1
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Kahnt AS, Häfner AK, Steinhilber D. The role of human 5-Lipoxygenase (5-LO) in carcinogenesis - a question of canonical and non-canonical functions. Oncogene 2024; 43:1319-1327. [PMID: 38575760 PMCID: PMC11065698 DOI: 10.1038/s41388-024-03016-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 03/21/2024] [Accepted: 03/21/2024] [Indexed: 04/06/2024]
Abstract
5-Lipoxygenase (5-LO), a fatty acid oxygenase, is the central enzyme in leukotriene (LT) biosynthesis, potent arachidonic acid-derived lipid mediators released by innate immune cells, that control inflammatory and allergic responses. In addition, through interaction with 12- and 15-lipoxgenases, the enzyme is involved in the formation of omega-3 fatty acid-based oxylipins, which are thought to be involved in the resolution of inflammation. The expression of 5-LO is frequently deregulated in solid and liquid tumors, and there is strong evidence that the enzyme plays an important role in carcinogenesis. However, global inhibition of LT formation and signaling has not yet shown the desired success in clinical trials. Curiously, the release of 5-LO-derived lipid mediators from tumor cells is often low, and the exact mechanism by which 5-LO influences tumor cell function is poorly understood. Recent data now show that in addition to releasing oxylipins, 5-LO can also influence gene expression in a lipid mediator-independent manner. These non-canonical functions, including modulation of miRNA processing and transcription factor shuttling, most likely influence cancer cell function and the tumor microenvironment and might explain the low clinical efficacy of pharmacological strategies that previously only targeted oxylipin formation and signaling by 5-LO. This review summarizes the canonical and non-canonical functions of 5-LO with a particular focus on tumorigenesis, highlights unresolved issues, and suggests future research directions.
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Affiliation(s)
- Astrid S Kahnt
- Institute of Pharmaceutical Chemistry, Goethe University, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany.
| | - Ann-Kathrin Häfner
- Institute of Pharmaceutical Chemistry, Goethe University, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
| | - Dieter Steinhilber
- Institute of Pharmaceutical Chemistry, Goethe University, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
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2
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Chen M, Wang L, Li M, Budai MM, Wang J. Mitochondrion-Mediated Cell Death through Erk1-Alox5 Independent of Caspase-9 Signaling. Cells 2022; 11:cells11193053. [PMID: 36231015 PMCID: PMC9564198 DOI: 10.3390/cells11193053] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/22/2022] [Accepted: 09/25/2022] [Indexed: 02/02/2023] Open
Abstract
Mitochondrial disruption leads to the release of cytochrome c to activate caspase-9 and the downstream caspase cascade for the execution of apoptosis. However, cell death can proceed efficiently in the absence of caspase-9 following mitochondrial disruption, suggesting the existence of caspase-9-independent cell death mechanisms. Through a genome-wide siRNA library screening, we identified a network of genes that mediate caspase-9-independent cell death, through ROS production and Alox5-dependent membrane lipid peroxidation. Erk1-dependent phosphorylation of Alox5 is critical for targeting Alox5 to the nuclear membrane to mediate lipid peroxidation, resulting in nuclear translocation of cytolytic molecules to induce DNA damage and cell death. Consistently, double knockouts of caspase-9 and Alox5 in mice, but not deletion of either gene alone, led to significant T cell expansion with inhibited cell death, indicating that caspase-9- and Alox5-dependent pathways function in parallel to regulate T cell death in vivo. This unbiased whole-genome screening reveals an Erk1-Alox5-mediated pathway that promotes membrane lipid peroxidation and nuclear translocation of cytolytic molecules, leading to the execution of cell death in parallel to the caspase-9 signaling cascade.
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Affiliation(s)
- Min Chen
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Correspondence: (M.C.); (J.W.)
| | - Lei Wang
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Min Li
- Immunobiology and Transplant Science Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Marietta M. Budai
- Immunobiology and Transplant Science Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Jin Wang
- Immunobiology and Transplant Science Center, Houston Methodist Research Institute, Houston, TX 77030, USA
- Department of Surgery, Weill Cornell Medical College, Cornell University, New York, NY 10065, USA
- Correspondence: (M.C.); (J.W.)
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3
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Saado I, Chia KS, Betz R, Alcântara A, Pettkó-Szandtner A, Navarrete F, D'Auria JC, Kolomiets MV, Melzer M, Feussner I, Djamei A. Effector-mediated relocalization of a maize lipoxygenase protein triggers susceptibility to Ustilago maydis. THE PLANT CELL 2022; 34:2785-2805. [PMID: 35512341 PMCID: PMC9252493 DOI: 10.1093/plcell/koac105] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 02/17/2022] [Indexed: 05/07/2023]
Abstract
As the gall-inducing smut fungus Ustilago maydis colonizes maize (Zea mays) plants, it secretes a complex effector blend that suppresses host defense responses, including production of reactive oxygen species (ROS) and redirects host metabolism to facilitate colonization. We show that the U. maydis effector ROS burst interfering protein 1 (Rip1), which is involved in pathogen-associated molecular pattern (PAMP)-triggered suppression of host immunity, is functionally conserved in several other monocot-infecting smut fungi. We also have identified a conserved C-terminal motif essential for Rip1-mediated PAMP-triggered suppression of the ROS burst. The maize susceptibility factor lipoxygenase 3 (Zmlox3) bound by Rip1 was relocalized to the nucleus, leading to partial suppression of the ROS burst. Relocalization was independent of its enzymatic activity, revealing a distinct function for ZmLox3. Most importantly, whereas Zmlox3 maize mutant plants showed increased resistance to U. maydis wild-type strains, rip1 deletion strains infecting the Zmlox3 mutant overcame this effect. This could indicate that Rip1-triggered host resistance depends on ZmLox3 to be suppressed and that lox3 mutation-based resistance of maize to U. maydis requires functional Rip1. Together, our results reveal that Rip1 acts in several cellular compartments to suppress immunity and that targeting of ZmLox3 by Rip1 is responsible for the suppression of Rip1-dependent reduced susceptibility of maize to U. maydis.
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Affiliation(s)
- Indira Saado
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
| | - Khong-Sam Chia
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
| | - Ruben Betz
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
| | - André Alcântara
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
| | | | - Fernando Navarrete
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
| | - John C D'Auria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
| | | | - Michael Melzer
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
| | - Ivo Feussner
- Department of Plant Biochemistry, University of Göttingen, Albrecht-von-Haller Institute for Plant Sciences and Goettingen Center for Molecular Biosciences (GZMB), Göttingen 37077, Germany
| | - Armin Djamei
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences (OEAW), Vienna BioCenter 7(VBC),Vienna 1030, Austria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland D-06466, Germany
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4
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Liu M, Yan M, He J, Lv H, Chen Z, Peng L, Cai W, Yao F, Chen C, Shi L, Zhang K, Zhang X, Wang DW, Wang L, Zhu Y, Ai D. Macrophage MST1/2 Disruption Impairs Post-Infarction Cardiac Repair via LTB4. Circ Res 2021; 129:909-926. [PMID: 34515499 DOI: 10.1161/circresaha.121.319687] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
[Figure: see text].
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MESH Headings
- Animals
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/genetics
- Antigens, Differentiation, Myelomonocytic/metabolism
- Chemokine CCL2/genetics
- Chemokine CCL2/metabolism
- Chemokine CCL4/genetics
- Chemokine CCL4/metabolism
- Chemokine CXCL2/metabolism
- Female
- Leukotriene B4/metabolism
- Lipoxygenase/metabolism
- Macrophages/metabolism
- Male
- Mice
- Mice, Inbred C57BL
- Myocardial Infarction/metabolism
- Myocardium/metabolism
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Receptors, Leukotriene B4/antagonists & inhibitors
- Receptors, Leukotriene B4/metabolism
- Serine-Threonine Kinase 3/genetics
- Serine-Threonine Kinase 3/metabolism
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Affiliation(s)
- Mingming Liu
- Tianjin Key Laboratory of Ion and Molecular Function of Cardiovascular Diseases, Tianjin Institute of Cardiology, State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), the Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics (M.L., M.Y., H.L., D.A.), Tianjin Medical University
- Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital (M.L.)
| | - Meng Yan
- Tianjin Key Laboratory of Ion and Molecular Function of Cardiovascular Diseases, Tianjin Institute of Cardiology, State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), the Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics (M.L., M.Y., H.L., D.A.), Tianjin Medical University
- The First Affiliated Hospital of Soochow University Department of Pathology, Soochow University, Suzhou (M.Y.)
| | - Jinlong He
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Huizhen Lv
- Tianjin Key Laboratory of Ion and Molecular Function of Cardiovascular Diseases, Tianjin Institute of Cardiology, State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), the Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics (M.L., M.Y., H.L., D.A.), Tianjin Medical University
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Zhipeng Chen
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Liyuan Peng
- Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan (L.P., C.C., D.-W.W.)
| | - Wenbin Cai
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Fang Yao
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College (F.Y., L.W.)
| | - Chen Chen
- Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan (L.P., C.C., D.-W.W.)
