equine Model of Asthma. PLoS One 2015; 10:e0136103. [PMID: 26292153 PMCID: PMC4546272 DOI: 10.1371/journal.pone.0136103] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 07/29/2015] [Indexed: 12/14/2022] Open
Abstract
Recurrent airway obstruction (RAO) is a common and potentially debilitating lower airway disease in horses, which shares many similarities with human asthma. In susceptible horses RAO exacerbation is caused by environmental allergens and irritants present in hay dust. The objective of this study was the identification of genes and pathways involved in the pathology of RAO by global transcriptome analyses in stimulated peripheral blood mononuclear cells (PBMCs). We performed RNA-seq on PBMCs derived from 40 RAO affected and 45 control horses belonging to three cohorts of Warmblood horses: two half-sib families and one group of unrelated horses. PBMCs were stimulated with hay dust extract, lipopolysaccharides, a recombinant parasite antigen, or left unstimulated. The total dataset consisted of 561 individual samples. We detected significant differences in the expression profiles between RAO and control horses. Differential expression (DE) was most marked upon stimulation with hay dust extract. An important novel finding was a strong upregulation of CXCL13 together with many genes involved in cell cycle regulation in stimulated samples from RAO affected horses, in addition to changes in the expression of several HIF-1 transcription factor target genes. The RAO condition alters systemic changes observed as differential expression profiles of PBMCs. Those changes also depended on the cohort and stimulation of the samples and were dominated by genes involved in immune cell trafficking, development, and cell cycle regulation. Our findings indicate an important role of CXCL13, likely macrophage or Th17 derived, and the cell cycle regulator CDC20 in the immune response in RAO.
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Mazan MR. Update on noninfectious inflammatory diseases of the lower airway. Vet Clin North Am Equine Pract 2015; 31:159-85. [PMID: 25770068 DOI: 10.1016/j.cveq.2014.11.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Inflammatory airway disease and recurrent airway obstruction are 2 nonseptic diseases of the equine respiratory system with a shared cause of exposure to particulate matter. They appear to occupy 2 ends of a spectrum of disease, but are differentiated by history, clinical signs, and response to treatment. Diagnosis can be made by sampling of respiratory fluids and lung function testing. Treatment consists of environmental modification and pharmacologic treatment with systemic or inhaled corticosteroids and bronchodilators.
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Affiliation(s)
- Melissa R Mazan
- Large Animal Department of Clinical Sciences, Cummings School of Veterinary Medicine at Tufts University, 200 Westborough Road, North Grafton, MA 01536, USA.
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12
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Brazil TJ, Dixon PM, Haslett C, Murray J, McGorum BC. Constitutive apoptosis in equine peripheral blood neutrophils in vitro. Vet J 2014; 202:536-42. [PMID: 25239298 PMCID: PMC4274315 DOI: 10.1016/j.tvjl.2014.08.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 08/26/2014] [Accepted: 08/26/2014] [Indexed: 12/02/2022]
Abstract
Equine peripheral blood neutrophils underwent spontaneous time-dependent constitutive apoptosis when aged in culture for up to 36 h. Equine neutrophils undergoing apoptosis develop the structural and functional features of apoptosis observed in many cell types, including human neutrophils. Neutrophils undergoing apoptosis had diminished zymosan activated serum-stimulated chemiluminescence, but maintained responsiveness to phorbol myristate acetate. The constitutive rate of neutrophil apoptosis was promoted by lipopolysaccharide, tumour necrosis factor α and phagocytosis of opsonised ovine erythrocytes, while it was inhibited by dexamethasone and ZAS (a source of C5a). Equine and human neutrophil apoptosis differed in terms of responses to lipopolysaccharide and in the time-dependence of the response to dexamethasone.
The aim of this study was to characterise constitutive apoptosis in equine peripheral blood neutrophils, including assessment of factors that potentially modulate neutrophil survival through alteration of the rate of constitutive apoptosis. Cells underwent spontaneous time-dependent constitutive apoptosis when aged in culture for up to 36 h, developing the structural and functional features of apoptosis observed in many cell types, including human neutrophils. Neutrophils undergoing apoptosis also had diminished zymosan activated serum (ZAS)-stimulated chemiluminescence, but maintained responsiveness to phorbol myristate acetate (PMA). The constitutive rate of equine neutrophil apoptosis was promoted by lipopolysaccharide (LPS), tumour necrosis factor α and phagocytosis of opsonised ovine erythrocytes, while it was inhibited by dexamethasone and ZAS (a source of C5a). Formyl-Met-Leu-Phe, leukotriene B4, platelet activating factor and PMA had no demonstrable effect on equine neutrophil apoptosis. There was a difference between equine and human neutrophil apoptosis in response to LPS and the time-dependence of the response to dexamethasone.
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Affiliation(s)
- Timothy J Brazil
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, University of Edinburgh, Roslin, Midlothian EH25 9RG, UK
| | - Padraic M Dixon
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, University of Edinburgh, Roslin, Midlothian EH25 9RG, UK
| | - Christopher Haslett
- Queen's Medical Research Institute (QMRI), Medical School, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Joanna Murray
- Rayne Laboratory, Medical School, University of Edinburgh, Teviot Place, Edinburgh EH8 9AG, UK
| | - Bruce C McGorum
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, University of Edinburgh, Roslin, Midlothian EH25 9RG, UK.
