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Foylan S, Schniete JK, Kölln LS, Dempster J, Hansen CG, Shaw M, Bushell TJ, McConnell G. Mesoscale standing wave imaging. J Microsc 2023. [PMID: 37156549 DOI: 10.1111/jmi.13189] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 05/10/2023]
Abstract
Standing wave (SW) microscopy is a method that uses an interference pattern to excite fluorescence from labelled cellular structures and produces high-resolution images of three-dimensional objects in a two-dimensional dataset. SW microscopy is performed with high magnification, high numerical aperture objective lenses, and while this results in high resolution images, the field of view is very small. Here we report upscaling of this interference imaging method from the microscale to the mesoscale using the Mesolens, which has the unusual combination of a low magnification and high numerical aperture. With this method, we produce SW images within a field of view of 4.4 mm x 3.0 mm that can readily accommodate over 16,000 cells in a single dataset. We demonstrate the method using both single-wavelength excitation and the multi-wavelength SW method TartanSW. We show application of the method for imaging of fixed and living cells specimens, with the first application of SW imaging to study cells under flow conditions. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Shannan Foylan
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Jana Katharina Schniete
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Lisa Sophie Kölln
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Carsten Gram Hansen
- University of Edinburgh Centre for Inflammation Research, Institute for Regeneration and Repair, Queen's Medical Research Institute, Edinburgh, UK
| | - Michael Shaw
- Department of Computer Science, Faculty of Engineering Sciences, University College London, London, UK
- Biometrology Group, National Physical Laboratory, Teddington, UK
| | - Trevor John Bushell
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Gail McConnell
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
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Dorr AD, Chopra C, Coulter TI, Dempster J, Dziadzio M, El-Shanawany T, Garcez T, Gompels M, Herriot R, Jain R, Levi M, Lorenzo L, Makki I, Mapazire E, Murng SHK, Noorani S, Savic S, Steele CL, Symons C, Tarzi M, Yong PFK, Kiani-Alikhan S. Lanadelumab for the prevention of hereditary angioedema attacks: A real-world UK audit. Allergy 2022; 78:1369-1371. [PMID: 36510404 DOI: 10.1111/all.15620] [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] [Received: 09/10/2022] [Revised: 11/23/2022] [Accepted: 12/08/2022] [Indexed: 12/15/2022]
Affiliation(s)
| | - Charu Chopra
- Royal Infirmary of Edinburgh, Edinburgh, United Kingdom
| | - Tanya I Coulter
- Belfast Health and Social Care Trust, Belfast, United Kingdom
| | - John Dempster
- University College London Hospitals NHS Foundation Trust, London, United Kingdom
| | - Magdalena Dziadzio
- University College London Hospitals NHS Foundation Trust, London, United Kingdom
| | | | - Tomaz Garcez
- Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Mark Gompels
- North Bristol NHS Trust, Bristol, United Kingdom
| | | | - Rashmi Jain
- Oxford University Hospitals NHS Foundation Trust, United Kingdom
| | - Marcel Levi
- University College London Hospitals NHS Foundation Trust, London, United Kingdom
| | | | - Inas Makki
- Belfast Health and Social Care Trust, Belfast, United Kingdom
| | | | - Sai H K Murng
- Epsom and St Helier University Hospitals NHS Trust, United Kingdom
| | - Sadia Noorani
- Sandwell and West Birmingham Hospitals NHS Trust, Birmingham, United Kingdom
| | - Sinisa Savic
- St James's University Hospital, Leeds, United Kingdom
| | | | | | - Michael Tarzi
- Brighton and Sussex University Hospital NHS Trust, Brighton, United Kingdom
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3
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Shields AM, Anantharachagan A, Arumugakani G, Baker K, Bahal S, Baxendale H, Bermingham W, Bhole M, Boules E, Bright P, Chopra C, Cliffe L, Cleave B, Dempster J, Devlin L, Dhalla F, Diwakar L, Drewe E, Duncan C, Dziadzio M, Elcombe S, Elkhalifa S, Gennery A, Ghanta H, Goddard S, Grigoriadou S, Hackett S, Hayman G, Herriot R, Herwadkar A, Huissoon A, Jain R, Jolles S, Johnston S, Khan S, Laffan J, Lane P, Leeman L, Lowe DM, Mahabir S, Lochlainn DJM, McDermott E, Misbah S, Moghaddas F, Morsi H, Murng S, Noorani S, O'Brien R, Patel S, Price A, Rahman T, Seneviratne S, Shrimpton A, Stroud C, Thomas M, Townsend K, Vaitla P, Verma N, Williams A, Burns SO, Savic S, Richter AG. Outcomes following SARS-CoV-2 infection in patients with primary and secondary immunodeficiency in the UK. Clin Exp Immunol 2022; 209:247-258. [PMID: 35641155 PMCID: PMC8807296 DOI: 10.1093/cei/uxac008] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [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: 11/05/2021] [Revised: 12/16/2021] [Accepted: 01/25/2022] [Indexed: 12/29/2022] Open
Abstract
In March 2020, the United Kingdom Primary Immunodeficiency Network (UKPIN) established a registry of cases to collate the outcomes of individuals with PID and SID following SARS-CoV-2 infection and treatment. A total of 310 cases of SARS-CoV-2 infection in individuals with PID or SID have now been reported in the UK. The overall mortality within the cohort was 17.7% (n = 55/310). Individuals with CVID demonstrated an infection fatality rate (IFR) of 18.3% (n = 17/93), individuals with PID receiving IgRT had an IFR of 16.3% (n = 26/159) and individuals with SID, an IFR of 27.2% (n = 25/92). Individuals with PID and SID had higher inpatient mortality and died at a younger age than the general population. Increasing age, low pre-SARS-CoV-2 infection lymphocyte count and the presence of common co-morbidities increased the risk of mortality in PID. Access to specific COVID-19 treatments in this cohort was limited: only 22.9% (n = 33/144) of patients admitted to the hospital received dexamethasone, remdesivir, an anti-SARS-CoV-2 antibody-based therapeutic (e.g. REGN-COV2 or convalescent plasma) or tocilizumab as a monotherapy or in combination. Dexamethasone, remdesivir, and anti-SARS-CoV-2 antibody-based therapeutics appeared efficacious in PID and SID. Compared to the general population, individuals with PID or SID are at high risk of mortality following SARS-CoV-2 infection. Increasing age, low baseline lymphocyte count, and the presence of co-morbidities are additional risk factors for poor outcome in this cohort.
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Affiliation(s)
- Adrian M Shields
- Clinical Immunology Service, Institute of Immunology and Immunotherapy, University of Birmingham, UK
| | | | - Gururaj Arumugakani
- Department of Clinical Immunology and Allergy, St James University Hospital, Leeds Teaching Hospital NHS Trust, Leeds, UK
| | - Kenneth Baker
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Sameer Bahal
- Department of Immunology, Royal Free London NHS Foundation Trust, London, UK
| | | | | | - Malini Bhole
- The Dudley Group NHS Foundation Trust, Birmingham, UK
| | - Evon Boules
- Clinical Immunology and Allergy Department, Sheffield Teaching Hospitals NHS Foundation Trust, UK
| | - Philip Bright
- Clinical Immunology, North Bristol NHS Trust, Bristol, UK
| | - Charu Chopra
- Department of Haematology & Immunology, Royal Infirmary of Edinburgh, NHS Lothian, UK
| | - Lucy Cliffe
- Clinical Immunology and Allergy Department, Nottingham University Hospital NHS Trust, Nottingham, UK
| | - Betsy Cleave
- Clinical Immunology and Allergy Department, Nottingham University Hospital NHS Trust, Nottingham, UK
| | - John Dempster
- Specialist Allergy and Clinical Immunology, University College London Hospitals, London, UK
| | - Lisa Devlin
- Regional Immunology Service, The Royal Hospitals, Belfast, UK
| | - Fatima Dhalla
- Department of Clinical Immunology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Lavanya Diwakar
- Department of Immunology, Royal Stoke Hospital, Stoke-on-Trent, UK
| | - Elizabeth Drewe
- Clinical Immunology and Allergy Department, Nottingham University Hospital NHS Trust, Nottingham, UK
| | - Christopher Duncan
- Translational and Clinical Research Institute, Immunity and Inflammation Theme, Newcastle University, Newcastle upon Tyne, UK
| | | | - Suzanne Elcombe
- Regional Department of Clinical Immunology & Allergy, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, UK
| | - Shuayb Elkhalifa
- Immunology Department, Salford Royal NHS Foundation Trust, Manchester, UK
| | - Andrew Gennery
- Translational and Clinical Research Institute, Newcastle University, and Paediatric Stem Cell Transplant Unit, Great North Children's Hospital, Newcastle upon Tyne, UK
| | - Harichandrana Ghanta
- Department of Allergy and Clinical Immunology, University Hospital Southampton NHS Trust, University of Southampton, Southampton, UK
| | - Sarah Goddard
- Department of Immunology, Royal Stoke Hospital, Stoke-on-Trent, UK
| | - Sofia Grigoriadou
- Immunology Department, Royal London Hospital, Barts Health NHS Trust, London, UK
| | - Scott Hackett
- Paediatric Immunology Department, University Hospitals of Birmingham, Birmingham, UK
| | - Grant Hayman
- Clinical Immunology Service, South West London Immunodeficiency Centre, Epsom and St Helier University Hospital NHS Trust, London, UK
| | - Richard Herriot
- Immunology Department, Aberdeen Royal Infirmary, Aberdeen, UK
| | - Archana Herwadkar
- Immunology Department, Salford Royal NHS Foundation Trust, Manchester, UK
| | - Aarnoud Huissoon
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Rashmi Jain
- Department of Clinical Immunology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Stephen Jolles
- Immunodeficiency Centre for Wales, University Hospital of Wales, Heath Park, Cardiff, UK
| | - Sarah Johnston
- Clinical Immunology, North Bristol NHS Trust, Bristol, UK
| | - Sujoy Khan
- Hull University Teaching Hospitals NHS Trust, Hull, UK
| | - James Laffan
- Clinical Immunology Service, South West London Immunodeficiency Centre, Epsom and St Helier University Hospital NHS Trust, London, UK
| | - Peter Lane
- Clinical Immunology Service, Institute of Immunology and Immunotherapy, University of Birmingham, UK
| | - Lucy Leeman
- University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - David M Lowe
- Institute of Immunity and Transplantation, University College London, London, UK.,Department of Immunology, Royal Free London NHS Foundation Trust, London, UK
| | - Shanti Mahabir
- Clinical Immunology and Allergy Department, Leicester Royal Infirmary, Leicester, UK
| | | | - Elizabeth McDermott
- Clinical Immunology and Allergy Department, Nottingham University Hospital NHS Trust, Nottingham, UK
| | - Siraj Misbah
- Department of Clinical Immunology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | | | - Hadeil Morsi
- Department of Clinical Immunology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Sai Murng
- Clinical Immunology Service, South West London Immunodeficiency Centre, Epsom and St Helier University Hospital NHS Trust, London, UK
| | - Sadia Noorani
- Clinical Immunology Department, Sandwell & West Birmingham Hospitals NHS Trust, Birmingham, UK
| | - Rachael O'Brien
- Department of Clinical Immunology, Frimley Park Hospital, Frimley, Surrey, UK
| | - Smita Patel
- Department of Clinical Immunology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Arthur Price
- Clinical Immunology and Allergy Department, Leicester Royal Infirmary, Leicester, UK
| | - Tasneem Rahman
- Clinical Immunology Service, South West London Immunodeficiency Centre, Epsom and St Helier University Hospital NHS Trust, London, UK
| | | | - Anna Shrimpton
- Clinical Immunology and Allergy Department, Sheffield Teaching Hospitals NHS Foundation Trust, UK
| | - Catherine Stroud
- Regional Department of Clinical Immunology & Allergy, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, UK
| | - Moira Thomas
- Clinical Immunology Service, NHS Greater Glasgow and Clyde, Glasgow, UK
| | - Katie Townsend
- Clinical Immunology Service, South West London Immunodeficiency Centre, Epsom and St Helier University Hospital NHS Trust, London, UK
| | - Prashantha Vaitla
- Clinical Immunology and Allergy Department, Nottingham University Hospital NHS Trust, Nottingham, UK
| | - Nisha Verma
- Institute of Immunity and Transplantation, University College London, London, UK
| | - Anthony Williams
- Department of Allergy and Clinical Immunology, University Hospital Southampton NHS Trust, University of Southampton, Southampton, UK
| | - Siobhan O Burns
- Institute of Immunity and Transplantation, University College London, London, UK.,Department of Immunology, Royal Free London NHS Foundation Trust, London, UK
| | - Sinisa Savic
- Department of Clinical Immunology and Allergy, St James University Hospital, Leeds Teaching Hospital NHS Trust, Leeds, UK
| | - Alex G Richter
- Clinical Immunology Service, Institute of Immunology and Immunotherapy, University of Birmingham, UK
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Shields AM, Tadros S, Al-Hakim A, Nell JM, Lin MMN, Chan M, Goddard S, Dempster J, Dziadzio M, Patel SY, Elkalifa S, Huissoon A, Duncan CJA, Herwadkar A, Khan S, Bethune C, Elcombe S, Thaventhiran J, Klenerman P, Lowe DM, Savic S, Burns SO, Richter AG. Impact of vaccination on hospitalization and mortality from COVID-19 in patients with primary and secondary immunodeficiency: The United Kingdom experience. Front Immunol 2022; 13:984376. [PMID: 36211396 PMCID: PMC9539662 DOI: 10.3389/fimmu.2022.984376] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/18/2022] [Indexed: 12/29/2022] Open
Abstract
Background Individuals with primary and secondary immunodeficiency (PID/SID) were shown to be at risk of poor outcomes during the early stages of the SARS-CoV-2 pandemic. SARS-CoV-2 vaccines demonstrate reduced immunogenicity in these patients. Objectives To understand whether the risk of severe COVID-19 in individuals with PID or SID has changed following the deployment of vaccination and therapeutics in the context of the emergence of novel viral variants of concern. Methods The outcomes of two cohorts of patients with PID and SID were compared: the first, infected between March and July 2020, prior to vaccination and treatments, the second after these intervention became available between January 2021 and April 2022. Results 22.7% of immunodeficient patients have been infected at least once with SARS-CoV-2 since the start of the pandemic, compared to over 70% of the general population. Immunodeficient patients were typically infected later in the pandemic when the B.1.1.529 (Omicron) variant was dominant. This delay was associated with receipt of more vaccine doses and higher pre-infection seroprevalence. Compared to March-July 2020, hospitalization rates (53.3% vs 17.9%, p<0.0001) and mortality (Infection fatality rate 20.0% vs 3.4%, p=0.0003) have significantly reduced for patients with PID but remain elevated compared to the general population. The presence of a serological response to vaccination was associated with a reduced duration of viral detection by PCR in the nasopharynx. Early outpatient treatment with antivirals or monoclonal antibodies reduced hospitalization during the Omicron wave. Conclusions Most individuals with immunodeficiency in the United Kingdom remain SARS-CoV-2 infection naïve. Vaccination, widespread availability of outpatient treatments and, possibly, the emergence of the B.1.1.529 variant have led to significant improvements in morbidity and mortality followings SARS-CoV-2 infection since the start of the pandemic. However, individuals with PID and SID remain at significantly increased risk of poor outcomes compared to the general population; mitigation, vaccination and treatment strategies must be optimized to minimize the ongoing burden of the pandemic in these vulnerable cohorts.
