1
|
Struthers S, Fiss T, Classen HL, Gomis S, Dickinson R, Crowe TG, Herwig E, Schwean-Lardner K. The effect of infrared beak treatment on the welfare of turkeys reared to 12 weeks of age. Poult Sci 2022; 101:101728. [PMID: 35192937 PMCID: PMC8866716 DOI: 10.1016/j.psj.2022.101728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 01/05/2022] [Accepted: 01/09/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- S Struthers
- Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh EH25 9RG, Scotland; Monogastric Science Research Centre, Scotland's Rural College, Roslin Institute, EH25 9RG Scotland
| | - T Fiss
- Department and Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada S7N 5A8
| | - H L Classen
- Department and Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada S7N 5A8
| | - S Gomis
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada S7N 5B4
| | - R Dickinson
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada S7N 5B4
| | - T G Crowe
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada S7N 5A9
| | - E Herwig
- Department and Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada S7N 5A8
| | - K Schwean-Lardner
- Department and Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada S7N 5A8.
| |
Collapse
|
2
|
Dickinson R, Kennedy MC, Raynor DK, Knapp P, Thomas M, Adami E. What has been the impact of the Traditional Herbal Registration (THR) scheme in the UK on information provided with herbal products bought over the counter? Altern Ther Health Med 2019; 19:85. [PMID: 30975140 PMCID: PMC6460666 DOI: 10.1186/s12906-019-2494-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 03/28/2019] [Indexed: 01/22/2023]
Abstract
BACKGROUND In 2011 there was a strengthening of European Union (EU) legislation on the licencing of herbal products which, in the UK, resulted in the introduction of the Traditional Herbal Registration (THR) scheme. This scheme sets out standards for the safety and quality of herbal medicines and includes the provision of information to the customer on the safe use of the product. The aim of this study is to replicate a survey undertaken in 2011, prior to the implementation of the THR scheme, and evaluate the impact of this scheme on the information provided with herbal products bought over-the-counter. METHODS We undertook a survey on 5 herbal products commonly available over-the-counter (St John's wort, echinacea, Ginkgo biloba, Asian ginseng, garlic). The information was searched for key safety messages identified by the National Center for Complementary and Integrative Health (NCCIH). We also explored the presence of risk of harm information. RESULTS We recorded a rise in the number of products registered with the THR scheme (37% in 2016 compared to 7% in 2011). We also identified a reduction in the number of products that did not contain key safety information (75% in 2011 compared to 20% of products obtained in 2016). Risk of harm information was only communicated in products containing a PIL. We identified more products containing frequency of risk of harm information but this was not statistically significant. CONCLUSION The introduction of the THR scheme appears to be associated with an increase in the provision of information about key safety messages on the safe use of herbal products. However, it is important to note that at least half of the products on the market that are not included in the THR scheme do not contain any information about their safe use; this includes information about precautions, interactions and side effects. The use of NCCIH herbal monographs replicated the methods used in the previous study; we recognise that the use of a different resource might effect the appraisal of the information provided. We also acknowledge that surveying presence of information does not assure that the latter is effectively communicated to patients, for which a close textual analysis would be required. While it is promising that more information is available after the introduction of the THR scheme, the public needs to be informed about ways to optimise safe use of all herbal products.
Collapse
|
3
|
Johansen A, Liddicoat M, Hannaford J, Wakeman R, Boulton C, Dickinson R. 66INTRODUCING A NATIONAL PROGRAMME OF SCREENING WITH THE 4A TEST TO IDENTIFY DELIRIUM - THE COMMONEST COMPLICATION OF HIP FRACTURE SURGERY. Age Ageing 2019. [DOI: 10.1093/ageing/afy214.03] [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: 11/12/2022] Open
Affiliation(s)
- A Johansen
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| | - M Liddicoat
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| | - J Hannaford
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| | - R Wakeman
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| | - C Boulton
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| | - R Dickinson
- National Hip Fracture Database (NHFD), Falls and Fragility Fracture Audit Programme (FFFAP), Royal College of Physicians, London
| |
Collapse
|
4
|
Dadarwal D, González-Cano P, Dickinson R, Griebel P, Palmer C. Characterization of cytokine gene expression in uterine cytobrush samples of non-endometritic versus endometritic postpartum dairy cows. Theriogenology 2018; 126:128-139. [PMID: 30551019 DOI: 10.1016/j.theriogenology.2018.12.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 08/17/2018] [Revised: 12/03/2018] [Accepted: 12/04/2018] [Indexed: 12/31/2022]
Abstract
To better understand uterine inflammation in postpartum dairy cows we collected sequential cytobrush samples at 29-35 and at 49-55 d in milk (DIM). Based on the uterine cytology, cows were classified as Non-endometritic (n = 23; <18% neutrophils) or Endometritic (n = 12; ≥18% neutrophils) at 29-35 DIM and Non-endometritic (n = 17; <10% neutrophils) or Endometritic (n = 9; ≥10% neutrophils) at 49-55 DIM. Cows defined as Sham Controls (n = 6) were examined by vaginoscopy at 29-35 DIM and identified as Non-endometritic (<10% neutrophils) at 49-55 DIM. Cytokine gene expression in cytobrush samples was assessed using qRT-PCR. Sham Controls did not differ significantly (P > 0.17) from Non-endometritic cows at 49-55 DIM and these data were combined (n = 23). Uterine cytology-based classification using the aforementioned thresholds effectively separated cows into groups with Endometritic cows having significantly higher expression of pro-inflammatory (interleukin (IL)-1α, IL-1β, IL-6, IL-8, IL-17A CSF-1; P < 0.01) and regulatory (IL-1RA and IL-10; P < 0.03) cytokines, relative to Non-endometritic cows. Furthermore, Non-endometritic cows showed a significant decline (P < 0.03) in the expression of pro-inflammatory (IL-1α, IL-6, IL-8) and regulatory (IL-10) cytokine genes as the postpartum period progressed; whereas Endometritic cows exhibited a sustained elevation in transcript abundance throughout the sample period for both pro-inflammatory and regulatory cytokine genes. Expression of transforming growth factor (TGF) genes was more complex with TGF-β3 expression significantly (P < 0.01) lower at 29-35 DIM and TGF-β1 gene expression significantly (P < 0.03) increased at 49-55 DIM in Endometritic versus Non-endometritic cows. Expression of TGF-β2 gene was 2.7-fold higher (P < 0.01) at 29-35 DIM in cows that remained Endometritic when compared to cows recovering by 49-55 DIM. Some Non-endometritic cows (n = 4) at 29-35 DIM were reclassified as Endometritic at 49-55 DIM. The sampling procedures at 29-35 DIM did not alter either the cellular response (P > 0.43) or cytokine gene expression (P > 0.17) at 49-55 DIM. In conclusion, normal uterine involution is characterized by a progressive decline in pro-inflammatory and regulatory cytokine gene expression, while cows with endometritis show a dysregulated inflammatory process characterized by a sustained elevation in pro-inflammatory and regulatory cytokine gene expression. This analysis also shows that decreased TGF-β2 gene expression at 29-35 DIM may be an indicator of recovery from endometritis.