| | - Lei Shi
- Biochemistry and Molecular Biology, School of Basic Medical Sciences (L.S., K.Z.), Tianjin Medical University
| | - Kai Zhang
- Biochemistry and Molecular Biology, School of Basic Medical Sciences (L.S., K.Z.), Tianjin Medical University
| | - Xu Zhang
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Dao-Wen Wang
- Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan (L.P., C.C., D.-W.W.)
| | - Li Wang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College (F.Y., L.W.)
| | - Yi Zhu
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
| | - Ding Ai
- Tianjin Key Laboratory of Ion and Molecular Function of Cardiovascular Diseases, Tianjin Institute of Cardiology, State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), the Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics (M.L., M.Y., H.L., D.A.), Tianjin Medical University
- Physiology and Pathophysiology (J.H., H.L., Z.C., W.C., X.Z., Y.Z., D.A.), Tianjin Medical University
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5
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Morgan D, Berggren KL, Spiess CD, Smith HM, Tejwani A, Weir SJ, Lominska CE, Thomas SM, Gan GN. Mitogen-activated protein kinase-activated protein kinase-2 (MK2) and its role in cell survival, inflammatory signaling, and migration in promoting cancer. Mol Carcinog 2021; 61:173-199. [PMID: 34559922 DOI: 10.1002/mc.23348] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 08/25/2021] [Accepted: 08/27/2021] [Indexed: 12/19/2022]
Abstract
Cancer and the immune system share an intimate relationship. Chronic inflammation increases the risk of cancer occurrence and can also drive inflammatory mediators into the tumor microenvironment enhancing tumor growth and survival. The p38 MAPK pathway is activated both acutely and chronically by stress, inflammatory chemokines, chronic inflammatory conditions, and cancer. These properties have led to extensive efforts to find effective drugs targeting p38, which have been unsuccessful. The immediate downstream serine/threonine kinase and substrate of p38 MAPK, mitogen-activated-protein-kinase-activated-protein-kinase-2 (MK2) protects cells against stressors by regulating the DNA damage response, transcription, protein and messenger RNA stability, and motility. The phosphorylation of downstream substrates by MK2 increases inflammatory cytokine production, drives an immune response, and contributes to wound healing. By binding directly to p38 MAPK, MK2 is responsible for the export of p38 MAPK from the nucleus which gives MK2 properties that make it unique among the large number of p38 MAPK substrates. Many of the substrates of both p38 MAPK and MK2 are separated between the cytosol and nucleus and interfering with MK2 and altering this intracellular translocation has implications for the actions of both p38 MAPK and MK2. The inhibition of MK2 has shown promise in combination with both chemotherapy and radiotherapy as a method for controlling cancer growth and metastasis in a variety of cancers. Whereas the current data are encouraging the field requires the development of selective and well tolerated drugs to target MK2 and a better understanding of its effects for effective clinical use.
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Affiliation(s)
- Deri Morgan
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Kiersten L Berggren
- Department of Internal Medicine, Division of Medical Oncology, Section of Radiation Oncology, UNM School of Medicine, The University of New Mexico, Albuquerque, New Mexico, USA
| | - Colby D Spiess
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Hannah M Smith
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Ajay Tejwani
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Scott J Weir
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Christopher E Lominska
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Sufi M Thomas
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas, USA.,Department of Otolaryngology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Gregory N Gan
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, Kansas, USA.,Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas, USA
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6
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Nuclear P38: Roles in Physiological and Pathological Processes and Regulation of Nuclear Translocation. Int J Mol Sci 2020; 21:ijms21176102. [PMID: 32847129 PMCID: PMC7504396 DOI: 10.3390/ijms21176102] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/20/2020] [Accepted: 08/21/2020] [Indexed: 02/07/2023] Open
Abstract
The p38 mitogen-activated protein kinase (p38MAPK, termed here p38) cascade is a central signaling pathway that transmits stress and other signals to various intracellular targets in the cytoplasm and nucleus. More than 150 substrates of p38α/β have been identified, and this number is likely to increase. The phosphorylation of these substrates initiates or regulates a large number of cellular processes including transcription, translation, RNA processing and cell cycle progression, as well as degradation and the nuclear translocation of various proteins. Being such a central signaling cascade, its dysregulation is associated with many pathologies, particularly inflammation and cancer. One of the hallmarks of p38α/β signaling is its stimulated nuclear translocation, which occurs shortly after extracellular stimulation. Although p38α/β do not contain nuclear localization or nuclear export signals, they rapidly and robustly translocate to the nucleus, and they are exported back to the cytoplasm within minutes to hours. Here, we describe the physiological and pathological roles of p38α/β phosphorylation, concentrating mainly on the ill-reviewed regulation of p38α/β substrate degradation and nuclear translocation. In addition, we provide information on the p38α/β ’s substrates, concentrating mainly on the nuclear targets and their role in p38α/β functions. Finally, we also provide information on the mechanisms of nuclear p38α/β translocation and its use as a therapeutic target for p38α/β-dependent diseases.
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7
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He Z, Tao D, Xiong J, Lou F, Zhang J, Chen J, Dai W, Sun J, Wang Y. Phosphorylation of 5-LOX: The Potential Set-point of Inflammation. Neurochem Res 2020; 45:2245-2257. [PMID: 32671628 DOI: 10.1007/s11064-020-03090-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 06/11/2020] [Accepted: 07/06/2020] [Indexed: 12/12/2022]
Abstract
Inflammation secondary to tissue injuries serves as a double-edged sword that determines the prognosis of tissue repair. As one of the most important enzymes controlling the inflammation process by producing leukotrienes, 5-lipoxygenase (5-LOX, also called 5-LO) has been one of the therapeutic targets in regulating inflammation for a long time. Although a large number of 5-LOX inhibitors have been explored, only a few of them can be applied clinically. Surprisingly, phosphorylation of 5-LOX reveals great significance in regulating the subcellular localization of 5-LOX, which has proven to be an important mechanism underlying the enzymatic activities of 5-LOX. There are at least three phosphorylation sites in 5-LOX jointly to determine the final inflammatory outcomes, and adjustment of phosphorylation of 5-LOX at different phosphorylation sites brings hope to provide an unrecognized means to regulate inflammation. The present review intends to shed more lights into the set-point-like mechanisms of phosphorylation of 5-LOX and its possible clinical application by summarizing the biological properties of 5-LOX, the relationship of 5-LOX with neurodegenerative diseases and brain injuries, the phosphorylation of 5-LOX at different sites, the regulatory effects and mechanisms of phosphorylated 5-LOX upon inflammation, as well as the potential anti-inflammatory application through balancing the phosphorylation-depended set-point.
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Affiliation(s)
- Zonglin He
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China.,Faculty of Medicine, International school, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Di Tao
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China.,Faculty of Medicine, International school, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Jiaming Xiong
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Fangfang Lou
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Jiayuan Zhang
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Jinxia Chen
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Weixi Dai
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China.,Faculty of Medicine, International school, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Jing Sun
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China
| | - Yuechun Wang
- Department of Physiology, Basic Medical School, Jinan University, Huangpu Avenue 601, Tianhe District, Guangzhou, Guangdong Province, China.
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8
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Gilbert NC, Gerstmeier J, Schexnaydre EE, Börner F, Garscha U, Neau DB, Werz O, Newcomer ME. Structural and mechanistic insights into 5-lipoxygenase inhibition by natural products. Nat Chem Biol 2020; 16:783-790. [PMID: 32393899 DOI: 10.1038/s41589-020-0544-7] [Citation(s) in RCA: 122] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 04/06/2020] [Indexed: 12/31/2022]
Abstract
Leukotrienes (LT) are lipid mediators of the inflammatory response that are linked to asthma and atherosclerosis. LT biosynthesis is initiated by 5-lipoxygenase (5-LOX) with the assistance of the substrate-binding 5-LOX-activating protein at the nuclear membrane. Here, we contrast the structural and functional consequences of the binding of two natural product inhibitors of 5-LOX. The redox-type inhibitor nordihydroguaiaretic acid (NDGA) is lodged in the 5-LOX active site, now fully exposed by disordering of the helix that caps it in the apo-enzyme. In contrast, the allosteric inhibitor 3-acetyl-11-keto-beta-boswellic acid (AKBA) from frankincense wedges between the membrane-binding and catalytic domains of 5-LOX, some 30 Å from the catalytic iron. While enzyme inhibition by NDGA is robust, AKBA promotes a shift in the regiospecificity, evident in human embryonic kidney 293 cells and in primary immune cells expressing 5-LOX. Our results suggest a new approach to isoform-specific 5-LOX inhibitor development through exploitation of an allosteric site in 5-LOX.
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Affiliation(s)
- Nathaniel C Gilbert
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Jana Gerstmeier
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Erin E Schexnaydre
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Friedemann Börner
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Ulrike Garscha
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - David B Neau
- Cornell University, Northeastern Collaborative Access Team, Argonne National Laboratory, Argonne, IL, USA
| | - Oliver Werz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany.
| | - Marcia E Newcomer
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA.
