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Robinson M, O'Cathail S, Duffton A, Aitken K, Muirhead R. Potential for Isotoxic Re-irradiation Stereotactic Ablative Body Radiotherapy in Locally Recurrent Rectal Cancer. Clin Oncol (R Coll Radiol) 2022; 34:571-577. [DOI: 10.1016/j.clon.2022.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/17/2021] [Accepted: 04/13/2022] [Indexed: 12/25/2022]
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Gough J, Hall W, Good J, Nash A, Aitken K. Technical Radiotherapy Advances – The Role of Magnetic Resonance Imaging-Guided Radiation in the Delivery of Hypofractionation. Clin Oncol (R Coll Radiol) 2022; 34:301-312. [DOI: 10.1016/j.clon.2022.02.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/07/2022] [Accepted: 02/23/2022] [Indexed: 12/30/2022]
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Aitken K, Mukherjee S. When Less is More: The Rising Tide of Hypofractionation. Clin Oncol (R Coll Radiol) 2022; 34:277-279. [PMID: 35305887 PMCID: PMC8926304 DOI: 10.1016/j.clon.2022.03.002] [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] [Received: 02/11/2022] [Accepted: 03/01/2022] [Indexed: 11/25/2022]
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Robinson M, O’Cathail S, Duffton A, Aitken K, Muirhead R. PO-1275 Potential for Isotoxic Re-Irradiation SABR in Locally Recurrent Rectal Cancer. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07726-4] [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: 10/20/2022]
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Alexander S, Lawes R, Adair Smith G, Barnes H, Hanson I, Herbert T, Huddart R, Lacey C, McNair H, Mitchell A, Nill S, Ockwell C, Oelfke U, Taylor H, Wetscherek A, Aitken K, Hunt A. PH-0164 Abdominal compression; development of a non-gated pancreas MRIgRT workflow. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07256-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: 11/26/2022]
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Brocklehurst A, Barker CL, Mukherjee S, Aitken K, Macdonald C, Lakey A, Smith H, Radhakrishna G. Stereotactic Ablative Body Radiotherapy for Locally Advanced Unresectable Pancreatic Cancer: Current Views of the Public and Professionals. Clin Oncol (R Coll Radiol) 2020; 33:e198. [PMID: 33158725 DOI: 10.1016/j.clon.2020.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 10/19/2020] [Indexed: 10/23/2022]
Affiliation(s)
| | | | | | - K Aitken
- Royal Marsden Hospital, London, UK
| | | | - A Lakey
- Pancreatic Cancer UK, London, UK
| | - H Smith
- Pancreatic Cancer UK, London, UK
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Aitken K, Good J, Hawkins M, Grose D, Mukherjee S, Harrison M, Radhakrishna G. Liver Stereotactic Ablative Radiotherapy: an Effective and Feasible Alternative to Surgery during the COVID-19 Pandemic. Clin Oncol (R Coll Radiol) 2020; 32:477. [PMID: 32387045 PMCID: PMC7252179 DOI: 10.1016/j.clon.2020.04.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 04/27/2020] [Indexed: 01/08/2023]
Affiliation(s)
- K Aitken
- The Royal Marsden NHS Foundation Trust, London, UK
| | - J Good
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - M Hawkins
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - D Grose
- Beatson West of Scotland Cancer Centre, Glasgow, UK
| | - S Mukherjee
- CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, Oxford, UK
| | - M Harrison
- Mount Vernon Cancer Centre, Northwood, UK
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Bertholet J, Hunt A, Dunlop A, Bird T, Mitchell A, Oelfke U, Nill S, Aitken K. EP-1856 Dose escalation potential for hypofractionated radiotherapy in locally advanced pancreatic cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)32276-5] [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: 11/29/2022]
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Woolcot T, Kousi E, Wells E, Aitken K, Taylor H, Schmidt M. An Evaluation of Marker-based Registration of CT and MR Examinations for Liver SABR Planning. Clin Oncol (R Coll Radiol) 2018. [DOI: 10.1016/j.clon.2018.02.034] [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: 11/29/2022]
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Athauda A, Watkins D, Mohammed K, Ramessur A, Chau I, Starling N, Rao S, Tait D, Aitken K, van As N, Cunningham D. Cisplatin substitution with carboplatin during radical chemoradiation (CRT) for localised gastroesophageal carcinoma (GEC): Outcomes from a tertiary referral centre. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx660.006] [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: 11/12/2022] Open