Collapse
Affiliation(s)
- D Dadarwal
- Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, S7N 5B4, Canada.
| | - P González-Cano
- Instituto de Farmacobiología, Universidad de la Cañada, Oaxaca, CP.68540, Mexico
| | - R Dickinson
- Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, S7N 5B4, Canada
| | - P Griebel
- Vaccine and Infectious Disease Organization-InterVac, University of Saskatchewan, 120 Veterinary Rd, Saskatoon, SK, S7N 5E3, Canada; School of Public Health, University of Saskatchewan, 104 Clinic Place, Saskatoon, SK, S7N 2Z4, Canada
| | - C Palmer
- Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, S7N 5B4, Canada
| |
Collapse
|
5
|
Campos-Pires R, Armstrong S, Sebastiani A, Luh C, Gruss M, Radyushkin K, Hirnet T, Werner C, Engelhard K, Franks N, Thal S, Dickinson R. Xenon treatment improves short-term and long-term outcomes in a rodent model of traumatic brain injury. Br J Anaesth 2018. [DOI: 10.1016/j.bja.2018.05.022] [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: 12/01/2022] Open
|
6
|
Abstract
During a one-year period, 206 of 245 patients referred directly to a single-visit dyspepsia clinic underwent gastroscopy after clinical consultation. Endoscopic findings enabled diagnosis in the majority and no complications occurred. In 12 patients with positive endoscopies there was an unrelated clinical diagnosis, and 23 with normal endoscopies had organic disease. Such a clinic has advantages both for patients in providing single-visit diagnosis and management for the majority, and for the hospital in reducing the load on outpatient services. Prior consultation may prevent both unwarranted use of endoscopy facilities and inappropriate diagnosis.
Collapse
Affiliation(s)
- A Lobo
- Department of Medicine, Hinchingbrooke Hospital, Huntingdon, Cambridgeshire
| | | |
Collapse
|
7
|
Rodgers H, Scott O, Beckett P, Navani N, Dickinson R. Development of the first patient-level National Lung Cancer Audit 2016 key findings for patient and carers. Lung Cancer 2018. [DOI: 10.1016/s0169-5002(18)30148-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: 11/25/2022]
|
8
|
Harden S, Khakwani A, Dickinson R, Navani N, Hubbard R, Beckett P. Curative intent treatment for small cell lung cancer (SCLC) in England. Lung Cancer 2018. [DOI: 10.1016/s0169-5002(18)30199-5] [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: 10/18/2022]
|
9
|
Khakwani A, Harden S, Baldwin D, Foweraker K, Navani N, Dickinson R, West D, Beckett P, Hubbard R. P1.05-010 Curative Treatment Rates for Patients Diagnosed with Early Stage Non-Small Cell Lung Cancer (NSCLC) in England. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.882] [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: 10/18/2022]
|
10
|
Thompson A, Dickinson R, Murphy F, Thomson JP, Marriott H, Tavares A, Willson J, Williams L, Lewis A, Mirchandani A, Dos Santos Coelho P, Doherty C, Ryan E, Watts E, Morton NM, Forbes S, Stimson RH, Hameed AG, Arnold N, Preston J, Lawrie A, Finisguerra V, Mazzone M, Sadiku P, Goveia J, Taverna F, Carmeliet P, Foster S, Chilvers E, Cowburn A, Dockrell D, Johnson R, Meehan RR, Whyte M, Walmsley S. Hypoxia determines survival outcomes of bacterial infection through HIF-1alpha dependent re-programming of leukocyte metabolism. Sci Immunol 2017; 2:eaal2861. [PMID: 28386604 PMCID: PMC5380213 DOI: 10.1126/sciimmunol.aal2861] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Hypoxia and bacterial infection frequently co-exist, in both acute and chronic clinical settings, and typically result in adverse clinical outcomes. To ameliorate this morbidity, we investigated the interaction between hypoxia and the host response. In the context of acute hypoxia, both S. aureus and S. pneumoniae infections rapidly induced progressive neutrophil mediated morbidity and mortality, with associated hypothermia and cardiovascular compromise. Preconditioning animals through longer exposures to hypoxia, prior to infection, prevented these pathophysiological responses and profoundly dampened the transcriptome of circulating leukocytes. Specifically, perturbation of HIF pathway and glycolysis genes by hypoxic preconditioning was associated with reduced leukocyte glucose utilisation, resulting in systemic rescue from a global negative energy state and myocardial protection. Thus we demonstrate that hypoxia preconditions the innate immune response and determines survival outcomes following bacterial infection through suppression of HIF-1α and neutrophil metabolism. The therapeutic implications of this work are that in the context of systemic or tissue hypoxia therapies that target the host response could improve infection associated morbidity and mortality.
Collapse
Affiliation(s)
- A.A.R. Thompson
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - R.S. Dickinson
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - F. Murphy
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - J. P. Thomson
- MRC Human Genetics Unit at the Institute of Genetics and Molecular Medicine at the University of Edinburgh, Edinburgh, UK
| | - H.M. Marriott
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A. Tavares
- University of Edinburgh/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - J. Willson
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - L. Williams
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A. Lewis
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A. Mirchandani
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - P. Dos Santos Coelho
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - C. Doherty
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - E. Ryan
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - E. Watts
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - N. M. Morton
- University of Edinburgh/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - S. Forbes
- University of Edinburgh/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - R. H. Stimson
- University of Edinburgh/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - A. G. Hameed
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - N. Arnold
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - J.A. Preston
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - A. Lawrie
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - V. Finisguerra
- Laboratory of Molecular Oncology and Angiogenesis, Vesalius Research Center, VIB, Leuven, B3000, Belgium
- Laboratory of Molecular Oncology and Angiogenesis, Vesalius Research Center, Department of Oncology, KU Leuven, Leuven, B3000, Belgium
| | - M. Mazzone
- Laboratory of Molecular Oncology and Angiogenesis, Vesalius Research Center, VIB, Leuven, B3000, Belgium
- Laboratory of Molecular Oncology and Angiogenesis, Vesalius Research Center, Department of Oncology, KU Leuven, Leuven, B3000, Belgium
| | - P. Sadiku
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - J. Goveia
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, VIB, Leuven, B3000, Belgium
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, K.U. Leuven, B3000, Belgium
| | - F. Taverna
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, VIB, Leuven, B3000, Belgium
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, K.U. Leuven, B3000, Belgium
| | - P. Carmeliet
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, VIB, Leuven, B3000, Belgium
- Laboratory of Angiogenesis and Vascular Metabolism, Vesalius Research Centre, K.U. Leuven, B3000, Belgium
| | - S.J. Foster
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, UK
| | - E.R. Chilvers
- Department of Medicine, University of Cambridge, Cambridge, UK
| | - A.S. Cowburn
- Department of Medicine, University of Cambridge, Cambridge, UK
- Department of Physiology, Development and Neuroscience, University of Cambridge, UK
| | - D.H. Dockrell
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - R.S. Johnson
- Department of Physiology, Development and Neuroscience, University of Cambridge, UK
| | - R. R. Meehan
- MRC Human Genetics Unit at the Institute of Genetics and Molecular Medicine at the University of Edinburgh, Edinburgh, UK
| | - M.K.B. Whyte
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - S.R. Walmsley
- MRC/University of Edinburgh Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| |
Collapse
|
11
|