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9
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Emerging Roles of 5-Lipoxygenase Phosphorylation in Inflammation and Cell Death. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2749173. [PMID: 31871543 PMCID: PMC6906800 DOI: 10.1155/2019/2749173] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/30/2019] [Accepted: 11/11/2019] [Indexed: 12/12/2022]
Abstract
5-Lipoxygenase (ALOX5) is an iron-containing and nonheme dioxygenase that catalyzes the peroxidation of polyunsaturated fatty acids such as arachidonic acid. ALOX5 is the rate-limiting enzyme for the biosynthesis of leukotrienes, a family of proinflammatory lipid mediators derived from arachidonic acid. ALOX5 also make great contributions to mediating lipid peroxidation. In recent years, it has been discovered that ALOX5 plays a central role in cell death including apoptosis, pyroptosis, and ferroptosis, a newly discovered type of cell death. According to the previous studies, ALOX5 can regulate cell death in two ways: one is inflammation and the other is lipid peroxidation. Meanwhile, it has been shown that ALOX5 activity is regulated by several factors including protein phosphorylation, ALOX5-interactng protein, redox state, and metal ions such as iron and calcium. In this review, we aim to summarize the knowledge on the emerging roles of ALOX5 protein phosphorylation in the regulation of cell death and inflammation in order to explore a potential target for human diseases.
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10
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HMGB1-C1q complexes regulate macrophage function by switching between leukotriene and specialized proresolving mediator biosynthesis. Proc Natl Acad Sci U S A 2019; 116:23254-23263. [PMID: 31570601 DOI: 10.1073/pnas.1907490116] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Macrophage polarization is critical to inflammation and resolution of inflammation. We previously showed that high-mobility group box 1 (HMGB1) can engage receptor for advanced glycation end product (RAGE) to direct monocytes to a proinflammatory phenotype characterized by production of type 1 IFN and proinflammatory cytokines. In contrast, HMGB1 plus C1q form a tetramolecular complex cross-linking RAGE and LAIR-1 and directing monocytes to an antiinflammatory phenotype. Lipid mediators, as well as cytokines, help establish a milieu favoring either inflammation or resolution of inflammation. This study focuses on the induction of lipid mediators by HMGB1 and HMGB1 plus C1q and their regulation of IRF5, a transcription factor critical for the induction and maintenance of proinflammatory macrophages. Here, we show that HMGB1 induces leukotriene production through a RAGE-dependent pathway, while HMGB1 plus C1q induces specialized proresolving lipid mediators lipoxin A4, resolvin D1, and resolvin D2 through a RAGE- and LAIR-1-dependent pathway. Leukotriene exposure contributes to induction of IRF5 in a positive-feedback loop. In contrast, resolvins (at 20 nM) block IRF5 induction and prevent the differentiation of inflammatory macrophages. Finally, we have generated a molecular mimic of HMGB1 plus C1q, which cross-links RAGE and LAIR-1 and polarizes monocytes to an antiinflammatory phenotype. These findings may provide a mechanism to control nonresolving inflammation in many pathologic conditions.
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11
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Häfner AK, Kahnt AS, Steinhilber D. Beyond leukotriene formation—The noncanonical functions of 5-lipoxygenase. Prostaglandins Other Lipid Mediat 2019; 142:24-32. [DOI: 10.1016/j.prostaglandins.2019.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/14/2019] [Accepted: 03/25/2019] [Indexed: 01/17/2023]
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12
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López-Vicario C, Titos E, Walker ME, Alcaraz-Quiles J, Casulleras M, Durán-Güell M, Flores-Costa R, Pérez-Romero N, Forné M, Dalli J, Clària J. Leukocytes from obese individuals exhibit an impaired SPM signature. FASEB J 2019; 33:7072-7083. [DOI: 10.1096/fj.201802587r] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Cristina López-Vicario
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
| | - Esther Titos
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
- Department of Biomedical SciencesUniversity of BarcelonaBarcelonaSpain
| | - Mary E. Walker
- Lipid Mediator UnitBiochemical PharmacologyWilliam Harvey Research InstituteBarts and the London School of MedicineQueen Mary University of LondonLondonUnited Kingdom
- Centre for Inflammation and Therapeutic InnovationQueen Mary University of LondonLondonUnited Kingdom
| | - José Alcaraz-Quiles
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
| | - Mireia Casulleras
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
| | - Marta Durán-Güell
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
| | - Roger Flores-Costa
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
| | | | - Montserrat Forné
- Gastroenterology DepartmentHospital Universitari Mútua TerrassaTerrassaSpain
| | - Jesmond Dalli
- Lipid Mediator UnitBiochemical PharmacologyWilliam Harvey Research InstituteBarts and the London School of MedicineQueen Mary University of LondonLondonUnited Kingdom
- Centre for Inflammation and Therapeutic InnovationQueen Mary University of LondonLondonUnited Kingdom
| | - Joan Clària
- Biochemistry and Molecular Genetics ServiceHospital Clínic—Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of BarcelonaCentro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)MadridSpain
- Department of Biomedical SciencesUniversity of BarcelonaBarcelonaSpain
- European Foundation for the Study of Chronic Liver Failure (EF Clif)BarcelonaSpain
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13
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Archambault AS, Turcotte C, Martin C, Provost V, Larose MC, Laprise C, Chakir J, Bissonnette É, Laviolette M, Bossé Y, Flamand N. Comparison of eight 15-lipoxygenase (LO) inhibitors on the biosynthesis of 15-LO metabolites by human neutrophils and eosinophils. PLoS One 2018; 13:e0202424. [PMID: 30118527 PMCID: PMC6097673 DOI: 10.1371/journal.pone.0202424] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 08/02/2018] [Indexed: 12/22/2022] Open
Abstract
Neutrophils and eosinophils are important sources of bioactive lipids from the 5- and the 15-lipoxygenase (LO) pathways. Herein, we compared the effectiveness of humans eosinophils and eosinophil-depleted neutrophils to synthesize 15-LO metabolites using a cocktail of different 15-LO substrates as well as their sensitivities to eight documented 15-lipoxygenase inhibitors. The treatment of neutrophils and eosinophils with linoleic acid, dihomo-γ-linolenic acid, arachidonic acid, eicosapentaenoic acid, docosahexaenoic acid and arachidonyl-ethanolamide, led to the synthesis of 13-HODE, 15-HETrE, 15-HETE, 15-HEPE, 14-HDHA/17-HDHA, and 15-hydroxy-AEA. Neutrophils and eosinophils also metabolized the endocannabinoid 2-arachidonoyl-glycerol into 15-HETE-glycerol, although this required 2-arachidonoyl-glycerol hydrolysis inhibition. Neutrophils and eosinophils differed in regard to dihomo-γ-linolenic acid and linoleic acid utilization with 15-HETrE/13-HODE ratios of 0.014 ± 0.0008 and 0.474 ± 0.114 for neutrophils and eosinophils respectively. 15-LO metabolite synthesis by neutrophils and eosinophils also differed in regard to their relative production of 17-HDHA and 14-HDHA.The synthesis of 15-LO metabolites by neutrophils was concentration-dependent and rapid, reaching a plateau after one minute. While investigating the biosynthetic routes involved, we found that eosinophil-depleted neutrophils express the 15-lipoxygenase-2 but not the 15-LO-1, in contrast to eosinophils which express the 15-LO-1 but not the 15-LO-2. Moreover, 15-LO metabolite synthesis by neutrophils was not inhibited by the 15-LO-1 inhibitors BLX769, BLX3887, and ML351. However, 15-LO product synthesis was partially inhibited by 100 μM NDGA. Altogether, our data indicate that the best 15-LO-1 inhibitors in eosinophils are BLX3887, BLX769, NDGA and ML351 and that the synthesis of 15-LO metabolites by neutrophils does not involve the 15-LO-1 nor the phosphorylation of 5-LO on Ser-663 but is rather the consequence of 15-LO-2 or another unidentified 15-LO.
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Affiliation(s)
- Anne-Sophie Archambault
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Caroline Turcotte
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Cyril Martin
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Véronique Provost
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Marie-Chantal Larose
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Catherine Laprise
- Centre intégré universitaire de santé et services sociaux du Saguenay–Lac-Saint-Jean, Département de sciences fondamentales, Université du Québec à Chicoutimi, Saguenay, QC, Canada
| | - Jamila Chakir
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Élyse Bissonnette
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Michel Laviolette
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Ynuk Bossé
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
| | - Nicolas Flamand
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Département de médecine, Faculté de médecine, Université Laval, Québec City, QC, Canada
- * E-mail:
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14
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Brand S, Roy S, Schröder P, Rathmer B, Roos J, Kapoor S, Patil S, Pommerenke C, Maier T, Janning P, Eberth S, Steinhilber D, Schade D, Schneider G, Kumar K, Ziegler S, Waldmann H. Combined Proteomic and In Silico Target Identification Reveal a Role for 5-Lipoxygenase in Developmental Signaling Pathways. Cell Chem Biol 2018; 25:1095-1106.e23. [PMID: 30251630 DOI: 10.1016/j.chembiol.2018.05.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 02/26/2018] [Accepted: 05/22/2018] [Indexed: 12/21/2022]
Abstract
Identification and validation of the targets of bioactive small molecules identified in cell-based screening is challenging and often meets with failure, calling for the development of new methodology. We demonstrate that a combination of chemical proteomics with in silico target prediction employing the SPiDER method may provide efficient guidance for target candidate selection and prioritization for experimental in-depth evaluation. We identify 5-lipoxygenase (5-LO) as the target of the Wnt pathway inhibitor Lipoxygenin. Lipoxygenin is a non-redox 5-LO inhibitor, modulates the β-catenin-5-LO complex and induces reduction of both β-catenin and 5-LO levels in the nucleus. Lipoxygenin and the structurally unrelated 5-LO inhibitor CJ-13,610 promote cardiac differentiation of human induced pluripotent stem cells and inhibit Hedgehog, TGF-β, BMP, and Activin A signaling, suggesting an unexpected and yet unknown role of 5-LO in these developmental pathways.