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Affiliation(s)
- Adrian M. Shields
- Clinical Immunology Service, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Department of Clinical Immunology, University Hospitals Birmingham National Health Service (NHS) Foundation Trust, Birmingham, United Kingdom
| | - Susan Tadros
- Department of Immunology, Royal Free London National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Adam Al-Hakim
- Department of Allergy and Clinical Immunology, Leeds Teaching Hospitals National Health Service (NHS) Trust, Leeds, United Kingdom
| | - Jeremy M. Nell
- Department of Infection and Tropical Medicine, Newcastle upon Tyne Hospitals National Health Service (NHS) Foundation Trust and Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Me Me Nay Lin
- Department of Immunology, Royal Free London National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Michele Chan
- Department of Immunology, Royal Free London National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Sarah Goddard
- Department of Clinical Immunology, University Hospitals North Midlands, Stoke-on-Trent, United Kingdom
| | - John Dempster
- Department of Clinical Immunology, University College London Hospital National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Magdalena Dziadzio
- Department of Clinical Immunology, University College London Hospital National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Smita Y. Patel
- National Institute for Health and Care Research (NIHR) Biomedical Research Centre (BRC) Oxford Biomedical Centre, University of Oxford, Oxford, United Kingdom
- Department of Clinical Immunology, Oxford University Hospitals National Health Service (NHS) Foundation Trust, Oxford, United Kingdom
| | - Shuayb Elkalifa
- Department of Immunology, Salford Royal National Health Service (NHS) Foundation Trust, Salford, United Kingdom
| | - Aarnoud Huissoon
- Department of Clinical Immunology, University Hospitals Birmingham National Health Service (NHS) Foundation Trust, Birmingham, United Kingdom
| | - Christopher J. A. Duncan
- Department of Infection and Tropical Medicine, Newcastle upon Tyne Hospitals National Health Service (NHS) Foundation Trust and Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Archana Herwadkar
- Department of Immunology, Salford Royal National Health Service (NHS) Foundation Trust, Salford, United Kingdom
| | - Sujoy Khan
- Department of Clinical Immunology, Hull University Teaching Hospitals National Health Service (NHS) Trust, Hull, United Kingdom
| | - Claire Bethune
- Department of Allergy and Clinical Immunology, University Hospitals Plymouth National Health Service (NHS) Trust, Plymouth, United Kingdom
| | - Suzanne Elcombe
- Department of Allergy and Clinical Immunology, Newcastle upon Tyne Hospitals National Health Service (NHS) Foundation Trust, Newcastle upon Tyne, Newcastle, United Kingdom
| | - James Thaventhiran
- Medical Research Council Toxicology Unit, University of Cambridge, Cambridge, United Kingdom
| | - Paul Klenerman
- Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - David M. Lowe
- Department of Immunology, Royal Free London National Health Service (NHS) Foundation Trust, London, United Kingdom
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Sinisa Savic
- Department of Allergy and Clinical Immunology, Leeds Teaching Hospitals National Health Service (NHS) Trust, Leeds, United Kingdom
| | - Siobhan O. Burns
- Department of Immunology, Royal Free London National Health Service (NHS) Foundation Trust, London, United Kingdom
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Alex G. Richter
- Clinical Immunology Service, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Department of Clinical Immunology, University Hospitals Birmingham National Health Service (NHS) Foundation Trust, Birmingham, United Kingdom
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Morsi H, Grammatikos A, Steele C, Stroud C, Chopra C, Eren E, Moon E, Hayman G, Ghanta H, Bourne H, Dempster J, Townsend K, Ahuja M, Frleta-Gilchrist M, Zhang M, Thomas M, Herriot R, Murng S, Drinkwater S, Elcombe S, Coulter T, El-shanawany T, Garcez T, Yong P, Jain R. A Multicentre UK-Based Audit on Acquired C1 Inhibitor Deficiency 2021. J Allergy Clin Immunol 2022. [DOI: 10.1016/j.jaci.2021.12.557] [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: 11/25/2022]
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Kettlewell S, Saxena P, Dempster J, Colman MA, Myles RC, Smith GL, Workman AJ. Dynamic clamping human and rabbit atrial calcium current: narrowing I CaL window abolishes early afterdepolarizations. J Physiol 2019; 597:3619-3638. [PMID: 31093979 PMCID: PMC6767690 DOI: 10.1113/jp277827] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 02/13/2019] [Accepted: 05/13/2019] [Indexed: 11/08/2022] Open
Abstract
Key points Early‐afterdepolarizations (EADs) are abnormal action potential oscillations and a known cause of cardiac arrhythmias. Ventricular EADs involve reactivation of a Ca2+ current (ICaL) in its ‘window region’ voltage range. However, electrical mechanisms of atrial EADs, a potential cause of atrial fibrillation, are poorly understood. Atrial cells were obtained from consenting patients undergoing heart surgery, as well as from rabbits. ICaL was blocked with nifedipine and then a hybrid patch clamp/mathematical‐modelling technique, ‘dynamic clamping’, was used to record action potentials at the same time as injecting an artificial, modifiable, ICaL (ICaL,D‐C). Progressively widening the ICaL,D‐C window region produced EADs of various types, dependent on window width. EAD production was strongest upon moving the activation (vs. inactivation) side of the window. EADs were then induced by a different method: increasing ICaL,D‐C amplitude and/or K+ channel‐blockade (4‐aminopyridine). Narrowing of the ICaL,D‐C window by ∼10 mV abolished these EADs. Atrial ICaL window narrowing is worthy of further testing as a potential anti‐atrial fibrillation drug mechanism.
Abstract Atrial early‐afterdepolarizations (EADs) may contribute to atrial fibrillation (AF), perhaps involving reactivation of L‐type Ca2+ current (ICaL) in its window region voltage range. The present study aimed (i) to validate the dynamic clamp technique for modifying the ICaL contribution to atrial action potential (AP) waveform; (ii) to investigate the effects of widening the window ICaL on EAD‐propensity; and (iii) to test whether EADs from increased ICaL and AP duration are supressed by narrowing the window ICaL. ICaL and APs were recorded from rabbit and human atrial myocytes by whole‐cell‐patch clamp. During AP recording, ICaL was inhibited (3 µm nifedipine) and replaced by a dynamic clamp model current, ICaL,D‐C (tuned to native ICaL characteristics), computed in real‐time (every 50 µs) based on myocyte membrane potential. ICaL,D‐C‐injection restored the nifedipine‐suppressed AP plateau. Widening the window ICaL,D‐C, symmetrically by stepwise simultaneous equal shifts of half‐voltages (V0.5) of ICaL,D‐C activation (negatively) and inactivation (positively), generated EADs (single, multiple or preceding repolarization failure) in a window width‐dependent manner, as well as AP alternans. A stronger EAD‐generating effect resulted from independently shifting activation V0.5 (asymmetrical widening) than inactivation V0.5; for example, a 15 mV activation shift produced EADs in nine of 17 (53%) human atrial myocytes vs. 0 of 18 from inactivation shift (P < 0.05). In 11 rabbit atrial myocytes in which EADs were generated either by increasing the conductance of normal window width ICaL,D‐C or subsequent 4‐aminopyridine (2 mm), window ICaL,D‐C narrowing (10 mV) abolished EADs of all types (P < 0.05). The present study validated the dynamic clamp for ICaL, which is novel in atrial cardiomyocytes, and showed that EADs of various types are generated by widening (particularly asymmetrically) the window ICaL, as well as abolished by narrowing it. Window ICaL narrowing is a potential therapeutic mechanism worth pursuing in the search for improved anti‐AF drugs. Early‐afterdepolarizations (EADs) are abnormal action potential oscillations and a known cause of cardiac arrhythmias. Ventricular EADs involve reactivation of a Ca2+ current (ICaL) in its ‘window region’ voltage range. However, electrical mechanisms of atrial EADs, a potential cause of atrial fibrillation, are poorly understood. Atrial cells were obtained from consenting patients undergoing heart surgery, as well as from rabbits. ICaL was blocked with nifedipine and then a hybrid patch clamp/mathematical‐modelling technique, ‘dynamic clamping’, was used to record action potentials at the same time as injecting an artificial, modifiable, ICaL (ICaL,D‐C). Progressively widening the ICaL,D‐C window region produced EADs of various types, dependent on window width. EAD production was strongest upon moving the activation (vs. inactivation) side of the window. EADs were then induced by a different method: increasing ICaL,D‐C amplitude and/or K+ channel‐blockade (4‐aminopyridine). Narrowing of the ICaL,D‐C window by ∼10 mV abolished these EADs. Atrial ICaL window narrowing is worthy of further testing as a potential anti‐atrial fibrillation drug mechanism.
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Affiliation(s)
- Sarah Kettlewell
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, Glasgow, UK
| | - Priyanka Saxena
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, Glasgow, UK
| | - John Dempster
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | | | - Rachel C Myles
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, Glasgow, UK
| | - Godfrey L Smith
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, Glasgow, UK
| | - Antony J Workman
- Institute of Cardiovascular & Medical Sciences, University of Glasgow, Glasgow, UK
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Dempster J. Practicalities of a reduced volume formulation of a C1-INH concentrate for the treatment of hereditary angioedema: real-life experience. Allergy Asthma Clin Immunol 2018; 14:44. [PMID: 30386384 PMCID: PMC6201499 DOI: 10.1186/s13223-018-0267-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 05/23/2018] [Indexed: 11/22/2022] Open
Abstract
Background Hereditary angioedema (HAE) due to C1 esterase inhibitor (C1-INH) deficiency is characterized by recurrent swelling attacks that can be life-threatening if left untreated. Prompt treatment is vital during acute attacks; plasma-derived C1-INH (Berinert®) is one treatment currently licensed for the intravenous treatment of acute HAE attacks in adults, adolescents and children. A new, volume-reduced formulation, of C1-INH is currently available which aims to reduce the time to treatment, and provide greater convenience to patients and healthcare professionals. Here we compare the clinical experience of the reduced volume 1500 IU vial with multiple 500 IU vials. Methods HAE patients treated with C1-INH at the Royal London Hospital were selected to take part in this assessment. Included patients were aged 10–65 with moderate to severe HAE requiring high doses of C1-INH. The practicalities of the reduced 1500 IU vial compared with multiple 500 IU vials were assessed, including preparation and administration time, training to self-administer time and several quality of life aspects. Results Twenty-three patients participated in this study. Twenty-one patients were previously treated with C1-INH (Berinert®) 500 IU for 1–14 years prior to switching to the 1500 IU vial format, two patients were naïve to C1-INH (Berinert®). Preparation and administration of C1-INH (Berinert®) 1500 IU was faster than an equivalent dose with multiple 500 IU vials (11 and 17 min, respectively) and also required less time to train to self-administer (45 and 55 min, respectively). Overall, patients rated the 1500 IU vial format higher in all assessed aspects than the 500 IU format, including preparation, administration, training, travel and storage. Nonetheless, reconstitution of the 1500 IU vial was noted more difficult, requiring gentle mixing to fully dissolve prior to intravenous injection. Patients remained stable on C1-INH (Berinert®) 1500 IU; two patients switched back to multiple 500 IU vials due to headaches and preference for a larger volume. Conclusions The volume-reduced C1-INH concentrate (Berinert®) 1500 IU is a practical and convenient alternative to multiple 500 IU vials for the treatment of HAE, which provides patients with more control and independence over their disease owing to a simpler to administer treatment.