West D, Beckett P, Khakwani A, Hubbard R, Dickinson R, Woolhouse I. S60 Lung cancer surgical survival and volume in england. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
12
|
Beckett P, Khakwani A, Hubbard R, Vernon S, Jack R, Wood N, Plewa B, McAndrew N, Dickinson R, Navani N, Harden S, Woolhouse I. P104 Results of the first analysis of national lung cancer audit data based on cancer registration data. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
13
|
Khakwani A, Hubbard R, Jack R, Wood N, Vernon S, Beckett P, Navani N, Harden S, Dickinson R, Woolhouse I. P103 Apples and pears? a comparison of two sources of lung cancer data in england. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
14
|
Williams SP, Dickinson R, Walmsley SR. S44 Pseudomonas aeruginosa induces neutrophil cell death which is reversed by hypoxia. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.50] [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: 11/03/2022]
|
15
|
Stewart B, Kanal K, Dickinson R, Zamora D. MO-F-16A-06: Implementation of a Radiation Exposure Monitoring System for Surveillance of Multi-Modality Radiation Dose Data. Med Phys 2014. [DOI: 10.1118/1.4889177] [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: 11/07/2022] Open
|
16
|
Kanal K, Hoff M, Dickinson R, Zamora D, Stewart B. SU-E-E-01: ABR Diagnostic Radiology Core Exam: Was Our Redesigned Physics Course Successful in Teaching Physics to Radiology Residents? Med Phys 2014. [DOI: 10.1118/1.4887932] [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: 11/07/2022] Open
|
17
|
Zamora D, Dickinson R, Kanal K, Stewart B. MO-F-213CD-07: Implementation of Dose Monitoring in a Cardiology Department with Independent Medical Reporting Systems. Med Phys 2012. [DOI: 10.1118/1.4735832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
18
|
Zamora D, Kanal K, Dickinson R, Shuman W, Stewart B. TU-G-217BCD-09: Integration of Recent NEMA (MITA) XR-25 CT Dose-Check Standard into Clinical Practice. Med Phys 2012. [DOI: 10.1118/1.4736023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
19
|
Dickinson R, Kanal K, Zamora D, Stewart B. SU-E-I-34: Air Kerma to Estimated Entrance Skin Dose Look-Up Tables: A Tool to Improve Dose Awareness in the Angiography Suite. Med Phys 2012; 39:3632. [PMID: 28519524 DOI: 10.1118/1.4734749] [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] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Although air kerma (AK) is displayed during a case, often it does not represent the entrance skin dose (ESD), which can be estimated. The purpose of this work is to develop and provide system-customized AK-to- ESD look-up tables (LUTs) for immediate reference so that physicians can better evaluate the likelihood of deterministic skin reactions to weigh the risk-versus-benefit of continuing high-dose procedures. METHODS Four correction factors are applied to estimate ESD from AK: inverse square correction from the interventional reference point to the average entrance table position, backscatter factor, mean energy absorption coefficient ratio, and measured table attenuation. Correction factors are room and service specific; therefore, room-specific AK-to-ESD LUTs are posted for easy reference. LUTs also list corresponding tissue reactions and their approximate time-of-onset. Protocols can be established for nurse or technology staff to provide verbal AK dose notifications during the case at crucial skin reaction dose thresholds (e.g. 2Gy indicating possible skin erythema and 5Gy indicating potentially prolonged recovery or permanent skin damage). Patient follow-up protocols can be established if the estimated ESD exceeds a set trigger level (e.g. 5Gy). Staff and physicians surveys evaluate usefulness and impact of dose awareness by system users. RESULTS Two surveys report feedback on LUTs from physicians and technologists with 14 years median experience (range: 3-24 years). Over three-quarters of all angiography system users identify the LUTs and verbal dose notifications as positively affecting the institution's 'Patient First' initiative and roughly one-half of the imaging system users indicate that the LUTs and site-specific dose trigger level improves the dose awareness of care providers. CONCLUSIONS Our efforts have focused on educating care providers about the differences between displayed AK and the estimated ESD. LUTs provide physicians and staff an immediate reference for estimated ESD and the associated deterministic skin effects at specific dose levels.
Collapse
Affiliation(s)
| | - K Kanal
- University of Washington, Seattle, WA
| | - D Zamora
- University of Washington, Seattle, WA
| | - B Stewart
- University of Washington, Seattle, WA
| |
Collapse
|
20
|
Stewart B, Zamora D, Dickinson R, Rohrmann C, Kanal K. MO-F-213CD-06: Implementation of Fluoroscopy Dose Mining and Analysis Process for Continuous Quality Assurance. Med Phys 2012. [DOI: 10.1118/1.4735831] [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: 11/07/2022] Open
|
21
|
Kanal K, Dickinson R, Zamora D, Cohen W, Valji K, Stewart B. MO-F-213CD-05: Establishing a Follow-Up Process for Angiographic Patients Receiving an Estimated Entrance Skin Dose in Excess of 5 Gy. Med Phys 2012. [DOI: 10.1118/1.4735830] [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: 11/07/2022] Open
|
22
|
Dickinson R, Kanal K, Zamora D, Stewart B. MO-F-110-01: Analysis of Distribution of Procedure Time and Dose in Interventional Radiography (IR): Setting Thresholds for Case Review. Med Phys 2011. [DOI: 10.1118/1.3613023] [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: 11/07/2022] Open
|
23
|
Kanal K, Dickinson R, Zamora D, Stewart B. SU-E-E-06: The New ABR Exam: What Have We Done to Change the Way We Teach Physics to Residents? Med Phys 2011. [DOI: 10.1118/1.3611560] [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: 11/07/2022] Open
|
24
|
Kanal K, Gunn M, Dickinson R, Stewart B. TH-C-201B-03: Computed Tomography Dose Data Mining and Surveillance as an Ongoing Quality Assurance Improvement Process. Med Phys 2010. [DOI: 10.1118/1.3469520] [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: 11/07/2022] Open
|
25
|
Barber ND, Alldred DP, Raynor DK, Dickinson R, Garfield S, Jesson B, Lim R, Savage I, Standage C, Buckle P, Carpenter J, Franklin B, Woloshynowych M, Zermansky AG. Care homes' use of medicines study: prevalence, causes and potential harm of medication errors in care homes for older people. Qual Saf Health Care 2009; 18:341-6. [PMID: 19812095 PMCID: PMC2762085 DOI: 10.1136/qshc.2009.034231] [Citation(s) in RCA: 187] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/27/2009] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Care home residents are at particular risk from medication errors, and our objective was to determine the prevalence and potential harm of prescribing, monitoring, dispensing and administration errors in UK care homes, and to identify their causes. METHODS A prospective study of a random sample of residents within a purposive sample of homes in three areas. Errors were identified by patient interview, note review, observation of practice and examination of dispensed items. Causes were understood by observation and from theoretically framed interviews with home staff, doctors and pharmacists. Potential harm from errors was assessed by expert judgement. RESULTS The 256 residents recruited in 55 homes were taking a mean of 8.0 medicines. One hundred and seventy-eight (69.5%) of residents had one or more errors. The mean number per resident was 1.9 errors. The mean potential harm from prescribing, monitoring, administration and dispensing errors was 2.6, 3.7, 2.1 and 2.0 (0 = no harm, 10 = death), respectively. Contributing factors from the 89 interviews included doctors who were not accessible, did not know the residents and lacked information in homes when prescribing; home staff's high workload, lack of medicines training and drug round interruptions; lack of team work among home, practice and pharmacy; inefficient ordering systems; inaccurate medicine records and prevalence of verbal communication; and difficult to fill (and check) medication administration systems. CONCLUSIONS That two thirds of residents were exposed to one or more medication errors is of concern. The will to improve exists, but there is a lack of overall responsibility. Action is required from all concerned.
