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Kim SJ, Schneidman-Duhovny D, de Groot PG, Urbanus RT, Carter L, de Laat-Kremers R, Weiss TM, Chan MK, Sali A, Rand JH, de Laat B. Identification of thrombosis-related conformational binding epitopes on domain I of β2-glycoprotein I. Thromb Res 2024; 237:145-147. [PMID: 38593525 DOI: 10.1016/j.thromres.2024.03.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 03/15/2024] [Accepted: 03/25/2024] [Indexed: 04/11/2024]
Affiliation(s)
- Seung Joong Kim
- Department of Bioengineering and Therapeutic Sciences, University of California at San Francisco, United States of America; Departments of Physics and Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Dina Schneidman-Duhovny
- Department of Bioengineering and Therapeutic Sciences, University of California at San Francisco, United States of America; School of Computer Science and Engineering, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Philip G de Groot
- Department of Functional Coagulation, Synapse Research Institute, Maastricht, the Netherlands; Department of Clinical Chemistry and Hematology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Rolf T Urbanus
- Department of Clinical Chemistry and Hematology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Lester Carter
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, United States of America
| | - Romy de Laat-Kremers
- Department of Data Analysis and Artificial Intelligence, Synapse Research Institute, Maastricht, the Netherlands
| | - Thomas M Weiss
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, United States of America
| | - Man K Chan
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461, United States of America
| | - Andrej Sali
- Department of Bioengineering and Therapeutic Sciences, University of California at San Francisco, United States of America
| | - Jacob H Rand
- Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, United States of America
| | - Bas de Laat
- Department of Functional Coagulation, Synapse Research Institute, Maastricht, the Netherlands; Department of Data Analysis and Artificial Intelligence, Synapse Research Institute, Maastricht, the Netherlands.
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2
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Turkova A, Chan MK, Kityo C, Kekitiinwa AR, Musoke P, Violari A, Variava E, Archary M, Cressey TR, Chalermpantmetagul S, Sawasdichai K, Ounchanum P, Kanjanavanit S, Srirojana S, Srirompotong U, Welch S, Bamford A, Epalza C, Fortuny C, Colbers A, Nastouli E, Walker S, Carr D, Conway M, Spyer MJ, Parkar N, White I, Nardone A, Thomason MJ, Ferrand RA, Giaquinto C, Ford D. D3/Penta 21 clinical trial design: A randomised non-inferiority trial with nested drug licensing substudy to assess dolutegravir and lamivudine fixed dose formulations for the maintenance of virological suppression in children with HIV-1 infection, aged 2 to 15 years. Contemp Clin Trials 2024; 142:107540. [PMID: 38636725 DOI: 10.1016/j.cct.2024.107540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/29/2024] [Accepted: 04/15/2024] [Indexed: 04/20/2024]
Abstract
BACKGROUND There is increasing interest in utilising two-drug regimens for HIV treatment with the goal of reducing toxicity and improve acceptability. The D3 trial evaluates the efficacy and safety of DTG/3TC in children and adolescents and includes a nested pharmacokinetics(PK) substudy for paediatric drug licensing. METHODS D3 is an ongoing open-label, phase III, 96-week non-inferiority randomised controlled trial(RCT) conducted in South Africa, Spain, Thailand, Uganda and the United Kingdom. D3 has enrolled 386 children aged 2- < 15 years, virologically suppressed for ≥6 months, with no prior treatment failure. Participants were randomised 1:1 to receive DTG/3TC or DTG plus two nucleoside reverse transcriptase inhibitors(NRTIs), stratified by region, age (2- < 6, 6- < 12, 12- < 15 years) and DTG use at enrolment (participants permitted to start DTG at enrolment). The primary outcome is confirmed HIV-1 RNA viral rebound ≥50 copies/mL by 96-weeks. The trial employs the Smooth Away From Expected(SAFE) non-inferiority frontier, which specifies the non-inferiority margin and significance level based on the observed event risk in the control arm. The nested PK substudy evaluates WHO weight-band-aligned dosing in the DTG/3TC arm. DISCUSSION D3 is the first comparative trial evaluating DTG/3TC in children and adolescents. Implications of integrating a PK substudy and supplying data for prompt regulatory submission, were carefully considered to ensure the integrity of the ongoing trial. The trial uses an innovative non-inferiority frontier for the primary analysis to allow for a lower-than-expected confirmed viral rebound risk in the control arm, while ensuring interpretability of results and maintaining the planned sample size in an already funded trial. TRIAL REGISTRATION International Standard Randomised Clinical Trial Number Register: ISRCTN17157458. European Clinical Trials Database: 2020-001426-57. CLINICALTRIALS gov: NCT04337450.
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Affiliation(s)
- Anna Turkova
- Medical Research Council Clinical Trials Unit at University College London, UK.
| | - Man K Chan
- Medical Research Council Clinical Trials Unit at University College London, UK
| | - Cissy Kityo
- Joint Clinical Research Centre, Kampala, Uganda
| | | | - Philippa Musoke
- Makerere University-Johns Hopkins University Research Collaboration, Kampala, Uganda
| | - Avy Violari
- Perinatal HIV Research Unit, University of the Witwarsrand, Johannesburg, South Africa
| | - Ebrahim Variava
- Perinatal HIV Research Unit, University of the Witwarsrand, Johannesburg, South Africa
| | - Moherndran Archary
- Department of Paediatrics and Children Health, King Edward VIII Hospital, Enhancing Care Foundation, University of KwaZulu-Natal, Durban, South Africa
| | - Tim R Cressey
- AMS-IRD PHPT Research Collaboration, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | - Suwalai Chalermpantmetagul
- AMS-IRD PHPT Research Collaboration, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | | | | | | | | | | | - Steven Welch
- Heartlands Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Alasdair Bamford
- Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK; University College London Great Ormond Street Institute of Child Health, London, UK
| | - Cristina Epalza
- Instituto de Investigación Sanitaria Hospital, 12 de Octubre (imas12), Madrid, Spain
| | - Clàudia Fortuny
- Infectious Diseases Department, Institut de Recerca Sant Joan de Déu, Sant Joan de Déu Children's Hospital, Barcelona, Spain; Department of Surgery and Medico-Surgical Specialties, Faculty of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
| | - Angela Colbers
- Department of Pharmacy, Radboud Institute for Medical InnovationHealth Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Eleni Nastouli
- University College London Great Ormond Street Institute of Child Health, London, UK; University College London Hospitals NHS Trust, Advanced Pathogen Diagnostics Unit, London, UK
| | - Simon Walker
- Centre for Health Economics, University of York, Heslington, York, UK
| | - Dan Carr
- Department of Molecular and Clinical Pharmacology, University of Liverpool, UK
| | | | - Moira J Spyer
- Medical Research Council Clinical Trials Unit at University College London, UK; University College London Great Ormond Street Institute of Child Health, London, UK
| | - Nazia Parkar
- Medical Research Council Clinical Trials Unit at University College London, UK
| | - Iona White
- Medical Research Council Clinical Trials Unit at University College London, UK
| | | | - Margaret J Thomason
- Medical Research Council Clinical Trials Unit at University College London, UK
| | | | - Carlo Giaquinto
- Fondazione Penta ETS, Padova, Italy; University of Padova, Department of Women and Child Health, Padova, Italy
| | - Deborah Ford
- Medical Research Council Clinical Trials Unit at University College London, UK
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3
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Abdalla S, Compagnucci A, Riault Y, Chan MK, Bamford A, Nolan A, Ramos JT, Constant V, Nguyen TN, Zheng Y, Tréluyer JM, Froelicher-Bournaud L, Neveux N, Saidi Y, Cressey TR, Hirt D. Simultaneous pharmacokinetic modeling of unbound and total darunavir with ritonavir in adolescents: a substudy of the SMILE trial. Antimicrob Agents Chemother 2024; 68:e0100423. [PMID: 38092664 PMCID: PMC10848770 DOI: 10.1128/aac.01004-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 11/14/2023] [Indexed: 02/08/2024] Open
Abstract
Darunavir (DRV) is an HIV protease inhibitor commonly used as part of antiretroviral treatment regimens globally for children and adolescents. It requires a pharmacological booster, such as ritonavir (RTV) or cobicistat. To better understand the pharmacokinetics (PK) of DRV in this younger population and the importance of the RTV boosting effect, a population PK substudy was conducted within SMILE trial, where the maintenance of HIV suppression with once daily integrate inhibitor + darunavir/ritonavir in children and adolescents is evaluated. A joint population PK model that simultaneously used total DRV, unbound DRV, and total RTV concentrations was developed. Competitive and non-competitive models were examined to define RTV's influence on DRV pharmacokinetics. Linear and non-linear equations were tested to assess DRV protein binding. A total of 443 plasma samples from 152 adolescents were included in this analysis. Darunavir PK was best described by a one-compartment model first-order absorption and elimination. The influence of RTV on DRV pharmacokinetics was best characterized by ritonavir area under the curve on DRV clearance using a power function. The association of non-linear and linear equations was used to describe DRV protein binding to alpha-1 glycoprotein and albumin, respectively. In our population, simulations indicate that 86.8% of total and unbound DRV trough concentrations were above 0.55 mg/L [10 times protein binding-adjusted EC50 for wild-type (WT) HIV-1] and 0.0243 mg/L (10 times EC90 for WT HIV-1) targets, respectively. Predictions were also in agreement with observed outcomes from adults receiving 800/100 mg DRV/r once a day. Administration of 800/100 mg of DRV/r once daily provides satisfactory concentrations and exposures for adolescents aged 12 years and older.
