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Brennan EP, Mohan M, McClelland A, de Gaetano M, Tikellis C, Marai M, Crean D, Dai A, Beuscart O, Derouiche S, Gray SP, Pickering R, Tan SM, Godson-Treacy M, Sheehan S, Dowdall JF, Barry M, Belton O, Ali-Shah ST, Guiry PJ, Jandeleit-Dahm K, Cooper ME, Godson C, Kantharidis P. Lipoxins Protect Against Inflammation in Diabetes-Associated Atherosclerosis. Diabetes 2018; 67:2657-2667. [PMID: 30213823 DOI: 10.2337/db17-1317] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 08/30/2018] [Indexed: 11/13/2022]
Abstract
Increasing evidence points to the fact that defects in the resolution of inflammatory pathways predisposes individuals to the development of chronic inflammatory diseases, including diabetic complications such as accelerated atherosclerosis. The resolution of inflammation is dynamically regulated by the production of endogenous modulators of inflammation, including lipoxin A4 (LXA4). Here, we explored the therapeutic potential of LXA4 and a synthetic LX analog (Benzo-LXA4) to modulate diabetic complications in the streptozotocin-induced diabetic ApoE-/- mouse and in human carotid plaque tissue ex vivo. The development of diabetes-induced aortic plaques and inflammatory responses of aortic tissue, including the expression of vcam-1, mcp-1, il-6, and il-1β, was significantly attenuated by both LXA4 and Benzo-LXA4 in diabetic ApoE-/- mice. Importantly, in mice with established atherosclerosis, treatment with LXs for a 6-week period, initiated 10 weeks after diabetes onset, led to a significant reduction in aortic arch plaque development (19.22 ± 2.01% [diabetic]; 12.67 ± 1.68% [diabetic + LXA4]; 13.19 ± 1.97% [diabetic + Benzo-LXA4]). Secretome profiling of human carotid plaque explants treated with LXs indicated changes to proinflammatory cytokine release, including tumor necrosis factor-α and interleukin-1β. LXs also inhibited platelet-derived growth factor-stimulated vascular smooth muscle cell proliferation and transmigration and endothelial cell inflammation. These data suggest that LXs may have therapeutic potential in the context of diabetes-associated vascular complications.
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Affiliation(s)
- Eoin P Brennan
- UCD Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine, University College Dublin, Dublin, Ireland
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Muthukumar Mohan
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Aaron McClelland
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Monica de Gaetano
- UCD Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine, University College Dublin, Dublin, Ireland
| | - Christos Tikellis
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Mariam Marai
- UCD Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine, University College Dublin, Dublin, Ireland
| | - Daniel Crean
- UCD School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Aozhi Dai
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Ophelie Beuscart
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Sinda Derouiche
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Stephen P Gray
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Raelene Pickering
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Sih Min Tan
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Molly Godson-Treacy
- Department of Vascular Surgery, St. Vincent's University Hospital, Dublin, Ireland
| | - Stephen Sheehan
- Department of Vascular Surgery, St. Vincent's University Hospital, Dublin, Ireland
| | - Joseph F Dowdall
- Department of Vascular Surgery, St. Vincent's University Hospital, Dublin, Ireland
| | - Mary Barry
- Department of Vascular Surgery, St. Vincent's University Hospital, Dublin, Ireland
| | - Orina Belton
- School of Biomolecular and Biomedical Science, University College Dublin, Dublin, Ireland
| | - Syed Tasadaque Ali-Shah
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry and Chemical Biology, University College Dublin, Dublin, Ireland
| | - Patrick J Guiry
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry and Chemical Biology, University College Dublin, Dublin, Ireland
| | - Karin Jandeleit-Dahm
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Mark E Cooper
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Catherine Godson
- UCD Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine, University College Dublin, Dublin, Ireland
| | - Phillip Kantharidis
- JDRF Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker Heart and Diabetes Institute, Melbourne, Australia
- Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
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Sharma A, Sharma HS. Monoclonal antibodies as novel neurotherapeutic agents in CNS injury and repair. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2012; 102:23-45. [PMID: 22748825 DOI: 10.1016/b978-0-12-386986-9.00002-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Central nervous system (CNS) injury is a complex in which numerous neurochemicals and other vasoactive agents actively contribute towards the development of posttraumatic brain pathology and/or repair mechanisms. A focal trauma to the brain or spinal cord releases several endogenous neurodestructive agents within the CNS, resulting in adverse cellular reactions. Our laboratory is engaged in identifying these endogenous neurodestructive signals in the CNS following injury caused by trauma or hyperthermia. Our observations show that serotonin (5-HT), dynorphin A (Dyn A 1-17), nitric oxide synthase (NOS), and tumor necrosis factor-α (TNF-α) could be potential neurodestructive signals in the CNS injury. Thus, neutralization of these agents using monoclonal antibodies directed against 5-HT, NOS, Dyn A (1-17), and TNF-α in vivo will result in marked neuroprotection and enhance neurorepair after trauma. In addition, a suitable combination of monoclonal antibodies, for example, NOS and TNF-α, when applied 60-90 min after trauma, is capable to enhance neuroprotective ability and thwart cell and tissue injury after spinal cord insult. Taken together, our novel observations suggest a potential use of monoclonal antibodies as suitable therapeutic agents in CNS injuries to achieve neuroprotection and/or neurorepair.