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Affiliation(s)
- John Dempster
- Barts Health, Grahame Hayton Unit, Ambrose King Centre, The Royal London Hospital, Whitechapel, London, E1 1BB UK
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Longhurst HJ, Dempster J, Lorenzo L, Buckland M, Grigoriadou S, Symons C, Bethune C, Fabien V, Bangs C, Garcez T. Real-world outcomes in hereditary angioedema: first experience from the Icatibant Outcome Survey in the United Kingdom. Allergy Asthma Clin Immunol 2018; 14:28. [PMID: 30127805 PMCID: PMC6091163 DOI: 10.1186/s13223-018-0253-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 04/09/2018] [Indexed: 12/16/2022] Open
Abstract
Background Hereditary angioedema (HAE) is a potentially life-threatening, bradykinin-mediated disease, often misdiagnosed and under-treated, with long diagnostic delays. There are limited real-world data on best-practice management of HAE in the UK. Objectives To characterize the clinical profile, management and outcomes of patients with HAE type I and II from three specialist centres in the UK using data from the Icatibant Outcome Survey (IOS; Shire, Zug, Switzerland), an international observational study monitoring safety and effectiveness of icatibant, a selective bradykinin B2 receptor antagonist. Methods We performed retrospective analyses of IOS data for patients with HAE type I and II from three centres in the UK and compared UK data with pooled IOS data from 10 countries (48 centres). Results Analyses included 73 UK and 579 non-UK patients with HAE type I or II. Median diagnostic delay was 6.2 and 5.9 years, respectively. Analysis of data collected from February 2008 to July 2016 included 286 icatibant-treated attacks in 58 UK patients and 2553 icatibant-treated attacks in 436 non-UK patients (median of 3.0 attacks per patient in both groups). More attacks were treated by icatibant self-administration in UK patients (95.8%) than in non-UK patients (86.8%, p < 0.001). Time to icatibant treatment, time to resolution and attack duration were not significantly different in the UK versus non-UK patients. Conclusion UK patients from the specialist centres studied report similar diagnostic delay and similar icatibant treatment outcomes to their non-UK counterparts. However, improvements in the timely diagnosis of HAE are still required. Trial registration ClinicalTrials.gov NCT01034969
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Affiliation(s)
- Hilary J Longhurst
- 1Department of Clinical Biochemistry and Immunology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - John Dempster
- 2Department of Immunology, Barts Health NHS Trust, London, UK
| | - Lorena Lorenzo
- 2Department of Immunology, Barts Health NHS Trust, London, UK
| | | | | | - Christine Symons
- 3Department of Immunology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | - Claire Bethune
- 3Department of Immunology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | | | - Catherine Bangs
- Department of Immunology, Central Manchester University Hospital NHS Foundation Trust, Manchester, UK
| | - Tomaz Garcez
- Department of Immunology, Central Manchester University Hospital NHS Foundation Trust, Manchester, UK
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Mawlood SK, Dennany L, Watson N, Dempster J, Pickard BS. Quantification of global mitochondrial DNA methylation levels and inverse correlation with age at two CpG sites. Aging (Albany NY) 2017; 8:636-41. [PMID: 26887692 PMCID: PMC4925819 DOI: 10.18632/aging.100892] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [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: 10/26/2015] [Accepted: 01/20/2016] [Indexed: 12/20/2022]
Abstract
Mammalian ageing features biological attrition evident at cellular, genetic and epigenetic levels. Mutation of mitochondrial DNA, and nuclear DNA methylation changes are well established correlates of ageing. The methylation of mitochondrial DNA (mtDNA) is a new and incompletely described phenomenon with unknown biological control and significance. Here we describe the bisulphite sequencing of mtDNA from 82 individuals aged 18‐91 years. We detected low and variable levels of mtDNA methylation at 54 of 133 CpG sites interrogated. Regression analysis of methylation levels at two CpG sites (M1215 and M1313) located within the 12S ribosomal RNA gene showed an inverse correlation with subject age suggesting their utility as epigenetic markers of ageing.
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Affiliation(s)
- Shakhawan K Mawlood
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
| | - Lynn Dennany
- Centre for Forensic Science, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, Scotland, UK
| | - Nigel Watson
- Centre for Forensic Science, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, Scotland, UK
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
| | - Benjamin S Pickard
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
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Saxena P, Dempster J, Smith GL, Workman AJ. 106Exploring atrial action potential responses to changes in calcium window current characteristics. Europace 2017. [DOI: 10.1093/ehjci/eux134.003] [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: 11/13/2022] Open
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Schmaier AH, Cicardi M, Reshef A, Moldovan D, Mócsai A, López-Trascasa M, Lera AL, Brown NJ, Germenis AE, Filippelli-Silva R, Duarte DA, Martin RP, Veronez CL, Bouvier M, Bader M, Costa-Neto CM, Pesquero JB, Charest-Morin X, Marceau F, Rivard GÉ, Bonnefoy A, Wagner É, Debreczeni ML, Németh Z, Kajdácsi E, Schwaner E, Cervenak L, Oroszlán G, Szilágyi A, Dani R, Závodszky P, Gál P, Dobó J, Hébert J, Vincent M, Boursiquot JN, Chapdeleine H, Desjardins M, Laramée B, Gagnon R, Payette N, Lepeshkina O, Charignon D, Ghannam A, Ponard D, Drouet C, Joseph K, Tholanikunnel BG, Sexton DJ, Kaplan AP, Loffredo S, Bova M, Ferrara AL, Petraroli A, Suffritti C, Veszeli N, Zanichelli A, Farkas H, Marone G, Luyasu S, Favier B, Martin L, Kőhalmi KV, Temesszentandrási G, Várnai K, Varga L, Zuraw BL, Feussner A, Tortorici MA, Pawaskar D, Li HH, Anderson J, Bernstein JA, Zhang Y, Pragst I, Aygören-Pürsün E, Jacobson K, Christensen J, Van Leerberghe A, Wang Y, Schranz J, Martinez-Saguer I, Soteres D, Steiner U, Panovska VG, Rae W, Aberer W, Huissoon A, Bygum A, Magerl M, Graff J, Longhurst H, Lleonart R, Fang L, Cornpropst M, Clemons D, Mathis A, Collis P, Dobo S, Sheridan WP, Maurer M, Riedl MA, Craig T, Banerji A, Shennak M, Yang W, Baptista J, Busse P, Kalfus I, McDonald A, Qian S, Roberts A, Panousis C, Green T, Gille A, Zamanakou M, Loules G, Csuka D, Psarros F, Parsopoulou F, Speletas M, Firinu D, De Pasquale TMA, Zoli A, Radice A, Pizzimenti S, Manoussakis E, Konstantinou GN, Bafunno V, Montinaro V, Cancian M, Margaglione M, Bork K, Wulff K, Witzke G, Hardt J, Bouillet L, Caballero T, Grumach AS, Pommie C, Andresen I, Ettingshausen CE, Gutowski Z, Andritschke K, Linde R, Andrási N, Szilágyi T, Leibovich-Nassi I, Symons C, Dempster J, Boccon-Gibod I, Pagnier A, Lehmann A, Kreiberg KB, Nieto SA, Martins R, Martins R, Menendez A, Valle SOR, Olivares M, Hernandez-Landeros ME, Nievas E, Fili N, Barrera OM, Bailleau R, Gallardo-Olivos AM, Grau M, Rodriguez-Galindo J, Carabantes MJO, Zapata-Venegas E, Alfonso MM, Rosario-Grauert M, Ratti M, Vaszquez D, Josviack D, Landivar-Salinas LF, Calderón-Llosa OME, Campilay-Sarmiento R, Raby P, Fabiani J, Lumry WR, Feuersenger H, Watson DJ, Machnig T, Lamacchia D, Hernanz A, Alvez A, Lluncor M, Pedrosa M, Cabañas R, Prior N, Nordenfelt P, Nilsson M, Lindfors A, Wahlgren CF, Björkander J, Hakl R, Kuklínek P, Krčmová I, Hanzlíková J, Vachová M, Zachová R, Sobotková M, Strenková J, Litzman J, Palasopoulou M, Tsinti G, Gianni P, Kompoti M, Garrido S, Dyga W, Bogdali A, Obtułowicz A, Tomasz M, Czarnobilska E, Obtulowicz K, Książek T, Koncz A, Gulyás D, Staevska M, Jesenak M, Hrubiskova K, Bellizzi L, Relan A, Wu MA, Castelli A, Colombo R, Podda G, Del Medico M, Catena E, Casella F, Perego F, Afifi NA, Tobaldini E, Montano N, Sánchez-Jareño M, Stobiecki M, Obtułowicz K, Guryanova I, Polyakova E, Lebedz V, Salivonchik A, Aleshkevich S, Belevtsev M, Nordmann-Kleiner M, Trainotti S, Hahn J, Greve J, Zabrodska L, Alonso MLO, Tórtora RP, França AT, Ribeiro MG, Fu L, Kanani A, Lacuesta G, Waserman S, Betschel S, Espinosa MI, Contreras FA, Hrubisko M, Vavrova L, Banovcin P, Ayazi M, Fazlollahi MR, Saghafi S, Mohammadian S, Deshiry SN, Bidad K, Shoormasti RS, Mohammadzadeh I, Bemanian MH, Mahdaviani SA, Pourpak Z, Valerieva A, Vasileva M, Velikova T, Petkova E, Dimitrov V, Di Maulo R, Somech R, Golander H, Sifuentes EJ, Mansard C, Gompel A, Floccard B, Blanchard-Delaunay C, Launay D, Fain O, Sobel A, Gayet S, Amarger S, Armengol G, Ollivier Y, Zélinsky-Gurung A, Jeandel PY, Kanny G, Coppéré B, Dubrel M, Pelletier F, Du Thanh A, Trouiller S, Laurent J, De Moreuil C, Pajot CA, Belot A, Rodríguez A, Roa D, Prieto A, Baeza ML, Krusheva B, Almeida SKA, Constantino-Silva RN, Melo N, Simoes JA, Palma SMU, da Silva J, de Azevedo BF, Mansour E, González-Quevedo T, Marcos C, Lobera T, de San Pedro BS, Avilla E, Badiou J, Binkley K, Borici-Mazi R, Howlett L, Keith PK, Rowe A, Waite P, Billebeau A, Boccon-Gibbod I, Lis K, Laitman Y, Friedman E, Gokmen NM, Gulbahar O, Onay H, Koc ZP, Sin AZ. Abstracts from the 10th C1-inhibitor deficiency workshop. Allergy Asthma Clin Immunol 2017. [PMCID: PMC5496025 DOI: 10.1186/s13223-017-0198-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Champney F, Maddock L, Welford J, Kemp J, Allan V, Persidskikh Y, Orini M, Ang R, Workman A, Wong L, Honarbakhsh S, Leong K, Silberbauer J, O'Nunain S, Gomes J, McCready J, Bostock J, Shaw K, McKenna C, Bailey J, Honarbakhsh S, Casas J, Wallace J, Hunter R, Schilling R, Perel P, Morley K, Banerjee A, Hemingway H, Mrochak A, Ilyina T, Goncharik D, Chasnoits A, Plashinskaya L, Taggart P, Hayward M, Lambiase P, Hosford P, Kasparov S, Lambiase P, Tinker A, Gourine A, Kettlewell S, Dempster J, Colman M, Rankin A, Myles R, Smith G, Tester D, Jaye A, FitzPatrick D, Evans M, Fleming P, Jeffrey I, Cohen M, Simpson M, Ackerman M, Behr E, Srinivasan N, Kirkby C, Firman E, Tobin L, Murphy C, Lowe M, Hunter RJ, Finlay M, Schilling RJ, Lambiase PD, Ng F, Tomlinson L, Nuthoo S, Cajilog E, Lefroy D, Qureshi N, Koa-Wing M, Whinnett Z, Linton N, Davies D, Lim P, Peters N, Kanagaratnam P, Varnava A. ORAL ABSTRACTS (1)Allied Professionals7CRYOABLATION FOR PAROXYSMAL ATRIAL FIBRILLATION - IS AN EP LAB REQUIRED?8A PATHWAY TO SAFETY - ANTICOAGULATION COMPLIANCE IN CIED PATIENTS WITH AF9UNDERSTANDING THE WAYS IN WHICH OCCUPATION IS AFFECTED BY POSTURAL TACHYCARDIA SYNDROME: A UK OCCUPATIONAL THERAPY PERSPECTIVE10DEVELOPMENT OF AN INTERGRATED SUPPORT PATHWAY FOR PATIENTS FULFILLING NICE CRITERIA FOR AN INTERNAL CARDIOVASCULAR DEBRIBRILLATOR (ICD) IN A DISTRICT GENERAL HOSPITAL11ARE CARDIOVASCULAR RISK FACTORS ALSO ASSOCIATED WITH THE INCIDENCE OF ATRIAL FIBRILLATION? A SYSTEMATIC REVIEW AND FIELD SYNOPSIS OF 23 FACTORS IN 32 INITIALLY HEALTHY COHORTS OF 20 MILLION PARTICIPANTS12BRAIN MRI FINDINGS IN PATIENTS WITH ATRIAL FIBRILLATION UNDERGOING CARDIOVERSIONBasic Science/Sudden Cardiac Death13PRELIMINARY ASSESSMENT OF THE “RE-ENTRY VULNERABILITY INDEX” AS A MARKER OF CARDIAC INSTABILITY IN THE HUMAN HEART USING WHOLE-HEART CONTACT EPICARDIAL MAPPING14OPTOGENETIC STIMULATION OF BRAINSTEM'S VAGAL PREGANGLIONIC NEURONES IS ASSOCIATED WITH NEURONAL NITRIC OXIDE SYNTHASE-DEPENDENT PROLONGATION OF VENTRICULAR EFFECTIVE REFRACTORY PERIOD15A DYNAMIC-CLAMP STUDY OF L-TYPE Ca2+ CURRENT IN RABBIT AND HUMAN ATRIAL MYOCYTES: THE CONTRIBUTION OF WINDOW ICaL TO EARLY AFTERDEPOLARISATIONS16WHOLE EXOME SEQUENCING IN SUDDEN INFANT DEATH SYNDROME17MEDIUM TERM SURVIVAL AND FAMILY SCREENING OUTCOMES IN AN IDIOPATHIC VENTRICULAR FIBRILLATION COHORT - A MULTICENTRE EXPERIENCE18CLINICAL CHARACTERISTICS OF SCD SURVIVORS WITH BRUGADA SYNDROME:- ARE SPONSANEOUS TYPE I ECG AND PREVIOUS SYNCOPE REALLY ASSOCIATED WITH HIGH RISK? Europace 2016. [DOI: 10.1093/europace/euw270] [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: 11/14/2022] Open
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McConnell G, Trägårdh J, Amor R, Dempster J, Reid E, Amos WB. A novel optical microscope for imaging large embryos and tissue volumes with sub-cellular resolution throughout. eLife 2016; 5. [PMID: 27661778 PMCID: PMC5035146 DOI: 10.7554/elife.18659] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [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: 06/09/2016] [Accepted: 08/23/2016] [Indexed: 01/31/2023] Open
Abstract
Current optical microscope objectives of low magnification have low numerical aperture and therefore have too little depth resolution and discrimination to perform well in confocal and nonlinear microscopy. This is a serious limitation in important areas, including the phenotypic screening of human genes in transgenic mice by study of embryos undergoing advanced organogenesis. We have built an optical lens system for 3D imaging of objects up to 6 mm wide and 3 mm thick with depth resolution of only a few microns instead of the tens of microns currently attained, allowing sub-cellular detail to be resolved throughout the volume. We present this lens, called the Mesolens, with performance data and images from biological specimens including confocal images of whole fixed and intact fluorescently-stained 12.5-day old mouse embryos. DOI:http://dx.doi.org/10.7554/eLife.18659.001 For hundreds of years, optical microscopes have allowed living tissues to be studied in fine detail. Unfortunately, the images captured through typical microscope lenses feature a compromise between the level of detail in the image and how much of a sample can be shown. For example, densely packed individual cells often cannot be distinguished in an image that shows an entire mouse embryo. To address this issue, McConnell et al. have developed a microscope lens called the Mesolens. This can magnify samples by up to four times in much higher detail than conventional lenses that produce the same magnification. McConnell et al. tested the Mesolens as part of a technique called confocal microscopy, which can reconstruct the three-dimensional structure of a sample by collecting images from different layers. The resulting images allowed individual cells to be distinguished in cultures of rat brain cells. Furthermore, images of 10–12 day old mouse embryos contained enough detail to reveal many of the structures found inside cells, and allowed the distribution of cells to be tracked in developing organs such as the heart. Ultimately, the Mesolens has the potential to be used in many different applications and could assist in the study of many biological processes. In the future, McConnell et al. will test how effectively the Mesolens works as part of other microscopy techniques. DOI:http://dx.doi.org/10.7554/eLife.18659.002
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Affiliation(s)
- Gail McConnell
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Johanna Trägårdh
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Rumelo Amor
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - John Dempster
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Es Reid
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - William Bradshaw Amos
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom.,MRC Laboratory of Molecular Biology, Cambridge, United Kingdom
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Banerji A, Baş M, Bernstein JA, Boccon-Gibod I, Bova M, Dempster J, Grumach AS, Magerl M, Poarch K, Ferreira MB. Expert perspectives on hereditary angioedema: Key areas for advancements in care across the patient journey. Allergy Rhinol (Providence) 2016; 7:172-181. [PMID: 27661998 PMCID: PMC5244276 DOI: 10.2500/ar.2016.7.0165] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Published literature documents the substantial burden of hereditary angioedema (HAE) with C1 inhibitor deficiency on the quality of life and work productivity of patients. However, despite advances in the field and the availability of guidelines to advise health care providers (HCP) on the diagnosis and management of HAE, there are still many challenges to overcome. For example, delayed diagnosis and misdiagnosis are common, and treatment practices vary worldwide. OBJECTIVE An international expert panel was convened to consider opportunities for improvements that would benefit patients with HAE. METHODS Based on professional and personal experiences, the experts developed schematics to describe the journey of patients through the following stages: (1) onset of symptoms and initial evaluation; (2) referral/diagnosis; and (3) management of HAE. More importantly, the panel identified key areas in which it was possible to optimize the support provided to patients and HCPs along this journey. RESULTS Overall, this approach highlighted the need for wider dissemination of algorithms and scientific data to more effectively educate HCPs from multiple disciplines and the need for more research to inform appropriate treatment decisions. Furthermore, HAE awareness campaigns, accurate online information, and referral to patient advocacy groups were all considered helpful approaches to support patients. CONCLUSION More detailed and widespread information on the diagnosis and management of HAE is needed and may lead to advancements in care throughout the journey of the patient with HAE.
