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Shivley CB, Spronk T, Green AL, Vuolo M, Ruesch L, Edler R, Haley C, Scaria J, Hennings J, Dee S. Antimicrobial use and antimicrobial resistance monitoring in pig production in the United States of America. REV SCI TECH OIE 2023; 42:52-64. [PMID: 37232319 DOI: 10.20506/rst.42.3348] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Monitoring antimicrobial use (AMU) and antimicrobial resistance (AMR) on farms is recognised as an important component of antimicrobial stewardship, yet the process can be resource intensive. This paper describes a subset of findings from the first year of a collaboration across government, academia and a private sector veterinary practice focused on swine production in the Midwestern United States. The work is supported by participating farmers and the greater swine industry. Twice-annual collection of samples from pigs along with AMU monitoring occurred on 138 swine farms. Detection and resistance of Escherichia coli from pig tissues was assessed, and associations between AMU and AMR were evaluated. This paper describes the methods utilised and the first-year E. coli-related results from this project. Higher minimum inhibitory concentrations (MIC) for enrofloxacin and danofloxacin in E. coli from swine tissues were associated with the purchase of fluoroquinolones. There were no other significant associations between MIC and AMU combinations in E. coli isolated from pig tissues. This project represents one of the first attempts to monitor AMU as well as AMR in E. coli in a large-scale commercial swine system in the United States of America.
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Farrell SM, Pereira EAC, Brown MRD, Green AL, Aziz TZ. Neuroablative surgical treatments for pain due to cancer. Neurochirurgie 2020; 67:176-188. [PMID: 33129802 DOI: 10.1016/j.neuchi.2020.10.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 09/21/2020] [Accepted: 10/16/2020] [Indexed: 12/20/2022]
Abstract
Cancer pain is common and challenging to manage - it is estimated that approximately 30% of cancer patients have pain that is not adequately controlled by analgesia. This paper discusses safe and effective neuroablative treatment options for refractory cancer pain. Current management of cancer pain predominantly focuses on the use of medications, resulting in a relative loss of knowledge of these surgical techniques and the erosion of the skills required to perform them. Here, we review surgical methods of modulating various points of the neural axis with the aim to expand the knowledge base of those managing cancer pain. Integration of neuroablative approaches may lead to higher rates of pain relief, and the opportunity to dose reduce analgesic agents with potential deleterious side effects. With an ever-increasing population of cancer patients, it is essential that neurosurgeons maintain or train in these techniques in tandem with the oncological multi-disciplinary team.
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Affiliation(s)
- S M Farrell
- Nuffield Department of Clinical Sciences, John-Radcliffe Hospital, OX3 9DU Oxford, United Kingdom; The Royal Free London NHS Foundation Trust, London, United Kingdom.
| | - E A C Pereira
- Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St George's University of London, London, United Kingdom.
| | - M R D Brown
- The Royal Marsden Hospital NHS Foundation Trust, London, United Kingdom; The Institute of Cancer Research, London, United Kingdom.
| | - A L Green
- Nuffield Department of Clinical Sciences, John-Radcliffe Hospital, OX3 9DU Oxford, United Kingdom.
| | - T Z Aziz
- Nuffield Department of Clinical Sciences, John-Radcliffe Hospital, OX3 9DU Oxford, United Kingdom.
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Green AL, Debrah E, Roy HA, Rebelo P, Moosavi SH. Letter to the editor: Thalamic deep brain stimulation may relieve breathlessness in COPD. Brain Stimul 2019; 12:827-828. [PMID: 30867117 DOI: 10.1016/j.brs.2019.02.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 02/20/2019] [Accepted: 02/22/2019] [Indexed: 11/17/2022] Open
Affiliation(s)
- A L Green
- Nuffield Department of Surgical Sciences, University of Oxford, UK.
| | - E Debrah
- Nuffield Department of Surgical Sciences, University of Oxford, UK; Cardiorespiratory Research Group, Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, UK.
| | - H A Roy
- Nuffield Department of Surgical Sciences, University of Oxford, UK.
| | - P Rebelo
- Nuffield Department of Surgical Sciences, University of Oxford, UK.
| | - S H Moosavi
- Cardiorespiratory Research Group, Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, UK.
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Abstract
The aim of this study was to determine the efficacy of deep brain stimulation (DBS) in the treatment of various types of intractable head and facial pains. Seven patients underwent the insertion of DBS electrodes into the periventricular/periaqueductal grey region and/or the ventroposteromedial nucleus of the thalamus. We have shown statistically significant improvement in pain scores (visual analogue and McGill's) as well as health-related quality of life (SF-36v2) following surgery. There is wide variability in patient outcomes but, overall, DBS can be an effective treatment. Our results are compared with the published literature and electrode position for effective analgesia is discussed.
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Affiliation(s)
- A L Green
- Department of Neurosurgery, Radcliffe Infirmary, and University of Oxford, Department of Physiology, UK.
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Kallingappa PK, Turner PM, Eichenlaub MP, Green AL, Oback FC, Chibnall AM, Wells DN, Oback B. Quiescence Loosens Epigenetic Constraints in Bovine Somatic Cells and Improves Their Reprogramming into Totipotency. Biol Reprod 2016; 95:16. [DOI: 10.1095/biolreprod.115.137109] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 05/17/2016] [Indexed: 11/01/2022] Open
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Green AL, Oback FC, Oliver JE, Popovic L, McGowan LT, Appleby SJ, Meng F, Hyndman DL, Carson D, Wells DN. 28 DOUBLING OOCYTE CYTOPLASM VOLUME INCREASES BLASTOCYST QUALITY FOLLOWING INTERSPECIES SOMATIC CELL NUCLEAR TRANSFER IN ARGALI SHEEP (OVIS AMMON). Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab28] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Interspecies somatic cell NT (SCNT) can be used in the conservation of endangered animals but only when there is an abundant source of compatible oocytes and recipients. The objective of this study was to compare the efficiency of intra- and interspecies SCNT in sheep using zona-free embryo reconstruction methods. Skin fibroblasts from either an argali (Ovis ammon) or control (Ovis aries) ram were used as donor cells for SCNT between passages 2 to 5 and following culture in medium containing 0.5% FCS for 4 to 6 days. Single cells were electrically fused to cytoplasts prepared following enucleation of in vitro-matured zona-free metaphase II-arrested oocytes obtained from domestic ewes. In an additional experiment with argali, a double cytoplast (DC-SCNT) procedure was used whereby a second cytoplast was fused to the first reconstruct within 1 h. Reconstructs were artificially activated ~25 h after the start of maturation using ionomycin and 6-DMAP. Zona-free parthenogenote (PG) control oocytes were activated around the same time. In each treatment, 10 to 12 zona-free embryos where cultured in microwells formed in 20-μL drops of modified synthetic oviduct fluid under oil. Half the medium was replaced on Day 3, and developing embryos were transferred to individual 5-μL drops on Day 6. Development on Day 7 was expressed as a percentage of cleaved embryos. Statistical significance was determined using Fisher’s exact test for embryo development and two-tailed t-test for embryo cell numbers. Total embryo development on Day 7 was significantly greater with intraspecies sheep SCNT compared with interspecies argali SCNT (34/157 = 21.7% v. 34/363 = 9.4%, respectively; P < 0.001). Moreover, SCNT embryo development was significantly less than PG controls (122/360 = 33.9%; P < 0.001). Although argali DC-SCNT had no effect on total embryo development compared with SCNT (9/69 = 13.0% v. 7/56 = 12.5%, respectively), doubling cytoplasm volume increased the proportion of grade 1 and 2 embryos on Day 7 (8.7 v. 0%; P < 0.05). Consequently, DC-SCNT blastocysts had greater numbers of nuclei compared with SCNT (108 ± 47 v. 65 ± 9; n = 6, n = 6, respectively; P = 0.054). In comparison, PG blastocysts possessed on average 122 ± 27 nuclei (n = 7). A sample of 14 argali cloned blastocysts were all confirmed to have been derived from the respective ram after genotyping ~6000 ovine single nucleotide polymorphisms on a custom-made chip (Illumina, San Diego, CA, USA). Chromosome spreads of argali embryos revealed a modal number of 4 bi-armed autosomes as opposed to 6 in Ovis aries. In conclusion, in vitro development following interspecies SCNT in argali was about half that compared with domestic sheep. Blastocyst quality was improved by increasing oocyte cytoplasmic volume facilitated by zona-free cloning. Alternative sources of cytoplasm may further improve development. Confirmation that Ovis aries cytoplasm can fully reprogram a differentiated argali nucleus remains to be determined.
This research was supported by AgResearch Core Funding.