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Affiliation(s)
- Silke Brand
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany; Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, Dortmund 44227, Germany
| | - Sayantani Roy
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Peter Schröder
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany; Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, Dortmund 44227, Germany
| | - Bernd Rathmer
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, Dortmund 44227, Germany
| | - Jessica Roos
- Goethe Universität, Institut für Pharmazeutische Chemie, Max-von-Laue-Strasse 9, Frankfurt am Main 60438, Germany
| | - Shobhna Kapoor
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Sumersing Patil
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Claudia Pommerenke
- Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, Braunschweig 38124, Germany
| | - Thorsten Maier
- Department for Anesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Theodor-Stern-Kai 7, Frankfurt 60590, Germany; Aarhus University, Department of Biomedicine, Bartholins Allé 6, Aarhus C 8000, Denmark
| | - Petra Janning
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Sonja Eberth
- Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, Braunschweig 38124, Germany
| | - Dieter Steinhilber
- Goethe Universität, Institut für Pharmazeutische Chemie, Max-von-Laue-Strasse 9, Frankfurt am Main 60438, Germany
| | - Dennis Schade
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, Dortmund 44227, Germany
| | - Gisbert Schneider
- ETH Zürich, Institut für Pharmazeutische Wissenschaften, Vladimir-Prelog-Weg 1-5/10, Zürich CH-8093, Switzerland
| | - Kamal Kumar
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Slava Ziegler
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany
| | - Herbert Waldmann
- Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, Dortmund 44227, Germany; Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, Dortmund 44227, Germany.
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15
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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: 47] [Impact Index Per Article: 7.8] [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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16
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Nunns GR, Stringham JR, Gamboni F, Moore EE, Fragoso M, Stettler GR, Silliman CC, Banerjee A. Trauma and hemorrhagic shock activate molecular association of 5-lipoxygenase and 5-lipoxygenase-Activating protein in lung tissue. J Surg Res 2018; 229:262-270. [PMID: 29936999 DOI: 10.1016/j.jss.2018.03.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 02/02/2018] [Accepted: 03/14/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND Post-traumatic lung injury following trauma and hemorrhagic shock (T/HS) is associated with significant morbidity. Leukotriene-induced inflammation has been implicated in the development of post-traumatic lung injury through a mechanism that is only partially understood. Postshock mesenteric lymph returning to the systemic circulation is rich in arachidonic acid, the substrate of 5-lipoxygenase (ALOX5). ALOX5 is the rate-limiting enzyme in leukotriene synthesis and, following T/HS, contributes to the development of lung dysfunction. ALOX5 colocalizes with its cofactor, 5-lipoxygenase-activating protein (ALOX5AP), which is thought to potentiate ALOX5 synthetic activity. We hypothesized that T/HS results in the molecular association and nuclear colocalization of ALOX5 and ALOX5AP, which ultimately increases leukotriene production and potentiates lung injury. MATERIALS AND METHODS To examine these molecular interactions, a rat T/HS model was used. Post-T/HS tissue was evaluated for lung injury through both histologic analysis of lung sections and biochemical analysis of bronchoalveolar lavage fluid. Lung tissue was immunostained for ALOX5 and ALOX5AP with association and colocalization evaluated by fluorescence resonance energy transfer. In addition, rats undergoing T/HS were treated with MK-886, a known ALOX5AP inhibitor. RESULTS ALOX5 levels increase and ALOX5/ALOX5AP association occurred after T/HS, as evidenced by increases in total tissue fluorescence and fluorescence resonance energy transfer signal intensity, respectively. These findings coincided with increased leukotriene production and with the histological changes characteristic of lung injury. ALOX5/ALOX5AP complex formation, leukotriene production, and lung injury were decreased after inhibition of ALOX5AP with MK-886. CONCLUSIONS These results suggest that the association of ALOX5/ALOX5AP contributes to leukotriene-induced inflammation and predisposes the T/HS animal to lung injury.
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Affiliation(s)
- Geoffrey R Nunns
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado.
| | - John R Stringham
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado
| | - Fabia Gamboni
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado
| | - Ernest E Moore
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado; Denver Health Medical Center, Department of Surgery, Denver, Colorado
| | - Miguel Fragoso
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado; Denver Health Medical Center, Department of Surgery, Denver, Colorado
| | - Gregory R Stettler
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado
| | - Christopher C Silliman
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado; School of Medicine, Department of Pediatrics-Hematology/Oncology, Children's Hospital Colorado, University of Colorado Denver, Aurora, Colorado; Research Laboratory, Bonfils Blood Center, Denver, Colorado
| | - Anirban Banerjee
- School of Medicine, Department of Surgery, Trauma Research Center, University of Colorado Denver, Aurora, Colorado
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17
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Abstract
The lymphatic system is essential for the maintenance of tissue fluid homeostasis, gastrointestinal lipid absorption, and immune trafficking. Whereas lymphatic regeneration occurs physiologically in wound healing and tissue repair, pathological lymphangiogenesis has been implicated in a number of chronic diseases such as lymphedema, atherosclerosis, and cancer. Insight into the regulatory mechanisms of lymphangiogenesis and the manner in which uncontrolled inflammation promotes lymphatic dysfunction is urgently needed to guide the development of novel therapeutics: These would be designed to reverse lymphatic dysfunction, either primary or acquired. Recent investigation has demonstrated the mechanistic role of leukotriene B4 (LTB4) in the molecular pathogenesis of lymphedema. LTB4, a product of the innate immune response, is a constituent of the eicosanoid inflammatory mediator family of molecules that promote both physiological and pathological inflammation. Here we provide an overview of lymphatic development, the pathophysiology of lymphedema, and the role of leukotrienes in lymphedema pathogenesis.
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Affiliation(s)
- Xinguo Jiang
- VA Palo Alto Health Care System, Palo Alto, California 94304, USA.,Stanford University School of Medicine, Stanford, California 94305, USA;
| | - Mark R Nicolls
- VA Palo Alto Health Care System, Palo Alto, California 94304, USA.,Stanford University School of Medicine, Stanford, California 94305, USA;
| | - Wen Tian
- VA Palo Alto Health Care System, Palo Alto, California 94304, USA.,Stanford University School of Medicine, Stanford, California 94305, USA;
| | - Stanley G Rockson
- Stanford University School of Medicine, Stanford, California 94305, USA;
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18
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Ball AK, Beilstein K, Wittmann S, Sürün D, Saul MJ, Schnütgen F, Flamand N, Capelo R, Kahnt AS, Frey H, Schaefer L, Marschalek R, Häfner AK, Steinhilber D. Characterization and cellular localization of human 5-lipoxygenase and its protein isoforms 5-LOΔ13, 5-LOΔ4 and 5-LOp12. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:561-571. [PMID: 28257804 DOI: 10.1016/j.bbalip.2017.02.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/06/2017] [Accepted: 02/24/2017] [Indexed: 01/29/2023]
Abstract
Human 5-lipoxygenase (5-LO-WT) initiates the leukotriene (LT) biosynthesis. LTs play an important role in diseases like asthma, atherosclerosis and in many types of cancer. In this study, we investigated the 5-LO isoforms 5-LO∆13, 5-LO∆4 and 5-LOp12, lacking the exons 13, 4 or a part of exon 12, respectively. We were able to detect the mRNA of the isoforms 5-LO∆13 and 5-LOp12 in B and T cell lines as well as in primary B and T cells and monocytes. Furthermore, we found that expression of 5-LO and particularly of the 5-LO∆13 and 5-LOp12 isoforms is increased in monocytes from patients with rheumatoid arthritis and sepsis. Confocal microscopy of HEK293T cells stably transfected with tagged 5-LO-WT and/or the isoforms revealed that 5-LO-WT is localized in the nucleus whereas all isoforms are located in the cytosol. Additionally, all isoforms are catalytically inactive and do not seem to influence the specific activity of 5-LO-WT. S271A mutation in 5-LO-WT and treatment of the cells with sorbitol or KN-93/SB203580 changes the localization of the WT enzyme to the cytosol. Despite colocalization with the S271A mutant, the isoforms did not affect LT biosynthesis. Analysis of the phosphorylation pattern of 5-LO-WT and all the isoforms revealed that 5-LOp12 and 5-LO∆13 are highly phosphorylated at Ser271 and 5-LOp12 at Ser523. Furthermore, coexpression of the isoforms inhibited or stimulated 5-LO-WT expression in transiently and stably transfected HEK293T cells suggesting that the isoforms have other functions than canonical LT biosynthesis.