Collapse
Affiliation(s)
- N D Barber
- Department of Practice and Policy, School of Pharmacy, Tavistock House, Tavistock Square, London WC1H 9JP, UK.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Sykes J, Lindsay R, Fairfoul J, Emmens D, Dickinson R, Thwaites D. DEVELOPMENT OF A CLINICALLY REALISTIC TEST FOR EVALUATION OF X-RAY TOMOGRAPHIC IGRT SYSTEMS. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72930-4] [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: 11/26/2022]
|
27
|
Lindsay R, Sykes J, Stanley S, Dickinson R, Thwaites D. A TECHNICAL EVALUATION AND IMPLEMENTATION SURVEY OF THREE IGRT SYSTEMS AT ELEVEN UK CENTRES. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72931-6] [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: 10/27/2022]
|
28
|
Rhodes JM, Robinson R, Beales I, Pugh S, Dickinson R, Dronfield M, Speirs CJ, Wilkinson P, Wilkinson SP. Clinical trial: oral prednisolone metasulfobenzoate (Predocol) vs. oral prednisolone for active ulcerative colitis. Aliment Pharmacol Ther 2008; 27:228-40. [PMID: 17988236 DOI: 10.1111/j.1365-2036.2007.03569.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Systemic corticosteroids are effective in ulcerative colitis but commonly cause side effects. AIM To compare the safety and efficacy of a sparingly absorbed formulation of prednisolone metasulfobenzoate (Predocol) with a conventional tapering course of oral prednisolone. METHOD In a double-blind randomized study, 59 active ulcerative colitis patients received Predocol 40 mg/day for 6 months, 61 received Predocol 60 mg/day for 6 months and 61 received prednisolone 40 mg/day for 2 weeks, tapered to week 8, followed by placebo until 6 months. RESULTS Steroid-related side effects assessed using a 10-cm visual analogue scale were fewer at 2 months with Predocol 40 mg [VAS 8.1 cm (2.6), mean (s.d.)], or 60 mg [8.1 (2.1)] compared with prednisolone [6.7 (2.7); P = 0.01]. Mood changes affected 43% receiving prednisolone at 4 weeks vs. 8% for Predocol 40 mg (P = 0.001). Remission rates (Powell-Tuck < or =2) at 2 months were Predocol 40 mg 46%, Predocol 60 mg 28% and tapering prednisolone 41% (P = 0.13). Visual analogue scale for efficacy also showed non-inferiority for Predocol 40 mg/day. Remission rates at 6 months were Predocol 40 mg 51%, Predocol 60 mg 38% and tapering prednisolone 32% (P = 0.08). CONCLUSION Predocol 40 mg/day has similar efficacy but markedly fewer side effects than a conventional tapering prednisolone regimen (ISRCTN14133410).
Collapse
Affiliation(s)
- J M Rhodes
- School of Clinical Science, University of Liverpool, Liverpool, UK.
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Dickinson R, Erwin W, Bidaut L, Vija A, Williams C, Wendt R. SU-FF-I-107: Improving the Accuracy of CT Topograms for Node Localization in Breast Lymphoscintigraphy. Med Phys 2007. [DOI: 10.1118/1.2760484] [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: 11/07/2022] Open
|
30
|
Dickinson R, Stevens D, Williams C, Wendt R. SU-FF-I-105: Dosimetric Comparison of Planar and 3-Dimensional Methods of Anatomic Localization for Breast Lymphoscintigraphy. Med Phys 2007. [DOI: 10.1118/1.2760482] [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: 11/07/2022] Open
|
31
|
Cyarto E, Dickinson R, Marshall A, Brown W. 158 Is the CHAMPS physical activity questionnaire for older adults reliable in an older Australian sample? J Sci Med Sport 2005. [DOI: 10.1016/s1440-2440(17)30653-9] [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: 10/19/2022]
|
32
|
Abstract
BACKGROUND Isoflurane and xenon are inhalation general anaesthetics with differing clinical profiles and contrasting synaptic actions. Both agents have been shown to depress excitatory synaptic responses. Whether this is via pre-synaptic or post-synaptic mechanisms has not been determined clearly. N-type calcium channels are a putative pre-synaptic target for these agents. We tested whether N-type calcium channels were sensitive to isoflurane and xenon and whether there was any stereoselectivity in the effect of isoflurane. METHODS We used patch-clamp electrophysiology on isolated HEK293 cells stably expressing N-type calcium channels to investigate the effects of isoflurane and xenon on barium currents mediated by N-type calcium channels. RESULTS Racemic isoflurane caused a concentration-dependent reduction (11-35%) in the peak current through the N-type channels in the concentration range 0.15-1.22 mM. In the clinically relevant concentration range the inhibition was small. At an isoflurane concentration of 0.31 mM (equivalent to 1 MAC), the peak N-type current was inhibited by 14 (1)%. The optical isomers of isoflurane were found to be equally potent at inhibiting currents through N-type channels. The inert gas anaesthetic xenon was found to have no measureable effect on N-type channels at a concentration of 3.4 mM (approximately 1 MAC). CONCLUSIONS These results suggest that N-type calcium channels are not the targets mediating general anaesthesia with these two inhalation agents.
Collapse
Affiliation(s)
- I L White
- Department of Anaesthetics and Intensive Care, Faculty of Medicine, Imperial College London, Chelsea and Westminster Campus, 369 Fulham Road, London SW10 9NH, UK
| | | | | |
Collapse
|
33
|
McNamara I, Tremelling M, Dunkley I, Roberts P, Dickinson R. Management of intestinal obstruction in malignant disease. Clin Med (Lond) 2003; 3:481. [PMID: 14601952 PMCID: PMC4953650 DOI: 10.7861/clinmedicine.3-5-481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
34
|
Dickinson R, Awaiz S, Whittington MA, Lieb WR, Franks NP. The effects of general anaesthetics on carbachol-evoked gamma oscillations in the rat hippocampus in vitro. Neuropharmacology 2003; 44:864-72. [PMID: 12726818 DOI: 10.1016/s0028-3908(03)00083-2] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.3] [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: 11/23/2022]
Abstract
The effects of general anaesthetics and temperature on carbachol-evoked gamma oscillations in the rat hippocampal brain slice preparation were investigated. The frequency of the oscillations was found to be dependent on temperature in the range 32-25 degrees C, with a linear reduction in frequency from 40-17 Hz over this temperature range. The volatile anaesthetics isoflurane and halothane, and the intravenous anaesthetics thiopental, propofol and R(+)-etomidate caused a reduction in the frequency of the oscillations, in a concentration-dependent manner, over a range of clinically relevant concentrations. On the other hand, the intravenous agent ketamine and the "inactive" S(-)-isomer of etomidate had no significant effect on the oscillation frequency. The oscillations were markedly asymmetric over one cycle with a relatively rapid "rising" phase followed by a slower "decaying" phase. The decrease in oscillation frequency was due to an increase in the time-course of the "decaying phase" of the oscillation with little effect on the "rising" phase, consistent with the idea that carbachol-evoked gamma oscillations are trains of GABAergic inhibitory postsynaptic potentials and that the anaesthetics are acting postsynaptically at the GABA(A) receptor.