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Lavoie-Lamoureux A, Martin JG, Lavoie JP. Characterization of arginase expression by equine neutrophils. Vet Immunol Immunopathol 2014; 157:206-13. [DOI: 10.1016/j.vetimm.2013.12.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Revised: 11/01/2013] [Accepted: 12/23/2013] [Indexed: 01/21/2023]
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14
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Niedzwiedz A, Jaworski Z, Tykalowski B, Smialek M. Neutrophil and macrophage apoptosis in bronchoalveolar lavage fluid from healthy horses and horses with recurrent airway obstruction (RAO). BMC Vet Res 2014; 10:29. [PMID: 24460911 PMCID: PMC3903020 DOI: 10.1186/1746-6148-10-29] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 01/22/2014] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Dysregulation of apoptosis has been implicated in a range of diseases including tumors, neurodegenerative and autoimmune diseases, as well as allergic asthma and chronic obstructive pulmonary disease (COPD) in humans. Although it has a different pathophysiology, delayed apoptosis of various inflammatory cells may play a pivotal role in the development of recurrent airway obstruction (RAO) in horses. Reduction of inflammatory cell apoptosis or a dysregulation of this process could lead to chronic inflammation and tissue injury. Therefore, the aim of this study was to investigate the rate of apoptosis and necrosis of neutrophils and macrophages in bronchoalveolar lavage fluid obtained from seven horses suffering from RAO (study group) and seven control horses. RESULTS We demonstrated that neutrophil/macrophage apoptosis is altered in RAO-affected horses compared with the control group in the BAL fluid. We found a significant difference between the median percentage of early and late apoptosis of neutrophils between the study and control group of horses. Moreover, we found a positive correlation between the rate of apoptosis and the median percentage of macrophages in RAO-affected horses. CONCLUSION The findings suggest that apoptosis dysregulation may play a significant role in the pathogenesis of RAO. However, further studies are needed to clarify the role of altered apoptosis in the course of equine recurrent airway obstruction.
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Affiliation(s)
- Artur Niedzwiedz
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, The Faculty of Veterinary Medicine, Wrocław University of Environmental and Life Sciences, Pl, Grunwaldzki 47, Wrocław 50-366, Poland.
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15
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Gardner A, Borthwick LA, Fisher AJ. Lung epithelial wound healing in health and disease. Expert Rev Respir Med 2014; 4:647-60. [DOI: 10.1586/ers.10.62] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Chhabra JK, Chattopadhyay B, Paul BN. SOCS3 dictates the transition of divergent time-phased events in granulocyte TNF-α signaling. Cell Mol Immunol 2013; 11:105-6. [PMID: 24037182 DOI: 10.1038/cmi.2013.36] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 07/02/2013] [Accepted: 07/04/2013] [Indexed: 11/09/2022] Open
Abstract
Tumor-necrosis factor-α (TNF-α)-driven nuclear factor-κB (NF-κB) activation and apoptosis are opposing pathways; the growing recognition of these conflicting roles of TNF-α is perplexing. Here, we show that inflammation and apoptosis are time-phased events following TNF-α signaling and that emergence of suppressor of cytokine signaling 3 (SOCS3) expression limits the ongoing NF-κB activation and promotes apoptosis; further, we suggest an altered view of how inflammatory diseases are initiated and sustained. In vitro, TNF-α (50 ng/ml) induced granulocyte SOCS3 protein, inhibited nuclear accumulation of the p65NF-κB subunit and enhanced apoptosis, as shown by DNA laddering, annexin V positivity, and overexpression of caspase-3 and Bax in the late phase, whereas the early phase was marked by NF-κB activation. Conversely, SOCS3 knockdown by small interfering RNA (siRNA) inhibited granulocyte apoptosis and enhanced nuclear accumulation of p65 and 5' lipooxygenase expression in the late phase of TNF-α signaling. As apoptosis is associated with SOCS3 abundance, we suggest that these divergent TNF-α-driven events are time-phased, interconnected, opposing control mechanisms and one of the central features through which the immune system resolves pulmonary inflammation. Dysregulation may initiate mucosal inflammation, thus changing the landscape of asthma therapy.
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Affiliation(s)
- Jasmeet Kaur Chhabra
- Immunobiology Division, CSIR-Indian Institute of Toxicology Research, Lucknow, India
| | | | - Bhola Nath Paul
- Immunobiology Division, CSIR-Indian Institute of Toxicology Research, Lucknow, India
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17
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Sarmiento J, Perez B, Morales N, Henriquez C, Vidal L, Folch H, Galecio JS, Morán G. Apoptotic effects of tamoxifen on leukocytes from horse peripheral blood and bronchoalveolar lavage fluid. Vet Res Commun 2013; 37:333-8. [PMID: 23846832 DOI: 10.1007/s11259-013-9571-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/21/2013] [Indexed: 11/26/2022]
Abstract
A reduction in inflammatory cell apoptosis is an important concept in the maintenance of inflammation and a potential target for the resolution of inflammation in many inflammatory diseases. Dysregulation of apoptosis has been implicated in a range of diseases, including tumors, neurodegenerative disorders and autoimmunity, and may also be implicated in allergic asthma. In horses, recurrent airway obstruction (RAO) is an asthma-like condition that is characterized increased survival neutrophil bronchial. Tamoxifen is a synthetic, non-steroidal, anti-estrogen agent that is widely used for treating all stages of breast cancer and has been approved for the prevention of breast cancer in high-risk women. The observed efficacy of tamoxifen has been attributed to both growth arrest and the induction of apoptosis. Therefore, the aim of our study was to evaluate the ability of tamoxifen to induce apoptosis in vitro in granulocytic cells from peripheral blood and in mononuclear cells from bronchoalveolar lavage fluid (BALF) in horses. Flow cytometry using commercial AnnexinV-FITC and propidium iodide was used to quantify early and late apoptotic leukocytes, respectively. The results showed a significant increase in early apoptosis in peripheral blood and bronchial granulocytic cells treated with tamoxifen. The rate of early apoptosis of mononuclear cells from blood and BALF when incubated with tamoxifen was significantly lower compared with granulocytic cells. We did not observe a direct effect of tamoxifen on late apoptosis in any of the in vitro assays in the cell types used here. These results indicate that the apoptotic mechanisms under these experimental conditions would affect only blood and BALF granulocytic cells, particularly in early apoptosis. Finally, further in vitro and in vivo studies are needed to better understand apoptotic mechanisms because tamoxifen could be used to treat chronic, inflammatory pathologies associated with granulocytes and allergic diseases, such as asthma or equine RAO.