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Affiliation(s)
- Ann-Katrin Ball
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Kim Beilstein
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Sandra Wittmann
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Duran Sürün
- Department of Molecular Hematology, Goethe University Medical School, 60590 Frankfurt am Main, Germany
| | - Meike J Saul
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Frank Schnütgen
- Department of Molecular Hematology, Goethe University Medical School, 60590 Frankfurt am Main, Germany
| | - Nicolas Flamand
- Centre de recherche de l'IUCPQ, Département de Médecine et Faculté de Médecine, Université Laval, Québec, QC G1V 4G5, Canada
| | - Ricardo Capelo
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Astrid S Kahnt
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Helena Frey
- General Pharmacology and Toxicology, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany
| | - Liliana Schaefer
- General Pharmacology and Toxicology, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany
| | - Rolf Marschalek
- Institute of Pharmaceutical Biology, Goethe-University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Ann-Kathrin Häfner
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
| | - Dieter Steinhilber
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
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19
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Moore GY, Pidgeon GP. Cross-Talk between Cancer Cells and the Tumour Microenvironment: The Role of the 5-Lipoxygenase Pathway. Int J Mol Sci 2017; 18:E236. [PMID: 28125014 PMCID: PMC5343774 DOI: 10.3390/ijms18020236] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 01/03/2017] [Accepted: 01/13/2017] [Indexed: 12/15/2022] Open
Abstract
5-lipoxygenase is an enzyme responsible for the synthesis of a range of bioactive lipids signalling molecules known collectively as eicosanoids. 5-lipoxygenase metabolites such as 5-hydroxyeicosatetraenoic acid (5-HETE) and a number of leukotrienes are mostly derived from arachidonic acid and have been shown to be lipid mediators of inflammation in different pathological states including cancer. Upregulated 5-lipoxygenase expression and metabolite production is found in a number of cancer types and has been shown to be associated with increased tumorigenesis. 5-lipoxygenase activity is present in a number of diverse cell types of the immune system and connective tissue. In this review, we discuss potential routes through which cancer cells may utilise the 5-lipoxygenase pathway to interact with the tumour microenvironment during the development and progression of a tumour. Furthermore, immune-derived 5-lipoxygenase signalling can drive both pro- and anti-tumour effects depending on the immune cell subtype and an overview of evidence for these opposing effects is presented.
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Affiliation(s)
- Gillian Y Moore
- Department of Surgery, Trinity College Dublin, Dublin 8, Ireland.
| | - Graham P Pidgeon
- Department of Surgery, Trinity College Dublin, Dublin 8, Ireland.
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20
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Werz O, Gerstmeier J, Garscha U. Novel leukotriene biosynthesis inhibitors (2012-2016) as anti-inflammatory agents. Expert Opin Ther Pat 2017; 27:607-620. [DOI: 10.1080/13543776.2017.1276568] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Oliver Werz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University Jena, Jena, Germany
| | - Jana Gerstmeier
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University Jena, Jena, Germany
| | - Ulrike Garscha
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University Jena, Jena, Germany
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21
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MerTK cleavage limits proresolving mediator biosynthesis and exacerbates tissue inflammation. Proc Natl Acad Sci U S A 2016; 113:6526-31. [PMID: 27199481 DOI: 10.1073/pnas.1524292113] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The acute inflammatory response requires a coordinated resolution program to prevent excessive inflammation, repair collateral damage, and restore tissue homeostasis, and failure of this response contributes to the pathology of numerous chronic inflammatory diseases. Resolution is mediated in part by long-chain fatty acid-derived lipid mediators called specialized proresolving mediators (SPMs). However, how SPMs are regulated during the inflammatory response, and how this process goes awry in inflammatory diseases, are poorly understood. We now show that signaling through the Mer proto-oncogene tyrosine kinase (MerTK) receptor in cultured macrophages and in sterile inflammation in vivo promotes SPM biosynthesis by a mechanism involving an increase in the cytoplasmic:nuclear ratio of a key SPM biosynthetic enzyme, 5-lipoxygenase. This action of MerTK is linked to the resolution of sterile peritonitis and, after ischemia-reperfusion (I/R) injury, to increased circulating SPMs and decreased remote organ inflammation. MerTK is susceptible to ADAM metallopeptidase domain 17 (ADAM17)-mediated cell-surface cleavage under inflammatory conditions, but the functional significance is not known. We show here that SPM biosynthesis is increased and inflammation resolution is improved in a new mouse model in which endogenous MerTK was replaced with a genetically engineered variant that is cleavage-resistant (Mertk(CR)). Mertk(CR) mice also have increased circulating levels of SPMs and less lung injury after I/R. Thus, MerTK cleavage during inflammation limits SPM biosynthesis and the resolution response. These findings contribute to our understanding of how SPM synthesis is regulated during the inflammatory response and suggest new therapeutic avenues to boost resolution in settings where defective resolution promotes disease progression.
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Abstract
An effective host defense mechanism involves inflammation to eliminate pathogens from the site of infection, followed by the resolution of inflammation and the restoration of tissue homeostasis. Lipoxins are endogenous anti-inflammatory, pro-resolving molecules that play a vital role in reducing excessive tissue injury and chronic inflammation. In this review, the mechanisms of action of lipoxins at the site of inflammation and their interaction with other cellular signaling molecules and transcription factors are discussed. Emphasis has also been placed on immune modulatory role(s) of lipoxins. Lipoxins regulate components of both the innate and adaptive immune systems including neutrophils, macrophages, T-, and B-cells. Lipoxins also modulate levels of various transcription factors such as nuclear factor κB, activator protein-1, nerve growth factor-regulated factor 1A binding protein 1, and peroxisome proliferator activated receptor γ and control the expression of many inflammatory genes. Since lipoxins and aspirin-triggered lipoxins have clinical relevance, we discuss their important role in clinical research to treat a wide range of diseases like inflammatory disorders, renal fibrosis, cerebral ischemia, and cancer. A brief overview of lipoxins in viral malignancies and viral pathogenesis especially the unexplored role of lipoxins in Kaposi’s sarcoma-associated herpes virus biology is also presented.
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Affiliation(s)
- Jayashree A Chandrasekharan
- HM Bligh Cancer Research Laboratories, Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Neelam Sharma-Walia
- HM Bligh Cancer Research Laboratories, Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
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Mahshid Y, Markoutsa S, Dincbas-Renqvist V, Sürün D, Christensson B, Sander B, Björkholm M, Sorg BL, Rådmark O, Claesson HE. Phosphorylation of serine 523 on 5-lipoxygenase in human B lymphocytes. Prostaglandins Leukot Essent Fatty Acids 2015. [PMID: 26210919 DOI: 10.1016/j.plefa.2015.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The key enzyme in leukotriene (LT) biosynthesis is 5-lipoxygenase (5-LO), which is expressed in myeloid cells and in B lymphocytes. There are three phosphorylation sites on 5-LO (Ser271, Ser523 and Ser663). Protein kinase A (PKA) phosphorylates 5-LO on Ser523. In this report, we demonstrate by immunoblotting that native 5-LO in mantle B cell lymphoma (MCL) cells (Granta519, JEKO1, and Rec1) and in primary chronic B lymphocytic leukemia cells (B-CLL) is phosphorylated on Ser523. In contrast, we could not detect phosphorylation of 5-LO on Ser523 in human granulocytes or monocytes. Phosphorylated 5-LO was purified from Rec1 cells, using an ATP-agarose column, and the partially purified enzyme could be dephosphorylated with alkaline phosphatase. Incubation of Rec1 cells with 8-Br-cAMP or prostaglandin E2 stimulated phosphorylation at Ser523. Furthermore, FLAG-5LO was expressed in Rec1 cells, and the cells were cultivated in the presence of 8-Br-cAMP. The 5-LO protein from these cells was immunoprecipitated, first with anti-FLAG, followed by anti-pSer523-5-LO. The presence of 5-LO protein in the final precipitate further supported the finding that the protein recognized by the pSer523 antibody was 5-LO. Taken together, this study shows that 5-LO in B cells is phosphorylated on Ser523 and demonstrates for the first time a chemical difference between 5-LO in myeloid cells and B cells.
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Affiliation(s)
- Yilmaz Mahshid
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Stavroula Markoutsa
- Institute of Pharmaceutical Chemistry/ZAFES, Goethe-University, 60438 Frankfurt am Main, Germany
| | - Vildan Dincbas-Renqvist
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Duran Sürün
- University of Frankfurt Medical School, Department of Molecular Hematology, 60590 Frankfurt am Main, Germany
| | - Birger Christensson
- Department of Laboratory Medicine, Division of Pathology, Karolinska University Hospital Huddinge and Karolinska Institutet, 141 86 Stockholm, Sweden
| | - Birgitta Sander
- Department of Laboratory Medicine, Division of Pathology, Karolinska University Hospital Huddinge and Karolinska Institutet, 141 86 Stockholm, Sweden
| | - Magnus Björkholm
- Department of Medicine, Karolinska Hospital Solna and Karolinska Institutet, 171 76 Stockholm, Sweden
| | - Bernd L Sorg
- Institute of Pharmaceutical Chemistry/ZAFES, Goethe-University, 60438 Frankfurt am Main, Germany
| | - Olof Rådmark
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Hans-Erik Claesson
- Department of Medicine, Karolinska Hospital Solna and Karolinska Institutet, 171 76 Stockholm, Sweden.