Collapse
Affiliation(s)
- R Dickinson
- Biophysics Group, Imperial College of Science, Technology & Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BW, UK.
| | | | | | | | | |
Collapse
|
35
|
Winn M, Reilly EB, Liu G, Huth JR, Jae HS, Freeman J, Pei Z, Xin Z, Lynch J, Kester J, von Geldern TW, Leitza S, DeVries P, Dickinson R, Mussatto D, Okasinski GF. Discovery of novel p-arylthio cinnamides as antagonists of leukocyte function-associated antigen-1/intercellular adhesion molecule-1 interaction. 4. Structure-activity relationship of substituents on the benzene ring of the cinnamide. J Med Chem 2001; 44:4393-403. [PMID: 11728185 DOI: 10.1021/jm0103108] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [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: 11/29/2022]
Abstract
We have shown that p-arylthio cinnamides can inhibit the interaction of LFA-1 and ICAM-1, which is involved in cell adhesion and the inflammatory process. We now show that 2,3-disubstitution on the aryl portion of the cinnamide results in enhanced activity over mono substitution on the ring. The best 2,3-substituents were chlorine and trifluoromethyl groups. Compounds 39 and 40 which contain two CF3 groups have IC(50) values of 0.5 and 0.1 nM, respectively, in inhibiting JY8 cells expressing LFA-1 on their surface, from adhering to ICAM-1. The structure-activity relationship (SAR) was examined using an NMR based model of the LFA-1 I domain/compound 31 complex. One of our compounds (38) was able to reduce cell migration in two different in vivo experiments.
Collapse
Affiliation(s)
- M Winn
- Metabolic Disease Research, Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, Illinois 60064-6098, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Abstract
OBJECTIVE While etomidate is reported as a procedural sedative in adults, its use in children has not been extensively reported. The authors describe their experience with etomidate for procedural sedation in children with extremity fractures and major joint dislocations. METHODS This was a retrospective descriptive chart review. The setting was a university-based emergency department (ED) that follows national guidelines for procedural sedation. Subjects were children less than 18 years old who received etomidate prior to fracture reduction or major joint dislocations. Standardized data were abstracted from the medical records, including patient demographics, diagnosis, weight, types and doses of sedative and analgesic agents used, number of boluses of etomidate, attempts at reduction, complications encountered, vitals signs before, during, and after the reduction, disposition, and the time from procedure to discharge. Descriptive statistics calculated included means and proportions with 95% confidence intervals. RESULTS Fifty-three children received etomidate for fracture reduction. Their mean age was 9.7; 41.5% were females. Indications for reduction included forearm fractures (38), ankle fractures (12), upper arm fractures (2), and hip dislocations (1). In most cases (83%) reduction was successful after one attempt only. The mean initial and total doses of etomidate were 0.20 mg/kg (range, 0.1 to 0.4) and 0.24 mg/kg (range, 0.13 to 0.52), respectively. Thirteen patients required a second bolus of etomidate or midazolam. Thirty-four patients (64%) were discharged from the ED after a mean observation of 94 minutes (range, 35 to 255). There were no major adverse events (95% CI = 0% to 5.7%). One patient reported nausea and one required a fluid bolus for hypotension. One patient receiving multiple sedatives and opioid analgesics was admitted for observation due to prolonged sedation. No patient required assisted ventilation or intubation. CONCLUSIONS These results suggest that etomidate is a safe and effective agent for procedural sedation in children requiring fracture and major joint reductions.
Collapse
Affiliation(s)
- R Dickinson
- Department of Emergency Medicine, State University of New York at Stony Brook, Stony Brook, NY, USA
| | | | | |
Collapse
|
37
|
Abstract
BACKGROUND Although it is accepted widely that optically active intravenous general anesthetics produce stereoselective effects in animals, the situation regarding volatile agents is confused. Conventional studies with scarce isoflurane enantiomers have been limited to small numbers of animals and produced conflicting results. By injecting these volatile enantiomers intravenously, however, it is possible to study large numbers of animals and obtain reliable results that can help to identify the molecular targets for isoflurane. METHODS Pure isoflurane enantiomers were administered intravenously to rats after solubilization in a lipid emulsion. The ability of each enantiomer to produce a loss of righting reflex was determined as a function of dose, and quantal dose-response curves were constructed. In addition, sleep times were recorded with each enantiomer. Chiral gas chromatography was used to measure relative enantiomer concentrations in the brains of rats injected with racemic isoflurane. RESULTS The S(+)-enantiomer was 40 +/- 8% more potent than the R(-)-enantiomer at producing a loss of righting reflex. The S(+)-enantiomer induced longer sleep times (by about 50%) than did the R(-)-enantiomer. Rats anesthetized by a dose of racemic isoflurane sufficient to achieve a half-maximal effect had essentially identical brain concentrations of the two enantiomers. CONCLUSIONS The S(+)-enantiomer of the general anesthetic isoflurane is significantly (P < 0.001) more potent than the R(-)-enantiomer at causing a loss of righting reflex in rats. This confirms the view that isoflurane acts by binding to chiral sites. The observed degree of stereoselectivity provides a useful guide for ascertaining from in vitro experiments which molecular targets are most likely to play major roles in the loss of righting reflex caused by isoflurane.
Collapse
Affiliation(s)
- R Dickinson
- Biophysics Section, The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London, United Kingdom
| | | | | | | |
Collapse
|
38
|
Abstract
BACKGROUND The mechanisms by which the inhalational general anesthetics isoflurane and xenon exert their effects are unknown. Moreover, there have been surprisingly few quantitative studies of the effects of these agents on central synapses, with virtually no information available regarding the actions of xenon. METHODS The actions of isoflurane and xenon on gamma-aminobutyric acid-mediated (GABAergic) and glutamatergic synapses were investigated using voltage-clamp techniques on autaptic cultures of rat hippocampal neurons, a preparation that avoids the confounding effects of complex neuronal networks. RESULTS Isoflurane exerts its greatest effects on GABAergic synapses, causing a marked increase in total charge transfer (by approximately 70% at minimum alveolar concentration) through the inhibitory postsynaptic current. This effect is entirely mediated by an increase in the slow component of the inhibitory postsynaptic current. At glutamatergic synapses, isoflurane has smaller effects, but it nonetheless significantly reduces the total charge transfer (by approximately 30% at minimum alveolar concentration) through the excitatory postsynaptic current, with the N-methyl-D-aspartate (NMDA) and alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)/kainate receptor-mediated components being roughly equally sensitive. Xenon has no measurable effect on GABAergic inhibitory postsynaptic currents or on currents evoked by exogenous application of GABA, but it substantially inhibits total charge transfer (by approximately 60% at minimum alveolar concentration) through the excitatory postsynaptic current. Xenon selectively inhibits the NMDA receptor-mediated component of the current but has little effect on the AMPA/kainate receptor-mediated component. CONCLUSIONS For both isoflurane and xenon, the most important targets appear to be postsynaptic. The authors' results show that isoflurane and xenon have very different effects on GABAergic and glutamatergic synaptic transmission, and this may account for their differing pharmacologic profiles.