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Affiliation(s)
- J Sarmiento
- Department of Phisiology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile
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18
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Lin WC, Schmidt JW, Creamer BA, Triplett AA, Wagner KU. Gain-of-function of Stat5 leads to excessive granulopoiesis and lethal extravasation of granulocytes to the lung. PLoS One 2013; 8:e60902. [PMID: 23565285 PMCID: PMC3614894 DOI: 10.1371/journal.pone.0060902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 03/05/2013] [Indexed: 11/25/2022] Open
Abstract
The Signal Transducer and Activator of Transcription 5 (Stat5) plays a significant role in normal hematopoiesis and a variety of hematopoietic malignancies. Deficiency in Stat5 causes impaired cytokine-mediated proliferation and survival of progenitors and their differentiated descendants along major hematopoietic lineages such as erythroid, lymphoid, and myeloid cells. Overexpression and persistent activation of Stat5 are sufficient for neoplastic transformation and development of multi-lineage leukemia in a transplant model. Little is known, however, whether a continuous activation of this signal transducer is essential for the maintenance of hematopoietic malignancies. To address this issue, we developed transgenic mice that express a hyperactive mutant of Stat5 in hematopoietic progenitors and derived lineages in a ligand-controlled manner. In contrast to the transplant model, expression of mutant Stat5 did not adversely affect normal hematopoiesis in the presence of endogenous wildtype Stat5 alleles. However, the gain-of-function of this signal transducer in mice that carry Stat5a/b hypomorphic alleles resulted in abnormally high numbers of circulating granulocytes that caused severe airway obstruction. Downregulation of hyperactive Stat5 in diseased animals restored normal granulopoiesis, which also resulted in a swift clearance of granulocytes from the lung. Moreover, we demonstrate that Stat5 promotes the initiation and maintenance of severe granulophilia in a cell autonomous manner. The results of this study show that the gain-of-function of Stat5 causes excessive granulopoiesis and prolonged survival of granulocytes in circulation. Collectively, our findings underline the critical importance of Stat5 in maintaining a normal balance between myeloid and lymphoid cells during hematopoiesis, and we provide direct evidence for a function of Stat5 in granulophilia–associated pulmonary dysfunction.
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Affiliation(s)
- Wan-chi Lin
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Jeffrey W. Schmidt
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Bradley A. Creamer
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Aleata A. Triplett
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Kay-Uwe Wagner
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- * E-mail:
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Caramori G, Casolari P, Adcock I. Role of transcription factors in the pathogenesis of asthma and COPD. ACTA ACUST UNITED AC 2013; 20:21-40. [PMID: 23472830 DOI: 10.3109/15419061.2013.775257] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Inflammation is a central feature of asthma and chronic obstructive pulmonary disease (COPD). Despite recent advances in the knowledge of the pathogenesis of asthma and COPD, much more research on the molecular mechanisms of asthma and COPD are needed to aid the logical development of new therapies for these common and important diseases, particularly in COPD where no effective treatments currently exist. In the future the role of the activation/repression of different transcription factors and the genetic regulation of their expression in asthma and COPD may be an increasingly important aspect of research, as this may be one of the critical mechanisms regulating the expression of different clinical phenotypes and their responsiveness to therapy, particularly to anti-inflammatory drugs.
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Affiliation(s)
- Gaetano Caramori
- Centro Interdipartimentale per lo Studio delle Malattie Infiammatorie delle Vie Aeree e Patologie Fumo-correlate CEMICEF; formerly named Centro di Ricerca su Asma e BPCO, Sezione di Malattie dell'Apparato Respiratorio, Università di Ferrara, Ferrara, Italy.
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20
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Helson L. Curcumin (diferuloylmethane) delivery methods: a review. Biofactors 2013; 39:21-6. [PMID: 23315886 DOI: 10.1002/biof.1080] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 12/06/2012] [Indexed: 11/07/2022]
Abstract
Curcumin interacts with a large number of extra- and intracellular targets in a biphasic dose-dependent manner. It controls inflammation, oxidative stress, cell survival, cell secretion, homeostasis, and proliferation. Its mechanisms of action are generally directed toward cells that exhibit disordered physiology or blatant mutation-based abnormal states. Optimizing preventative or therapeutic applications require delivering appropriate quantities of curcumin to lesioned cellular targets. Since diseased conditions anatomically are located from topical to systemic sites, efficient application of curcumin requires specific lesion-oriented delivery methods, representatives of which are here reviewed.