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The Intracellular Localisation and Phosphorylation Profile of the Human 5-Lipoxygenase Δ13 Isoform Differs from That of Its Full Length Counterpart. PLoS One 2015; 10:e0132607. [PMID: 26173130 PMCID: PMC4501781 DOI: 10.1371/journal.pone.0132607] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 06/16/2015] [Indexed: 01/31/2023] Open
Abstract
5-Lipoxygenase (5-LO) catalyzes leukotriene (LT) biosynthesis by a mechanism that involves interactions with 5-lipoxygenase activating protein (FLAP) and coactosin-like protein (CLP). 5-LO splice variants were recently identified in human myeloid and lymphoid cells, including the catalytically inactive ∆13 isoform (5-LO∆13) whose transcript lacks exon 13. 5-LO∆13 inhibits 5-LO product biosynthesis when co-expressed with active full length 5-LO (5-LO1). The objective of this study was to investigate potential mechanisms by which 5-LO∆13 interferes with 5-LO product biosynthesis in transfected HEK293 cells. When co-expressed with 5-LO1, 5-LO∆13 inhibited LT but not 5-hydroxyeicosatetraenoic acid (5-HETE) biosynthesis. This inhibition was independent of 5-LO∆13—FLAP interactions since it occurred in cells expressing FLAP or not. In cell-free assays CLP enhances 5-LO activity through interactions with tryptophan-102 of 5-LO. In the current study, the requirement for W102 was extended to whole cells, as cells expressing the 5-LO1-W102A mutant produced little 5-LO products. W102A mutants of 5-LO∆13 inhibited 5-LO product biosynthesis as effectively as 5-LO∆13 suggesting that inhibition is independent of interactions with CLP. Confocal microscopy showed that 5-LO1 was primarily in the nucleoplasm whereas W102A mutants showed a diffuse cellular expression. Despite the retention of known nuclear localisation sequences, 5-LO∆13 was cytosolic and concentrated in ER-rich perinuclear regions where its effect on LT biosynthesis may occur. W102A mutants of 5-LO∆13 showed the same pattern. Consistent with subcellular distribution patterns, 5-LO∆13 was hyper-phosphorylated on S523 and S273 compared to 5-LO1. Together, these results reveal a role for W102 in nuclear targeting of 5-LO1 suggesting that interactions with CLP are required for nuclear localization of 5-LO1, and are an initial characterisation of the 5-LO∆13 isoform whose inhibition of LT biosynthesis appears independent of interactions with CLP and FLAP. Better knowledge of the regulation and properties of alternative 5-LO isoforms will contribute to understanding the complex regulation of LT biosynthesis.
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Bessadóttir M, Eiríksson FF, Becker S, Ögmundsdóttir MH, Ómarsdóttir S, Thorsteinsdóttir M, Ögmundsdóttir HM. Anti-proliferative and pro-apoptotic effects of lichen-derived compound protolichesterinic acid are not mediated by its lipoxygenase-inhibitory activity. Prostaglandins Leukot Essent Fatty Acids 2015; 98:39-47. [PMID: 25964147 DOI: 10.1016/j.plefa.2015.04.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 04/01/2015] [Accepted: 04/19/2015] [Indexed: 10/23/2022]
Abstract
Lipoxygenases (LOXs) and their products are involved in several biological functions and have been associated with carcinogenesis. Protolichesterinic acid (PA), a lichen metabolite, inhibits 5- and 12-LOX and has anti-proliferative effects on various cancer cell lines. Here, PA was shown to inhibit proliferation of multiple myeloma cells, RPMI 8226 and U266, and pancreatic cancer cells AsPC-1. Apoptosis was induced only in multiple myeloma cells. Cell-cycle associated changes in expression and sub-cellular localization of 5- and 12-LOX were not affected by PA but increased cytoplasmic localisation was found to accompany morphological changes at later stages. Assessment by mass spectrometry showed that PA entered the pancreatic cancer cells. However, effects on LOX metabolites were only evident after treatment with concentrations exceeding those having anti-proliferative effects and no effects were measurable in the myeloma cells. We conclude that the anti-proliferative and pro-apoptotic effects of PA are not mediated directly through inhibition of LOX activity.
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Affiliation(s)
- M Bessadóttir
- Faculty of Medicine, University of Iceland, 101 Reykjavik, Iceland; Faculty of Pharmaceutical Sciences, University of Iceland, 101 Reykjavik, Iceland
| | - F F Eiríksson
- Faculty of Medicine, University of Iceland, 101 Reykjavik, Iceland; Faculty of Pharmaceutical Sciences, University of Iceland, 101 Reykjavik, Iceland
| | - S Becker
- Faculty of Medicine, University of Iceland, 101 Reykjavik, Iceland
| | | | - S Ómarsdóttir
- Faculty of Pharmaceutical Sciences, University of Iceland, 101 Reykjavik, Iceland
| | - M Thorsteinsdóttir
- Faculty of Pharmaceutical Sciences, University of Iceland, 101 Reykjavik, Iceland
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26
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Horn T, Adel S, Schumann R, Sur S, Kakularam KR, Polamarasetty A, Redanna P, Kuhn H, Heydeck D. Evolutionary aspects of lipoxygenases and genetic diversity of human leukotriene signaling. Prog Lipid Res 2014; 57:13-39. [PMID: 25435097 PMCID: PMC7112624 DOI: 10.1016/j.plipres.2014.11.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 11/17/2014] [Accepted: 11/19/2014] [Indexed: 12/14/2022]
Abstract
Leukotrienes are pro-inflammatory lipid mediators, which are biosynthesized via the lipoxygenase pathway of the arachidonic acid cascade. Lipoxygenases form a family of lipid peroxidizing enzymes and human lipoxygenase isoforms have been implicated in the pathogenesis of inflammatory, hyperproliferative (cancer) and neurodegenerative diseases. Lipoxygenases are not restricted to humans but also occur in a large number of pro- and eucaryotic organisms. Lipoxygenase-like sequences have been identified in the three domains of life (bacteria, archaea, eucarya) but because of lacking functional data the occurrence of catalytically active lipoxygenases in archaea still remains an open question. Although the physiological and/or pathophysiological functions of various lipoxygenase isoforms have been studied throughout the last three decades there is no unifying concept for the biological importance of these enzymes. In this review we are summarizing the current knowledge on the distribution of lipoxygenases in living single and multicellular organisms with particular emphasis to higher vertebrates and will also focus on the genetic diversity of enzymes and receptors involved in human leukotriene signaling.
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Affiliation(s)
- Thomas Horn
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany; Department of Chemistry and Biochemistry, University of California - Santa Cruz, 1156 High Street, 95064 Santa Cruz, USA
| | - Susan Adel
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany
| | - Ralf Schumann
- Institute of Microbiology, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Saubashya Sur
- Institute of Microbiology, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Kumar Reddy Kakularam
- Department of Animal Sciences, School of Life Science, University of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India
| | - Aparoy Polamarasetty
- School of Life Sciences, University of Himachal Pradesh, Dharamshala, Himachal Pradesh 176215, India
| | - Pallu Redanna
- Department of Animal Sciences, School of Life Science, University of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India; National Institute of Animal Biotechnology, Miyapur, Hyderabad 500049, Telangana, India
| | - Hartmut Kuhn
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany.
| | - Dagmar Heydeck
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany
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Phosphorylation mimicking mutations of ALOX5 orthologs of different vertebrates do not alter reaction specificities of the enzymes. Biochim Biophys Acta Mol Cell Biol Lipids 2014; 1842:1460-6. [DOI: 10.1016/j.bbalip.2014.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 06/19/2014] [Accepted: 07/07/2014] [Indexed: 12/19/2022]
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Rådmark O, Werz O, Steinhilber D, Samuelsson B. 5-Lipoxygenase, a key enzyme for leukotriene biosynthesis in health and disease. Biochim Biophys Acta Mol Cell Biol Lipids 2014; 1851:331-9. [PMID: 25152163 DOI: 10.1016/j.bbalip.2014.08.012] [Citation(s) in RCA: 336] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 08/13/2014] [Accepted: 08/14/2014] [Indexed: 12/21/2022]
Abstract
5-Lipoxygenase (5-LOX) catalyzes two steps in the biosynthesis of leukotrienes (LTs), lipid mediators of inflammation derived from arachidonic acid. In this review we focus on 5-LOX biochemistry including 5-LOX interacting proteins and regulation of enzyme activity. LTs function in normal host defense, and have roles in many disease states where acute or chronic inflammation is part of the pathophysiology, as briefly summarized at the end of this chapter. This article is part of a Special Issue entitled "Oxygenated metabolism of PUFA: analysis and biological relevance".