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deSouza RM, Akram H, Low HL, Green AL, Ashkan K, Schapira AHV. The timing of deep brain stimulation for Parkinson disease in the UK from 1997 to 2012. Eur J Neurol 2015; 22:1415-7. [DOI: 10.1111/ene.12795] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 04/22/2015] [Indexed: 11/27/2022]
Affiliation(s)
- R. M. deSouza
- Department of Neurosurgery; Kings College Hospital; London UK
| | - H. Akram
- Victor Horsley Department of Neurosurgery; National Hospital for Neurology and Neurosurgery; London UK
- Department of Clinical Neurosciences; UCL Institute of Neurology; London UK
| | - H. L. Low
- Department of Neurosurgery; Queens Hospital Romford; Essex UK
| | - A. L. Green
- Department of Neurosurgery; John Radcliffe Hospital; Oxford UK
| | - K. Ashkan
- Department of Neurosurgery; Kings College Hospital; London UK
| | - A. H. V. Schapira
- Department of Clinical Neurosciences; UCL Institute of Neurology; London UK
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Norton DM, Brown LG, Frick R, Carpenter LR, Green AL, Tobin-D'Angelo M, Reimann DW, Blade H, Nicholas DC, Egan JS, Everstine K. Managerial practices regarding workers working while ill. J Food Prot 2015; 78:187-95. [PMID: 25581195 PMCID: PMC5578441 DOI: 10.4315/0362-028x.jfp-14-134] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [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: 11/11/2022]
Abstract
Surveillance data indicate that handling of food by an ill worker is a cause of almost half of all restaurant-related outbreaks. The U.S. Food and Drug Administration (FDA) Food Code contains recommendations for food service establishments, including restaurants, aimed at reducing the frequency with which food workers work while ill. However, few data exist on the extent to which restaurants have implemented FDA recommendations. The Centers for Disease Control and Prevention's Environmental Health Specialists Network (EHS-Net) conducted a study on the topic of ill food workers in restaurants. We interviewed restaurant managers (n = 426) in nine EHS-Net sites. We found that many restaurant policies concerning ill food workers do not follow FDA recommendations. For example, one-third of the restaurants' policies did not specifically address the circumstances under which ill food workers should be excluded from work (i.e., not be allowed to work). We also found that, in many restaurants, managers are not actively involved in decisions about whether ill food workers should work. Additionally, almost 70% of managers said they had worked while ill; 10% said they had worked while having nausea or "stomach flu," possible symptoms of foodborne illness. When asked why they had worked when ill, a third of the managers said they felt obligated to work or their strong work ethic compelled them to work. Other reasons cited were that the restaurant was understaffed or no one was available to replace them (26%), they felt that their symptoms were mild or not contagious (19%), they had special managerial responsibilities that no one else could fulfill (11%), there was non-food handling work they could do (7%), and they would not get paid if they did not work or the restaurant had no sick leave policy (5%). Data from this study can inform future research and help policy makers target interventions designed to reduce the frequency with which food workers work while ill.
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Affiliation(s)
- D M Norton
- California Emerging Infections Program, 360 22nd Street, Suite 750, Oakland, California 94612, Sonomaceuticals/WholeVine Products, 421 Aviation Boulevard, Santa Rosa, CA 95402, USA
| | - L G Brown
- National Center for Environmental Health, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, Georgia 30333, USA.
| | - R Frick
- California Department of Public Health, Food and Drug Branch, 850 Marina Bay Parkway, Building P, First Floor, Richmond, California 94808, USA; Alameda County Department of Environmental Health, 1131 Harbor Bay Parkway, 2nd Floor, Alameda, CA 94502, USA
| | - L R Carpenter
- Tennessee Department of Health, 425 5th Avenue N., # 3, Nashville, Tennessee 37243, USA
| | - A L Green
- Tennessee Department of Health, 425 5th Avenue N., # 3, Nashville, Tennessee 37243, USA; Office of Public Health Science, Food Safety and Inspection Service, U.S. Department of Agriculture, Butler Square West, Suite 989-C, 100 North 6th Street, Minneapolis, MN 55403, USA
| | - M Tobin-D'Angelo
- Georgia Department of Public Health, 2 Peachtree Street N. W., 15th Floor, Atlanta, Georgia 30303, USA
| | - D W Reimann
- Minnesota Department of Health, 625 Robert Street N., P.O. Box 64975, St. Paul, Minnesota 55164, USA
| | - H Blade
- Rhode Island Department of Health, 3 Capitol Hill, Providence, Rhode Island 02908, USA
| | - D C Nicholas
- New York State Department of Health, Corning Tower, Empire State Plaza, Albany, New York 12237, USA
| | - J S Egan
- New York State Department of Health, Corning Tower, Empire State Plaza, Albany, New York 12237, USA
| | - K Everstine
- Minnesota Department of Health, 625 Robert Street N., P.O. Box 64975, St. Paul, Minnesota 55164, USA; National Center for Food Protection and Defense, University of Minnesota, St. Paul, MN 55108, USA
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FitzGerald JJ, Rosendal F, de Pennington N, Joint C, Forrow B, Fletcher C, Green AL, Aziz TZ. Long-term outcome of deep brain stimulation in generalised dystonia: a series of 60 cases. J Neurol Neurosurg Psychiatry 2014; 85:1371-6. [PMID: 24691580 DOI: 10.1136/jnnp-2013-306833] [Citation(s) in RCA: 33] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND There is solid evidence of the long term efficacy of deep brain stimulation of the globus pallidus pars interna in the treatment of generalised dystonia. However there are conflicting reports concerning whether certain subgroups gain more benefit from treatment than others. We analysed the results of a series of 60 cases to evaluate the effects of previously proposed prognostic factors including dystonia aetiology, dystonia phenotype, age at onset of dystonia, and duration of dystonia prior to treatment. METHODS 60 patients with medically intractable primary or secondary generalised dystonia were treated with deep brain stimulation of the globus pallidus pars interna during the period 1999-2010 at the Department of Neurosurgery in Oxford, UK. Patients were assessed using the Burke-Fahn-Marsden (BFM) Dystonia Rating Scale prior to surgery, 6 months after implantation and thereafter at 1 year, 2 years and 5 years follow-up. RESULTS The group showed mean improvements in the BFM severity and disability scores of 43% and 27%, respectively, by 6 months, and this was sustained. The results in 11 patients with DYT gene mutations were significantly better than in non-genetic primary cases. The results in 12 patients with secondary dystonia were not as good as those seen in non-genetic primary cases but there remained a significant beneficial effect. Age of onset of dystonia, duration of disease prior to surgery, and myoclonic versus torsional disease phenotype had no significant effect on outcome. CONCLUSIONS The aetiology of dystonia was the sole factor predicting a better or poorer outcome from globus pallidus pars interna stimulation in this series of patients with generalised dystonia. However even the secondary cases that responded the least well had a substantial reduction in BFM scores compared with preoperative clinical assessments, and these patients should still be considered for deep brain stimulation.
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Affiliation(s)
- J J FitzGerald
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - F Rosendal
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK Department of Neurosurgery, Aarhus University Hospital, Aarhus, Denmark
| | - N de Pennington
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK
| | - C Joint
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK
| | - B Forrow
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK
| | - C Fletcher
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK
| | - A L Green
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - T Z Aziz
- Department of Neurosurgery, John Radcliffe Hospital, Oxford, UK Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
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Vargas BB, Halker RB, Starling AJ, Green AL, Hentz JG. EHMTI-0314. A window to the past: the association between inflated pain scores and a history of abuse in women with chronic migraine. J Headache Pain 2014. [PMCID: PMC4181763 DOI: 10.1186/1129-2377-15-s1-d66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sitsapesan HA, Holland P, Oliphant Z, De Pennington N, Brittain JS, Jenkinson N, Joint C, Aziz TZ, Green AL. Deep brain stimulation for tremor resulting from acquired brain injury. J Neurol Neurosurg Psychiatry 2014; 85:811-5. [PMID: 24306513 DOI: 10.1136/jnnp-2013-305340] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To evaluate the efficacy of deep brain stimulation (DBS) in the treatment of tremor resulting from acquired brain injury (ABI). METHODS A series of eight consecutive patients with post-ABI tremor were treated with DBS of the ventro-oralis posterior (VOP)/zona incerta (ZI) region, and subsequently underwent blinded assessments using Bain's tremor severity scale. RESULTS VOP/ZI DBS produced a mean reduction in tremor severity of 80.75% based on Bain's tremor severity scale, with significant reductions in all five component tremor subscores: rest, postural, kinetic, proximal and distal. No adverse neurological complications were reported, although one patient experienced exacerbation of pre-existing gait ataxia. CONCLUSION VOP/ZI stimulation is demonstrated here to be an effective and safe approach for the treatment of post-ABI tremor in the largest series published at the time of writing.