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Augustin Y, Chaw C, van As N, Tait D, Wells E, Khoo V, Aitken K. Stereotactic Body Radiation Therapy for Pelvic Re-Irradiation: Review of Dose, Toxicity, and Clinical Outcomes. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.2134] [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]
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O'hare AE, Quew R, Aitken K. The Identification of Autism in Children Referred to a Tertiary Speech and Language Clinic and the Implications for Service Delivery. Autism 2016. [DOI: 10.1177/1362361398022005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Edinburgh Children's Hospital speech clinic is a joint paediatric and speech therapy clinic which was first established in 1950 and accepts referrals of children for whom speech and language difficulties are the principal concern. An audit was conducted for children presenting consecutively over January 1993 to January 1994 to identify what proportion of these children had autism and related disorders. The mean age of presentation of all children seen was in their final pre-school year, with 80 percent of children already being managed in the community by other professionals such as speech and language therapists and educational psychologists. Of 103 children, 22 had autism or a related disorder. A retrospective analysis of parental report and clinical assessment at the first clinic consultation confirmed that a complaint of no communication with peers coupled with temper tantrums was highly predictive for membership of this group of disorders. The audit confirmed that the contribution of autism to the children's communication difficulties had not been fully recognized and addressed prior to the speech clinic consultation. The audit has informed our practice and we intend attracting clinical psychology and child psychiatry services into the speech clinic to enhance the service we deliver and also to employ our findings to highlight consideration of autism in the young child with speech and language difficulties.
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Affiliation(s)
| | - R. Quew
- Edinburgh Sick Children's NHS Trust, UK
| | - K. Aitken
- Edinburgh Sick Children's NHS Trust, UK
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Aitken K, Tree A, Thomas K, Nutting C, Hawkins M, Tait D, Mandeville H, Ahmed M, Lalondrelle S, Miah A, Taylor A, Ross G, Khoo V, van As N. Initial UK Experience of Stereotactic Body Radiotherapy for Extracranial Oligometastases: Can We Change the Therapeutic Paradigm? Clin Oncol (R Coll Radiol) 2015; 27:411-9. [PMID: 25912366 DOI: 10.1016/j.clon.2015.03.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 03/10/2015] [Accepted: 03/19/2015] [Indexed: 12/21/2022]
Abstract
AIMS To retrospectively review the toxicity and early outcome data from patients who have received stereotactic body radiotherapy (SBRT) for extracranial oligometastases at a single UK institution. MATERIALS AND METHODS Eligible patients had ≤3 extracranial metastases and performance status ≤2. Prior systemic therapy and radical treatment of oligometastastic relapse with any standard treatment modality was permitted. Patients with synchronous metastatic disease were excluded unless they had evidence of controlled primary disease after radical therapy. Follow-up consisted of clinical examination, biochemical and radiological assessments in accordance with standard clinical care. Progression events were defined using RECIST. Toxicity was evaluated using CTCAE v4.0. Local control, progression-free survival (PFS), freedom from widespread distant metastasis (defined as disease not amenable to further radical salvage therapy) and overall survival were calculated. RESULTS Between July 2011 and April 2014, 73 patients with 87 metastases received SBRT (range 1-3 per patient). The median follow-up was 14.5 months (range 0-26.4). The median PFS was 14.5 months (1 year PFS 57%, 2 year 28%); 1 year overall survival 96%, 2 year 79.8%; 2 year local control 88%. At 2 years, 46% of patients were free from widespread distant metastases. No ≥ grade 3 acute or late toxicity was observed. CONCLUSION At this time point, observed toxicity is minimal with excellent local control rates. This promising treatment paradigm requires further investigation in the context of a randomised controlled trial to establish if the addition of SBRT to standard care improves survival outcomes.