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Affiliation(s)
- Aleena Banerji
- From the Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Murat Baş
- Ear, Nose and Throat Clinic, Klinikum Rechts der Isar, Technische Universität München, Munich, Germany
| | - Jonathan A. Bernstein
- Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Isabelle Boccon-Gibod
- University Clinic of Internal Medicine, Grenoble University Hospital, Grenoble, France
| | - Maria Bova
- Department of Translational Medical Sciences and Center for Basic and Clinical Immunology Research, University of Naples Federico II, Naples, Italy
| | - John Dempster
- Immunology Department, Barts and the London NHS Trust, London, United Kingdom
| | | | - Markus Magerl
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Kimberly Poarch
- Allergy and Asthma Specialists of Dallas, Dallas, Texas, and
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Sandison ME, Dempster J, McCarron JG. The transition of smooth muscle cells from a contractile to a migratory, phagocytic phenotype: direct demonstration of phenotypic modulation. J Physiol 2016; 594:6189-6209. [PMID: 27393389 PMCID: PMC5088226 DOI: 10.1113/jp272729] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 04/28/2016] [Accepted: 06/26/2016] [Indexed: 12/13/2022] Open
Abstract
Key points Smooth muscle cell (SMC) phenotypic conversion from a contractile to a migratory phenotype is proposed to underlie cardiovascular disease but its contribution to vascular remodelling and even its existence have recently been questioned. Tracking the fate of individual SMCs is difficult as no specific markers of migratory SMCs exist. This study used a novel, prolonged time‐lapse imaging approach to continuously track the behaviour of unambiguously identified, fully differentiated SMCs. In response to serum, highly‐elongated, contractile SMCs initially rounded up, before spreading and migrating and these migratory cells displayed clear phagocytic activity. This study provides a direct demonstration of the transition of fully contractile SMCs to a non‐contractile, migratory phenotype with phagocytic capacity that may act as a macrophage‐like cell.
Abstract Atherosclerotic plaques are populated with smooth muscle cells (SMCs) and macrophages. SMCs are thought to accumulate in plaques because fully differentiated, contractile SMCs reprogramme into a ‘synthetic’ migratory phenotype, so‐called phenotypic modulation, whilst plaque macrophages are thought to derive from blood‐borne myeloid cells. Recently, these views have been challenged, with reports that SMC phenotypic modulation may not occur during vascular remodelling and that plaque macrophages may not be of haematopoietic origin. Following the fate of SMCs is complicated by the lack of specific markers for the migratory phenotype and direct demonstrations of phenotypic modulation are lacking. Therefore, we employed long‐term, high‐resolution, time‐lapse microscopy to track the fate of unambiguously identified, fully‐differentiated, contractile SMCs in response to the growth factors present in serum. Phenotypic modulation was clearly observed. The highly elongated, contractile SMCs initially rounded up, for 1–3 days, before spreading outwards. Once spread, the SMCs became motile and displayed dynamic cell‐cell communication behaviours. Significantly, they also displayed clear evidence of phagocytic activity. This macrophage‐like behaviour was confirmed by their internalisation of 1 μm fluorescent latex beads. However, migratory SMCs did not uptake acetylated low‐density lipoprotein or express the classic macrophage marker CD68. These results directly demonstrate that SMCs may rapidly undergo phenotypic modulation and develop phagocytic capabilities. Resident SMCs may provide a potential source of macrophages in vascular remodelling. Smooth muscle cell (SMC) phenotypic conversion from a contractile to a migratory phenotype is proposed to underlie cardiovascular disease but its contribution to vascular remodelling and even its existence have recently been questioned. Tracking the fate of individual SMCs is difficult as no specific markers of migratory SMCs exist. This study used a novel, prolonged time‐lapse imaging approach to continuously track the behaviour of unambiguously identified, fully differentiated SMCs. In response to serum, highly‐elongated, contractile SMCs initially rounded up, before spreading and migrating and these migratory cells displayed clear phagocytic activity. This study provides a direct demonstration of the transition of fully contractile SMCs to a non‐contractile, migratory phenotype with phagocytic capacity that may act as a macrophage‐like cell.
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Affiliation(s)
- Mairi E Sandison
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, SIPBS Building, 161 Cathedral Street, Glasgow, G4 0RE, UK
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, SIPBS Building, 161 Cathedral Street, Glasgow, G4 0RE, UK
| | - John G McCarron
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, SIPBS Building, 161 Cathedral Street, Glasgow, G4 0RE, UK.
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Amor R, McDonald A, Trägårdh J, Robb G, Wilson L, Abdul Rahman NZ, Dempster J, Amos WB, Bushell TJ, McConnell G. Widefield Two-Photon Excitation without Scanning: Live Cell Microscopy with High Time Resolution and Low Photo-Bleaching. PLoS One 2016; 11:e0147115. [PMID: 26824845 PMCID: PMC4732674 DOI: 10.1371/journal.pone.0147115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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: 01/19/2015] [Accepted: 11/16/2015] [Indexed: 12/16/2022] Open
Abstract
We demonstrate fluorescence imaging by two-photon excitation without scanning in biological specimens as previously described by Hwang and co-workers, but with an increased field size and with framing rates of up to 100 Hz. During recordings of synaptically-driven Ca(2+) events in primary rat hippocampal neurone cultures loaded with the fluorescent Ca(2+) indicator Fluo-4 AM, we have observed greatly reduced photo-bleaching in comparison with single-photon excitation. This method, which requires no costly additions to the microscope, promises to be useful for work where high time-resolution is required.
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Affiliation(s)
- Rumelo Amor
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
- * E-mail:
| | - Alison McDonald
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Johanna Trägårdh
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Gillian Robb
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Louise Wilson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Nor Zaihana Abdul Rahman
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - William Bradshaw Amos
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
- MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Trevor J. Bushell
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Gail McConnell
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
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17
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Abstract
OBJECTIVE Elucidation of neural activity underpinning rodent behaviour has traditionally been hampered by the use of tethered systems and human involvement. Furthermore the combination of deep-brain stimulation (DBS) and various neural recording modalities can lead to complex and time-consuming laboratory setups. For studies of this type, novel tools are required to drive forward this research. APPROACH A miniature wireless system weighing 8.5 g (including battery) was developed for rodent use that combined multichannel DBS and local-field potential (LFP) recordings. Its performance was verified in a working memory task that involved 4-channel fronto-hippocampal LFP recording and bilateral constant-current fimbria-fornix DBS. The system was synchronised with video-tracking for extraction of LFP at discrete task phases, and DBS was activated intermittently at discrete phases of the task. MAIN RESULTS In addition to having a fast set-up time, the system could reliably transmit continuous LFP at over 8 hours across 3-5 m distances. During the working memory task, LFP pertaining to discrete task phases was extracted and compared with well-known neural correlates of active exploratory behaviour in rodents. DBS could be wirelessly activated/deactivated at any part of the experiment during EEG recording and transmission, allowing for a seamless integration of this modality. SIGNIFICANCE The wireless system combines a small size with a level of robustness and versatility that can greatly simplify rodent behavioural experiments involving EEG recording and DBS. Designed for versatility and simplicity, the small size and low-cost of the system and its receiver allow for enhanced portability, fast experimental setup times, and pave the way for integration with more complex behaviour.
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Affiliation(s)
- R C Pinnell
- Department of Biomedical Engineering, University of Strathclyde, Glasgow, UK. Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
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Longhurst HJ, Tarzi MD, Ashworth F, Bethune C, Cale C, Dempster J, Gompels M, Jolles S, Seneviratne S, Symons C, Price A, Edgar D. C1 inhibitor deficiency: 2014 United Kingdom consensus document. Clin Exp Immunol 2015; 180:475-83. [PMID: 25605519 PMCID: PMC4449776 DOI: 10.1111/cei.12584] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2014] [Indexed: 12/18/2022] Open
Abstract
C1 inhibitor deficiency is a rare disorder manifesting with recurrent attacks of disabling and potentially life-threatening angioedema. Here we present an updated 2014 United Kingdom consensus document for the management of C1 inhibitor-deficient patients, representing a joint venture between the United Kingdom Primary Immunodeficiency Network and Hereditary Angioedema UK. To develop the consensus, we assembled a multi-disciplinary steering group of clinicians, nurses and a patient representative. This steering group first met in 2012, developing a total of 48 recommendations across 11 themes. The statements were distributed to relevant clinicians and a representative group of patients to be scored for agreement on a Likert scale. All 48 statements achieved a high degree of consensus, indicating strong alignment of opinion. The recommendations have evolved significantly since the 2005 document, with particularly notable developments including an improved evidence base to guide dosing and indications for acute treatment, greater emphasis on home therapy for acute attacks and a strong focus on service organization.
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Affiliation(s)
- H J Longhurst
- Department of Immunology, Barts Health NHS Trust and Medical Adviser HAE, UK
| | - M D Tarzi
- Department of Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - F Ashworth
- Department of Immunology, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK
| | - C Bethune
- Department of Immunology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | - C Cale
- Department of Immunology, Great Ormond Street Hospital for Children, London, UK
| | - J Dempster
- Department of Immunology, Barts Health NHS Trust and Medical Adviser HAE, UK
| | - M Gompels
- Department of Immunology, North Bristol NHS Trust, Bristol, UK
| | - S Jolles
- Department of Immunology, University Hospital of Wales, Cardiff, UK
| | - S Seneviratne
- Department of Immunology, Royal Free London NHS Trust, London, UK
| | - C Symons
- Department of Immunology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | - A Price
- Herditary Angioedema, UK (HAE UK)
| | - D Edgar
- UK Primary Immunodeficiency Network (UK PIN), Newcastle upon Tyne, UK
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19
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Trägårdh J, Robb G, Amor R, Amos WB, Dempster J, McConnell G. Exploration of the two-photon excitation spectrum of fluorescent dyes at wavelengths below the range of the Ti:Sapphire laser. J Microsc 2015; 259:210-8. [PMID: 25946127 PMCID: PMC4700633 DOI: 10.1111/jmi.12255] [Citation(s) in RCA: 18] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 03/20/2015] [Indexed: 11/28/2022]
Abstract
We have studied the wavelength dependence of the two-photon excitation efficiency for a number of common UV excitable fluorescent dyes; the nuclear stains DAPI, Hoechst and SYTOX Green, chitin- and cellulose-staining dye Calcofluor White and Alexa Fluor 350, in the visible and near-infrared wavelength range (540–800 nm). For several of the dyes, we observe a substantial increase in the fluorescence emission intensity for shorter excitation wavelengths than the 680 nm which is the shortest wavelength usually available for two-photon microscopy. We also find that although the rate of photo-bleaching increases at shorter wavelengths, it is still possible to acquire many images with higher fluorescence intensity. This is particularly useful for applications where the aim is to image the structure, rather than monitoring changes in emission intensity over extended periods of time. We measure the excitation spectrum when the dyes are used to stain biological specimens to get a more accurate representation of the spectrum of the dye in a cell environment as compared to solution-based measurements.