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Affiliation(s)
- H A Sitsapesan
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Nuffield Department of Surgical Sciences, Oxford University, Oxford, Oxfordshire, UK
| | - P Holland
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Nuffield Department of Surgical Sciences, Oxford University, Oxford, Oxfordshire, UK
| | - Z Oliphant
- Department of Physiology, Anatomy and Genetics, Oxford University, Oxford, Oxfordshire, UK
| | - N De Pennington
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Department of Physiology, Anatomy and Genetics, Oxford University, Oxford, Oxfordshire, UK
| | - J-S Brittain
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Oxford University, Institute for Biomedical Engineering, Oxford, Oxfordshire, UK
| | - N Jenkinson
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Nuffield Department of Surgical Sciences, Oxford University, Oxford, Oxfordshire, UK
| | - C Joint
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK
| | - T Z Aziz
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Nuffield Department of Surgical Sciences, Oxford University, Oxford, Oxfordshire, UK
| | - A L Green
- Oxford Functional Neurosurgery and Experimental Neurology, Oxford University, Oxford, Oxfordshire, UK Nuffield Department of Surgical Sciences, Oxford University, Oxford, Oxfordshire, UK
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Liu APY, Shing MMK, Yuen HL, Li CH, Ling SC, Luk CW, Ha SY, Li CK, Chan GCF, Tsui K, Gajjar A, Li C, Srivastava D, Broniscer A, Wetmore C, Kun LE, Merchant TE, Ellison DW, Orr B, Boop FA, Paul Klimo J, Ross JD, Robison LL, Armstrong GT, Walker D, Chu T, Shah A, Wilne S, Coleman M, Jaque FAM, Muthappan M, Law AJJ, Shing MMK, Chan GCF, Yuen HL, Lee RCH, Ling SC, Luk CW, Ha SY, Li CK, Mang OWS, Ngan RKC, Alston R, Estlin E, McCabe M, Birch J, Gattamaneni R, Kamaly-Asl I, Estlin E, Kamaly-Asl I, McCabe M, Birch J, Gattamaneni R, Alston R, Alston R, Estlin E, McCabe M, Gattamaneni R, Birch J, Kamaly-Asl I, Bendel A, Pond D, Woehrer A, Azizi AA, Heumesser R, Hackl M, Hainfellner JA, Dorfer C, Czech T, Chocholous M, Slavc I, Haberler C, Hami H, Ayoujil A, Habib F, Soulaymani A, Mokhtari A, Quyou A, Lim AHJ, Chan MY, Tan AM, Soh SY, Garba SM, Hami H, Zaki HM, Soulaymani A, Nouhou H, Quyou A, Owens-Pickle E, Smith A, Green AL, Schoettler M, Bandopadhayay P, Sauer N, Manley PE, Chi SN, Rodriguez-Galindo C, Kieran MW, Ribeiro K. EPIDEMIOLOGY. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou069] [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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Aaberg-Jessen C, Fogh L, Halle B, Jensen V, Brunner N, Kristensen BW, Abe T, Momii Y, Watanabe J, Morisaki I, Natsume A, Wakabayashi T, Fujiki M, Aldaz B, Fabius AWM, Silber J, Harinath G, Chan TA, Huse JT, Anai S, Hide T, Nakamura H, Makino K, Yano S, Kuratsu JI, Balyasnikova IV, Prasol MS, Kanoija DK, Aboody KS, Lesniak MS, Barone T, Burkhart C, Purmal A, Gudkov A, Gurova K, Plunkett R, Barton K, Misuraca K, Cordero F, Dobrikova E, Min H, Gromeier M, Kirsch D, Becher O, Pont LB, Kloezeman J, van den Bent M, Kanaar R, Kremer A, Swagemakers S, French P, Dirven C, Lamfers M, Leenstra S, Pont LB, Balvers R, Kloezeman J, Kleijn A, Lawler S, Leenstra S, Dirven C, Lamfers M, Gong X, Andres A, Hanson J, Delashaw J, Bota D, Chen CC, Yao NW, Chuang WJ, Chang C, Chen PY, Huang CY, Wei KC, Cheng Y, Dai Q, Morshed R, Han Y, Auffinger B, Wainwright D, Zhang L, Tobias A, Rincon E, Thaci B, Ahmed A, He C, Lesniak M, Choi YA, Pandya H, Gibo DM, Fokt I, Priebe W, Debinski W, Chornenkyy Y, Agnihotri S, Buczkowicz P, Rakopoulos P, Morrison A, Barszczyk M, Becher O, Hawkins C, Chung S, Decollogne S, Luk P, Shen H, Ha W, Day B, Stringer B, Hogg P, Dilda P, McDonald K, Moore S, Hayden-Gephart M, Bergen J, Su Y, Rayburn H, Edwards M, Scott M, Cochran J, Das A, Varma AK, Wallace GC, Dixon-Mah YN, Vandergrift WA, Giglio P, Ray SK, Patel SJ, Banik NL, Dasgupta T, Olow A, Yang X, Mueller S, Prados M, James CD, Haas-Kogan D, Dave ND, Desai PB, Gudelsky GA, Chow LML, LaSance K, Qi X, Driscoll J, Driscoll J, Ebsworth K, Walters MJ, Ertl LS, Wang Y, Berahovic RD, McMahon J, Powers JP, Jaen JC, Schall TJ, Eroglu Z, Portnow J, Sacramento A, Garcia E, Raubitschek A, Synold T, Esaki S, Rabkin S, Martuza R, Wakimoto H, Ferluga S, Tome CL, Debinski W, Forde HE, Netland IA, Sleire L, Skeie B, Enger PO, Goplen D, Giladi M, Tichon A, Schneiderman R, Porat Y, Munster M, Dishon M, Weinberg U, Kirson E, Wasserman Y, Palti Y, Giladi M, Porat Y, Schneiderman R, Munster M, Weinberg U, Kirson E, Palti Y, Gramatzki D, Staudinger M, Frei K, Peipp M, Weller M, Grasso C, Liu L, Becher O, Berlow N, Davis L, Fouladi M, Gajjar A, Hawkins C, Huang E, Hulleman E, Hutt M, Keller C, Li XN, Meltzer P, Quezado M, Quist M, Raabe E, Spellman P, Truffaux N, van Vurden D, Wang N, Warren K, Pal R, Grill J, Monje M, Green AL, Ramkissoon S, McCauley D, Jones K, Perry JA, Ramkissoon L, Maire C, Shacham S, Ligon KL, Kung AL, Zielinska-Chomej K, Grozman V, Tu J, Viktorsson K, Lewensohn R, Gupta S, Mladek A, Bakken K, Carlson B, Boakye-Agyeman F, Kizilbash S, Schroeder M, Reid J, Sarkaria J, Hadaczek P, Ozawa T, Soroceanu L, Yoshida Y, Matlaf L, Singer E, Fiallos E, James CD, Cobbs CS, Hashizume R, Tom M, Ihara Y, Ozawa T, Santos R, Torre JDL, Lepe E, Waldman T, Prados M, James D, Hashizume R, Ihara Y, Huang X, Yu-Jen L, Tom M, Mueller S, Gupta N, Solomon D, Waldman T, Zhang Z, James D, Hayashi T, Adachi K, Nagahisa S, Hasegawa M, Hirose Y, Gephart MH, Moore S, Bergen J, Su YS, Rayburn H, Scott M, Cochran J, Hingtgen S, Kasmieh R, Nesterenko I, Figueiredo JL, Dash R, Sarkar D, Fisher P, Shah K, Horne E, Diaz P, Stella N, Huang C, Yang H, Wei K, Huang T, Hlavaty J, Ostertag D, Espinoza FL, Martin B, Petznek H, Rodriguez-Aguirre M, Ibanez C, Kasahara N, Gunzburg W, Gruber H, Pertschuk D, Jolly D, Robbins J, Hurwitz B, Yoo JY, Bolyard C, Yu JG, Wojton J, Zhang J, Bailey Z, Eaves D, Cripe T, Old M, Kaur B, Serwer L, Yoshida Y, Le Moan N, Santos R, Ng S, Butowski N, Krtolica A, Ozawa T, Cary SPL, James CD, Johns T, Greenall S, Donoghue J, Adams T, Karpel-Massler G, Westhoff MA, Kast RE, Dwucet A, Wirtz CR, Debatin KM, Halatsch ME, Karpel-Massler G, Kast RE, Westhoff MA, Merkur N, Dwucet A, Wirtz CR, Debatin KM, Halatsch ME, Kievit F, Stephen Z, Wang K, Kolstoe D, Silber J, Ellenbogen R, Zhang M, Kitange G, Schroeder M, Sarkaria J, Kleijn A, Haefner E, Leenstra S, Dirven C, Lamfers M, Knubel K, Pernu BM, Sufit A, Pierce AM, Nelson SK, Keating AK, Jensen SS, Kristensen BW, Lachowicz J, Demeule M, Regina A, Tripathy S, Curry JC, Nguyen T, Castaigne JP, Le Moan N, Serwer L, Yoshida Y, Ng S, Davis T, Santos R, Davis A, Tanaka K, Keating T, Getz J, Kapp GT, Romero JM, Ozawa T, James CD, Krtolica A, Cary SPL, Lee S, Ramisetti S, Slagle-Webb B, Sharma A, Connor J, Lee WS, Maire C, Kluk M, Aster JC, Ligon K, Sun S, Lee D, Ho ASW, Pu JKS, Zhang ZQ, Lee NP, Day PJR, Leung GKK, Liu Z, Liu X, Madhankumar AB, Miller P, Webb B, Connor JR, Yang QX, Lobo M, Green S, Schabel M, Gillespie Y, Woltjer R, Pike M, Lu YJ, Torre JDL, Waldman T, Prados M, Ozawa T, James D, Luchman HA, Stechishin O, Nguyen S, Cairncross JG, Weiss S, Lun X, Wells JC, Hao X, Zhang J, Grinshtein N, Kaplan D, Luchman A, Weiss S, Cairncross JG, Senger D, Robbins S, Madhankumar A, Slagle-Webb B, Rizk E, Payne R, Park A, Pang M, Harbaugh K, Connor J, Wilisch-Neumann A, Pachow D, Kirches E, Mawrin C, McDonell S, Liang J, Piao Y, Nguyen N, Yung A, Verhaak R, Sulman E, Stephan C, Lang F, de Groot J, Mizobuchi Y, Okazaki T, Kageji T, Kuwayama K, Kitazato KT, Mure H, Hara K, Morigaki R, Matsuzaki K, Nakajima K, Nagahiro S, Kumala S, Heravi M, Devic S, Muanza T, Nelson SK, Knubel KH, Pernu BM, Pierce AM, Keating AK, Neuwelt A, Nguyen T, Wu YJ, Donson