1
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Ouyang X, Reihill JA, Douglas LEJ, Martin SL. Airborne indoor allergen serine proteases and their contribution to sensitisation and activation of innate immunity in allergic airway disease. Eur Respir Rev 2024; 33:230126. [PMID: 38657996 PMCID: PMC11040391 DOI: 10.1183/16000617.0126-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 02/28/2024] [Indexed: 04/26/2024] Open
Abstract
Common airborne allergens (pollen, animal dander and those from fungi and insects) are the main triggers of type I allergic disorder in the respiratory system and are associated with allergic rhinitis, allergic asthma, as well as immunoglobulin E (IgE)-mediated allergic bronchopulmonary aspergillosis. These allergens promote IgE crosslinking, vasodilation, infiltration of inflammatory cells, mucosal barrier dysfunction, extracellular matrix deposition and smooth muscle spasm, which collectively cause remodelling of the airways. Fungus and insect (house dust mite and cockroaches) indoor allergens are particularly rich in proteases. Indeed, more than 40 different types of aeroallergen proteases, which have both IgE-neutralising and tissue-destructive activities, have been documented in the Allergen Nomenclature database. Of all the inhaled protease allergens, 85% are classed as serine protease activities and include trypsin-like, chymotrypsin-like and collagenolytic serine proteases. In this article, we review and compare the allergenicity and proteolytic effect of allergen serine proteases as listed in the Allergen Nomenclature and MEROPS databases and highlight their contribution to allergic sensitisation, disruption of the epithelial barrier and activation of innate immunity in allergic airways disease. The utility of small-molecule inhibitors of allergen serine proteases as a potential treatment strategy for allergic airways disease will also be discussed.
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Affiliation(s)
- Xuan Ouyang
- School of Pharmacy, Queen's University Belfast, Belfast, UK
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2
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Ouyang X, Reihill JA, Douglas LEJ, Dunne OM, Sergeant GP, Martin SL. House dust mite allergens induce Ca 2+ signalling and alarmin responses in asthma airway epithelial cells. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167079. [PMID: 38367901 DOI: 10.1016/j.bbadis.2024.167079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/15/2024] [Accepted: 02/11/2024] [Indexed: 02/19/2024]
Abstract
Type 2 inflammation in asthma develops with exposure to stimuli to include inhaled allergens from house dust mites (HDM). Features include mucus hypersecretion and the formation of pro-secretory ion transport characterised by elevated basal Cl- current. Studies using human sinonasal epithelial cells treated with HDM extract report a higher protease activated receptor-2 (PAR-2) agonist-induced calcium mobilisation that may be related to airway sensitisation by allergen-associated proteases. Herein, this study aimed to investigate the effect of HDM on Ca2+ signalling and inflammatory responses in asthmatic airway epithelial cells. Primary bronchial epithelial cells (hPBECs) from asthma donors cultured at air-liquid interface were used to assess electrophysiological, Ca2+ signalling and inflammatory responses. Differences were observed regarding Ca2+ signalling in response to PAR-2 agonist 2-Furoyl-LIGRLO-amide (2-FLI), and equivalent short-circuit current (Ieq) in response to trypsin and 2-FLI, in ALI-asthma and healthy hPBECs. HDM treatment led to increased levels of intracellular cations (Ca2+, Na+) and significantly reduced the 2-FLI-induced change of Ieq in asthma cells. Apical HDM-induced Ca2+ mobilisation was found to mainly involve the activation of PAR-2 and PAR-4-associated store-operated Ca2+ influx and TRPV1. In contrast, PAR-2, PAR-4 antagonists and TRPV1 antagonist only showed slight impact on basolateral HDM-induced Ca2+ mobilisation. HDM trypsin-like serine proteases were the main components leading to non-amiloride sensitive Ieq and also increased interleukin-33 (IL-33) and thymic stromal lymphopoietin (TSLP) from asthma hPBECs. These studies add further insight into the complex mechanisms associated with HDM-induced alterations in cell signalling and their relevance to pathological changes within asthma.
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Affiliation(s)
- Xuan Ouyang
- School of Pharmacy, Queen's University Belfast, BT9 7BL, UK
| | | | | | - Orla M Dunne
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, UK
| | - Gerard P Sergeant
- Smooth Muscle Research Centre, Dundalk Institute of Technology, Dublin Road, Dundalk, Co. Louth, Ireland
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3
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Douglas LEJ, Reihill JA, Montgomery BM, Martin SL. Furin as a therapeutic target in cystic fibrosis airways disease. Eur Respir Rev 2023; 32:32/168/220256. [PMID: 37137509 PMCID: PMC10155048 DOI: 10.1183/16000617.0256-2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 02/22/2023] [Indexed: 05/05/2023] Open
Abstract
Clinical management of cystic fibrosis (CF) has been greatly improved by the development of small molecule modulators of the CF transmembrane conductance regulator (CFTR). These drugs help to address some of the basic genetic defects of CFTR; however, no suitable CFTR modulators exist for 10% of people with CF (PWCF). An alternative, mutation-agnostic therapeutic approach is therefore still required. In CF airways, elevated levels of the proprotein convertase furin contribute to the dysregulation of key processes that drive disease pathogenesis. Furin plays a critical role in the proteolytic activation of the epithelial sodium channel; hyperactivity of which causes airways dehydration and loss of effective mucociliary clearance. Furin is also responsible for the processing of transforming growth factor-β, which is increased in bronchoalveolar lavage fluid from PWCF and is associated with neutrophilic inflammation and reduced pulmonary function. Pathogenic substrates of furin include Pseudomonas exotoxin A, a major toxic product associated with Pseudomonas aeruginosa infection and the spike glycoprotein of severe acute respiratory syndrome coronavirus 2, the causative pathogen for coronavirus disease 2019. In this review we discuss the importance of furin substrates in the progression of CF airways disease and highlight selective furin inhibition as a therapeutic strategy to provide clinical benefit to all PWCF.