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Affiliation(s)
- K Aitken
- Department of Radiotherapy, Royal Marsden Hospital, London, UK.
| | - A Tree
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - K Thomas
- Department of Statistics, Royal Marsden Hospital, London, UK
| | - C Nutting
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - M Hawkins
- Gray Institute for Radiation Oncology and Biology, University of Oxford, Oxford, UK
| | - D Tait
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - H Mandeville
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - M Ahmed
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - S Lalondrelle
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - A Miah
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - A Taylor
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - G Ross
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - V Khoo
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
| | - N van As
- Department of Radiotherapy, Royal Marsden Hospital, London, UK
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Wells E, Aitken K, Conaghan P, Nutting C, McDonald F. 169 Implementation of Monte Carlo dose calculation for lung SABR plan evaluation: impact on tumour coverage and dose prescription. Lung Cancer 2014. [DOI: 10.1016/s0169-5002(14)70170-9] [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: 10/25/2022]
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15
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Aitken K, Jouin A, Mirabel X, Tait D, Nutting C, Hawkins M. Evaluating Small Bowel Dose–Volume Tolerance Limits for SBRT Using a Preoperative Rectal Radiation Therapy Model: Are We Setting the Bar Too High? Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.141] [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: 11/28/2022]
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16
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Aitken K, Taylor H, Wells E, Tait D, van As N, Taylor A, Lalondrelle S. PO-0751: Stereotactic body radiation therapy (SBRT) for abdominopelvic reirradiation: early results. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33057-7] [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: 11/27/2022]
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17
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Brooks C, Lee Y, Aitken K, Hansen V, Tait D, Hawkins M. Organ-sparing Intensity-modulated Radiotherapy for Anal Cancer using the ACTII Schedule: A Comparison of Conventional and Intensity-modulated Radiotherapy Plans. Clin Oncol (R Coll Radiol) 2013; 25:155-61. [DOI: 10.1016/j.clon.2012.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 08/16/2012] [Accepted: 08/20/2012] [Indexed: 10/27/2022]
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18
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Aitken K, Lamb C, Rosenfelder N, Burke K, Bidmead M, van As N, Khoo V. 1026 poster INTRA-PROSTATIC FIDUCIAL MARKER STABILITY; SUB-MM AVERAGE MARKER DISPLACEMENT THROUGHOUT TREATMENT. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)71148-3] [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]
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19
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Brooks C, Lee Y, Aitken K, Hansen V, Tait D, Hawkins M. Organ Sparing IMRT for Anal Cancer using ACTII Schedule: a Comparison of Conventional and IMRT Plans. Clin Oncol (R Coll Radiol) 2011. [DOI: 10.1016/j.clon.2011.01.402] [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: 11/29/2022]
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20
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Aitken K, Lamb C, Rosenfelder N, Burke K, Bidmead M, Van As N, Khoo V. Assessing the Stability of Prostate Fiducial Markers over a Course of Radiotherapy. Clin Oncol (R Coll Radiol) 2011. [DOI: 10.1016/j.clon.2011.01.391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Shelton D, Aitken K, Doimo L, Leach D, Baverstock P, Henry R. Genetic control of monoterpene composition in the essential oil of Melaleuca alternifolia (Cheel). Theor Appl Genet 2002; 105:377-383. [PMID: 12582541 DOI: 10.1007/s00122-002-0948-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2001] [Accepted: 09/25/2001] [Indexed: 05/24/2023]
Abstract
Previous studies into the population structure of Melaleuca alternifolia by both isozyme and microsatellite analysis revealed little evidence for genetic structuring within genetic provenances. In contrast, analysis of the oil composition within these same regions showed distinct clustering of chemotypes within the provenances suggesting either that chemotype was not under genetic control, or that there is strong environmental selection for plant chemotypes. To investigate the level of genetic control of monoterpene composition in the essential oil of M. alternifolia, individuals representing the three extreme chemotypes of high terpinen-4-ol, high 1,8-cineole and high terpinolene were crossed with an individual with the commercially desirable high terpinen-4-ol oil profile. The progeny resulting from these crosses displayed oil profiles that were intermediate to that of the parent. Further analysis of the survey of oil chemotypes within the natural population also suggests that these intermediate chemotypes may arise naturally between regions containing high proportions of the extreme chemotypes. These results imply that there is a level of genetic structure for chemotype determination within the genetic provenance that is undetected by isozyme and microsatellite analysis. This information could play a vital role in the selection of appropriate genetic material to be used in future essential oil selection and breeding programs.