A, Vibhakar R, Venkatamaran S, Amani V, Neuwelt E, Rapkin L, Foreman N, Ibrahim F, New P, Cui K, Zhao H, Chow D, Stephen W, Nozue-Okada K, Nagane M, McDonald KL, Ogawa D, Chiocca E, Godlewski J, Ozawa T, Yoshida Y, Santos R, James D, Pang M, Liu X, Madhankumar AB, Slagle-Webb B, Patel A, Miller P, Connor J, Pasupuleti N, Gorin F, Valenzuela A, Leon L, Carraway K, Ramachandran C, Nair S, Quirrin KW, Khatib Z, Escalon E, Melnick S, Phillips A, Boghaert E, Vaidya K, Ansell P, Shalinsky D, Zhang Y, Voorbach M, Mudd S, Holen K, Humerickhouse R, Reilly E, Huang T, Parab S, Diago O, Espinoza FL, Martin B, Ibanez C, Kasahara N, Gruber H, Pertschuk D, Jolly D, Robbins J, Ryken T, Agarwal S, Al-Keilani M, Alqudah M, Sibenaller Z, Assemolt M, Sai K, Li WY, Li WP, Chen ZP, Saito R, Sonoda Y, Kanamori M, Yamashita Y, Kumabe T, Tominaga T, Sarkar G, Curran G, Jenkins R, Scharnweber R, Kato Y, Lin J, Everson R, Soto H, Kruse C, Kasahara N, Liau L, Prins R, Semenkow S, Chu Q, Eberhart C, Sengupta R, Marassa J, Piwnica-Worms D, Rubin J, Serwer L, Kapp GT, Le Moan N, Yoshida Y, Romero JM, Ng S, Davis A, Ozawa T, Krtolica A, James CD, Cary SPL, Shai R, Pismenyuk T, Moshe I, Fisher T, Freedman S, Simon A, Amariglio N, Rechavi G, Toren A, Yalon M, Shen H, Decollogne S, Dilda P, Chung S, Luk P, Hogg P, McDonald K, Shimazu Y, Kurozumi K, Ichikawa T, Fujii K, Onishi M, Ishida J, Oka T, Watanabe M, Nasu Y, Kumon H, Date I, Sirianni RW, McCall RL, Spoor J, van der Kaaij M, Kloezeman J, Geurtjens M, Dirven C, Lamfers M, Leenstra S, Stephen Z, Veiseh O, Kievit F, Fang C, Leung M, Ellenbogen R, Silber J, Zhang M, Strohbehn G, Atsina KK, Patel T, Piepmeier J, Zhou J, Saltzman WM, Takahashi M, Valdes G, Inagaki A, Kamijima S, Hiraoka K, Micewicz E, McBride WH, Iwamoto KS, Gruber HE, Robbins JM, Jolly DJ, Kasahara N, Warren K, McCully C, Bacher J, Thomas T, Murphy R, Steffen-Smith E, McAllister R, Pastakia D, Widemann B, Wei K, Yang H, Huang C, Chen P, Hua M, Liu H, Woolf EC, Abdelwahab MG, Fenton KE, Liu Q, Turner G, Preul MC, Scheck AC, Yoshida Y, Ozawa T, Butowski N, Shen W, Brown D, Pedersen H, James D, Zhang J, Hariono S, Yao TW, Sidhu A, Hashizume R, James CD, Weiss WA, Nicolaides TP, Olusanya T. EXPERIMENTAL THERAPEUTICS AND PHARMACOLOGY. Neuro Oncol 2013; 15:iii37-iii61. [PMCID: PMC3823891 DOI: 10.1093/neuonc/not176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023] Open
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Hyam JA, Paterson DJ, Aziz TZ, Green AL. Depiction of the neuroscientific principles of human motion 2 millennia ago by Lucretius. Neurology 2011; 77:1000-4. [DOI: 10.1212/wnl.0b013e31822cfa34] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Schmidtmann ET, Herrero MV, Green AL, Dargatz DA, Rodriquez JM, Walton TE. Distribution of Culicoides sonorensis (Diptera: Ceratopogonidae) in Nebraska, South Dakota, and North Dakota: clarifying the epidemiology of bluetongue disease in the northern Great Plains region of the United States. J Med Entomol 2011; 48:634-643. [PMID: 21661325 DOI: 10.1603/me10231] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The presence or absence of the biting midge Culicoides sonorensis Wirth & Jones (Diptera: Ceratopogonidae), a primary vector of bluetongue viruses (genus Orbivirus, family Reoviridae, BTV) in North America, was assessed on ranches and farms across the Northern Great Plains region of the United States, specifically Nebraska, South Dakota, and North Dakota, as part of a 2-yr regional study of BTV exposure among cattle. Blacklight/suction trap samples totaling 280 2-night intervals were taken at 140 aquatic sites (potential larval habitat for C. sonorensis) on 82 livestock operations (ranches and farms) that span a south-to-north gradient of expected decreasing risk for exposure to BTV. In Nebraska, C. sonorensis populations were common and widespread, present at 15 of 18 operations. Of 32 operations sampled in South Dakota, seven of which were sampled in successive years, 18 were positive for C. sonorensis; 13 of 14 operations located west of the Missouri River were positive, whereas 13 of 18 operations east of the river were negative. Of 32 operations sampled in North Dakota, seven of which were sampled both years, 12 were positive for C. sonorensis. Six of eight operations located west and south of the Missouri River in North Dakota were positive, whereas 18 of 24 operations east and north of the river were negative for C. sonorensis. These data illustrate a well-defined pattern of C. sonorensis spatial distribution, with populations consistently present across Nebraska, western South Dakota, and western North Dakota; western South Dakota, and North Dakota encompass the Northwestern Plains Ecoregion where soils are nonglaciated and evaporation exceeds precipitation. In contrast, C. sonorensis populations were largely absent east of the Missouri River in South Dakota and North Dakota; this area comprises the Northwestern Glaciated Plains Ecoregion and Northern Glaciated Plains Ecoregion where surface soils reflect Wisconsinan glaciation and precipitation exceeds evaporation. In defining a well-demarcated pattern of population presence or absence on a regional scale, the data suggest that biogeographic factors regulate the distribution of C. sonorensis and in turn BTV exposure. These factors, ostensibly climate and soil type as they affect the suitability of larval habitat, may explain the absence of C. sonorensis, hence limited risk for exposure to BTV, across the eastern Northern Plains, upper Midwest, and possibly Northeast, regions of the United States.
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Affiliation(s)
- E T Schmidtmann
- Arthropod-Borne Animal Diseases Research Unit, 1515 College Ave., Manhattan, KS, 66502, USA.
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Pereira EAC, Qadri SRM, Cadoux-Hudson TAD, Green AL. Acute foramen magnum syndrome from acquired Chiari I malformation relieved by ventriculoperitoneal shunt revision. Br J Neurosurg 2010; 24:695-6. [PMID: 21070154 DOI: 10.3109/02688697.2010.495174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
An adult case of shunt malfunction presenting with acute quadriparesis as a manifestation of foramen magnum syndrome with acquired Chiari type I malformation is described in this study. The corticospinal function was restored after shunt revision. MRI showing considerable ascent of cerebellar tonsils after surgery is shown. Theories regarding the formation of acquired Chiari I malformations, alongside the possible synergistic roles of intracranial pathologies and cerebrospinal fluid drainage in the development of this entity are discussed.
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Affiliation(s)
- E A C Pereira
- Nuffield Department of Surgery, University of Oxford and Department of Neurological Surgery, The John Radcliffe Hospital, Oxford, UK.
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17
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Abstract
Chronic abdominal pain is not uncommon and can be difficult to manage. We present the case of a 17-year-old man with a 4-year history of chronic abdominal pain. The patient had previously undergone abdominal surgery by way of laparoscopic appendicectomy and right nephrectomy for a mal-rotated kidney. The patient continued to suffer right-sided abdominal pain which was not controlled by analgesia. We report the successful implantation of a right D11 intercostal nerve stimulator to control the patient's pain. This is the first report of an implantable intercostal nerve stimulator to control intractable chronic abdominal pain.
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Affiliation(s)
- R D Johnson
- Nuffield Department of Surgery, University of Oxford and Oxford Functional Neurosurgery, John Radcliffe Hospital, Oxford, UK.