Collapse
Affiliation(s)
- S L de Sousa
- The Blackett Laboratory, Imperial College of Science, Technology, and Medicine, London, United Kingdom
| | | | | | | |
Collapse
|
39
|
Farhadieh RD, Gianoutsos MP, Dickinson R, Walsh WR. Effect of distraction rate on biomechanical, mineralization, and histologic properties of an ovine mandible model. Plast Reconstr Surg 2000; 105:889-95. [PMID: 10724247 DOI: 10.1097/00006534-200003000-00010] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [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: 11/26/2022]
Abstract
Craniofacial microsomia is a common congenital malformation. Ilizarov's method of distraction osteogenesis applied to the mandible has yielded promising results both experimentally and clinically. Because the technique is used predominantly in a pediatric population, length of treatment and compliance may be problematic. To date, the limits of distraction rate in the craniofacial skeleton have not been defined. This study was designed to investigate the effects of distraction rate, in a large animal model, on the mineralization, biomechanical, and histologic properties of lengthened mandibles. Clinically faster distraction rates would decrease the overall treatment time. Twenty-four animals were divided into four groups, with varying rates of distraction (1, 2, 3, and 4 mm/day). A uniaxial distractor at the angle of the mandible was used. The mandibles were lengthened to 24 mm and fixed for a period of 5 weeks, when the animals were killed. The specimens were analyzed with respect to mineralization using dual energy x-ray absorptiometry, biomechanical strength, through a modified three-point bending test, and histologic properties with hematoxylin and eosin stains. Biomechanical, mineralization, and histologic analyses of the samples indicated that group 1 (1 mm/day) samples were significantly superior (p<0.05) to those of group 4 (4 mm/day). Although bone formation was achieved in all groups, group 1 (1 mm/day) demonstrated the strongest biomechanical and histologic properties. Bone mineral density obtained using dual energy x-ray absorptiometry may be clinically useful as a reliable, noninvasive, and relatively cheap predictor for removal time of the fixator.
Collapse
Affiliation(s)
- R D Farhadieh
- Division of Surgery, Prince of Wales Hospital, University of New South Wales, Sydney, Australia
| | | | | | | |
Collapse
|
40
|
Farhadieh RD, Dickinson R, Yu Y, Gianoutsos MP, Walsh WR. The role of transforming growth factor-beta, insulin-like growth factor I, and basic fibroblast growth factor in distraction osteogenesis of the mandible. J Craniofac Surg 1999; 10:80-6. [PMID: 10388431 DOI: 10.1097/00001665-199901000-00016] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.6] [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: 11/26/2022] Open
Abstract
Distraction osteogenesis is a viable method for regenerating large amounts of bone. In contrast to fracture healing, the mode of bone formation in distraction osteogenesis is primarily intramembranous ossification. The basic biology of the process is still not well understood. The growth factor cascade is likely to play an important role in distraction. This study examines the growth factor cascade in a lengthened ovine mandible model. Twenty-four animals were divided into four groups with varying rates of distraction (1, 2, 3, and 4 mm/day). A unilateral distractor at the angle of the mandible was used. The mandibles were lengthened to 24 mm and fixed for a period of 5 weeks, after which the animals were killed. The sections were probed for transforming growth factor-beta, basic fibroblast growth factor, and insulin-like growth factor I. The growth factors studied were present in all four groups. Transforming growth factor-beta, basic fibroblast growth factor, and insulin-like growth factor I were present in both the bony matrix of the sections and the cytoplasm of the cells, osteoblasts, and a small number of mesenchymal cells. The sections obtained from groups distracted at faster rates showed stronger presence of the growth factors examined by more intense staining. In fracture healing, the localization of transforming growth factor-beta in stage I of healing corresponded with the precise region of intramembranous ossification in stage II. Diffuse presence of transforming growth factor-beta throughout the lengthened region corresponded with the process of intramembranous ossification observed in distraction. In fracture healing, insulin-like growth factor I and basic fibroblast growth factor have been shown to promote proliferation and differentiation of osteoblasts from precursor cells. The intense presence of insulin-like growth factor I and basic fibroblast growth factor in the distracted region may account for osteoblast proliferation and formation from precursor mesenchymal cells. Mechanical strain has been shown to increase the expression of transforming growth factor-beta and insulin-like growth factor I. Distraction may serve as a source of mechanical strain, which may explain, in part, the expression of these growth factors, particularly in the faster groups.
Collapse
Affiliation(s)
- R D Farhadieh
- Division of Surgery, Prince of Wales Hospital, Sydney, New South Wales, Australia
| | | | | | | | | |
Collapse
|
41
|
Abstract
Activated mitogen-activated protein (MAP) kinases play an essential role controlling many neuronal functions. Dual specificity protein phosphatases (DS-PTPs) elicit selective inactivation of MAP kinases and are under tight transcriptional control. We have studied expression of four DS-PTPs (MKP-1, MKP-X, MKP-3 and B23) in rat brain and examined changes during post-natal development and following kainic acid induced seizure activity. In normal adult brain these DS-PTPs exhibit a strikingly different expression pattern. Only MKP-1 was regulated during development with levels increased transiently (P15-P21) within the thalamus and somatosensory cortex. Following kainate treatment, MKP-1, MKP-3 and B23 all exhibit striking changes in expression within hippocampal subfields CA1-3 and dentate gyrus. Regulated transcription of DS-PTPs may play a critical role controlling MAP kinase dependent processes including synaptic remodeling and neuronal death.
Collapse
Affiliation(s)
- U Boschert
- Serono Pharmaceutical Research Institute, Serono International S.A., Geneva, Switzerland
| | | | | | | | | |
Collapse
|
42
|
|
43
|
Abstract
An imbalance between proliferation and apoptosis is an important causal factor for disorders involving abnormal cell accumulation. Endothelin (ET)-1, a 21-amino-acid peptide with mitogenic and vasoconstricting activities, not only acts as a mitogen, but also attenuates paclitaxel-induced apoptosis in smooth muscle cells. In both human pericardial and prostatic smooth muscle cells, addition of ET-1 reduced paclitaxel-induced DNA fragmentation and phosphatidylserine on the cell surface, two characteristics of apoptosis. By comparison, angiotensin II, another vasoactive peptide, did not have a significant effect on apoptosis. The effect of ET-1 was dose-dependent with an EC50 of 1 nM. These results suggest that ET is a potential survival factor for smooth muscle cells, and that altered activity of the ET system in disease states has potential to contribute to aberrant cell growth.