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Affiliation(s)
- Seef Abdalla
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
- Service de Pharmacologie Clinique, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
| | - Alexandra Compagnucci
- SC10-US019 Essais Thérapeutiques et Maladies Infectieuses, INSERM, Villejuif, France
| | - Yoann Riault
- SC10-US019 Essais Thérapeutiques et Maladies Infectieuses, INSERM, Villejuif, France
| | - Man K. Chan
- MRC Clinical Trials Unit at UCL, London, United Kingdom
| | - Alasdair Bamford
- MRC Clinical Trials Unit at UCL, London, United Kingdom
- Paediatric Infectious Diseases, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Aoife Nolan
- MRC Clinical Trials Unit at UCL, London, United Kingdom
| | - José T. Ramos
- Department of Pediatrics, Fundación de Investigación Biomédica Hospital Clínico San Carlos, Hospital Clínico San Carlos, Madrid, Spain
- Centro de Investigación Biomédica en Red en Enfermedades Infecciosas, Universidad Complutense de Madrid, Madrid, Spain
| | - Valentin Constant
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
| | - Thao-Nguyen Nguyen
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
| | - Yi Zheng
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
| | - Jean-Marc Tréluyer
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
- Service de Pharmacologie Clinique, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
- Unité de Recherche Clinique, Hôpital Necker Enfants Malades, APHP Centre–Université Paris Cité, Paris, France
| | - Léo Froelicher-Bournaud
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
- Service de Pharmacologie Clinique, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
| | - Nathalie Neveux
- Service de Biochimie, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
| | - Yacine Saidi
- SC10-US019 Essais Thérapeutiques et Maladies Infectieuses, INSERM, Villejuif, France
| | - Tim R. Cressey
- AMS-PHPT Research Collaboration, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
- Department of Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, United Kingdom
| | - Déborah Hirt
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
- Service de Pharmacologie Clinique, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
| | - on behalf of the SMILE study group
- Pharmacologie et évaluation des thérapeutiques chez l'enfant et la femme enceinte, Université Paris Cité, Paris, France
- Service de Pharmacologie Clinique, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
- SC10-US019 Essais Thérapeutiques et Maladies Infectieuses, INSERM, Villejuif, France
- MRC Clinical Trials Unit at UCL, London, United Kingdom
- Paediatric Infectious Diseases, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
- Department of Pediatrics, Fundación de Investigación Biomédica Hospital Clínico San Carlos, Hospital Clínico San Carlos, Madrid, Spain
- Centro de Investigación Biomédica en Red en Enfermedades Infecciosas, Universidad Complutense de Madrid, Madrid, Spain
- Unité de Recherche Clinique, Hôpital Necker Enfants Malades, APHP Centre–Université Paris Cité, Paris, France
- Service de Biochimie, Hôpital Cochin, APHP Centre–Université Paris Cité, Paris, France
- AMS-PHPT Research Collaboration, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
- Department of Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, United Kingdom
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Compagnucci A, Chan MK, Saïdi Y, Cressey TR, Bamford A, Riault Y, Coelho A, Nolan A, Chalermpantmetagul S, Morkunaite G, Amuge P, Musiime V, Violari A, Cotton M, Kekitiinwa AR, Kaudha E, Groenewald M, Liberty AA, Kanjanavanit S, Volokha A, Bologna R, Pavia Ruz N, Prieto Tato L, Paioni P, Marques L, Reliquet V, Niehues T, Welch SB, Ford D, Giaquinto C, Gibb DM, Babiker A, Ramos Amador JT. Nucleoside/nucleotide reverse transcriptase inhibitor sparing regimen with once daily integrase inhibitor plus boosted darunavir is non-inferior to standard of care in virologically-suppressed children and adolescents living with HIV - Week 48 results of the randomised SMILE Penta-17-ANRS 152 clinical trial. EClinicalMedicine 2023; 60:102025. [PMID: 37304494 PMCID: PMC10251070 DOI: 10.1016/j.eclinm.2023.102025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/11/2023] [Accepted: 05/11/2023] [Indexed: 06/13/2023] Open
Abstract
Background Integrase inhibitor (INSTI) with boosted darunavir (DRV/r), a regimen with a high-resistance barrier, avoiding NRTI toxicities, might be a switching option in children living with HIV (CLWHIV). Methods SMILE is a randomised non-inferiority trial evaluating safety and antiviral efficacy of once-daily INSTI + DRV/r vs. continuing on current standard-of-care (SOC) triple ART (2NRTI + boosted PI/NNRTI) in virologically-suppressed CLWHIV aged 6-18 years. The primary outcome is the proportion with confirmed HIV-RNA ≥50 copies/mL by week 48, estimated by Kaplan-Meier method. Non-inferiority margin was 10%. Registration number for SMILE are: ISRCTN11193709, NCT #: NCT02383108. Findings Between 10th June 2016 and 30th August 2019, 318 participants were enrolled from Africa 53%, Europe 24%, Thailand 15% and Latin America 8%, 158 INSTI + DRV/r [153 Dolutegravir (DTG); 5 Elvitegravir (EVG)], 160 SOC. Median (range) age was 14.7 years (7.6-18.0); CD4 count 782 cells/mm3 (227-1647); 61% female. Median follow-up was 64.3 weeks with no loss to follow-up. By 48 weeks, 8 INSTI + DRV/r vs. 12 SOC had confirmed HIV-RNA ≥50 copies/mL; difference (INSTI + DRV/r-SOC) -2.5% (95% CI: -7.6, 2.5%), showing non-inferiority. No major PI or INSTI resistance mutations were observed. There were no differences in safety between arms. By week 48, difference (INSTI + DRV/r-SOC) in mean CD4 count change from baseline was -48.3 cells/mm3 (95% CI: -93.4, -3.2; p = 0.036). Difference (INSTI + DRV/r-SOC) in mean HDL change from baseline was -4.1 mg/dL (95% CI: -6.7, -1.4; p = 0.003). Weight and Body Mass Index (BMI) increased more in INSTI + DRV/r than SOC [difference: 1.97 kg (95% CI: 1.1, 2.9; p < 0.001), 0.66 kg/m2 (95% CI: 0.3, 1.0; p < 0.001)]. Interpretation In virologically-suppressed children, switching to INSTI + DRV/r was non-inferior virologically, with similar safety profile, to continuing SOC. Small but significant differences in CD4, HDL-cholesterol, weight and BMI were observed between INSTI + DRV/r vs. SOC although clinical relevance needs further investigation. SMILE data corroborate adult findings and provide evidence for this NRTI-sparing regimen for children and adolescents. Funding Fondazione Penta Onlus, Gilead, Janssen, INSERM/ANRS and UK MRC. ViiV-Healthcare provided Dolutegravir.
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Affiliation(s)
| | | | - Yacine Saïdi
- INSERM SC10-US19, Essais Thérapeutiques et Maladies Infectieuses, Villejuif, France
| | - Tim R. Cressey
- AMS-CMU & IRD Research Collaboration, Faculty of Associated Medical Sciences (AMS), Chiang Mai University, Thailand
| | - Alasdair Bamford
- MRC Clinical Trials Unit at UCL, London, UK
- Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
- UCL Great Ormond Street Institute of Child Health, London, UK
| | - Yoann Riault
- INSERM SC10-US19, Essais Thérapeutiques et Maladies Infectieuses, Villejuif, France
| | - Alexandra Coelho
- INSERM SC10-US19, Essais Thérapeutiques et Maladies Infectieuses, Villejuif, France
| | | | - Suwalai Chalermpantmetagul
- AMS-CMU & IRD Research Collaboration, Faculty of Associated Medical Sciences (AMS), Chiang Mai University, Thailand
| | | | - Pauline Amuge
- Baylor College of Medicine Children's Foundation, Kampala, Uganda
| | - Victor Musiime
- Joint Clinical Research Centre, Lubowa, Kampala, Uganda
- Makerere University, Department of Paediatrics and Child Health, Kampala, Uganda
| | - Avy Violari
- Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Mark Cotton
- FAMCRU, Department of Paediatrics & Child Health, Family Center for Research with Ubuntu, Stellenbosch University, South Africa
| | | | | | - Marisa Groenewald
- FAMCRU, Department of Paediatrics & Child Health, Family Center for Research with Ubuntu, Stellenbosch University, South Africa
| | - Afaaf A. Liberty
- Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | | | - Alla Volokha
- Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine
| | | | - Noris Pavia Ruz
- Clínica para niños con VIH, UNAM/HGM; Unidad de Investigación en Medicina Experimental, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | | | - Paolo Paioni
- Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zurich, Zurich, Switzerland
| | - Laura Marques
- Centro Materno-Infantil do Norte, CHU Porto, Porto, Portugal
| | - Véronique Reliquet
- Infectious Diseases Department, CHU Hôtel Dieu and INSERM UIC 1413, Nantes University, Nantes, France
| | - Tim Niehues
- Centre for Child Health and Adolescence, Helios Klinikum Krefeld, Academic Hospital, RWTH Aachen, Krefeld, Germany
| | - Steven B. Welch
- Department of Paediatrics, Heartlands Hospital, University Hospitals Birmingham, Birmingham, UK
| | | | - Carlo Giaquinto
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | | | | | - Jose Tomas Ramos Amador
- Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC); Fundación para la Investigación Biomédica HCSC; Hospital Clínico San Carlos, Universidad Complutense, Madrid, Spain
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Harrison N, Chan MK. Harrison and Chan Reply. Phys Rev Lett 2023; 130:199702. [PMID: 37243646 DOI: 10.1103/physrevlett.130.199702] [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] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/06/2023] [Indexed: 05/29/2023]
Affiliation(s)
- N Harrison
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - M K Chan
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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6
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Turkova A, Waalewijn H, Chan MK, Bollen PDJ, Bwakura-Dangarembizi MF, Kekitiinwa AR, Cotton MF, Lugemwa A, Variava E, Ahimbisibwe GM, Srirompotong U, Mumbiro V, Amuge P, Zuidewind P, Ali S, Kityo CM, Archary M, Ferrand RA, Violari A, Gibb DM, Burger DM, Ford D, Colbers A. Dolutegravir twice-daily dosing in children with HIV-associated tuberculosis: a pharmacokinetic and safety study within the open-label, multicentre, randomised, non-inferiority ODYSSEY trial. Lancet HIV 2022; 9:e627-e637. [PMID: 35868341 PMCID: PMC9630157 DOI: 10.1016/s2352-3018(22)00160-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 05/12/2022] [Accepted: 05/17/2022] [Indexed: 11/20/2022]
Abstract
BACKGROUND Children with HIV-associated tuberculosis (TB) have few antiretroviral therapy (ART) options. We aimed to evaluate the safety and pharmacokinetics of dolutegravir twice-daily dosing in children receiving rifampicin for HIV-associated TB. METHODS We nested a two-period, fixed-order pharmacokinetic substudy within the open-label, multicentre, randomised, controlled, non-inferiority ODYSSEY trial at research centres in South Africa, Uganda, and Zimbabwe. Children (aged 4 weeks to <18 years) with HIV-associated TB who were receiving rifampicin and twice-daily dolutegravir were eligible for inclusion. We did a 12-h pharmacokinetic profile on rifampicin and twice-daily dolutegravir and a 24-h profile on once-daily dolutegravir. Geometric mean ratios for trough plasma concentration (Ctrough), area under the plasma concentration time curve from 0 h to 24 h after dosing (AUC0-24 h), and maximum plasma concentration (Cmax) were used to compare dolutegravir concentrations between substudy days. We assessed rifampicin Cmax on the first substudy day. All children within ODYSSEY with HIV-associated TB who received rifampicin and twice-daily dolutegravir were included in the safety analysis. We described adverse events reported from starting twice-daily dolutegravir to 30 days after returning to once-daily dolutegravir. This trial is registered with ClinicalTrials.gov (NCT02259127), EudraCT (2014-002632-14), and the ISRCTN registry (ISRCTN91737921). FINDINGS Between Sept 20, 2016, and June 28, 2021, 37 children with HIV-associated TB (median age 11·9 years [range 0·4-17·6], 19 [51%] were female and 18 [49%] were male, 36 [97%] in Africa and one [3%] in Thailand) received rifampicin with twice-daily dolutegravir and were included in the safety analysis. 20 (54%) of 37 children enrolled in the pharmacokinetic substudy, 14 of whom contributed at least one evaluable pharmacokinetic curve for dolutegravir, including 12 who had within-participant comparisons. Geometric mean ratios for rifampicin and twice-daily dolutegravir versus once-daily dolutegravir were 1·51 (90% CI 1·08-2·11) for Ctrough, 1·23 (0·99-1·53) for AUC0-24 h, and 0·94 (0·76-1·16) for Cmax. Individual dolutegravir Ctrough concentrations were higher than the 90% effective concentration (ie, 0·32 mg/L) in all children receiving rifampicin and twice-daily dolutegravir. Of 18 children with evaluable rifampicin concentrations, 15 (83%) had a Cmax of less than the optimal target concentration of 8 mg/L. Rifampicin geometric mean Cmax was 5·1 mg/L (coefficient of variation 71%). During a median follow-up of 31 weeks (IQR 30-40), 15 grade 3 or higher adverse events occurred among 11 (30%) of 37 children, ten serious adverse events occurred among eight (22%) children, including two deaths (one tuberculosis-related death, one death due to traumatic injury); no adverse events, including deaths, were considered related to dolutegravir. INTERPRETATION Twice-daily dolutegravir was shown to be safe and sufficient to overcome the rifampicin enzyme-inducing effect in children, and could provide a practical ART option for children with HIV-associated TB. FUNDING Penta Foundation, ViiV Healthcare, UK Medical Research Council.