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Affiliation(s)
- Lisa E J Douglas
- School of Pharmacy, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - James A Reihill
- School of Pharmacy, Queen's University Belfast, Belfast, Northern Ireland, UK
| | | | - S Lorraine Martin
- School of Pharmacy, Queen's University Belfast, Belfast, Northern Ireland, UK
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4
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Ferguson TEG, Reihill JA, Martin SL, Walker B. Novel inhibitors and activity-based probes targeting serine proteases. Front Chem 2022; 10:1006618. [PMID: 36247662 PMCID: PMC9555310 DOI: 10.3389/fchem.2022.1006618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 08/18/2022] [Indexed: 11/13/2022] Open
Abstract
Serine proteases play varied and manifold roles in important biological, physiological, and pathological processes. These include viral, bacterial, and parasitic infection, allergic sensitization, tumor invasion, and metastasis. The use of activity-based profiling has been foundational in pinpointing the precise roles of serine proteases across this myriad of processes. A broad range of serine protease-targeted activity-based probe (ABP) chemotypes have been developed and we have recently introduced biotinylated and "clickable" peptides containing P1 N-alkyl glycine arginine N-hydroxy succinimidyl (NHS) carbamates as ABPs for detection/profiling of trypsin-like serine proteases. This present study provides synthetic details for the preparation of additional examples of this ABP chemotype, which function as potent irreversible inhibitors of their respective target serine protease. We describe their use for the activity-based profiling of a broad range of serine proteases including trypsin, the trypsin-like protease plasmin, chymotrypsin, cathepsin G, and neutrophil elastase (NE), including the profiling of the latter protease in clinical samples obtained from patients with cystic fibrosis.
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Affiliation(s)
| | | | | | - Brian Walker
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Belfast, United Kingdom
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5
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Ferguson TEG, Reihill JA, Martin SL, Walker B. Novel Inhibitors and Activity-Based Probes Targeting Trypsin-Like Serine Proteases. Front Chem 2022; 10:782608. [PMID: 35529696 PMCID: PMC9068901 DOI: 10.3389/fchem.2022.782608] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 04/04/2022] [Indexed: 11/13/2022] Open
Abstract
The trypsin-like proteases (TLPs) play widespread and diverse roles, in a host of physiological and pathological processes including clot dissolution, extracellular matrix remodelling, infection, angiogenesis, wound healing and tumour invasion/metastasis. Moreover, these enzymes are involved in the disruption of normal lung function in a range of respiratory diseases including allergic asthma where several allergenic proteases have been identified. Here, we report the synthesis of a series of peptide derivatives containing an N-alkyl glycine analogue of arginine, bearing differing electrophilic leaving groups (carbamate and triazole urea), and demonstrate their function as potent, irreversible inhibitors of trypsin and TLPs, to include activities from cockroach extract. As such, these inhibitors are suitable for use as activity probes (APs) in activity-based profiling (ABP) applications.
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Affiliation(s)
- Timothy E G Ferguson
- Biomolecular Sciences Research Group, School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
| | - James A Reihill
- Biomolecular Sciences Research Group, School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
| | - S Lorraine Martin
- Biomolecular Sciences Research Group, School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
| | - Brian Walker
- Biomolecular Sciences Research Group, School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
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6
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Douglas LEJ, Reihill JA, Ho MWY, Axten JM, Campobasso N, Schneck JL, Rendina AR, Wilcoxen KM, Martin SL. A highly selective, cell-permeable furin inhibitor BOS-318 rescues key features of cystic fibrosis airway disease. Cell Chem Biol 2022; 29:947-957.e8. [PMID: 35202587 DOI: 10.1016/j.chembiol.2022.02.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 12/14/2021] [Accepted: 02/01/2022] [Indexed: 12/15/2022]
Abstract
In cystic fibrosis (CF), excessive furin activity plays a critical role in the activation of the epithelial sodium channel (ENaC), dysregulation of which contributes to airway dehydration, ineffective mucociliary clearance (MCC), and mucus obstruction. Here, we report a highly selective, cell-permeable furin inhibitor, BOS-318, that derives selectivity by eliciting the formation of a new, unexpected binding pocket independent of the active site catalytic triad. Using human ex vivo models, BOS-318 showed significant suppression of ENaC, which led to enhanced airway hydration and an ∼30-fold increase in MCC rate. Furin inhibition also protected ENaC from subsequent activation by neutrophil elastase, a soluble protease dominant in CF airways. Additional therapeutic benefits include protection against epithelial cell death induced by Pseudomonas aeruginosa exotoxin A. Our findings demonstrate the utility of selective furin inhibition as a mutation-agnostic approach that can correct features of CF airway pathophysiology in a manner expected to deliver therapeutic value.
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Affiliation(s)
- Lisa E J Douglas
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - James A Reihill
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Melisa W Y Ho
- GlaxoSmithKline Research and Development, Collegeville, PA 19426, USA
| | - Jeffrey M Axten
- GlaxoSmithKline Research and Development, Collegeville, PA 19426, USA
| | - Nino Campobasso
- GlaxoSmithKline Research and Development, Collegeville, PA 19426, USA
| | - Jessica L Schneck
- GlaxoSmithKline Research and Development, Collegeville, PA 19426, USA
| | - Alan R Rendina
- GlaxoSmithKline Research and Development, Collegeville, PA 19426, USA
| | | | - S Lorraine Martin
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK.