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Affiliation(s)
- J Trägårdh
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K
| | - G Robb
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K
| | - R Amor
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K
| | - W B Amos
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K.,MRC Laboratory of Molecular Biology, Cambridge, U.K
| | - J Dempster
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K
| | - G McConnell
- Centre for Biophotonics, Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, U.K
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20
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Duraisingham SS, Buckland M, Dempster J, Lorenzo L, Grigoriadou S, Longhurst HJ. Primary vs. secondary antibody deficiency: clinical features and infection outcomes of immunoglobulin replacement. PLoS One 2014; 9:e100324. [PMID: 24971644 PMCID: PMC4074074 DOI: 10.1371/journal.pone.0100324] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 05/23/2014] [Indexed: 12/04/2022] Open
Abstract
Secondary antibody deficiency can occur as a result of haematological malignancies or certain medications, but not much is known about the clinical and immunological features of this group of patients as a whole. Here we describe a cohort of 167 patients with primary or secondary antibody deficiencies on immunoglobulin (Ig)-replacement treatment. The demographics, causes of immunodeficiency, diagnostic delay, clinical and laboratory features, and infection frequency were analysed retrospectively. Chemotherapy for B cell lymphoma and the use of Rituximab, corticosteroids or immunosuppressive medications were the most common causes of secondary antibody deficiency in this cohort. There was no difference in diagnostic delay or bronchiectasis between primary and secondary antibody deficiency patients, and both groups experienced disorders associated with immune dysregulation. Secondary antibody deficiency patients had similar baseline levels of serum IgG, but higher IgM and IgA, and a higher frequency of switched memory B cells than primary antibody deficiency patients. Serious and non-serious infections before and after Ig-replacement were also compared in both groups. Although secondary antibody deficiency patients had more serious infections before initiation of Ig-replacement, treatment resulted in a significant reduction of serious and non-serious infections in both primary and secondary antibody deficiency patients. Patients with secondary antibody deficiency experience similar delays in diagnosis as primary antibody deficiency patients and can also benefit from immunoglobulin-replacement treatment.
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Affiliation(s)
| | - Matthew Buckland
- Immunology Department, Barts Health NHS Trust, London, United Kingdom
| | - John Dempster
- Immunology Department, Barts Health NHS Trust, London, United Kingdom
| | - Lorena Lorenzo
- Immunology Department, Barts Health NHS Trust, London, United Kingdom
| | - Sofia Grigoriadou
- Immunology Department, Barts Health NHS Trust, London, United Kingdom
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21
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Sandison M, Chalmers S, Dempster J, McCarron J. Direct visualisation of smooth muscle cell phenotypic plasticity and migration by long‐term imaging (867.12). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.867.12] [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)
- Mairi Sandison
- Strathclyde Institute of Pharmacy and Biomedical SciencesUniversity of Strathclyde GLASGOWUnited Kingdom
| | - Susan Chalmers
- Strathclyde Institute of Pharmacy and Biomedical SciencesUniversity of Strathclyde GLASGOWUnited Kingdom
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical SciencesUniversity of Strathclyde GLASGOWUnited Kingdom
| | - John McCarron
- Strathclyde Institute of Pharmacy and Biomedical SciencesUniversity of Strathclyde GLASGOWUnited Kingdom
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22
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Visvanathan V, Dempster J. Primary mediastinal B-cell lymphoma presenting as dysphagia: case report and literature review. Research (Wash D C) 2014. [DOI: 10.13070/rs.en.1.629] [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: 10/25/2022] Open
Affiliation(s)
- Vikranth Visvanathan
- ENT/Head and Neck surgery, West of Scotland, Crosshouse Hospital, Kilmarnock, KA2 0BE, United Kingdom
| | - John Dempster
- ENT/Head and Neck Surgeon, Crosshouse Hospital, Kilmarnock, KA2 OBE, United Kingdom
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23
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Jolles S, Williams P, Carne E, Mian H, Huissoon A, Wong G, Hackett S, Lortan J, Platts V, Longhurst H, Grigoriadou S, Dempster J, Deacock S, Khan S, Darroch J, Simon C, Thomas M, Pavaladurai V, Alachkar H, Herwadkar A, Abinun M, Arkwright P, Tarzi M, Helbert M, Bangs C, Pastacaldi C, Phillips C, Bennett H, El-Shanawany T. A UK national audit of hereditary and acquired angioedema. Clin Exp Immunol 2014; 175:59-67. [PMID: 23786259 DOI: 10.1111/cei.12159] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2013] [Indexed: 11/28/2022] Open
Abstract
Hereditary angioedema (HAE) and acquired angioedema (AAE) are rare life-threatening conditions caused by deficiency of C1 inhibitor (C1INH). Both are characterized by recurrent unpredictable episodes of mucosal swelling involving three main areas: the skin, gastrointestinal tract and larynx. Swelling in the gastrointestinal tract results in abdominal pain and vomiting, while swelling in the larynx may be fatal. There are limited UK data on these patients to help improve practice and understand more clearly the burden of disease. An audit tool was designed, informed by the published UK consensus document and clinical practice, and sent to clinicians involved in the care of HAE patients through a number of national organizations. Data sets on 376 patients were received from 14 centres in England, Scotland and Wales. There were 55 deaths from HAE in 33 families, emphasizing the potentially lethal nature of this disease. These data also show that there is a significant diagnostic delay of on average 10 years for type I HAE, 18 years for type II HAE and 5 years for AAE. For HAE the average annual frequency of swellings per patient affecting the periphery was eight, abdomen 5 and airway 0·5, with wide individual variation. The impact on quality of life was rated as moderate or severe by 37% of adult patients. The audit has helped to define the burden of disease in the UK and has aided planning new treatments for UK patients.
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Affiliation(s)
- S Jolles
- Department of Immunology, University Hospital of Wales, Cardiff, UK
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24
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Cookson EA, Conte IL, Dempster J, Hannah MJ, Carter T. Characterisation of Weibel-Palade body fusion by amperometry in endothelial cells reveals fusion pore dynamics and the effect of cholesterol on exocytosis. J Cell Sci 2013; 126:5490-9. [PMID: 24127569 PMCID: PMC3843139 DOI: 10.1242/jcs.138438] [Citation(s) in RCA: 11] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Regulated secretion from endothelial cells is mediated by Weibel-Palade body (WPB) exocytosis. Plasma membrane cholesterol is implicated in regulating secretory granule exocytosis and fusion pore dynamics; however, its role in modulating WPB exocytosis is not clear. To address this we combined high-resolution electrochemical analysis of WPB fusion pore dynamics, by amperometry, with high-speed optical imaging of WPB exocytosis following cholesterol depletion or supplementation in human umbilical vein endothelial cells. We identified serotonin (5-HT) immunoreactivity in WPBs, and VMAT1 expression allowing detection of secreted 5-HT as discrete current spikes during exocytosis. A high proportion of spikes (∼75%) had pre-spike foot signals, indicating that WPB fusion proceeds via an initial narrow pore. Cholesterol depletion significantly reduced pre-spike foot signal duration and increased the rate of fusion pore expansion, whereas cholesterol supplementation had broadly the reverse effect. Cholesterol depletion slowed the onset of hormone-evoked WPB exocytosis, whereas its supplementation increased the rate of WPB exocytosis and hormone-evoked proregion secretion. Our results provide the first analysis of WPB fusion pore dynamics and highlight an important role for cholesterol in the regulation of WPB exocytosis.
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Affiliation(s)
- Emma A Cookson
- MRC National Institute for Medical Research, Mill Hill, London, NW7 1AA, UK
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25
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Manson AL, Price A, Dempster J, Clinton-Tarestad P, Greening C, Enti R, Hill S, Grigoriadou S, Buckland MS, Longhurst HJ. In pursuit of excellence: an integrated care pathway for C1 inhibitor deficiency. Clin Exp Immunol 2013; 173:1-7. [PMID: 23607500 PMCID: PMC3694529 DOI: 10.1111/cei.12083] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [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] [Accepted: 01/18/2013] [Indexed: 01/22/2023] Open
Abstract
There are estimated to be approximately 1500 people in the United Kingdom with C1 inhibitor (C1INH) deficiency. At BartsHealth National Health Service (NHS) Trust we manage 133 patients with this condition and we believe that this represents one of the largest cohorts in the United Kingdom. C1INH deficiency may be hereditary or acquired. It is characterized by unpredictable episodic swellings, which may affect any part of the body, but are potentially fatal if they involve the larynx and cause significant morbidity if they involve the viscera. The last few years have seen a revolution in the treatment options that are available for C1 inhibitor deficiency. However, this occurs at a time when there are increased spending restraints in the NHS and the commissioning structure is being overhauled. Integrated care pathways (ICP) are a tool for disseminating best practice, for facilitating clinical audit, enabling multi-disciplinary working and for reducing health-care costs. Here we present an ICP for managing C1 inhibitor deficiency.
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Affiliation(s)
- A L Manson
- Department of Immunopathology, Barts Health NHS Trust, London, UK
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26
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Abstract
Hereditary angioedema is characterised by unpredictable, painful and potentially life-threatening oedema. Recently, some C1 inhibitors have been approved for self-administration and/or routine prevention, enabling patients to be proactive in managing their disease and reducing the burden of illness. This article discusses the effect of these advances from a specialist nurse's perspective.
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27
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Norris G, Amor R, Dempster J, Amos WB, McConnell G. Increased signals from short-wavelength-excited fluorescent molecules using sub-Ti:Sapphire wavelengths. J Microsc 2012; 248:200-7. [PMID: 23078118 PMCID: PMC3746106 DOI: 10.1111/j.1365-2818.2012.03663.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 03/11/2012] [Accepted: 08/14/2012] [Indexed: 11/28/2022]
Abstract
We report the use of an all-solid-state ultrashort pulsed source specifically for two-photon microscopy at wavelengths shorter than those of the conventional Ti:Sapphire laser. Our approach involves sum-frequency mixing of the output from an optical parametric oscillator (λ= 1400-1640 nm) synchronously pumped by a Yb-doped fibre laser (λ= 1064 nm), with the residual pump radiation. This generated an fs-pulsed output tunable in the red spectral region (λ= 620-636 nm, ~150 mW, 405 fs, 80 MHz, M(2) ~ 1.3). We demonstrate the performance of our ultrashort pulsed system using fluorescently labelled and autofluorescent tissue, and compare with conventional Ti:Sapphire excitation. We observe a more than 3-fold increase in fluorescence signal intensity using our visible laser source in comparison with the Ti:Sapphire laser for two-photon excitation at equal illumination peak powers of 1.16 kW or less.
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Affiliation(s)
- G Norris
- Centre for Biophotonics, SIPBS, University of Strathclyde, Glasgow, UK
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28
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Amor R, Norris G, Dempster J, Amos WB, McConnell G. A compact instrument for adjusting laser beams to be accurately coincident and coaxial and its use in biomedical imaging using wave-mixed laser sources. Rev Sci Instrum 2012; 83:083705. [PMID: 22938301 DOI: 10.1063/1.4745373] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Biomedical imaging applications that involve nonlinear optical processes such as sum-frequency generation (SFG) and four-wave mixing require that the pulses are synchronized in time and the beams are coaxial to better than 400 μrad. For this reason, folding mirrors are normally used to extend the beam path over a few meters so that detectors can be put into the beams to check their overlap at the start of a long path and also at the end of it. We have made a portable instrument with a footprint of only 22 cm × 11 cm × 16 cm that uses a short focal length lens and a telephoto combination for viewing the near-field and far-field simultaneously. Our instrument is simple to build and use, and we show its application in coherent anti-Stokes Raman scattering microscopy and SFG-based two-photon fluorescence microscopy.
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Affiliation(s)
- R Amor
- Centre for Biophotonics, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom.
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29
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Workman AJ, Marshall GE, Rankin AC, Smith GL, Dempster J. Transient outward K+ current reduction prolongs action potentials and promotes afterdepolarisations: a dynamic-clamp study in human and rabbit cardiac atrial myocytes. J Physiol 2012; 590:4289-305. [PMID: 22733660 DOI: 10.1113/jphysiol.2012.235986] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Human atrial transient outward K(+) current (I(TO)) is decreased in a variety of cardiac pathologies, but how I(TO) reduction alters action potentials (APs) and arrhythmia mechanisms is poorly understood, owing to non-selectivity of I(TO) blockers. The aim of this study was to investigate effects of selective I(TO) changes on AP shape and duration (APD), and on afterdepolarisations or abnormal automaticity with β-adrenergic-stimulation, using the dynamic-clamp technique in atrial cells. Human and rabbit atrial cells were isolated by enzymatic dissociation, and electrical activity recorded by whole-cell-patch clamp (35-37°C). Dynamic-clamp-simulated I(TO) reduction or block slowed AP phase 1 and elevated the plateau, significantly prolonging APD, in both species. In human atrial cells, I(TO) block (100% I(TO) subtraction) increased APD(50) by 31%, APD(90) by 17%, and APD(-61 mV) (reflecting cellular effective refractory period) by 22% (P < 0.05 for each). Interrupting I(TO) block at various time points during repolarisation revealed that the APD(90) increase resulted mainly from plateau-elevation, rather than from phase 1-slowing or any residual I(TO). In rabbit atrial cells, partial I(TO) block (∼40% I(TO) subtraction) reversibly increased the incidence of cellular arrhythmic depolarisations (CADs; afterdepolarisations and/or abnormal automaticity) in the presence of the β-agonist isoproterenol (0.1 μm; ISO), from 0% to 64% (P < 0.05). ISO-induced CADs were significantly suppressed by dynamic-clamp increase in I(TO) (∼40% I(TO) addition). ISO+I(TO) decrease-induced CADs were abolished by β(1)-antagonism with atenolol at therapeutic concentration (1 μm). Atrial cell action potential changes from selective I(TO) modulation, shown for the first time using dynamic-clamp, have the potential to influence reentrant and non-reentrant arrhythmia mechanisms, with implications for both the development and treatment of atrial fibrillation.
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Affiliation(s)
- A J Workman
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA, UK.
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McDonald A, Harris J, MacMillan D, Dempster J, McConnell G. Light-induced Ca(2+) transients observed in widefield epi-fluorescence microscopy of excitable cells. Biomed Opt Express 2012; 3:1266-1273. [PMID: 22741073 PMCID: PMC3370967 DOI: 10.1364/boe.3.001266] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/25/2012] [Accepted: 04/25/2012] [Indexed: 05/30/2023]
Abstract
We have investigated the possibility that variations in the level of intracellular Ca(2+) in excitable cells might be induced as an artifact of the incoherent illumination that is being used to monitor transient responses. In order to avoid the fluctuations in power of an arc lamp source, a microscope using a light emitting diode that was calibrated accurately at low power levels, was constructed to provide good control over the dose of light applied to the biological specimen. We report here that higher powers of illumination increased the probability of occurrence of Ca(2+) transients even in the sub-mW range normally used to measure such transients in epi-fluorescence work, suggesting that caution should be exercised when designing experiments and interpreting data.
