1
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van Lieshout LP, Rubin M, Costa-Grant K, Ota S, Golebiowski D, Panico T, Wiberg E, Szymczak K, Gilmore R, Stanvick M, Burnham B, Gagnon J, Iwuchukwu I, Yang G, Ghazi I, Meola A, Dickerson R, Thiers T, Mustich L, Hayes A, Rivas I, Lotterhand J, Avila N, McGivney J, Yin J, Kelly T. A novel dual-plasmid platform provides scalable transfection yielding improved productivity and packaging across multiple AAV serotypes and genomes. Mol Ther Methods Clin Dev 2023; 29:426-436. [PMID: 37273900 PMCID: PMC10238442 DOI: 10.1016/j.omtm.2023.05.004] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 05/04/2023] [Indexed: 06/06/2023]
Abstract
Transient transfection of mammalian cells using plasmid DNA is a standard method to produce adeno-associated virus (AAV) vectors allowing for flexible and scalable manufacture. Typically, three plasmids are used to encode the necessary components to facilitate vector production; however, a dual-plasmid system, termed pDG, was introduced over 2 decades ago demonstrating two components could be combined resulting in comparable productivity to triple transfection. We have developed a novel dual-plasmid system, pOXB, with an alternative arrangement of sequences that results in significantly increased AAV vector productivity and percentage of full capsids packaged in comparison to the pDG dual design and triple transfection. Here, we demonstrate the reproducibility of these findings across seven recombinant AAV genomes and multiple capsid serotypes as well as the scalability of the pOXB dual-plasmid transfection at 50-L bioreactor scale. Purified drug substance showed a consistent product quality profile in line with triple-transfected vectors, except for a substantial improvement in intact genomes packaged using the pOXB dual- transfection system. Furthermore, pOXB dual- and triple-transfection-based vectors performed consistently in vivo. The pOXB dual plasmid represents an innovation in AAV manufacturing resulting in significant process gains while maintaining the flexibility of a transient transfection platform.
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Affiliation(s)
| | - Miranda Rubin
- Homology Medicines, Inc., 1 Patriots Park, Bedford, MA 01730, USA
| | | | - Stacy Ota
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Diane Golebiowski
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Troy Panico
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Eli Wiberg
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Klaudia Szymczak
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Richard Gilmore
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Marissa Stanvick
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Brenda Burnham
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Jeff Gagnon
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | | | - Guang Yang
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Iraj Ghazi
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Alex Meola
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Ryan Dickerson
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Thomas Thiers
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Luke Mustich
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - April Hayes
- Homology Medicines, Inc., 1 Patriots Park, Bedford, MA 01730, USA
| | - Israel Rivas
- Homology Medicines, Inc., 1 Patriots Park, Bedford, MA 01730, USA
| | - Jason Lotterhand
- Homology Medicines, Inc., 1 Patriots Park, Bedford, MA 01730, USA
| | - Nancy Avila
- Homology Medicines, Inc., 1 Patriots Park, Bedford, MA 01730, USA
| | - James McGivney
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Jin Yin
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
| | - Tim Kelly
- Oxford Biomedica Solutions LLC, 1 Patriots Park, Bedford, MA 01730, USA
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2
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Seridi N, Hamidouche M, Belmessabih N, El Kennani S, Gagnon J, Martinez G, Coutton C, Marchal T, Chebloune Y. Immortalization of primary sheep embryo kidney cells. In Vitro Cell Dev Biol Anim 2021; 57:76-85. [PMID: 33415664 DOI: 10.1007/s11626-020-00520-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 10/13/2020] [Indexed: 10/22/2022]
Abstract
Sheep primary epithelial cells are short-lived in cell culture systems. For long-term in vitro studies, primary cells need to be immortalized. This study aims to establish and characterize T immortalized sheep embryo kidney cells (TISEKC). In this study, we used fetal lamb kidneys to derive primary cultures of epithelial cells. We subsequently immortalized these cells using the large T SV40 antigen to generate crude TISEKC and isolate TISEKC clones. Among numerous clones of immortalized cells, the selected TISEKC-5 maintained active division and cell growth over 20 passages but lacked expression of the oncogenic large T SV40 antigen. Morphologically, TISEKC-5 maintained their epithelial aspect similar to the parental primary epithelial cells. However, their growth properties showed quite different patterns. Crude TISEKC, as well as the clones of TISEKC proliferated highly in culture compared to the parental primary cells. In the early passages, immortalized cells showed heterogeneous polyploidy but in the late passages the karyotype of immortalized cells became progressively stable, identical to that of the primary cells, because the TISEKC-5 cell line has lost the large SV40 T antigen expression, this cell line is a valuable tool for veterinary sciences and biotechnological productions.