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7
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Carroll EL, Bailo M, Reihill JA, Crilly A, Lockhart JC, Litherland GJ, Lundy FT, McGarvey LP, Hollywood MA, Martin SL. Trypsin-Like Proteases and Their Role in Muco-Obstructive Lung Diseases. Int J Mol Sci 2021; 22:5817. [PMID: 34072295 PMCID: PMC8199346 DOI: 10.3390/ijms22115817] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/25/2021] [Accepted: 05/26/2021] [Indexed: 12/20/2022] Open
Abstract
Trypsin-like proteases (TLPs) belong to a family of serine enzymes with primary substrate specificities for the basic residues, lysine and arginine, in the P1 position. Whilst initially perceived as soluble enzymes that are extracellularly secreted, a number of novel TLPs that are anchored in the cell membrane have since been discovered. Muco-obstructive lung diseases (MucOLDs) are characterised by the accumulation of hyper-concentrated mucus in the small airways, leading to persistent inflammation, infection and dysregulated protease activity. Although neutrophilic serine proteases, particularly neutrophil elastase, have been implicated in the propagation of inflammation and local tissue destruction, it is likely that the serine TLPs also contribute to various disease-relevant processes given the roles that a number of these enzymes play in the activation of both the epithelial sodium channel (ENaC) and protease-activated receptor 2 (PAR2). More recently, significant attention has focused on the activation of viruses such as SARS-CoV-2 by host TLPs. The purpose of this review was to highlight key TLPs linked to the activation of ENaC and PAR2 and their association with airway dehydration and inflammatory signalling pathways, respectively. The role of TLPs in viral infectivity will also be discussed in the context of the inhibition of TLP activities and the potential of these proteases as therapeutic targets.
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Affiliation(s)
- Emma L. Carroll
- School of Pharmacy, Queen’s University, Belfast BT9 7BL, UK; (E.L.C.); (J.A.R.)
| | - Mariarca Bailo
- Institute for Biomedical and Environmental Health Research, School of Health and Life Sciences, University of the West of Scotland, Paisley PA1 2BE, UK; (M.B.); (A.C.); (J.C.L.); (G.J.L.)
| | - James A. Reihill
- School of Pharmacy, Queen’s University, Belfast BT9 7BL, UK; (E.L.C.); (J.A.R.)
| | - Anne Crilly
- Institute for Biomedical and Environmental Health Research, School of Health and Life Sciences, University of the West of Scotland, Paisley PA1 2BE, UK; (M.B.); (A.C.); (J.C.L.); (G.J.L.)
| | - John C. Lockhart
- Institute for Biomedical and Environmental Health Research, School of Health and Life Sciences, University of the West of Scotland, Paisley PA1 2BE, UK; (M.B.); (A.C.); (J.C.L.); (G.J.L.)
| | - Gary J. Litherland
- Institute for Biomedical and Environmental Health Research, School of Health and Life Sciences, University of the West of Scotland, Paisley PA1 2BE, UK; (M.B.); (A.C.); (J.C.L.); (G.J.L.)
| | - Fionnuala T. Lundy
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University, Belfast BT9 7BL, UK; (F.T.L.); (L.P.M.)
| | - Lorcan P. McGarvey
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University, Belfast BT9 7BL, UK; (F.T.L.); (L.P.M.)
| | - Mark A. Hollywood
- Smooth Muscle Research Centre, Dundalk Institute of Technology, A91 HRK2 Dundalk, Ireland;
| | - S. Lorraine Martin
- School of Pharmacy, Queen’s University, Belfast BT9 7BL, UK; (E.L.C.); (J.A.R.)
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8
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Reihill JA, Douglas LEJ, Martin SL. Modulation of Ion Transport to Restore Airway Hydration in Cystic Fibrosis. Genes (Basel) 2021; 12:genes12030453. [PMID: 33810137 PMCID: PMC8004921 DOI: 10.3390/genes12030453] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/11/2021] [Accepted: 03/19/2021] [Indexed: 12/11/2022] Open
Abstract
Cystic fibrosis (CF) is a life-limiting genetic disorder caused by loss-of-function mutations in the gene which codes for the CF transmembrane conductance regulator (CFTR) Cl- channel. Loss of Cl- secretion across the apical membrane of airway lining epithelial cells results in dehydration of the airway surface liquid (ASL) layer which impairs mucociliary clearance (MCC), and as a consequence promotes bacterial infection and inflammation of the airways. Interventions that restore airway hydration are known to improve MCC. Here we review the ion channels present at the luminal surface of airway epithelial cells that may be targeted to improve airway hydration and MCC in CF airways.
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9
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Short B, Carson S, Devlin AC, Reihill JA, Crilly A, MacKay W, Ramage G, Williams C, Lundy FT, McGarvey LP, Thornbury KD, Martin SL. Non-typeable Haemophilus influenzae chronic colonization in chronic obstructive pulmonary disease (COPD). Crit Rev Microbiol 2021; 47:192-205. [PMID: 33455514 DOI: 10.1080/1040841x.2020.1863330] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Haemophilus influenzae is the most common cause of bacterial infection in the lungs of chronic obstructive pulmonary disease (COPD) patients and contributes to episodes of acute exacerbation which are associated with increased hospitalization and mortality. Due to the ability of H. influenzae to adhere to host epithelial cells, initial colonization of the lower airways can progress to a persistent infection and biofilm formation. This is characterized by changes in bacterial behaviour such as reduced cellular metabolism and the production of an obstructive extracellular matrix (ECM). Herein we discuss the multiple mechanisms by which H. influenzae contributes to the pathogenesis of COPD. In particular, mechanisms that facilitate bacterial adherence to host airway epithelial cells, biofilm formation, and microbial persistence through immune system evasion and antibiotic tolerance will be discussed.