Collapse
Affiliation(s)
- J R Wu-Wong
- Pharmaceutical Products Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064-3500, USA
| | | | | | | |
Collapse
|
44
|
Abstract
Recurrent seizure activity leads to delayed neuronal death as well as to inflammatory responses involving microglia in hippocampal subfields CA1, CA3 and CA4. Since mitogen activated protein (MAP) kinases control neuronal apoptosis and trigger generation of inflammatory cytokines, their activation state could determine seizure-related brain damage. PAC1 is a dual specificity protein phosphatase inactivating MAP kinases which we have found to be undetectable in normal brain. Despite this, kainic acid-induced seizure activity lead to rapid (approximately 3 h) but transient appearance of PAC1 mRNA in granule cells of the dentate gyrus as well as in pyramidal CA1 neurons. This pattern changed with time and after 2-3 days PAC1 was induced in dying CA1 and CA3 neurons. At this time PAC1 mRNA was also expressed in white matter microglia as well as in microglia invading the damaged hippocampus. PAC1 may play an important role controlling MAP kinase involvement in both neuronal death and neuro-inflammation following excitotoxic damage.
Collapse
Affiliation(s)
- U Boschert
- Geneva Biomedical Research Institute, Glaxo Wellcome Research and Development SA, Switzerland
| | | | | | | | | |
Collapse
|
45
|
Boschert U, O'Shaughnessy C, Dickinson R, Tessari M, Bendotti C, Catsicas S, Pich EM. Developmental and plasticity-related differential expression of two SNAP-25 isoforms in the rat brain. J Comp Neurol 1996; 367:177-93. [PMID: 8708003 DOI: 10.1002/(sici)1096-9861(19960401)367:2<177::aid-cne2>3.0.co;2-2] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.8] [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: 02/01/2023]
Abstract
In this article we study the relationship between the expression pattern of two recently identified isoforms of the 25-kD synaptosomal-associated protein (SNAP-25a and SNAP-25b) and the morphological changes inherent to neuronal plasticity during development and kainic acid treatment. SNAP-25 has been involved in vescicle fusion in the nerve terminal, and most likely participates in different membrane fusion-related processes, such as those involved in neurotransmitter release and axonal growth. In the adult brain, SNAP-25b expression exceeded SNAP-25a in distribution and intensity, being present in most brain structures . Moderate or high levels of SNAP-25a hybridization signal were found in neurons of the olfactory bulb, the layer Va of the frontal and parietal cortices, the piriform cortex, the subiculum and the hippocampal CA4 field, the substantia nigra/pars compacta, and the pineal gland, partially overlapping SNAP-25b mRNA distribution. In restricted regions of cerebral cortex, thalamus, mammillary bodies, substantia nigra, and pineal glands the two isoforms were distributed in reciprocal fashion. During development SNAP-25a mRNA was the predominant isoform, whereas SNAP-25b expression increased postnatally. The early expression of SNAP-25a in the embryo and the decrease after P21 is suggestive of a potential involvement of this isoform in axonal growth and/or synaptogenesis. This conclusion is indirectly supported by the observation that SNAP-25a mRNA, but not SNAP-25b mRNA, was upregulated in the granule cells of the adult dentate gyrus 48 hours after kainate-induced neurotoxic damage of the hippocampal CA3-CA4 regions. Increase of SNAP-25 immunoreactivity was observed as early as 4 days after kainate injection within the mossy fiber terminals of the CA3 region, and in the newly formed mossy fiber aberrant terminals of the supragranular layer. These data suggest an isoform-specific role of SNAP-25 in neural plasticity.
Collapse
Affiliation(s)
- U Boschert
- Glaxo Institute for Molecular Biology, Geneva, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
46
|
Muda M, Boschert U, Dickinson R, Martinou JC, Martinou I, Camps M, Schlegel W, Arkinstall S. MKP-3, a novel cytosolic protein-tyrosine phosphatase that exemplifies a new class of mitogen-activated protein kinase phosphatase. J Biol Chem 1996; 271:4319-26. [PMID: 8626780 DOI: 10.1074/jbc.271.8.4319] [Citation(s) in RCA: 284] [Impact Index Per Article: 10.1] [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: 01/31/2023] Open
Abstract
MKP-1 (also known as CL100, 3CH134, Erp, and hVH-1) exemplifies a class of dual-specificity phosphatase able to reverse the activation of mitogen-activated protein (MAP) kinase family members by dephosphorylating critical tyrosine and threonine residues. We now report the cloning of MKP-3, a novel protein phosphatase that also suppresses MAP kinase activation state. The deduced amino acid sequence of MKP-3 is 36% identical to MKP-1 and contains the characteristic extended active-site sequence motif VXVHCXXGXSRSXTXXXAYLM (where X is any amino acid) as well as two N-terminal CH2 domains displaying homology to the cell cycle regulator Cdc25 phosphatase. When expressed in COS-7 cells, MKP-3 blocks both the phosphorylation and enzymatic activation of ERK2 by mitogens. Northern analysis reveals a single mRNA species of 2.7 kilobases with an expression pattern distinct from other dual-specificity phosphatases. MKP-3 is expressed in lung, heart, brain, and kidney, but not significantly in skeletal muscle or testis. In situ hybridization studies of MKP-3 in brain reveal enrichment within the CA1, CA3, and CA4 layers of the hippocampus. Metrazole-stimulated seizure activity triggers rapid (<1 h) but transient up-regulation of MKP-3 mRNA in the cortex, piriform cortex, and some amygdala nuclei. Metrazole stimulated similar regional up-regulation of MKP-1, although this was additionally induced within the thalamus. MKP-3 mRNA also undergoes powerful induction in PC12 cells after 3 h of nerve growth factor treatment. This response appears specific insofar as epidermal growth factor and dibutyryl cyclic AMP fail to induce significant MKP-3 expression. Subcellular localization of epitope-tagged MKP-3 in sympathetic neurons reveals expression in the cytosol with exclusion from the nucleus. Together, these observations indicate that MKP-3 is a novel dual-specificity phosphatase that displays a distinct tissue distribution, subcellular localization, and regulated expression, suggesting a unique function in controlling MAP kinase family members. Identification of a second partial cDNA clone (MKP-X) encoding the C-terminal 280 amino acids of an additional phosphatase that is 76% identical to MKP-3 suggests the existence of a distinct structurally homologous subfamily of MAP kinase phosphatases.
Collapse
Affiliation(s)
- M Muda
- Glaxo Institute for Molecular Biology, CH-1228 Plan-les-Ouates, Geneva, Switzerland
| | | | | | | | | | | | | | | |
Collapse
|
47
|
Dickinson R, Lieb WR, Franks NP. The effects of temperature on the interactions between volatile general anaesthetics and a neuronal nicotinic acetylcholine receptor. Br J Pharmacol 1995; 116:2949-56. [PMID: 8680729 PMCID: PMC1909207 DOI: 10.1111/j.1476-5381.1995.tb15949.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 02/01/2023] Open
Abstract
1. Completely isolated identified neurones from the right parietal ganglion of the pond snail Lymnaea stagnalis were investigated under two-electrode voltage clamp. Neuronal nicotinic acetylcholine receptor (AChR) currents were studied at low acetylcholine concentrations (< or = 200 nM). 2. Inhibition of the ACh-induced currents by three volatile general anaesthetics (halothane, isoflurane and methoxyflurane) and the specific inhibitor (+)-tubocurarine was studied as a function of temperature (over the range 4-25 degrees C). 3. The inhibition by the volatile anaesthetics increased (inhibition constants decreased) with decreasing temperature while the inhibition by (+)-tubocurarine did not change significantly near room temperature, but decreased at lower temperatures. The (+)-tubocurarine inhibition appeared to be competitive in nature and showed no significant voltage-dependence. 4. The van't Hoff plots (logarithms of the dissociation constants against reciprocal absolute temperature) were linear for the anaesthetics, but markedly non-linear for (+)-tubocurarine. From these plots, values for the changes in the standard Gibbs free energy delta G degrees water-->AChR, enthalpy delta H degree water-->AChR, entropy delta S degree water-->AChR and heat capacity delta Cp degree water-->AChR were determined. Tubocurarine was found to bind very much tighter to the receptor than the volatile anaesthetics due, entirely, to a favourable increase in entropy on binding. 5. A comparison between the temperature-dependence of the anaesthetic inhibition of the ACh receptor and that of general anaesthetic potencies in animals indicates that the temperature-dependence of animal potencies might be simply accounted for in terms of changes in anaesthetic/receptor binding.