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Zhang J, He J, Xia J, Chen Z, Chen X. Delayed apoptosis by neutrophils from COPD patients is associated with altered Bak, Bcl-xl, and Mcl-1 mRNA expression. Diagn Pathol 2012; 7:65. [PMID: 22686245 PMCID: PMC3488503 DOI: 10.1186/1746-1596-7-65] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 03/30/2012] [Indexed: 01/13/2023] Open
Abstract
Background Delayed neutrophil apoptosis may be an important factor in the persistent inflammation associated with chronic obstructive pulmonary disease (COPD). Bcl-2 family proteins are important regulators of neutrophil apoptosis. We determined the mRNA levels of pro-apoptotic Bak and anti-aptototic Bcl-xl and Mcl-1 members of the Bcl-2 family in unstimulated peripheral blood neutrophils from patients with mild to moderate COPD and compared these to neutrophils from healthy controls. Methods Neutrophils were isolated from peripheral blood samples of 47 COPD patients (smokers: N = 24) and 47 healthy controls (smokers: N = 24). Percentages of apoptotic cells were determined at 4, 24, and 36 h for unstimulated neutrophils cultured in vitro. Neutrophil mRNA expression of Bak, Bcl-xl, and Mcl-1 was determined by real-time polymerase chain reaction (PCR). FEV1 (% predicted) and FVC were determined by spirometry and correlations between mRNA levels and lung function parameters were determined. Results The percentages of apoptotic cells among unstimulated neutrophils from COPD patients were significantly lower compared to cells from controls after 4, 24, and 36 h in culture; smoking history had only a minimal effect on these differences. Unstimulated neutrophils from COPD patients had significantly lower Bak mRNA expression and higher expressions of Bcl-xl and Mcl-1 mRNA than cells from healthy controls. Again, smoking history had only a minimal effect on these trends. Bak mRNA expression was significantly positively correlated with both % predicted FEV1 and the FEV1/FVC ratio, while Bcl-xl and Mcl-1 mRNA expressions were significantly negatively correlated with %predicted FEV1 and the FEV1/FVC ratio. Conclusions The genes for pro-apoptotic Bak, and anti-apoptotic Bcl-xl and Mcl-1 may be important in regulating the delayed neutrophil apoptosis observed in COPD, which may contribute to COPD pathogenesis. Virtual Slides The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1605269445677066
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Shakhsi-Niaei M, Klukowska-Rötzler J, Drögemüller C, Swinburne J, Ehrmann C, Saftic D, Ramseyer A, Gerber V, Dolf G, Leeb T. Replication and fine-mapping of a QTL for recurrent airway obstruction in European Warmblood horses. Anim Genet 2012; 43:627-31. [DOI: 10.1111/j.1365-2052.2011.02315.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/02/2011] [Indexed: 11/29/2022]
Affiliation(s)
- M. Shakhsi-Niaei
- Institute of Genetics; Vetsuisse Faculty; University of Bern; Bremgartenstrasse 109a; Berne; 3001; Switzerland
| | - J. Klukowska-Rötzler
- Institute of Genetics; Vetsuisse Faculty; University of Bern; Bremgartenstrasse 109a; Berne; 3001; Switzerland
| | - C. Drögemüller
- Institute of Genetics; Vetsuisse Faculty; University of Bern; Bremgartenstrasse 109a; Berne; 3001; Switzerland
| | - J. Swinburne
- Animal Health Trust; Newmarket; Suffolk; CB8 7UU; UK
| | - C. Ehrmann
- Clinic for Horses; Department of Clinical Veterinary Science; Justus-Liebig-University Giessen; Frankfurter Str. 126; Giessen; 35392; Germany
| | - D. Saftic
- Equine Clinic; Department of Clinical Veterinary Medicine; Vetsuisse Faculty; University of Bern; Länggassstrasse 124; Berne; 3001; Switzerland
| | - A. Ramseyer
- Agroscope ALP-Haras; Avenches; 1580; Switzerland
| | - V. Gerber
- Equine Clinic; Department of Clinical Veterinary Medicine; Vetsuisse Faculty; University of Bern; Länggassstrasse 124; Berne; 3001; Switzerland
| | - G. Dolf
- Institute of Genetics; Vetsuisse Faculty; University of Bern; Bremgartenstrasse 109a; Berne; 3001; Switzerland
| | - T. Leeb
- Institute of Genetics; Vetsuisse Faculty; University of Bern; Bremgartenstrasse 109a; Berne; 3001; Switzerland
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Sandersen C, Olejnik D, Franck T, Neven P, Serteyn D, Art T. Inhalation with NDS27 attenuates pulmonary neutrophilic inflammation in recurrent airway obstruction. Vet Rec 2011; 169:100. [PMID: 21715367 DOI: 10.1136/vr.d2618] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- C Sandersen
- Equine Clinic, University of Liège, Boulevard de Colonster 20, B41, 4000 Liège, Belgium.
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Identification and characterization of β-adrenergic receptors in isolated primary equine tracheal epithelial cells. Pulm Pharmacol Ther 2010; 24:174-81. [PMID: 20601048 DOI: 10.1016/j.pupt.2010.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 06/04/2010] [Accepted: 06/18/2010] [Indexed: 11/23/2022]
Abstract
Responses and functions of airway epithelial cells are stimulated by β₂-agonists via the β₂-adrenergic receptors (β₂-ARs)-G(s)-protein-cAMP-system, thus, affecting airway inflammation such as in asthma and equine recurrent airway obstruction (RAO). Though horses can be used as large animal model for human asthma, evaluation of the expression and functions of the β-AR system in primary equine airway epithelial cells has not been yet carried out. Thus, for the first time, we determined the β-AR density and subtype distribution by [¹²⁵I]-iodocyanopindolol (ICYP) binding, examined β-AR function by cAMP assay as well as their expression by western blot analysis and immunocytochemical staining in primary equine tracheal epithelial cells (ETEC). Cells were collected from 19 horses and cultured subsequently. The specific ICYP binding was saturable and of high affinity: in freshly isolated cells the receptor density (B(max)) and ICYP affinity (K(D)) for β-ARs were 12727 ± 883 binding sites/cell and 31.78 ± 6.57 pM, respectively, and in cultured ETEC 3730 ± 212 binding sites/cell and 15.26 ± 3.37 pM, respectively. The β-AR subtype assessed by β₁-selective (CGP 20712A) and β₂-selective (ICI 118.551) adrenergic receptor antagonists demonstrated that the β₂-AR subtype predominated (>95%) in both cell populations (p < 0.001). The β-AR agonists increased cAMP formation with a rank order of potency: isoproterenol > epinephrine > norepinephrine. ICI 118.551 (100 nM) significantly blocked (p < 0.05) isoproterenol-induced cAMP accumulation but not CGP 20712A (300 nM). Western blot analyses and immunocytochemical staining further indicated the expression of the β(2)-AR subtype in both cell preparations. Our data indicate that in acutely dissociated and primary cultured ETEC the β(2)-AR-AC system is expressed, but varies considerably between the two preparations.