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18
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Johnson RD, Qadri SR, Joint C, Moir L, Green AL, Aziz TZ. Perioperative seizures following deep brain stimulation in patients with multiple sclerosis. Br J Neurosurg 2010; 24:289-90. [DOI: 10.3109/02688690903577631] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Brittain JS, Green AL, Jenkinson N, Ray NJ, Holland P, Stein JF, Aziz TZ, Davies P. Local Field Potentials Reveal a Distinctive Neural Signature of Cluster Headache in the Hypothalamus. Cephalalgia 2009; 29:1165-73. [DOI: 10.1111/j.1468-2982.2009.01846.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cluster headache (CH) is a debilitating neurovascular condition characterized by severe unilateral periorbital head pain. Deep brain stimulation of the posterior hypothalamus has shown potential in alleviating CH in its most severe, chronic form. During surgical implantation of stimulating macroelectrodes for cluster head pain, one of our patients suffered a CH attack. During the attack local field potentials displayed a significant increase in power of approximately 20 Hz. To the authors' knowledge, this is the first recorded account of neuronal activity observed during a cluster attack. Our results both support and extend the current literature, which has long implicated hypothalamic activation as key to CH generation, predominantly through indirect haemodynamic neuroimaging techniques. Our findings reveal a potential locus in CH neurogenesis and a potential rationale for efficacious stimulator titration.
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Affiliation(s)
- J-S Brittain
- Department of Physiology, Anatomy & Genetics, University of Oxford
| | - AL Green
- Nuffield Department of Surgery, John Radcliffe Hospital, Oxford, UK
| | - N Jenkinson
- Nuffield Department of Surgery, John Radcliffe Hospital, Oxford, UK
| | - NJ Ray
- Department of Physiology, Anatomy & Genetics, University of Oxford
| | - P Holland
- Nuffield Department of Surgery, John Radcliffe Hospital, Oxford, UK
| | - JF Stein
- Department of Physiology, Anatomy & Genetics, University of Oxford
| | - TZ Aziz
- Department of Physiology, Anatomy & Genetics, University of Oxford
- Nuffield Department of Surgery, John Radcliffe Hospital, Oxford, UK
| | - P Davies
- Nuffield Department of Surgery, John Radcliffe Hospital, Oxford, UK
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20
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Abstract
Phenytoin is often used to prevent postcraniotomy seizures, but is not always effective. We investigate changes in plasma phenytoin level ([phenytoin]) following craniotomy. The [phenytoin] in 28 patients who were receiving phenytoin (oral/ intravenous) and undergoing a craniotomy were prospectively measured 24 h preoperatively, immediately pre- and postcraniotomy, 24 and 48 h postoperatively. Factors examined included patients' age, sex, pathology, preoperative [phenytoin], operative duration and blood loss. Fifteen patients had [phenytoin] concentrations outside the therapeutic range. Twenty-five patients experienced a decrease in [phenytoin] immediately postcraniotomy: pre-, post- and 24 h postcraniotomy mean [phenytoin] were 13.4, 10.0 and 12.9 mg/l, respectively. Preoperative [phenytoin], operative duration and blood loss had significant correlation with the decrease in [phenytoin] (p < 0.05). In conclusion, < 50% of the patients had therapeutic preoperative [phenytoin]. In most patients, [phenytoin] decreases by 26% after craniotomy and returns to preoperative level within 24 h. These may contribute to early postoperative seizure development.
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Affiliation(s)
- J S Yeh
- Department of Neurosurgery, University Hospital of North Staffordshire, Stoke-on-Trent, UK
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21
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Affiliation(s)
- E A C Pereira
- Department of Neurological Surgery, The West Wing, The John Radcliffe Hospital, Oxford, UK
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22
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Affiliation(s)
- A L Green
- Department of Physiology, Anatomy & Genetics, University of Oxford, UK.
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Pereira EAC, Jegan T, Green AL, Aziz TZ. Awake stereotactic brainstem biopsy via a contralateral, transfrontal, transventricular approach. Br J Neurosurg 2008; 22:599-601. [PMID: 18686061 DOI: 10.1080/02688690802220387] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The authors describe a novel approach to stereotactic biopsy of lesions of the lateral pons and medial cerebellar peduncle, and its diagnostic success without morbidity. A contralateral approach laterally expands the accessible infratentorial area. It may also confer a theoretical reduction in neurological deficit with passage through non-dominant right hemisphere.
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Affiliation(s)
- E A C Pereira
- Oxford Functional Neurosurgery, Department of Neurological Surgery, John Radcliffe Hospital, Oxford, UK.
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Green AL, Lombard JE, Garber LP, Wagner BA, Hill GW. Factors associated with occurrence and recovery of nonambulatory dairy cows in the United States. J Dairy Sci 2008; 91:2275-83. [PMID: 18487650 DOI: 10.3168/jds.2007-0869] [Citation(s) in RCA: 28] [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: 11/19/2022]
Abstract
The primary objective of this study was to compare characteristics of US dairy operations that had one or more nonambulatory cows (unable to rise for any period of time) (cases) with operations that had no nonambulatory cows (controls) during 2004. A secondary objective was to describe factors associated with recovery of the last nonambulatory cow on the operation during 2004. Case dairy operations (n = 1,822) more often fed a total mixed ration [odds ratio (OR) = 2.0; confidence interval (CI): 1.1-3.4], produced more than 9,090 kg of milk (OR = 2.8; CI: 1.8-4.5), and were more likely to be of medium to large herd size (100 or more head of adult cows, OR = 3.7; CI: 2.2-6.2) compared with control dairies (n = 151). Compared with operations where the predominant flooring surface on which lactating cows stood or walked in winter was pasture, operations where pasture was not the predominant surface were at increased risk of having nonambulatory cows (OR = 4.7; CI: 2.2-10.2). Cows nonambulatory for less than 24 h were more likely to recover compared with cows nonambulatory for 24 h or more (OR = 3.0; CI: 2.0-4.4). Cows that received calcium, phosphorus, or potassium while non-ambulatory were more likely to recover (OR = 3.6; CI: 2.1-6.1) than cattle that did not receive these treatments. Cattle that were not repositioned periodically were more likely to recover (OR = 2.1; CI: 1.4-3.1), as were cattle that were not treated by a veterinarian before becoming nonambulatory (OR = 1.9; CI: 1.1-3.3). These findings are consistent with prolonged recumbency and prior history of health issues, respectively. Nonambulatory cattle with hypocalcemia were more likely to recover (OR = 6.0; CI: 3.4-10.7) compared with nonambulatory cows with all other causes of a nonambulatory condition (analyzed collectively as a single variable but including cancer, clinical mastitis, digestive conditions, metabolic imbalances, neurological problems, respiratory disease, other, unknown). The results of this study reveal that the majority of US dairy operations have at least one nonambulatory dairy cow over the course of a year. Additionally, individual animal factors associated with being nonambulatory may lead to improved identification and treatment of animals that are nonambulatory for a prolonged period. From the perspective of recovery, considering euthanasia is appropriate for cows that have been nonambulatory for more than 24 h.
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Affiliation(s)
- A L Green
- USDA:APHIS:VS, Centers for Epidemiology and Animal Health, 2150 Centre Ave., Bldg. B, Fort Collins, CO 80526-8117, USA.
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Owen SLF, Heath J, Kringelbach M, Green AL, Pereira EAC, Jenkinson N, Jegan T, Stein JF, Aziz TZ. Pre-operative DTI and probabilisitic tractography in four patients with deep brain stimulation for chronic pain. J Clin Neurosci 2008; 15:801-5. [PMID: 18495481 DOI: 10.1016/j.jocn.2007.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Accepted: 06/11/2007] [Indexed: 10/22/2022]
Abstract
This study aimed to examine, using diffusion tensor imaging (DTI), differences in electrode placement in four patients undergoing deep brain stimulation for chronic neuropathic pain of varying aetiology. A pre-operative DTI was obtained for each patient, who was then implanted with deep brain stimulation electrodes in the periventricular/periaqueductal grey area with good pain relief. Using seeds from the postoperative MRI scan, probabilistic tractography was performed from the pre-operative DTI.
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Affiliation(s)
- S L F Owen
- Oxford Functional Neurosurgery, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
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Abstract
Deep brain stimulation (DBS) for pain was one of the earliest indications for the therapy. This study reports the outcome of DBS of the sensory thalamus and the periventricular and peri-aqueductal grey area (PVG/PAG) complex for different intractable neuropathic pain syndromes. Forty-seven patients (30 males and 17 females) were selected for surgery; they were suffering from any of the following types of pain: post-stroke neuropathic pain, phantom limb pain, post-herpetic neuralgia, anaesthesia dolorosa, brachial plexus injury and neuropathic pain secondary to neural damage from a variety of causes. Of the 47 patients selected for trial stimulation, 38 patients proceeded to permanent implantation. Patients suffering from post-stroke pain were the most likely to fail trial stimulation (33%), in contrast to individuals with phantom limb/post-brachial plexus injury pain and anaesthesia dolorosa, all of whom underwent permanent implantation. PVG stimulation alone was optimal in 17 patients (53%), whilst a combination of PVG and thalamic stimulation produced the greatest degree of analgesia in 11 patients (34%). Thalamic stimulation alone was optimal in 4 patients (13%). DBS of the PVG alone was associated with the highest degree of pain alleviation, with a mean improvement of 59% (p <0.001) and a > or =50% improvement in 66% of patients. Post-stroke pain responds in 70% of patients. We conclude that the outcomes of surgery appear to vary according to aetiology, but it would appear that the effects are best for phantom limb syndromes, head pain and anaesthesia dolorosa.