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Affiliation(s)
- D. Shelton
- Centre for Plant Conservation Genetics, Southern Cross University, Lismore, NSW 2480, Australia,
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22
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Aitken K, Bägl DJ. Stretch-induced bladder smooth muscle cell (SMC) proliferation is mediated by RHAMM-dependent extracellular-regulated kinase (erk) signaling. Urology 2001; 57:109. [PMID: 11378075 DOI: 10.1016/s0090-4295(01)01036-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- K Aitken
- The Research Institute and Division of Urology, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
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23
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Irie-Sasaki J, Sasaki T, Matsumoto W, Opavsky A, Cheng M, Welstead G, Griffiths E, Krawczyk C, Richardson CD, Aitken K, Iscove N, Koretzky G, Johnson P, Liu P, Rothstein DM, Penninger JM. CD45 is a JAK phosphatase and negatively regulates cytokine receptor signalling. Nature 2001; 409:349-54. [PMID: 11201744 DOI: 10.1038/35053086] [Citation(s) in RCA: 405] [Impact Index Per Article: 17.6] [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: 11/09/2022]
Abstract
The regulation of tyrosine phosphorylation and associated signalling through antigen, growth-factor and cytokine receptors is mediated by the reciprocal activities of protein tyrosine kinases and protein tyrosine phosphatases (PTPases). The transmembrane PTPase CD45 is a key regulator of antigen receptor signalling in T and B cells. Src-family kinases have been identified as primary molecular targets for CD45 (ref. 4). However, CD45 is highly expressed in all haematopoietic lineages at all stages of development, indicating that CD45 could regulate other cell types and might act on additional substrates. Here we show that CD45 suppresses JAK (Janus kinase) kinases and negatively regulates cytokine receptor signalling. Targeted disruption of the cd45 gene leads to enhanced cytokine and interferon-receptor-mediated activation of JAKs and STAT (signal transducer and activators of transcription) proteins. In vitro, CD45 directly dephosphorylates and binds to JAKs. Functionally, CD45 negatively regulates interleukin-3-mediated cellular proliferation, erythropoietin-dependent haematopoieisis and antiviral responses in vitro and in vivo. Our data identify an unexpected and novel function for CD45 as a haematopoietic JAK phosphatase that negatively regulates cytokine receptor signalling.
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Affiliation(s)
- J Irie-Sasaki
- Amgen Institute, Department of Medical Biophysics, University of Toronto, Ontario, Canada
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Liu P, Aitken K, Kong YY, Opavsky MA, Martino T, Dawood F, Wen WH, Kozieradzki I, Bachmaier K, Straus D, Mak TW, Penninger JM. The tyrosine kinase p56lck is essential in coxsackievirus B3-mediated heart disease. Nat Med 2000; 6:429-34. [PMID: 10742150 DOI: 10.1038/74689] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [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: 11/08/2022]
Abstract
Infections are thought to be important in the pathogenesis of many heart diseases. Coxsackievirus B3 (CVB3) has been linked to chronic dilated cardiomyopathy, a common cause of progressive heart disease, heart failure and sudden death. We show here that the sarcoma (Src) family kinase Lck (p56lck) is required for efficient CVB3 replication in T-cell lines and for viral replication and persistence in vivo. Whereas infection of wild-type mice with human pathogenic CVB3 caused acute and very severe myocarditis, meningitis, hepatitis, pancreatitis and dilated cardiomyopathy, mice lacking the p56lck gene were completely protected from CVB3-induced acute pathogenicity and chronic heart disease. These data identify a previously unknown function of Src family kinases and indicate that p56lck is the essential host factor that controls the replication and pathogenicity of CVB3.