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25
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Role of arginine metabolism in immunity and immunopathology. Immunobiology 2007; 212:795-812. [PMID: 18086380 DOI: 10.1016/j.imbio.2007.09.008] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Accepted: 09/28/2007] [Indexed: 12/22/2022]
Abstract
A heterogeneous set of cells that are commonly grouped as "myeloid cells", interacts in a complex landscape of physiological and pathological situations. In this review we attempt to trace a profile of the "myeloid connection" through different normal and pathological states, by analyzing common metabolic pathways of the amino acid l-arginine. Myeloid cells exert various, often divergent, actions on the immune response through mechanisms that exploit mediators of this peculiar metabolic pathway, ranging from l-arginine itself to its downstream metabolites, like nitric oxide and polyamines. Various pathological situations, including neoplastic and autoimmune diseases, as well as injury repair and infections are discussed here, showing how l-arginine metabolism is able to play a dual role, both as an active protector and a possible threat to the organism.
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26
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Holguin F, Rojas M, Hart CM. The peroxisome proliferator activated receptor gamma (PPARgamma) ligand rosiglitazone modulates bronchoalveolar lavage levels of leptin, adiponectin, and inflammatory cytokines in lean and obese mice. Lung 2007; 185:367-72. [PMID: 17909895 DOI: 10.1007/s00408-007-9035-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2007] [Accepted: 08/02/2007] [Indexed: 11/27/2022]
Abstract
Obese mice that lack leptin receptor (db (-) /db (-)) have been shown to have innate bronchial hyperresponsiveness (BHR). It has been proposed that the obesity-mediated BHR may involve a combination of increased leptin and reduced systemic adiponectin levels. The aim of this study was to determine if obesity modifies the airway concentration of leptin and adiponectin and whether treatment with a synthetic peroxisome proliferator-activated receptor gamma (PPARgamma) ligand can reduce airway leptin and increase airway adiponectin. In this study, obese, leptin receptor-deficient (db (-) /db (-)), or lean (db ( + ) /db (-)) mice were treated with rosiglitazone (3 mg/kg/day) or vehicle by gavage daily for 1 week. Bronchioalveolar lavage (BAL) was subsequently performed to determine levels of leptin, adiponectin, and inflammatory cytokines. Treatment with rosiglitazone increased BAL adiponectin levels in lean (p = 0.04) and to a lesser extent in obese mice (p = 0.07). Rosiglitazone treatment lowered leptin levels in lean mice, but increased leptin levels in BAL fluid of obese mice (p < 0.01). The BAL levels of granulocyte-macrophage colony-stimulating factor (GM-CSF) were lower in the lean rosiglitazone-treated group compared with the obese vehicle-treated group and lower in the obese rosiglitazone-treated group compared with the obese vehicle-treated group. These results demonstrate that obesity is associated with alterations in adipokine and cytokine levels in the airways that can be modulated by treatment with roziglitazone.
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Affiliation(s)
- Fernando Holguin
- Emory University and the Atlanta Veterans Affairs Medical Center, Atlanta, Georgia 30308, USA.
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27
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Deaton CM, Deaton L, Jose-Cunilleras E, Vincent TL, Baird AW, Dacre K, Marlin DJ. Early onset airway obstruction in response to organic dust in the horse. J Appl Physiol (1985) 2007; 102:1071-7. [PMID: 17158251 DOI: 10.1152/japplphysiol.00264.2006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Equine recurrent airway obstruction (RAO) has been used as a naturally occurring model of human asthma. However, it is unknown whether there is an early-phase response in RAO. The aim of this study was to determine whether exposure to organic dust induces immediate changes in lung function in RAO-affected horses, which could be mediated by airway mast cells. Six RAO-affected horses in remission and six control horses were challenged with hay-straw dust suspension by nebulization. Total respiratory resistance at 1 Hz, measured by forced oscillation, was increased from 0.62 ± 0.09 cmH2O·l−1·s (mean ± SE) to 1.23 ± 0.20 cmH2O·l−1·s 15 min after nebulization in control horses ( P = 0.023) but did not change significantly in the RAO group. Total respiratory reactance at 1 Hz ( P = 0.005) was significantly lower in the control horses (−0.77 ± 0.07 cmH2O·l−1·s) than in the RAO group (−0.49 ± 0.04 cmH2O·l−1·s) 15 min after nebulization. Bronchoalveolar lavage fluid (BALF) histamine concentration was significantly elevated 10 and 20 min postnebulization in control horses but not in RAO horses. Minimum reactance at 1 Hz in the early postnebulization period significantly correlated with both prechallenge BALF mast cell numbers ( r = −0.65, P = 0.02) and peak BALF histamine concentration postnebulization ( r = −0.61, P = 0.04). In conclusion, RAO horses, unlike human asthmatic patients, do not exhibit an early-phase response. However, healthy control horses do demonstrate a mild but significant early (<20 min) phase response to inhaled organic dust. This response may serve to decrease the subsequent dose of dust inhaled and as such provide a protective mechanism, which may be compromised in RAO horses.