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Affiliation(s)
- Aruna Sharma
- Laboratory of Cerebrovascular Research, Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, University Hospital, Uppsala University, Uppsala, Sweden
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Russell R, Gori I, Pellegrini C, Kumar R, Achtari C, Canny GO. Lipoxin A4 is a novel estrogen receptor modulator. FASEB J 2011; 25:4326-37. [PMID: 21885654 DOI: 10.1096/fj.11-187658] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Inflammation is intimately linked with naturally occurring remodeling events in the endometrium. Lipoxins comprise a group of short-lived, nonclassic eicosanoids possessing potent anti-inflammatory and proresolution properties. In the present study, we investigated the role of lipoxin A(4) (LXA(4)) in the endometrium and demonstrated that 15-LOX-2, an enzyme necessary for LX biosynthesis, is expressed in this tissue. Our results establish that LXA(4) possesses robust estrogenic activity through its capacity to alter ERE transcriptional activity, as well as expression of estrogen-regulated genes, alkaline phosphatase activity, and proliferation in human endometrial epithelial cells. Interestingly, LXA(4) also demonstrated antiestrogenic potential, significantly attenuating E2-induced activity. This estrogenic activity was directly mediated through estrogen receptors (ERs). Subsequent investigations determined that the actions of LXA(4) are exclusively mediated through ERα and closely mimic those of the potent estrogen 17β-estradiol (E2). In binding assays, LXA(4) competed with E2 for ER binding, with an IC(50) of 46 nM. Furthermore, LXA(4) exhibited estrogenic activity in vivo, increasing uterine wet weight and modulating E2-regulated gene expression. These findings reveal a previously unappreciated facet of LXA(4) bioactions, implicating this lipid mediator in novel immunoendocrine crosstalk mechanisms.
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Affiliation(s)
- Ronan Russell
- Mucosal Immunity Laboratory, Department of Gynecology, Obstetrics and Medical Genetics, University Hospital Center and University of Lausanne, Ave. Pierre Decker 2, 1011 Lausanne, Switzerland
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Grumbach Y, Quynh NVT, Chiron R, Urbach V. LXA4 stimulates ZO-1 expression and transepithelial electrical resistance in human airway epithelial (16HBE14o-) cells. Am J Physiol Lung Cell Mol Physiol 2008; 296:L101-8. [PMID: 18849442 DOI: 10.1152/ajplung.00018.2008] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Lipoxin A(4) (LXA(4)) is a biologically active eicosanoid produced in human airways that displays anti-inflammatory properties. In cystic fibrosis and severe asthma, LXA(4) production has been reported to be decreased, and, in such diseases, one of the consequences of airway inflammation is disruption of the tight junctions. In the present study, we investigated the possible role of LXA(4) on tight junction formation, using transepithelial electrical resistance (TER) measurements, Western blotting, and immunofluorescence. We observed that exposure to LXA(4) (100 nM) for 2 days significantly increased zonula occludens-1 (ZO-1), claudin-1, and occludin expression at the plasma membrane of confluent human bronchial epithelial 16HBE14o- cells. LXA(4) (100 nM) stimulated the daily increase of the 16HBE14o- cell monolayer TER, and this effect was inhibited by boc-2 (LXA(4) receptor antagonist). LXA(4) also had a rapid effect on ZO-1 immunofluorescence at the plasma membrane and increased TER within 10 min. In conclusion, our experiments provide evidence that LXA(4) plays certainly a new role for the regulation of tight junction formation and stimulation of the localization and expression of ZO-1 at the plasma membrane through a mechanism involving the LXA(4) receptor.