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Affiliation(s)
- Bryn Short
- University of the West of Scotland, Paisley, United Kingdom
| | - Stephen Carson
- School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
| | - Anna-Claire Devlin
- Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom
| | - James A Reihill
- School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
| | - Anne Crilly
- University of the West of Scotland, Paisley, United Kingdom
| | - William MacKay
- University of the West of Scotland, Paisley, United Kingdom
| | - Gordon Ramage
- Glasgow Biofilm Research Group, Oral Sciences, School of Medicine, Dentistry and Nursing, University of Glasgow, Glasgow, United Kingdom
| | - Craig Williams
- University of the West of Scotland, Paisley, United Kingdom
| | - Fionnuala T Lundy
- Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom
| | - Lorcan P McGarvey
- Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom
| | - Keith D Thornbury
- Smooth Muscle Research Group, Dundalk Institute of Technology, Dundalk, Ireland
| | - S Lorraine Martin
- School of Pharmacy, Queen's University Belfast, Belfast, United Kingdom
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10
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Affiliation(s)
- S Lorraine Martin
- School of PharmacyQueen's University BelfastBelfast, Northern Ireland
| | - James A Reihill
- School of PharmacyQueen's University BelfastBelfast, Northern Ireland
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11
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Reihill JA, Ouyang X, Yang Z, Douglas LEJ, Zhou M, Chen T, Martin SL. A Novel Serine Protease Inhibitor PE-BBI Ameliorates Cockroach Extract-Mediated Airway Epithelial Barrier Dysfunction. Biomolecules 2020; 10:biom10040515. [PMID: 32231120 PMCID: PMC7226075 DOI: 10.3390/biom10040515] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/26/2020] [Accepted: 03/27/2020] [Indexed: 01/17/2023] Open
Abstract
Epithelial barrier dysfunction, characteristic of allergic airway disease may be, at least in part, due to the action of allergen-associated protease activities. Cockroach allergy is a major global health issue, with cockroaches containing considerable serine trypsin-like protease (TLP) activity. The present study sought to evaluate two novel protease inhibitors (PE-BBI and pLR-HL), recently isolated from amphibian skin secretions, for their potential to neutralise cockroach TLP activity and to determine any protective effect on cockroach-induced airway epithelial barrier disruption. Inhibitor potencies against the cockroach-associated activities were determined using a fluorogenic peptide substrate-based activity assay. 16HBE14o- cells (16HBE; a bronchial epithelial cell line) were treated with cockroach extract (CRE) in the presence or absence of the compounds in order to assess cell viability (RealTime Glo luminescent assay) and epithelial barrier disruption (transepithelial resistance and paracellular dextran flux). PE-BBI potently and selectively inhibited CRE TLP activity (pIC50 -8), but not host (16HBE) cell surface activity, which conferred protection of 16HBE cells from CRE-induced cell damage and barrier disruption. Novel protease inhibitor strategies such as PE-BBI may be useful for the treatment of allergic airway disease caused by cockroach proteases.
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12
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Douglas LE, Reihill JA, Ho MW, Axten JM, Martin SL. Furin Inhibition as a Mechanism to Reduce Aberrant ENaC‐Mediated Sodium Transport and Rehydrate the Airways in Cystic Fibrosis Lung Disease. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.802.26] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - James A. Reihill
- School of PharmacyQueen's University BelfastBelfastUnited Kingdom
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13
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Carroll EL, Douglas LE, Reihill JA, Zhou M, Chen T, McGarvey LP, Lundy FT, Hollywood MA, Lockhart JC, Martin SL. Inhibition of ENaC Activity by Novel Peptide Trypsin‐Like Inhibitors Derived from Amphibian Skin Secretions. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.127.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emma L. Carroll
- School of PharmacyQueen's University BelfastBelfastUnited Kingdom
| | | | - James A. Reihill
- School of PharmacyQueen's University BelfastBelfastUnited Kingdom
| | - Mei Zhou
- School of PharmacyQueen's University BelfastBelfastUnited Kingdom
| | - Tianbao Chen
- School of PharmacyQueen's University BelfastBelfastUnited Kingdom
| | | | | | - Mark A. Hollywood
- Smooth Muscle Research CentreDundalk Institute of TechnologyDundalkIreland
| | - John C. Lockhart
- Institute of Biomedical & Environmental Health ResearchUniversity of the West of ScotlandScotlandUnited Kingdom
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14
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Carson SA, Reihill JA, Fulton CR, McGarvey LP, Lundy FT, Crilly A, Thornbury KD. Healthy Primary Epithelial Cells Show an Elevated Inflammatory Response to Bacterial Stimulus Compared to COPD Cells. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.127.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Stephen A Carson
- School of Pharmacy, Dentistry and Biomedical Science, The Queen's University of BelfastBelfastUnited Kingdom
| | - James A Reihill
- School of Pharmacy, Dentistry and Biomedical Science, The Queen's University of BelfastBelfastUnited Kingdom
| | - Catherine R Fulton
- School of Medicine, Dentistry and Biomedical Science, The Queen's University of BelfastBelfastUnited Kingdom
| | - Lorcan P McGarvey
- School of Medicine, Dentistry and Biomedical Science, The Queen's University of BelfastBelfastUnited Kingdom
| | - Fionnuala T Lundy
- School of Medicine, Dentistry and Biomedical Science, The Queen's University of BelfastBelfastUnited Kingdom
| | - Anne Crilly
- Centre for Musculoskeletal ScienceThe University of the West of ScotlandPaisleyUnited Kingdom
| | - Keith D Thornbury
- Smooth Muscle Reseach CentreDundalk Institute of TechnologyDundalkIreland
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15