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Affiliation(s)
- Christopher M Deaton
- Dept. of Physiology, Animal Health Trust, Lanwades Park, Kentford, Suffolk CB8 7UU, UK
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Abstract
Equine recurrent airway obstruction (RAO) is a naturally occurring respiratory disease in horses with many similarities to human asthma and, as a result, has been used as an animal model of this disease. Oxidative stress has been demonstrated to occur in a range of respiratory diseases in human beings including asthma. Quantitatively, horses have a greater non-enzymatic antioxidant capacity in the pulmonary epithelial lining fluid compared to human beings due to high ascorbic acid concentrations, which reflects their ability to synthesise ascorbic acid. Consequently, a greater oxidative load is likely to be required to induce oxidative stress in horses compared to human beings. Induction of acute neutrophilic airway inflammation in RAO horses by exposure to organic dust does not result in marked pulmonary oxidative stress. However, with a more prolonged inflammatory response, the antioxidant capacity is depleted and oxidative stress occurs. Despite the clear evidence of oxidative stress in RAO, there is currently limited data linking oxidative stress with a causal role in the development of the pathophysiological features of RAO, namely airway obstruction, airway hyper-responsiveness, airway inflammation and mucus accumulation. However, pathways do exist whereby oxidants could potentially augment the production of important mediators in RAO. Further work is required to ascertain the benefits of antioxidant supplementation in RAO and to determine the role of oxidative stress in the pathogenesis of the disease. Given the similarities with human asthma, results from RAO horses could enhance the understanding of the role of oxidative stress in human asthma.
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Couëtil LL, Chilcoat CD, DeNicola DB, Clark SP, Glickman NW, Glickman LT. Randomized, controlled study of inhaled fluticasone propionate, oral administration of prednisone, and environmental management of horses with recurrent airway obstruction. Am J Vet Res 2006; 66:1665-74. [PMID: 16273895 DOI: 10.2460/ajvr.2005.66.1665] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine whether administration of glucocorticoids provides additional benefits to environmental management of horses with recurrent airway obstruction (RAO). ANIMALS 28 horses with RAO. PROCEDURE Horses were classified as having mild, moderate, or severe RAO. Within each category, horses were randomly assigned to receive inhaled fluticasone propionate, inhaled control substance, or oral administration of prednisone. During the 4-week study, horses were maintained outdoors and fed a pelleted feed. Clinical scores, pulmonary function, results of cytologic examination of bronchoalveolar lavage fluid (BALF), and adrenal gland function were determined before and 2 and 4 weeks after initiation of treatment. RESULTS Clinical score and pulmonary function of all RAO-affected horses improved during the treatment period. After 4 weeks, clinical scores and pulmonary function of horses treated with a glucocorticoid were not different from those for the control treatment. In horses with severe RAO, treatment with fluticasone for 2 weeks resulted in significantly greater improvement in pulmonary function, compared with pulmonary function after treatment with prednisone or the control substance. Treatment with a glucocorticoid for 4 weeks and a low-dust environment did not have any effect on cellular content of BALF Treatment with prednisone for 2 weeks resulted in a significant decrease in serum cortisol concentration, compared with concentrations after administration of fluticasone or the control substance. CONCLUSIONS AND CLINICAL RELEVANCE Environmental management is the most important factor in the treatment of horses with RAO. Early treatment with inhaled fluticasone can help accelerate recovery of horses with severe RAO.
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Affiliation(s)
- Laurent L Couëtil
- Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907, USA
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30
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Couëtil LL, Art T, Moffarts B, Becker M, Mélotte D, Jaspar F, Bureau F, Lekeux P. Effect of Beclomethasone Dipropionate and Dexamethasone Isonicotinate on Lung Function, Bronchoalveolar Lavage Fluid Cytology, and Transcription Factor Expression in Airways of Horses with Recurrent Airway Obstruction. J Vet Intern Med 2006. [DOI: 10.1111/j.1939-1676.2006.tb02875.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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Brazil TJ, Dagleish MP, McGorum BC, Dixon PM, Haslett C, Chilvers ER. Kinetics of pulmonary neutrophil recruitment and clearance in a natural and spontaneously resolving model of airway inflammation. Clin Exp Allergy 2006; 35:854-65. [PMID: 16008670 DOI: 10.1111/j.1365-2222.2005.02231.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Neutrophil apoptosis and phagocytic clearance have been proposed as key determinants affecting the resolution of airway inflammation. Objective To determine the kinetics of neutrophil priming, recruitment, activation and subsequent clearance in a naturally occurring equine disease model of neutrophilic pulmonary inflammation. METHODS AND RESULTS A 5 h mouldy hay/straw challenge in hypersensitive horses induced transient pulmonary dysfunction lasting 4 days. At 24 h circulating neutrophils were primed and displayed delayed rates of spontaneous apoptosis in vitro. Neutrophil numbers in the airspaces peaked at 5 h and then fell abruptly, returning to pre-challenge levels by 4 days. Airspace neutrophils demonstrated increased respiratory burst activity compared with circulating cells and equine neutrophil elastase 2A concentrations increased in parallel with neutrophil numbers indicating in vivo priming and degranulation. The number of apoptotic neutrophils and proportion of alveolar macrophages containing phagocytosed apoptotic neutrophils increased significantly at 24 h and 4 days post-challenge corresponding to the period of most rapid neutrophil clearance. CONCLUSION This is the first demonstration of spontaneous neutrophil apoptosis and phagocytic removal in a natural disease model of airway inflammation and provides critical kinetic data to support the hypothesis that this clearance pathway plays a central role in the resolution of neutrophilic inflammation.