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Affiliation(s)
- Anna Turkova
- Medical Research Council Clinical Trials Unit, University College London, London, UK.
| | - Hylke Waalewijn
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Man K Chan
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Pauline D J Bollen
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | | | | | - Mark F Cotton
- Children's Infectious Diseases Clinical Research Unit, Family Center for Research with Ubuntu, Department of Paediatrics and Child Health, University of Stellenbosch, Cape Town, South Africa
| | | | - Ebrahim Variava
- Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | | | | | - Vivian Mumbiro
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | - Peter Zuidewind
- Children's Infectious Diseases Clinical Research Unit, Family Center for Research with Ubuntu, Department of Paediatrics and Child Health, University of Stellenbosch, Cape Town, South Africa
| | - Shabinah Ali
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | | | - Moherndran Archary
- Department of Paediatrics and Child Health, King Edward VIII Hospital, Enhancing Care Foundation, University of KwaZulu-Natal, Durban, South Africa
| | | | - Avy Violari
- Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Diana M Gibb
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - David M Burger
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Deborah Ford
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Angela Colbers
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
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Harrison N, Chan MK. Magic Gap Ratio for Optimally Robust Fermionic Condensation and Its Implications for High-T_{c} Superconductivity. Phys Rev Lett 2022; 129:017001. [PMID: 35841553 DOI: 10.1103/physrevlett.129.017001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 03/22/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Bardeen-Schrieffer-Cooper (BCS) and Bose-Einstein condensation (BEC) occur at opposite limits of a continuum of pairing interaction strength between fermions. A crossover between these limits is readily observed in a cold atomic Fermi gas. Whether it occurs in other systems such as the high temperature superconducting cuprates has remained an open question. We uncover here unambiguous evidence for a BCS-BEC crossover in the cuprates by identifying a universal magic gap ratio 2Δ/k_{B}T_{c}≈6.5 (where Δ is the pairing gap and T_{c} is the transition temperature) at which paired fermion condensates become optimally robust. At this gap ratio, corresponding to the unitary point in a cold atomic Fermi gas, the measured condensate fraction N_{0} and the height of the jump δγ(T_{c}) in the coefficient γ of the fermionic specific heat at T_{c} are strongly peaked. In the cuprates, δγ(T_{c}) is peaked at this gap ratio when Δ corresponds to the antinodal spectroscopic gap, thus reinforcing its interpretation as the pairing gap. We find the peak in δγ(T_{c}) also to coincide with a normal state maximum in γ, which is indicative of a pairing fluctuation pseudogap above T_{c}.
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Affiliation(s)
- N Harrison
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - M K Chan
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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8
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Waalewijn H, Chan MK, Bollen PDJ, Mujuru HA, Makumbi S, Kekitiinwa AR, Kaudha E, Sarfati T, Musoro G, Nanduudu A, Lugemwa A, Amuge P, Moore CL, Rojo P, Giaquinto C, Colbers A, Gibb DM, Ford D, Turkova A, Burger DM. Dolutegravir dosing for children with HIV weighing less than 20 kg: pharmacokinetic and safety substudies nested in the open-label, multicentre, randomised, non-inferiority ODYSSEY trial. Lancet HIV 2022; 9:e341-e352. [PMID: 35189082 PMCID: PMC9046096 DOI: 10.1016/s2352-3018(21)00292-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/26/2021] [Accepted: 10/27/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND Dolutegravir-based antiretroviral therapy is a preferred first-line treatment for adults and children living with HIV; however, very little pharmacokinetic data for dolutegravir use are available in young children. We therefore aimed to evaluate dolutegravir dosing and safety in children weighing 3 kg to less than 20 kg by assessing pharmacokinetic parameters and safety data in children taking dolutegravir within the ODYSSEY trial. METHODS We did pharmacokinetic substudies nested within the open-label, multicentre, randomised, non-inferiority ODYSSEY trial. We enrolled children from seven research centres in South Africa, Uganda, and Zimbabwe. Children weighing 3 kg to less than 14 kg received 5 mg dispersible tablets of dolutegravir according to WHO weight bands: 5 mg for children weighing 3 kg to less than 6 kg and younger than 6 months, 10 mg for children weighing 3 kg to less than 6 kg and aged 6 months or older, 15 mg for children weighing 6 kg to less than 10 kg, and 20 mg for children weighing 10 kg to less than 14 kg. Children weighing 14 kg to less than 20 kg received a 25 mg film-coated tablet once per day early in the trial or 25 mg dispersible tablets (five 5 mg tablets once per day) later in the trial. A minimum of eight children per weight band or dose was targeted for 24 h pharmacokinetic profiling at steady state. The primary pharmacokinetic parameter was the trough concentration 24 h after observed dolutegravir intake (Ctrough). Pharmacokinetic targets were based on adult dolutegravir Ctrough and the 90% effective concentration (EC90; ie, 0·32 mg/L). Safety was evaluated in eligible children consenting to pharmacokinetic substudies. FINDINGS Between May 25, 2017, and Aug 15, 2019, we enrolled 72 children aged between 3 months and 11 years. 71 children were included in the safety population and 55 (76%) of 72 children contributed 65 evaluable pharmacokinetic profiles. Geometric mean Ctrough in children on dispersible tablets in weight bands between 3 kg and less than 20 kg ranged between 0·53-0·87 mg/L, comparable to the adult geometric mean Ctrough of 0·83 mg/L. Variability was high with coefficient of variation percentages ranging between 50% and 150% compared with 26% in adults. Ctrough below EC90 was observed in four (31%) of 13 children weighing 6 kg to less than 10 kg taking 15 mg dispersible tablets, and four (21%) of 19 weighing 14 kg to less than 20 kg taking 25 mg film-coated tablets. The lowest geometric mean Ctrough of 0·44 mg/L was observed in children weighing 14 kg to less than 20 kg on 25 mg film-coated tablets. Exposures were 1·7-2·0 times higher on 25 mg dispersible tablets versus 25 mg film-coated tablets. 19 (27%) of 71 children had 29 reportable grade 3 or higher adverse events (13 serious adverse events, including two deaths), none of which were related to dolutegravir. INTERPRETATION Weight-band dosing of paediatric dolutegravir dispersible tablets provides appropriate drug exposure in most children weighing 3 kg to less than 20 kg, with no safety signal. 25 mg film-coated tablets did not achieve pharmacokinetic parameters in children weighing 14 kg to less than 20 kg, which were comparable to adults, suggesting dosing with dispersible tablets is preferable or a higher film-coated tablet dose is required. FUNDING Paediatric European Network for Treatment of AIDS Foundation, ViiV Healthcare, and UK Medical Research Council.
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Affiliation(s)
- Hylke Waalewijn
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Man K Chan
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - Pauline D J Bollen
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Hilda A Mujuru
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | | | | | - Tatiana Sarfati
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - Godfrey Musoro
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | | | - Pauline Amuge
- Baylor College of Medicine Children's Foundation, Kampala, Uganda
| | - Cecilia L Moore
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - Pablo Rojo
- University Hospital October 12, Madrid, Spain
| | - Carlo Giaquinto
- Department for Woman's and Child's Health, University of Padova, Padova, Italy
| | - Angela Colbers
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands.
| | - Diana M Gibb
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - Deborah Ford
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - Anna Turkova
- Medical Research Council Clinical Trials Unit at University College London, University College London, London, UK
| | - David M Burger
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands
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Li W, Mak KL, Yau TW, Lam TL, Chan CL, Lai KC, Chan MK, Fong STB. Osteosarcoma arising in a case of osteofibrous dysplasia of tibia with classic adamantinoma: A case report and literature review. Journal of Orthopaedics, Trauma and Rehabilitation 2021. [DOI: 10.1177/22104917211025808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] Open
Abstract
A five-year-old boy presented with left tibial swelling; there was a typical radiological feature of osteofibrous dysplasia. He was observed until the age of 14 years; there was development of aggressive radiological features. Biopsy revealed chondroblastic osteosarcoma. It was excised and the histology revealed chondroblastic osteosarcoma. A small lesion distal to the main tumour revealed adamantinoma within a background of feature of osteofibrous dysplasia. Proximally, feature of osteofibrous dysplasia was identified focally. The finding of adamantinoma over the distal part of the lesion supports that feature of osteofibrous dysplasia may be a precursor of adamantinoma. They may be a spectrum of diseases with multistep neoplastic transformation. The osteosarcoma may be a result of de-differentiation from adamantinoma. This case is remarkable as the patient was only 14 years old and the tumour showed typical features of osteosarcoma, with feature of osteofibrous dysplasia and adamantinoma found in the same specimen. Feature of osteofibrous dysplasia may be a precursor of adamantinoma, and adamantinoma may dedifferentiate into osteosarcoma.
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Affiliation(s)
- Weiguo Li
- Department of Orthopedics & Traumatology, Queen Elizabeth Hospital, Hong Kong
| | - Ka-Lok Mak
- Department of Orthopedics & Traumatology, Queen Elizabeth Hospital, Hong Kong
| | - Tsz W Yau
- Department of Pathology, Queen Elizabeth Hospital, Hong Kong
| | - Tit L Lam
- Department of Pathology, Queen Elizabeth Hospital, Hong Kong
| | - Chak L Chan
- Department of Pathology, Queen Elizabeth Hospital, Hong Kong
| | - Kwok C Lai
- Department of Diagnostic Radiology & Imaging, Queen Elizabeth Hospital, Hong Kong
| | - Man K Chan
- Department of Diagnostic Radiology & Imaging, Queen Elizabeth Hospital, Hong Kong
| | - Sin TB Fong
- Department of Orthopedics & Traumatology, Queen Elizabeth Hospital, Hong Kong
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10
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Payne H, Chan MK, Watters SA, Otwombe K, Hsiao NY, Babiker A, Violari A, Cotton MF, Gibb DM, Klein NJ. Early ART-initiation and longer ART duration reduces HIV-1 proviral DNA levels in children from the CHER trial. AIDS Res Ther 2021; 18:63. [PMID: 34587974 PMCID: PMC8482761 DOI: 10.1186/s12981-021-00389-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 09/16/2021] [Indexed: 11/21/2022] Open
Abstract
Background Reduction of the reservoir of latent HIV-infected cells might increase the possibility of long-term remission in individuals living with HIV. We investigated factors associated with HIV-1 proviral DNA levels in children receiving different antiretroviral therapy (ART) strategies in the children with HIV early antiretroviral therapy (CHER) trial. Methods Infants with HIV < 12 weeks old with CD4% ≥ 25% were randomized in the CHER trial to early limited ART for 40 or 96 weeks (ART-40 W, ART-96 W), or deferred ART (ART-Def). For ART-Def infants or following ART interruption in ART-40 W/ART-96 W, ART was started/re-started for clinical progression or CD4% < 25%. In 229 participants, HIV-1 proviral DNA was quantified by PCR from stored peripheral blood mononuclear cells from children who had received ≥ 24 weeks ART and two consecutive undetectable HIV-1 RNA 12–24 weeks apart. HIV-1 proviral DNA was compared between ART-Def and ART-96 W at week 96, and in all arms at week 248. Factors associated with HIV-1 proviral DNA levels were evaluated using linear regression. Findings Longer duration of ART was significantly associated with lower HIV-1 proviral DNA at both 96 (p = 0.0003) and 248 weeks (p = 0.0011). Higher total CD8 count at ART initiation was associated with lower HIV-1 proviral DNA at both 96 (p = 0.0225) and 248 weeks (p = 0.0398). Week 248 HIV-1 proviral DNA was significantly higher in those with positive HIV-1 serology at week 84 than those with negative serology (p = 0.0042). Intepretation Longer ART duration is key to HIV-1 proviral DNA reduction. Further understanding is needed of the effects of “immune-attenuation” through early HIV-1 exposure. Funding Wellcome Trust, National Institutes of Health, Medical Research Council.