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Affiliation(s)
- P Liu
- Heart and Stroke/Lewar Centre of Excellence in Cardiovascular Research, University of Toronto, University Health Network, 200 Elizabeth Street, Toronto, Ontario, Canada M5G 2C4
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Opavsky MA, Penninger J, Aitken K, Wen WH, Dawood F, Mak T, Liu P. Susceptibility to myocarditis is dependent on the response of alphabeta T lymphocytes to coxsackieviral infection. Circ Res 1999; 85:551-8. [PMID: 10488058 DOI: 10.1161/01.res.85.6.551] [Citation(s) in RCA: 119] [Impact Index Per Article: 4.8] [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] [Indexed: 11/16/2022]
Abstract
Viral myocarditis is an important cause of heart failure and dilated cardiomyopathy. T lymphocytes are implicated in myocardial damage in murine models of coxsackievirus B3 (CVB3) myocarditis. We used knockout mice lacking CD4 (CD4(-/-)), CD8 (CD8(-/-)), both coreceptors (CD4(-/-)CD8(-/-)), or the T-cell receptor beta chain (TCRbeta(-/-)) to address the contribution of T-cell subpopulations to host susceptibility to CVB3 myocarditis. Severity of disease was magnified in CD8(-/-) mice but attenuated in CD4(-/-) mice, consistent with a pathogenic role for CD4(+) lymphocytes. Elimination of both CD4 and CD8 molecules from T lymphocytes by genetic knockout better protected mice from myocarditis, demonstrating that both CD4(+) and CD8(+) T cells contribute to host susceptibility. The same benefit occurred in TCRbeta(-/-) mice, with prolonged survival and minimal myocardial disease observed after CVB3 infection. Elevated interferon-gamma and decreased tumor necrosis factor-alpha expression are associated with attenuated myocardial damage in CD4(-/-)CD8(-/-) mice. These results show that the presence of TCRalphabeta(+) T cells enhances host susceptibility to myocarditis. The severity of myocardial damage and associated mortality are dependent on the predominant T-cell type available to respond to CVB3 infection. One mechanism by which CD4(+) and CD8(+) T-cell subsets influence the pathogenesis of myocarditis may involve specific cytokine expression patterns.
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Affiliation(s)
- M A Opavsky
- Centre for Cardiovascular Research, The Toronto Hospital, University of Toronto, Toronto, Ontario, Canada
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26
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Barlow KM, Milne S, Aitken K, Minns RA. A retrospective epidemiological analysis of non-accidental head injury in children in Scotland over a 15 year period. Scott Med J 1998; 43:112-4. [PMID: 9757501 DOI: 10.1177/003693309804300407] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A retrospective analysis of the epidemiological characteristics of non-accidental head injury (NAHI) in children in Scotland over the last fifteen years from 1981 until March 1996 was performed. The information was provided by the Information and Statistics Division of the Scottish Health Service. The average incidence of NAHI calculated over this period was 0.04 cases per year per 1000 children under 5 years. Fifty-five per cent of all cases occurred in those children who were less than a year old. 41% of cases were inflicted by a parent but in 47% the perpetrator could not be identified. The mortality rate was found to be 2%. Non-accidental head injury cases identified using the ICD-9 coding classification system gives a surprisingly low incidence. This number is probably an underestimate and the reasons for this are discussed. A prospective epidemiological analysis of NAHI in children in Scotland is being undertaken to determine the true incidence.