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Affiliation(s)
- T J Brazil
- Wellcome Trust Centre for Research in Comparative Respiratory Medicine, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, Midlothian, Scotland, UK
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Plataki M, Tzortzaki E, Rytila P, Demosthenes M, Koutsopoulos A, Siafakas NM. Apoptotic mechanisms in the pathogenesis of COPD. Int J Chron Obstruct Pulmon Dis 2006; 1:161-71. [PMID: 18046893 PMCID: PMC2706617 DOI: 10.2147/copd.2006.1.2.161] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
COPD is a leading cause of morbidity and mortality, characterized by a chronic abnormal inflammatory response to noxious agents. Apoptosis is a physiologic process, critical to cellular homeostasis, in which cell death follows a programmed sequence of events. Apoptosis has been recognized to play an important role in clinical and experimental models of lung diseases. Abnormal apoptotic events in smokers' and in emphysematous lungs have been shown in epithelial and endotheliallung cells, neutrophils, lymphocytes, and myocytes. Many factors associated with COPD, including cigarette smoke, have the potential to cause apoptosis of alveolar epithelial cells, the main sites of vascular endothelial growth factor (VEGF) production. The decreased expression of VEGF, a known survival factor for endothelial cells, and its receptor, results in lung septal endothelial cell death, leading perhaps to the emphysema observed in COPD. In smokers who develop COPD there is an activation of adaptive immunity, with an infiltration of CD4+ and, especially, CD8 + cells. CD8 + cells are cytotoxic to epithelial cells through the release of granzymes and perforin, which can further induce apoptosis of alveolar cells. Moreover, any reduction in neutrophil apoptosis or dysregulation of macrophage uptake of apoptotic neutrophils could lead to chronic inflammation and tissue injury. Increased rates of T-cell apoptosis may lead to a defective immune response to infective organisms, contributing to the high frequency of infections seen in COPD. Increased apoptosis of skeletal muscle could be responsible for the skeletal muscle atrophy, the main cause of unexplained weight loss in patients with COPD. This paper is a review of the current knowledge on the apoptotic pathways involved in COPD pathogenesis and their interaction with other known contributing factors.
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Affiliation(s)
- Maria Plataki
- Deparment of Thoracic Medicine, Medical School, University of Crete, Heraklion, Greece
| | - Eleni Tzortzaki
- Deparment of Thoracic Medicine, Medical School, University of Crete, Heraklion, Greece
| | - Paula Rytila
- Department of Allergy, Helsinki University Central Hospital, Helsinki, Finland
| | - Makris Demosthenes
- Deparment of Thoracic Medicine, Medical School, University of Crete, Heraklion, Greece
| | | | - Nikolaos M Siafakas
- Deparment of Thoracic Medicine, Medical School, University of Crete, Heraklion, Greece
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Torres R, Picado C, de Mora F. [Use of the mouse to unravel allergic asthma: a review of the pathogenesis of allergic asthma in mouse models and its similarity to the condition in humans]. Arch Bronconeumol 2005; 41:141-52. [PMID: 15766467 DOI: 10.1016/s1579-2129(06)60415-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- R Torres
- Departamento de Farmacología, de Terapéutica y de Toxicología, Universidad Autónoma de Barcelona, Cerdanyola del Vallés, Barcelona, Spain
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Torres R, Picado C, de Mora F. Descubriendo el asma de origen alérgico a través del ratón. Un repaso a la patogenia de los modelos de asma alérgica en el ratón y su similitud con el asma alérgica humana. Arch Bronconeumol 2005. [DOI: 10.1016/s0300-2896(05)70605-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Boutet P, Boulanger D, Gillet L, Vanderplasschen A, Closset R, Bureau F, Lekeux P. Delayed Neutrophil Apoptosis in Bovine Subclinical Mastitis. J Dairy Sci 2004; 87:4104-14. [PMID: 15545372 DOI: 10.3168/jds.s0022-0302(04)73553-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Bovine subclinical mastitis can be defined as a moderated inflammatory disease characterized by a persistent accumulation of neutrophils in milk. As GMCSF-mediated delay of neutrophil apoptosis contributes to the accumulation of inflammatory cells at the site of inflammation in many human diseases, we sought to determine whether subclinical mastitis in cows is also associated with a GMCSF-dependent increase in milk-neutrophil survival. We first addressed the hypothesis that GMCSF delays bovine neutrophil apoptosis by activation of the signal transducer and activator of transcription (STAT) family members STAT3 and STAT5, which are critical regulators of the expression of various Bcl-2 family proteins. Granulocyte-macrophage colony-stimulating factor significantly delayed apoptosis of blood neutrophils obtained from healthy cows. In these cells, GMCSF activated STAT5, but not STAT3, and induced an increase in the mRNA of the antiapoptotic Bcl-2 member, Bcl-xL. Granulocyte-macrophage colony-stimulating factor-dependent STAT5 activation and up-regulation of Bcl-xL mRNA were blocked by the Jak inhibitor, AG-490. This inhibition was associated with abrogation of the prosurvival effect of GMCSF, demonstrating a key role for STAT5 in delayed neutrophil apoptosis. We further found that GMCSF expression was increased in milk cells from cows affected with subclinical mastitis. Neutrophils from these cows demonstrated a significant delay of apoptosis as compared with neutrophils obtained from healthy cows and were unresponsive to GMCSF. Active STAT5 complexes were detected in these neutrophils. Finally, in the presence of AG-490, apoptosis was induced and a time-dependent down-regulation of Bcl-xL mRNA was observed in milk neutrophils from mastitis-affected cows. These results indicate that neutrophil survival is enhanced in milk of subclinical mastitis-affected cows and suggest a role for a GMCSF-activated STAT5 signaling pathway in this phenomenon. This pathway could thus represent a target for the control of persistent accumulation of neutrophils in the bovine mammary gland.