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11
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Chan MK, Jull P. Accuracy of selected neurological clinical tests in diagnosing MRI-detectable forebrain lesion in dogs. Aust Vet J 2020; 98:499-503. [PMID: 32671818 DOI: 10.1111/avj.12997] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 06/05/2020] [Accepted: 06/22/2020] [Indexed: 01/23/2023]
Abstract
This retrospective case study aims to evaluate the accuracy of menace response, response to nasal stimulation and proprioceptive placing in diagnosing forebrain lesion in dogs. A total of 145 client-owned dogs investigated by magnetic resonance imaging study of the brain between December 2017 and June 2019 were evaluated. Seventy-one dogs with no magnetic resonance imaging-detectable intracranial and significant cerebrospinal fluid abnormality or recent history of seizure (<48 h) served as controls. Binary regression analysis was performed to determine the sensitivity, specificity and likelihood ratios of each selected test. Older age at presentation was a significant risk factor for the presence of a forebrain lesion. Menace (62.5%) and proprioceptive deficits (40.5%) were common findings in all dogs. They were also significantly associated with the presence of forebrain abnormality. Moreover, they were more sensitive (77.3% and 82.2%, respectively) and specific (50.0% and 62.5%, respectively) when applied to dogs aged 6 years or older. Nonetheless, all of these tests' likelihood ratios, and thus reliability are poor. These neurological tests are commonly employed for diagnosing forebrain disease in dogs, yet are not highly accurate in diagnosing forebrain abnormality. Clinicians should interpret these clinical test results along with the patient history when designing a diagnostic plan.
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Affiliation(s)
- M K Chan
- The VSCAN, Ottawa, Ontario, Canada
| | - P Jull
- The VSCAN, Ottawa, Ontario, Canada
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12
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Chan MK, Toribio JA, Podadera JM, Child G. Incidence, cause, outcome and possible risk factors associated with facial nerve paralysis in dogs in a Sydney population (2001-2016): a retrospective study. Aust Vet J 2019; 98:140-147. [PMID: 31867719 DOI: 10.1111/avj.12906] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 11/10/2019] [Accepted: 11/15/2019] [Indexed: 12/01/2022]
Abstract
OBJECTIVE This study aims to assess the incidence and causes of facial nerve paralysis (FNP) in dogs in the Sydney region. Its outcome and possible risk factors are investigated to prognosticate and aid design of diagnostic and treatment plans. DESIGN Retrospective case study. METHODS Client-owned dogs presented to the University Veterinary Teaching Hospital, Sydney (UVTHS), between 2001 and 2016 with FNP were included (n = 122). The incidence of each cause of FNP was investigated. A reference population of noncases seen at the UVTHS during the same time period was used to study the association between idiopathic facial nerve paralysis (IFNP) and gender, age and breed. RESULTS IFNP (29.5%) was the most common diagnosis. Male dogs (odds ratio [OR], 2.3) had increased odds of IFNP compared with female dogs. Age was a significant risk factor for both the occurrence of FNP and IFNP. There was higher occurrence of IFNP among middle-aged dogs (5-13 years) and reduced risk in juvenile dogs (less than 2 years). Cavalier King Charles Spaniels were over-represented for FNP (OR, 6.9) and IFNP (OR, 17.5). For IFNP, 6 of 16 dogs with known follow-up showed definitive resolution within 3 years of diagnosis. Concurrent vestibular signs were common in dogs with middle/inner ear abnormality and intracranial disease; and were also seen in 50% of dogs with IFNP. CONCLUSION The results of this study demonstrate statistical predilections in age, gender and breed for IFNP. Guarded prognosis for recovery should be given to dogs diagnosed with IFNP and supportive management instigated.
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Affiliation(s)
- M K Chan
- Sydney School of Veterinary Science, The University of Sydney, New South Wales, Australia
| | - J-Alml Toribio
- Sydney School of Veterinary Science, The University of Sydney, New South Wales, Australia
| | - J M Podadera
- Sydney School of Veterinary Science, The University of Sydney, New South Wales, Australia
| | - G Child
- Sydney School of Veterinary Science, The University of Sydney, New South Wales, Australia
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Tsang KH, Chan WSW, Shiu CK, Lee JCY, Chan MK. Magnetic Resonance Imaging of Hypertrophic Cardiomyopathy. Hong Kong J Radiol 2018. [DOI: 10.12809/hkjr1815336] [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: 11/05/2022] Open
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14
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Lee JCY, Tsang KH, Cheuk W, Chan MK. Positron-emission Tomography–Computed Tomography for Detection of Primary Pericardial Lymphoma. Hong Kong J Radiol 2018. [DOI: 10.12809/hkjr1616405] [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: 11/05/2022] Open
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15
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Fung HS, Chiu JLF, Shu SJ, Chan MK, Lai AKH, Wong WK, Chan SCH. A Man with Head Injury. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490790801500208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Head injury is common and can be associated with significant morbidity and mortality. We report a 71-year-old man with typical imaging findings of depressed skull fracture on plain film and computed tomography with images in multi-planar reformat and 3-dimensional volume rendering technique, followed by a brief review of the literature.
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Chan CYH, Tsang KWK, Lai KC, Chan MK. Dual-energy Computed Tomography for Diagnosis of Gouty Tophus of Tibia with Pathological Fracture Simulating Malignancy. Hong Kong J Radiol 2017. [DOI: 10.12809/hkjr1715374] [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: 11/05/2022] Open
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17
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Lee JCY, Shiu CK, Lai KC, Chan MK. Metal Artefact Reduction for Orthopaedic Devices Using Monoenergetic Extrapolation from Dual-energy Computed Tomography. Hong Kong J Radiol 2017. [DOI: 10.12809/hkjr1716423] [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: 11/05/2022] Open
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18
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Lee ACW, Tse KS, Lai KC, Chan MK, Tsang WK, Shiu CK, Cheng SS, Tang KW. Bone Surface Tumours and Tumour-like Conditions. Hong Kong J Radiol 2017. [DOI: 10.12809/hkjr1716433] [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: 11/05/2022] Open
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19
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Chan MK, Tang Y, Dorow CJ, Jeong J, Mangin-Thro L, Veit MJ, Ge Y, Abernathy DL, Sidis Y, Bourges P, Greven M. Hourglass Dispersion and Resonance of Magnetic Excitations in the Superconducting State of the Single-Layer Cuprate HgBa_{2}CuO_{4+δ} Near Optimal Doping. Phys Rev Lett 2016; 117:277002. [PMID: 28084762 DOI: 10.1103/physrevlett.117.277002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Indexed: 06/06/2023]
Abstract
We use neutron scattering to study magnetic excitations near the antiferromagnetic wave vector in the underdoped single-layer cuprate HgBa_{2}CuO_{4+δ} (superconducting transition temperature T_{c}≈88 K, pseudogap temperature T^{*}≈220 K). The response is distinctly enhanced below T^{*} and exhibits a Y-shaped dispersion in the pseudogap state, whereas the superconducting state features an X-shaped (hourglass) dispersion and a further resonancelike enhancement. A large spin gap of about 40 meV is observed in both states. This phenomenology is reminiscent of that exhibited by bilayer cuprates. The resonance spectral weight, irrespective of doping and compound, scales linearly with the putative binding energy of a spin exciton described by an itinerant-spin formalism.
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Affiliation(s)
- M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
- Pulsed Field Facility, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Y Tang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - J Jeong
- Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
| | - L Mangin-Thro
- Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Ge
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - D L Abernathy
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y Sidis
- Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
| | - P Bourges
- Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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20
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Chan MK, Cooper JD, Bot M, Birkenhager TK, Bergink V, Drexhage HA, Steiner J, Rothermundt M, Penninx BWJH, Bahn S. Blood-based immune-endocrine biomarkers of treatment response in depression. J Psychiatr Res 2016; 83:249-259. [PMID: 27693950 DOI: 10.1016/j.jpsychires.2016.08.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [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] [Received: 06/23/2016] [Revised: 08/21/2016] [Accepted: 08/29/2016] [Indexed: 10/21/2022]
Abstract
Antidepressant treatment for major depressive disorder remains suboptimal with response rates of just over 50%. Although treatment guidelines, algorithms and clinical keys are available to assist the clinician, the process of finding an effective pharmacotherapy to maximise benefit for the individual patient is largely by "trial and error" and remains challenging. This highlights a clear need to identify biomarkers of treatment response to help guide personalised treatment strategies. We have carried out the largest multiplex immunoassay based longitudinal study to date, examining up to 258 serum markers involved in immune, endocrine and metabolic processes as potential biomarkers associated with treatment response in 332 depression patients recruited from four independent clinical centres. We demonstrated for the first time that circulating Apolipoprotein A-IV, Endoglin, Intercellular Adhesion Molecule 1, Tissue Inhibitor of Metalloproteinases 1, Plasminogen Activator Inhibitor 1, Thrombopoietin, Complement C3, Hepatocyte Growth Factor and Insulin-like Growth Factor-Binding Protein 2 were associated with response to different antidepressants. In addition, we showed that specific sets of immune-endocrine proteins were associated with response to Venlafaxine (serotonin-norepinephrine reuptake inhibitor), Imipramine (tricyclic antidepressant) and other antidepressant drugs. However, we were not able to reproduce the literature findings on BDNF and TNF-α, two of the most commonly reported candidate treatment response markers. Despite the need for extensive validation studies, our preliminary findings suggest that a pre-treatment immune-endocrine profile may help to determine a patient's likelihood to respond to specific antidepressant and/or alternative treatments such as anti-inflammatory drugs, providing hope for future personalised treatment approaches.
