1
|
Gómez C, Gonzalez-Riano C, Barbas C, Kolmert J, Hyung Ryu M, Carlsten C, Dahlén SE, Wheelock CE. Quantitative metabolic profiling of urinary eicosanoids for clinical phenotyping. J Lipid Res 2019; 60:1164-1173. [PMID: 30842246 DOI: 10.1194/jlr.d090571] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 02/05/2019] [Indexed: 12/12/2022] Open
Abstract
The eicosanoids are a family of lipid mediators of pain and inflammation involved in multiple pathologies, including asthma, hypertension, cancer, atherosclerosis, and neurodegenerative diseases. These signaling mediators act locally, but are rapidly metabolized and transported to the systemic circulation as a mixture of primary and secondary metabolites. Accordingly, urine has become a useful readily accessible biofluid for monitoring the endogenous synthesis of these molecules. Herein, we present the validation of a rapid, repeatable, and precise method for the extraction and quantification of 32 eicosanoid urinary metabolites by LC-MS/MS. For 12 out of 17 deconjugated glucuronide eicosanoids, there was no improvement in recovered signal. These metabolites cover the major synthetic pathways, including prostaglandins, leukotrienes, and isoprostanes. The method linearity was >0.99 for all metabolites analyzed, the limit of detection ranged from 0.05-5 ng/ml, and the average extraction recoveries were >90%. All analytes were stable for at least three freeze/thaw cycles. The method was formatted for large-scale analysis of clinical cohorts, and the long-term repeatability was demonstrated over 15 months of acquisition, evidencing high precision (CV <15%, except for tetranorPGEM and 2,3-dinor-11β-PGF2α, which were <30%). The presented method is suitable for focused mechanistic studies as well as large-scale clinical and epidemiological studies that require repeatable methods capable of producing data that can be concatenated across multiple cohorts.
Collapse
Affiliation(s)
- Cristina Gómez
- Division of Physiological Chemistry 2, Department of Medical Biochemistry and Biophysics Karolinska Institutet, Stockholm, Sweden.,Unit of Lung and Allergy Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Carolina Gonzalez-Riano
- Centre for Metabolomics and Bioanalysis (CEMBIO), Facultad de Farmacia, Universidad CEU San Pablo, Madrid, Spain
| | - Coral Barbas
- Centre for Metabolomics and Bioanalysis (CEMBIO), Facultad de Farmacia, Universidad CEU San Pablo, Madrid, Spain
| | - Johan Kolmert
- Division of Physiological Chemistry 2, Department of Medical Biochemistry and Biophysics Karolinska Institutet, Stockholm, Sweden.,Unit of Lung and Allergy Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Min Hyung Ryu
- Air Pollution Exposure Laboratory, Chan-Yeung Centre for Occupational and Environmental Respiratory Disease, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Christopher Carlsten
- Air Pollution Exposure Laboratory, Chan-Yeung Centre for Occupational and Environmental Respiratory Disease, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Sven-Erik Dahlén
- Unit of Lung and Allergy Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Craig E Wheelock
- Division of Physiological Chemistry 2, Department of Medical Biochemistry and Biophysics Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
2
|
Abstract
Prostaglandins are synthesized through the metabolism of arachidonic acid via the cyclooxygenase pathway. There are five primary prostaglandins, PGD2, PGE2, PGF2, PGI2, and thromboxane B2, that all signal through distinct seven transmembrane, G-protein coupled receptors. The receptors through which the prostaglandins signal determines their immunologic or physiologic effects. For instance, the same prostaglandin may have opposing properties, dependent upon the signaling pathways activated. In this article, we will detail how inhibition of cyclooxygenase metabolism and regulation of prostaglandin signaling regulates allergic airway inflammation and asthma physiology. Possible prostaglandin therapeutic targets for allergic lung inflammation and asthma will also be reviewed, as informed by human studies, basic science, and animal models.
Collapse
Affiliation(s)
- R Stokes Peebles
- Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States.
| |
Collapse
|
3
|
Abstract
The role of platelets as inflammatory cells is now well established. Given the peculiar characteristics of the lung circulation, with a broad capillary bed, platelets are especially involved with the physiology of the lungs and play a key role in a number of inflammatory lung disorders. The platelet precursors, megakaryocytes, are detected in the lung microcirculation; moreover platelets with their endothelium-protective and vascular reparative activities contribute to the lung capillary blood barrier integrity. Given the function of the lungs as first wall against pathogen invasion, platelets participate in immune defence of the normal lung. On the other hand, platelets may turn into effectors of the inflammatory reaction of the lungs to allergens, to infectious agents, to chemical agents and may contribute strongly to the perpetuation of chronic inflammatory reactions, largely by their ability to interact with other inflammatory cells and the endothelium. In this chapter we provide an overview of the role of platelets in several inflammatory lung disorders discussing the pathophysiologic bases of platelet involvement in these conditions and the experimental and clinical evidence for a role of platelets in lung diseases.
Collapse
|
4
|
Pan Y, Li S, Xie X, Li M. Association between thromboxane A2 receptor polymorphisms and asthma risk: A meta-analysis. J Asthma 2016; 53:576-82. [PMID: 27058349 DOI: 10.3109/02770903.2015.1126849] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To determine whether there is an association between thromboxane A2 receptor (TBXA2R) gene polymorphisms (+924C/T and +795C/T) and asthma risk by conducting a meta-analysis. DATA SOURCES Pubmed, Embase, Chinese National Knowledge Infrastructure (CNKI) and Wanfang database were searched (updated May 1, 2015). STUDY SELECTIONS Articles evaluating the association between TBXA2R gene polymorphisms and asthma risk were selected. RESULTS A total of 7 studies on +924C/T polymorphism and 6 studies on +795C/T polymorphism were included in this meta-analysis. There was a significant association between TBXA2R +924C/T polymorphism and asthma risk in the recessive model (OR = 1.33, 95% CI = 1.01-1.75, P = 0.045). No significant association between +795C/T polymorphism and asthma risk in the overall population was demonstrated. In subgroup analyzes, significant association was observed in atopic asthma risk in the recessive model (OR = 1.43, 95% CI = 1.01-2.01, P = 0.043), but no significant association was found between TBXA2R +924C/T polymorphism and asthma risk in Asians (OR = 1.14, 95% CI = 0.80-1.63, P = 0.457). TBXA2R +795C/T polymorphism was associated with aspirin-intolerant asthma (AIA) risk when stratified by asthma subphenotype in the allelic model (OR = 1.30, 95% CI = 1.05-1.60, P = 0.014) and dominant model (OR = 1.50, 95% CI = 1.11-2.03, P = 0.008). CONCLUSION Our results suggested that TBXA2R +924C/T polymorphism is associated with asthma risk, and +795C/T polymorphism may be a risk factor for AIA. Larger-scale and well-designed studies are required to validate the association identified in the current meta-analysis.
Collapse
Affiliation(s)
- Yilin Pan
- a Department of Respiratory Medicine , The First Affiliated Hospital of Xi'an Jiaotong University , Xi'an, Shaanxi , China
| | - Shaojun Li
- a Department of Respiratory Medicine , The First Affiliated Hospital of Xi'an Jiaotong University , Xi'an, Shaanxi , China
| | - Xinming Xie
- a Department of Respiratory Medicine , The First Affiliated Hospital of Xi'an Jiaotong University , Xi'an, Shaanxi , China
| | - Manxiang Li
- a Department of Respiratory Medicine , The First Affiliated Hospital of Xi'an Jiaotong University , Xi'an, Shaanxi , China
| |
Collapse
|
5
|
Säfholm J, Manson ML, Bood J, Delin I, Orre AC, Bergman P, Al-Ameri M, Dahlén SE, Adner M. Prostaglandin E2 inhibits mast cell-dependent bronchoconstriction in human small airways through the E prostanoid subtype 2 receptor. J Allergy Clin Immunol 2015; 136:1232-9.e1. [PMID: 25962903 DOI: 10.1016/j.jaci.2015.04.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 04/01/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Inhaled prostaglandin (PG) E2 might inhibit asthmatic responses, but the mechanisms involved remain undefined. OBJECTIVE We sought to characterize the direct and indirect effects of PGE2 on human small airways with particular reference to the receptors mediating the responses. METHODS Contraction and relaxation were studied in isolated human bronchi with an inner diameter of 1 mm or less. RESULTS Low concentrations of PGE2 (0.01-1 μmol/L) relaxed the bronchi precontracted by histamine. The bronchodilator response was inhibited by the E prostanoid (EP) subtype 4 receptor antagonist ONO-AE3-208 but unaffected by the EP2 receptor antagonist PF-04418948. Higher concentrations of PGE2 (10-100 μmol/L) contracted the small airways. However, the TP receptor agonists U-46,619, PGF2α, and PGD2 were more potent than PGE2. Moreover, the bronchoconstrictor responses to PGE2 and all other tested prostanoids, including the EP1/EP3 receptor agonist 17-phenyl trinor PGE2 and the partial FP receptor agonist AL-8810, were uniformly abolished by the TP receptor antagonist SQ-29,548. In the presence of TP and EP4 antagonists, PGE2 inhibited the mast cell-mediated bronchoconstriction resulting from anti-IgE challenge. Measurement of the release of histamine and cysteinyl leukotrienes documented that this bronchoprotective action of PGE2 was mediated by the EP2 receptor, unrelated to bronchodilation, and increased with time of exposure. CONCLUSION The pharmacology of PGE2 in isolated human small airways was different from its profile in animal models. This first demonstration of powerful EP2 receptor-mediated inhibition of IgE-dependent contractions in human airways introduces a new selective target for the treatment of asthma. This EP2 control of mast cell-mediated bronchoconstriction is presumably exaggerated in patients with aspirin-exacerbated respiratory disease.
Collapse
Affiliation(s)
- Jesper Säfholm
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden.
| | - Martijn L Manson
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Johan Bood
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Ingrid Delin
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Ann-Charlotte Orre
- Department of Cardiothoracic Surgery and Anesthesiology, Karolinska University Hospital, Stockholm, Sweden
| | - Per Bergman
- Department of Cardiothoracic Surgery and Anesthesiology, Karolinska University Hospital, Stockholm, Sweden; Department of Molecular Medicine and Surgery (MMK), Karolinska Institutet, Stockholm, Sweden
| | - Mamdoh Al-Ameri
- Department of Cardiothoracic Surgery and Anesthesiology, Karolinska University Hospital, Stockholm, Sweden
| | - Sven-Erik Dahlén
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Mikael Adner
- Unit for Experimental Asthma and Allergy Research, Institute of Environmental Medicine, and the Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
6
|
Claar D, Hartert TV, Peebles RS. The role of prostaglandins in allergic lung inflammation and asthma. Expert Rev Respir Med 2014; 9:55-72. [PMID: 25541289 DOI: 10.1586/17476348.2015.992783] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Prostaglandins (PGs) are products of the COX pathway of arachidonic acid metabolism. There are five primary PGs, PGD₂, PGE₂, PGF₂, PGI₂ and thromboxane A₂, all of which signal through distinct seven transmembrane, G-protein coupled receptors. Some PGs may counteract the actions of others, or even the same PG may have opposing physiologic or immunologic effects, depending on the specific receptor through which it signals. In this review, we examine the effects of COX activity and the various PGs on allergic airway inflammation and physiology that is associated with asthma. We also highlight the potential therapeutic benefit of targeting PGs in allergic lung inflammation and asthma based on basic science, animal model and human studies.
Collapse
Affiliation(s)
- Dru Claar
- Department of Medicine, Division of Allergy, Pulmonary, and Critical Care Medicine, T-1217 MCN Vanderbilt University Medical Center, Vanderbilt University School of Medicine, Nashville, TN 37232-2650, USA
| | | | | |
Collapse
|
7
|
Effects of selective COX-2 inhibition on allergen-induced bronchoconstriction and airway inflammation in asthma. J Allergy Clin Immunol 2014; 134:306-13. [DOI: 10.1016/j.jaci.2013.12.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 11/04/2013] [Accepted: 12/03/2013] [Indexed: 12/12/2022]
|
8
|
Lipid mediators and allergic diseases. Ann Allergy Asthma Immunol 2013; 111:155-62. [PMID: 23987187 DOI: 10.1016/j.anai.2013.06.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 06/27/2013] [Accepted: 06/27/2013] [Indexed: 12/26/2022]
Abstract
OBJECTIVE To review the basic science and translational relevance of lipid mediators in the pathobiology of allergic diseases. DATA SOURCES PubMed was searched for articles using the key terms lipid mediator, prostaglandin, prostanoid, leukotriene, thromboxane, asthma, and allergic inflammation. STUDY SELECTIONS Articles were selected based on their relevance to the goals of this review. Articles with a particular focus on clinical and translational aspects of basic science discoveries were emphasized. RESULTS Lipid mediators are bioactive molecules generated from cell membrane phospholipids. They play important roles in many disease states, particularly in inflammatory and immune responses. Lipid mediators and their receptors are potentially useful as diagnostic markers of disease and therapeutic targets. CONCLUSIONS Several useful therapeutic agents have been developed based on a growing understanding of the lipid mediator pathways in allergic disease, notably the cysteinyl leukotriene receptor type 1 antagonists and the 5-lipoxygenase inhibitor, zileuton. Additional receptor agonists and antagonists relevant to these pathways are in development, and it is likely that future pharmacologic treatments for allergic disease will become available as our understanding of these molecules continues to evolve.
Collapse
|
9
|
Halwani R, Vazquez-Tello A, Sumi Y, Pureza MA, Bahammam A, Al-Jahdali H, Soussi-Gounni A, Mahboub B, Al-Muhsen S, Hamid Q. Eosinophils induce airway smooth muscle cell proliferation. J Clin Immunol 2012. [PMID: 23180361 DOI: 10.1007/s10875-012-9836-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Asthma is characterized by eosinophilic airway inflammation and remodeling of the airway wall. Features of airway remodeling include increased airway smooth muscle (ASM) mass. However, little is known about the interaction between inflammatory eosinophils and ASM cells. In this study, we investigated the effect of eosinophils on ASM cell proliferation. Eosinophils were isolated from peripheral blood of mild asthmatics and non-asthmatic subjects and co-cultured with human primary ASM cells. ASM proliferation was estimated using Ki-67 expression assay. The expression of extracellular matrix (ECM) mRNA in ASM cells was measured using quantitative real-time PCR. The role of eosinophil derived Cysteinyl Leukotrienes (CysLTs) in enhancing ASM proliferation was estimated by measuring the release of leukotrienes from eosinophils upon their direct contact with ASM cells using ELISA. This role was confirmed either by blocking eosinophil-ASM contact or co-culturing them in the presence of leukotrienes antagonist. ASM cells co-cultured with eosinophils, isolated from asthmatics, but not non-asthmatics, had a significantly higher rate of proliferation compared to controls. This increase in ASM proliferation was independent of their release of ECM proteins but dependent upon eosinophils release of CysLTs. Eosinophil-ASM cell to cell contact was required for CysLTs release. Preventing eosinophil contact with ASM cells using anti-adhesion molecules antibodies, or blocking the activity of eosinophil derived CysLTs using montelukast inhibited ASM proliferation. Our results indicated that eosinophils contribute to airway remodeling during asthma by enhancing ASM cell proliferation and hence increasing ASM mass. Direct contact of eosinophils with ASM cells triggers their release of CysLTs which enhance ASM proliferation. Eosinophils, and their binding to ASM cells, constitute a potential therapeutic target to interfere with the series of biological events leading to airway remodeling and Asthma.
Collapse
Affiliation(s)
- Rabih Halwani
- Asthma Research Chair and Prince Naif Center for Immunology Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Bianco S, Robuschi M, Gambaro G, Spagnotto S, Petrigni G. Bronchial Inflammation and NSAIDs. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/bf03258316] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
11
|
Daham K, Song WL, Lawson JA, Kupczyk M, Gülich A, Dahlén SE, FitzGerald GA, Dahlén B. Effects of celecoxib on major prostaglandins in asthma. Clin Exp Allergy 2010; 41:36-45. [PMID: 20880055 DOI: 10.1111/j.1365-2222.2010.03617.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Prostaglandin (PG) D(2) is a pro-inflammatory and bronchoconstrictive mediator released from mast cells, and is currently evaluated as a new target for treatment of asthma and rhinitis. It is not known which cyclooxygenase (COX) isoenzyme catalyses its biosynthesis in subjects with asthma. OBJECTIVES Primarily, to assess whether treatment with the COX-2 selective inhibitor celecoxib inhibited biosynthesis of PGD(2) , monitored as urinary excretion of its major tetranor metabolite (PGDM). Secondarily, to determine the effects of the treatment on biosynthesis of PGE(2) , thromboxane A(2) and PGI(2) , also measured as major urinary metabolites. METHODS Eighteen subjects with asthma participated in a cross-over study where celecoxib 200mg or placebo were given b.i.d. on 3 consecutive days following 2 untreated baseline days. Six healthy controls received active treatment with the same protocol. Urinary excretion of the eicosanoid metabolites was determined by liquid chromatography/tandem mass spectrometry (LC/MS/MS). Lung function was followed as FEV(1) and airway inflammation as fraction of exhaled nitric oxide (F(E) NO). RESULTS Celecoxib treatment inhibited urinary excretion of PGEM by 50% or more in subjects with asthma and healthy controls, whereas there was no significant change in the excretion of PGDM. In comparison with the healthy controls, the subjects with asthma had higher baseline levels of urinary PGDM but not of PGEM. The 3-day treatment did not cause significant changes in FEV(1) or F(E) NO. CONCLUSION AND CLINICAL RELEVANCE Biosynthesis of PGD(2) was increased in subjects with asthma and its formation is catalysed predominantly by COX-1. By contrast, COX-2 contributes substantially to the biosynthesis of PGE(2) . The asymmetric impact of celecoxib on prostanoid formation raises the possibility of long-term adverse consequences of COX-2 inhibition on airway homeostasis by the decreased formation of bronchodilator PGs and maintained production of increased levels of bronchoconstrictor PGs in asthmatics.
Collapse
Affiliation(s)
- K Daham
- Department of Medicine, Division of Respiratory Medicine and Allergy, Karolinska University Hospital, Huddinge, Sweden
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Abstract
Sheep naturally allergic to Ascaris suum antigen have been used to study the pathophysiology of asthma and more recently allergic rhinitis, chronic obstructive pulmonary disease (COPD) and cystic fibrosis. The utility of the model as it relates to the study of these diseases is discussed.
Collapse
Affiliation(s)
- William M Abraham
- Department of Research, Mount Sinai Medical Center, 4300 Alton Road, Miami Beach, FL 33140, USA.
| |
Collapse
|
13
|
Mita H, Higashi N, Taniguchi M, Higashi A, Akiyama K. Increase in urinary leukotriene B4 glucuronide concentration in patients with aspirin-intolerant asthma after intravenous aspirin challenge. Clin Exp Allergy 2004; 34:1262-9. [PMID: 15298568 DOI: 10.1111/j.1365-2222.2004.02034.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Aspirin challenge of aspirin-intolerant asthma (AIA) patients causes a significant increase in leukotriene E4 (LTE4) concentration in urine. However, knowledge on leukotriene B4 (LTB4) generation in patients with AIA is insufficient. Recent research has demonstrated that exogenously administered LTB4 is excreted as glucuronide into the urine in human healthy subjects. OBJECTIVE The purpose of this study is to estimate urinary LTB4 glucuronide (LTBG) concentration in the clinically stable condition in healthy subjects and asthmatic patients and to investigate changes in urinary LTBG concentration in patients with AIA after aspirin challenge. METHODS A provocation test was performed by intravenous aspirin challenge. After urine was hydrolysed by beta-glucuronidase, the fraction containing LTB4 was purified by high-performance liquid chromatography and LTB4 concentration was quantified by enzyme immunoassay. Urinary LTBG concentration was calculated as the difference between the concentration obtained with hydrolysis and that without hydrolysis. RESULTS (1) After hydrolysis, the presence of urinary LTB4 was verified by gas chromatography-mass spectrometry-selected ion monitoring. (2) The urinary LTBG concentration was significantly higher in the asthmatic patients than in the healthy subjects (median, 5.37 pg/mg creatinine [range 1.2-13] vs. 3.32 pg/mg creatinine [range, 0.14-10.5], P = 0.0159). (3) The patients with AIA (n = 7), but not those with aspirin-tolerant asthma (n = 6), showed significant increases in LTBG and LTE4 excretions after aspirin challenge. (4) When the concentrations after aspirin challenge were analysed simultaneously, a significant linear correlation was observed between urinary LTBG concentration and urinary LTE4 concentration in patients with AIA (Spearman's rank correlation test, r = 0.817, P = 0.0003). CONCLUSION LTBG is present in human urine, albeit at a concentration lower than urinary LTE4. In addition to a marked increase in cysteinyl-leukotriene production, aspirin challenge induced LTB4 production in AIA patients.
Collapse
Affiliation(s)
- H Mita
- Clinical Research Center, National Sagamihara Hospital, Kanagawa, Japan.
| | | | | | | | | |
Collapse
|
14
|
Ramires R, Caiaffa MF, Tursi A, Haeggström JZ, Macchia L. Novel inhibitory effect on 5-lipoxygenase activity by the anti-asthma drug montelukast. Biochem Biophys Res Commun 2004; 324:815-21. [PMID: 15474500 DOI: 10.1016/j.bbrc.2004.09.125] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2004] [Indexed: 10/26/2022]
Abstract
5-Lipoxygenase is the key enzyme in the biosynthesis of leukotrienes, powerful lipid mediators involved in inflammation, cell-cell communication, and other important physiological and pathological conditions. Particularly, cysteinyl-leukotrienes have been recognized as playing a significant role in the pathophysiology of asthma and potent and effective Cys-LT1 receptor antagonists have been developed for the treatment of this illness. Here we report that montelukast, a structural Cys-LT1 receptor antagonist, also exerts a substantial and apparently direct inhibitory effect on 5-lipoxygenase activity in vitro, at concentrations in the lower micromolar range, which are of potential therapeutic relevance. Thus, when human mast cells HMC-1 were stimulated with the Ca ionophore A23187 in the presence of montelukast (up to 100 microM) a substantial decline in 5-lipoxygenase biosynthesis was observed. Similar results were obtained in the rat mast cell-like RBL-1 cell model (IC50 congruent with 2.5 microM) and in human polymorphonuclear leukocytes. Moreover, montelukast directly inhibited human recombinant 5-lipoxygenase. Kinetic experiments revealed that the inhibition was of the non-competitive type, suggesting that montelukast binds a yet undefined allosteric site on 5-lipoxygenase. 5-Lipoxygenase inhibition by montelukast appears to be highly selective since the drug had no effects on other enzymes of the leukotriene cascade, viz. LTC4 synthase and LTA hydrolase.
Collapse
Affiliation(s)
- Rossella Ramires
- Department of Allergology and Clinical Immunology, University of Bari, Bari 70124, Italy
| | | | | | | | | |
Collapse
|
15
|
Rolin S, Dogne JM, Vastersaegher C, Hanson J, Masereel B. Pharmacological evaluation of both enantiomers of (R,S)-BM-591 as thromboxane A2 receptor antagonists and thromboxane synthase inhibitors. Prostaglandins Other Lipid Mediat 2004; 74:75-86. [PMID: 15560117 DOI: 10.1016/j.prostaglandins.2004.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this work is to evaluate the anti-thromboxane activity of two pure enantiomers of (R,S)-BM-591, a nitrobenzene sulfonylurea chemically related to torasemide, a loop diuretic. The drug affinity for thromboxane A2 receptor (TP) of human washed platelets has been determined. In these experiments, (R)-BM-591 (IC50 = 2.4+/-0.1 nM) exhibited a significant higher affinity than (S)-BM-591 (IC50 = 4.2+/-0.15 nM) for human washed platelets TP receptors. Both enantiomers were stronger ligands than SQ-29548 (IC50 = 21.0+/-1.0 nM) and sulotroban (IC50 = 930+/-42 nM), two reference TXA2 receptor antagonists. Pharmacological characterisations of (S)-BM-591 and (R)-BM-591 were compared in several models. Thus, (R)-BM-591 strongly prevented platelet aggregation induced by arachidonic acid (AA) (600 microM) and U-46619 (1 microM) while (S)-BM-591 showed a lower activity. On isolated tissues pre-contracted by U-46619, a stable TXA2 agonist, (S)-BM-591 was more potent in relaxing guinea-pig trachea (EC50 = 0.272+/-0.054 microM) and rat aorta (EC50 = 0.190+/-0.002 microM) than (R)-BM-591 (EC50 of 9.60+/-0.63 microM and 0.390+/-0.052 microM, respectively). Moreover, at 1 microM, (R)-BM-591 totally inhibited TXA2 synthase activity, expressed as TXB2 production from human platelets, while at the same concentration, (S)-BM-591 poorly reduced the TXB2 synthesis (22%). Finally, in rats, both enantiomers lost the diuretic activity of torasemide. In conclusion, (R)-BM-591 exhibits a higher affinity and antagonism on human platelet TP receptors than (S)-BM-591 as well as a better thromboxane synthase inhibitory potency. In contrast, (S)-BM-591 is more active than the (R)-enantiomer in relaxing smooth muscle contraction of rat aorta and trachea guinea pig. Consequently, (R)-BM-591 represents the best candidate for further development in the field of thrombosis disorders.
Collapse
Affiliation(s)
- S Rolin
- Department of Pharmacy, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | | | | | | | | |
Collapse
|
16
|
Simmons DL, Botting RM, Hla T. Cyclooxygenase Isozymes: The Biology of Prostaglandin Synthesis and Inhibition. Pharmacol Rev 2004; 56:387-437. [PMID: 15317910 DOI: 10.1124/pr.56.3.3] [Citation(s) in RCA: 1166] [Impact Index Per Article: 58.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) represent one of the most highly utilized classes of pharmaceutical agents in medicine. All NSAIDs act through inhibiting prostaglandin synthesis, a catalytic activity possessed by two distinct cyclooxygenase (COX) isozymes encoded by separate genes. The discovery of COX-2 launched a new era in NSAID pharmacology, resulting in the synthesis, marketing, and widespread use of COX-2 selective drugs. These pharmaceutical agents have quickly become established as important therapeutic medications with potentially fewer side effects than traditional NSAIDs. Additionally, characterization of the two COX isozymes is allowing the discrimination of the roles each play in physiological processes such as homeostatic maintenance of the gastrointestinal tract, renal function, blood clotting, embryonic implantation, parturition, pain, and fever. Of particular importance has been the investigation of COX-1 and -2 isozymic functions in cancer, dysregulation of inflammation, and Alzheimer's disease. More recently, additional heterogeneity in COX-related proteins has been described, with the finding of variants of COX-1 and COX-2 enzymes. These variants may function in tissue-specific physiological and pathophysiological processes and may represent important new targets for drug therapy.
Collapse
Affiliation(s)
- Daniel L Simmons
- Department of Chemistry and Biochemistry, E280 BNSN, Brigham Young University, Provo, UT 84604, USA.
| | | | | |
Collapse
|
17
|
Green SA, Malice MP, Tanaka W, Tozzi CA, Reiss TF. Increase in urinary leukotriene LTE4 levels in acute asthma: correlation with airflow limitation. Thorax 2004; 59:100-4. [PMID: 14760145 PMCID: PMC1746943 DOI: 10.1136/thorax.2003.006825] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Leukotrienes play a key role in the pathophysiology of chronic asthma. Activation of leukotriene pathways is accompanied by rises in detectable urinary levels of leukotriene E4 (LTE4). The relationship between urinary LTE4 levels and factors associated with acute asthma has not been determined. METHODS Adults aged 15-54 years presenting with moderate to severe acute asthma were evaluated at emergency departments in 16 US sites. Forced expiratory volume in 1 second (FEV1) was measured during the first 60 minutes after arrival and at specified times until discharge or admission. Urine samples for measurement of LTE4 levels were obtained either on arrival at the study site and/or before discharge. Patients were seen 2 weeks later for follow up, at which time repeat FEV1 measurements and urine samples for LTE4 were obtained. RESULTS One hundred and eighty four patients were evaluated; LTE4 results from both the acute and follow up periods were available for analysis in 146. Urinary LTE4 levels were increased during asthma exacerbations compared with levels obtained 2 weeks later (geometric means 111.7 and 75.6 pg/mg creatinine, respectively, mean percentage change -32.3; 95% confidence interval (CI) for the mean percentage change -39.6 to -24.3, p<0.001). The correlation between improvement in FEV1 and decline in LTE4 over the 2 week interval was significant (p<0.001, r=0.43). CONCLUSIONS Activation of leukotriene pathways in acute asthma is correlated with the degree of airflow obstruction, and resolution of the asthma exacerbation is associated with a reduction in leukotriene levels.
Collapse
Affiliation(s)
- S A Green
- Merck Research Laboratories, Rahway, NJ, USA.
| | | | | | | | | |
Collapse
|
18
|
Yoshikawa K, Matsui E, Inoue R, Kaneko H, Teramoto T, Aoki M, Kasahara K, Shinoda S, Fukutomi O, Kondo N. Urinary leukotriene E4 and 11-dehydro-thromboxane B2 excretion in children with bronchial asthma. Allergol Int 2004. [DOI: 10.1111/j.1440-1592.2004.00320.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
19
|
Higashi N, Taniguchi M, Mita H, Ishii T, Akiyama K. Nasal blockage and urinary leukotriene E4 concentration in patients with seasonal allergic rhinitis. Allergy 2003; 58:476-80. [PMID: 12757446 DOI: 10.1034/j.1398-9995.2003.00159.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Cysteinyl-leukotrienes have been reported to have a primary role in the induction of nasal blockage of allergic rhinitis. However, there has been little experimental evidence that substantiates the relationship between nasal blockage severity and urinary leukotriene E4 (U-LTE4) concentration in patients with seasonal allergic rhinitis (SAR). METHODS The concentrations of urinary mediators in 20 SAR patients were measured using an enzyme immunoassay to determine the relationship between nasal blockage severity and U-LTE4 concentration in patients with SAR. RESULTS The basal U-LTE4 concentration was significantly higher in SAR patients with severe nasal blockage than in those with mild nasal blockage and in healthy control subjects. Although U-LTE4 concentrationwas significantly higher in patients with both asthma and SAR than in SAR patients with mild nasal blockage, no significant difference in the U-LTE4 concentration between patients with both asthma and SAR and SAR patients with severe nasal blockage was found. There was a significant correlation between U-LTE4 and urinary 9alpha11beta-prostoglandin F2 (9alpha11betaPGF2) concentrations (rs = 0.51, P = 0.02) in SAR patients. CONCLUSIONS Although specific sites and cells of cysteinyl-leukotriene biosynthesis could not be determined in this study, severe nasal blockage is associated with the increased excretion level of U-LTE4.
Collapse
Affiliation(s)
- N Higashi
- Clinical Research Center, National Sagamihara Hospital, Kanagawa, Japan
| | | | | | | | | |
Collapse
|
20
|
Crimi N, Pagano C, Palermo F, Mastruzzo C, Prosperini G, Pistorio MP, Vancheri C. Inhibitory effect of a leukotriene receptor antagonist (montelukast) on neurokinin A-induced bronchoconstriction. J Allergy Clin Immunol 2003; 111:833-9. [PMID: 12704366 DOI: 10.1067/mai.2003.161] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Tachykinins are potent contractors of human airways producing a dose-related bronchoconstriction when administered by means of inhalation to asthmatic subjects. OBJECTIVE The aim of this study was to examine the effective role played by leukotrienes (LTs) in neurokinin A (NKA)-induced bronchoconstriction in asthmatic patients. METHODS To address this question, we investigated the protective effect of a selective cysteinyl LT receptor antagonist, montelukast, against inhaled NKA and determined LTE(4) excretion in the urine. RESULTS Inhaled NKA in the absence of any drug treatment produced a concentration-related bronchospasm with a geometric mean provocative concentration required to produce a 15% decrease in FEV(1) from the postsaline baseline value (PC(15)) value of 290.9 microg/mL (+SE, 407.1 microg/mL; -SE, 207.84 microg/mL). Montelukast pretreatment significantly increased (P <.01) the PC(15) NKA value (708.8 microg/mL; +SE, 890.47 microg/mL; -SE, 564.15 microg/mL) in comparison with placebo (394.4 microg/mL; +SE, 491.88 microg/mL; -SE, 248.16 microg/mL) and produced a shift of the NKA concentration-response curve to the right in all the subjects studied. When compared with placebo, montelukast did not have a significant protective effect against methacholine challenge; the geometric mean PC(15) values obtained were 0.87 and 0.96 mg/mL with placebo and montelukast, respectively. Although we have not observed any increase in urinary LTE(4) excretion after NKA inhalation, we have shown that pretreatment of asthmatic subjects with montelukast elicits a significant protection against NKA-induced bronchoconstriction. CONCLUSION In asthmatic subjects NKA-induced bronchoconstriction is indirectly caused by the release of LTs, and this mechanism could explain some of the antiasthmatic and anti-inflammatory effects of LT antagonists.
Collapse
Affiliation(s)
- Nunzio Crimi
- Department of Internal and Specialistic Medicine, Section of Respiratory Diseases and Infectious Diseases, University of Catania, Catania
| | | | | | | | | | | | | |
Collapse
|
21
|
Affiliation(s)
- William M Abraham
- Division of Pulmonary and Critical Care Medicine, University of Miami School of Medicine at Mount Sinai Medical Center, Miami Beach, Florida 33140, USA.
| |
Collapse
|
22
|
Di Lorenzo G, Pacor ML, Vignola AM, Profita M, Esposito-Pellitteri M, Biasi D, Corrocher R, Caruso C. Urinary metabolites of histamine and leukotrienes before and after placebo-controlled challenge with ASA and food additives in chronic urticaria patients. Allergy 2002; 57:1180-6. [PMID: 12464047 DOI: 10.1034/j.1398-9995.2002.23767.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND The recovery of mediator metabolites from urine has the potential to provide a rapid, safe, and easily available index of release of mediators. We aimed to determine urinary metabolites of both histamine and leukotrienes (LTs) in patients affected by chronic urticaria (CU). METHODS Twenty patients with CU were studied. They were selected on the basis of double-blind placebo-controlled challenge (DBPC) with acetyl salicylic acid (ASA) and food additives. Ten patients (group B) were negative to both challenges. Ten patients (group C) presented urticaria and/or the appearance of angioedema during or 24 h after challenge, with reactions to ASA (five patients) or food additives (five patients). We recruited 15 healthy volunteers as controls (group A). During a second challenge, groups B and C were challenged double-blind with a single dose of ASA, or a specific food additive, or placebo. The healthy group was challenged only with a placebo (talc capsule). Patients in groups B and C were challenged twice: with placebo (as groups B1 and C1) and with ASA (groups B2 and C2) or food additives (C2). Four samples of urine were collected; one during the night before the specific or sham challenge (baseline), and three at 2, 6 and 24 h after the challenge. Urinary methylhistamine (N-MH) and LTE4 were analyzed and normalized for urinary creatinine. RESULTS For urinary N-MH at baseline, there was a significant difference only between group A and groups B1, B2, C1 and C2 (A vs. B1, P < 0.0001; A vs. B2, P < 0.0001; A vs. C1, P < 0.0001; A vs. C2, P < 0.0001). We detected a significant variation in urinary methylhistamine excretion only in group C2 after 2 h, 6 h and 24 h (P < 0.0001). However, no variations were observed in N-MH excretion rate in the other groups (A, B1, C1) after challenge with placebo, and in B2 after challenge with ASA 20 mg. For urinary LTE4 at baseline no differences were found between the mean values for the different groups. After specific challenge, only C2 patients showed significantly increased excretion rates of urinary LTE4 compared with the other groups challenged with placebo (A, B1, C1), or ASA (B2) (P < 0.0001). No significant correlation was seen between urinary LTE4 and methylhistamine excretion rate in any patients. CONCLUSION Our results show that urinary excretion of N-MH and LTE4 is different for CU patients without ASA or food hypersensitivity, compared to those with CU with ASA or food additive hypersensitivity after specific challenge.
Collapse
Affiliation(s)
- G Di Lorenzo
- Dipartimento di Medicina Clinica e delle Patologie Emergenti, Università degli Studi di Palermo, Italy
| | | | | | | | | | | | | | | |
Collapse
|
23
|
|
24
|
Higashi N, Taniguchi M, Mita H, Osame M, Akiyama K. A comparative study of eicosanoid concentrations in sputum and urine in patients with aspirin-intolerant asthma. Clin Exp Allergy 2002; 32:1484-90. [PMID: 12372129 DOI: 10.1046/j.1365-2745.2002.01507.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Although many studies have assumed that the overproduction of cysteinyl- leukotrienes (cys-LTs) and an imbalance of arachidonic acid metabolism may be plausible causes for the pathogenesis of aspirin-intolerant asthma (AIA), there has been little experimental evidence to substantiate this notion in lower airways of patients with AIA. OBJECTIVES The purpose of this study was to compare the eicosanoid concentrations in sputum and urine from patients with AIA. METHODS The concentrations of sputum cys-LTs, prostaglandin E2 (PGE2), PGF2alpha, PGD2 and thromboxane B2 were measured to assess local concentrations of eicosanoids in patients with AIA and in those with aspirin-tolerant asthma (ATA). The concentrations of two urinary metabolites, leukotriene E4 (LTE4) and 9alpha11betaPGF2, were also measured to corroborate the relationship between the eicosanoid biosynthesis in the whole body and that in lower airways. RESULTS The concentration of PGD2 in sputum was significantly higher in patients with AIA than in those with ATA (median, 5.3 pg/mL vs. 3.1 pg/mL, P < 0.05), but there was no significant difference in the concentration of the corresponding metabolite, 9alpha11betaPGF2, between the two groups. No differences were noted in the concentrations of other prostanoids in sputum between the two groups. The sputum cys-LT concentrations showed no differences between the two groups, in spite of the observation that the concentration of urinary LTE4 was significantly higher in patients with AIA than in those with ATA (median, 195.2 pg/mg-cre vs. 122.1 pg/mg-cre, P < 0.05). There was a significant correlation among the concentration of cys-LTs, the number of eosinophils and the concentration of eosinophil-derived neurotoxin (EDN) in sputum. CONCLUSION The urinary concentration of LTE4 does not necessary reflect cys-LT biosynthesis in lower airways. A significantly higher concentration of PGD2 in sputum from patients with AIA suggests the possible ongoing mast cell activation in lower airways.
Collapse
Affiliation(s)
- N Higashi
- Clinical Research Center for Allergy and Rheumatology, National Sagamihara Hospital, Sagamihara, Kanagwa, Japan.
| | | | | | | | | |
Collapse
|
25
|
Martin TJ, Broadley KJ. Mediators of adenosine- and ovalbumen-induced bronchoconstriction of sensitized guinea-pig isolated airways. Eur J Pharmacol 2002; 451:89-99. [PMID: 12223233 DOI: 10.1016/s0014-2999(02)02197-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The mediators of bronchoconstriction of isolated lungs and trachea from ovalbumen sensitized guinea-pigs to adenosine and ovalbumen were examined using relevant antagonists. Changes in perfusion pressure and tension of paired lung halves and tracheal spiral strips, respectively, were recorded in response to adenosine (1 mM lung, 300 microM trachea), histamine (10 microM), methacholine (10 microM) and ovalbumen (10 microg). One half was perfused with antagonist while the other received vehicle. Tracheal strips were superfused throughout with the P(1) receptor antagonist 8-phenyltheophylline, to examine 8-phenyltheophylline-resistant responses. The histamine H(1) receptor antagonist, mepyramine (1.5 mM), the cyclooxygenase inhibitors, indomethacin (5 mM) and diclofenac (5 mM), the leukotriene receptor antagonist, zafirlukast (1 mM), and the lipoxygenase inhibitor, zileuton (20 mM), alone failed to inhibit bronchoconstriction by adenosine and ovalbumen of the lung and trachea. When two antagonists were combined, only mepyramine and zafirlukast significantly reduced the lung responses to adenosine and ovalbumen. The tracheal adenosine response was substantially reduced, although not significantly, while ovalbumen was significantly reduced. When mepyramine, indomethacin and zafirlukast were combined, the lung constriction by adenosine and ovalbumen were virtually abolished. Similarly, the combination of mepyramine, diclofenac and zafirlukast significantly attenuated the lung responses to adenosine and ovalbumen. Thus, histamine, cyclooxygenase products and leukotrienes alone are not responsible for the bronchoconstriction of isolated sensitized lung tissues to adenosine or ovalbumen, which appears to be due to the release of all three mediators.
Collapse
Affiliation(s)
- Timothy J Martin
- Department of Pharmacology, Welsh School of Pharmacy, Cardiff University, Cathays Park, Cardiff, Wales CF10 3XF, UK
| | | |
Collapse
|
26
|
Ketchell RI, D'Amato M, Jensen MW, O'Connor BJ. Contrasting effects of allergen challenge on airway responsiveness to cysteinyl leukotriene D(4) and methacholine in mild asthma. Thorax 2002; 57:575-80. [PMID: 12096198 PMCID: PMC1746387 DOI: 10.1136/thorax.57.7.575] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BACKGROUND Cysteinyl leukotrienes (cysteinyl-LTs) have been implicated in the pathogenesis of allergen induced airway responses. Airway responsiveness (AR) to inhaled cysteinyl-LTs is dramatically increased following allergen challenge in animal studies. The effect in man has not been evaluated. METHODS Ten mild steroid-naïve asthmatic subjects with an isolated early asthmatic response (EAR) and 21 with an additional late asthmatic response (LAR) took part in a randomised controlled crossover study to assess AR to inhaled methacholine (MCh) and cysteinyl-LT D(4) (LTD(4)) 22 and 24 hours, respectively, after allergen challenge. Eight subjects had two further LTD(4) challenges separated by a 2 week washout period to assess the reproducibility of inhaled LTD(4) challenge. RESULTS In subjects with an isolated EAR, non-significant mean (SE) increases in AR of 0.4 (0.4) doubling doses (DD) for MCh and 0.4 (0.5) DD for LTD(4) followed allergen challenge compared with control. A significant correlation between AR to MCh and LTD(4) followed both control (r=0.91, 95% CI 0.67 to 0.98; p=0.0002) and allergen challenge (r=0.79, 95% CI 0.32 to 0.95; p=0.0063). In subjects with an additional LAR there was a significant increase in AR to MCh (1.2 (0.3) DD, p=0.0005) following allergen challenge but no overall effect on AR to LTD(4) (0.69 (0.4) DD, p=0.11). A significant correlation between AR to MCh and LTD(4) was again observed (r=0.70; 95% CI 0.38 to 0.87; p=0.0004) following control, although it was reduced following allergen challenge (r=0.48; 95% CI 0.063 to 0.76; p=0.027). LTD(4) challenge was highly reproducible with a mean difference of 0.2 (0.3) DD between challenges. CONCLUSIONS Allergen challenge significantly increases AR to inhaled MCh but not to LTD(4) in subjects with LAR. The lack of a comparable increase in AR to LTD(4) is surprising. Endogenous cysteinyl-LTs are produced in abundance following allergen challenge and may enhance AR to MCh or induce a degree of tachyphylaxis to LTD(4).
Collapse
Affiliation(s)
- R I Ketchell
- Department of Respiratory Medicine and Allergy, Guys, King's & St Thomas' School of Medicine, King's College, London SE5 9PJ, UK.
| | | | | | | |
Collapse
|
27
|
Xiang A, Uchida Y, Nomura A, Iijima H, Sakamoto T, Ishii Y, Morishima Y, Masuyama K, Zhang M, Hirano K, Sekizawa K. Involvement of thromboxane A(2) in airway mucous cells in asthma-related cough. J Appl Physiol (1985) 2002; 92:763-70. [PMID: 11796690 DOI: 10.1152/jappl.2002.92.2.763] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to elucidate the role of thromboxane A(2) (TxA(2)) on asthma-related cough in guinea pigs. Animals were immunosensitized and repeatedly challenged with ovalbumin as an antigen. Coughs were induced by the inhalation of 10(-5) M capsaicin solution for 10 min. Thromboxane synthetase (TxS) inhibitor OKY-046 and thromboxane-receptor antagonist AA-2414 significantly inhibited cough responses in repeatedly challenged animals. Inhalation of TxA(2) mimic STA-2- potentiated cough responses in normal and immunosensitized animals but not in repeatedly challenged ones. Moreover, STA-2-potentiated coughs were inhibited by administration of neurokinin-receptor antagonist FK-224. In repeatedly challenged animals, concentration of TxB(2) in airway lavage fluid, expression of TxS mRNA in tracheal epithelia, and the immunostaining intensity against TxS in mucous cells of the epithelium significantly increased compared with normal and sensitized animals. These results suggest that TxA(2) derived from mucous cells potentiated cough responses to capsaicin in allergic airway inflammation.
Collapse
Affiliation(s)
- Anbo Xiang
- Department of Pulmonary Medicine, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Kurokawa K, Tanaka H, Tanaka S, Abe S. Circadian characteristics of urinary leukotriene E(4) in healthy subjects and nocturnal asthmatic patients. Chest 2001; 120:1822-8. [PMID: 11742908 DOI: 10.1378/chest.120.6.1822] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
STUDY OBJECTIVES Circadian rhythmicity of cysteinyl leukotrienes (LTs) and thromboxane (TX)-A(2) in healthy subjects and nocturnal asthmatic patients remains a subject of controversy. The aim of this study was to investigate the contribution of these mediators to the pathogenesis of nocturnal asthma. METHODS We measured peak expiratory flow rate, urinary concentration of LTE(4), 11-dehydro-TXB(2), and creatinine eight times every 3 h in three groups: healthy control subjects (n = 5, group A), nocturnal asthmatic patients (n = 9, group B), and nonnocturnal asthmatic subjects (n = 9, group C). To evaluate the reproducibility of the measurement of urinary LTE(4), we measured urinary LTE(4) in group A for 3 separate days. RESULTS The urinary LTE(4) concentrations from 3 to 6 AM were significantly (p < 0.05) higher than from 3 to 6 PM in both group A and group B, but not in group C. The mean levels of LTE(4) in group B and group C were significantly higher (p < 0.05) than those in group A. In group B, another small peak was observed from 6 to 9 PM. No significant day-to-day variation was observed in group A. Urinary 11-dehydro-TXB(2) values from 3 to 6 AM were significantly (p < 0.001) higher than those levels from 3 to 6 PM in all groups, and the mean levels in group B and group C were significantly higher than those in group A (p < 0.05). CONCLUSIONS Circadian rhythmicity of urinary LTE(4) with a morning peak was found in healthy control subjects and nocturnal asthmatic subjects, but not in nonnocturnal asthmatic patients. It was suggested that cysteinyl LTs rather than TXA(2) might contribute to the nocturnal worsening of asthma.
Collapse
Affiliation(s)
- K Kurokawa
- Third Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | | | | | | |
Collapse
|
29
|
Nakamura H, Hishinuma T, Suzuki N, Chiba S, Tsukamoto H, Takabatake M, Sawai T, Mitomo T, Inoue H, Matsumoto F, Mizugaki M. Difference in urinary 11-dehydro TXB2 and LTE4 excretion in patients with rheumatoid arthritis. Prostaglandins Leukot Essent Fatty Acids 2001; 65:301-6. [PMID: 11993724 DOI: 10.1054/plef.2001.0329] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Thromboxane and leukotrienes have been implicated in inflammation. However, the production level of these eicosanoids in patients with rheumatoid arthritis is still unclarified. In the present study, endogenous synthesis of thromboxane and cysteinyl leukotrienes in patients was investigated. The production of eicosanoids in patients is assessed by measuring stable urinary metabolites,11-dehydro thromboxane B2 and leukotriene E4, using gas chromatography/selected ion monitoring and liquid chromatography/tandem mass spectrometry. The level of urinary thromboxane in patients was significantly higher than that in healthy volunteers (P < 0.05). Furthermore, we investigated the effects of administered drugs on the production of these eicosanoids. The urinary thromboxane level of the untreated group (1630 +/- 613 pg/mg creatinine) was much higher than that of healthy volunteers (342 +/- 263 pg/mg creatinine). The level in the group receiving NSAID alone was similar to that in healthy volunteers, and the group receiving steroid alone showed slightly lower thromboxane levels than the untreated group. On the other hand, the leukotriene E4 level in patients (280 +/- 360 pg/mg creatinine) was also significantly higher than that in healthy volunteers (59 +/- 54 pg/mg creatinine, P < 0.05). In particular, the group receiving methotrexate (904 +/- 685 pg/mg creatinine) had higher leukotriene levels than not only healthy volunteers but also other medicated groups. These findings demonstrated that endogenous thromboxane and leukotriene production in patients with rheumatoid arthritis are enhanced, and the effects of medication on the production of these eicosanoids differed in thromboxane and leukotriene E4.
Collapse
Affiliation(s)
- H Nakamura
- Department of Pharmaceutical Sciences, Tohoku University Hospital, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Rolin S, Dogné JM, Michaux C, Delarge J, Masereel B. Activity of a novel dual thromboxane A(2)receptor antagonist and thromboxane synthase inhibitor (BM-573) on platelet function and isolated smooth muscles. Prostaglandins Leukot Essent Fatty Acids 2001; 65:67-72. [PMID: 11545621 DOI: 10.1054/plef.2001.0290] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The pharmacomodulation of sulfonylureas structurally related to torasemide and characterized by a TXA(2)antagonism led to the synthesis of BM-573. This original molecule showed a high affinity (IC(50)1.3 nM) for the TXA(2)receptor of human platelets in comparison with both reference compounds, SQ-29548 (IC(50)21 nM) and sulotroban (IC(50)930 nM). Moreover, this torasemide derivative was found to be a potent inhibitor of human platelet aggregation induced by arachidonic acid (ED(100)=0.13 microM) or by U-46619 (ED(50)=0.24 microM), a TXA(2)agonist. BM-573 relaxed the isolated rat thoracic aorta (ED(50)=28.4 nM) and guinea-pig trachea (ED(50)=17.7 nM) contracted by U-46619. BM-573 (1 microM) completely reduced the platelet production of TXB(2)induced by arachidonic acid. Finally, BM-573 (30 mg/kg, per os) lost the diuretic properties of torasemide in rats.
Collapse
MESH Headings
- 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid/pharmacology
- Animals
- Antihypertensive Agents/pharmacology
- Aorta/drug effects
- Aorta/enzymology
- Aorta/metabolism
- Arachidonic Acid/antagonists & inhibitors
- Blood Platelets/drug effects
- Blood Platelets/enzymology
- Blood Platelets/metabolism
- Bridged Bicyclo Compounds, Heterocyclic
- Dose-Response Relationship, Drug
- Fatty Acids, Unsaturated
- Guinea Pigs
- Humans
- Hydrazines/pharmacology
- Inhibitory Concentration 50
- Models, Chemical
- Muscle, Smooth/drug effects
- Muscle, Smooth/enzymology
- Muscle, Smooth/metabolism
- Platelet Aggregation/drug effects
- Platelet Aggregation Inhibitors/pharmacology
- Rats
- Rats, Wistar
- Receptors, Thromboxane/antagonists & inhibitors
- Sulfonamides/pharmacology
- Thromboxane-A Synthase/antagonists & inhibitors
- Torsemide
- Trachea/drug effects
- Trachea/enzymology
- Trachea/metabolism
- Vasoconstrictor Agents/pharmacology
Collapse
Affiliation(s)
- S Rolin
- Department of Pharmacy, University of Namur, FUNDP, 61 rue de Bruxelles, B-5000 Namur, Belgium
| | | | | | | | | |
Collapse
|
31
|
Abstract
This review describes the aspects of leukotriene (LT) pharmacology and biology that are relevant to their important role in asthma. The biosynthesis and metabolism, including transcellular metabolism, of LTB4 and the cysteinyl-LTs (i.e. LTC4, LTD4 and LTE4) are described, and their transport is briefly outlined. The existence, distribution and pharmacological characterization of the receptors (BLT, CysLT1, CysLT2), as well as the transduction mechanisms triggered, are discussed in detail. We also describe their effects on airway smooth muscle tone, hyperresponsiveness and proliferation, on vascular tone and permeability, on mucus secretion, on neural fibers and inflammatory cell functions. Finally, the evidence supporting their role as asthma mediators is reviewed, including the effects of anti LT drugs (both biosynthesis inhibitors and receptor antagonists) in experimental and clinical asthma.
Collapse
Affiliation(s)
- S Nicosia
- Laboratory of Molecular Pharmacology, Institute of Pharmacological Sciences, University of Milan, via Balzaretti, Milan, 9-20133, Italy.
| | | | | |
Collapse
|
32
|
Abeywardena MY, Jablonskis LT, Head RJ. Dietary n-3 and n-6 polyunsaturated oils and airway contractility. Prostaglandins Leukot Essent Fatty Acids 2001; 64:281-7. [PMID: 11418024 DOI: 10.1054/plef.2001.0272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Recent reports suggest modulation of chronic obstructive pulmonary disease by dietary polyunsaturated fatty acids. In the present study, we re-examined this possibility by using an established animal model of pulmonary sensitisation. Adult guinea pigs were fed diets supplemented (10% w/w) with either olive, canola or safflower oil for 4 weeks before sensitising with ovalbumin and continuing on various diets for a further 6 week period. Neither the contraction following ovalbumin challenge, nor the responses to histamine, carbachol and various eicosanoid mediators - prostaglandin F(2 alpha), leukotriene C(4), thromboxane mimetic U44619 - of isolated segments of airway tissue were altered (P>0.05, ANOVA) by the dietary lipid treatment. Lipid analysis showed changes in membrane linoleic acid (18:2n-6) and alpha -linolenic acids (alpha 18:3n-3) in lung phospholipids consistent with dietary intakes. However, no significant further desaturation/elongation of these dietary precursors was evident. Ovalbumin induced contraction was fully reversed by the lipoxygenase inhibitor esculetin whilst indomethacin resulted in a slight increase possibly due to the inhibition of bronchodilator prostanoids. Results confirm that under the conditions employed airway function was not influenced by the variable dietary intakes of n-3 and n-6 PUFA.
Collapse
Affiliation(s)
- M Y Abeywardena
- Health Sciences and Nutrition, CSIRO, Kintore Avenue, Adelaide, SA, 5000, Australia.
| | | | | |
Collapse
|
33
|
Dworski R, Roberts LJ, Murray JJ, Morrow JD, Hartert TV, Sheller JR. Assessment of oxidant stress in allergic asthma by measurement of the major urinary metabolite of F2-isoprostane, 15-F2t-IsoP (8-iso-PGF2alpha). Clin Exp Allergy 2001; 31:387-90. [PMID: 11260149 DOI: 10.1046/j.1365-2222.2001.01055.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Asthma is a chronic inflammatory disease of the airways which may involve an oxidant injury to the lung. Assessment of oxidant stress is difficult in vivo, but measurement of F2-isoprostanes (F2-IsoPs), free radical-catalysed products of arachidonic acid, appears to offer a reliable approach for quantitative measurement of oxidative stress status in vivo. We have recently developed a mass spectrometric assay for 2,3-dinor-5,6-dihydro-15-F2t-IsoP (15-F2t-IsoP-M), the major urinary metabolite of the F2-IsoP, 15-F2t-IsoP (8-iso-PGF2a). Measurement of the urinary excretion of this metabolite offers a reliable index of oxidative stress status in vivo that has advantages over measuring unmetabolized F2-IsoPs in urine and plasma. To assess the occurrence of oxidative stress in patients with atopic asthma following allergen exposure in vivo by measuring the urinary excretion of 15-F2t-IsoP-M. Analysis of 15-F2t-IsoP-M by GC-NICI-MS in nine mild atopic asthmatics following inhaled allergen provocation and four asthmatic subjects after inhaled challenge with methacholine. Urinary excretion of 15-F2t-IsoP-M increased at 2 h after allergen challenge and remained significantly elevated in all urine collections during the subsequent 8-h period of the study compared to the baseline value (ANOVA, and Student-Newman-Keuls multiple comparisons test). No increase in the urinary excretion of 15-F2t-IsoP-M occurred after inhalation of methacholine. Allergen challenge causes an oxidant injury in human atopic asthmatics. 15-F2t-IsoP-M is a valuable marker of oxidant stress in vivo.
Collapse
Affiliation(s)
- R Dworski
- Department of Critical Care Medicine, Vanderbilt University School of Medicine, T-1217 MCN, Nashville, TN 37232-2650, USA.
| | | | | | | | | | | |
Collapse
|
34
|
Saegusa S, Tsubone H, Kuwahara M. Leukotriene D(4)-induced Rho-mediated actin reorganization in human bronchial smooth muscle cells. Eur J Pharmacol 2001; 413:163-71. [PMID: 11226389 DOI: 10.1016/s0014-2999(01)00773-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigated the role of cysteinyl leukotriene (CysLT) receptors on leukotriene D(4)-induced actin reorganization and the signaling pathways of the response in human bronchial smooth muscle cells. The effects of leukotriene D(4) on actin reorganization in human bronchial smooth muscle cells were evaluated by dual-fluorescence labeling of filamentous (F) and monomeric (G) actin with fluorescein isothiocyanate (FITC)-labeled phalloidin and Texas Red-labeled DNase I, respectively. Leukotriene D(4) (100 nM) induced actin reorganization in the presence and absence of extracellular Ca(2+). The CysLT type 1 (CysLT(1)) receptor antagonist ONO 1078 (4-oxo-8(-)[p-(4-phenylbutyloxy) benzoylamino]-2-(tetrazol-5-yl)-4H-1-benzopyran hemihydrate) inhibited leukotriene D(4)-induced actin reorganization. Pretreatment with pertussis toxin, C3 exoenzyme, or tyrosine kinase inhibitors significantly reduced leukotriene D(4)-induced actin reorganization. However, phosphatidylinositol-3-kinase and protein kinase C inhibitors had little effect on these responses. These results suggest that leukotriene D(4)-induced actin reorganization in human bronchial smooth muscle cells is extremely dependent on the CysLT(1) receptor coupled with pertussis toxin-sensitive G protein, Rho GTPases and tyrosine phosphorylation pathways.
Collapse
Affiliation(s)
- S Saegusa
- Department of Comparative Pathophysiology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
| | | | | |
Collapse
|
35
|
Suzuki N, Hishinuma T, Abe F, Omata K, Ito S, Sugiyama M, Mizugaki M. Difference in urinary LTE4 and 11-dehydro-TXB2 excretion in asthmatic patients. Prostaglandins Other Lipid Mediat 2000; 62:395-403. [PMID: 11060902 DOI: 10.1016/s0090-6980(00)00091-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Bronchoconstrictor cysteinyl leukotrienes (LT) and thromboxane (TX) A2 have been implicated in the pathogenesis of asthma. Determination of urinary leukotriene E4 (LTE4) and 11-dehydro-TXB2 levels are often used to assess cysteinyl LT and TXA2 production in humans. To define the potential role in the pathogenesis of asthma, we investigated the urinary LTE4 and 11-dehydro-TXB2 levels. LTE4 and 11-dehydro-TXB2 levels were determined using liquid chromatography/tandem mass spectrometry (LC/MS) and gas chromatography/mass spectrometry (GC/MS), respectively. Urinary LTE4 levels in asthmatic patients (192 +/- 122 pg/mg creatinine, n = 14) were significantly higher (P < 0.005) than those in healthy volunteers (55 +/- 16 pg/mg creatinine, n = 13), but no significant difference in 11-dehydro-TXB2 levels was observed. A significant inverse correlation (r = -0.821, P < 0.005) was found between urinary LTE4 levels and the forced expiratory volume in 1 s (FEV1) but no significant correlation was observed between urinary 11-dehydro-TXB2 levels and FEV1. The present findings suggest that cysteinyl LTs play a more important role in the pathogenesis of asthma than TXA2.
Collapse
Affiliation(s)
- N Suzuki
- Department of Pharmaceutical Sciences, Tohoku University Hospital, Sendai, Japan
| | | | | | | | | | | | | |
Collapse
|
36
|
Hartert TV, Dworski RT, Mellen BG, Oates JA, Murray JJ, Sheller JR. Prostaglandin E(2) decreases allergen-stimulated release of prostaglandin D(2) in airways of subjects with asthma. Am J Respir Crit Care Med 2000; 162:637-40. [PMID: 10934099 DOI: 10.1164/ajrccm.162.2.9904038] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Prostaglandin E(2) (PGE(2)) inhibits the early and late bronchoconstrictor response to inhaled allergen. The mechanisms of action, however, are not understood. We investigated the effect of inhaled PGE(2) on the release of prostaglandin D(2) (PGD(2)), preformed mast cell mediators, and other products of arachidonic acid metabolism. We compared inhaled PGE(2) (100 microgram) to placebo in a randomized double-blind crossover study. Ten atopic asthmatics underwent bronchoscopy immediately after inhalation of PGE(2) or placebo. Bronchoalveolar lavage (BAL) was performed at baseline, and in a separate segment 4 min after allergen instillation. Nebulized PGE(2) was well tolerated. PGE(2) concentrations in baseline lavage fluid were significantly greater after PGE(2) inhalation than after placebo. PGD(2) concentrations after allergen challenge were significantly reduced in those subjects receiving nebulized PGE(2) compared with control subjects. We conclude that PGE(2) can be safely delivered by inhalation. Nebulized PGE(2) administered before to segmental allergen challenge reduced PGD(2) in BAL fluid (BALF). PGE(2) also decreased the production of other mediators of the arachidonic acid pathway, although not significantly. The reduction of PGD(2) may be part of the mechanism by which PGE(2) blocks the early asthmatic response.
Collapse
Affiliation(s)
- T V Hartert
- Department of Medicine, Division of Allergy, Pulmonary and Critical Care Medicine, and Division of Clinical Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | | | | | | | | | | |
Collapse
|
37
|
Abstract
Since their identification in 1979, the cysteinyl leukotrienes (cysLTs) have been shown to be prominent in many inflammatory conditions, including asthma, allergic rhinitis, rheumatoid arthritis, psoriasis, cystic fibrosis and inflammatory bowel disease. They are potent pro-inflammatory agents, as well as causing bronchoconstriction, and undoubtedly have a role in asthma. The cysLTs are products of arachidonic acid metabolism and have been shown to have effects via a cysteinyl leukotriene receptor (CysLTR1) on vascular permeability, mucus production, chemotaxis and bronchial smooth muscle. Their detection in certain body fluids in allergic, aspirin-sensitive and exercise-induced asthma is well documented and potential roles in pathogenesis, proposed. The development of agents affecting production or action offers an exciting new approach to the treatment of asthma. Two approaches to antileukotriene therapy have been developed: blocking their production by inhibiting the action of 5-lipoxygenase enzyme or blocking the CysLTR1. Both approaches have been tried in studies in asthma and overall the results are encouraging, with a decrease in both daytime and nocturnal symptoms, a decrease in additional beta 2 agonist usage and improvement in lung function. The changes, however, are small in some studies. This may be a reflection of disease severity in the study subjects, but of note is a heterogeneity of response to these treatments that may be genetically determined. Antileukotriene therapy has been shown to have an effect in specific types of asthma where the role of cysLTs seems well established--aspirin-sensitive/intolerant asthma and exercise-induced asthma. Longer term studies are needed in other areas such as severe asthma and chronic persistent asthma in both children and adults to provide evidence for the appropriate placement of antileukotriene treatment in current asthma guidelines, in comparison with other established treatments.
Collapse
Affiliation(s)
- S D Crowther
- Department of Respiratory Medicine, 2nd Floor, Thomas Guy House, Guy's Hospital, St Thomas Street, London SE1 9RT, UK
| | | |
Collapse
|
38
|
Horiuchi T, Castro M. The pathobiologic implications for treatment. Old and new strategies in the treatment of chronic asthma. Clin Chest Med 2000; 21:381-95, x. [PMID: 10907595 DOI: 10.1016/s0272-5231(05)70273-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An increased understanding of the pathobiology of asthma has led to improved treatment for chronic asthma. This article discusses the old and new strategies of asthma therapy based on a pathobiologic approach. Therapeutic agents discussed include beta-adrenergic agonists, methylxanthines, corticosteroids, cromolyn, nedocromil, leukotriene modifiers, and new investigational agents.
Collapse
Affiliation(s)
- T Horiuchi
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | | |
Collapse
|
39
|
Arakida Y, Ohga K, Suwa K, Okada Y, Morio H, Yokota M, Miyata K, Yamada T, Honda K. In vivo pharmacologic profile of YM158, a new dual antagonist for leukotriene D4 and thromboxane A2 receptors. JAPANESE JOURNAL OF PHARMACOLOGY 2000; 83:63-72. [PMID: 10887942 DOI: 10.1254/jjp.83.63] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The antagonistic activity of oral YM158 (3-[(4-tert-butylthiazol-2-yl)methoxy]-5'-[3-(4-chlorobenzenesu lfonyl)propyl]-2'-(1H-tetrazol-5-ylmethoxy)benzanilide monosodium salt monohydrate), a new dual antagonist for leukotriene (LT) D4 and thromboxane (TX) A2 receptors, was investigated. Oral YM158 caused dose-dependent inhibition of LTD4-induced increases in plasma leakage and LTD4- or U46619-induced increases in airway resistance, with ED50 values of 6.6, 8.6 and 14 mg/kg, respectively. The dose-range of YM158's inhibitions was almost the same for both LTD4 and TXA2 receptors, and repeated oral doses did not affect its efficacy. Furthermore, oral YM158 inhibited antigen-induced bronchoconstriction. Although the potency of pranlukast for LTD4 receptor antagonism (ED50 = 0.34 mg/kg) is greater than that of YM158 (ED50 = 8.6 mg/kg), the doses of both pranlukast and YM158 for significant inhibition of the antigen-evoked airway response were the same, indicating that the TXA2 receptor antagonism of YM158 plays an important role in its anti-asthmatic effects. In conclusion, YM158 promises to be a novel agent for treating bronchial asthma.
Collapse
Affiliation(s)
- Y Arakida
- Inflammation Research Pharmacology Laboratories, Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co., Ltd., Ibaraki, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Macfarlane AJ, Dworski R, Sheller JR, Pavord ID, Kay AB, Barnes NC. Sputum cysteinyl leukotrienes increase 24 hours after allergen inhalation in atopic asthmatics. Am J Respir Crit Care Med 2000; 161:1553-8. [PMID: 10806153 DOI: 10.1164/ajrccm.161.5.9906068] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We have used the relatively noninvasive technique of induced sputum to measure allergen-induced changes in the concentration of eicosanoid mediators in bronchial secretions from atopic asthmatics. Sputum induction was performed before and 24 h after inhalational allergen challenge in 14 atopic asthmatics who developed a late asthmatic reaction (LAR). Differential cell counts were made on sputum cytospins and eicosanoid (cysteinyl leukotrienes [cys LTs], prostaglandin D(2) [PGD(2)], and PGE(2)) concentrations were measured in the sputum supernatants. The percentage of eosinophils at baseline correlated with the concentration of cys LTs (r = 0.84, p < 0.001) but not prostanoid mediators. Allergen challenge produced a significant increase in the concentration of sputum cys LTs from 3. 45 ng/ml sputum to 11.95 ng/ml (p = 0.002), which correlated with the increase in sputum eosinophils (r = 0.55, p < 0.05). There were no significant changes in PGD(2) or PGE(2) concentrations in sputum supernatants in response to challenge. Thus, the noninvasive technique of induced sputum has been used to demonstrate increased cys LTs, but not prostanoids associated with LAR after allergen challenge. The correlation between eosinophil numbers and cys LT concentrations at baseline values and 24 h after allergen challenge is consistent with these cells being a principal source of cys LTs within the airways at these time points.
Collapse
|
41
|
Kumlin M, Dahlén B. The challenge procedure influences the extent of allergen-induced urinary excretion of leukotriene E4. Clin Exp Allergy 2000; 30:585-9. [PMID: 10718858 DOI: 10.1046/j.1365-2222.2000.00738.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Cysteinyl-leukotrienes are central mediators in asthma and urinary leukotriene E4 (LTE4) is a reliable marker of their endogenous formation. OBJECTIVE This study tested the hypothesis that the procedure used for allergen bronchoprovocation influences the bronchoconstrictor response and the amount of LTE4 excreted following allergen challenge. METHODS Seven atopic asthmatic men underwent two allergen bronchoprovocations 4 weeks apart. The same total dose of allergen was given at both sessions, cumulatively on one occasion and as a single dose at the other session. Urine was collected in hourly samples before and after challenge and LTE4 was measured with previously validated methodology. RESULTS The mean (+/- SE) drop in FEV1 was not significantly different between the cumulative (29 +/- 2.4%) and the single dose challenge (25 +/- 2.8%). There was a significant increase in post-challenge levels of urinary LTE4 after both sessions. The peak excretion of LTE4 occurred 1 h following the maximal drop in FEV1 for both challenges. However, the post-challenge increase in urinary LTE4 was significantly larger at the cumulative session. In fact, the net increase (post-challenge minus prechallenge) of urinary LTE4 was more than twofold higher after the cumulative session (AUC 0-3 h post-challenge: 46.7 +/- 8.2 vs 22.1 +/- 9.8, P < 0.05). CONCLUSION The peak excretion of urinary LTE4 occurred within 2 h after the termination of either challenge but the magnitude of urinary excretion of LTE4 was larger when cumulative challenge was performed. The findings are important to consider when designing studies where allergen-induced urinary excretion of LTE4 is an outcome variable.
Collapse
Affiliation(s)
- M Kumlin
- Experimental Asthma and Allergy Research, The National Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
| | | |
Collapse
|
42
|
Affiliation(s)
- M Kumlin
- Experimental Asthma and Allergy Research, The National Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
| |
Collapse
|
43
|
Parnes SM, Chuma AV. Acute Effects of Antileukotrienes on Sinonasal Polyposis and Sinusitis. EAR, NOSE & THROAT JOURNAL 2000. [DOI: 10.1177/014556130007900107] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Recently, leukotrienes have been implicated in the mediation of bronchoconstriction and inflammatory changes in asthma. Leukotriene levels have also been shown to be elevated in patients with asthma as well as in those with sinonasal polyposis and sinusitis. The leukotriene synthesis inhibitor zileuton and the leukotriene receptor antagonist zafirlukast have been shown to produce subjective and objective improvements in patients with mild to moderate asthma. Given these findings, we evaluated the efficacy of these two medications in controlling sinonasal polyposis and their associated symptoms. We treated 40 patients diagnosed with sinonasal polyposis and sinusitis with either zileuton or zafirlukast. No other change was made in their standard therapy. Outcome measures included subjective interviews and questionnaire responses, as well as office endoscopic examinations and chart reviews. At study's end, 36 patients were available for evaluation. Twenty-six had taken zafirlukast, five had taken zileuton, and five others had switched from zafirlukast to zileuton. Overall, 26 patients (72%) experienced subjective improvement in their symptomatology after starting their medication. Statistically significant improvement was noted with respect to headache, facial pain and pressure, ear discomfort, dentalgia, purulent nasal discharge, postnasal drip, nasal congestion and obstruction, olfaction, and fever. An objective alleviation, or at least stabilization, of sinonasal polyposis was seen in 50% of the patients. Four patients (11%) discontinued their medication because of side effects. We conclude that antileukotrienes might play a significant role in controlling polyposis and symptoms secondary to sinonasal disease, and they might be a viable alternative to long-term oral steroid therapy and repeated surgical debridement.
Collapse
|
44
|
Tanaka H, Igarashi T, Saitoh T, Teramoto S, Miyazaki N, Kaneko S, Ohmichi M, Abe S. Can urinary eicosanoids be a potential predictive marker of clinical response to thromboxane A2 receptor antagonist in asthmatic patients? Respir Med 1999; 93:891-7. [PMID: 10653051 DOI: 10.1016/s0954-6111(99)90055-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Thromboxane (TX) A2 is an important bronchoconstrictor in the pathogenesis of asthma. Seratrodast, known as AA-2414, is a new oral TXA2 receptor antagonist which is currently prescribed in asthma therapy in Japan. However its clinical effects have been very different in individual subjects. To assess whether the clinical efficacy of TXA2 antagonist is predictable on the basis of urinary arachidonic acid metabolites in urine of patients with asthma, an open and multicentre trial was conducted. Fifty adult asthmatic subjects (women/men = 28/22) were enrolled [resting mean forced expiratory volume in 1 sec (FEV1)% was 82%; range, 50-96%]. Urinary levels of 11-dehydro-TXB2, leukotriene (LT) E4, 2,3-dinor-6-keto-prostaglandin F1alpha and creatinine in 3-h urine collected in the morning at the start of seratrodast (80 mg day(-1), once a day at evening for 4 weeks) were measured. Responders were defined by improvements of asthma symptoms score and peak expiratory flow rate (PEFR). Of the 50 subjects, 45 completed this study. Eighteen patients were responders and the other 27 were nonresponders. There were no significant differences between the two groups in patients' characteristics, baseline lung functions, treatments and baseline urinary eicosanoids. The 11-dehydro-TXB2/LTE4 ratio of responders was significantly higher (P = 0.0091) than that of non-responders (mean +/- SE, 7.49+/-0.71 vs. 5.09+/-0.67). Eleven patients out of 18 responders agreed to continue this drug for 6 months, the 11-dehydro-TXB2/LTE4 ratio decreased during this period, but not significantly. Our data demonstrated that responders and non-responders to TXA2 receptor antagonist existed in patients with asthma, and it suggests that the ratio of urinary eicosanoids might be a possible predictor of the effects of TXA2 receptor antagonist.
Collapse
Affiliation(s)
- H Tanaka
- Third Department of Internal Medicine, Sapporo Medical University School of Medicine, Japan
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Dworski R, Murray JJ, Roberts LJ, Oates JA, Morrow JD, Fisher L, Sheller JR. Allergen-induced synthesis of F(2)-isoprostanes in atopic asthmatics. Evidence for oxidant stress. Am J Respir Crit Care Med 1999; 160:1947-51. [PMID: 10588611 DOI: 10.1164/ajrccm.160.6.9903064] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
It is thought that reactive oxygen species (ROS) participate in the inflammation which characterizes asthma, but the evidence supporting this contention is incomplete. F(2)-isoprostanes (F(2)-IsoPs) are arachidonate products formed on membrane phospholipids by the action of ROS and thereby represent a quantitative measure of oxidant stress in vivo. Using a mass spectrometric assay we measured urinary release of F(2)-IsoPs in 11 patients with mild atopic asthma after inhaled allergen challenge. The excretion of F(2)-IsoPs increased at 2 h after allergen (1.5 +/- 0.2 versus 2.6 +/- 0.3 ng/mg creatinine) and remained significantly elevated in all urine collections for the 8-h period of the study (analysis of variance [ANOVA]). The measured compounds were of noncyclooxygenase origin because neither aspirin nor indomethacin given before challenge suppressed them. Urinary F(2)-IsoPs remained unchanged after inhaled methacholine challenge. In nine atopic asthmatics, F(2)-IsoPs were quantified in bronchoalveolar lavage fluid (BALF) at baseline values and in a separate segment 24 h after allergen instillation. F(2)-IsoPs were elevated late in the BALF (0.9 +/- 0.2 versus 11.4 +/- 3.0 pg /ml, baseline versus allergen, respectively, p = 0.007). The increase was inhibited by pretreatment of the subjects with inhaled corticosteroids. These findings provide a new evidence for a role for ROS and lipid peroxidation in allergen-induced airway inflammation.
Collapse
Affiliation(s)
- R Dworski
- Center for Lung Research and Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tenessee 37232-2650, USA.
| | | | | | | | | | | | | |
Collapse
|
46
|
Drazen JM. Asthma therapy with agents preventing leukotriene synthesis or action. PROCEEDINGS OF THE ASSOCIATION OF AMERICAN PHYSICIANS 1999; 111:547-59. [PMID: 10591083 DOI: 10.1046/j.1525-1381.1999.t01-1-99242.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Elucidation of the biochemistry of leukotriene production and the pharmacology of its actions has led to the development of a number of therapeutic agents shown to be of value in the treatment of asthma. These agents either prevent the synthesis of the leukotrienes, by preventing the action of the 5-lipoxygenase-activating protein or the catalytic action of the 5-lipoxygenase, or by inhibiting the action of leukotrienes at the CysLT1 receptor. Numerous clinical trials in exercise-induced asthma, allergen-induced asthma, aspirin-induced asthma, and spontaneously occurring asthmatic episodes have indicated that these agents are safe and effective asthma treatments.
Collapse
Affiliation(s)
- J M Drazen
- Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA
| |
Collapse
|
47
|
Neuparth N, Araújo Gonçalves P, Bugalho De Almeida A, Bensabat Rendas A. Asma e leucotrienos. REVISTA PORTUGUESA DE PNEUMOLOGIA 1999. [DOI: 10.1016/s0873-2159(15)31004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
48
|
Lazarus SC. Antileukotrienes and laboratory models of asthma. Clin Rev Allergy Immunol 1999; 17:223-33. [PMID: 10436868 DOI: 10.1007/bf02737606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- S C Lazarus
- Department of Medicine, University of California San Francisco, USA.
| |
Collapse
|
49
|
Affiliation(s)
- J Y Westcott
- National Jewish Medical and Research Center, Department of Medicine, Denver, CO 80206, USA.
| |
Collapse
|
50
|
Tanaka H, Saito T, Kurokawa K, Teramoto S, Miyazaki N, Kaneko S, Hashimoto M, Abe S. Leukotriene (LT)-receptor antagonist is more effective in asthmatic patients with a low baseline ratio of urinary LTE4 to 2,3-dinor-6-keto-prostaglandin (PG)F1alpha. Allergy 1999; 54:489-94. [PMID: 10380781 DOI: 10.1034/j.1398-9995.1999.00011.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND To test the hypothesis that urinary levels of arachidonic acid metabolites may be a predicting factor of the effects of pranlukast, a selective leukotriene (LT) antagonist, on chronic adult asthma, we investigated the relationship between its clinical efficacy and urinary eicosanoid levels. METHODS An open, multicenter trial was conducted involving 38 stable moderate and severe asthmatic patients (mean percent predicted FEV1 was 71%). All patients received pranlukast (225 mg twice daily) for 4 weeks after a 2-week run-in period. Urinary levels of LTE4, 11-dehydro-thromboxane (TX) B2, 2,3-dinor-6-keto-prostaglandin (PG) F1alpha, and creatinine were measured in 3-h urine collected on day 1 of the treatment. The responder was defined by an improvement of asthma symptom scores and peak expiratory flow rate (PEFR). RESULTS One patient was excluded because of an adverse effect, nausea. Thirteen out of 37 subjects were responders and 24 were nonresponders. There were no significant differences in patients' backgrounds and urinary arachidonate levels between the two groups. The urinary LTE4 to 2,3-dinor-6-keto-PGF1alpha ratio in the responder was significantly lower (P=0.01) than that in the nonresponder. In all patients, a significant inverse correlation was revealed between the baseline urinary LTE4/2,3-dinor-6-keto-PGF1alpha ratio and the improvement of PEFR in the morning (r=-0.43, P=0.007). CONCLUSIONS These data suggested that the urinary ratio of LTE4 to 2,3-dinor-6-keto-PGF1alpha might be one of the predictive markers of the clinical efficacy of this LT-receptor antagonist in asthmatic subjects.
Collapse
Affiliation(s)
- H Tanaka
- Third Department of Internal Medicine, Sapporo Medical University School of Medicine, Japan
| | | | | | | | | | | | | | | |
Collapse
|