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Affiliation(s)
- S L F Owen
- University Laboratory of Physiology, University of Oxford, Oxford, UK
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Abstract
It has been postulated that mammalian nuclear transfer (NT) cloning efficiency is inversely correlated with donor cell differentiation status. To test this hypothesis, we compared genetically identical and increasingly differentiated donors within the myogenic lineage. Bovine male fetal muscle cells were cultured for 1-6 days in vitro. The proportion of cells displaying the following antigens was quantified by immunofluorescence microscopy: MYOD1, MYF5, PAX7, MYOG, DES, MYH, and 5-Bromo-2-deoxyuridine. Based on the antigen profile of both bulk populations and individually size-selected cells prepared for NT, donors serum-starved for 1, 4, and 5 days were classified as myogenic precursors (MPCs), myotubes (MTs), and muscle-derived fibroblasts (MFs) with purities of 92%, 85%, and 99%, respectively. Expression of the following transcripts was measured by RT-PCR in 1) cells selected for NT, 2) metaphase II oocytes, 3) NT couplets, 4) NT reconstructs, 5) NT two-cell embryos, and 6) NT blastocysts: MYOD1, MYF5, PAX7, MYOG, MYF6, ACTB, and 18S rRNA. Muscle-specific genes were silenced and remained undetectable up to the blastocyst stage, whereas housekeeping genes 18S and ACTB continued to be expressed. Differentiation status affected development to transferable embryos (118 [23%] of 520 vs. 93 [11%] of 873 vs. 66 [38%] of 174 for MPC vs. MT vs. MF, respectively, P < 0.001). However, there were no significant differences in pregnancy rate and development to weaning between the cell types (pregnancy rate: 14 [64%] of 22 vs. 8 [35%] of 23 vs. 10 [45%] of 22, and development: 4 [18%] of 22 vs. 2 [9%] of 23 vs. 3 [14%] of 22 for MPC vs. MT vs. MF, respectively).
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Affiliation(s)
- A L Green
- Ruakura Research Centre, Reproductive Technologies, AgResearch Ltd., Hamilton, New Zealand
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28
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Owen SLF, Green AL, Davies P, Stein JF, Aziz TZ, Behrens T, Voets NL, Johansen-Berg H. Connectivity of an effective hypothalamic surgical target for cluster headache. J Clin Neurosci 2007; 14:955-60. [PMID: 17689083 DOI: 10.1016/j.jocn.2006.07.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2006] [Revised: 07/06/2006] [Accepted: 07/14/2006] [Indexed: 11/19/2022]
Abstract
The purpose of this study was to look at the connectivity of the posterior inferior hypothalamus in a patient implanted with a deep brain stimulating electrode using probabilistic tractography in conjunction with postoperative MRI scans. In a patient with chronic cluster headache we implanted a deep brain stimulating electrode into the ipsilateral postero-medial hypothalamus to successfully control his pain. To explore the connectivity, we used the surgical target from the postoperative MRI scan as a seed for probabilistic tractography, which was then linked to diffusion weighted imaging data acquired in a group of healthy control subjects. We found highly consistent connections with the reticular nucleus and cerebellum. In some subjects, connections were also seen with the parietal cortices, and the inferior medial frontal gyrus. Our results illustrate important anatomical connections that may explain the functional changes associated with cluster headaches and elucidate possible mechanisms responsible for triggering attacks.
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Affiliation(s)
- S L F Owen
- University Laboratory of Physiology, University of Oxford, Oxford, UK
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Green AL, Wang S, Bittar RG, Owen SLF, Paterson DJ, Stein JF, Bain PG, Shlugman D, Aziz TZ. Deep brain stimulation: a new treatment for hypertension? J Clin Neurosci 2007; 14:592-5. [PMID: 17430783 DOI: 10.1016/j.jocn.2006.04.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2006] [Revised: 04/18/2006] [Accepted: 04/22/2006] [Indexed: 11/20/2022]
Abstract
We report a 61-year-old hypertensive man who underwent deep brain stimulation of the periventricular/periaqueductal grey area for the relief of chronic neuropathic pain affecting his oral cavity and soft palate. During intraoperative stimulation, we were able to modulate his blood pressure up or down, depending on electrode location. This is the first evidence that hypertension could be effectively treated with electrical stimulation of the midbrain.
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Affiliation(s)
- A L Green
- Department of Neurosurgery, Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, UK.
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Abstract
In this chapter, we report that blood pressure can be increased or decreased depending on whether an electrode is in ventral or dorsal PAG. We also describe that it is theoretically possible to treat orthostatic hypotension. These are exciting developments not only because they provide an example of direct translational research from animal research to humans but also because they highlight a potential for future clinical therapies. The control of essential hypertension without drugs is attractive because of the side effects of medication such as precipitation of heart failure [10]. Similarly, drug treatment of orthostatic hypotension cannot differentiate between the supine and standing positions and can therefore lead to nocturnal hypertension [22, 29]. A stimulator could be turned off at night or contain a mercury switch that reacts to posture.
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Affiliation(s)
- A L Green
- Department of Neurosurgery, Radcliffe Infirmary, Woodstock Road, Oxford, UK
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Hanna SJ, Green AL, Ansorge O, Anslow P, Richards PG. Immature teratoma arising from a benign cortical abnormality. Childs Nerv Syst 2006; 22:164-7. [PMID: 15682320 DOI: 10.1007/s00381-004-1093-1] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Indexed: 11/25/2022]
Abstract
CASE REPORT The authors report the case of an immature teratoma of the left parieto-occipital region in a 13-year-old girl. The patient had a computed tomographic (CT) scan of the brain aged 10 months old, following a minor head injury. This demonstrated an abnormality in the same region, which had been reported as 'a cortical malformation'. DIAGNOSIS We propose that the lesion on the original imaging is a mature teratoma or other silent dystopic germ cell element that subsequently transformed into the immature teratoma. DISCUSSION The potential triggers for such a transformation and the management of patients with similar incidental radiological findings are discussed.
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Affiliation(s)
- S J Hanna
- Department of Neurological Surgery (Paediatric Division), Radcliffe Infirmary, Oxford, UK.
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Green AL, Joint C, Sethi H, Bain P, Aziz TZ. Cost analysis of unilateral and bilateral pallidotomy for Parkinson's disease. J Clin Neurosci 2004; 11:829-34. [PMID: 15519857 DOI: 10.1016/j.jocn.2004.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2003] [Accepted: 03/10/2004] [Indexed: 10/26/2022]
Abstract
With the rapid increase in provision of deep brain stimulation for Parkinson's disease, the efficacy of pallidotomy in symptom alleviation appears to be increasingly ignored. We demonstrate that lesional surgery is effective with benefit over a significant period of time with very significant societal cost savings. Such studies are essential for future planning of services so that maximum numbers of patients can benefit from surgery, both lesional and neuromodulation, as deemed appropriate.
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Affiliation(s)
- A L Green
- The Oxford Movement Disorder Group, Department of Neurological Surgery, The Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, UK
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Abstract
BACKGROUND The production of clinical guidelines is increasing and will continue to do so with the introduction of clinical governance. In 1997, the British Orthopaedic Association (BOA) and the British Association of Plastic Surgeons (BAPS) published joint guidelines on the management of open tibial fractures. It is not known whether these guidelines reached their target audience, or indeed influenced clinical practice. METHODS We determined the effectiveness of these guidelines by sending a postal questionnaire survey to 172 orthopaedic surgeons. RESULTS Only 57% of consultants were aware of the guidelines, 70% of registrars and 25% of staff grades. Less than 29% of orthopaedic consultants would choose to consult the plastic surgical team pre-operatively in the management of an open tibial fracture and only 43% would seek plastic surgical involvement at all. The primary aim of increasing multidisciplinary communication has not been achieved. CONCLUSIONS The awareness of, and adherence to, these guidelines is sub-optimal. This clearly has implications for both the future management of open tibial fractures and the further production of guidelines.
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Affiliation(s)
- A D Toms
- North Staffordshire Royal Infirmary, Stoke on Trent, UK
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Abstract
Post-herpetic neuralgic affects up to 20% of patients after an attack of trigeminal Herpes Zoster infection. Past medical and surgical treatments have been unrewarding. We report the successful treatment of such a case with deep brain stimulation into the region of the contralateral periventricular grey area (PVG) and ventral posterior lateral thalamic nucleus (VPL).