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Affiliation(s)
- Man K Chan
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
| | - Jason D Cooper
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
| | - Mariska Bot
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - Tom K Birkenhager
- Department of Psychiatry and Immunology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Veerle Bergink
- Department of Psychiatry and Immunology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Hemmo A Drexhage
- Department of Psychiatry and Immunology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Johann Steiner
- Department of Psychiatry, University of Magdeburg, Germany
| | - Matthias Rothermundt
- Department of Psychiatry, University of Muenster, Germany and Evangelisches Klinikum Niederrhein, Oberhausen, Germany
| | - Brenda W J H Penninx
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - Sabine Bahn
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
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Ruland T, Chan MK, Stocki P, Grosse L, Rothermundt M, Cooper JD, Arolt V, Bahn S. Molecular serum signature of treatment resistant depression. Psychopharmacology (Berl) 2016; 233:3051-9. [PMID: 27325393 DOI: 10.1007/s00213-016-4348-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 06/04/2016] [Indexed: 01/24/2023]
Abstract
RATIONALE A substantial number of patients suffering from major depressive disorder (MDD) do not respond to multiple trials of anti-depressants, develop a chronic course of disease and become treatment resistant. Most of the studies investigating molecular changes in treatment-resistant depression (TRD) have only examined a limited number of molecules and genes. Consequently, biomarkers associated with TRD are still lacking. OBJECTIVES This study aimed to use recently advanced high-throughput proteomic platforms to identify peripheral biomarkers of TRD defined by two staging models, the Thase and Rush staging model (TRM) and the Maudsley Staging Model (MSM). METHODS Serum collected from an inpatient cohort of 65 individuals suffering from MDD was analysed using two different mass spectrometric-based platforms, label-free liquid chromatography mass spectrometry (LC-MS(E)) and selective reaction monitoring (SRM), as well as a multiplex bead based assay. RESULTS In the LC-MS(E) analysis, proteins involved in the acute phase response and complement activation and coagulation were significantly different between the staging groups in both models. In the multiplex bead-based assay analysis TNF-α levels (log(odds) = -4.95, p = 0.045) were significantly different in the TRM comparison. Using SRM, significant changes of three apolipoproteins A-I (β = 0.029, p = 0.035), M (β = -0.017, p = 0.009) and F (β = -0.031, p = 0.024) were associated with the TRM but not the MSM. CONCLUSION Overall, our findings suggest that proteins, which are involved in immune and complement activation, may represent potential biomarkers that could be used by clinicians to identify high-risk patients. Nevertheless, given that the molecular changes between the staging groups were subtle, the results need to be interpreted cautiously.
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Affiliation(s)
- Tillmann Ruland
- Mood and Anxiety Disorders Research Unit, Department of Psychiatry and Psychotherapy, University of Muenster, Muenster, Germany. .,Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK.
| | - Man K Chan
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Pawel Stocki
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Laura Grosse
- Mood and Anxiety Disorders Research Unit, Department of Psychiatry and Psychotherapy, University of Muenster, Muenster, Germany.,Radiology Morphological Solutions, Rotterdam, The Netherlands
| | - Matthias Rothermundt
- Mood and Anxiety Disorders Research Unit, Department of Psychiatry and Psychotherapy, University of Muenster, Muenster, Germany
| | - Jason D Cooper
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Volker Arolt
- Mood and Anxiety Disorders Research Unit, Department of Psychiatry and Psychotherapy, University of Muenster, Muenster, Germany
| | - Sabine Bahn
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
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Tsang KH, Chan WSW, Chan MK, Lai KC, Chan ACL. Synovial Sarcoma: Epidemiology, Prognosis, and Imaging in a Tertiary Referral Centre. Hong Kong J Radiol 2016. [DOI: 10.12809/hkjr1615298] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Gottschalk MG, Cooper JD, Chan MK, Bot M, Penninx BWJH, Bahn S. Serum biomarkers predictive of depressive episodes in panic disorder. J Psychiatr Res 2016; 73:53-62. [PMID: 26687614 DOI: 10.1016/j.jpsychires.2015.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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] [Received: 08/05/2015] [Revised: 11/13/2015] [Accepted: 11/20/2015] [Indexed: 01/30/2023]
Abstract
Panic disorder with or without comorbid agoraphobia (PD/PDA) has been linked to an increased risk to develop subsequent depressive episodes, yet the underlying pathophysiology of these disorders remains poorly understood. We aimed to identify a biomarker panel predictive for the development of a depressive disorder (major depressive disorder and/or dysthymia) within a 2-year-follow-up period. Blood serum concentrations of 165 analytes were evaluated in 120 PD/PDA patients without depressive disorder baseline diagnosis (6-month-recency) in the Netherlands Study of Depression and Anxiety (NESDA). We assessed the predictive performance of serum biomarkers, clinical, and self-report variables using receiver operating characteristics curves (ROC) and the area under the ROC curve (AUC). False-discovery-rate corrected logistic regression model selection of serum analytes and covariates identified an optimal predictive panel comprised of tetranectin and creatine kinase MB along with patient gender and scores from the Inventory of Depressive Symptomatology (IDS) rating scale. Combined, an AUC of 0.87 was reached for identifying the PD/PDA patients who developed a depressive disorder within 2 years (n = 44). The addition of biomarkers represented a significant (p = 0.010) improvement over using gender and IDS alone as predictors (AUC = 0.78). For the first time, we report on a combination of biological serum markers, clinical variables and self-report inventories that can detect PD/PDA patients at increased risk of developing subsequent depressive disorders with good predictive performance in a naturalistic cohort design. After an independent validation our proposed biomarkers could prove useful in the detection of at-risk PD/PDA patients, allowing for early therapeutic interventions and improving clinical outcome.
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Affiliation(s)
- M G Gottschalk
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - J D Cooper
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - M K Chan
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - M Bot
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - B W J H Penninx
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands.
| | - S Bahn
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK.
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Chan MK, Cooper JD, Bot M, Steiner J, Penninx BWJH, Bahn S. Identification of an Immune-Neuroendocrine Biomarker Panel for Detection of Depression: A Joint Effects Statistical Approach. Neuroendocrinology 2016; 103:693-710. [PMID: 26580065 DOI: 10.1159/000442208] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/05/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Less than half of depression patients are correctly diagnosed within the primary care setting. Previous proteomic studies have identified numerous immune and neuroendocrine changes in patients. However, few studies have considered the joint effects of biological molecules and their diagnostic potential. Our aim was to develop and validate a diagnostic serum biomarker panel identified through joint effects analysis of multiplex immunoassay profiling data from 1,007 clinical samples. METHODS In stage 1, we conducted a meta-analysis of two independent cohorts of 78 first-/recent-onset drug-naive/drug-free depression patients and 156 controls and applied the 10-fold cross-validation with least absolute shrinkage and selection operator regression to identify an optimal diagnostic prediction model (biomarker panel). In stage 2, we tested the discriminatory performance of this biomarker panel using the naturalistic Netherlands Study of Depression and Anxiety (NESDA) cohort of 468 depression patients and 305 controls. RESULTS An optimal panel of 33 immune-neuroendocrine biomarkers and gender was selected in the meta-analysis. Testing this biomarker-gender panel using the NESDA cohort resulted in a moderate to good performance to differentiate patients from controls (0.69 < AUC < 0.86), particularly the first-episode patients free of chronic non-psychiatric diseases or medications and following incorporation of sociodemographic covariates (0.76 < AUC < 0.92). CONCLUSION Despite the need for additional validation studies, we demonstrated that a blood-based biomarker-sociodemographic panel can detect depression in naturalistic healthcare settings with good discriminatory power. Further refinements of blood biomarker panels aiding in the diagnosis of depression may provide a cost-effective means to increase accuracy of clinical diagnosis within the primary care setting.
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Affiliation(s)
- Man K Chan
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
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Tsang KH, Cheung TY, Chan WSW, Chan MK. Primary Pericardial Osteosarcoma in an Elderly Patient. Hong Kong J Radiol 2015. [DOI: 10.12809/hkjr1515294] [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: 11/05/2022] Open
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Tsang KH, Chan WSW, Shiu CK, Chan MK. The safety and tolerability of adenosine as a pharmacological stressor in stress perfusion cardiac magnetic resonance imaging in the Chinese population. Hong Kong Med J 2015; 21:524-7. [PMID: 26273015 DOI: 10.12809/hkmj144437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To investigate the safety profile and effectiveness of adenosine as a pharmacological stressor in patients with known or suspected coronary artery disease who underwent cardiac magnetic resonance imaging perfusion study. SETTING Regional hospital, Hong Kong. PATIENTS All patients who underwent adenosine stress cardiac magnetic resonance imaging from May 2013 to August 2013 were prospectively interviewed during the scan. MAIN OUTCOME MEASURES Common side-effects of adenosine as well as any other discomfort experienced during the scan were recorded. Haemodynamic changes including systolic and diastolic blood pressure and pulse rate before and during adenosine administration were also recorded. RESULTS There were 98 consecutive patients with a mean (± standard deviation) age of 64.0 ± 11.4 years (range, 10-83 years) and mean body weight of 67.5 ± 12.0 kg. Male-to-female ratio was 2.5:1. Of the 98 patients interviewed, 62 (63.3%) experienced one or more adenosine-associated adverse effects. Chest discomfort was most frequently experienced (48.0%), followed by dyspnoea (29.6%) and headache (20.4%). No life-threatening event occurred. Following adenosine administration, a significant rise in pulse rate (75.1 ± 14.3 vs 93.2 ± 14.7 beats/min; P<0.01) and a significant drop in diastolic blood pressure (75.1 ± 13.3 vs 68.0 ± 13.9 mm Hg; P<0.01) were noted. There was a general decrease in systolic blood pressure, although no statistically significant difference was observed (144.9 ± 17.6 vs 143.1 ± 21.4 mm Hg; P=0.18). CONCLUSION Adenosine stress cardiac magnetic resonance perfusion study is safe and well tolerated in clinical practice.
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Affiliation(s)
- K H Tsang
- Department of Radiology and Imaging, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - Winnie S W Chan
- Department of Radiology and Imaging, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - C K Shiu
- Department of Radiology and Imaging, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - M K Chan
- Department of Radiology and Imaging, Queen Elizabeth Hospital, Jordan, Hong Kong
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Gottschalk MG, Cooper JD, Chan MK, Bot M, Penninx BWJH, Bahn S. Discovery of serum biomarkers predicting development of a subsequent depressive episode in social anxiety disorder. Brain Behav Immun 2015; 48:123-31. [PMID: 25929723 DOI: 10.1016/j.bbi.2015.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/10/2015] [Accepted: 04/21/2015] [Indexed: 01/04/2023] Open
Abstract
Although social anxiety disorder (SAD) is strongly associated with the subsequent development of a depressive disorder (major depressive disorder or dysthymia), no underlying biological risk factors are known. We aimed to identify biomarkers which predict depressive episodes in SAD patients over a 2-year follow-up period. One hundred sixty-five multiplexed immunoassay analytes were investigated in blood serum of 143 SAD patients without co-morbid depressive disorders, recruited within the Netherlands Study of Depression and Anxiety (NESDA). Predictive performance of identified biomarkers, clinical variables and self-report inventories was assessed using receiver operating characteristics curves (ROC) and represented by the area under the ROC curve (AUC). Stepwise logistic regression resulted in the selection of four serum analytes (AXL receptor tyrosine kinase, vascular cell adhesion molecule 1, vitronectin, collagen IV) and four additional variables (Inventory of Depressive Symptomatology, Beck Anxiety Inventory somatic subscale, depressive disorder lifetime diagnosis, BMI) as optimal set of patient parameters. When combined, an AUC of 0.86 was achieved for the identification of SAD individuals who later developed a depressive disorder. Throughout our analyses, biomarkers yielded superior discriminative performance compared to clinical variables and self-report inventories alone. We report the discovery of a serum marker panel with good predictive performance to identify SAD individuals prone to develop subsequent depressive episodes in a naturalistic cohort design. Furthermore, we emphasise the importance to combine biological markers, clinical variables and self-report inventories for disease course predictions in psychiatry. Following replication in independent cohorts, validated biomarkers could help to identify SAD patients at risk of developing a depressive disorder, thus facilitating early intervention.