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Affiliation(s)
- Olof Rådmark
- Dept of Medical Biochemistry and Biophysics, Div. of Chemistry II, Karolinska Institutet, Sweden
| | - Oliver Werz
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, University Jena, Germany
| | - Dieter Steinhilber
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Germany
| | - Bengt Samuelsson
- Dept of Medical Biochemistry and Biophysics, Div. of Chemistry II, Karolinska Institutet, Sweden
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29
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Tian W, Jiang X, Tamosiuniene R, Sung YK, Qian J, Dhillon G, Gera L, Farkas L, Rabinovitch M, Zamanian RT, Inayathullah M, Fridlib M, Rajadas J, Peters-Golden M, Voelkel NF, Nicolls MR. Blocking macrophage leukotriene b4 prevents endothelial injury and reverses pulmonary hypertension. Sci Transl Med 2014; 5:200ra117. [PMID: 23986401 DOI: 10.1126/scitranslmed.3006674] [Citation(s) in RCA: 181] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Pulmonary hypertension (PH) is a serious condition that affects mainly young and middle-aged women, and its etiology is poorly understood. A prominent pathological feature of PH is accumulation of macrophages near the arterioles of the lung. In both clinical tissue and the SU5416 (SU)/athymic rat model of severe PH, we found that the accumulated macrophages expressed high levels of leukotriene A4 hydrolase (LTA4H), the biosynthetic enzyme for leukotriene B4 (LTB4). Moreover, macrophage-derived LTB4 directly induced apoptosis in pulmonary artery endothelial cells (PAECs). Further, LTB4 induced proliferation and hypertrophy of human pulmonary artery smooth muscle cells. We found that LTB4 acted through its receptor, BLT1, to induce PAEC apoptosis by inhibiting the protective endothelial sphingosine kinase 1 (Sphk1)-endothelial nitric oxide synthase (eNOS) pathway. Blocking LTA4H decreased in vivo LTB4 levels, prevented PAEC apoptosis, restored Sphk1-eNOS signaling, and reversed fulminant PH in the SU/athymic rat model of PH. Antagonizing BLT1 similarly reversed established PH. Inhibition of LTB4 biosynthesis or signal transduction in SU-treated athymic rats with established disease also improved cardiac function and reopened obstructed arterioles; this approach was also effective in the monocrotaline model of severe PH. Human plexiform lesions, one hallmark of PH, showed increased numbers of macrophages, which expressed LTA4H, and patients with connective tissue disease-associated pulmonary arterial hypertension exhibited significantly higher LTB4 concentrations in the systemic circulation than did healthy subjects. These results uncover a possible role for macrophage-derived LTB4 in PH pathogenesis and identify a pathway that may be amenable to therapeutic targeting.
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Affiliation(s)
- Wen Tian
- Veterans Affairs Palo Alto Health Care System/Stanford University, Palo Alto, CA 94304, USA
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Markoutsa S, Sürün D, Karas M, Hofmann B, Steinhilber D, Sorg BL. Analysis of 5-lipoxygenase phosphorylation on molecular level by MALDI-MS. FEBS J 2014; 281:1931-47. [DOI: 10.1111/febs.12759] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Stavroula Markoutsa
- Institute of Pharmaceutical Chemistry/ZAFES; Goethe University; Frankfurt am Main Germany
| | - Duran Sürün
- Department of Molecular Hematology; University of Frankfurt Medical School; Germany
| | - Michael Karas
- Institute of Pharmaceutical Chemistry/ZAFES; Goethe University; Frankfurt am Main Germany
| | - Bettina Hofmann
- Institute of Pharmaceutical Chemistry/ZAFES; Goethe University; Frankfurt am Main Germany
| | - Dieter Steinhilber
- Institute of Pharmaceutical Chemistry/ZAFES; Goethe University; Frankfurt am Main Germany
| | - Bernd L. Sorg
- Institute of Pharmaceutical Chemistry/ZAFES; Goethe University; Frankfurt am Main Germany
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31
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Hofmann B, Steinhilber D. 5-Lipoxygenase inhibitors: a review of recent patents (2010-2012). Expert Opin Ther Pat 2013; 23:895-909. [PMID: 23600432 DOI: 10.1517/13543776.2013.791678] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION 5-Lipoxygenase (5-LO) is a crucial enzyme of the arachidonic acid (AA) cascade and catalyzes the formation of bioactive leukotrienes (LTs) with the help of FLAP, the 5-LO-activating protein. LTs are inflammatory mediators playing a pathophysiological role in different diseases like asthma, allergic rhinitis as well as cardiovascular diseases and certain types of cancer. With the rising number of indications for anti-LT therapy, 5-LO inhibitor drug development becomes increasingly important. AREAS COVERED Here, both recent findings regarding the pathophysiological role of 5-LO and the patents claimed for 5-LO inhibitors are discussed. Focusing on direct inhibitors, several patents disclosing FLAP antagonists are also subject of this review. Novel compounds include 1,5-diarylpyrazoles, indolizines and indoles and several natural product extracts. EXPERT OPINION Evaluation of the patent activities revealed only quite moderate action. Nevertheless, several auspicious drug-like molecules were disclosed. It seems that in the near future, FLAP inhibitors can be expected to enter the market for the treatment of asthma. With the resolved structure of 5-LO, structure-based drug design is now applicable. Together with the identification of downstream enzyme inhibitors and dual-targeting drugs within the AA cascade, several tools are at hand to cope with 5-LOs increasing pathophysiological roles.
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Affiliation(s)
- Bettina Hofmann
- Goethe University Frankfurt, Institute of Pharmaceutical Chemistry, Max-von-Laue-Str. 9, 60438, Frankfurt, Germany
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32
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Chaitidis P, Adel S, Anton M, Heydeck D, Kuhn H, Horn T. Lipoxygenase pathways in Homo neanderthalensis: functional comparison with Homo sapiens isoforms. J Lipid Res 2013; 54:1397-409. [PMID: 23475662 DOI: 10.1194/jlr.m035626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Lipoxygenases (LOX) have been implicated in biosynthesis of pro- and anti-inflammatory mediators, and a previous report suggested compromised leukotriene signaling in H. neanderthalensis. To search for corresponding differences in leukotriene biosynthesis, we screened the Neandertal genome for LOX genes and found that, as modern humans, this archaic hominid contains six LOX genes (nALOX15, nALOX12, nALOX5, nALOX15B, nALOX12B, and nALOXE3) and one pseudogene. In the Neandertal genome, 60-75% of the amino acids of the different human LOX isoforms have been identified, and the degree of identity varies between 96 and 99%. Most functional amino acids (iron ligands, specificity determinants, calcium and ATP-binding sites, membrane-binding determinants, and phosphorylation sites) are well conserved in the Neandertal LOX isoforms, and expression of selected neandertalized human LOX mutants revealed no major functional defects. However, in nALOX12 and nALOXE3, two premature stop codons were found, leading to inactive enzyme species. These data suggest that ALOX15, ALOX5, ALOX15B, and ALOX12B should have been present as functional enzymes in H. neanderthalensis and that in contrast to lower nonhuman primates (M. mulatta) and other mammals (mice, rats), this ancient hominid expressed a 15-lipoxygenating ALOX15. Expression of ALOXE3 and ALOX12 was compromised, which might have caused problems in epidermal differentiation.
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Affiliation(s)
- Pavlos Chaitidis
- Institute of Biochemistry, University Medicine Berlin - Charité, 10117 Berlin, Germany
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33
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Gilbert NC, Rui Z, Neau DB, Waight MT, Bartlett SG, Boeglin WE, Brash AR, Newcomer ME. Conversion of human 5-lipoxygenase to a 15-lipoxygenase by a point mutation to mimic phosphorylation at Serine-663. FASEB J 2012; 26:3222-9. [PMID: 22516296 PMCID: PMC3405276 DOI: 10.1096/fj.12-205286] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Accepted: 04/10/2012] [Indexed: 01/09/2023]
Abstract
The enzyme 5-lipoxygenase (5-LOX) initiates biosynthesis of the proinflammatory leukotriene lipid mediators and, together with 15-LOX, is also required for synthesis of the anti-inflammatory lipoxins. The catalytic activity of 5-LOX is regulated through multiple mechanisms, including Ca(2+)-targeted membrane binding and phosphorylation at specific serine residues. To investigate the consequences of phosphorylation at S663, we mutated the residue to the phosphorylation mimic Asp, providing a homogenous preparation suitable for catalytic and structural studies. The S663D enzyme exhibits robust 15-LOX activity, as determined by spectrophotometric and HPLC analyses, with only traces of 5-LOX activity remaining; synthesis of the anti-inflammatory lipoxin A(4) from arachidonic acid is also detected. The crystal structure of the S663D mutant in the absence and presence of arachidonic acid (in the context of the previously reported Stable-5-LOX) reveals substantial remodeling of helices that define the active site so that the once fully encapsulated catalytic machinery is solvent accessible. Our results suggest that phosphorylation of 5-LOX at S663 could not only down-regulate leukotriene synthesis but also stimulate lipoxin production in inflammatory cells that do not express 15-LOX, thus redirecting lipid mediator biosynthesis to the production of proresolving mediators of inflammation.