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Affiliation(s)
- A L Green
- Department of Neurosurgery, Radcliffe Infirmary, Oxford, UK
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Affiliation(s)
- A L Green
- Department of Neurosurgery, North Staffordshire Royal Infirmary, Stoke-on-Trent, UK
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Abstract
Previous work on the lactose permease of Escherichia coli has shown that mutations along a face of predicted transmembrane segment 2 (TMS-2) play a critical role in conformational changes associated with lactose transport [Green, A. L., Anderson, E. J., and Brooker, R. J. (2000) J. Biol. Chem. 275, 23240-23246]. In the current study, mutagenesis was conducted along the side of predicted TMS-8 that contains the first amino acid in the conserved loop 8/9 motif. Several substitutions at positions 261, 265, 272, and 276 were markedly defective for downhill lactose transport although these mutants were well expressed. Substitutions along the entire side of TMS-8 containing the first amino acid in the loop 8/9 motif displayed defects in uphill lactose transport. Again, substitutions at positions 261, 265, 268, 272, and 276 were the most defective, with several of these mutants showing no lactose accumulation against a gradient. According to helical wheel plots, Phe-261, Thr-265, Gly-268, Asn-272, and Met-276 form a continuous stripe along one face of TMS-8. These results are discussed according to our hypothetical model, in which the two halves of the protein form a rotationally symmetrical dimer. In support of this model, alignment of predicted TMS-2 and TMS-8 shows an agreement between the amino acid residues in these transmembrane segments that are critical for lactose transport activities.
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Affiliation(s)
- A L Green
- Department of Genetics, Cell Biology, and Development and the Bioprocess Technology Institute, University of Minnesota, St. Paul, Minnesota 55108, USA
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He Y, Tang W, Swain JD, Green AL, Jack TP, Gan S. Networking senescence-regulating pathways by using Arabidopsis enhancer trap lines. Plant Physiol 2001; 126:707-16. [PMID: 11402199 PMCID: PMC111161 DOI: 10.1104/pp.126.2.707] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2001] [Revised: 03/26/2001] [Accepted: 04/03/2001] [Indexed: 05/18/2023]
Abstract
The last phase of leaf development, generally referred to as leaf senescence, is an integral part of plant development that involves massive programmed cell death. Due to a sharp decline of photosynthetic capacity in a leaf, senescence limits crop yield and forest plant biomass production. However, the biochemical components and regulatory mechanisms underlying leaf senescence are poorly characterized. Although several approaches such as differential cDNA screening, differential display, and cDNA subtraction have been employed to isolate senescence-associated genes (SAGs), only a limited number of SAGs have been identified, and information regarding the regulation of these genes is fragmentary. Here we report on the utilization of enhancer trap approach toward the identification and analysis of SAGs. We have developed a sensitive large-scale screening method and have screened 1,300 Arabidopsis enhancer trap lines and have identified 147 lines in which the reporter gene GUS (beta-glucuronidase) is expressed in senescing leaves but not in non-senescing ones. We have systematically analyzed the regulation of beta-glucuronidase expression in 125 lines (genetically, each contains single T-DNA insertion) by six senescence-promoting factors, namely abscisic acid, ethylene, jasmonic acid, brassinosteroid, darkness, and dehydration. This analysis not only reveals the complexity of the regulatory circuitry but also allows us to postulate the existence of a network of senescence-promoting pathways. We have also cloned three SAGs from randomly selected enhancer trap lines, demonstrating that reporter expression pattern reflects the expression pattern of the endogenous gene.
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Affiliation(s)
- Y He
- Plant Physiology/Biochemistry/Molecular Biology Program, Department of Agronomy and Tobacco and Health Research Institute, University of Kentucky, Lexington, Kentucky 40546-0236, USA
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Green AL, Anderson EJ, Brooker RJ. A revised model for the structure and function of the lactose permease. Evidence that a face on transmembrane segment 2 is important for conformational changes. J Biol Chem 2000; 275:23240-6. [PMID: 10807929 DOI: 10.1074/jbc.m909202199] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 11/06/2022] Open
Abstract
The lactose permease is an integral membrane protein that cotransports H(+) and lactose into the bacterial cytoplasm. Previous work has shown that bulky substitutions at glycine 64, which is found on the cytoplasmic edge of transmembrane segment 2 (TMS-2), cause a substantial decrease in the maximal velocity of lactose uptake without significantly affecting the K(m) values (Jessen-Marshall, A. E., Parker, N. J., and Brooker, R. J. (1997) J. Bacteriol. 179, 2616-2622). In the current study, mutagenesis was conducted along the face of TMS-2 that contains glycine-64. Single amino acid substitutions that substantially changed side-chain volume at codons 52, 57, 59, 63, and 66 had little or no effect on transport activity, whereas substitutions at codons 49, 53, 56, and 60 were markedly defective and/or had lower levels of expression. According to helical wheel plots, Phe-49, Ser-53, Ser-56, Gln-60, and Gly-64 form a continuous stripe along one face of TMS-2. Several of the TMS-2 mutants (S56Y, S56L, S56Q, Q60A, and Q60V) were used as parental strains to isolate mutants that restore transport activity. These mutations were either first-site mutations or second-site suppressors in TMS-1, TMS-2, TMS-7 or TMS-11. A kinetic analysis showed that the suppressors had a higher rate of lactose transport compared with the corresponding parental strains. Overall, the results of this study are consistent with the notion that a face on TMS-2, containing Phe-49, Ser-53, Ser-56, Gln-60, and Gly-64, plays a critical role in conformational changes associated with lactose transport. We hypothesize that TMS-2 slides across TMS-7 and TMS-11 when the lactose permease interconverts between the C1 and C2 conformations. This idea is discussed within the context of a revised model for the structure of the lactose permease.
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Affiliation(s)
- A L Green
- Department of Genetics, Cell Biology, and Development and the BioProcess Technology Institute, University of Minnesota, St. Paul, Minnesota 55108, USA
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Abstract
Imaging studies in Neurobehçet's disease have to date focused on the brain, with only four previous case reports of documented spinal cord involvement on MRI being published. A fifth case is documented here, together with a review of the literature.
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Affiliation(s)
- A L Green
- Department of Radiology, Royal Melbourne Hospital, Victoria, Australia.
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Green AL, DuTeau NM, Miller MW, Triantis JM, Salman MD. Polymerase chain reaction techniques for differentiating cytotoxic and noncytotoxic Pasteurella trehalosi from Rocky Mountain bighorn sheep. Am J Vet Res 1999; 60:583-8. [PMID: 10328428] [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: 02/12/2023]
Abstract
OBJECTIVE To evaluate 2 polymerase chain reaction (PCR)-based methods for differentiating cytotoxic and noncytotoxic Pasteurella trehalosi from Rocky Mountain bighorn sheep (Ovis canadensis canadensis). SAMPLE POPULATION 23 isolates of P. trehalosi from bighorn sheep in Colorado, including 18 from free-ranging herds and 5 from a captive herd. PROCEDURE Using a sequence of the leukotoxin gene region of P. haemolytica serotype 1, 7 PCR primers were designed. A PCR amplification was performed on a sample of bacterial cell suspensions from pure cultures of P. trehalosi with known in vitro cytotoxic effects. The 2 most promising primer pairs were used in a study of 23 P. trehalosi isolates. Results were analyzed for association with cytotoxicity and 3 distinct ribotypes (Eco, Aco, and Bco). RESULTS Significant associations were observed between in vitro cytotoxicity and PCR results for coding region, between ribotype Eco classification and PCR results for coding region, and between ribotype Eco classification and PCR results for promoter region. There was a negative association between ribotype Aco classification and PCR results for coding and promoter regions. CONCLUSIONS AND CLINICAL RELEVANCE The PCR for the leukotoxin A coding region may be useful in differentiating cytotoxic from noncytotoxic P. trehalosi isolates recovered from bighorn sheep. It may be useful for studying epidemiologic features of pasteurellosis in bighorn sheep and for designing vaccines to protect wild sheep against pneumonia caused by P. trehalosi and P. haemolytica.
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Affiliation(s)
- A L Green
- Department of Environmental Health, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523-1676, USA
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Green AL, Hultman E, Macdonald IA, Sewell DA, Greenhaff PL. Carbohydrate ingestion augments skeletal muscle creatine accumulation during creatine supplementation in humans. Am J Physiol 1996; 271:E821-6. [PMID: 8944667 DOI: 10.1152/ajpendo.1996.271.5.e821] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This study investigated the effect of carbohydrate (CHO) ingestion on skeletal muscle creatine (Cr) accumulation during Cr supplementation in humans. Muscle biopsy, urine, and plasma samples were obtained from 24 males before and after ingesting 5 g Cr in solution (group A) or 5 g Cr followed, 30 min later, by 93 g simple CHO in solution (group B) four times each day for 5 days. Supplementation resulted in an increase in muscle phosphocreatine (PCr), Cr, and total creatine (TCr; sum of PCr and Cr) concentration in groups A and B, but the increase in TCr in group B was 60% greater than in group A (P < 0.01). There was also a corresponding decrease in urinary Cr excretion in group B (P < 0.001). Creatine supplementation had no effect on serum insulin concentration, but Cr and CHO ingestion dramatically elevated insulin concentration (P < 0.001). These findings demonstrate that CHO ingestion substantially augments muscle Cr accumulation during Cr feeding in humans, which appears to be insulin mediated.