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Affiliation(s)
- M G Gottschalk
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - J D Cooper
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - M K Chan
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK
| | - M Bot
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - B W J H Penninx
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands.
| | - S Bahn
- Department of Chemical Engineering and Biotechnology, Cambridge Centre for Neuropsychiatric Research, University of Cambridge, Cambridge, UK; Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands.
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Bot M, Chan MK, Jansen R, Lamers F, Vogelzangs N, Steiner J, Leweke FM, Rothermundt M, Cooper J, Bahn S, Penninx BWJH. Serum proteomic profiling of major depressive disorder. Transl Psychiatry 2015; 5:e599. [PMID: 26171980 PMCID: PMC5068719 DOI: 10.1038/tp.2015.88] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 03/11/2015] [Accepted: 05/21/2015] [Indexed: 12/17/2022] Open
Abstract
Much has still to be learned about the molecular mechanisms of depression. This study aims to gain insight into contributing mechanisms by identifying serum proteins related to major depressive disorder (MDD) in a large psychiatric cohort study. Our sample consisted of 1589 participants of the Netherlands Study of Depression and Anxiety, comprising 687 individuals with current MDD (cMDD), 482 individuals with remitted MDD (rMDD) and 420 controls. We studied the relationship between MDD status and the levels of 171 serum proteins detected on a multi-analyte profiling platform using adjusted linear regression models. Pooled analyses of two independent validation cohorts (totaling 78 MDD cases and 156 controls) was carried out to validate our top markers. Twenty-eight analytes differed significantly between cMDD cases and controls (P < 0.05), whereas 10 partly overlapping markers differed significantly between rMDD cases and controls. Antidepressant medication use and comorbid anxiety status did not substantially impact on these findings. Sixteen of the cMDD-related markers had been assayed in the pooled validation cohorts, of which seven were associated with MDD. The analytes prominently associated with cMDD related to diverse cell communication and signal transduction processes (pancreatic polypeptide, macrophage migration inhibitory factor, ENRAGE, interleukin-1 receptor antagonist and tenascin-C), immune response (growth-regulated alpha protein) and protein metabolism (von Willebrand factor). Several proteins were implicated in depression. Changes were more prominent in cMDD, suggesting that molecular alterations in serum are associated with acute depression symptomatology. These findings may help to establish serum-based biomarkers of depression and could improve our understanding of its pathophysiology.
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Affiliation(s)
- M Bot
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - M K Chan
- Department of Chemical Engineering and Biotechnology, Institute of Biotechnology, University of Cambridge, Cambridge, UK
| | - R Jansen
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - F Lamers
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - N Vogelzangs
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands
| | - J Steiner
- Department of Psychiatry, University of Magdeburg, Magdeburg, Germany
| | - F M Leweke
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - M Rothermundt
- Department of Psychiatry, University of Münster, Münster, Germany,Evangelisches Klinikum Niederrhein, Oberhausen, Germany
| | - J Cooper
- Department of Chemical Engineering and Biotechnology, Institute of Biotechnology, University of Cambridge, Cambridge, UK
| | - S Bahn
- Department of Chemical Engineering and Biotechnology, Institute of Biotechnology, University of Cambridge, Cambridge, UK,Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,Dr S Bahn, Department of Chemical Engineering and Biotechnology, Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK
| | - B W J H Penninx
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands,Dr BWJH Penninx, Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, VU University Medical Center, AJ Ernststraat 1187, 1081 HL Amsterdam, The Netherlands. E-mail: or
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Affiliation(s)
- M K Chan
- Department of Medicine, University of Hong Kong, Queen Mary Hospital
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31
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Tabis W, Li Y, Le Tacon M, Braicovich L, Kreyssig A, Minola M, Dellea G, Weschke E, Veit MJ, Ramazanoglu M, Goldman AI, Schmitt T, Ghiringhelli G, Barišić N, Chan MK, Dorow CJ, Yu G, Zhao X, Keimer B, Greven M. Charge order and its connection with Fermi-liquid charge transport in a pristine high-T(c) cuprate. Nat Commun 2014; 5:5875. [PMID: 25522689 DOI: 10.1038/ncomms6875] [Citation(s) in RCA: 236] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 11/17/2014] [Indexed: 11/09/2022] Open
Abstract
Electronic inhomogeneity appears to be an inherent characteristic of the enigmatic cuprate superconductors. Here we report the observation of charge-density-wave correlations in the model cuprate superconductor HgBa2CuO(4+δ) (T(c)=72 K) via bulk Cu L3-edge-resonant X-ray scattering. At the measured hole-doping level, both the short-range charge modulations and Fermi-liquid transport appear below the same temperature of about 200 K. Our result points to a unifying picture in which these two phenomena are preceded at the higher pseudogap temperature by q=0 magnetic order and the build-up of significant dynamic antiferromagnetic correlations. The magnitude of the charge modulation wave vector is consistent with the size of the electron pocket implied by quantum oscillation and Hall effect measurements for HgBa2CuO(4+δ) and with corresponding results for YBa2Cu3O(6+δ), which indicates that charge-density-wave correlations are universally responsible for the low-temperature quantum oscillation phenomenon.
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Affiliation(s)
- W Tabis
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Y Li
- 1] International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
| | - M Le Tacon
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - L Braicovich
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - A Kreyssig
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - M Minola
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - G Dellea
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - E Weschke
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M Ramazanoglu
- 1] Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA [2] Physics Engineering Department, ITU, Maslak 34469, Istanbul, Turkey
| | - A I Goldman
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - T Schmitt
- Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - G Ghiringhelli
- CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - N Barišić
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] Service de Physique de l'Etat Condensé, CEA-DSM-IRAMIS, F-91198 Gif-sur-Yvette, France [3] Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - G Yu
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - X Zhao
- 1] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - B Keimer
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Chan MK, Veit MJ, Dorow CJ, Ge Y, Li Y, Tabis W, Tang Y, Zhao X, Barišić N, Greven M. In-plane magnetoresistance obeys Kohler's rule in the pseudogap phase of cuprate superconductors. Phys Rev Lett 2014; 113:177005. [PMID: 25379934 DOI: 10.1103/physrevlett.113.177005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Indexed: 06/04/2023]
Abstract
We report in-plane resistivity (ρ) and transverse magnetoresistance (MR) measurements for underdoped HgBa(2)CuO(4+δ) (Hg1201). Contrary to the long-standing view that Kohler's rule is strongly violated in underdoped cuprates, we find that it is in fact satisfied in the pseudogap phase of Hg1201. The transverse MR shows a quadratic field dependence, δρ/ρ(0)=aH(2), with a(T)∝T(-4). In combination with the observed ρ∝T(2) dependence, this is consistent with a single Fermi-liquid quasiparticle scattering rate. We show that this behavior is typically masked in cuprates with lower structural symmetry or strong disorder effects.
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Affiliation(s)
- M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Ge
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Li
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - W Tabis
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
| | - Y Tang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - X Zhao
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - N Barišić
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and Service de Physique de l'Etat Condensé, CEA-DSM-IRAMIS, F 91198 Gif-sur-Yvette, France and Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Cilento F, Dal Conte S, Coslovich G, Peli S, Nembrini N, Mor S, Banfi F, Ferrini G, Eisaki H, Chan MK, Dorow CJ, Veit MJ, Greven M, van der Marel D, Comin R, Damascelli A, Rettig L, Bovensiepen U, Capone M, Giannetti C, Parmigiani F. Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates. Nat Commun 2014; 5:4353. [PMID: 25014895 PMCID: PMC4104437 DOI: 10.1038/ncomms5353] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 06/07/2014] [Indexed: 11/24/2022] Open
Abstract
A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to prepare a non-thermal distribution of excitations and capture novel properties that are hidden at equilibrium. Using a broadband (0.5–2 eV) probe, we are able to track the dynamics of the dielectric function and unveil an anomalous decrease in the scattering rate of the charge carriers in a pseudogap-like region of the temperature (T) and hole-doping (p) phase diagram. In this region, delimited by a well-defined T*neq(p) line, the photoexcitation process triggers the evolution of antinodal excitations from gapped (localized) to delocalized quasiparticles characterized by a longer lifetime. The novel concept of photo-enhanced antinodal conductivity is naturally explained within the single-band Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations. The pseudogap phase exhibited by the cuprates is almost as enigmatic as superconductivity in these materials itself. A time-resolved study performed by Cilento et al. suggests that this state can be photoexcited into a transient non-equilibrium state that is more conductive than the equilibrium state.
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Affiliation(s)
- F Cilento
- Elettra-Sincrotrone Trieste S.C.p.A., I-34149 Basovizza, Italy
| | - S Dal Conte
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] i-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [3]
| | - G Coslovich
- 1] Department of Physics, Università degli Studi di Trieste, I-34127 Trieste, Italy [2]
| | - S Peli
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] Department of Physics, Università degli Studi di Milano, I-20133 Milano, Italy
| | - N Nembrini
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] Department of Physics, Università degli Studi di Milano, I-20133 Milano, Italy
| | - S Mor
- Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy
| | - F Banfi
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] i-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy
| | - G Ferrini
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] i-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy
| | - H Eisaki
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - D van der Marel
- Département de Physique de la Matière Condensée, Université de Genève, CH1211 Genève, Switzerland
| | - R Comin
- 1] Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 [2] Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
| | - A Damascelli
- 1] Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 [2] Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
| | - L Rettig
- 1] Fakultaet fuer Physik and Zentrum für Nanointegration (CENIDE), Universitaet Duisburg-Essen, 47048 Duisburg, Germany [2]
| | - U Bovensiepen
- Fakultaet fuer Physik and Zentrum für Nanointegration (CENIDE), Universitaet Duisburg-Essen, 47048 Duisburg, Germany
| | - M Capone
- CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea 265, 34136 Trieste, Italy
| | - C Giannetti
- 1] Department of Physics, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy [2] i-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy
| | - F Parmigiani
- 1] Elettra-Sincrotrone Trieste S.C.p.A., I-34149 Basovizza, Italy [2] Department of Physics, Università degli Studi di Trieste, I-34127 Trieste, Italy
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Lau TK, Cheung SW, Lo PSS, Pursley AN, Chan MK, Jiang F, Zhang H, Wang W, Jong LFJ, Yuen OKC, Chan HYC, Chan WSK, Choy KW. Non-invasive prenatal testing for fetal chromosomal abnormalities by low-coverage whole-genome sequencing of maternal plasma DNA: review of 1982 consecutive cases in a single center. Ultrasound Obstet Gynecol 2014; 43:254-264. [PMID: 24339153 DOI: 10.1002/uog.13277] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Revised: 12/06/2013] [Accepted: 12/10/2013] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To review the performance of non-invasive prenatal testing (NIPT) by low-coverage whole-genome sequencing of maternal plasma DNA at a single center. METHODS The NIPT result and pregnancy outcome of 1982 consecutive cases were reviewed. NIPT was based on low coverage (0.1×) whole-genome sequencing of maternal plasma DNA. All subjects were contacted for pregnancy and fetal outcome. RESULTS Of the 1982 NIPT tests, a repeat blood sample was required in 23 (1.16%). In one case, a conclusive report could not be issued, probably because of an abnormal vanished twin fetus. NIPT was positive for common trisomies in 29 cases (23 were trisomy 21, four were trisomy 18 and two were trisomy 13); all were confirmed by prenatal karyotyping (specificity=100%). In addition, 11 cases were positive for sex-chromosomal abnormalities (SCA), and nine cases were positive for other aneuploidies or deletion/duplication. Fourteen of these 20 subjects agreed to undergo further investigations, and the abnormality was found to be of fetal origin in seven, confined placental mosaicism (CPM) in four, of maternal origin in two and not confirmed in one. Overall, 85.7% of the NIPT-suspected SCA were of fetal origin, and 66.7% of the other abnormalities were caused by CPM. Two of the six cases suspected or confirmed to have CPM were complicated by early-onset growth restriction requiring delivery before 34 weeks. Fetal outcome of the NIPT-negative cases was ascertained in 1645 (85.15%). Three chromosomal abnormalities were not detected by NIPT, including one case each of a balanced translocation, unbalanced translocation and triploidy. There were no known false negatives involving the common trisomies (sensitivity=100%). CONCLUSIONS Low-coverage whole-genome sequencing of maternal plasma DNA was highly accurate in detecting common trisomies. It also enabled the detection of other aneuploidies and structural chromosomal abnormalities with high positive predictive value.