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Kelly GA, Douglas LE, Maye JR, Reihill JA, McGarvey LP, Lundy FT, Litherland G, Martin SL. The Secretory Profile of Inflammatory Mediators is Altered in Differentiated Primary COPD Samples at Air Liquid Interface Compared to Healthy Equivalents. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.127.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gillian A. Kelly
- School of Pharmacy, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - Lisa E.J. Douglas
- School of Pharmacy, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - Jessica R. Maye
- School of Pharmacy, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - James A. Reihill
- School of Pharmacy, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - Lorcan P. McGarvey
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - Fionnuala T. Lundy
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
| | - Gary Litherland
- Institute of Biomedical and Environmental Health Research, Health and Life Science, University of the West of ScotlandScotlandUnited Kingdom
| | - S. Lorraine Martin
- School of Pharmacy, Dentistry and Biomedical Sciences, Queen's University BelfastBelfastUnited Kingdom
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16
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Reihill JA, Walker B, Hamilton RA, Ferguson TEG, Elborn JS, Stutts MJ, Harvey BJ, Saint-Criq V, Hendrick SM, Martin SL. Inhibition of Protease-Epithelial Sodium Channel Signaling Improves Mucociliary Function in Cystic Fibrosis Airways. Am J Respir Crit Care Med 2017; 194:701-10. [PMID: 27014936 DOI: 10.1164/rccm.201511-2216oc] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE In cystic fibrosis (CF) a reduction in airway surface liquid (ASL) height compromises mucociliary clearance, favoring mucus plugging and chronic bacterial infection. Inhibitors of the epithelial sodium channel (ENaC) have therapeutic potential in CF airways to reduce hyperstimulated sodium and fluid absorption to levels that can restore airway hydration. OBJECTIVES To determine whether a novel compound (QUB-TL1) designed to inhibit protease/ENaC signaling in CF airways restores ASL volume and mucociliary function. METHODS Protease activity was measured using fluorogenic activity assays. Differentiated primary airway epithelial cell cultures (F508del homozygotes) were used to determined ENaC activity (Ussing chamber recordings), ASL height (confocal microscopy), and mucociliary function (by tracking the surface flow of apically applied microbeads). Cell toxicity was measured using a lactate dehydrogenase assay. MEASUREMENTS AND MAIN RESULTS QUB-TL1 inhibits extracellularly located channel activating proteases (CAPs), including prostasin, matriptase, and furin, the activities of which are observed at excessive levels at the apical surface of CF airway epithelial cells. QUB-TL1-mediated CAP inhibition results in diminished ENaC-mediated Na(+) absorption in CF airway epithelial cells caused by internalization of a prominent pool of cleaved (active) ENaCγ from the cell surface. Importantly, diminished ENaC activity correlates with improved airway hydration status and mucociliary clearance. We further demonstrate QUB-TL1-mediated furin inhibition, which is in contrast to other serine protease inhibitors (camostat mesylate and aprotinin), affords protection against neutrophil elastase-mediated ENaC activation and Pseudomonas aeruginosa exotoxin A-induced cell death. CONCLUSIONS QUB-TL1 corrects aberrant CAP activities, providing a mechanism to delay or prevent the development of CF lung disease in a manner independent of CF transmembrane conductance regulator mutation.
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Affiliation(s)
- James A Reihill
- 1 Biomolecular Sciences Research Group, School of Pharmacy, and
| | - Brian Walker
- 1 Biomolecular Sciences Research Group, School of Pharmacy, and
| | | | | | - J Stuart Elborn
- 2 School of Medicine, Dentistry & Biomedical Sciences, Queen's University, Belfast, Northern Ireland, United Kingdom
| | - M Jackson Stutts
- 3 Marsico Lung Institute and Cystic Fibrosis Center, University of North Carolina, Chapel Hill, North Carolina; and
| | - Brian J Harvey
- 4 Department of Molecular Medicine, Royal College of Surgeons in Ireland, RCSI-ERC Beaumont Hospital, Dublin, Ireland
| | - Vinciane Saint-Criq
- 4 Department of Molecular Medicine, Royal College of Surgeons in Ireland, RCSI-ERC Beaumont Hospital, Dublin, Ireland
| | - Siobhan M Hendrick
- 4 Department of Molecular Medicine, Royal College of Surgeons in Ireland, RCSI-ERC Beaumont Hospital, Dublin, Ireland
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Reihill JA, Moffitt KL, Jones AM, Elborn JS, Martin SL. P91 Trypsin-like protease activity predicts disease severity and patient mortality in adults with cystic fibrosis. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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18
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Reihill JA, Moreland M, Jarvis GE, McDowell A, Einarsson GG, Elborn JS, Martin SL. Bacterial proteases and haemostasis dysregulation in the CF lung. J Cyst Fibros 2016; 16:49-57. [PMID: 27839953 DOI: 10.1016/j.jcf.2016.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 09/13/2016] [Accepted: 10/10/2016] [Indexed: 01/21/2023]
Abstract
BACKGROUND Pathogenic bacteria which chronically colonise the cystic fibrosis (CF) lung produce a number of virulence determinants, including distinct proteolytic activities. The potential role bacterial proteases play on haemostatic dysregulation within the CF lung is, however, poorly defined, despite haemoptysis being a common complication in CF. METHODS The potential impact of known CF pathogens (Pseudomonas aeruginosa and Burkholderia cepacia complex spp.) on haemostasis was examined for their ability to degrade fibrinogen and dysregulate fibrin clot formation and platelet aggregation. RESULTS Results demonstrate that key CF pathogens growing as a biofilm on mucin exhibit considerable fibrinogenolytic activity, resulting in fibrinogen breakdown, impaired clot formation, and modulation of platelet aggregation. Human neutrophil elastase may also contribute to fibrinogen breakdown and dysregulated clot formation at high concentration. CONCLUSION Bacterial-derived proteases may play an important role in the dysregulation of airway haemostasis, and potentially contribute to episodes of haemoptysis within the CF lung.