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Affiliation(s)
- A L Green
- Department of Physiology and Pharmacology, University Medical School, Queen's Medical Center, Nottingham, United Kingdom
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Green AL, Simpson EJ, Littlewood JJ, Macdonald IA, Greenhaff PL. Carbohydrate ingestion augments creatine retention during creatine feeding in humans. Acta Physiol Scand 1996; 158:195-202. [PMID: 8899067 DOI: 10.1046/j.1365-201x.1996.528300000.x] [Citation(s) in RCA: 121] [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] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Blood and urine samples were obtained from four groups of healthy male subjects (A-D, total n = 22) before, during and after ingesting the following: group A, 5 g of creatine in solution; groups B and C, 5 g of creatine and 93 g of simple carbohydrate in solution: group D, a creatine- and carbohydrate-free solution. Subjects ingested the above preparations every 4 h for the remainder of the day and throughout the next day (total daily creatine dose = 20 g), and reported back to the laboratory on day 3 to undergo the same procedures as on day 1. Throughout this time, subjects weighed and recorded all dietary intake, and those in groups B and C ingested a prescribed isoenergetic high carbohydrate diet. Subjects in group C also performed 1 h of cycling exercise at 70% of their maximal oxygen consumption on the morning of each day. On both days 1 and 3, peak plasma creatine concentration, the area under the plasma creatine concentration/time curve and urinary creatine concentration were lower in groups B and C than in group A. Conversely, serum insulin concentration was higher in groups B and C than in A. No differences were evident when comparing groups B and C. These data suggest carbohydrate ingestion augmented creatine retention during creatine feeding and that creatine retention was not further increased when exercise was performed prior to ingestion.
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Affiliation(s)
- A L Green
- Department of Physiology and Pharmacology, University Medical School, Queen's Medical Centre, Nottingham, UK
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Stroud MA, Holliman D, Bell D, Green AL, Macdonald IA, Greenhaff PL. Effect of oral creatine supplementation on respiratory gas exchange and blood lactate accumulation during steady-state incremental treadmill exercise and recovery in man. Clin Sci (Lond) 1994; 87:707-10. [PMID: 7874863 DOI: 10.1042/cs0870707] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.9] [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: 01/27/2023]
Abstract
1. Oral creatine supplementation has been shown to increase muscle creatine and phosphocreatine concentrations with consequent benefits on performance during short-term maximal exercise. However, recently there have been anecdotal reports that creatine supplementation can also influence the pattern of substrate utilization and improve performance during more prolonged, submaximal exercise, which, based on recent experimental evidence, may have some scientific justification. 2. Eight men performed a continuous incremental exercise test running at 10 km/h on a motorized treadmill at predetermined workloads from 50% to 90% of maximal oxygen uptake, before and after 5 days of creatine supplementation (4 x 5 g daily). Exercise was performed for 6 min at each workload to achieve a steady state, and respiratory gas exchange and blood lactate concentrations were measured during the last 30 s at each workload. Measurements were also made at 5-min intervals for the first 15 min of recovery. 3. The results showed no measurable effect of creatine supplementation on respiratory gas exchange and blood lactate concentrations during either incremental submaximal exercise or recovery. This suggests that creatine supplementation does not influence substrate utilization during and after this type of exercise.
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Affiliation(s)
- M A Stroud
- Centre for Human Sciences, Defence Research Agency, Farnborough, Hants, U.K
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Chi L, Friedrichs GS, Oh JY, Green AL, Lucchesi BR. Effect of Ado A1- and A2-receptor activation on ventricular fibrillation during hypoxia-reoxygenation. Am J Physiol 1994; 267:H1447-54. [PMID: 7943390 DOI: 10.1152/ajpheart.1994.267.4.h1447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We examined the hypothesis that adenosine (Ado)-induced alterations in ventricular electrophysiology may contribute to arrhythmogenesis in a setting of myocardial hypoxia through activation of Ado A1 and A2 receptors in the rabbit isolated perfused heart. There was a 20% incidence of ventricular fibrillation (VF) in control hearts subjected to perfusion conditions of hypoxia and reoxygenation. The incidence of VF was increased to 50% in the presence of 1 microM Ado when hearts were exposed to hypoxia-reoxygenation. The incidence of VF was 20% when Ado was increased to 10 microM. Inhibition of the Ado A2 receptor with 3,7-dimethyl-l-propargylxanthine (DMPX; 10 microM) increased the incidence of VF to 100% when 10 microM Ado was added to the perfusion medium. The A1 antagonist, 8-cyclopentyl-1,3-dipropylxanthine (DPCPX, 1 microM), attenuated (from 100% to 20%) VF induced by Ado + DMPX (10 microM each). The ventricular refractory period and monophasic action potential duration were determined in a separate group of hearts. Our findings indicate that 1) Ado A1-receptor stimulation facilitates VF by decreasing action potential duration and refractoriness in hearts subjected to hypoxia and reoxygenation and 2) the arrhythmogenic potential of Ado A1-receptor stimulation is modulated by simultaneous activation of the ventricular A2 Ado receptor.
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Affiliation(s)
- L Chi
- Department of Pharmacology, University of Michigan Medical School, Ann Arbor 48109-0626
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Abstract
1. This study was designed to determine whether clofilium exhibits antifibrillatory activity in a pinacidil + hypoxia-induced model of ventricular fibrillation (VF) in Langendorff-perfused hearts. 2. Ten minutes after exposure to vehicle or clofilium (0.1, 1.0 and 10.0 microM), hearts were exposed to pinacidil (1.25 microM), then subjected to 12 min of hypoxia and reoxygenated. Onset to VF was recorded. Additional groups of hearts were pretreated with UK-68,798 (1.0, 3.0 and 10.0 microM), a delayed rectifier channel blocker, and 5-hydroxydecanoate (10 microM), a known ATP-dependent K+ channel blocker, and subjected to an identical protocol. 3. Clofilium decreased the incidence of VF in a concentration-dependent manner; 7/9 control hearts developed VF vs 1/9 hearts (P = 0.007, Fisher's Exact) treated with 10.0 microM clofilium. In addition, 5-hydroxydecanoate protected hearts from VF, while UK-68,798 pretreatment did not. 4. In a separate group of hearts, electrically-induced VF was converted to sinus rhythm in 10/11 hearts after clofilium was introduced as a bolus. 5. Clofilium is capable of preventing VF in the rabbit isolated heart in a concentration-dependent manner. We have data to suggest that the ability of clofilium to attenuate the effects of pinacidil+hypoxia in our model may include blockade of metabolically active K+ channels, i.e., KATP (glibenclamide-sensitive) channel.
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Affiliation(s)
- G S Friedrichs
- University of Michigan Medical School, Department of Pharmacology, Ann Arbor 48109-0626
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Abstract
Four tricyclic antidepressants, amitriptyline, imipramine, desipramine and iprindole have been shown to partially protect mouse brain monoamine oxidase in-vivo from the irreversible enzyme inhibition produced by subsequent injection of phenelzine. Levels of protection were similar when the enzyme was assayed with selective substrates (5-hydroxytryptamine and phenethylamine) for both the A and B forms of the enzyme. Although other explanations cannot at this stage be ruled out, these observations are consistent with the tricyclic antidepressants acting as reversible inhibitors of brain monoamine oxidase in-vivo.
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Affiliation(s)
- A L Green
- Department of Bioscience and Biotechnology, University of Strothclyde, Glasgow, UK
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Green AL, McGachy HA. The inhibition of monoamine oxidase by tricyclic antidepressants: the influence of the nature of the substrate and the source of the enzyme. J Pharm Pharmacol 1987; 39:392-4. [PMID: 2886590 DOI: 10.1111/j.2042-7158.1987.tb03405.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Five tricyclic antidepressants, amitriptyline, clomipramine, desipramine, imipramine and iprindole, have comparable potencies as inhibitors of monoamine oxidase in rodent brain and liver. With rodent brain, potency was always greater with phenethylamine as substrate than with benzylamine, and was generally least with 5-HT. With mouse liver, in which monoamine oxidase is mainly B type, potency with tyramine and dopamine as substrates was close to that found with phenethylamine. The kinetics of inhibition varied with both the substrate and the tissue, and were inconsistent with a simple ping-pong model for substrate oxidation. The relevance of these observations to clinical effectiveness is discussed.
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49
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Abstract
Previous studies utilizing steroid-binding assays have suggested that corticosteroid-binding globulin (CBG)-like glucocorticoid binding sites are present in various tissues of the rat. It is not known, however, whether such binding reflects the intracellular presence of CBG derived from serum or a special class (type III) of receptors. In order to elucidate this problem, immunocytochemical localization of rat CBG was carried out using a specific antiserum prepared against rat serum CBG and the peroxidase-antiperoxidase technique. Positive staining was found in certain cells of the liver, the distal and/or convoluted tubules of the kidney, the uterus, the follicular cells of the thyroid, and some cells of the anterior pituitary. Other tissues including heart, muscle, thymus, hypothalamus, supraoptic and paraventricular nuclei, and diaphragm were negative. The presence of immunoreactive CBG in specific cells of some glucocorticoid-responsive tissues and not others raises interesting questions concerning the transport of glucocorticoids and their mechanism of action.
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Abstract
Records of 199 children aged 5 to 71 months (mean 22.8) admitted after febrile convulsion were examined. Although 32 had recurrent convulsions (some before admission) none suffered a convulsion more than 24 hours after hospital admission.
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