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Abstract
We report three-photon laser scanning microscopy (3PLSM) using a bi-directional pumped optical parametric oscillator (OPO) with signal wavelength output at λ= 1500 nm. This novel laser was used to overcome the high optical loss in the infrared spectral region observed in laser scanning microscopes and objective lenses that renders them otherwise difficult to use for imaging. To test our system, we performed 3PLSM auto-fluorescence imaging of live plant cells at λ= 1500 nm, specifically Spirogyra, and compared performance with two-photon excitation (2PLSM) imaging using a femtosecond pulsed Ti:Sapphire laser at λ= 780 nm. Analysis of cell viability based on cytoplasmic organelle streaming and structural changes of cells revealed that at similar peak powers, 2PLSM caused gross cell damage after 5 min but 3PLSM showed little or no interference with cell function after 15 min. The λ= 1500 nm OPO is thus shown to be a practical laser source for live cell imaging.
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Affiliation(s)
- Greg Norris
- Centre for Biophotonics, SIPBS, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, United Kingdom
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32
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Cookson EA, Dempster J, Hannah MJ, Carter T. Properties of the Weibel-Palade Body Fusion Pore. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.1741] [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: 10/14/2022] Open
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Kueh S, Dempster J, Head S, Morley J. Reduced postsynaptic GABAA receptor number and enhanced gaboxadol induced change in holding currents in Purkinje cells of the dystrophin-deficient mdx mouse. Neurobiol Dis 2011; 43:558-64. [DOI: 10.1016/j.nbd.2011.05.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 04/18/2011] [Accepted: 05/05/2011] [Indexed: 10/18/2022] Open
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Longhurst HJ, Farkas H, Craig T, Aygören-Pürsün E, Bethune C, Bjorkander J, Bork K, Bouillet L, Boysen H, Bygum A, Caballero T, Cicardi M, Dempster J, Gompels M, Gooi J, Grigoriadou S, Huffer U, Kreuz W, Levi MM, Long J, Martinez-Saguer I, Raguet M, Reshef A, Bowen T, Zuraw B. HAE international home therapy consensus document. Allergy Asthma Clin Immunol 2010; 6:22. [PMID: 20667125 PMCID: PMC2922091 DOI: 10.1186/1710-1492-6-22] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/29/2010] [Accepted: 07/28/2010] [Indexed: 11/10/2022]
Abstract
Hereditary angioedema (C1 inhibitor deficiency, HAE) is associated with intermittent swellings which are disabling and may be fatal. Effective treatments are available and these are most useful when given early in the course of the swelling. The requirement to attend a medical facility for parenteral treatment results in delays. Home therapy offers the possibility of earlier treatment and better symptom control, enabling patients to live more healthy, productive lives. This paper examines the evidence for patient-controlled home treatment of acute attacks ('self or assisted administration') and suggests a framework for patients and physicians interested in participating in home or self-administration programmes. It represents the opinion of the authors who have a wide range of expert experience in the management of HAE.
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Affiliation(s)
| | - Henriette Farkas
- 3rd Department of Internal Medicine, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Timothy Craig
- Departments of Medicine and Pediatrics, Penn State University, Hershey, Pennsylvania, USA
| | | | - Claire Bethune
- Department of Immunology, Plymouth Hospitals NHS Trust, UK
| | - Janne Bjorkander
- Dept of Internal Medicin, Ryhov County Hospital, SE-55185 Jönköping, Sweden
| | - Konrad Bork
- Department of Dermatology, University Hospital of the Johannes Gutenberg-University of Mainz, Mainz, Germany
| | | | | | - Anette Bygum
- Department of Dermatology and Allergy Centre, Odense University Hospital, Denmark
| | | | - Marco Cicardi
- Department of Internal Medicine, Universita degli Studi di Milano, Ospedale L. Sacco, Milan, Italy
| | - John Dempster
- Department of Immunology, Barts and the London NHS Trust, London, UK
| | - Mark Gompels
- Department of Immunology, Southmead Hospital, Bristol, UK
| | - Jimmy Gooi
- Department of Immunology, St James' Hospital, Leeds, UK
| | - Sofia Grigoriadou
- Department of Immunology, Barts and the London NHS Trust, London, UK
| | | | - Wolfhart Kreuz
- Johann Wolfgang Goethe University, Frankfurt/Main, Germany
| | - Marcel M Levi
- Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
| | - Janet Long
- US HAEA Executive Vice President; US HAEA Patient Registry, USA
| | | | | | - Avner Reshef
- Tel Hashomer, and Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Israel
| | - Tom Bowen
- Departments of Medicine and Paediatrics, University of Calgary, Calgary, Alberta, Canada
| | - Bruce Zuraw
- University of California, San Diego, San Diego, California, USA
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Schuchardt M, Toelle M, Huang T, Wiedon A, Van Der Giet M, Mill C, George S, Jeremy J, Santulli G, Illario M, Cipolletta E, Sorriento D, Del Giudice C, Anastasio A, Trimarco B, Iaccarino G, Jobs A, Wagner C, Kurtz A, De Wit C, Koller A, Suvorava T, Weber M, Dao V, Kojda G, Tsaousi A, Lyon C, Williams H, George S, Barth N, Loot A, Fleming I, Keul P, Lucke S, Graeler M, Heusch G, Levkau B, Biessen E, De Jager S, Bermudez-Pulgarin B, Bot I, Abia R, Van Berkel T, Renger A, Noack C, Zafiriou M, Dietz R, Bergmann M, Zelarayan L, Hammond J, Hamelet J, Van Assche T, Belge C, Vanderper A, Langin D, Herijgers P, Balligand J, Perrot A, Neubert M, Dietz R, Posch M, Oezcelik C, Posch M, Waldmuller S, Perrot A, Berger F, Scheffold T, Bouvagnet P, Ozcelik C, Lebreiro A, Martins E, Lourenco P, Cruz C, Martins M, Bettencourt P, Maciel M, Abreu-Lima C, Pilichou K, Bauce B, Rampazzo A, Carturan E, Corrado D, Thiene G, Basso C, Piccini I, Fortmueller L, Kuhlmann M, Schaefers M, Carmeliet P, Kirchhof P, Fabritz L, Sanchez J, Rodriguez-Sinovas A, Agullo E, Garcia-Dorado D, Lymperopoulos A, Rengo G, Gao E, Zincarelli C, Koch W, Fontes-Sousa A, Silva S, Gomes M, Ferreira P, Leite-Moreira A, Capuano V, Ferron L, Ruchon Y, Ben Mohamed F, Renaud JF, Morgan P, Falcao-Pires I, Goncalves N, Gavina C, Pinho S, Moura C, Amorim M, Pinho P, Leite-Moreira A, Christ T, Molenaar P, Diez A, Ravens U, Kaumann A, Kletsiou E, Giannakopoulou M, Bozas E, Iliodromitis E, Anastasiou-Nana M, Papathanassoglou E, Chottova Dvorakova M, Mistrova E, Perez N, Slavikova J, Hynie S, Sida P, Klenerova V, Massaro M, Scoditti E, Carluccio M, Storelli C, Distante A, De Caterina R, Cingolani H, Zakrzewicz A, Hoffmann C, Hohberg M, Chlench S, Maroski J, Drab M, Siegel G, Pries A, Farrell K, Holt C, Zahradnikova A, Schrot G, Ibatov A, Wilck N, Fechner M, Arias A, Meiners S, Baumann G, Stangl V, Stangl K, Ludwig A, Polakova E, Christ A, Eijgelaar W, Daemen M, Li X, Penfold M, Schall T, Weber C, Schober A, Hintenberger R, Kaun C, Zahradnik I, Pfaffenberger S, Maurer G, Huber K, Wojta J, Demyanets S, Titov V, Nazari-Jahantigh M, Weber C, Schober A, Chin-Dusting J, Zahradnikova A, Vaisman B, Khong S, Remaley A, Andrews K, Hoeper A, Khalid A, Fuglested B, Aasum E, Larsen T, Titov V, Fluschnik N, Carluccio M, Scoditti E, Massaro M, Storelli C, Distante A, De Caterina R, Diebold I, Petry A, Djordjevic T, Belaiba R, Sossalla S, Fratz S, Hess J, Kietzmann T, Goerlach A, O'shea K, Chess D, Khairallah R, Walsh K, Stanley W, Falcao-Pires I, Ort K, Goncalves N, Van Der Velden J, Moreira-Goncalves D, Paulus W, Niessen H, Perlini S, Leite-Moreira A, Azibani F, Tournoux F, Fazal L, Neef S, Polidano E, Merval R, Chatziantoniou C, Samuel J, Delcayre C, Azibani F, Tournoux F, Fazal L, Polidano E, Merval R, Hasenfuss G, Chatziantoniou C, Samuel J, Delcayre C, Mgandela P, Brooksbank R, Maswanganyi T, Woodiwiss A, Norton G, Makaula S, Sartiani L, Maier L, Bucciantini M, Spinelli V, Coppini R, Russo E, Mugelli A, Cerbai E, Stefani M, Sukumaran V, Watanabe K, Ma M, Weinert S, Thandavarayan R, Azrozal W, Sari F, Shimazaki H, Kobayashi Y, Roleder T, Golba K, Deja M, Malinowski M, Wos S, Poitz D, Stieger P, Grebe M, Tillmanns H, Preissner K, Sedding D, Ercan E, Guven A, Asgun F, Ickin M, Ercan F, Herold J, Kaplan A, Yavuz O, Bagla S, Yang Y, Ma Y, Liu F, Li X, Huang Y, Kuka J, Vilskersts R, Schmeisser A, Vavers E, Liepins E, Dambrova M, Mariero L, Rutkovskiy A, Stenslokken K, Vaage J, Duerr G, Suchan G, Heuft T, Strasser J, Klaas T, Zimmer A, Welz A, Fleischmann B, Dewald O, Voelkl J, Haubner B, Kremser C, Mayr A, Klug G, Braun-Dullaeus R, Reiner M, Pachinger O, Metzler B, Pisarenko O, Shulzhenko V, Pelogeykina Y, Khatri D, Studneva I, Barnucz E, Loganathan S, Nazari-Jahantigh M, Hirschberg K, Korkmaz S, Merkely B, Karck M, Szabo G, Bencsik P, Gorbe A, Kocsis G, Csonka C, Csont T, Weber C, Shamloo M, Woodburn K, Ferdinandy P, Szucs G, Kupai K, Csonka C, Csont C, Ferdinandy P, Kocsisne Fodor G, Bencsik P, Schober A, Fekete V, Varga Z, Monostori P, Turi S, Ferdinandy P, Csont T, Leuner A, Eichhorn B, Ravens U, Morawietz H, Babes E, Babes V, Popescu M, Ardelean A, Rus M, Bustea C, Gwozdz P, Csanyi G, Luzak B, Gajda M, Mateuszuk L, Chmura-Skirlinska A, Watala C, Chlopicki S, Kierzkowska I, Sulicka J, Kwater A, Strach M, Surdacki A, Siedlar M, Grodzicki T, Olieslagers S, Pardali L, Tchaikovski V, Ten Dijke P, Waltenberger J, Renner M, Redwan B, Winter M, Panzenboeck A, Jakowitsch J, Sadushi-Kolici R, Bonderman D, Lang I, Toso A, Tanini L, Pizzetti T, Leoncini M, Maioli M, Tedeschi D, Oliviero C, Bellandi F, Toso A, Tanini L, Pizzetti T, Leoncini M, Maioli M, Tedeschi D, Casprini P, Bellandi F, Toso A, Tanini L, Pizzetti T, Leoncini M, Maioli M, Tedeschi D, Amato M, Bellandi F, Molins B, Pena E, Badimon L, Ferreiro Gutierrez J, Ueno M, Alissa R, Dharmashankar K, Capodanno D, Desai B, Bass T, Angiolillo D, Chabielska E, Gromotowicz A, Szemraj J, Stankiewicz A, Zakrzeska A, Mohammed S, Molla F, Soldo A, Russo I, Germano G, Balconi G, Staszewsky L, Latini R, Lynch F, Austin C, Prendergast B, Keenan D, Malik R, Izzard A, Heagerty A, Czikora A, Lizanecz E, Rutkai I, Boczan J, Porszasz R, Papp Z, Edes I, Toth A, Colantuoni A, Vagnani S, Lapi D, Maroz-Vadalazhskaya N, Koslov I, Shumavetz V, Glibovskaya T, Ostrovskiy Y, Koutsiaris A, Tachmitzi S, Kotoula M, Giannoukas A, Tsironi E, Rutkai I, Czikora A, Darago A, Orosz P, Megyesi Z, Edes I, Papp Z, Toth A, Eichhorn B, Schudeja S, Matschke K, Deussen A, Ravens U, Castro M, Cena J, Walsh M, Schulz R, Poddar K, Rha S, Ramasamy S, Park J, Choi C, Seo H, Park C, Oh D, Lebreiro A, Martins E, Almeida J, Pimenta S, Bernardes J, Machado J, Abreu-Lima C, Sabatasso S, Laissue J, Hlushchuk R, Brauer-Krisch E, Bravin A, Blattmann H, Michaud K, Djonov V, Hirschberg K, Tarcea V, Pali S, Korkmaz S, Loganathan S, Merkely B, Karck M, Szabo G, Pagliani L, Faggin E, Rattazzi M, Puato M, Presta M, Grego F, Deriu G, Pauletto P, Kaiser R, Albrecht K, Schgoer W, Theurl M, Beer A, Wiedemann D, Steger C, Bonaros N, Kirchmair R, Kharlamov A, Cabaravdic M, Breuss J, Uhrin P, Binder B, Fiordaliso F, Balconi G, Mohammed S, Maggioni M, Biondi A, Masson S, Cervo L, Latini R, Francke A, Herold J, Soenke W, Strasser R, Braun-Dullaeus R, Hecht N, Vajkoczy P, Woitzik J, Hackbusch D, Gatzke N, Duelsner A, Tsuprykov O, Slavic S, Buschmann I, Kappert K, Massaro M, Scoditti E, Carluccio M, Storelli C, Distante A, De Caterina R, Barandi L, Harmati G, Simko J, Horvath B, Szentandrassy N, Banyasz T, Magyar J, Nanasi P, Kaya A, Uzunhasan I, Yildiz A, Yigit Z, Turkoglu C, Doisne N, Zannad N, Hivert B, Cosnay P, Maupoil V, Findlay I, Virag L, Kristof A, Koncz I, Szel T, Jost N, Biliczki P, Papp J, Varro A, Bukowska A, Skopp K, Hammwoehner M, Huth C, Bode-Boeger S, Goette A, Workman A, Dempster J, Marshall G, Rankin A, Revnic C, Ginghina C, Revnic F, Yakushev S, Petrushanko I, Makhro A, Segato Komniski M, Mitkevich V, Makarov A, Gassmann M, Bogdanova A, Rutkovskiy A, Mariero L, Stenslokken