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Affiliation(s)
- K M Barlow
- Department of Neurology, Royal Hospital for Sick Children, Edinburgh
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27
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28
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Martino TA, Petric M, Brown M, Aitken K, Gauntt CJ, Richardson CD, Chow LH, Liu PP. Cardiovirulent coxsackieviruses and the decay-accelerating factor (CD55) receptor. Virology 1998; 244:302-14. [PMID: 9601501 DOI: 10.1006/viro.1998.9122] [Citation(s) in RCA: 74] [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: 11/22/2022]
Abstract
Group B coxsackieviruses are etiologically linked with many human diseases including acute myocarditis and associated chronic dilated cardiomyopathy. Well-established CVB3 cardiovirulent strains (CVB3c(s)) with known phenotypic difference have been used to study the pathogenesis of virus-induced heart disease. The receptor-binding characteristics of cardiovirulent CVB3 are not known, but may represent one mechanism accounting for differences in disease virulence. In this study, interactions between CVB3c(s) and the decay-accelerating factor (DAF or CD55) cell surface receptor were examined. Anti-DAF monoclonal antibodies (MAbs) blocked virus binding and infection of susceptible HeLa cells. Virus binding was significantly reduced by treatment of these cells with phosphatidylinositol phospholipase C enzyme, which rendered them DAF-deficient CVB3c(s) exhibited a differential propensity for the DAF receptor, as several cardiovirulent strains interacted more strongly than others. However, virus binding and infection was always most effectively blocked by MAbs directed against the SCR 2 and 3 domains of DAF, suggesting that binding occurs at a similar site(s) on the molecule for all strains. Virus binding and internalization were associated with DAF down-regulation at the cell surface, as monitored by flow cytometry analysis. Cardiovirulent CVB3 did not interact with molecules functionally and/or structurally related to DAF, including CD35, CD46, Factor H, or C4-binding protein. Adenovirus type 2 (Ad2) does not use the DAF receptor. However, competitive binding assays between Ad2 and CVB1-6, CVB3c(s), anti-DAF MAbs, or DAF-reduced cells indicated that DAF is associated with Ad2 receptors on the HeLa cell membrane. In summary, this study indicates that DAF is an attachment receptor for cardiovirulent CVB3 and that DAF interaction may be important in the pathogenesis of CVB-mediated heart disease.
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Affiliation(s)
- T A Martino
- Center for Cardiovascular Research, Toronto Hospital, Ontario, Canada
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29
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Abstract
The pathogenesis of viral myocarditis involves contributions from the virus, the immune system and myocytes. In defining the molecular contributions in the disease process, modulations of the components of the immune system through transgenic knockout models provide useful insights. Advantages of the transgenic knockout models are that they allow biological evaluation of the importance of a particular molecule in the physiological context of an intact organism. Furthermore, the techniques of transgenic knockout models are now standardized, even though they are still technically challenging and time consuming. An example in myocarditis is the IRF-1 knockout mouse, where there is a complete absence of the inducible form of nitric oxide synthetase in the tissues. These animals are exquisitely sensitive to coxsackieviral infection, with extremely high mortality. On the other hand, CD4 knockouts appear to still have myocarditis in an autoimmune myocarditis model, while p56lck knockouts (the T-cell tyrosine kinase signalling molecule) appears to be free of viral myocarditis. These elegant systems of molecular manipu-lation should allow us unique insights into the pathogenesis of myocarditis.
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Affiliation(s)
- P Liu
- Centre for Cardiovascular Research, Canada.