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Affiliation(s)
- Yael Grumbach
- Institut National de la Santé et de la Recherche Médicale U454, Centre Hospitalier Universitaire Arnaud de Villeneuve, Montpellier, France
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Kobayashi T, Takaku Y, Kikuchi I, Soma T, Hagiwara K, Kanazawa M, Nagata M. Eosinophils do not enhance the trans-basement-membrane migration of neutrophils. Int Arch Allergy Immunol 2007; 143 Suppl 1:38-43. [PMID: 17541275 DOI: 10.1159/000101403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND There is increasing evidence that both neutrophilic and eosinophilic inflammation persist in the airways of patients with severe asthma. We have reported a positive relationship between the concentrations of eosinophils and neutrophils in sputum from severe asthmatics, suggesting a possible role of eosinophils in regulating neutrophilic inflammation. The aim of this study was to investigate whether activated eosinophils modify the trans-basement membrane migration (TBM) of neutrophils. METHODS Eosinophils and neutrophils were isolated from peripheral blood drawn from healthy donors. The TBM of neutrophils in response to a variety of chemoattractants was evaluated in the presence or absence of eosinophils by using the chambers with a Matrigel-coated Transwell insert. RESULTS As expected, eotaxin (10 nM) and RANTES (10 nM), but not IL-8 (10 nM), induced the TBM of eosinophils. On the contrary, only IL-8 induced the TBM of neutrophils. When eosinophils were coincubated with neutrophils and stimulated with IL-8, the TBM of eosinophils was significantly augmented. On the other hand, when neutrophils were coincubated with eosinophils and stimulated with eotaxin or RANTES, the TBM of neutrophils was not modified. CONCLUSIONS Neutrophils migrated by IL-8 may lead eosinophils to accumulate in the airways of patients with severe asthma. On the other hand, it is unlikely that eosinophils migrated by chemoattractants such as CC chemokines regulate neutrophilic inflammation.
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Affiliation(s)
- Takehito Kobayashi
- Department of Respiratory Medicine, Saitama Medical University, Iruma-gun, Saitama, Japan
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Sabirsh A, Pettersson A, Boketoft A, Kotarsky K, Owman C. Differential inhibition of receptor activation by two mouse monoclonal antibodies specific for the human leukotriene B4 receptor, BLT1. Int Immunopharmacol 2003; 3:1829-39. [PMID: 14636832 DOI: 10.1016/j.intimp.2003.08.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The inflammatory mediator leukotriene B(4) (LTB(4)) binds to and activates a G-protein-coupled receptor named BLT(1). We have previously produced two monoclonal antibodies, named 7B1 and 14F11, that bind specifically to this receptor. Using a HeLa cell line expressing human BLT(1), we find that both antibodies inhibit LTB(4)-induced calcium release, and activation of a MAP-kinase-sensitive luciferase reporter system. The normal chemotactic movement of polymorphonuclear cells towards higher LTB(4) concentrations was also strongly inhibited by both antibodies. Neither antibody was found to activate BLT(1), and experiments using cyclic peptide fragments of the BLT(1) n-terminal and extracellular loops showed that these antibodies bind only to complex epitopes in the tertiary, membrane bound, conformation of the receptor protein. In ligand binding experiments, 7B1 was found to be a competitive antagonist, while 14F11 was a noncompetitive antagonist that inhibited receptor activation, but not agonist (LTB(4)) binding. 14F11 will be a useful tool for studying the mechanisms of receptor activation.
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Affiliation(s)
- A Sabirsh
- Molecular Neurobiology, Lund University, BMC A12 Tornavägen 10, 224 81 Lund, Sweden.
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Gaudreau R, Le Gouill C, Venne MH, Stankova J, Rola-Pleszczynski M. Threonine 308 within a putative casein kinase 2 site of the cytoplasmic tail of leukotriene B(4) receptor (BLT1) is crucial for ligand-induced, G-protein-coupled receptor-specific kinase 6-mediated desensitization. J Biol Chem 2002; 277:31567-76. [PMID: 12077128 DOI: 10.1074/jbc.m202723200] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Desensitization of G-protein-coupled receptors may involve phosphorylation of serine and threonine residues. The leukotriene B(4) (LTB(4)) receptor (BLT1) contains 14 intracellular serines and threonines, 8 of which are part of consensus target sequences for protein kinase C (PKC) or casein kinase 2. In this study, we investigated the importance of PKC and GPCR-specific kinase (GRK) phosphorylation in BLT1 desensitization. Pretreatment of BLT1-transfected COS-7 cells with PKC activators caused a decrease of LTB(4)-induced inositol phosphate (IP) accumulation. This reduction was prevented with the PKC inhibitor, staurosporine, and not observed in cells expressing a BLT1 deletion mutant (G291stop) lacking the cytoplasmic tail. Moreover LTB(4)-induced IP accumulation was significantly inhibited by overexpression of GRK2, GRK5, and especially GRK6, in cells expressing wild type BLT1 but not in those expressing G291stop. GRK6-mediated desensitization correlated with increased phosphorylation of BLT1. The G319stop truncated BLT1 mutant displayed functional characteristics comparable with wild type BLT1 in terms of desensitization by GRK6, but not by PKC. Substitution of Thr(308) within a putative casein kinase 2 site to proline or alanine in the full-length BLT1 receptor prevented most of GRK6-mediated inhibition of LTB(4)-induced IP production but only partially affected LTB(4)-induced BLT1 phosphorylation. Our findings thus suggest that Thr(308) is a major residue involved in GRK6-mediated desensitization of BLT1 signaling.
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Affiliation(s)
- Remi Gaudreau
- Immunology Division, Department of Pediatrics, Faculty of Medicine, Université de Sherbrooke, Sherbrooke, Quebec J1H 5N4, Canada
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