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Affiliation(s)
- T K Lau
- Fetal Medicine Centre, Paramount Medical Centre, Hong Kong, China
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Guest PC, Chan MK, Gottschalk MG, Bahn S. The use of proteomic biomarkers for improved diagnosis and stratification of schizophrenia patients. Biomark Med 2014; 8:15-27. [DOI: 10.2217/bmm.13.83] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Schizophrenia is characterized by a wide spectrum of clinical manifestations, including strong effects on mood and behavior. Patients can also suffer from serious comorbidities including immune system or metabolic abnormalities. Recent advances using proteomic profiling approaches have increased our understanding of these molecular effects and have laid the groundwork for unraveling the heterogeneity of this broadly defined disease. These findings could lead to improved diagnosis and stratification of patients through identification of biochemically different disease subtypes and personalized medicine approaches. The inclusion of molecular signatures in psychiatry will be an important leap forward in providing more effective treatment of patients suffering from this debilitating disorder.
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Affiliation(s)
- Paul C Guest
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | - Man K Chan
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | - Michael G Gottschalk
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | - Sabine Bahn
- Department of Neuroscience, Erasmus Medical Centre, Rotterdam, The Netherlands
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Mounce AM, Oh S, Lee JA, Halperin WP, Reyes AP, Kuhns PL, Chan MK, Dorow C, Ji L, Xia D, Zhao X, Greven M. Absence of static loop-current magnetism at the apical oxygen site in HgBa2CuO4+δ from NMR. Phys Rev Lett 2013; 111:187003. [PMID: 24237553 DOI: 10.1103/physrevlett.111.187003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Indexed: 06/02/2023]
Abstract
The simple structure of HgBa(2)CuO(4+δ) (Hg1201) is ideal among cuprates for study of the pseudogap phase as a broken symmetry state. We have performed (17)O nuclear magnetic resonance on an underdoped Hg1201 crystal with a transition temperature of 74 K to look for circulating loop currents proposed theoretically and inferred from neutron scattering. The narrow spectra preclude static local fields in the pseudogap phase at the apical site, suggesting that the moments observed with neutrons are fluctuating. The nuclear magnetic resonance frequency shifts are consistent with a dipolar field from the Cu(2+) site.
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Affiliation(s)
- A M Mounce
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
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Li Y, Le Tacon M, Matiks Y, Boris AV, Loew T, Lin CT, Chen L, Chan MK, Dorow C, Ji L, Barišić N, Zhao X, Greven M, Keimer B. Doping-dependent photon scattering resonance in the model high-temperature superconductor HgBa2CuO4+δ revealed by Raman scattering and optical ellipsometry. Phys Rev Lett 2013; 111:187001. [PMID: 24237551 DOI: 10.1103/physrevlett.111.187001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Indexed: 06/02/2023]
Abstract
We study the model high-temperature superconductor HgBa(2)CuO(4+δ) with electronic Raman scattering and optical ellipsometry over a wide doping range. The dependence of the resonant Raman cross section on the incident photon energy changes drastically as a function of doping, in a manner that corresponds to a rearrangement of the interband optical transitions seen with ellipsometry. This doping-dependent Raman resonance allows us to reconcile the apparent discrepancy between Raman and x-ray detection of magnetic fluctuations in superconducting cuprates. Intriguingly, the strongest variation occurs across the doping level where the antinodal superconducting gap appears to reach its maximum.
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Affiliation(s)
- Yuan Li
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China and Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
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38
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Choi H, Lau TK, Jiang FM, Chan MK, Zhang HY, Lo PSS, Chen F, Zhang L, Wang W. Fetal aneuploidy screening by maternal plasma DNA sequencing: 'false positive' due to confined placental mosaicism. Prenat Diagn 2012. [PMID: 23192749 DOI: 10.1002/pd.4024] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Pasic MD, Colantonio DA, Chan MK, Venner AA, Brinc D, Adeli K. Influence of fasting and sample collection time on 38 biochemical markers in healthy children: a CALIPER substudy. Clin Biochem 2012; 45:1125-30. [PMID: 22820439 DOI: 10.1016/j.clinbiochem.2012.07.089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 07/05/2012] [Accepted: 07/08/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Fasting samples can be difficult to obtain in the pediatric setting, particularly in neonates. As part of the Canadian Laboratory Initiative on Pediatric Reference Intervals (CALIPER), we aimed to determine if there are differences in serum concentrations of pediatric biochemical markers measured at fasting, postprandial, and random time points throughout the day. DESIGN AND METHODS Blood was drawn from 27 healthy children and adolescents (aged 4-18) with informed consent at 4 time points: after overnight fast, mid-morning after breakfast, within 2h after lunch, and late afternoon. The effect of fasting on 38 chemistries was evaluated by paired, two-tailed student'st-tests. Analysis of the effect of time of day was done using paired, repeated-measures ANOVA. RESULTS Fasting significantly affected 22 analytes, with HDL cholesterol being the most highly affected. Values tended to decrease postprandially, except for five analytes, including triglycerides, which increased. By ANOVA, 28 chemistries significantly differed across times of day tested. CONCLUSIONS Fasting is necessary for analysis of certain chemistries in pediatric subjects. Pediatricians should consider diurnal factors when ordering non-fasting tests and interpreting test results.
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Affiliation(s)
- M D Pasic
- Clinical Biochemistry Division, Department of Pediatric Laboratory Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
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40
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Li Y, Le Tacon M, Bakr M, Terrade D, Manske D, Hackl R, Ji L, Chan MK, Barišić N, Zhao X, Greven M, Keimer B. Feedback effect on high-energy magnetic fluctuations in the model high-temperature superconductor HgBa2CuO(4+δ) observed by electronic Raman scattering. Phys Rev Lett 2012; 108:227003. [PMID: 23003643 DOI: 10.1103/physrevlett.108.227003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Indexed: 06/01/2023]
Abstract
We use electronic Raman scattering to study the model single-layer cuprate superconductor HgBa(2)CuO(4+δ). In an overdoped sample, we observe a pronounced amplitude enhancement of a high-energy peak related to two-magnon excitations in insulating cuprates upon cooling below the critical temperature T(c). This effect is accompanied by the appearance of the superconducting gap and a pairing peak above the gap in the Raman spectrum, and it can be understood as a hitherto-undetected feedback effect on the high-energy magnetic fluctuations due to the Cooper pairing interaction. This implies a direct involvement of the high-energy magnetic fluctuations in the pairing mechanism. All of these effects occur already above T(c) in two underdoped samples, demonstrating a related feedback mechanism associated with the pseudogap.
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Affiliation(s)
- Yuan Li
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany.
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Chan MK, Guest PC, Levin Y, Umrania Y, Schwarz E, Bahn S, Rahmoune H. Converging evidence of blood-based biomarkers for schizophrenia: an update. Int Rev Neurobiol 2011; 101:95-144. [PMID: 22050850 DOI: 10.1016/b978-0-12-387718-5.00005-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This chapter has carried out a review of the literature and combined this with the results of in-house studies to identify candidate blood-based biomarkers for schizophrenia and antipsychotic drug response. Literature searches retrieved 185 publications describing a total of 273 schizophrenia biomarkers identified in serum and/or plasma. Examination of seven in-house multicenter studies resulted in the identification of 137 serum/plasma biomarkers. Taken together, the findings suggested an ongoing immunological and inflammatory process in schizophrenia. This was accompanied by altered cortisol levels which suggested activated stress response and altered hypothalamic-pituitary-adrenal axis function in these patients. The authors conclude that such biomarkers may prove useful as additional parameters for characterizing specific immune and/or metabolic or hormonal subsystems in schizophrenia and might, therefore, facilitate the development of future patient stratification and personalized medicine strategies.
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Affiliation(s)
- Man K Chan
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
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Garlid ES, Hu QO, Chan MK, Palmstrøm CJ, Crowell PA. Electrical measurement of the direct spin hall effect in Fe/InxGa(1-x)As heterostructures. Phys Rev Lett 2010; 105:156602. [PMID: 21230922 DOI: 10.1103/physrevlett.105.156602] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Indexed: 05/30/2023]
Abstract
We report on an all-electrical measurement of the spin Hall effect in epitaxial Fe/InxGa(1-x)As heterostructures with n-type (Si) channel doping and highly doped Schottky tunnel barriers. A transverse spin current generated by an ordinary charge current flowing in the InxGa(1-x)As is detected by measuring the spin accumulation at the edges of the channel. The spin accumulation is identified through the observation of a Hanle effect in the voltage measured by pairs of ferromagnetic Hall contacts. We investigate the bias and temperature dependence of the resulting Hanle signal and determine the skew and side-jump contributions to the total spin Hall conductivity.
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Affiliation(s)
- E S Garlid
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Rampakakis E, Di Paola D, Chan MK, Zannis-Hadjopoulos M. Dynamic changes in chromatin structure through post-translational modifications of histone H3 during replication origin activation. J Cell Biochem 2009; 108:400-7. [PMID: 19585526 DOI: 10.1002/jcb.22266] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Genome duplication relies on the timely activation of multiple replication origins throughout the genome during S phase. Each origin is marked by the assembly of a multiprotein pre-replication complex (pre-RC) and the recruitment of the replicative machinery, which can gain access to replication origins on the DNA through the barrier of specific chromatin structures. Inheritance of the genetic information is further accompanied by maintenance and inheritance of the epigenetic marks, which are accomplished by the activity of histone and DNA modifying enzymes traveling with the replisome. Here, we studied the changes in the chromatin structure at the loci of three replication origins, the early activated human lamin B2 (LB2) and monkey Ors8 (mOrs8) origins and the late-activated human homologue of the latter (hOrs8), during their activation, by measuring the abundance of post-translationally modified histone H3. The data show that dynamic changes in the levels of acetylated, methylated and phosphorylated histone H3 occur during the initiation of DNA replication at these three origin loci, which differ between early- and late-firing origins as well as between human- and monkey-derived cell lines. These results suggest that specific histone modifications are associated with origin firing, temporal activation and replication fork progression and underscore the importance of species specificity.