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Affiliation(s)
- James A Reihill
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom
| | - Michelle Moreland
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom
| | - Gavin E Jarvis
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom; Department of Physiology, Development and Neuroscience, Selwyn College, University of Cambridge, CB2 3DY, United Kingdom
| | - Andrew McDowell
- Centre for Infection and Immunity, Queen's University Belfast, Belfast BT9 7BL, United Kingdom; Northern Ireland Centre for Stratified Medicine, Biomedical Sciences Research Institute, C-TRIC Building, Altnagelvin Area Hospital, University of Ulster, Londonderry, BT47 6SB, United Kingdom
| | - Gisli G Einarsson
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom
| | - J Stuart Elborn
- Centre for Infection and Immunity, Queen's University Belfast, Belfast BT9 7BL, United Kingdom
| | - S Lorraine Martin
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom.
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Ferguson TEG, Reihill JA, Walker B, Hamilton RA, Martin SL. A Selective Irreversible Inhibitor of Furin Does Not Prevent Pseudomonas Aeruginosa Exotoxin A-Induced Airway Epithelial Cytotoxicity. PLoS One 2016; 11:e0159868. [PMID: 27459298 PMCID: PMC4961418 DOI: 10.1371/journal.pone.0159868] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 07/08/2016] [Indexed: 11/19/2022] Open
Abstract
Many bacterial and viral pathogens (or their toxins), including Pseudomonas aeruginosa exotoxin A, require processing by host pro-protein convertases such as furin to cause disease. We report the development of a novel irreversible inhibitor of furin (QUB-F1) consisting of a diphenyl phosphonate electrophilic warhead coupled with a substrate-like peptide (RVKR), that also includes a biotin tag, to facilitate activity-based profiling/visualisation. QUB-F1 displays greater selectivity for furin, in comparison to a widely used exemplar compound (furin I) which has a chloromethylketone warhead coupled to RVKR, when tested against the serine trypsin-like proteases (trypsin, prostasin and matriptase), factor Xa and the cysteine protease cathepsin B. We demonstrate QUB-F1 does not prevent P. aeruginosa exotoxin A-induced airway epithelial cell toxicity; in contrast to furin I, despite inhibiting cell surface furin-like activity to a similar degree. This finding indicates additional proteases, which are sensitive to the more broad-spectrum furin I compound, may be involved in this process.
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Affiliation(s)
- Timothy E. G. Ferguson
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Northern Ireland, United Kingdom
| | - James A. Reihill
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Northern Ireland, United Kingdom
| | - Brian Walker
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Northern Ireland, United Kingdom
| | - Robert A. Hamilton
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Northern Ireland, United Kingdom
| | - S. Lorraine Martin
- Biomolecular Sciences Research Group, School of Pharmacy, Queen’s University Belfast, Northern Ireland, United Kingdom
- * E-mail:
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20
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Reihill JA, Malcomson B, Bertelsen A, Cheung S, Czerwiec A, Barsden R, Elborn JS, Dürkop H, Hirsch B, Ennis M, Kelly C, Schock BC. Induction of the inflammatory regulator A20 by gibberellic acid in airway epithelial cells. Br J Pharmacol 2015; 173:778-89. [PMID: 26013851 DOI: 10.1111/bph.13200] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Revised: 05/12/2015] [Accepted: 05/14/2015] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE NF-κB-driven inflammation is negatively regulated by the zinc finger protein A20. Gibberellic acid (GA3 ) is a plant-derived diterpenoid with documented anti-inflammatory activity, which is reported to induce A20-like zinc finger proteins in plants. Here, we sought to investigate the anti-inflammatory effect of GA3 in airway epithelial cells and determine if the anti-inflammatory action relates to A20 induction. EXPERIMENTAL APPROACH Primary nasal epithelial cells and a human bronchial epithelial cell line (16HBE14o-) were used. Cells were pre-incubated with GA3 , stimulated with Pseudomonas aeruginosa LPS; IL-6 and IL-8 release, A20, NF-κB and IκBα expression were then evaluated. To determine if any observed anti-inflammatory effect occurred via an A20-dependent mechanism, A20 was silenced using siRNA. KEY RESULTS Cells pre-incubated with GA3 had significantly increased levels of A20 mRNA (4 h) and protein (24 h), resulting in a significant reduction in IL-6 and IL-8 release. This effect was mediated via reduced IκBα degradation and reduced NF-κB (p65) expression. Furthermore, the anti-inflammatory action of GA3 was abolished in A20-silenced cells. CONCLUSIONS AND IMPLICATIONS We showed that A20 induction by GA3 attenuates inflammation in airway epithelial cells, at least in part through its effect on NF-κB and IκBα. GA3 or gibberellin-derived derivatives could potentially be developed into anti-inflammatory drugs for the treatment of chronic inflammatory diseases associated with A20 dysfunction.