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Affiliation(s)
- Nathaniel C. Gilbert
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Zhe Rui
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - David B. Neau
- Northeastern Collaborative Access Team, Argonne National Laboratory, Argonne, Illinois, USA; and
| | - Maria T. Waight
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Sue G. Bartlett
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - William E. Boeglin
- Department of Pharmacology and
- Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, Tennessee
| | - Alan R. Brash
- Department of Pharmacology and
- Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, Tennessee
| | - Marcia E. Newcomer
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
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Hofmann B, Rödl CB, Kahnt AS, Maier TJ, Michel AA, Hoffmann M, Rau O, Awwad K, Pellowska M, Wurglics M, Wacker M, Zivković A, Fleming I, Schubert-Zsilavecz M, Stark H, Schneider G, Steinhilber D. Molecular pharmacological profile of a novel thiazolinone-based direct and selective 5-lipoxygenase inhibitor. Br J Pharmacol 2012; 165:2304-13. [PMID: 21955369 DOI: 10.1111/j.1476-5381.2011.01707.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE The potency of many 5-lipoxygenase (5-LOX) inhibitors depends on the cellular peroxide tone and the mechanism of 5-LOX enzyme activation. Therefore, new inhibitors that act regardless of the mode of enzyme activation need to be developed. Recently, we identified a novel class of thiazolinone-based compounds as potent 5-LOX inhibitors. Here, we present the molecular pharmacological profile of (Z)-5-(4-methoxybenzylidene)-2-(p-tolyl)-5H-thiazol-4-one, compound C06. EXPERIMENTAL APPROACH Inhibition of 5-LOX product formation was determined in intact cells [polymorphonuclear leukocytes (PMNL), rat basophilic leukaemia-1, RAW264.7] and in cell-free assays [homogenates, 100, 000×g supernatant (S100), partially purified 5-LOX] applying different stimuli for 5-LOX activation. Inhibition of peroxisome proliferator-activated receptor (PPAR), cytosolic phospholipase A(2) (cPLA(2) ), 12-LOX, 15-LOX-1 and 15-LOX-2 as well as cyclooxygenase-2 (COX-2) were measured in vitro. KEY RESULTS C06 induced non-cytotoxic, direct 5-LOX inhibition with IC(50) values about 0.66 µM (intact PMNL, PMNL homogenates) and approximately 0.3 µM (cell-free PMNL S100, partially purified 5-LOX). Action of C06 was independent of the stimulus used for 5-LOX activation and cellular redox tone and was selective for 5-LOX compared with other arachidonic acid binding proteins (PPAR, cPLA(2) , 12-LOX, 15-LOX-1, 15-LOX-2, COX-2). Experimental results suggest an allosteric binding distinct from the active site and the C2-like domain of 5-LOX. CONCLUSIONS AND IMPLICATIONS C06 was identified as a potent selective direct 5-LOX inhibitor exhibiting a novel and unique mode of action, different from other established 5-LOX inhibitors. This thiazolinone may possess potential for intervention with inflammatory and allergic diseases and certain types of cancer.
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Affiliation(s)
- B Hofmann
- Institute of Pharmaceutical Chemistry, Goethe University, Frankfurt, Germany.
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Haeggström JZ, Funk CD. Lipoxygenase and leukotriene pathways: biochemistry, biology, and roles in disease. Chem Rev 2011; 111:5866-98. [PMID: 21936577 DOI: 10.1021/cr200246d] [Citation(s) in RCA: 609] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jesper Z Haeggström
- Department of Medical Biochemistry and Biophysics, Division of Chemistry 2, Karolinska Institutet, S-171 77 Stockholm, Sweden.
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Loftus JP, Morgan SK, Wakshlag JJ. Cloning and antibody recognition analysis of the canine 5-lipoxygenase gene. Vet Immunol Immunopathol 2011; 142:276-9. [PMID: 21616545 DOI: 10.1016/j.vetimm.2011.05.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Revised: 04/14/2011] [Accepted: 05/02/2011] [Indexed: 10/18/2022]
Abstract
5-Lipoxygenase cDNA was prepared from canine white blood cells revealing the full-length message using an oligonucleotide capping method. The sequenced 5-Lipoxygenase open reading frame revealed a 2031 base pair message encoding a 676 amino acid protein. The amino acid sequence showed mild variation with the presumed canine sequence, as well as differences in important residues of known phosphorylation observed in other species. The sequence had between 86 and 92% homology with other species, revealing a highly conserved sequence. Confirmation of gene product identity was achieved through transient transfection of the gene in a V5-Histidine tagged pcDNA 3.1 vector into a known canine cell line. Both V5 antibody and 5-lipoxygenase antibody confirmed the gene product using Western blotting and immunoflourescence.
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Affiliation(s)
- John P Loftus
- Cornell University College of Veterinary Medicine, Department of Clinical Sciences, Ithaca, NY 14853, United States
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Boudreau LH, Bertin J, Robichaud PP, Laflamme M, Ouellette RJ, Flamand N, Surette ME. Novel 5‐lipoxygenase isoforms affect the biosynthesis of 5‐lipoxygenase products. FASEB J 2010; 25:1097-105. [DOI: 10.1096/fj.10-173856] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Luc H. Boudreau
- Département de Chimie et Biochimie Université de Moncton Moncton New Brunswick Canada
- Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec Departement de Medecine et Faculté de Médecine Université Laval Québec Canada
| | - Jonathan Bertin
- Département de Chimie et Biochimie Université de Moncton Moncton New Brunswick Canada
| | - Philippe P. Robichaud
- Département de Chimie et Biochimie Université de Moncton Moncton New Brunswick Canada
| | - Mark Laflamme
- Atlantic Cancer Research Institute Moncton New Brunswick Canada
- Department of Fisheries and Oceans Canada Moncton New Brunswick Canada
| | | | - Nicolas Flamand
- Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec Departement de Medecine et Faculté de Médecine Université Laval Québec Canada
| | - Marc E. Surette
- Département de Chimie et Biochimie Université de Moncton Moncton New Brunswick Canada
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Rådmark O, Samuelsson B. Regulation of the activity of 5-lipoxygenase, a key enzyme in leukotriene biosynthesis. Biochem Biophys Res Commun 2010; 396:105-10. [PMID: 20494120 DOI: 10.1016/j.bbrc.2010.02.173] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Accepted: 02/28/2010] [Indexed: 01/22/2023]
Abstract
5-Lipoxygenase (5LO) catalyzes two steps in the biosynthesis of leukotrienes (LTs), lipid mediators of inflammation derived from arachidonic acid. LTs function in normal host defense, and have pathophysiological roles in chronic inflammatory diseases as asthma and atherosclerosis. Also, possible effects of 5LO products in relation to tumorigenesis have been described. Thus, insight regarding the biochemistry of 5LO is relevant for better understanding of normal physiology, and for development of therapy.
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Affiliation(s)
- Olof Rådmark
- Department of Medical Biochemistry and Biophysics, Division of Physiological Chemistry II, Karolinska Institutet, 17177 Stockholm, Sweden.
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Newcomer ME, Gilbert NC. Location, location, location: compartmentalization of early events in leukotriene biosynthesis. J Biol Chem 2010; 285:25109-14. [PMID: 20507998 DOI: 10.1074/jbc.r110.125880] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Leukotrienes (LTs), derived from arachidonic acid (AA) released from the membrane by the action of phospholipase A(2), are potent lipid mediators of the inflammatory response. In 1983, Dahlén et al. demonstrated that LTC(4), LTD(4), and LTE(4) mediate antigen-induced constriction of bronchi in tissue obtained from subjects with asthma (Dahlén, S. E., Hansson, G., Hedqvist, P., Björck, T., Granström, E., and Dahlén, B. (1983) Proc. Natl. Acad. Sci. U.S.A. 80, 1712-1716). Over the last 25+ years, substantial progress has been made in understanding how LTs exert their effects, and a broader appreciation for the numerous biological processes they mediate has emerged. LT biosynthesis is initiated by the action of 5-lipoxygenase (5-LOX), which catalyzes the transformation of AA to LTA(4) in a two-step reaction. Ca(2+) targets 5-LOX to the nuclear membrane, where it co-localizes with the 5-LOX-activating protein FLAP and, when present, the downstream enzyme LTC(4) synthase, both transmembrane proteins. Crystal structures of the AA-metabolizing LOXs, LTC(4) synthase, and FLAP combined with biochemical data provide a framework for understanding how subcellular organizations optimize the biosynthesis of these labile hydrophobic signaling compounds, which must navigate pathways that include both membrane and soluble enzymes. The insights these structures afford and the questions they engender are discussed in this minireview.
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Affiliation(s)
- Marcia E Newcomer
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
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Pergola C, Werz O. 5-Lipoxygenase inhibitors: a review of recent developments and patents. Expert Opin Ther Pat 2010; 20:355-75. [DOI: 10.1517/13543771003602012] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Hersberger M. Potential role of the lipoxygenase derived lipid mediators in atherosclerosis: leukotrienes, lipoxins and resolvins. Clin Chem Lab Med 2010; 48:1063-73. [DOI: 10.1515/cclm.2010.212] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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