Collapse
Affiliation(s)
- R Dickinson
- Biophysics Section, Blackett Laboratory, Imperial College of Science, Technology and Medicine, South Kensington, London
| | | | | |
Collapse
|
48
|
Bartolazzi A, Jackson D, Bennett K, Aruffo A, Dickinson R, Shields J, Whittle N, Stamenkovic I. Regulation of growth and dissemination of a human lymphoma by CD44 splice variants. J Cell Sci 1995; 108 ( Pt 4):1723-33. [PMID: 7542258 DOI: 10.1242/jcs.108.4.1723] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [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: 11/20/2022] Open
Abstract
CD44 is a polymorphic cell surface glycoprotein, currently proposed to be the principal cell surface receptor for hyaluronan. However, different isoforms of CD44, expressed in human lymphoid tumor cells, appear to have distinct effects on the ability of the cells to attach to hyaluronan-coated surfaces and on their capacity to form tumors in vivo. In the present study, we address the mechanisms that may regulate CD44 isoform-dependent adhesion to hyaluronan. We use a human Burkitt lymphoma, stably transfected with six different alternatively spliced human CD44 isoforms, to determine their potential hyaluronan binding and tumor growth promoting roles. We show that transfectants expressing CD44 splice variants that contain variable exons 6–10, 7–10 and 8–10 adhere to hyaluronan-coated surfaces weakly and that corresponding tumor formation in vivo is delayed with respect to CD44-negative parental cell-derived tumors. Abundant shedding of these three isoforms may play a significant role in determining the rate of tumor development. Transfectants expressing variable exon 3, on the other hand, fail to display CD44-mediated adhesion to hyaluronan, but form bone marrow tumors rapidly following intravenous injection. These observations suggest that different mechanisms regulate CD44-mediated adhesion and tumor growth, and provide evidence that expression of exon v3 may confer novel ligand-binding properties.
Collapse
Affiliation(s)
- A Bartolazzi
- Department of Pathology, Massachusetts General Hospital, Charlestown 02129, USA
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Jackson DG, Bell JI, Dickinson R, Timans J, Shields J, Whittle N. Proteoglycan forms of the lymphocyte homing receptor CD44 are alternatively spliced variants containing the v3 exon. J Cell Biol 1995; 128:673-85. [PMID: 7532175 PMCID: PMC2199896 DOI: 10.1083/jcb.128.4.673] [Citation(s) in RCA: 193] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The CD44 cell surface glycoprotein is expressed on a broad range of different tissues as multiple isoforms containing from one to ten alternatively spliced exons v1-v10 inserted within the extracellular domain. Differential glycosylation generates still further variability, yielding both N- and O-glycan-modified forms of CD44 in addition to proteoglycan-like variants containing chondroitin sulphate and heparan sulphate. These high molecular mass proteoglycan-like variants, previously identified in lymphocytes, melanomas, and keratinocytes have been implicated in cell-matrix adhesion, cell motility, and invasiveness. More recently, monocyte CD44 molecules presumed to carry glycosaminoglycan chains were shown to bind the chemokine MIP-1 beta (Tanaka, Y.,D. H. Adams, S. Hubscher, H. Hirano, U. Siebenlist, and S. Shaw. 1993. Nature (Lond). 361:79-82.) raising the intriguing possibility that proteoglycan-like CD44 variants might play a role in regulating inflammatory responses. Here we have investigated the molecular identity of these proteoglycan-like CD44 variants by generating a panel of recombinant CD44 isoforms using a novel cassette cloning strategy. We show that both chondroitin and heparan sulphate modifications are associated specifically with isoforms (CD44v3-10 and CD44v3,8-10) containing the v3 alternative exon which encodes a consensus motif SGXG for GAG addition. Other isoforms (CD44v10, CD44v8-10, CD44v7-10, and CD44v6-10) are shown to lack these GAG chains but to carry extensive O-glycan modifications, most likely within the mucin-like alternative exon inserts. We also demonstrate that the majority of endogenous GAG-modified CD44 isoforms present in epithelial cells constitute v3 isoforms thus establishing that in these cells the majority of proteoglycan-like CD44 variants are generated by alternative splicing. Finally we present evidence using transfected B lymphoma cells that the GAG-modified CD44 isoforms CD44v3-10 and CD44v3,8-10, unlike CD44H, bind only weakly to hyaluronan. Together with the demonstration in the accompanying paper (Bennett, K., D. G. Jackson, J.C. Simon, E. Tanczos, R. Peach, B. Modrell, I. Stamenkovic, G. Plowman, and A. Aruffo. 1995. J. Cell Biol. 128:687-698.), that CD44 molecules containing the v3 exon bind growth factors, these results highlight a new and potentially important role for CD44 alternative splicing in the control of cell-surface proteoglycan expression.
Collapse
Affiliation(s)
- D G Jackson
- Molecular Immunology Group, John Radcliffe Hospital, University of Oxford
| | | | | | | | | | | |
Collapse
|
50
|
Abstract
Isoflurane is an inhalational general anesthetic widely used in surgical operations as a racemic mixture of its two optical isomers. The recent availability of pure enantiomers of isoflurane has encouraged their use in experimental studies, and stereoselective effects have now been observed on anesthetic-sensitive neuronal ion channels. Although it has been assumed that such chiral effects demonstrate direct interactions with proteins, it is possible that they could be due to stereoselective interactions with chiral membrane lipids. We have determined the partition coefficients of the two optical isomers of isoflurane between lipid bilayers and water, using racemic isoflurane and gas chromatography with a chiral column. For lipid bilayers of phosphatidylcholine (PC) and 4 mol% phosphatidic acid (PA), both with and without cholesterol (CHOL), we found equal partitioning of the isoflurane optical isomers. The ratios of the S(+) to R(-) isoflurane partition coefficients were (mean +/- SEM): 1.018 +/- 0.010 for bilayers of PC/CHOL/PA (mole ratios 56:40:4) and 1.011 +/- 0.002 for bilayers of PC/PA (mole ratio 96:4). Molar partition coefficients for racemic isoflurane were 49 +/- 4 and 165 +/- 10, respectively. These findings support the view that the stereoselective effects on ion channels observed with isoflurane are due to direct actions on proteins rather than lipids.
Collapse
Affiliation(s)
- R Dickinson
- Biophysics Section, Imperial College of Science, Technology and Medicine, London, United Kingdom
| | | | | |
Collapse
|