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Affiliation(s)
- J A Reihill
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - B Malcomson
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - A Bertelsen
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - S Cheung
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - A Czerwiec
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - R Barsden
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - J S Elborn
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - H Dürkop
- Institute für Pathodiagnostik, Berlin, Germany
| | - B Hirsch
- Charité-University, Institute of Pathology, Berlin, Germany
| | - M Ennis
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
| | - C Kelly
- Northern Ireland Centre for Stratified Medicine, University of Ulster, Londonderry, UK
| | - B C Schock
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
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21
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Reihill JA, Moore JE, Elborn JS, Ennis M. Effect of Aspergillus fumigatus and Candida albicans on pro-inflammatory response in cystic fibrosis epithelium. J Cyst Fibros 2011; 10:401-6. [PMID: 21745765 DOI: 10.1016/j.jcf.2011.06.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 06/16/2011] [Accepted: 06/16/2011] [Indexed: 10/18/2022]
Abstract
BACKGROUND The identification of filamentous fungi and/or yeasts in the airway secretions of individuals with cystic fibrosis (CF) is becoming increasingly prevalent; yet the importance of these organisms in relation to underlying inflammation is poorly defined. METHODS Cystic fibrosis bronchial epithelial cells (CFBE) and human bronchial epithelial cells (HBE) were co-incubated with Candida albicans whole cells or Aspergillus fumigatus conidia for 24 h prior to the measurement of pro-inflammatory cytokines IL-6 and IL-8 by ELISA. RESULTS Treatment of HBE or CFBE with C. albicans whole cells did not alter cytokine secretion. However treatment of CFBE with A. fumigatus conidia resulted in a 1.45-fold increase in IL-6 and a 1.65-fold increase in IL-8 secretion in comparison to basal levels; in contrast there was far less secretion from HBE cells. CONCLUSION Our data indicate that A. fumigatus infection modulates a pro-inflammatory response in CF epithelial cells while C. albicans does not.
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Affiliation(s)
- James A Reihill
- Respiratory Medicine Research Group, Centre for Infection and Immunity, Queens University Belfast, Health Sciences Building, 97 Lisburn Road, Belfast, Northern Ireland, BT9 7BL, UK
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22
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Reihill JA, Ewart MA, Salt IP. The role of AMP-activated protein kinase in the functional effects of vascular endothelial growth factor-A and -B in human aortic endothelial cells. Vasc Cell 2011; 3:9. [PMID: 21507243 PMCID: PMC3094250 DOI: 10.1186/2045-824x-3-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 04/20/2011] [Indexed: 02/08/2023] Open
Abstract
Background Vascular endothelial growth factors (VEGFs) are key regulators of endothelial cell function and angiogenesis. We and others have previously demonstrated that VEGF-A stimulates AMP-activated protein kinase (AMPK) in cultured endothelial cells. Furthermore, AMPK has been reported to regulate VEGF-mediated angiogenesis. The role of AMPK in the function of VEGF-B remains undetermined, as does the role of AMPK in VEGF-stimulated endothelial cell proliferation, a critical process in angiogenesis. Methods Human aortic endothelial cells (HAECs) were incubated with VEGF-A and VEGF-B prior to examination of HAEC AMPK activity, proliferation, migration, fatty acid oxidation and fatty acid transport. The role of AMPK in the functional effects of VEGF-A and/or VEGF-B was assessed after downregulation of AMPK activity with chemical inhibitors or infection with adenoviruses expressing a dominant negative mutant AMPK. Results Incubation of HAECs with VEGF-B rapidly stimulated AMPK activity in a manner sensitive to an inhibitor of Ca2+/calmodulin-dependent kinase kinase (CaMKK), without increasing phosphorylation of endothelial NO synthase (eNOS) phosphorylation at Ser1177. Downregulation of AMPK abrogated HAEC proliferation in response to VEGF-A or VEGF-B. However, activation of AMPK by agents other than VEGF inhibited proliferation. Downregulation of AMPK abrogated VEGF-A-stimulated HAEC migration, whereas infection with adenoviruses expressing constitutively active mutant AMPK stimulated chemokinesis. Neither VEGF-A nor VEGF-B had any significant effect on HAEC fatty acid oxidation, yet prolonged incubation with VEGF-A stimulated fatty acid uptake in an AMPK-dependent manner. Inhibition of eNOS abrogated VEGF-mediated proliferation and migration, but was without effect on VEGF-stimulated fatty acid transport, ERK or Akt phosphorylation. Conclusions These data suggest that VEGF-B stimulates AMPK by a CaMKK-dependent mechanism and stimulation of AMPK activity is required for proliferation in response to either VEGF-A or VEGF-B and migration in response to VEGF-A. AMPK activation alone was not sufficient, however, to stimulate proliferation in the absence of VEGF. VEGF-stimulated NO synthesis is required for the stimulation of proliferation by VEGF-A or VEGF-B, yet this may be independent of eNOS Ser1177 phosphorylation.
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Affiliation(s)
- James A Reihill
- Institute of Cardiovascular & Medical Sciences, College of Medicine, Veterinary & Life Sciences, University of Glasgow, Glasgow UK.