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30
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Atra A, Ward HC, Aitken K, Boyle M, Dicks-Mireaux C, Duffy PG, Mitchell CD, Plowman PN, Ransley PG, Pritchard J. Conservative surgery in multimodal therapy for pelvic rhabdomyosarcoma in children. Br J Cancer 1994; 70:1004-8. [PMID: 7947076 PMCID: PMC2033530 DOI: 10.1038/bjc.1994.438] [Citation(s) in RCA: 33] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Twenty-six previously untreated children, median age 3.4 years, with pelvic rhabdomyosarcoma (RMS) were seen between 1983 and 1988. Fourteen were girls. The planned strategy was to conserve pelvic organs, especially the bladder, by using primary chemotherapy, conservative surgery and, in most cases, radiotherapy. With a median follow-up of 71 months (range 34-103 months) overall survival was 73%, with no treatment-related death. The bladder salvage rate of 88% in survivors with bladder base/prostate primaries was much higher than that reported by the United States Intergroup Rhabdomyosarcoma Studies (IRS), though many of the preserved bladders did not function normally. We identified problems with both radiological and histological off-treatment monitoring. The overall accuracy of computerised tomographic (CT) scanning for prediction of tumour recurrence was only 81%, and endoscopic biopsies proved misleading in four of the ten bladder base/prostate patients monitored by serial cystoscopy. We conclude that a higher cure rate can be achieved by using intensive chemotherapy/radiotherapy and conservative surgery to treat children with pelvic RMS. Factors that might contribute to our favourable bladder salvage results, compared with those of the IRS, include (a) the fact that one of two specialist surgeons monitored and operated on all these patients and (b) our increasing awareness, during the study, that post-chemotherapy/radiotherapy histopathology and pelvic CT scan appearances may be misleading. Referral to paediatric centres with special experience of pelvic RMS may help raise the rate of bladder salvage in these children.
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Affiliation(s)
- A Atra
- Department of Haematology and Oncology, Hospitals for Sick Children, London, UK
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31
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Gupta RS, Aitken K, Falah M, Singh B. Cloning of Giardia lamblia heat shock protein HSP70 homologs: implications regarding origin of eukaryotic cells and of endoplasmic reticulum. Proc Natl Acad Sci U S A 1994; 91:2895-9. [PMID: 8159675 PMCID: PMC43480 DOI: 10.1073/pnas.91.8.2895] [Citation(s) in RCA: 159] [Impact Index Per Article: 5.3] [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: 01/29/2023] Open
Abstract
The genes for two different 70-kDa heat shock protein (HSP70) homologs have been cloned and sequenced from the protozoan Giardia lamblia. On the basis of their sequence features, one of these genes corresponds to the cytoplasmic form of HSP70. The second gene, on the basis of its characteristic N-terminal hydrophobic signal sequence and C-terminal endoplasmic reticulum (ER) retention sequence (Lys-Asp-Glu-Leu), is the equivalent of ER-resident GRP78 or the Bip family of proteins. Phylogenetic trees based on HSP70 sequences show that G. lamblia homologs show the deepest divergence among eukaryotic species. The identification of a GRP78 or Bip homolog in G. lamblia strongly suggests the existence of ER in this ancient eukaryote. Detailed phylogenetic analyses of HSP70 sequences by boot-strap neighbor-joining and maximum-parsimony methods show that the cytoplasmic and ER homologs form distinct subfamilies that evolved from a common eukaryotic ancestor by gene duplication that occurred very early in the evolution of eukaryotic cells. It is postulated that because of the essential "molecular chaperone" function of these proteins in translocation of other proteins across membranes, duplication of their genes accompanied the evolution of ER or nucleus in the eukaryotic cell ancestor. The presence in all eukaryotic cytoplasmic HSP70 homologs (including the cognate, heat-induced, and ER forms) of a number of autapomorphic sequence signatures that are not present in any prokaryotic or organellar homologs provides strong evidence regarding the monophyletic nature of eukaryotic lineage. Further, all eukaryotic HSP70 homologs share in common with the Gram-negative group of eubacteria a number of sequence features that are not present in any archaebacterium or Gram-positive bacterium, indicating their evolution from this group of organisms. Some implications of these findings regarding the evolution of eukaryotic cells and ER are discussed.