K, Valen G, Vaage J, Dizayee S, Kaestner S, Kuck F, Piekorz R, Hein P, Matthes J, Nurnberg B, Herzig S, Hertel F, Switalski A, Bender K, Kienitz MC, Pott L, Fornai L, Angelini A, Erika Amstalden Van Hove E, Fedrigo M, Thiene G, Heeren R, Kruse M, Pongs O, Lehmann H, Martens-Lobenhoffer J, Hammwoehner M, Roehl F, Bukowska A, Bode-Boeger S, Goette A, Radicke S, Cotella C, Sblattero D, Schaefer M, Ravens U, Wettwer E, Santoro C, Seyler C, Kulzer M, Zitron E, Scholz E, Welke F, Thomas D, Karle C, Schmidt K, Radicke S, Dobrev D, Ravens U, Wettwer E, Houshmand N, Menesi D, Ravens U, Wettwer E, Cotella D, Papp J, Varro A, Szuts V, Szuts V, Houshmand N, Puskas L, Jost N, Virag L, Kiss I, Deak F, Varro A, Tereshchenko S, Gladyshev M, Kalachova G, Syshchik N, Gogolashvili N, Dedok E, Evert L, Wenzel J, Brandenburger M, Bogdan R, Richardt D, Reppel M, Hescheler J, Dendorfer A, Terlau H, Wiegerinck R, Galvez-Monton C, Jorge E, Martinez R, Ricart E, Cinca J, Bagavananthem Andavan G, Lemmens Gruber R, Brack K, Coote J, Ng G, Daimi H, Haj Khelil A, Neji A, Ben Hamda K, Maaoui S, Aranega A, Chibani J, Franco Jaime D, Tanko AS, Brack K, Coote J, Ng G, Doisne N, Hivert B, Cosnay P, Findlay I, Maupoil V, Daniel JM, Bielenberg W, Stieger P, Tillmanns H, Sedding D, Fortini C, Toffoletto B, Fucili A, Beltrami A, Fiorelli V, Francolini G, Ferrari R, Beltrami C, Castellani C, Ravara B, Tavano R, Thiene G, Vettor R, De Coppi P, Papini E, Angelini A, Molla F, Soldo A, Biondi A, Staszewsky L, Russo I, Gunetti M, Fagioli F, Latini R, Suffredini S, Sartiani L, Stillitano F, Mugelli A, Cerbai E, Krausgrill B, Halbach M, Soemantri S, Schenk K, Lange N, Hescheler J, Saric T, Muller-Ehmsen J, Kavanagh D, Zhao Y, Yemm A, Kalia N, Wright E, Farrell K, Wallrapp C, Geigle P, Lewis A, Stratford P, Malik N, Holt C, Krausgrill B, Raths M, Halbach M, Schenk K, Hescheler J, Muller-Ehmsen J, Zagallo M, Luni C, Serena E, Cimetta E, Zatti S, Giobbe G, Elvassore N, Serena E, Cimetta E, Zaglia T, Zatti S, Zambon A, Gordon K, Elvassore N, Mioulane M, Foldes G, Ali N, Harding S, Gorbe A, Szunyog A, Varga Z, Pirity M, Rungaruniert S, Dinnyes A, Csont T, Ferdinandy P, Foldes G, Mioulane M, Iqbal A, Schneider MD, Ali N, Harding S, Babes E, Babes V, Khodjaeva E, Ibadov R, Khalikulov K, Mansurov A, Astvatsatryan A, Senan M, Astvatsatryan A, Senan M, Nemeth A, Lenkey Z, Ajtay Z, Cziraki A, Sulyok E, Horvath I, Lobenhoffer J, Bode-Boger S, Li J, He Y, Yang X, Wang F, Xu H, Li X, Zhao X, Lin Y, Juszynski M, Ciszek B, Jablonska A, Stachurska E, Ratajska A, Atkinson A, Inada S, Li J, Sleiman R, Zhang H, Boyett M, Dobrzynski H, Fedorenko O, Hao G, Atkinson A, Yanni J, Buckley D, Anderson R, Boyett M, Dobrzynski H, Ma Y, Ma X, Hu Y, Yang Y, Huang D, Liu F, Huang Y, Liu C, Jedrzejczyk T, Balwicki L, Wierucki L, Zdrojewski T, Makhro A, Agarkova I, Vogel J, Gassmann M, Bogdanova A, Korybalska K, Pyda M, Witowski J, Ibatov A, Sozmen N, Seymen A, Tuncay E, Turan B, Huang Y, Ma Y, Yang Y, Liu F, Chen B, Li X, Houston-Feenstra L, Chiong JR, Jutzy K, Furundzija V, Kaufmann J, Kappert K, Meyborg H, Fleck E, Stawowy P, Ksiezycka-Majczynska E, Lubiszewska B, Kruk M, Kurjata P, Ruzyllo W, Ibatov A, Driesen R, Coenen T, Fagard R, Sipido K, Petrov V, Aksentijevic D, Lygate C, Makinen K, Sebag-Montefiore L, Medway D, Schneider J, Neubauer S, Gasser R, Holzwart E, Rainer P, Von Lewinski D, Maechler H, Gasser S, Roessl U, Pieske B, Krueger J, Kintscher U, Kappert K, Podramagi T, Paju K, Piirsoo A, Roosimaa M, Kadaja L, Orlova E, Ruusalepp A, Seppet E, Auquier J, Ginion A, Hue L, Horman S, Beauloye C, Vanoverschelde J, Bertrand L, Fekete V, Zvara A, Pipis J, Konya C, Csonka C, Puskas L, Csont T, Ferdinandy P, Gasser S, Rainer P, Holzwart E, Roessl U, Kraigher-Krainer E, Von Lewinksi D, Pieske B, Gasser R, Gonzalez-Loyola A, Barba I, Rodriguez-Sinovas A, Fernandez-Sanz C, Agullo E, Ruiz-Meana M, Garcia-Dorado D, Forteza M, Bodi Peris V, Monleon D, Mainar L, Morales J, Moratal D, Trapero I, Chorro F, Leszek P, Sochanowicz B, Szperl M, Kolsut P, Piotrowski W, Rywik T, Danko B, Kruszewski M, Stanley W, Khairallah R, Khanna N, O'shea K, Kristian T, Hecker P, Des Rosiers R, Fiskum G, Fernandez-Alfonso M, Guzman-Ruiz R, Somoza B, Gil-Ortega M, Attane C, Castan-Laurell I, Valet P, Ruiz-Gayo M, Maroz-Vadalazhskaya N, Denissevich T, Shumavetz V, Ostrovskiy Y, Schrepper A, Schwarzer M, Amorim P, Schoepe M, Mohr F, Doenst T, Chiellini G, Ghelardoni S, Saba A, Marchini M, Frascarelli S, Raffaelli A, Scanlan T, Zucchi R, Van Den Akker N, Molin D, Kolk F, Jeukens F, Olde Engberink R, Waltenberger J, Post M, Van Den Akker N, Molin D, Verbruggen S, Schulten H, Post M, Waltenberger J, Rochais F, Kelly R, Aberg M, Johnell M, Wickstrom M, Siegbahn A, Dimitrakis P, Groppalli V, Ott D, Seifriz F, Suter T, Zuppinger C, Kashcheyeu Y, Mueller R, Wiesen M, Saric T, Gruendemann D, Hescheler J, Herzig S, Falcao-Pires I, Fontes-Sousa A, Lopes-Conceicao L, Bras-Silva C, Leite-Moreira A, Bukauskas F, Palacios-Prado N, Norheim F, Raastad T, Thiede B, Drevon C, Haugen F, Lindner D, Westermann D, Zietsch C, Schultheiss HP, Tschoepe C, Horn M, Graham H, Hall M, Richards M, Clarke J, Dibb K, Trafford A, Cheng CF, Lin H, Eigeldiger-Berthou S, Buntschu P, Frobert A, Flueck M, Tevaearai H, Kadner A, Mikhailov A, Torrado M, Centeno A, Lopez E, Lourido L, Castro Beiras A, Popov T, Srdanovic I, Petrovic M, Canji T, Kovacevic M, Jovelic A, Sladojevic M, Panic G, Kararigas G, Fliegner D, Regitz-Zagrosek V, De La Rosa Sanchez A, Dominguez J, Sedmera D, Franco D, Aranega A, Medunjanin S, Burgbacher F, Schmeisser A, Strasser R, Braun-Dullaeus R, Li X, Ma Y, Yang Y, Liu F, Han W, Chen B, Zhang J, Gao X, Bayliss C, Song W, Stuckey D, Dyer E, Leung MC, Monserrat L, Marston S, Sorriento D, Santulli G, Fusco A, Trimarco B, Iaccarino G, Revnic C, Ginghina C, Revnic F, Paillard M, Liang J, Strub G, Gomez L, Hait N, Allegood J, Lesnefsky E, Spiegel S, Zuchi C, Coiro S, Bettini M, Ciliberti G, Mancini I, Tritto I, Becker L, Ambrosio G, Adam T, Sharp S, Opie L, Lecour S, Khaliulin I, Parker J, Halestrap A, Kandasamy A, Schulz R, Schoepe M, Schwarzer M, Schrepper A, Osterholt M, Amorim P, Mohr F, Doenst T, Fernandez-Sanz C, Ruiz-Meana M, Miro-Casas E, Agullo E, Boengler K, Schulz R, Garcia-Dorado D, Menazza S, Canton M, Sheeran F, Di Lisa F, Pepe S, Borchi E, Manni M, Bargelli V, Giordano C, D'amati G, Cerbai E, Nediani C, Raimondi L, Micova P, Balkova P, Kolar F, Neckar J, Novak F, Novakova O, Schuchardt M, Toelle M, Pruefer N, Pruefer J, Jankowski V, Jankowski J, Van Der Giet M, Han W, Su Y, Zervou S, Aksentijevic D, Lygate C, Neubauer S, Seidel B, Korkmaz S, Radovits T, Hirschberg K, Loganathan S, Barnucz E, Karck M, Szabo G, Aggeli I, Kefaloyianni E, Beis I, Gaitanaki C, Lacerda L, Somers S, Opie L, Lecour S, Brack K, Coote J, Ng G, Paur H, Nikolaev V, Lyon A, Harding S, Bras-Silva C. Sunday, 18 July 2010. Cardiovasc Res 2010. [DOI: 10.1093/cvr/cvq176] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Gelman AE, Li W, Richardson SB, Zinselmeyer BH, Lai J, Okazaki M, Kornfeld CG, Kreisel FH, Sugimoto S, Tietjens JR, Dempster J, Patterson GA, Krupnick AS, Miller MJ, Kreisel D. Cutting edge: Acute lung allograft rejection is independent of secondary lymphoid organs. J Immunol 2009; 182:3969-73. [PMID: 19299693 DOI: 10.4049/jimmunol.0803514] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
It is the prevailing view that adaptive immune responses are initiated in secondary lymphoid organs. Studies using alymphoplastic mice have shown that secondary lymphoid organs are essential to initiate allograft rejection of skin, heart, and small bowel. The high immunogenicity of lungs is well recognized and allograft rejection remains a major contributing factor to poor outcomes after lung transplantation. We show in this study that alloreactive T cells are initially primed within lung allografts and not in secondary lymphoid organs following transplantation. In contrast to other organs, lungs are acutely rejected in the absence of secondary lymphoid organs. Two-photon microscopy revealed that recipient T cells cluster predominantly around lung-resident, donor-derived CD11c(+) cells early after engraftment. These findings demonstrate for the first time that alloimmune responses following lung transplantation are initiated in the graft itself and therefore identify a novel, potentially clinically relevant mechanism of lung allograft rejection.
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Affiliation(s)
- Andrew E Gelman
- Department of Surgery, Washington University, St. Louis, MO 63110, USA
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Babich V, Knipe L, Hewlett L, Meli A, Dempster J, Hannah MJ, Carter T. Differential effect of extracellular acidosis on the release and dispersal of soluble and membrane proteins secreted from the Weibel-Palade body. J Biol Chem 2009; 284:12459-68. [PMID: 19258324 DOI: 10.1074/jbc.m809235200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [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
Proteins secreted from Weibel-Palade bodies (WPBs) play important roles in regulating inflammatory and hemostatic responses. Inflammation is associated with the extracellular acidification of tissues and blood, conditions that can alter the behavior of secreted proteins. The effect of extracellular pH (pH(o)) on the release of von Willebrand factor (VWF), the VWF-propolypeptide (Proregion), interleukin-8, eotaxin-3, P-selectin, and CD63 from WPBs was investigated using biochemical approaches and by direct optical analysis of individual WPB fusion events in human endothelial cells expressing green or red fluorescent fusions of these different cargo proteins. Between pH(o) 7.4 and 7.0, ionomycin-evoked WPB exocytosis was characterized by the adhesion of VWF to the cell surface and the formation of long filamentous strands. The rapid dispersal of Proregion, interleukin-8, and eotaxin-3 into solution, and of P-selectin and CD63 into the plasma membrane, was unaltered over this pH(o) range. At pH(o) 6.8 or lower, Proregion remained associated with VWF, in many cases WPB failed to collapse fully and VWF failed to form filamentous strands. At pH(o) 6.5 dispersal of interleukin-8, eotaxin-3, and the membrane protein CD63 remained unaltered compared with that at pH(o) 7.4; however, P-selectin dispersal into the plasma membrane was significantly slowed. Thus, extracellular acidification to levels of pH(o) 6.8 or lower significantly alters the behavior of secreted VWF, Proregion, and P-selectin while rapid release of the small pro-inflammatory mediators IL-8 and eotaxin-3 is essentially unaltered. Together, these data suggest that WPB exocytosis during extracellular acidosis may favor the control of inflammatory processes.
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Affiliation(s)
- Victor Babich
- MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
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Zinselmeyer BH, Dempster J, Wokosin DL, Cannon JJ, Pless R, Parker I, Miller MJ. Chapter 16. Two-photon microscopy and multidimensional analysis of cell dynamics. Methods Enzymol 2009; 461:349-78. [PMID: 19480927 DOI: 10.1016/s0076-6879(09)05416-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [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: 11/17/2022]
Abstract
Two-photon (2P) microscopy is a high-resolution imaging technique that was initially applied by neurobiologists and developmental cell biologists but has subsequently been broadly adapted by immunologists. The value of 2P microscopy is that it affords an unparalleled view of single-cell spatiotemporal dynamics deep within intact tissues and organs. As the technology develops and new transgenic mice and fluorescent probes become available, 2P microscopy will serve as an increasingly valuable tool for assessing cell function and probing molecular mechanisms. Here we discuss the technical aspects related to 2P microscope design, explain in detail various tissue imaging preparations, and walk the reader through the often daunting process of analyzing multidimensional data sets and presenting the experimental results.