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23
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Boyle JG, Logan PJ, Ewart MA, Reihill JA, Ritchie SA, Connell JMC, Cleland SJ, Salt IP. Rosiglitazone stimulates nitric oxide synthesis in human aortic endothelial cells via AMP-activated protein kinase. J Biol Chem 2008; 283:11210-7. [PMID: 18303014 DOI: 10.1074/jbc.m710048200] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The thiazolidinedione anti-diabetic drugs increase activation of endothelial nitric-oxide (NO) synthase by phosphorylation at Ser-1177 and increase NO bioavailability, yet the molecular mechanisms that underlie this remain poorly characterized. Several protein kinases, including AMP-activated protein kinase, have been demonstrated to phosphorylate endothelial NO synthase at Ser-1177. In the current study we determined the role of AMP-activated protein kinase in rosiglitazone-stimulated NO synthesis. Stimulation of human aortic endothelial cells with rosiglitazone resulted in the time- and dose-dependent stimulation of AMP-activated protein kinase activity and NO production with concomitant phosphorylation of endothelial NO synthase at Ser-1177. Rosiglitazone stimulated an increase in the ADP/ATP ratio in endothelial cells, and LKB1 was essential for rosiglitazone-stimulated AMPK activity in HeLa cells. Infection of endothelial cells with a virus encoding a dominant negative AMP-activated protein kinase mutant abrogated rosiglitazone-stimulated Ser-1177 phosphorylation and NO production. Furthermore, the stimulation of AMP-activated protein kinase and NO synthesis by rosiglitazone was unaffected by the peroxisome proliferator-activated receptor-gamma inhibitor GW9662. These studies demonstrate that rosiglitazone is able to acutely stimulate NO synthesis in cultured endothelial cells by an AMP-activated protein kinase-dependent mechanism, likely to be mediated by LKB1.
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Affiliation(s)
- James G Boyle
- The Henry Wellcome Laboratory for Cell Biology, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, UK
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Reihill JA, Ewart MA, Hardie DG, Salt IP. AMP-activated protein kinase mediates VEGF-stimulated endothelial NO production. Biochem Biophys Res Commun 2007; 354:1084-8. [PMID: 17276402 PMCID: PMC1828119 DOI: 10.1016/j.bbrc.2007.01.110] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2007] [Accepted: 01/21/2007] [Indexed: 11/22/2022]
Abstract
Vascular endothelial growth factor (VEGF) is an important regulator of endothelial cell function. VEGF stimulates NO production, proposed to be a result of phosphorylation and activation of endothelial NO synthase (eNOS) at Ser1177. Phosphorylation of eNOS at this site also occurs after activation of AMP-activated protein kinase (AMPK) in cultured endothelial cells. We therefore determined whether AMPK mediates VEGF-stimulated NO synthesis in endothelial cells. VEGF caused a rapid, dose-dependent stimulation of AMPK activity, with a concomitant increase in phosphorylation of eNOS at Ser1177. Infection of endothelial cells with an adenovirus expressing a dominant negative mutant AMPK partially inhibited both VEGF-stimulated eNOS Ser1177 phosphorylation and NO production. VEGF-stimulated AMPK activity was completely inhibited by the Ca2+/calmodulin-dependent protein kinase kinase inhibitor, STO-609. Stimulation of AMPK via Ca2+/calmodulin-dependent protein kinase kinase represents a novel signalling mechanism utilised by VEGF in endothelial cells that contributes to eNOS phosphorylation and NO production.
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Affiliation(s)
- James A. Reihill
- Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - Marie-Ann Ewart
- Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - D. Grahame Hardie
- Division of Molecular Physiology, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Ian P. Salt
- Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK
- Corresponding author. Fax: +44 141 3304620.
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25
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Sergeant GP, Ohya S, Reihill JA, Perrino BA, Amberg GC, Imaizumi Y, Horowitz B, Sanders KM, Koh SD. Regulation of Kv4.3 currents by Ca2+/calmodulin-dependent protein kinase II. Am J Physiol Cell Physiol 2005; 288:C304-13. [PMID: 15456698 DOI: 10.1152/ajpcell.00293.2004] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The voltage-dependent K+channel 4.3 (Kv4.3) is one of the major molecular correlates encoding a class of rapidly inactivating K+currents, including the transient outward current in the heart ( Ito) and A currents ( IA) in neuronal and smooth muscle preparations. Recent studies have shown that Itoin human atrial myocytes and IAin murine colonic myocytes are modulated by Ca2+/calmodulin-dependent protein kinase II (CaMKII); however, the molecular target of CaMKII in these studies has not been elucidated. We performed experiments to investigate whether CaMKII could regulate Kv4.3 currents directly. Inclusion of the autothiophosphorylated form of CaMKII in the patch pipette (10 nM) prolonged Kv4.3 currents such that the time required to reach 50% inactivation from peak more than doubled, with positive shifts in voltage dependence of both activation and inactivation. In contrast, the rate of recovery from inactivation was accelerated under these conditions. CaMKII-inhibitory peptide or KN-93 produced effects opposite to that above; thus the rate of inactivation was increased, and recovery from inactivation decreased. A number of mutagenesis experiments were conducted on the three candidate CaMKII consensus sequence sites on the channel. Mutations at S550A, located at the COOH-terminal region of the channel, resulted in currents that inactivated more rapidly but recovered from inactivation at a slower rate than that of wild-type controls. In addition, these currents were unaffected by dialysis with either autothiophosphorylated CaMKII or the specific inhibitory peptide of CaMKII, suggesting that CaMKII slows the inactivation and accelerates the rate of recovery from inactivation of Kv4.3 currents by a direct effect at S550A, located at the COOH-terminal region of the channel.
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Affiliation(s)
- Gerard P Sergeant
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada 89557, USA
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