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Affiliation(s)
- P Boutet
- Department of Physiology, University of Liége, Belgium.
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Ainsworth DM, Grünig G, Matychak MB, Young J, Wagner B, Erb HN, Antczak DF. Recurrent airway obstruction (RAO) in horses is characterized by IFN-gamma and IL-8 production in bronchoalveolar lavage cells. Vet Immunol Immunopathol 2004; 96:83-91. [PMID: 14522137 DOI: 10.1016/s0165-2427(03)00142-9] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In horses prone to developing recurrent airway obstruction (RAO), we tested the hypotheses that the cytokine profile in the bronchoalveolar lavage (BAL) cells of affected horses would reflect a polarized Th-2 response; that cytokine and chemokine alterations would occur within 24 h of allergen exposure; and that allergen exposure would induce alterations in the expression of the transcription factor t-bet (t-box-expressed in T-cells). The expression levels of interleukin-4 (IL-4), IL-13, Interferon-gamma (IFN-gamma), t-bet, IL-8 and granulocyte-macrophage colony stimulating factor (GM-CSF) were measured in BAL cells obtained from control and RAO-susceptible horses during an asymptomatic phase and at 24 h and 5 weeks post-stabling and hay exposure. At each sampling time, BAL neutrophil percentages in the RAO-group exceeded controls. In the RAO-group, only IL-13 expression was decreased 2-fold during the asymptomatic phase. No differences in cytokine or chemokine expression were detected during the acute exposure phase. During the chronic phase, IFN-gamma and IL-8 expression levels were 2.5- and 3-fold greater, respectively, in the RAO-group. No other differences in gene expression were detected. We conclude that the cytokine profile of the airway cells does not reflect a polarized Th-2 response; that increases in IFN-gamma result from a t-bet independent pathway and that chemokines from epithelial or interstitial cells may contribute to early neutrophil influx.
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Affiliation(s)
- Dorothy M Ainsworth
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
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Taylor EL, Megson IL, Haslett C, Rossi AG. Nitric oxide: a key regulator of myeloid inflammatory cell apoptosis. Cell Death Differ 2003; 10:418-30. [PMID: 12719719 DOI: 10.1038/sj.cdd.4401152] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Apoptosis of inflammatory cells is a critical event in the resolution of inflammation, as failure to undergo this form of cell death leads to increased tissue damage and exacerbation of the inflammatory response. Many factors are able to influence the rate of apoptosis in neutrophils, eosinophils, monocytes and macrophages. Among these is the signalling molecule nitric oxide (NO), which possesses both anti- and proapoptotic properties, depending on the concentration and flux of NO, and also the source from which NO is derived. This review summarises the differential effects of NO on inflammatory cell apoptosis and outlines potential mechanisms that have been proposed to explain such actions.
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Affiliation(s)
- E L Taylor
- Centre for Inflammation Research, Rayne Laboratory, University of Edinburgh, Medical School, Teviot Place, Edinburgh EH8 9AG, UK.
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Abstract
Heaves, or recurrent airway obstruction (RAO), is a chronic respiratory disease featuring lower airway inflammation, bronchoconstriction, and mucus accumulation. Inhaled organic dusts and T helper 2 type immunologic reactions are involved in the complex pathophysiology of RAO. Clinical signs vary and alternate with remission periods. The diagnosis is often based on history and clinical examination in severe cases, but bronchoalveolar lavage may be useful for the detection of early cases. The most important aspect of treatment is to avoid exposure to allergens. Corticosteroids may be administered systemically or by inhalation in combination with bronchodilators and environmental control.
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Affiliation(s)
- Renaud Léguillette
- Meakins-Christie Laboratories, McGill University, 3626 St. Urbain Street, Montreal, Quebec H2X 2P2, Canada.
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Abstract
Asthma is one of the commonest chronic diseases of affluent societies. The striking increase in prevalence of asthma over recent decades and the rarity of this disease in less affluent populations confirms the importance of environmental factors in the cause of asthma--although which environmental factors are responsible is still not clear. Family studies show that genetic factors are also important in determining individual susceptibility to asthma, with results of genetic studies suggesting that there are many genes with moderate effects rather than a few major genes. Asthmatic airways show inflammation and remodelling, with CD4+ helper cells, mast cells, and eosinophils characterising the inflammatory response. Inhaled corticosteroids remain the cornerstone of treatment with the addition of long-acting beta agonists as the next step if symptoms continue. Leukotriene antagonists, the only new drugs to reach the market in the past decade, have modest effects. However, a better understanding of the mechanisms underlying asthma and the genetic and environmental factors that predispose individuals to asthma should lead to better preventative strategies and new therapeutic approaches.
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Affiliation(s)
- A E Tattersfield
- Division of Respiratory Medicine, Clinical Sciences Building, City Hospital, Nottingham, UK.
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