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Affiliation(s)
- E Rampakakis
- Rosalind and Morris Goodman Cancer Center, Department of Biochemistry, McGill University, Montreal, Quebec, Canada H3A 1A3
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Ma D, Chan MK, Lockstone HE, Pietsch SR, Jones DNC, Cilia J, Hill MD, Robbins MJ, Benzel IM, Umrania Y, Guest PC, Levin Y, Maycox PR, Bahn S. Antipsychotic Treatment Alters Protein Expression Associated with Presynaptic Function and Nervous System Development in Rat Frontal Cortex. J Proteome Res 2009; 8:3284-97. [DOI: 10.1021/pr800983p] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Dan Ma
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Man K. Chan
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Helen E. Lockstone
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Sandra R. Pietsch
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Declan N. C. Jones
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Jackie Cilia
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Mark D. Hill
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Melanie J. Robbins
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Isabel M. Benzel
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Yagnesh Umrania
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Paul C. Guest
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Yishai Levin
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Peter R. Maycox
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
| | - Sabine Bahn
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, U.K., and Psychiatry CEDD, New Frontiers Science Park, GlaxoSmithKline, Third Avenue, Harlow, CM19 5AW, U.K
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Di Daniel E, Glover CP, Grot E, Chan MK, Sanderson TH, White JH, Ellis CL, Gallagher KT, Uney J, Thomas J, Maycox PR, Mudge AW. Prolyl oligopeptidase binds to GAP-43 and functions without its peptidase activity. Mol Cell Neurosci 2009; 41:373-82. [PMID: 19332125 DOI: 10.1016/j.mcn.2009.03.003] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 03/10/2009] [Accepted: 03/13/2009] [Indexed: 12/01/2022] Open
Abstract
Inhibitors of the enzyme prolyl oligopeptidase (PO) improve performance in rodent learning and memory tasks. PO inhibitors are also implicated in the action of drugs used to treat bipolar disorder: they reverse the effects of three mood stabilizers on the dynamic behaviour of neuronal growth cones. PO cleaves prolyl bonds in short peptides, suggesting that neuropeptides might be its brain substrates. PO is located in the cytosol, however, where it would not contact neuropeptides. Here, we show that mice with a targeted PO null-mutation have altered growth cone dynamics. The wild-type phenotype is restored by PO cDNAs encoding either native or a catalytically-dead enzyme. In addition, we show that PO binds to the growth-associated protein GAP-43, which is a key regulator of synaptic plasticity. Taken together, our results show that peptidase activity is not required for PO function in neurons and suggest that PO instead acts by binding to cytosolic proteins that control growth cone and synaptic function.
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Affiliation(s)
- Elena Di Daniel
- Psychiatry Discovery Technology Group, GlaxoSmithKline Pharmaceuticals, Harlow, Essex, UK
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Fung HS, Lau S, Chan MK, Tang KW, Cheung YL, Chan SCH. Persistent sciatic artery complicated by aneurysm formation and thrombosis. Hong Kong Med J 2008; 14:492-494. [PMID: 19060351] [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: 05/27/2023] Open
Abstract
A persistent sciatic artery is a rare embryological anomaly. We report a case of a persistent sciatic artery with aneurysm formation and thrombosis in a patient with rheumatoid arthritis/systemic lupus erythematosus overlap syndrome and Raynaud's phenomenon. The diagnosis and complete, accurate evaluation of the arterial anatomy of the lower limb were achieved using computed tomographic angiography.
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Affiliation(s)
- H S Fung
- Department of Radiology and Imaging, Queen Elizabeth Hospital, Hong Kong.
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Lee S, Chan JWM, Chan SCH, Chan YH, Kwan TL, Chan MK, Ng CK, Lee MP, Law WL, Mok TYW. Bronchial artery embolisation can be equally safe and effective in the management of chronic recurrent haemoptysis. Hong Kong Med J 2008; 14:14-20. [PMID: 18239238] [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: 05/25/2023] Open
Abstract
OBJECTIVE To examine the efficacy and safety of bronchial artery embolisation in patients with acute major haemoptysis and those with chronic recurrent haemoptysis. DESIGN Retrospective review of clinical records. SETTING Regional hospital, Hong Kong. PATIENTS Clinical records of 70 consecutive patients who had undergone bronchial artery embolisation in Queen Elizabeth Hospital from 1998 to 2003 were reviewed. Altogether 74 bronchial artery embolisation procedures were attempted, 46 (62%) for acute major haemoptysis, and 28 (38%) for chronic recurrent bleeding. Follow-up data were available for 32 patients. MAIN OUTCOME MEASURES After bronchial artery embolisation, the Kaplan-Meier method and log-rank tests were used to compare the probability of recurrence in the two patient categories. RESULTS Overall immediate control was attained following 99% of the procedures, with a complication rate of 13%; all complications were mild and self-limiting. For the 32 patients (19 having acute major haemoptysis and 13 having chronic recurrent bleeding) with follow-up data available, the overall recurrence rate was 36% (26% in the acute and 47% in chronic group). No statistically significant difference in recurrence probability between the two groups was observed (P=0.24). Presence of active pulmonary tuberculosis was associated with increased risk of recurrence (P=0.005). CONCLUSION Bronchial artery embolisation was noted to be effective and safe in both acute major and chronic recurrent haemoptysis.
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Affiliation(s)
- Samuel Lee
- Department of Medicine, Queen Elizabeth Hospital, 30 Gascoigne Road, Kowloon, Hong Kong.
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Engelhardt T, Chan MK, McCheyne AJ, Karsli C, Luginbuehl I, Bissonnette B. The effect of varying continuous propofol infusions on plasma cyclic guanosine 3',5'-monophosphate concentrations in anesthetized children. Anesth Analg 2007; 105:616-9. [PMID: 17717213 DOI: 10.1213/01.ane.0000275188.56157.a2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND The glutamate-nitric oxide-cyclic guanosine 3',5'-monophosphate (cGMP) pathway is potentially an effective target for general anesthetics. Plasma cGMP concentrations are reduced after an increase in predicted plasma propofol concentrations during sedation in healthy adult volunteers. We hypothesized that an increase in measured plasma propofol concentration leads to a reduction in plasma cGMP in anesthetized children. METHODS Eighteen healthy children aged 46.8 (+/-19.6) mo, requiring general anesthesia for lower body surgical procedures were enrolled. After inhaled induction, tracheal intubation and initiation of intermittent positive pressure ventilation, caudal epidural analgesia was performed. Anesthesia was maintained using a continuous propofol infusion adapted from a previously published regimen to achieve predicted propofol plasma concentration of 6, 3, and 1.5 microg/mL after 30, 50, and 70 min, respectively. Samples for propofol and cGMP plasma concentrations were collected and analyzed using high-performance liquid chromatography and an enzyme immunoassay system. RESULTS The plasma cGMP concentrations varied significantly (median [range]) 19.2 [11.8-23.5], 21.3 [14.6-30.8], and 24.9 [15.7-37.8] nmol/L among each predicted plasma propofol concentration, P < 0.0001. The correlation coefficient (r) was -0.62. CONCLUSIONS This study demonstrates that an increase in plasma propofol concentration leads to a decrease in plasma cGMP in healthy children, and could serve as a biochemical marker for depth of propofol anesthesia in children.
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Affiliation(s)
- Thomas Engelhardt
- Department of Anaesthesia and Laboratory Medicine, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.
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Mak HLJ, Kwok PCH, Chau HHL, Chan MK, Chan SCH, Chan SCS. Uterine fibroid embolisation in Chinese women: medium-term results. Hong Kong Med J 2006; 12:361-7. [PMID: 17028356] [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: 05/12/2023] Open
Abstract
OBJECTIVE To evaluate the medium-term results of uterine fibroid embolisation in Chinese women with symptomatic uterine fibroids. DESIGN Prospective case series study. SETTING Gynaecology and Interventional Radiology units in a public hospital, Hong Kong. PATIENTS Patients with symptomatic fibroids who underwent uterine fibroid embolisation in Queen Elizabeth Hospital from October 1998 to June 2004. RESULTS Fifty women (mean age, 42.9 years; median follow-up period, 27.5 months) were recruited. Most (82%) had menorrhagia as the chief presenting symptom. Embolisation was successful in 49 (98%) women. Complications occurred in 12 (24%) patients, but were all self-limiting. Significant decrease in the median clinical uterine size (14 weeks vs 10 weeks) and median volume of the largest fibroid on magnetic resonance imaging (157.9 mL vs 45 mL) were observed during the first year. The reduction seemed to be maintained till the last follow-up. Menorrhagia improved in 34 (84%) patients, dysmenorrhoea in 28 (88%), pelvic pain in 18 (82%) and abdominal mass in 15 (83%). Poor response was found for urinary symptoms (29% improvement). Eight (16%) patients underwent hysterectomies after uterine fibroid embolisation. On logistic regression analysis, the only significant predictive factor for symptomatic improvement was fibroid volume reduction at 6 months (P=0.03). CONCLUSION Uterine fibroid embolisation is an effective uterine-preserving therapy in patients with symptomatic fibroids; overall symptomatic improvement was estimated as 80%. Uterine or fibroid size reduction correlated well with clinical outcome. The impact of uterine fibroid embolisation on young women wishing to conceive is yet to be determined.
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Affiliation(s)
- H L J Mak
- Department of Obstetrics and Gynaecology, Queen Elizabeth Hospital, 30 Gascoigne Road, Kowloon, Hong Kong.
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Yip PSC, Lam YL, Chan MK, Shu JSJ, Lai KC, So YC. Computed tomography-guided percutaneous radiofrequency ablation of osteoid osteoma: local experience. Hong Kong Med J 2006; 12:305-9. [PMID: 16912358] [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: 05/11/2023] Open
Abstract
Osteoid osteoma is a slow-growing tumour with limited growth potential. In the past, treatment comprised open surgery with en-bloc resection or curettage of the tumour. In recent years, various minimally invasive percutaneous treatments have gained popularity. We report on six patients who underwent computed tomography-guided percutaneous radiofrequency ablations of osteoid osteomas between January 2000 and December 2003 in a regional hospital in Hong Kong. Technical success was achieved in all procedures, with a mean follow-up of 40 months (range, 18-65 months). Five of the six patients achieved complete pain relief after the procedure and remained pain-free on subsequent follow-up. One patient with persistent symptoms after the first ablation was successfully treated with a second ablation. The mean in-hospital stay was 2.4 days. Progress in radiological healing was observed in all patients. There was one complication of skin burn over the needle entry site. Our experience shows that percutaneous computed tomography-guided radiofrequency ablation is a minimally invasive and cost-effective treatment for osteoid osteoma.
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Affiliation(s)
- P S C Yip
- Department of Orthopaedics and Traumatology, Queen Elizabeth Hospital, Hong Kong.
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