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Affiliation(s)
- Bernd H Zinselmeyer
- Washington University School of Medicine, Department of Pathology and Immunology, St. Louis, Missouri, USA
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Farkas A, Dempster J, Coker SJ. Importance of vagally mediated bradycardia for the induction of torsade de pointes in an in vivo model. Br J Pharmacol 2008; 154:958-70. [PMID: 18587444 DOI: 10.1038/bjp.2008.154] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND AND PURPOSE Bradycardia is a risk factor for the development of torsade de pointes (TdP). The aim of this work was to compare the importance of changes in heart rate and arterial blood pressure in the development of drug-induced TdP and to investigate the role of vagal influences. EXPERIMENTAL APPROACH Experiments were performed in open-chest, pentobarbital-anaesthetized, male rabbits which were given clofilium (20, 60 and 200 nmol kg(-1) min(-1)) with rising doses of either phenylephrine (75, 150, 225 and 300 nmol kg(-1) min(-1)), angiotensin II (0.25, 0.5, 0.75 and 1 nmol kg(-1) min(-1)) or saline. A fourth group received phenylephrine and cloflium after bilateral vagotomy. ECGs, haemodynamics and epicardial monophasic action potentials were recorded. KEY RESULTS TdP occurred in 57% of rabbits given phenylephrine and clofilium. Replacement of phenylephrine with saline or angiotensin II reduced the incidence of TdP to 0 and 17%, respectively. Vagotomy prevented TdP in rabbits given phenylephrine and clofilium. Increases in blood pressure induced by phenylephrine and angiotensin II were similar. Bradycardia only occurred with phenylephrine and was reduced but not abolished by vagotomy. Neither short-term variability of repolarization nor action potential triangulation could predict TdP. CONCLUSIONS AND IMPLICATIONS These results indicate that reflex activation of vagal nerve activity is essential for the induction of drug-induced TdP in alpha1-adrenoceptor-stimulated anaesthetized rabbits. This implies that alterations in vagal activity may also precipitate episodes of drug-induced TdP in man and that this should be considered in selecting models used in drug development.
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Affiliation(s)
- A Farkas
- Department of Pharmacology and Therapeutics, The University of Liverpool, Liverpool, UK
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Robertson S, Murray M, Young D, Pilley R, Dempster J. A randomized crossover trial of conservative snoring treatments: Mandibular repositioning splint and nasal CPAP. Otolaryngol Head Neck Surg 2008; 138:283-288. [DOI: 10.1016/j.otohns.2007.11.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2007] [Revised: 10/30/2007] [Accepted: 11/05/2007] [Indexed: 11/16/2022]
Abstract
OBJECTIVE: To compare the effectiveness of a mandibular repositioning splint (MRS) and nasal continuous positive airway pressure (CPAP) device as first-line treatments for disruptive snoring. STUDY DESIGN: Prospective randomized crossover trial. SUBJECTS AND METHODS: Twenty snorers received 3 months of treatment with both an MRS and nasal CPAP. Snoring Outcomes Survey (SOS), Snoring Bed Partner Survey, and Epworth questionnaires were completed serially. Changes in questionnaire scores were analyzed with a general linear statistical model and by analysis of variance. RESULTS: There was a significant difference between the three preference outcomes for the mean SOS changes ( P = 0.003). The mean SOS change was significantly greater for those who preferred MRS to CPAP (mean score difference, 27.15). Eight snorers chose final long-term MRS treatment, five chose nasal CPAP, and seven chose neither. CONCLUSION: The majority of disruptive snorers can be managed effectively with conservative treatments and therefore avoid surgery.
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Affiliation(s)
| | - Maria Murray
- Kilmarnock and Glasgow, Scotland, United Kingdom
| | - David Young
- Kilmarnock and Glasgow, Scotland, United Kingdom
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Michael G, Dempster J, Kane KA, Coker SJ. Potentiation of E-4031-induced torsade de pointes by HMR1556 or ATX-II is not predicted by action potential short-term variability or triangulation. Br J Pharmacol 2007; 152:1215-27. [PMID: 17965747 DOI: 10.1038/sj.bjp.0707513] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Torsade de pointes (TdP) can be induced by a reduction in cardiac repolarizing capacity. The aim of this study was to assess whether IKs blockade or enhancement of INa could potentiate TdP induced by IKr blockade and to investigate whether short-term variability (STV) or triangulation of action potentials preceded TdP. EXPERIMENTAL APPROACH Experiments were performed in open-chest, pentobarbital-anaesthetized, alpha 1-adrenoceptor-stimulated, male New Zealand White rabbits, which received three consecutive i.v. infusions of either the IKr blocker E-4031 (1, 3 and 10 nmol kg(-1) min(-1)), the IKs blocker HMR1556 (25, 75 and 250 nmol kg(-1) min(-1)) or E-4031 and HMR1556 combined. In a second study rabbits received either the same doses of E-4031, the INa enhancer, ATX-II (0.4, 1.2 and 4.0 nmol kg(-1)) or both of these drugs. ECGs and epicardial monophasic action potentials were recorded. KEY RESULTS HMR1556 alone did not cause TdP but increased E-4031-induced TdP from 25 to 80%. ATX-II alone caused TdP in 38% of rabbits, as did E-4031; 75% of rabbits receiving both drugs had TdP. QT intervals were prolonged by all drugs but the extent of QT prolongation was not related to the occurrence of TdP. No changes in STV were detected and triangulation was only increased after TdP occurred. CONCLUSIONS AND IMPLICATIONS Giving modulators of ion channels in combination substantially increased TdP but, in this model, neither STV nor triangulation of action potentials could predict TdP.
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Affiliation(s)
- G Michael
- Strathclyde Institute of Pharmacy and Biomedical Sciences, Division of Physiology and Pharmacology, University of Strathclyde, Glasgow, UK
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Mitchell EA, Gentet LJ, Dempster J, Belelli D. GABAA and glycine receptor-mediated transmission in rat lamina II neurones: relevance to the analgesic actions of neuroactive steroids. J Physiol 2007; 583:1021-40. [PMID: 17656439 PMCID: PMC2277187 DOI: 10.1113/jphysiol.2007.134445] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Analgesic neurosteroids such as 5alpha-pregnan-3alpha-ol-20-one (5alpha3alpha) are potent selective endogenous modulators of the GABA(A) receptor (GABA(A)R) while certain synthetic derivatives (i.e. minaxolone) additionally enhance the function of recombinant glycine receptors (GlyR). Inhibitory transmission within the superficial dorsal horn has been implicated in mediating the analgesic actions of neurosteroids. However, the relative contribution played by synaptic and extrasynaptic receptors is unknown. In this study, we have compared the actions of 5alpha3alpha and minaxolone upon inhibitory transmission mediated by both GABA(A) and strychnine-sensitive GlyRs in lamina II neurones of juvenile (P15-21) rats. At the near physiological temperature of 35 degrees C and at a holding potential of -60 mV we recorded three kinetically distinct populations of miniature IPSCs (mIPSCs): GlyR-mediated, GABA(A)R-mediated and mixed GABA(A)R-GlyR mIPSCs, arising from the corelease of both inhibitory neurotransmitters. In addition, sequential application of strychnine and bicuculline revealed a small (5.2 +/- 1.0 pA) GlyR- but not a GABA(A)R-mediated tonic conductance. 5alpha3alpha (1-10 microm) prolonged GABA(A)R and mixed mIPSCs in a concentration-dependent manner but was without effect upon GlyR mIPSCs. In contrast, minaxolone (1-10 microm) prolonged the decay of GlyR mIPSCs and, additionally, was approximately 10-fold more potent than 5alpha3alpha upon GABA(A)R mIPSCs. However, 5alpha3alpha and minaxolone (1 microm) evoked a similar bicuculline-sensitive inhibitory conductance, indicating that the extrasynaptic GABA(A)Rs do not discriminate between these two steroids. Furthermore, approximately 92% of the effect of 1 microm 5alpha3alpha upon GABAergic inhibition could be accounted for by its action upon the extrasynaptic conductance. These findings are relevant to modulation of inhibitory circuits within spinally mediated pain pathways and suggest that extrasynaptic GABA(A)Rs may represent a relevant molecular target for the analgesic actions of neurosteroids.
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Affiliation(s)
- Elizabeth A Mitchell
- Neurosciences Institute, Division of Pathology and Neuroscience, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, UK
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Basavaraj S, Reddy E, Dempster J, Reddy K. Buscopan in food bolus obstruction of oesophagus: a randomised controlled single blinded study. Clin Otolaryngol 2007. [DOI: 10.1111/j.1365-2273.2007.01419_5.x] [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: 11/30/2022]
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Abstract
The time course and magnitude of the Ca(2+) fluxes underlying spontaneous Ca(2+) waves in single permeabilized ventricular cardiomyocytes were derived from confocal Fluo-5F fluorescence signals. Peak flux rates via the sarcoplasmic reticulum (SR) release channel (RyR2) and the SR Ca(2+) ATPase (SERCA) were not constant across a range of cellular [Ca(2+)] values. The Ca(2+) affinity (K(mf)) and maximum turnover rate (V(max)) of SERCA and the peak permeability of the RyR2-mediated Ca(2+) release pathway increased at higher cellular [Ca(2+)] loads. This information was used to create a computational model of the Ca(2+) wave, which predicted the time course and frequency dependence of Ca(2+) waves over a range of cellular Ca(2+) loads. Incubation of cardiomyocytes with the Ca(2+) calmodulin (CaM) kinase inhibitor autocamtide-2-related inhibitory peptide (300 nM, 30 mins) significantly reduced the frequency of the Ca(2+) waves at high Ca(2+) loads. Analysis of the Ca(2+) fluxes suggests that inhibition of CaM kinase prevented the increases in SERCA V(max) and peak RyR2 release flux observed at high cellular [Ca(2+)]. These data support the view that modification of activity of SERCA and RyR2 via a CaM kinase sensitive process occurs at higher cellular Ca(2+) loads to increase the maximum frequency of spontaneous Ca(2+) waves.
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Affiliation(s)
- N MacQuaide
- Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, United Kingdom
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Abstract
The British Association of Head and Neck Oncologists (BAHNO) is ’a multidisciplinary society for healthcare professionals involved in the study and treatment of head and neck cancer’. Surgical members of this organization are from three specialities (otolaryngology, maxillo-facial and plastic surgery). Although the overall impression is that the management of UK head and neck cancer patients is consensus based, there are appreciable differences in each surgical speciality’s practice. Anecdotally, this can lead to variation in the management of very similar patients. To identify some of these variations BAHNO surgeons were surveyed regarding their current head and neck cancer practices from the perspectives of surgical activity and post-operative care. Some unexpected differences were identified, particularly in relation to post-operative care with plastic and maxillo-facial surgeons demonstrating different patterns of high dependency unit (HDU) and intensive care unit (ICU) use for the same patients. The implications for future consensus in the light of these variations are discussed.
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Affiliation(s)
- A Murray
- Department of Otolaryngology, Head and Neck Surgery, Crosshouse Hospital, Kilmarnock, UK.
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Zinselmeyer BH, Dempster J, Gurney AM, Wokosin D, Miller M, Ho H, Millington OR, Smith KM, Rush CM, Parker I, Cahalan M, Brewer JM, Garside P. In situ characterization of CD4+ T cell behavior in mucosal and systemic lymphoid tissues during the induction of oral priming and tolerance. ACTA ACUST UNITED AC 2005; 201:1815-23. [PMID: 15928201 PMCID: PMC2213276 DOI: 10.1084/jem.20050203] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.8] [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] [Indexed: 01/25/2023]
Abstract
The behavior of antigen-specific CD4+ T lymphocytes during initial exposure to antigen probably influences their decision to become primed or tolerized, but this has not been examined directly in vivo. We have therefore tracked such cells in real time, in situ during the induction of oral priming versus oral tolerance. There were marked contrasts with respect to rate and type of movement and clustering between naive T cells and those exposed to antigen in immunogenic or tolerogenic forms. However, the major difference when comparing tolerized and primed T cells was that the latter formed larger and longer-lived clusters within mucosal and peripheral lymph nodes. This is the first comparison of the behavior of antigen-specific CD4+ T cells in situ in mucosal and systemic lymphoid tissues during the induction of priming versus tolerance in a physiologically relevant model in vivo.
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Affiliation(s)
- Bernd H Zinselmeyer
- Division of Immunology, Infection, and Inflammation, University of Glasgow, Western Infirmary, Glasgow G11 6NT, Scotland, UK
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Sivaji N, Basavaraj S, Stewart W, Dempster J. Adenoid cystic carcinoma of the nasal septum. Rhinology 2003; 41:253-4. [PMID: 14750355] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Adenoid cystic carcinoma is a malignant tumour frequently described arising from seromucinous salivary tissue in the major and minor salivary glands. Within the nasal cavity, it is uncommon and usually involves the lateral wall. A rare case of adenoid cystic carcinoma of the nasal septum is presented along with a review of the literature. The presentation and management of this uncommon condition is discussed.
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Affiliation(s)
- N Sivaji
- Department of Otolaryngology-Head and Neck Surgery, Crosshouse Hospital, Kilmarnock, United Kingdom.
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Abstract
Riedels thyroiditis is a rare chronic inflammatory disorder characterised by extensive fibrosis of the thyroid gland and sometimes the surrounding tissues. We report a case of Riedels Thyroiditis in a middle aged female presenting with goitre, stridor and dyspnoea. She initially responded to corticosteroid treatment and subsequently to tamoxifen. The rationale for these treatments are discussed.
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Affiliation(s)
- M De
- Department of Ear, Nose and Throat, Crosshouse Hospital, Kilmarnock
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Hoskins G, Smith B, Neville RG, Loveridge T, Barnes GR, Dempster J. The Benefits of Specialist Asthma Education for Nurse Practitioners in the USA. Prim Care Respir J 2001. [DOI: 10.1038/pcrj.2001.33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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