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Affiliation(s)
- N Seridi
- Laboratory of Molecular and Cellular Biology, Unit of Genetics, Faculty of Biological Sciences, University of Sciences and Technology "Houari Boumediene", Algiers, Algeria
| | - M Hamidouche
- Laboratory of Production and Development of Viral Veterinary Vaccines, Pasteur Institute of Algeria, Algiers, Algeria
| | - N Belmessabih
- Laboratory of Production and Development of Viral Veterinary Vaccines, Pasteur Institute of Algeria, Algiers, Algeria
| | - S El Kennani
- INRAE/UGA USC 1450, Pathogenesis and Lentivirus Vaccination Laboratory, PAVAL Lab, Université Grenoble Alpes, 38041, Grenoble Cedex 9, France
| | - J Gagnon
- INRAE/UGA USC 1450, Pathogenesis and Lentivirus Vaccination Laboratory, PAVAL Lab, Université Grenoble Alpes, 38041, Grenoble Cedex 9, France
| | - G Martinez
- CHU Grenoble Alpes, UM de Génétique Chromosomique, Grenoble, France.,INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, Université Grenoble Alpes, 38000, Grenoble, France
| | - C Coutton
- CHU Grenoble Alpes, UM de Génétique Chromosomique, Grenoble, France.,INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, Université Grenoble Alpes, 38000, Grenoble, France
| | - T Marchal
- VetAgro Sup, UPSP ICE 2011.03.101, Laboratoire d'Histopathologie, Université de Lyon, Marcy-l'Etoile, France
| | - Y Chebloune
- INRAE/UGA USC 1450, Pathogenesis and Lentivirus Vaccination Laboratory, PAVAL Lab, Université Grenoble Alpes, 38041, Grenoble Cedex 9, France.
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3
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Mordhorst A, Yang G, Zhang B, Suri S, Kizhakkedathu J, Gagnon J, Chen J. Evaluation of Hydrophilic Polymer Embolization From Endovascular Sheath Devices in an In Vitro Perfusion System. J Vasc Surg 2020. [DOI: 10.1016/j.jvs.2020.08.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Gasse A, Kim WS, Gagnon J. Association between depression and hostile attribution bias in hostile and non-hostile individuals: An ERP study. J Affect Disord 2020; 276:1077-1083. [PMID: 32771859 DOI: 10.1016/j.jad.2020.06.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 05/31/2020] [Accepted: 06/23/2020] [Indexed: 11/24/2022]
Abstract
BACKGROUND Hostility and aggression have been found to be highly prevalent among depressed patients and are associated with higher comorbidity and illness severity levels. Although negative interpretation biases are a fundamental element of cognitive models of depression, few studies have examined the specific biases in information processing, mainly the hostile attribution bias, found in hostile individuals who present depressive symptoms. METHOD Using pre-collected data from a sample of 72 (male=41,6%, female=58,3%) undergraduate and community-based hostile (n = 26) and non-hostile (n = 46) adult participants, the authors aimed to examine the association between depression and the hostile attribution bias by determining whether depression level scores were uniquely related to electrophysiological measures of the hostile attribution bias. RESULTS The hostile group showed higher measured levels of depression and reactive aggression compared to the non-hostile group. Also, depression scores were significant predictors of the N400 effect in the non-hostile task condition, while reactive aggression was not, whereas in the hostile condition, the overall model was significant, with depression and reactive aggression levels both showing strong trends towards significance. LIMITATIONS A small sample size limited the scope of our conclusions. Also, sample selection prevented us from examining specific group differences regarding the hostile attribution bias in depressed and non-depressed groups. CONCLUSION Clinical and research implications include the necessity to apply cognitive restructuring techniques to counter biased interpretation processes in settings where depression and aggression intersect, and the need to consider alternatives to self-evaluative methodologies.
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Affiliation(s)
- A Gasse
- Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal, Canada; Laboratoire d'électrophysiologie en neuroscience sociale (LENS), University of Montreal, Canada; School of Criminology, University of Montreal, Canada.
| | - W S Kim
- Department of Psychology, University of Montreal, Canada; Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal, Canada; Laboratoire d'électrophysiologie en neuroscience sociale (LENS), University of Montreal, Canada
| | - J Gagnon
- Department of Psychology, University of Montreal, Canada; Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal, Canada; Laboratoire d'électrophysiologie en neuroscience sociale (LENS), University of Montreal, Canada
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Breton M, Ann Smithman M, Lamoureux‐Lamarche C, Dumas Pilon M, Keely E, Farrell G, Singer A, Woods P, Bibeau C, Nabelsi V, Gaboury I, Gagnon M, Steele Gray C, Shaw J, Hudon C, Aubrey‐Bassler K, Bush P, Côté‐Boileau É, