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Nakamura M, Shimizu T. Therapeutic target of leukotriene B 4 receptors, BLT1 and BLT2: Insights from basic research. Biochimie 2023; 215:60-68. [PMID: 37423557 DOI: 10.1016/j.biochi.2023.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 06/28/2023] [Accepted: 06/30/2023] [Indexed: 07/11/2023]
Abstract
Leukotriene B4 (LTB4) is a lipid mediator rapidly generated from arachidonic acid in response to various stimuli. This lipid mediator exerts its biological activities by binding to cognate receptors. Two LTB4 receptors have been cloned; BLT1 and BLT2 as a high- and a low-affinity receptors, respectively. In numerous analyses, physiological and pathophysiological importance of LTB4 and cognate receptors in various diseases has been clarified. For example, disruption of the BLT1 gene or treatment with blockers for this receptor reduced various diseases such as rheumatoid arthritis and bronchial asthma in mice, in contrast BLT2 deficiency facilitated several diseases in the small intestine and the skin. These data support the idea that BLT1 blockers and BLT2 agonists could be useful for the cure of these diseases. Thus, various drugs targeting each receptor are being developed by many pharmaceutical companies. In this review, we focus on our current knowledge of the biosynthesis and physiological roles of LTB4 through cognate receptors. We further describe the effects of these receptor deficiencies on several pathophysiological conditions, including the potential of LTB4 receptors as therapeutic targets for the cure of the diseases. Moreover, current information on the structure and post-translational modification of BLT1 and BLT2 is discussed.
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Affiliation(s)
- Motonao Nakamura
- Department of Bioscience, Graduate School of Life Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005, Japan.
| | - Takao Shimizu
- Lipid Signaling, National Center for Global Health and Medicine, Tokyo, 162-8655, Japan; Institute of Microbial Chemistry, Tokyo, 141-0021, Japan
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2
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Yokomizo T, Shimizu T. The leukotriene B 4 receptors BLT1 and BLT2 as potential therapeutic targets. Immunol Rev 2023; 317:30-41. [PMID: 36908237 DOI: 10.1111/imr.13196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Abstract
Leukotriene B4 (LTB4 ) was recognized as an arachidonate-derived chemotactic factor for inflammatory cells and an important drug target even before the molecular identification of its receptors. We cloned the high- and low-affinity LTB4 receptors, BLT1 and BLT2, respectively, and examined their functions by generating and studying gene-targeted mice. BLT1 is involved in the pathogenesis of various inflammatory and immune diseases, including asthma, psoriasis, contact dermatitis, allergic conjunctivitis, age-related macular degeneration, and immune complex-mediated glomerulonephritis. Meanwhile, BLT2 is a high-affinity receptor for 12-hydroxyheptadecatrienoic acid, which is involved in the maintenance of dermal and intestinal barrier function, and the acceleration of skin and corneal wound healing. Thus, BLT1 antagonists and BLT2 agonists are promising candidates in the treatment of inflammatory diseases.
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Affiliation(s)
- Takehiko Yokomizo
- Department of Biochemistry, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Takao Shimizu
- Institute of Microbial Chemistry, Tokyo, Japan
- Department of Lipid Signaling, National Center for Global Health and Medicine, Tokyo, Japan
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Kato S, Onishi S, Sasai M, Yasuda H, Saeki K, Matsumoto K, Yokomizo T. Deficiency of leukotriene B4 receptor type 1 ameliorates ovalbumin-induced allergic enteritis in mice. Clin Exp Pharmacol Physiol 2023. [PMID: 37406678 DOI: 10.1111/1440-1681.13808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/30/2023] [Accepted: 06/24/2023] [Indexed: 07/07/2023]
Abstract
Leukotriene B4 receptor type 1 (BLT1), a high-affinity receptor for leukotriene B4 (LTB4), plays an important role in inflammatory responses, including allergic airway inflammation. In this study, we examined the effect of genetic BLT1 deletion (BLT1KO) on ovalbumin (OVA)-induced allergic enteritis in mice to determine the pathogenic role of LTB4/BLT1 in allergic enteritis, a gastrointestinal form of food allergy. Repeated oral OVA challenges after sensitization with OVA and aluminium potassium sulphate induced allergic enteritis, characterized by systemic allergic symptoms (scratching, immobility and swelling), diarrhoea, colonic oedema and colonic goblet cell hyperplasia, accompanied by increased colonic peroxidase activity, colonic inflammatory cytokine expression and increased serum OVA-specific IgE levels. The severity of enteritis was significantly attenuated in BLT1KO mice compared with wild-type (WT) mice, without an increase in serum OVA-specific IgE levels. The accumulation of neutrophils, eosinophils, M2-macrophages, dendritic cells, CD4+ T cells and mast cells was observed in the colonic mucosa of allergic enteritis, and such accumulation was significantly lower in BLT1KO mice than in WT mice. BLT1 expression was upregulated and colocalized mostly in neutrophils and partly in eosinophils and dendritic cells in the colonic mucosa of allergic enteritis. These findings indicate that BLT1 deficiency ameliorates OVA-induced allergic enteritis in mice and that LTB4/BLT1 contributes to neutrophil and eosinophil accumulation in the allergic colonic mucosa. Therefore, BLT1 is a promising drug target for treating food allergies.
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Affiliation(s)
- Shinichi Kato
- Division of Pathological Sciences, Laboratory of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Suzuka Onishi
- Division of Pathological Sciences, Laboratory of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Misaki Sasai
- Division of Pathological Sciences, Laboratory of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Hiroyuki Yasuda
- Division of Pathological Sciences, Laboratory of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Bunkyo, Japan
| | - Kenjiro Matsumoto
- Division of Pathological Sciences, Laboratory of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Bunkyo, Japan
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4
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Shioda R, Jo-Watanabe A, Okuno T, Saeki K, Nakayama M, Suzuki Y, Yokomizo T. The leukotriene B 4 /BLT1-dependent neutrophil accumulation exacerbates immune complex-mediated glomerulonephritis. FASEB J 2023; 37:e22789. [PMID: 36692419 DOI: 10.1096/fj.202201936r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/25/2022] [Accepted: 01/11/2023] [Indexed: 01/25/2023]
Abstract
Crescent formation is the most important pathological finding that defines the prognosis of nephritis. Although neutrophils are known to play an important role in the progression of crescentic glomerulonephritis, such as anti-neutrophil cytoplasmic antibody (ANCA)-associated glomerulonephritis, the key chemoattractant for neutrophils in ANCA-associated glomerulonephritis has not been identified. Here, we demonstrate that a lipid chemoattractant, leukotriene B4 (LTB4 ), and its receptor BLT1 are primarily involved in disease pathogenesis in a mouse model of immune complex-mediated crescentic glomerulonephritis. Circulating neutrophils accumulated into glomeruli within 1 h after disease onset, which was accompanied by LTB4 accumulation in the kidney cortex, leading to kidney injury. LTB4 was produced by cross-linking of Fc gamma receptors on neutrophils. Mice deficient in BLT1 or LTB4 biosynthesis exhibited suppressed initial neutrophil infiltration and subsequent thrombotic glomerulonephritis and renal fibrosis. Depletion of neutrophils before, but not after, disease onset prevented proteinuria and kidney injury, indicating the essential role of neutrophils in the early phase of glomerulonephritis. Administration of a BLT1 antagonist before and after disease onset almost completely suppressed induction of glomerulonephritis. Finally, we found that the glomeruli from patients with ANCA-associated glomerulonephritis contained more BLT1-positive cells than glomeruli from patients with other etiologies. Taken together, the LTB4 -BLT1 axis is the key driver of neutrophilic glomerular inflammation, and will be a novel therapeutic target for the crescentic glomerulonephritis.
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Affiliation(s)
- Ryotaro Shioda
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Airi Jo-Watanabe
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan.,AMED-PRIME, Japan Agency for Medical Research and Development, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Maiko Nakayama
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Yusuke Suzuki
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
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Asahara M, Ito N, Hoshino Y, Sasaki T, Yokomizo T, Nakamura M, Shimizu T, Yamada Y. Role of leukotriene B4 (LTB4)-LTB4 receptor 1 signaling in post-incisional nociceptive sensitization and local inflammation in mice. PLoS One 2022; 17:e0276135. [PMID: 36264904 PMCID: PMC9584502 DOI: 10.1371/journal.pone.0276135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 09/29/2022] [Indexed: 11/21/2022] Open
Abstract
Leukotriene B4 (LTB4) is a potent lipid mediator involved in the recruitment and activation of neutrophils, which is an important feature of tissue injury and inflammation. The biological effects of LTB4 are primarily mediated through the high-affinity LTB4 receptor, BLT1. Postoperative incisional pain is characterized by persistent acute pain at the site of tissue injury and is associated with local inflammation. Here, we compared the role of LTB4-BLT1 signaling in postoperative incisional pain between BLT1-knockout (BLT1KO) and wild-type (BLT1WT) mice. A planter incision model was developed, and mechanical pain hypersensitivity was determined using the von Frey test before and after incision. Local infiltration of neutrophils and inflammatory monocytes was quantified by flow cytometry. Inflammatory cytokine levels in the incised tissue were also determined. Mechanical pain hypersensitivity was significantly reduced in BLT1KO mice compared to BLT1WT mice at 2, 3, and 4 days after incision. LTB4 levels in the tissue at the incision site peaked 3 hours after the incision. Infiltrated neutrophils peaked 1 day after the incision in both BLT1KO and BLT1WT mice. The accumulation of inflammatory monocytes increased 1-3 days after the incision and was significantly more reduced in BLT1KO mice than in BLT1WT mice. In BLT1KO mice, Interleukin-1β and Tumor Necrosis Factor-α levels 1 day after the incision were significantly lower than those of BLT1WT mice. Our data suggest that LTB4 is produced and activates its receptor BLT1 in the very early phase of tissue injury, and that LTB4-BLT1 signaling exacerbates pain responses by promoting local infiltration of inflammatory monocytes and cytokine production. Thus, LTB4-BLT1 signaling is a potential target for therapeutic intervention of acute and persistent pain induced by tissue injury.
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Affiliation(s)
- Miho Asahara
- Department of Anesthesiology, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nobuko Ito
- Department of Anesthesiology, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
- * E-mail:
| | - Yoko Hoshino
- Department of Anesthesiology, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takaharu Sasaki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Motonao Nakamura
- Department of Life Science, Faculty of Science, Okayama University of Science, Okayama, Japan
| | - Takao Shimizu
- Department of Lipid Signaling, National Center for Global Health and Medicine, Tokyo, Japan
- Department of Lipidomics, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yoshitsugu Yamada
- International University of Health and Welfare, Mita Hospital, Tokyo, Japan
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Wang J, Song R, Lan R, Hao M, Liu G, Liu M, Sun S, Chen C, Che H. Peanut allergen induces more serious allergic reactions than other allergens involving MAPK signaling pathways. Food Funct 2022; 13:8818-8828. [PMID: 35920097 DOI: 10.1039/d2fo00777k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There is no universally accepted uniform research to classify the severity of allergic reactions triggered by different food allergens. We established a food allergy model based on repeated intragastric administrations of proteins from peanut, egg, milk, or soybean mixed with cholera toxin followed by oral food challenges with a high dose of the sensitizing proteins. Increased specific IgE, specific IgG1, allergic symptom scores, histamine, murine mast cell proteases-1, vascular leakage, Th2 cytokines, and mast cell infiltration in the lungs and intestine were found in the allergic groups via enzyme-linked immunosorbent assay, hematoxylin-eosin, and toluidine blue staining. Each sensitized group showed a decrease in body temperature and Th1 cytokines after oral food challenge. The increased levels of Th2 cytokines, IL-25, IL-33, and TSLP, and related asthma genes ARG1, DCN, LTB4R1 and NFKBIA as well as the activation of MAPK signaling pathways were also revealed by quantitative real-time PCR and western blotting. In terms of the severity of food allergies, peanut allergy was the most serious followed by egg and milk, and soybean allergy was the least severe. Compared to other allergic groups, asthma genes were regulated through the MAPK signaling pathways to produce related Th2 cytokines in peanut allergy; consequently, mice in the peanut group exhibited more severe allergic reactions. Comparison of the severity of food allergies is required for the development of milder prevention for severe food allergies.
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Affiliation(s)
- Junjuan Wang
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Ruolin Song
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Ruoxi Lan
- Wageningen University & Research, 6708 PB Wageningen, the Netherlands
| | - Mengzhen Hao
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Guirong Liu
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Manman Liu
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Shanfeng Sun
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Cheng Chen
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
| | - Huilian Che
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, P. R. China.
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7
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Recent advances in function and structure of two leukotriene B 4 receptors: BLT1 and BLT2. Biochem Pharmacol 2022; 203:115178. [PMID: 35850310 DOI: 10.1016/j.bcp.2022.115178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/12/2022] [Accepted: 07/12/2022] [Indexed: 11/21/2022]
Abstract
Leukotriene B4 (LTB4) is generated by the enzymatic oxidation of arachidonic acid, which is then released from the cell membrane and acts as a potent activator of leukocytes and other inflammatory cells. Numerous studies have demonstrated the physiological and pathophysiological significance of this lipid in various diseases. LTB4 exerts its activities by binding to its specific G protein-coupled receptors (GPCRs): BLT1 and BLT2. In mouse disease models, treatment with BLT1 antagonists or BLT1 gene ablation attenuated various diseases, including bronchial asthma, arthritis, and psoriasis, whereas BLT2 deficiency exacerbated several diseases in the skin, cornea, and small intestine. Therefore, BLT1 inhibitors and BLT2 activators could be beneficial for the treatment of several inflammatory and immune disorders. As a result, attractive compounds targeting LTB4 receptors have been developed by several pharmaceutical companies. This review aims to understand the potential of BLT1 and BLT2 as therapeutic targets for the treatment of various inflammatory diseases. In addition, recent topics are discussed with major focuses on the structure and post-translational modifications of BLT1 and BLT2. Collectively, current evidence on modulating LTB4 receptor functions provides new strategies for the treatment of various diseases.
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Human and Mouse Eosinophils Differ in Their Ability to Biosynthesize Eicosanoids, Docosanoids, the Endocannabinoid 2-Arachidonoyl-glycerol and Its Congeners. Cells 2022; 11:cells11010141. [PMID: 35011703 PMCID: PMC8750928 DOI: 10.3390/cells11010141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 12/20/2021] [Accepted: 12/22/2021] [Indexed: 12/13/2022] Open
Abstract
High eosinophil (EOS) counts are a key feature of eosinophilic asthma. EOS notably affect asthmatic response by generating several lipid mediators. Mice have been utilized in hopes of defining new pharmacological targets to treat asthma. However, many pinpointed targets in mice did not translate into clinics, underscoring that key differences exist between the two species. In this study, we compared the ability of human (h) and mouse (m) EOS to biosynthesize key bioactive lipids derived from arachidonic acid (AA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). hEOS were isolated from the blood of healthy subjects and mild asthmatics, while mEOSs were differentiated from the bone marrow. EOSs were treated with fatty acids and lipid mediator biosynthesis assessed by LC-MS/MS. We found that hEOS biosynthesized leukotriene (LT) C4 and LTB4 in a 5:1 ratio while mEOS almost exclusively biosynthesized LTB4. The biosynthesis of the 15-lipoxygenase (LO) metabolites 15-HETE and 12-HETE also differed, with a 15-HETE:12-HETE ratio of 6.3 for hEOS and 0.727 for mEOS. EOS biosynthesized some specialized pro-resolving mediators, and the levels from mEOS were 9-times higher than those of hEOS. In contrast, hEOS produced important amounts of the endocannabinoid 2-arachidonoyl-glycerol (2-AG) and its congeners from EPA and DHA, a biosynthetic pathway that was up to ~100-fold less prominent in mEOS. Our data show that hEOS and mEOS biosynthesize the same lipid mediators but in different amounts. Compared to asthmatics, mouse models likely have an amplified involvement of LTB4 and specialized pro-resolving mediators and a diminished impact of the endocannabinoid 2-arachidonoyl-glycerol and its congeners.
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Eicosanoid receptors as therapeutic targets for asthma. Clin Sci (Lond) 2021; 135:1945-1980. [PMID: 34401905 DOI: 10.1042/cs20190657] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 07/23/2021] [Accepted: 08/03/2021] [Indexed: 12/16/2022]
Abstract
Eicosanoids comprise a group of oxidation products of arachidonic and 5,8,11,14,17-eicosapentaenoic acids formed by oxygenases and downstream enzymes. The two major pathways for eicosanoid formation are initiated by the actions of 5-lipoxygenase (5-LO), leading to leukotrienes (LTs) and 5-oxo-6,8,11,14-eicosatetraenoic acid (5-oxo-ETE), and cyclooxygenase (COX), leading to prostaglandins (PGs) and thromboxane (TX). A third group (specialized pro-resolving mediators; SPMs), including lipoxin A4 (LXA4) and resolvins (Rvs), are formed by the combined actions of different oxygenases. The actions of the above eicosanoids are mediated by approximately 20 G protein-coupled receptors, resulting in a variety of both detrimental and beneficial effects on airway smooth muscle and inflammatory cells that are strongly implicated in asthma pathophysiology. Drugs targeting proinflammatory eicosanoid receptors, including CysLT1, the receptor for LTD4 (montelukast) and TP, the receptor for TXA2 (seratrodast) are currently in use, whereas antagonists of a number of other receptors, including DP2 (PGD2), BLT1 (LTB4), and OXE (5-oxo-ETE) are under investigation. Agonists targeting anti-inflammatory/pro-resolving eicosanoid receptors such as EP2/4 (PGE2), IP (PGI2), ALX/FPR2 (LXA4), and Chemerin1 (RvE1/2) are also being examined. This review summarizes the contributions of eicosanoid receptors to the pathophysiology of asthma and the potential therapeutic benefits of drugs that target these receptors. Because of the multifactorial nature of asthma and the diverse pathways affected by eicosanoid receptors, it will be important to identify subgroups of asthmatics that are likely to respond to any given therapy.
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Amison RT, Page CP. Novel pharmacological therapies for the treatment of bronchial asthma. Minerva Med 2021; 113:31-50. [PMID: 34236157 DOI: 10.23736/s0026-4806.21.07559-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Asthma has long been recognised as a chronic inflammatory disease of the airways, often in response to inhaled allergens prompting inappropriate activation of the immune response. involving a range of cells including mast cells, Th2 lymphocytes and eosinophils and a wide range of inflammatory mediators. First-line therapy for treatment of persistent asthma involves the use of inhaled corticosteroids (ICS) in combination with inhaled β2-agonists enabling both the control of the underlying airways inflammation and a reduction of airway hyperresponsiveness. However, many patients remain symptomatic despite high-dose therapy. There is therefore a continued unmet clinical need to develop specifically new anti-inflammatory therapies for patients with asthma, either as an add-on therapy to ICS or as replacement monotherapies. The success of fixed dose combination inhalers containing both a bronchodilator and an anti-inflammatory drug has also led to the development of "bifunctional" drugs which are molecules specifically designed to have two distinct pharmacological actions based on distinct pharmacophores. In this review we will discuss these different pharmacological approaches under development for the treatment of bronchial asthma and the available pre-clinical and clinical data.
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Affiliation(s)
- Richard T Amison
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK -
| | - Clive P Page
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
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11
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Nakamura T. The roles of lipid mediators in type I hypersensitivity. J Pharmacol Sci 2021; 147:126-131. [PMID: 34294363 DOI: 10.1016/j.jphs.2021.06.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/22/2021] [Accepted: 06/02/2021] [Indexed: 12/11/2022] Open
Abstract
Type I hypersensitivity is an immediate immune reaction that involves IgE-mediated activation of mast cells. Activated mast cells release chemical mediators, such as histamine and lipid mediators, which cause allergic reactions. Recent developments in detection devices have revealed that mast cells simultaneously release a wide variety of lipid mediators. Mounting evidence has revealed that mast cell-derived mediators exert both pro- and anti-inflammatory functions and positively and negatively regulate the development of allergic inflammation. This review presents the roles of major lipid mediators released from mast cells. Author believes this review will be helpful for a better understanding of the pathogenesis of allergic diseases and provide a new strategy for the diagnosis and treatment of allergic reactions.
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Affiliation(s)
- Tatsuro Nakamura
- Department of Animal Radiology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan.
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12
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Koga T, Sasaki F, Saeki K, Tsuchiya S, Okuno T, Ohba M, Ichiki T, Iwamoto S, Uzawa H, Kitajima K, Meno C, Nakamura E, Tada N, Fukui Y, Kikuta J, Ishii M, Sugimoto Y, Nakao M, Yokomizo T. Expression of leukotriene B 4 receptor 1 defines functionally distinct DCs that control allergic skin inflammation. Cell Mol Immunol 2021; 18:1437-1449. [PMID: 33037399 PMCID: PMC8167169 DOI: 10.1038/s41423-020-00559-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 09/10/2020] [Accepted: 09/11/2020] [Indexed: 11/25/2022] Open
Abstract
Leukotriene B4 (LTB4) receptor 1 (BLT1) is a chemotactic G protein-coupled receptor expressed by leukocytes, such as granulocytes, macrophages, and activated T cells. Although there is growing evidence that BLT1 plays crucial roles in immune responses, its role in dendritic cells remains largely unknown. Here, we identified novel DC subsets defined by the expression of BLT1, namely, BLT1hi and BLT1lo DCs. We also found that BLT1hi and BLT1lo DCs differentially migrated toward LTB4 and CCL21, a lymph node-homing chemoattractant, respectively. By generating LTB4-producing enzyme LTA4H knockout mice and CD11c promoter-driven Cre recombinase-expressing BLT1 conditional knockout (BLT1 cKO) mice, we showed that the migration of BLT1hi DCs exacerbated allergic contact dermatitis. Comprehensive transcriptome analysis revealed that BLT1hi DCs preferentially induced Th1 differentiation by upregulating IL-12p35 expression, whereas BLT1lo DCs accelerated T cell proliferation by producing IL-2. Collectively, the data reveal an unexpected role for BLT1 as a novel DC subset marker and provide novel insights into the role of the LTB4-BLT1 axis in the spatiotemporal regulation of distinct DC subsets.
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Affiliation(s)
- Tomoaki Koga
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
- Department of Medical Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, 860-0811, Japan
| | - Fumiyuki Sasaki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
- Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Soken Tsuchiya
- Department of Pharmaceutical Biochemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, 862-0973, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Mai Ohba
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Takako Ichiki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Satoshi Iwamoto
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Hirotsugu Uzawa
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Keiko Kitajima
- Department of Developmental Biology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Chikara Meno
- Department of Developmental Biology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Eri Nakamura
- Laboratory of Genome Research, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Norihiro Tada
- Laboratory of Genome Research, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Yoshinori Fukui
- Division of Immunogenetics, Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Fukuoka, 812-8582, Japan
| | - Junichi Kikuta
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, 565-0871, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, 565-0871, Japan
| | - Yukihiko Sugimoto
- Department of Pharmaceutical Biochemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, 862-0973, Japan
| | - Mitsuyoshi Nakao
- Department of Medical Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, 860-0811, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan.
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13
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Kwak DW, Park D, Kim JH. Leukotriene B 4 receptors play critical roles in house dust mites-induced neutrophilic airway inflammation and IL-17 production. Biochem Biophys Res Commun 2020; 534:646-652. [PMID: 33256981 DOI: 10.1016/j.bbrc.2020.11.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 11/06/2020] [Indexed: 01/29/2023]
Abstract
Increased levels of neutrophils in bronchoalveolar lavage fluid (BALF) were associated with asthma severity. As leukotriene B4 (LTB4) is a principal chemoattractant molecule for neutrophils, its receptors, BLT1 and BLT2, may contribute to neutrophil-dominant airway inflammation. In the present study, we established a mouse model of steroid-resistant, neutrophil-dominant airway inflammation by house dust mite (HDM)/lipopolysaccharide (LPS) sensitization and HDM challenge, and we investigated whether BLT1/BLT2 signaling was associated with the development of neutrophilic airway inflammation. Blockade of BLT1 or BLT2 significantly suppressed airway inflammation and IL-17 production in this mouse model. The 5-LO and 12-LO enzymes, which catalyze the synthesis of BLT1/BLT2 ligands, were also critically associated with neutrophil-dominant airway inflammation and the synthesis of IL-17. Collectively, our results suggest that the 5-/12-LO-BLT1/BLT2-linked cascade significantly contributes to neutrophil-dominant severe airway inflammation via IL-17 synthesis in HDM-induced neutrophilic asthma.
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Affiliation(s)
- Dong-Wook Kwak
- Department of Biotechnology, College of Life Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Donghwan Park
- Department of Biotechnology, College of Life Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Jae-Hong Kim
- Department of Biotechnology, College of Life Sciences, Korea University, Seoul, 02841, Republic of Korea.
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14
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Uzawa H, Kohno D, Koga T, Sasaki T, Fukunaka A, Okuno T, Jo-Watanabe A, Kazuno S, Miyatsuka T, Kitamura T, Fujitani Y, Watada H, Saeki K, Yokomizo T. Leukotriene A 4 hydrolase deficiency protects mice from diet-induced obesity by increasing energy expenditure through neuroendocrine axis. FASEB J 2020; 34:13949-13958. [PMID: 32844470 DOI: 10.1096/fj.202001148r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 12/20/2022]
Abstract
Obesity is a health problem worldwide, and brown adipose tissue (BAT) is important for energy expenditure. Here, we explored the role of leukotriene A4 hydrolase (LTA4 H), a key enzyme in the synthesis of the lipid mediator leukotriene B4 (LTB4 ), in diet-induced obesity. LTA4 H-deficient (LTA4 H-KO) mice fed a high-fat diet (HFD) showed a lean phenotype, and bone-marrow transplantation studies revealed that LTA4 H-deficiency in non-hematopoietic cells was responsible for this lean phenotype. LTA4 H-KO mice exhibited greater energy expenditure, but similar food intake and fecal energy loss. LTA4 H-KO BAT showed higher expression of thermogenesis-related genes. In addition, the plasma thyroid-stimulating hormone and thyroid hormone concentrations, as well as HFD-induced catecholamine secretion, were higher in LTA4 H-KO mice. In contrast, LTB4 receptor (BLT1)-deficient mice did not show a lean phenotype, implying that the phenotype of LTA4 H-KO mice is independent of the LTB4 /BLT1 axis. These results indicate that LTA4 H mediates the diet-induced obesity by reducing catecholamine and thyroid hormone secretion.
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Affiliation(s)
- Hirotsugu Uzawa
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan.,Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Daisuke Kohno
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Tomoaki Koga
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan.,Department of Medical Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, Japan
| | - Tsutomu Sasaki
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan.,Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Ayako Fukunaka
- Laboratory of Developmental Biology and Metabolism, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Airi Jo-Watanabe
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Saiko Kazuno
- Laboratory of Proteomics and Biomolecular Science, Research Support Center, Juntendo University School of Medicine, Tokyo, Japan
| | - Takeshi Miyatsuka
- Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Tadahiro Kitamura
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Yoshio Fujitani
- Laboratory of Developmental Biology and Metabolism, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Hirotaka Watada
- Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
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15
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Yang M, Bair JA, Hodges RR, Serhan CN, Dartt DA. Resolvin E1 Reduces Leukotriene B4-Induced Intracellular Calcium Increase and Mucin Secretion in Rat Conjunctival Goblet Cells. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:1823-1832. [PMID: 32561135 DOI: 10.1016/j.ajpath.2020.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 06/01/2020] [Accepted: 06/02/2020] [Indexed: 01/25/2023]
Abstract
Leukotriene B4 (LTB4) is a major proinflammatory mediator important in host defense, whereas resolvins (Rvs) are produced during the resolution phase of inflammation. The authors determined the actions of both RvE1 and RvD1 on LTB4-induced responses of goblet cells cultured from rat conjunctiva. The responses measured were an increase in the intracellular [Ca2+] ([Ca2+]i) and high-molecular-weight glycoprotein secretion. Treatment with RvE1 or RvD1 for 30 minutes significantly blocked the LTB4-induced [Ca2+]i increase. The actions of RvE1 on LTB4-induced [Ca2+]i increase were reversed by siRNA for the RvE1 receptor, and the actions of RvD1 were reversed by an RvD1 receptor inhibitor. The RvE1 and RvD1 block of LTB4-stimulated increase in [Ca2+]i was also reversed by an inhibitory peptide to β-adrenergic receptor kinase. LTB4 and block of the LTB4-stimulated increase in [Ca2+]i by RvE1 and RvD1 were partially mediated by the depletion of intracellular Ca2+ stores. RvE1, but not RvD1, counterregulated the LTB4-induced high-molecular-weight glycoprotein secretion. Thus, both RvE1 and RvD1 receptors directly inhibit LTB4 by phosphorylating the LTB4 receptor using β adrenergic receptor kinase. RvE1 receptor counterregulates the LTB4-induced increase in [Ca2+]i and secretion, whereas RvD1 receptor only counterregulates LTB4-induced [Ca2+]i increase.
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Affiliation(s)
- Menglu Yang
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Jeffrey A Bair
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Robin R Hodges
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Charles N Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Department of Anaesthesia, Perioperative and Pain Medicine, Harvard Medical School, Boston, Massachusetts
| | - Darlene A Dartt
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.
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16
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Hirakata T, Matsuda A, Yokomizo T. Leukotriene B 4 receptors as therapeutic targets for ophthalmic diseases. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158756. [PMID: 32535236 DOI: 10.1016/j.bbalip.2020.158756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 06/01/2020] [Accepted: 06/04/2020] [Indexed: 11/26/2022]
Abstract
Leukotriene B4 (LTB4) is an inflammatory lipid mediator produced from arachidonic acid by multiple reactions catalyzed by two enzymes 5-lipoxygenase (5-LOX) and LTA4 hydrolase (LTA4H). The two receptors for LTB4 have been identified: a high-affinity receptor, BLT1, and a low-affinity receptor, BLT2. Our group identified 12(S)-hydroxy-5Z,8E,10E-heptadecatrienoic acid (12-HHT) as a high-affinity BLT2 ligand. Numerous studies have revealed critical roles for LTB4 and its receptors in various systemic diseases. Recently, we also reported the roles of LTB4, BLT1 and BLT2 in the murine ophthalmic disease models of mice including cornea wound, allergic conjunctivitis, and age-related macular degeneration. Moreover, other groups revealed the evidence of the ocular function of LTB4. In the present review, we introduce the roles of LTB4 and its receptors both in ophthalmic diseases and systemic inflammatory diseases. LTB4 and its receptors are putative novel therapeutic targets for systemic and ophthalmic diseases.
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Affiliation(s)
- Toshiaki Hirakata
- Department of Ophthalmology, Juntendo University Graduate School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, Japan; Department of Biochemistry, Juntendo University Graduate School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, Japan
| | - Akira Matsuda
- Department of Ophthalmology, Juntendo University Graduate School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, Japan.
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17
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Hosooka T, Hosokawa Y, Matsugi K, Shinohara M, Senga Y, Tamori Y, Aoki C, Matsui S, Sasaki T, Kitamura T, Kuroda M, Sakaue H, Nomura K, Yoshino K, Nabatame Y, Itoh Y, Yamaguchi K, Hayashi Y, Nakae J, Accili D, Yokomizo T, Seino S, Kasuga M, Ogawa W. The PDK1-FoxO1 signaling in adipocytes controls systemic insulin sensitivity through the 5-lipoxygenase-leukotriene B 4 axis. Proc Natl Acad Sci U S A 2020; 117:11674-11684. [PMID: 32393635 PMCID: PMC7261087 DOI: 10.1073/pnas.1921015117] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Although adipocytes are major targets of insulin, the influence of impaired insulin action in adipocytes on metabolic homeostasis remains unclear. We here show that adipocyte-specific PDK1 (3'-phosphoinositide-dependent kinase 1)-deficient (A-PDK1KO) mice manifest impaired metabolic actions of insulin in adipose tissue and reduction of adipose tissue mass. A-PDK1KO mice developed insulin resistance, glucose intolerance, and hepatic steatosis, and this phenotype was suppressed by additional ablation of FoxO1 specifically in adipocytes (A-PDK1/FoxO1KO mice) without an effect on adipose tissue mass. Neither circulating levels of adiponectin and leptin nor inflammatory markers in adipose tissue differed between A-PDK1KO and A-PDK1/FoxO1KO mice. Lipidomics and microarray analyses revealed that leukotriene B4 (LTB4) levels in plasma and in adipose tissue as well as the expression of 5-lipoxygenase (5-LO) in adipose tissue were increased and restored in A-PDK1KO mice and A-PDK1/FoxO1KO mice, respectively. Genetic deletion of the LTB4 receptor BLT1 as well as pharmacological intervention to 5-LO or BLT1 ameliorated insulin resistance in A-PDK1KO mice. Furthermore, insulin was found to inhibit LTB4 production through down-regulation of 5-LO expression via the PDK1-FoxO1 pathway in isolated adipocytes. Our results indicate that insulin signaling in adipocytes negatively regulates the production of LTB4 via the PDK1-FoxO1 pathway and thereby maintains systemic insulin sensitivity.
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Affiliation(s)
- Tetsuya Hosooka
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Yusei Hosokawa
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Kaku Matsugi
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Masakazu Shinohara
- Division of Epidemiology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
- The Integrated Center for Mass Spectrometry, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Yoko Senga
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Yoshikazu Tamori
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
- Department of Internal Medicine, Chibune General Hospital, 555-0001 Osaka, Japan
| | - Chikako Aoki
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Sho Matsui
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 371-8512 Maebashi, Japan
| | - Tsutomu Sasaki
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 371-8512 Maebashi, Japan
| | - Tadahiro Kitamura
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 371-8512 Maebashi, Japan
| | - Masashi Kuroda
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 770-8503 Tokushima, Japan
| | - Hiroshi Sakaue
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 770-8503 Tokushima, Japan
| | - Kazuhiro Nomura
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Kei Yoshino
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Yuko Nabatame
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Yoshito Itoh
- Department of Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, 602-8566 Kyoto, Japan
| | - Kanji Yamaguchi
- Department of Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, 602-8566 Kyoto, Japan
| | - Yoshitake Hayashi
- Division of Molecular Medicine and Medical Genetics, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Jun Nakae
- Department of Internal Medicine, Keio University School of Medicine, 160-8582 Tokyo, Japan
| | - Domenico Accili
- Department of Medicine and Naomi Berrie Diabetes Center, Columbia University, NY 10032
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, 113-8421 Tokyo, Japan
| | - Susumu Seino
- Division of Molecular and Metabolic Medicine, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan
| | - Masato Kasuga
- The Institute for Adult Diseases, Asahi Life Foundation, 103-0002 Tokyo, Japan
| | - Wataru Ogawa
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, 650-0017 Kobe, Japan;
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18
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He R, Chen Y, Cai Q. The role of the LTB4-BLT1 axis in health and disease. Pharmacol Res 2020; 158:104857. [PMID: 32439596 DOI: 10.1016/j.phrs.2020.104857] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 04/03/2020] [Accepted: 04/20/2020] [Indexed: 12/16/2022]
Abstract
Leukotriene B4 (LTB4) is a major type of lipid mediator that is rapidly generated from arachidonic acid through sequential action of 5-lipoxygenase (5-LO), 5-lipoxygenase-activating protein (FLAP) and LTA4 hydrolase (LTA4H) in response to various stimuli. LTB4 is well known to be a chemoattractant for leukocytes, particularly neutrophils, via interaction with its high-affinity receptor BLT1. Extensive attention has been paid to the role of the LTB4-BLT1 axis in acute and chronic inflammatory diseases, such as infectious diseases, allergy, autoimmune diseases, and metabolic disease via mediating recruitment and/or activation of different types of inflammatory cells depending on different stages or the nature of inflammatory response. Recent studies also demonstrated that LTB4 acts on non-immune cells via BLT1 to initiate and/or amplify pathological inflammation in various tissues. In addition, emerging evidence reveals a complex role of the LTB4-BLT1 axis in cancer, either tumor-inhibitory or tumor-promoting, depending on the different target cells. In this review, we summarize both established understanding and the most recent progress in our knowledge about the LTB4-BLT1 axis in host defense, inflammatory diseases and cancer.
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Affiliation(s)
- Rui He
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, People's Republic of China.
| | - Yu Chen
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, People's Republic of China
| | - Qian Cai
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, People's Republic of China
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19
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Horii Y, Nakaya M, Ohara H, Nishihara H, Watari K, Nagasaka A, Nakaya T, Sugiura Y, Okuno T, Koga T, Tanaka A, Yokomizo T, Kurose H. Leukotriene B 4 receptor 1 exacerbates inflammation following myocardial infarction. FASEB J 2020; 34:8749-8763. [PMID: 32385915 DOI: 10.1096/fj.202000041r] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 04/15/2020] [Accepted: 04/21/2020] [Indexed: 01/17/2023]
Abstract
Leukotriene B4 receptor 1 (BLT1), a high-affinity G-protein-coupled receptor for leukotriene B4 (LTB4 ), is expressed on various inflammatory cells and plays critical roles in several inflammatory diseases. In myocardial infarction (MI), various inflammatory cells are known to be recruited to the infarcted area, but the function of BLT1 in MI is poorly understood. Here, we investigated the role of BLT1 in MI and the therapeutic effect of a BLT1 antagonist, ONO-4057, on MI. Mice with infarcted hearts showed increased BLT1 expression and LTB4 levels. BLT1-knockout mice with infarcted hearts exhibited attenuated leukocyte infiltration, proinflammatory cytokine production, and cell death, which led to reduced mortality and improved cardiac function after MI. Bone-marrow transplantation studies showed that BLT1 expressed on bone marrow-derived cells was responsible for the exacerbation of inflammation in infarcted hearts. Furthermore, ONO-4057 administration attenuated the inflammatory responses in hearts surgically treated for MI, which resulted in reduced mortality and improved cardiac function after MI. Our study demonstrated that BLT1 contributes to excessive inflammation after MI and could represent a new therapeutic target for MI.
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Affiliation(s)
- Yuma Horii
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Michio Nakaya
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan.,AMED-PRIME, Japan Agency for Medical Research and Development, Tokyo, Japan
| | - Hiroki Ohara
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Hiroaki Nishihara
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Kenji Watari
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Akiomi Nagasaka
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Takeo Nakaya
- Department of Pathology, Jichi Medical University, Tochigi, Japan
| | - Yuki Sugiura
- Department of Biochemistry, Keio University School of Medicine, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Tomoaki Koga
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Akira Tanaka
- Department of Pathology, Jichi Medical University, Tochigi, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hitoshi Kurose
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
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20
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Sasaki F, Yokomizo T. The leukotriene receptors as therapeutic targets of inflammatory diseases. Int Immunol 2020; 31:607-615. [PMID: 31135881 DOI: 10.1093/intimm/dxz044] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 05/27/2019] [Indexed: 12/11/2022] Open
Abstract
Leukotrienes (LTs) are inflammatory mediators derived from arachidonic acid. LTs include the di-hydroxy acid LT (LTB4) and the cysteinyl LTs (CysLTs; LTC4, LTD4 and LTE4), all of which are involved in both acute and chronic inflammation. We and other groups identified a high-affinity LTB4 receptor, BLT1; the LTC4 and LTD4 receptors, CysLT1 and CysLT2; and the LTE4 receptor, GPR99. Pharmacological studies have shown that BLT1 signaling stimulates degranulation, chemotaxis and phagocytosis of neutrophils, whereas CysLT1 and CysLT2 signaling induces airway inflammation by increasing vascular permeability and the contraction of bronchial smooth muscle. Recently, we and other groups suggested that the LTB4-BLT1 axis and the cysteinyl LTs-CysLT1/2 axis are involved in chronic inflammatory diseases including asthma, atopic dermatitis, psoriasis, atherosclerosis, arthritis, obesity, cancer and age-related macular degeneration using animal models for disease and gene knockout mice. This review describes the classical and novel functions of LTs and their receptors in several inflammatory diseases and discusses the potential clinical applications of antagonists for LT receptors and inhibitors of LT biosynthesis.
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Affiliation(s)
- Fumiyuki Sasaki
- Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
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21
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Abstract
Asthma is a heterogeneous inflammatory disease of the airways that is associated with airway hyperresponsiveness and airflow limitation. Although asthma was once simply categorized as atopic or nonatopic, emerging analyses over the last few decades have revealed a variety of asthma endotypes that are attributed to numerous pathophysiological mechanisms. The classification of asthma by endotype is primarily routed in different profiles of airway inflammation that contribute to bronchoconstriction. Many asthma therapeutics target G protein-coupled receptors (GPCRs), which either enhance bronchodilation or prevent bronchoconstriction. Short-acting and long-acting β 2-agonists are widely used bronchodilators that signal through the activation of the β 2-adrenergic receptor. Short-acting and long-acting antagonists of muscarinic acetylcholine receptors are used to reduce bronchoconstriction by blocking the action of acetylcholine. Leukotriene antagonists that block the signaling of cysteinyl leukotriene receptor 1 are used as an add-on therapy to reduce bronchoconstriction and inflammation induced by cysteinyl leukotrienes. A number of GPCR-targeting asthma drug candidates are also in different stages of development. Among them, antagonists of prostaglandin D2 receptor 2 have advanced into phase III clinical trials. Others, including antagonists of the adenosine A2B receptor and the histamine H4 receptor, are in early stages of clinical investigation. In the past decade, significant research advancements in pharmacology, cell biology, structural biology, and molecular physiology have greatly deepened our understanding of the therapeutic roles of GPCRs in asthma and drug action on these GPCRs. This review summarizes our current understanding of GPCR signaling and pharmacology in the context of asthma treatment. SIGNIFICANCE STATEMENT: Although current treatment methods for asthma are effective for a majority of asthma patients, there are still a large number of patients with poorly controlled asthma who may experience asthma exacerbations. This review summarizes current asthma treatment methods and our understanding of signaling and pharmacology of G protein-coupled receptors (GPCRs) in asthma therapy, and discusses controversies regarding the use of GPCR drugs and new opportunities in developing GPCR-targeting therapeutics for the treatment of asthma.
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Affiliation(s)
- Stacy Gelhaus Wendell
- Department of Pharmacology and Chemical Biology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania (S.G.W., C.Z.); Bioinformatics Institute, Agency for Science, Technology, and Research, Singapore (H.F.); and Department of Biological Sciences, National University of Singapore, and Center for Computational Biology, DUKE-NUS Medical School, Singapore (H.F.)
| | - Hao Fan
- Department of Pharmacology and Chemical Biology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania (S.G.W., C.Z.); Bioinformatics Institute, Agency for Science, Technology, and Research, Singapore (H.F.); and Department of Biological Sciences, National University of Singapore, and Center for Computational Biology, DUKE-NUS Medical School, Singapore (H.F.)
| | - Cheng Zhang
- Department of Pharmacology and Chemical Biology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania (S.G.W., C.Z.); Bioinformatics Institute, Agency for Science, Technology, and Research, Singapore (H.F.); and Department of Biological Sciences, National University of Singapore, and Center for Computational Biology, DUKE-NUS Medical School, Singapore (H.F.)
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22
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Patel DF, Peiró T, Shoemark A, Akthar S, Walker SA, Grabiec AM, Jackson PL, Hussell T, Gaggar A, Xu X, Trevor JL, Li J, Steele C, Tavernier G, Blalock JE, Niven RM, Gregory LG, Simpson A, Lloyd CM, Snelgrove RJ. An extracellular matrix fragment drives epithelial remodeling and airway hyperresponsiveness. Sci Transl Med 2019; 10:10/455/eaaq0693. [PMID: 30135247 DOI: 10.1126/scitranslmed.aaq0693] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 07/20/2018] [Indexed: 12/17/2022]
Abstract
It is anticipated that bioactive fragments of the extracellular matrix (matrikines) can influence the development and progression of chronic diseases. The enzyme leukotriene A4 hydrolase (LTA4H) mediates opposing proinflammatory and anti-inflammatory activities, through the generation of leukotriene B4 (LTB4) and degradation of proneutrophilic matrikine Pro-Gly-Pro (PGP), respectively. We show that abrogation of LTB4 signaling ameliorated inflammation and airway hyperresponsiveness (AHR) in a murine asthma model, yet global loss of LTA4H exacerbated AHR, despite the absence of LTB4 This exacerbated AHR was attributable to a neutrophil-independent capacity of PGP to promote pathological airway epithelial remodeling. Thus, we demonstrate a disconnect between airway inflammation and AHR and the ability of a matrikine to promote an epithelial remodeling phenotype that negatively affects lung function. Subsequently, we show that substantial quantities of PGP are detectable in the sputum of moderate-severe asthmatics in two distinct cohorts of patients. These studies have implications for our understanding of remodeling phenotypes in asthma and may rationalize the failure of LTA4H inhibitors in the clinic.
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Affiliation(s)
- Dhiren F Patel
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Teresa Peiró
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK.,Departamento de Ciencias Biomédicas, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia 46115, Spain
| | - Amelia Shoemark
- Royal Brompton and Harefield National Health Service (NHS) Trust, London SW3 6NP, UK
| | - Samia Akthar
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Simone A Walker
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Aleksander M Grabiec
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester M13 9NT, UK.,Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków 30-387, Poland
| | - Patricia L Jackson
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.,Birmingham VA Medical Center, Birmingham, AL 35233, USA
| | - Tracy Hussell
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester M13 9NT, UK
| | - Amit Gaggar
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.,Birmingham VA Medical Center, Birmingham, AL 35233, USA
| | - Xin Xu
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.,Birmingham VA Medical Center, Birmingham, AL 35233, USA
| | - Jennifer L Trevor
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.,Birmingham VA Medical Center, Birmingham, AL 35233, USA
| | - Jindong Li
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.,Birmingham VA Medical Center, Birmingham, AL 35233, USA
| | - Chad Steele
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Gael Tavernier
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9NT, UK.,Manchester University NHS Foundation Trust, Manchester M23 9LT, UK
| | - J Edwin Blalock
- Division of Pulmonary, Allergy and Critical Care Medicine, Program in Protease and Matrix Biology, Gregory Fleming James Cystic Fibrosis Centre and Lung Health Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Robert M Niven
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9NT, UK.,Manchester University NHS Foundation Trust, Manchester M23 9LT, UK
| | - Lisa G Gregory
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Angela Simpson
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9NT, UK.,Manchester University NHS Foundation Trust, Manchester M23 9LT, UK
| | - Clare M Lloyd
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Robert J Snelgrove
- Inflammation Repair and Development, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK.
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Ro M, Kwon S, Kim J. Leukotriene B 4 receptors mediate the production of IL-17, thus contributing to neutrophil-dominant asthmatic airway inflammation. Allergy 2019; 74:1797-1799. [PMID: 30897215 PMCID: PMC6790678 DOI: 10.1111/all.13789] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- MyungJa Ro
- Department of Biotechnology, College of Life Sciences and Biotechnology Korea University Seoul South Korea
| | - Sun‐Young Kwon
- Department of Biotechnology, College of Life Sciences and Biotechnology Korea University Seoul South Korea
| | - Jae‐Hong Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology Korea University Seoul South Korea
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24
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BLT1 mediates commensal bacteria-dependent innate immune signals to enhance antigen-specific intestinal IgA responses. Mucosal Immunol 2019; 12:1082-1091. [PMID: 31142830 DOI: 10.1038/s41385-019-0175-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 04/26/2019] [Accepted: 05/08/2019] [Indexed: 02/06/2023]
Abstract
Leukotriene B4 receptor 1 (BLT1) triggers the migration of granulocytes and activated T cells; however, its role in B-cell function remains unclear. Here we report that BLT1 is required to induce the production of antigen-specific IgA against oral vaccine through mediating innate immune signals from commensal bacteria. B cells acquire BLT1 expression during their differentiation to IgA+ B cells and plasma cells in Peyer's patches and the small intestinal lamina propria, respectively. BLT1 KO mice exhibited impaired production of antigen-specific fecal IgA to oral vaccine despite normal IgG responses to systemically immunized antigen. Expression of MyD88 was decreased in BLT1 KO gut B cells and consequently led to diminished proliferation of commensal bacteria-dependent plasma cells. These results indicate that BLT1 enhances the proliferation of commensal bacteria-dependent IgA+ plasma cells through the induction of MyD88 and thereby plays a key role in the production of antigen-specific intestinal IgA.
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25
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The roles of omega-3 fatty acids and resolvins in allergic conjunctivitis. Curr Opin Allergy Clin Immunol 2019; 19:517-525. [PMID: 31465315 DOI: 10.1097/aci.0000000000000561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
PURPOSE OF REVIEW Lipids are one of the most important constituents in our body. Advances of lipidomics are elucidating the new roles of various lipid molecules in allergic diseases. For example, some reports showed anti-inflammatory effects of omega-3 fatty acids (FAs), such as docosahexaenoic acid, eicosapentaenoic acid, and their metabolites, on allergic diseases. Here, we introduce the role of lipid mediators in allergic conjunctivitis mouse model. RECENT FINDINGS Lipidomics using liquid chromatography-tandem mass spectrometry can profile numerous lipid molecules from small tissue samples such as conjunctival specimens. Lipidomics analysis showed that various inflammatory lipid mediators are produced in the conjunctival tissue of allergic conjunctivitis mouse model. Dietary omega-3 FAs reduced these inflammatory lipid mediators in the conjunctiva and alleviated allergic conjunctivitis symptoms in mouse models. In addition, the roles of specialized proresolving lipid mediators (SPMs) have been reported for allergic inflammation. SUMMARY Lipid mediators have important roles for the pathophysiology of the allergic diseases including allergic conjunctivitis. Omega-3 FAs and SPMs are expected as new treatment tools for allergic conjunctivitis.
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26
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Méndez-Enríquez E, Hallgren J. Mast Cells and Their Progenitors in Allergic Asthma. Front Immunol 2019; 10:821. [PMID: 31191511 PMCID: PMC6548814 DOI: 10.3389/fimmu.2019.00821] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 03/28/2019] [Indexed: 12/16/2022] Open
Abstract
Mast cells and their mediators have been implicated in the pathogenesis of asthma and allergy for decades. Allergic asthma is a complex chronic lung disease in which several different immune cells, genetic factors and environmental exposures influence the pathology. Mast cells are key players in the asthmatic response through secretion of a multitude of mediators with pro-inflammatory and airway-constrictive effects. Well-known mast cell mediators, such as histamine and bioactive lipids are responsible for many of the physiological effects observed in the acute phase of allergic reactions. The accumulation of mast cells at particular sites of the allergic lung is likely relevant to the asthma phenotype, severity and progression. Mast cells located in different compartments in the lung and airways have different characteristics and express different mediators. According to in vivo experiments in mice, lung mast cells develop from mast cell progenitors induced by inflammatory stimuli to migrate to the airways. Human mast cell progenitors have been identified in the blood circulation. A high frequency of circulating human mast cell progenitors may reflect ongoing pathological changes in the allergic lung. In allergic asthma, mast cells become activated mainly via IgE-mediated crosslinking of the high affinity receptor for IgE (FcεRI) with allergens. However, mast cells can also be activated by numerous other stimuli e.g. toll-like receptors and MAS-related G protein-coupled receptor X2. In this review, we summarize research with implications on the role and development of mast cells and their progenitors in allergic asthma and cover selected activation pathways and mast cell mediators that have been implicated in the pathogenesis. The review places an emphasis on describing mechanisms identified using in vivo mouse models and data obtained by analysis of clinical samples.
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Affiliation(s)
- Erika Méndez-Enríquez
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Jenny Hallgren
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
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27
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Role of the high-affinity leukotriene B4 receptor signaling in fibrosis after unilateral ureteral obstruction in mice. PLoS One 2019; 14:e0202842. [PMID: 30818366 PMCID: PMC6394974 DOI: 10.1371/journal.pone.0202842] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Accepted: 02/10/2019] [Indexed: 12/28/2022] Open
Abstract
Leukotriene B4 (LTB4) is a lipid mediator that acts as a potent chemoattractant for inflammatory leukocytes. Kidney fibrosis is caused by migrating inflammatory cells and kidney-resident cells. Here, we examined the role of the high-affinity LTB4 receptor BLT1 during development of kidney fibrosis induced by unilateral ureteral obstruction (UUO) in wild-type (WT) mice and BLT1 knockout (BLT1-/-) mice. We found elevated expression of 5-lipoxygenase (5-LOX), which generates LTB4, in the renal tubules of UUO kidneys from WT mice and BLT1-/- mice. Accumulation of immunoreactive type I collagen in WT UUO kidneys increased over time; however, the increase was less prominent in BLT1-/- UUO kidneys. Accumulation of S100A4-positive fibroblasts increased temporally in WT UUO kidneys, but was again less pronounced in-BLT1-/- UUO kidneys. The same was true of mRNA encoding transforming growth factor-β (TGF)-β and fibroblast growth factor (FGF)-2. Finally, accumulation of F4/80-positive macrophages, which secrete TGF-β, increased temporally in WT UUO and BLT1-/- UUO kidneys, but to a lesser extent in the latter. Following LTB4 stimulation in vitro, macrophages showed increased expression of mRNA encoding TGF-β/FGF-2 and Col1a1, whereas L929 fibroblasts showed increased expression of mRNA encoding α smooth muscle actin (SMA). Bone marrow (BM) transplantation studies revealed that the area positive for type I collagen was significantly smaller in BLT1-/—BM→WT than in WT-BM→WT. Thus, LTB4-BLT1 signaling plays a critical role in fibrosis in UUO kidneys by increasing accumulation of macrophages and fibroblasts. Therefore, blocking BLT1 may prevent renal fibrosis.
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28
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Rossi A, Roviezzo F, Sorrentino R, Riemma MA, Cerqua I, Bilancia R, Spaziano G, Troisi F, Pace S, Pinto A, D'Agostino B, Werz O, Cirino G. Leukotriene-mediated sex dimorphism in murine asthma-like features during allergen sensitization. Pharmacol Res 2018; 139:182-190. [PMID: 30468889 DOI: 10.1016/j.phrs.2018.11.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 11/16/2018] [Accepted: 11/16/2018] [Indexed: 12/26/2022]
Abstract
The incidence and severity of asthma preponderate in women versus men. Leukotrienes (LTs) are lipid mediators involved in asthma pathogenesis, and sex disparities in LT biosynthesis and anti-LT pharmacology in inflammation have recently emerged. Here, we report on sex dimorphism in LT production during allergen sensitization and its correlation to lung function. While high plasma levels of IgE, as sensitization index, were elevated in both sexes, LT levels increased only in lungs of female ovalbumin-sensitized BALB/c mice. Sex-dependent elevated LT levels strictly correlated to an enhanced airway hyperreactivity, pulmonary inflammation and mast cell infiltration/activation in female mice. Importantly, this sex bias was coupled to superior therapeutic efficacy of different types of clinically used LT modifiers like zileuton, MK886 and montelukast in female animals. Our findings reveal sex-dependent LT production as a basic mechanism of sex dimorphism in allergic asthma, and suggest that women might benefit more from anti-LT asthma therapy.
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Affiliation(s)
- Antonietta Rossi
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
| | - Fiorentina Roviezzo
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
| | - Rosalinda Sorrentino
- Department of Pharmacy (DIFARMA), University of Salerno, Via Giovanni Paolo II 132 Fisciano, I-84084 Salerno, Italy.
| | - Maria A Riemma
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
| | - Ida Cerqua
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
| | - Rossella Bilancia
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
| | - Giuseppe Spaziano
- Department of Experimental Medicine L. Donatelli, Section of Pharmacology, School of Medicine, University of Campania Luigi Vanvitelli, Via Costantinopoli 16, I-80131 Naples, Italy.
| | - Fabiana Troisi
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Philosophenweg 14, D-07743 Jena, Germany.
| | - Simona Pace
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Philosophenweg 14, D-07743 Jena, Germany.
| | - Aldo Pinto
- Department of Pharmacy (DIFARMA), University of Salerno, Via Giovanni Paolo II 132 Fisciano, I-84084 Salerno, Italy.
| | - Bruno D'Agostino
- Department of Experimental Medicine L. Donatelli, Section of Pharmacology, School of Medicine, University of Campania Luigi Vanvitelli, Via Costantinopoli 16, I-80131 Naples, Italy.
| | - Oliver Werz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Philosophenweg 14, D-07743 Jena, Germany.
| | - Giuseppe Cirino
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Via D. Montesano 49, I-80131 Naples, Italy.
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29
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Hirakata T, Lee HC, Ohba M, Saeki K, Okuno T, Murakami A, Matsuda A, Yokomizo T. Dietary ω-3 fatty acids alter the lipid mediator profile and alleviate allergic conjunctivitis without modulating T h2 immune responses. FASEB J 2018; 33:3392-3403. [PMID: 30383446 PMCID: PMC6404575 DOI: 10.1096/fj.201801805r] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Allergic conjunctivitis (AC) is one of the most common ocular surface diseases in the world. In AC, T helper type 2 (Th2) immune responses play central roles in orchestrating inflammatory responses. However, the roles of lipid mediators in the onset and progression of AC remain to be fully explored. Although previous reports have shown the beneficial effects of supplementation of ω-3 fatty acids in asthma or atopic dermatitis, the underlying molecular mechanisms are poorly understood. In this study, a diet rich in ω-3 fatty acids alleviated AC symptoms in both early and late phases without affecting Th2 immune responses, but rather by altering the lipid mediator profiles. The ω-3 fatty acids completely suppressed scratching behavior toward the eyes, an allergic reaction provoked by itch. Although total serum IgE levels and the expression levels of Th2 cytokines and chemokines in the conjunctiva were not altered by ω-3 fatty acids, eosinophil infiltration into the conjunctiva was dramatically suppressed. The levels of ω-6–derived proinflammatory lipid mediators, including those with chemoattractant properties for eosinophils, were markedly reduced in the conjunctivae of ω-3 diet–fed mice. Dietary ω-3 fatty acids can alleviate a variety of symptoms of AC by altering the lipid mediator profile.—Hirakata, T., Lee, H.-C., Ohba, M., Saeki, K., Okuno, T., Murakami, A., Matsuda, A., Yokomizo, T. Dietary ω-3 fatty acids alter the lipid mediator profile and alleviate allergic conjunctivitis without modulating Th2 immune responses.
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Affiliation(s)
- Toshiaki Hirakata
- Department of Ophthalmology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hyeon-Cheol Lee
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Mai Ohba
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Akira Murakami
- Department of Ophthalmology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Akira Matsuda
- Department of Ophthalmology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, Tokyo, Japan
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30
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Sasaki F, Koga T, Ohba M, Saeki K, Okuno T, Ishikawa K, Nakama T, Nakao S, Yoshida S, Ishibashi T, Ahmadieh H, Kanavi MR, Hafezi-Moghadam A, Penninger JM, Sonoda KH, Yokomizo T. Leukotriene B4 promotes neovascularization and macrophage recruitment in murine wet-type AMD models. JCI Insight 2018; 3:96902. [PMID: 30232269 DOI: 10.1172/jci.insight.96902] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 08/07/2018] [Indexed: 12/18/2022] Open
Abstract
Age-related macular degeneration (AMD), a progressive chronic disease of the central retina, is associated with aging and is a leading cause of blindness worldwide. Here, we demonstrate that leukotriene B4 (LTB4) receptor 1 (BLT1) promotes laser-induced choroidal neovascularization (CNV) in a mouse model for wet-type AMD. CNV was significantly less in BLT1-deficient (BLT1-KO) mice compared with BLT1-WT controls. Expression of several proangiogenic and profibrotic factors was lower in BLT1-KO eyes than in BLT1-WT eyes. LTB4 production in the eyes was substantially increased in the early phase after laser injury. BLT1 was highly expressed in M2 macrophages in vitro and in vivo, and ocular BLT1+ M2 macrophages were increased in the aged eyes after laser injury. Furthermore, M2 macrophages were rapidly attracted by LTB4 and subsequently produced VEGF-A- through BLT1-mediated signaling. Consequently, intravitreal injection of M2 macrophages augmented CNV formation, which was attenuated by BLT1 deficiency. Thus, laser-induced injury to the retina triggered LTB4 production and attracted M2 macrophages via BLT1, leading to development of CNV. A selective BLT1 antagonist (CP105696) and 3 LTB4 inhibitors (zileuton, MK-886, and bestatin) reduced CNV in a dose-dependent manner. CP105696 also inhibited the accumulation of BLT1+ M2 macrophages in the laser-injured eyes of aged mice. Together, these results indicate that the LTB4-BLT1 axis is a potentially novel therapeutic target for CNV of wet-type AMD.
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Affiliation(s)
- Fumiyuki Sasaki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Tomoaki Koga
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Mai Ohba
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Keijiro Ishikawa
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Takahito Nakama
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shintaro Nakao
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shigeo Yoshida
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Tatsuro Ishibashi
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Hamid Ahmadieh
- Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mozhgan Rezaei Kanavi
- Ocular Tissue Engineering Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Hafezi-Moghadam
- Molecular Biomarkers Nano-Imaging Laboratory, Brigham & Women's Hospital, and Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA
| | - Josef M Penninger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna, Austria
| | - Koh-Hei Sonoda
- Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
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31
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Debeuf N, Lambrecht BN. Eicosanoid Control Over Antigen Presenting Cells in Asthma. Front Immunol 2018; 9:2006. [PMID: 30233591 PMCID: PMC6131302 DOI: 10.3389/fimmu.2018.02006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 08/14/2018] [Indexed: 12/11/2022] Open
Abstract
Asthma is a common lung disease affecting 300 million people worldwide. Allergic asthma is recognized as a prototypical Th2 disorder, orchestrated by an aberrant adaptive CD4+ T helper (Th2/Th17) cell immune response against airborne allergens, that leads to eosinophilic inflammation, reversible bronchoconstriction, and mucus overproduction. Other forms of asthma are controlled by an eosinophil-rich innate ILC2 response driven by epithelial damage, whereas in some patients with more neutrophilia, the disease is driven by Th17 cells. Dendritic cells (DCs) and macrophages are crucial regulators of type 2 immunity in asthma. Numerous lipid mediators including the eicosanoids prostaglandins and leukotrienes influence key functions of these cells, leading to either pro- or anti-inflammatory effects on disease outcome. In this review, we will discuss how eicosanoids affect the functions of DCs and macrophages in the asthmatic lung and how this leads to aberrant T cell differentiation that causes disease.
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Affiliation(s)
- Nincy Debeuf
- Laboratory of Immunoregulation, VIB-UGent Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine, Ghent University, Ghent, Belgium
| | - Bart N Lambrecht
- Laboratory of Immunoregulation, VIB-UGent Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine, Ghent University, Ghent, Belgium.,Department of Pulmonary Medicine, Erasmus Medical Center, Rotterdam, Netherlands
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32
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Sawada Y, Honda T, Nakamizo S, Otsuka A, Ogawa N, Kobayashi Y, Nakamura M, Kabashima K. Resolvin E1 attenuates murine psoriatic dermatitis. Sci Rep 2018; 8:11873. [PMID: 30089836 PMCID: PMC6082864 DOI: 10.1038/s41598-018-30373-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/25/2018] [Indexed: 12/13/2022] Open
Abstract
The potential of omega-3 poly-unsaturated fatty acids (PUFAs) as a therapeutic target for psoriasis, a chronic inflammatory skin disease of IL-23/IL-17 axis, is a long-disputed question, since various epidemiological studies have suggested the association between high-intake of omega-3 PUFAs and the reduced frequency and severity of psoriasis. However, their actual significance and the molecular mechanisms remain largely unknown. To address these issues, we focused on resolvin E1 (RvE1), an omega-3 PUFAs-derived metabolite, and examined its effects on psoriatic dermatitis, using an imiquimod-induced mouse psoriasis model. RvE1 potently suppressed the inflammatory cell infiltration and epidermal hyperplasia in the psoriatic skin. RvE1 decreased the mRNA expression of IL-23 in the skin. Consistently, RvE1 inhibited IL-23 production by dendritic cells (DCs) in vitro. Furthermore, RvE1 exerted inhibitory effects on migration of cutaneous DCs and γδ T cells, a major IL-17-producing cell population in mouse, both in vivo and in vitro. These suppressive effects of RvE1 were mediated by its antagonistic function on BLT1, a receptor of leukotriene B4, and were also observed in human DCs, Th17 and Tc17 cells. Our results indicate a novel mechanism of omega-3 PUFA-mediated amelioration of psoriasis, and suggest a potential of RvE1 as a therapeutic target for psoriasis.
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Affiliation(s)
- Yu Sawada
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Department of Dermatology, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Tetsuya Honda
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
| | - Satoshi Nakamizo
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Atsushi Otsuka
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Narihito Ogawa
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Tokyo, Japan
| | - Yuichi Kobayashi
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Tokyo, Japan
| | - Motonobu Nakamura
- Department of Dermatology, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Kenji Kabashima
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan. .,Singapore Immunology Network (SIgN) and Institute of Medical Biology, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore.
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33
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Saeki K, Yokomizo T. Identification, signaling, and functions of LTB 4 receptors. Semin Immunol 2018; 33:30-36. [PMID: 29042026 DOI: 10.1016/j.smim.2017.07.010] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 05/02/2017] [Accepted: 07/26/2017] [Indexed: 10/18/2022]
Abstract
Leukotriene B4 (LTB4), a lipid mediator produced from arachidonic acid, is a chemoattractant for inflammatory leukocytes. We identified two receptors for LTB4, the high-affinity receptor BLT1 and the low-affinity receptor BLT2. BLT1 is expressed in various subsets of leukocytes, and analyses of BLT1-deficient mice revealed that the LTB4/BLT1 axis enhances leukocyte recruitment to infected sites, and is involved in the elimination of pathogens. Hyperactivation of the LTB4/BLT1 axis induces acute and chronic inflammation, resulting in various inflammatory diseases. BLT2 was originally identified as a low-affinity receptor for LTB4, and we later identified 12(S)-hydroxy-5Z,8E,10E-heptadecatrienoic acid (12-HHT) as a high-affinity ligand for BLT2. BLT2 is highly expressed in epithelial cells in various tissues including intestine and skin. Large quantities of 12-HHT are produced by activated platelets during skin injury, and activation of BLT2 on epidermal keratinocytes accelerates skin wound healing by enhancing cell migration. BLT2 signaling also enhances cell-cell junctions, protectes against transepidermal water loss, and preventes entry of environmental substances into the body.
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Affiliation(s)
- Kazuko Saeki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan.
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34
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Gelfand EW. Importance of the leukotriene B4-BLT1 and LTB4-BLT2 pathways in asthma. Semin Immunol 2018; 33:44-51. [PMID: 29042028 DOI: 10.1016/j.smim.2017.08.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 06/26/2017] [Accepted: 08/06/2017] [Indexed: 12/01/2022]
Abstract
For several decades, the leukotriene pathways have been implicated as playing a central role in the pathophysiology of asthma. The presence and elevation of numerous metabolites in the blood, sputum, and bronchoalveolar lavage fluid from asthmatics or experimental animals adds support to this notion. However, targeting of the leukotriene pathways has had, in general, limited success. The single exception in asthma therapy has been targeting of the cysteinyl leukotriene receptor 1, which clinically has proven effective but only in certain clinical situations. Interference with 5-lipoxygenase has had limited success, in part due to adverse drug effects. The importance of the LTB4-BLT1 pathway in asthma pathogenesis has extensive experimental support and findings, albeit limited, from clinical samples. The LTB4-BLT1 pathway was shown to be important as a neutrophil chemoattractant. Despite observations made more than two decades ago, the LTB4-BLT1 pathway has only recently been shown to exhibit important activities on subsets of T lymphocytes, both as a chemoattractant and on lymphocyte activation, as well as on dendritic cells, the major antigen presenting cell in the lung. The role of BLT2 in asthma remains unclear. Targeting of components of the LTB4-BLT1 pathway offers innovative therapeutic opportunities especially in patients with asthma that remain uncontrolled despite intensive corticosteroid treatment.
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Affiliation(s)
- Erwin W Gelfand
- Division of Cell Biology, Department of Pediatrics, National Jewish Health, 1400 Jackson Street, Denver, CO 80206, United States.
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35
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Subramanian BC, Majumdar R, Parent CA. The role of the LTB 4-BLT1 axis in chemotactic gradient sensing and directed leukocyte migration. Semin Immunol 2018; 33:16-29. [PMID: 29042024 DOI: 10.1016/j.smim.2017.07.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 06/07/2017] [Accepted: 07/13/2017] [Indexed: 12/11/2022]
Abstract
Directed leukocyte migration is a hallmark of inflammatory immune responses. Leukotrienes are derived from arachidonic acid and represent a class of potent lipid mediators of leukocyte migration. In this review, we summarize the essential steps leading to the production of LTB4 in leukocytes. We discuss the recent findings on the exosomal packaging and transport of LTB4 in the context of chemotactic gradients formation and regulation of leukocyte recruitment. We also discuss the dynamic roles of the LTB4 receptors, BLT1 and BLT2, in mediating chemotactic signaling in leukocytes and contrast them to other structurally related leukotrienes that bind to distinct GPCRs. Finally, we highlight the specific roles of the LTB4-BLT1 axis in mediating signal-relay between chemotaxing neutrophils and its potential contribution to a wide variety of inflammatory conditions including tumor progression and metastasis, where LTB4 is emerging as a key signaling component.
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Affiliation(s)
- Bhagawat C Subramanian
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, NIH, Bethesda, MD 20892, United States.
| | - Ritankar Majumdar
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, NIH, Bethesda, MD 20892, United States; Department of Pharmacology, University of Michigan School of Medicine, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, United States.
| | - Carole A Parent
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, NIH, Bethesda, MD 20892, United States; Department of Pharmacology, University of Michigan School of Medicine, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, United States.
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36
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Yokomizo T, Nakamura M, Shimizu T. Leukotriene receptors as potential therapeutic targets. J Clin Invest 2018; 128:2691-2701. [PMID: 29757196 DOI: 10.1172/jci97946] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Leukotrienes, a class of arachidonic acid-derived bioactive molecules, are known as mediators of allergic and inflammatory reactions and considered to be important drug targets. Although an inhibitor of leukotriene biosynthesis and antagonists of the cysteinyl leukotriene receptor are clinically used for bronchial asthma and allergic rhinitis, these medications were developed before the molecular identification of leukotriene receptors. Numerous studies using cloned leukotriene receptors and genetically engineered mice have unveiled new pathophysiological roles for leukotrienes. This Review covers the recent findings on leukotriene receptors to revisit them as new drug targets.
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Affiliation(s)
- Takehiko Yokomizo
- Department of Biochemistry, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Motonao Nakamura
- Department of Life Science, Graduate School of Science, Okayama University of Science, Okayama, Japan
| | - Takao Shimizu
- Department of Lipidomics, Faculty of Medicine, University of Tokyo, Tokyo, Japan.,Department of Lipid Signaling, National Center for Global Health and Medicine, Tokyo, Japan
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37
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Abstract
The high affinity leukotriene B4 receptor, BLT1 mediates chemotaxis of diverse leukocyte subsets to the sites of infection or inflammation. Whereas the pathological functions of LTB4/BLT1 axis in allergy, autoimmunity and cardiovascular disorders are well established; its role in cancer is only beginning to emerge. In this review, we summarize recent findings on LTB4/BLT1 axis enabling distinct outcomes toward tumor progression. In a mouse lung tumor model promoted by silicosis-induced inflammation, genetic deletion of BLT1 attenuated neutrophilic inflammation and tumor promotion. In contrast, in a spontaneous model of intestinal tumorigenesis, absence of BLT1 led to defective mucosal host response, altered microbiota and bacteria dependent colon tumor progression. Furthermore, BLT1 mediated CD8+ T cell recruitment was shown to be essential for initiating anti-tumor immunity in number of xenograft models and is critical for effective PD1 based immunotherapy. BLT2 mediated chemotherapy resistance, tumor promotion and metastasis are also discussed. This new information points to a paradigm shift in our understanding of the LTB4 pathways in cancer.
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38
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Wan M, Tang X, Stsiapanava A, Haeggström JZ. Biosynthesis of leukotriene B 4. Semin Immunol 2017; 33:3-15. [DOI: 10.1016/j.smim.2017.07.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 05/29/2017] [Accepted: 07/31/2017] [Indexed: 12/31/2022]
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Sasaki F, Koga T, Saeki K, Okuno T, Kazuno S, Fujimura T, Ohkawa Y, Yokomizo T. Biochemical and immunological characterization of a novel monoclonal antibody against mouse leukotriene B4 receptor 1. PLoS One 2017; 12:e0185133. [PMID: 28922396 PMCID: PMC5602668 DOI: 10.1371/journal.pone.0185133] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 09/05/2017] [Indexed: 01/27/2023] Open
Abstract
Leukotriene B4 (LTB4) receptor 1 (BLT1) is a G protein-coupled receptor expressed in various leukocyte subsets; however, the precise expression of mouse BLT1 (mBLT1) has not been reported because a mBLT1 monoclonal antibody (mAb) has not been available. In this study, we present the successful establishment of a hybridoma cell line (clone 7A8) that produces a high-affinity mAb for mBLT1 by direct immunization of BLT1-deficient mice with mBLT1-overexpressing cells. The specificity of clone 7A8 was confirmed using mBLT1-overexpressing cells and mouse peripheral blood leukocytes that endogenously express BLT1. Clone 7A8 did not cross-react with human BLT1 or other G protein-coupled receptors, including human chemokine (C-X-C motif) receptor 4. The 7A8 mAb binds to the second extracellular loop of mBLT1 and did not affect LTB4 binding or intracellular calcium mobilization by LTB4. The 7A8 mAb positively stained Gr-1-positive granulocytes, CD11b-positive granulocytes/monocytes, F4/80-positive monocytes, CCR2-high and CCR2-low monocyte subsets in the peripheral blood and a CD4-positive T cell subset, Th1 cells differentiated in vitro from naïve CD4-positive T cells. This mAb was able to detect Gr-1-positive granulocytes and monocytes in the spleens of naïve mice by immunohistochemistry. Finally, intraperitoneal administration of 7A8 mAb depleted granulocytes and monocytes in the peripheral blood. We have therefore succeeded in generating a high-affinity anti-mBLT1 mAb that is useful for analyzing mBLT1 expression in vitro and in vivo.
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MESH Headings
- Animals
- Antibodies, Monoclonal, Murine-Derived/chemistry
- Antibodies, Monoclonal, Murine-Derived/immunology
- Antibodies, Monoclonal, Murine-Derived/pharmacology
- CHO Cells
- Calcium Signaling/drug effects
- Cell Differentiation/immunology
- Cricetinae
- Cricetulus
- Granulocytes/immunology
- Leukotriene B4/immunology
- Male
- Mice
- Mice, Inbred BALB C
- Mice, Knockout
- Monocytes/immunology
- Protein Structure, Secondary
- Receptors, Leukotriene B4/antagonists & inhibitors
- Receptors, Leukotriene B4/chemistry
- Receptors, Leukotriene B4/immunology
- Th1 Cells/immunology
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Affiliation(s)
- Fumiyuki Sasaki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Tomoaki Koga
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Saiko Kazuno
- Laboratory of Proteomics and Biomolecular Science Research Support Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Tsutomu Fujimura
- Laboratory of Bioanalytical Chemistry, Tohoku Medical and Pharmaceutical University, Miyagi, Japan
| | - Yasuyuki Ohkawa
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
- * E-mail:
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40
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Takeda T, Komiya Y, Koga T, Ishida T, Ishii Y, Kikuta Y, Nakaya M, Kurose H, Yokomizo T, Shimizu T, Uchi H, Furue M, Yamada H. Dioxin-induced increase in leukotriene B4 biosynthesis through the aryl hydrocarbon receptor and its relevance to hepatotoxicity owing to neutrophil infiltration. J Biol Chem 2017; 292:10586-10599. [PMID: 28487374 DOI: 10.1074/jbc.m116.764332] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 05/02/2017] [Indexed: 12/20/2022] Open
Abstract
Dioxin and related chemicals alter the expression of a number of genes by activating the aryl hydrocarbon receptors (AHR) to produce a variety of disorders including hepatotoxicity. However, it remains largely unknown how these changes in gene expression are linked to toxicity. To address this issue, we initially examined the effect of 2,3,7,8-tetrachrolodibenzo-p-dioxin (TCDD), a most toxic dioxin, on the hepatic and serum metabolome in male pubertal rats and found that TCDD causes many changes in the level of fatty acids, bile acids, amino acids, and their metabolites. Among these findings was the discovery that TCDD increases the content of leukotriene B4 (LTB4), an inducer of inflammation due to the activation of leukocytes, in the liver of rats and mice. Further analyses suggested that an increase in LTB4 comes from a dual mechanism consisting of an induction of arachidonate lipoxygenase-5, a rate-limiting enzyme in LTB4 synthesis, and the down-regulation of LTC4 synthase, an enzyme that converts LTA4 to LTC4. The above changes required AHR activation, because the same was not observed in AHR knock-out rats. In agreement with LTB4 accumulation, TCDD caused the marked infiltration of neutrophils into the liver. However, deleting LTB4 receptors (BLT1) blocked this effect. A TCDD-produced increase in the mRNA expression of inflammatory markers, including tumor-necrosis factor and hepatic damage, was also suppressed in BLT1-null mice. The above observations focusing on metabolomic changes provide novel evidence that TCDD accumulates LTB4 in the liver by an AHR-dependent induction of LTB4 biosynthesis to cause hepatotoxicity through neutrophil activation.
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Affiliation(s)
| | | | | | | | - Yuji Ishii
- From the Laboratory of Molecular Life Sciences and
| | - Yasushi Kikuta
- the Department of Applied Biological Science, Fukuyama University, Hiroshima 729-0292, Japan
| | - Michio Nakaya
- the Laboratory of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hitoshi Kurose
- the Laboratory of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takehiko Yokomizo
- the Department of Biochemistry, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Takao Shimizu
- the Department of Lipid Signaling, Research Institute National Center for Global Health and Medicine, Tokyo 162-8655, Japan.,the Department of Lipidomics, Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan, and
| | - Hiroshi Uchi
- the Department of Dermatology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Masutaka Furue
- the Department of Dermatology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.,the Research and Clinical Center for Yusho and Dioxin, Kyushu University Hospital, Fukuoka 812-8582, Japan
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41
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Hijioka M, Anan J, Ishibashi H, Kurauchi Y, Hisatsune A, Seki T, Koga T, Yokomizo T, Shimizu T, Katsuki H. Inhibition of Leukotriene B4 Action Mitigates Intracerebral Hemorrhage-Associated Pathological Events in Mice. J Pharmacol Exp Ther 2016; 360:399-408. [DOI: 10.1124/jpet.116.238824] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 12/28/2016] [Indexed: 01/30/2023] Open
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42
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von Moltke J, O'Leary CE, Barrett NA, Kanaoka Y, Austen KF, Locksley RM. Leukotrienes provide an NFAT-dependent signal that synergizes with IL-33 to activate ILC2s. J Exp Med 2016; 214:27-37. [PMID: 28011865 PMCID: PMC5206504 DOI: 10.1084/jem.20161274] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 11/02/2016] [Accepted: 11/25/2016] [Indexed: 12/20/2022] Open
Abstract
von Moltke et al. demonstrate that optimal cytokine induction in group 2 innate lymphocytes results from synergy between NFAT-dependent leukotriene signaling and IL-33 signaling. This integration of signaling pathways may represent an innate substitute for the T cell receptor. Group 2 innate lymphoid cells (ILC2s) and type 2 helper T cells (Th2 cells) are the primary source of interleukin 5 (IL-5) and IL-13 during type 2 (allergic) inflammation in the lung. In Th2 cells, T cell receptor (TCR) signaling activates the transcription factors nuclear factor of activated T cells (NFAT), nuclear factor κB (NF-κB), and activator protein 1 (AP-1) to induce type 2 cytokines. ILC2s lack a TCR and respond instead to locally produced cytokines such as IL-33. Although IL-33 induces AP-1 and NF-κB, NFAT signaling has not been described in ILC2s. In this study, we report a nonredundant NFAT-dependent role for lipid-derived leukotrienes (LTs) in the activation of lung ILC2s. Using cytokine reporter and LT-deficient mice, we find that complete disruption of LT signaling markedly diminishes ILC2 activation and downstream responses during type 2 inflammation. Type 2 responses are equivalently attenuated in IL-33– and LT-deficient mice, and optimal ILC2 activation reflects potent synergy between these pathways. These findings expand our understanding of ILC2 regulation and may have important implications for the treatment of airways disease.
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Affiliation(s)
- Jakob von Moltke
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143 .,Department of Medicine, University of California, San Francisco, San Francisco, CA 94143.,Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143
| | - Claire E O'Leary
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143.,Department of Medicine, University of California, San Francisco, San Francisco, CA 94143.,Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143
| | - Nora A Barrett
- Department of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Boston, MA 02115
| | - Yoshihide Kanaoka
- Department of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Boston, MA 02115
| | - K Frank Austen
- Department of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Boston, MA 02115
| | - Richard M Locksley
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143 .,Department of Medicine, University of California, San Francisco, San Francisco, CA 94143.,Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143
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43
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Leguina-Ruzzi A, Valderas JP. BLT2 expression improves skin integrity and protects from alterations caused by hyperglycemia in type 2 diabetes. DERMATO-ENDOCRINOLOGY 2016; 9:e1267078. [PMID: 28405264 PMCID: PMC5386100 DOI: 10.1080/19381980.2016.1267078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 11/28/2016] [Indexed: 12/14/2022]
Abstract
Type 2 diabetes (T2D) can go undiagnosed for years, leading to a stage where chronic high blood sugar produces complications such as delayed wound healing. Reports have shown that BLT2 activation improves keratinocyte migration and wound healing, as well as protecting the epidermal barrier through the promotion of actin polymerization. The goal of this study was to elucidate the role of BLT2 expression in skin epithelial integrity in T2D. For this purpose, we used both wild type (WT) and BLT2 knockout mice in a model, in which a T2D-like phenotype was induced by keeping the animals on a high fat (HF) diet over 5 weeks. In a parallel in vitro approach, we cultured BLT2-transfected HaCaT cells at both low and high glucose concentrations for 48 h. Structure, transepithelial resistance (TEER), IL-1ß, IL-8 or CXCL2, MMP9, Filaggrin, Loricrin and Keratin 10 (K10) were evaluated ex vivo and in vitro. Additionally, wound healing (WH) was studied in vitro. The skin from T2D and BLT2 knockout mice showed a reduction in TEER and the expression of IL-1ß, and in increase in CXCL2, MMP9, Filaggrin, Loricrin and K10 expression. The structure suggested an atrophic epidermis; however, the skin was dramatically affected in the BLT2 knockout mice kept on a HF diet. HaCaT-BLT2 cells presented as an organized monolayer and showed higher TEER and wound healing compared with vector only-transfected HaCaT-Mock cells. Likewise, alterations in the expression of skin inflammatory, matrix degradation and differentiation markers under low and high glucose conditions were less severe than in HaCaT-Mock cells. Our results suggest that BLT2 improves epithelial integrity and function by regulating differentiation markers, cytokines and MMP9. Furthermore, BLT2 attenuates the damaging effects of high glucose levels, thereby accelerating wound healing.
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Affiliation(s)
| | - Juan P Valderas
- Departamento de Ciencias Médicas, Facultad de Medicina Odontología, Universidad de Antofagasta , Antofagasta, Chile
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44
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Ichiki T, Koga T, Yokomizo T. Receptor for Advanced Glycation End Products Regulates Leukotriene B 4 Receptor 1 Signaling. DNA Cell Biol 2016; 35:747-750. [PMID: 27830944 DOI: 10.1089/dna.2016.3552] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Leukotriene B4 receptor 1 (BLT1), a high-affinity G protein-coupled receptor (GPCR) for leukotriene B4 (LTB4), plays important roles in inflammatory and immune reactions. Although the LTB4-BLT1 axis is known to promote inflammation, the binding proteins that modulate LTB4-BLT1 signaling have not been identified. Recently, we discovered that receptor for advanced glycation end products (RAGE) interacts with BLT1 and modulates LTB4-BLT1 signaling. We propose RAGE as a new class of GPCR modulator and a new target of future GPCR studies.
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Affiliation(s)
- Takako Ichiki
- 1 Department of Biochemistry, Juntendo University School of Medicine , Tokyo, Japan
| | - Tomoaki Koga
- 1 Department of Biochemistry, Juntendo University School of Medicine , Tokyo, Japan .,2 Priority Organization for Innovation and Excellence, Program for Leading Graduate Schools, "Health Life Science: Interdisciplinary and Glocal Oriented (HIGO) Program," Kumamoto University , Kumamoto, Japan
| | - Takehiko Yokomizo
- 1 Department of Biochemistry, Juntendo University School of Medicine , Tokyo, Japan
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45
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Shigematsu M, Koga T, Ishimori A, Saeki K, Ishii Y, Taketomi Y, Ohba M, Jo-Watanabe A, Okuno T, Harada N, Harayama T, Shindou H, Li JD, Murakami M, Hoka S, Yokomizo T. Leukotriene B 4 receptor type 2 protects against pneumolysin-dependent acute lung injury. Sci Rep 2016; 6:34560. [PMID: 27703200 PMCID: PMC5050523 DOI: 10.1038/srep34560] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 09/15/2016] [Indexed: 01/23/2023] Open
Abstract
Although pneumococcal infection is a serious problem worldwide and has a high mortality rate, the molecular mechanisms underlying the lethality caused by pneumococcus remain elusive. Here, we show that BLT2, a G protein-coupled receptor for leukotriene B4 and 12(S)-hydroxyheptadecatrienoic acid (12-HHT), protects mice from lung injury caused by a pneumococcal toxin, pneumolysin (PLY). Intratracheal injection of PLY caused lethal acute lung injury (ALI) in BLT2-deficient mice, with evident vascular leakage and bronchoconstriction. Large amounts of cysteinyl leukotrienes (cysLTs), classically known as a slow reactive substance of anaphylaxis, were detected in PLY-treated lungs. PLY-dependent vascular leakage, bronchoconstriction, and death were markedly ameliorated by treatment with a CysLT1 receptor antagonist. Upon stimulation by PLY, mast cells produced cysLTs that activated CysLT1 expressed in vascular endothelial cells and bronchial smooth muscle cells, leading to lethal vascular leakage and bronchoconstriction. Treatment of mice with aspirin or loxoprofen inhibited the production of 12-HHT and increased the sensitivity toward PLY, which was also ameliorated by the CysLT1 antagonist. Thus, the present study identifies the molecular mechanism underlying PLY-dependent ALI and suggests the possible use of CysLT1 antagonists as a therapeutic tool to protect against ALI caused by pneumococcal infection.
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Affiliation(s)
- Misako Shigematsu
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan.,Department of Anesthesiology and Critical Care Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Tomoaki Koga
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Ayako Ishimori
- Department of Respiratory Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Kazuko Saeki
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Yumiko Ishii
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Yoshitaka Taketomi
- Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Mai Ohba
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Airi Jo-Watanabe
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Toshiaki Okuno
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
| | - Norihiro Harada
- Department of Respiratory Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Takeshi Harayama
- Lipid Signaling Project, National Center for Global Health and Medicine, Tokyo, Japan.,Department of Biochemistry, University of Geneva, Geneva, Switzerland
| | - Hideo Shindou
- Lipid Signaling Project, National Center for Global Health and Medicine, Tokyo, Japan
| | - Jian-Dong Li
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, GA, USA
| | - Makoto Murakami
- Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Sumio Hoka
- Department of Anesthesiology and Critical Care Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan
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46
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Hall JA, Hartman J, Skinner MM, Schwindt AR, Fischer KA, Vorachek WR, Bobe G, Valentine BA. Dietary Enrichment with 20% Fish Oil Decreases Mucus Production and the Inflammatory Response in Mice with Ovalbumin-Induced Allergic Lung Inflammation. PLoS One 2016; 11:e0163819. [PMID: 27669173 PMCID: PMC5036796 DOI: 10.1371/journal.pone.0163819] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 09/14/2016] [Indexed: 11/18/2022] Open
Abstract
The prevalence of asthma has increased in recent decades, which may be related to higher dietary intake of (n-6) polyunsaturated fatty acids (PUFA) and lower intake of (n-3) PUFA, e.g., those contained in fish oil. The objective of this study was to determine if dietary PUFA enrichment decreases mucus production or the inflammatory response associated with ovalbumin (OVA)-induced allergic lung inflammation. Mice (n = 10/group) were fed control, 20% fish oil, or 20% corn oil enriched diets for a total of 12 weeks. At 8 and 10 weeks, mice were given an intraperitoneal injection of saline (10 control-fed mice) or OVA (30 remaining mice). Once at 10 weeks and on 3 consecutive days during week 12, mice were challenged by nebulizing with saline or OVA. Mice were euthanized 24 hours after the last challenge and blood was collected for plasma FA analysis. Bronchoalveolar lavage (BAL) fluid was collected to determine cell composition and Th2-type cytokine (IL-4, IL-13) concentrations. Periodic acid-Schiff (PAS) + mucus-producing cells and CD45+ inflammatory cell infiltrates in lung tissue were quantified using morphometric analysis. Relative abundance of mRNA for mucin (Muc4, Muc5ac, and Muc5b) and Th2-type cytokine (IL-4, IL-5, and IL-13) genes were compared with ß-actin by qPCR. Supplementation with either corn oil or fish oil effectively altered plasma FA profiles towards more (n-6) FA or (n-3) FA, respectively (P < 0.0001). Sensitization and challenge with OVA increased the proportion of neutrophils, lymphocytes, and eosinophils, and decreased the proportion of macrophages and concentrations of IL-13 in BAL fluid; increased the percentage of PAS+ mucus-producing cells and CD45+ inflammatory cell infiltrates in lung tissue; and increased gene expression of mucins (Muc4, Muc5ac, and Muc5b) and Th2-type cytokines (IL-5 and IL-13) in lung tissue of control-fed mice. Dietary PUFA reversed the increase in PAS+ mucus-producing cells (P = 0.003). In addition, dietary enrichment with fish oil attenuated the percentage of CD45+ inflammatory cell infiltrates in lung tissue, and increased Muc4 and Muc 5b gene expression compared with OVA-sensitized and challenged control mice. In conclusion, dietary enrichment with either (n-3) or (n-6) PUFA decreased mucus production in lung tissues of OVA-sensitized and challenged mice. More specifically, enrichment with dietary (n-3) PUFA decreased CD45+ inflammatory cell infiltrates, thus inducing potentially beneficial changes in lung tissue of OVA-sensitized and challenged mice.
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Affiliation(s)
- Jean A. Hall
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
- * E-mail:
| | - Jaye Hartman
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
| | - Monica M. Skinner
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
| | - Adam R. Schwindt
- Department of Microbiology, College of Science and College of Agricultural Sciences, Oregon State University, Corvallis, OR, United States of America
| | - Kay A. Fischer
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
| | - William R. Vorachek
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
| | - Gerd Bobe
- Department of Animal and Rangeland Sciences, College of Agricultural Sciences, Oregon State University, Corvallis, OR, United States of America
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States of America
| | - Beth A. Valentine
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States of America
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47
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Wang Z, Zhang H, Sun X, Ren L. The protective role of vitamin D3 in a murine model of asthma via the suppression of TGF-β/Smad signaling and activation of the Nrf2/HO-1 pathway. Mol Med Rep 2016; 14:2389-96. [PMID: 27484042 PMCID: PMC4991747 DOI: 10.3892/mmr.2016.5563] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 05/13/2016] [Indexed: 12/13/2022] Open
Abstract
Asthma is a common worldwide health burden, the prevalence of which is increasing. Recently, the biologically active form of vitamin D3, 1,25-dihydroxyvitamin D3, has been reported to have a protective role in murine asthma; however, the molecular mechanisms by which vitamin D3 attenuates asthma-associated airway injury remain elusive. In the present study, BALB/c mice were sensitized to ovalbumin (OVA) and were administered 100 ng 1,25-dihydroxyvitamin D3 (intraperitoneal injection) 30 min prior to each airway challenge. The inflammatory responses were measured by ELISA, airway damage was analyzed by hematoxylin and eosin staining, airway remodeling was analyzed by Masson staining and periodic acid-Schiff staining, markers of oxidative stress were measured by commercial kits, and the expression levels of α-smooth muscle actin (α-SMA) and the activity of the NF-E2-related factor 2 (Nrf2)/heme oxygenase-1 (HO-1) and the transforming growth factor-β (TGF-β)/Smad signaling pathways were measured by immunohistochemistry and western blotting. The results demonstrated that OVA-induced airway inflammation and immunoglobulin E overexpression were significantly reduced by vitamin D3 treatment. In addition, treatment with vitamin D3 decreased α-SMA expression, collagen deposition and goblet cell hyperplasia, and inhibited TGF-β/Smad signaling in the asthmatic airway. The upregulated levels of malondialdehyde, and the reduced activities of superoxide dismutase and glutathione in OVA-challenged mice were also markedly restored following vitamin D3 treatment. Furthermore, treatment with vitamin D3 enhanced activation of the Nrf2/HO-1 pathway in the airways of asthmatic mice. In conclusion, these findings suggest that vitamin D3 may protect airways from asthmatic damage via the suppression of TGF-β/Smad signaling and activation of the Nrf2/HO-1 pathway; however, these protective effects were shown to be accompanied by hypercalcemia.
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Affiliation(s)
- Zhihui Wang
- Department of Pediatric Internal Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Haitao Zhang
- Department of Pediatric Internal Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Xiaohan Sun
- Department of Pediatric Internal Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Lihong Ren
- Department of Pediatric Internal Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
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48
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BLT1 signalling protects the liver against acetaminophen hepatotoxicity by preventing excessive accumulation of hepatic neutrophils. Sci Rep 2016; 6:29650. [PMID: 27404729 PMCID: PMC4939602 DOI: 10.1038/srep29650] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 05/23/2016] [Indexed: 12/11/2022] Open
Abstract
Leukotriene B4 (LTB4) is a potent chemoattractant for neutrophils. Signalling of LTB4 receptor type 1 (BLT1) has pro-inflammatory functions through neutrophil recruitment. In this study, we investigated whether BLT1 signalling plays a role in acetaminophen (APAP)-induced liver injury by affecting inflammatory responses including the accumulation of hepatic neutrophils. BLT1-knockout (BLT1−/−) mice and their wild-type (WT) counterparts were subjected to a single APAP overdose (300 mg/kg), and various parameters compared within 24 h after treatment. Compared with WT mice, BLT1−/− mice exhibited exacerbation of APAP-induced liver injury as evidenced by enhancement of alanine aminotransferase level, necrotic area, hepatic neutrophil accumulation, and expression of cytokines and chemokines. WT mice co-treated with APAP and ONO-0457, a specific antagonist for BLT1, displayed amplification of the injury, and similar results to those observed in BLT1−/− mice. Hepatic neutrophils in BLT1−/− mice during APAP hepatotoxicity showed increases in the production of reactive oxygen species and matrix metalloproteinase-9. Administration of isolated BLT1-deficient neutrophils into WT mice aggravated the liver injury elicited by APAP. These results demonstrate that BLT1 signalling dampens the progression of APAP hepatotoxicity through inhibiting an excessive accumulation of activated neutrophils. The development of a specific agonist for BLT1 could be useful for the prevention of APAP hepatotoxicity.
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49
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Ichiki T, Koga T, Okuno T, Saeki K, Yamamoto Y, Yamamoto H, Sakaguchi M, Yokomizo T. Modulation of leukotriene B
4
receptor 1 signaling by receptor for advanced glycation end products (RAGE). FASEB J 2016; 30:1811-22. [DOI: 10.1096/fj.201500117] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 01/07/2016] [Indexed: 12/20/2022]
Affiliation(s)
- Takako Ichiki
- Department of BiochemistryJuntendo University School of MedicineTokyoJapan
| | - Tomoaki Koga
- Department of BiochemistryJuntendo University School of MedicineTokyoJapan
| | - Toshiaki Okuno
- Department of BiochemistryJuntendo University School of MedicineTokyoJapan
| | - Kazuko Saeki
- Department of BiochemistryJuntendo University School of MedicineTokyoJapan
| | - Yasuhiko Yamamoto
- Department of Biochemistry and Molecular Vascular BiologyKanazawa University Graduate School of Medical SciencesKanazawaJapan
| | - Hiroshi Yamamoto
- Department of Biochemistry and Molecular Vascular BiologyKanazawa University Graduate School of Medical SciencesKanazawaJapan
| | - Masakiyo Sakaguchi
- Department of Cell BiologyOkayama University Graduate School of Medicine, Dentistry, and Pharmaceutical SciencesOkayamaJapan
| | - Takehiko Yokomizo
- Department of BiochemistryJuntendo University School of MedicineTokyoJapan
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50
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Differential Contribution of BLT1 and BLT2 to Leukotriene B4-Induced Human NK Cell Cytotoxicity and Migration. Mediators Inflamm 2015; 2015:389849. [PMID: 26696753 PMCID: PMC4678237 DOI: 10.1155/2015/389849] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 11/03/2015] [Indexed: 12/16/2022] Open
Abstract
Accumulating evidence indicates that leukotriene B4 (LTB4) via its receptors BLT1 and/or BLT2 (BLTRs) could have an important role in regulating infection, tumour progression, inflammation, and autoimmune diseases. In the present study, we showed that LTB4 not only augments cytotoxicity by NK cells but also induces their migration. We found that approximately 30% of fresh NK cells express BLT1, 36% express BLT2, and 15% coexpress both receptors. The use of selective BLTR antagonists indicated that BLT1 was involved in both LTB4-induced migration and cytotoxicity, whereas BLT2 was involved exclusively in NK cell migration, but only in response to higher concentrations of LTB4. BLT1 and BLT2 expression increased after activation of NK cells with IL-2 and IL-15. These changes of BLTR expression by cytokines were reflected in enhanced NK cell responses to LTB4. Our findings suggest that BLT1 and BLT2 play differential roles in LTB4-induced modulation of NK cell activity.
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