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Affiliation(s)
- R S Gupta
- Department of Biochemistry, McMaster University, Hamilton, ON, Canada
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32
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Sury MR, Brown JL, Aitken K. Anaesthesia for conjoined twins during magnetic resonance imaging. Eur J Anaesthesiol 1994; 11:139-42. [PMID: 8174536] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- M R Sury
- Department of Anaesthesia, Hospital for Sick Children, London, UK
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33
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Abstract
Accurate prediction of the response of an individual patient to lithotripsy remains impossible. Certain factors such as the chemical composition, size, and position of the calculus are known to be important in determining the success rate. This paper reports the use of magnetic resonance imaging (MRI) to evaluate 141 urinary calculi in vitro. A wide range of signals for each chemical type of calculus was found on each of the three imaging sequences used (T1-weighted, T2-weighted, and proton density). None of the chemical groups examined showed a typical MRI profile allowing it to be distinguished from the other groups. Analysis of variance showed a statistical difference between signals for apatite and struvite on the T1-weighted sequence, and between struvite and uric acid on the proton density sequence (both, P < 0.05). These results show for the first time that MRI is capable of distinguishing between different chemical types of stones. This is particularly important for the comparison of struvite and apatite which appear to be similar in conventional investigations but have quite different hardness values. Further work is in progress correlating the results of this study with stone microhardness and extracorporeal shockwave lithotripsy fragility tests to determine whether MRI accurately predicts the success of lithotripsy.
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Affiliation(s)
- C Dawson
- Department of Urology, Battle Hospital, Reading, UK
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34
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Affiliation(s)
- K Aitken
- Department of Clinical Psychology, Royal Hospital for Sick Children, Edinburgh
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35
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Aitken K. Examining the evidence for a common structural basis to autism. Dev Med Child Neurol 1991; 33:930-4. [PMID: 1743420 DOI: 10.1111/j.1469-8749.1991.tb14806.x] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- K Aitken
- Department of Clinical Psychology, Royal Hospital for Sick Children, Edinburgh
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36
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37
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Abstract
This study assessed the diagnostic utility of a computerized psychometry battery of tests: the Bexley-Maudsley Automated Psychological Screening Test and Category Sorting Test in the screening for deficits in cognitive function in a population of children who had been treated for acute lymphoblastic leukemia. Central nervous system therapy with radiotherapy and intrathecal chemotherapy has been incriminated as a cause of psychological morbidity in survivors. Twenty-nine children who were surviving in their first hematological remission, following cessation of their treatment for acute lymphoblastic leukemia, were studied. No child had evidence of central nervous system leukemic involvement, and they were all attending normal schools. Their performances were compared with 29 control children matched by age, sex, and social class. The children treated for leukemia showed a reduced ability to sustain attention (p less than 0.025), a reduction in verbal recognition short term memory (p less than 0.02), and difficulties in abstract problem solving (p less than 0.01). These results confirm the presence of neurophysical morbidity in children treated for acute lymphoblastic leukemia. It is suggested that this computerized psychometry test battery is a useful method for examining children at risk of neurological impairment and identifies specific deficits that require further evaluation and remedial help.
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Affiliation(s)
- A E O'Hare
- Paediatric Neurology, Royal Hospital for Sick Children, Edinburgh
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38
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Aitken K. A developmental approach to adult psychopathology. Behav Res Ther 1987. [DOI: 10.1016/0005-7967(87)90078-7] [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: 11/29/2022]
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39
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Aitken K. Child development: a test for the caring professions. Behav Res Ther 1987. [DOI: 10.1016/0005-7967(87)90138-0] [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]
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40
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Aitken K. Clinical behavioral pediatrics: an interdisciplinary biobehavioral approach. Behav Res Ther 1985. [DOI: 10.1016/0005-7967(85)90184-6] [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]
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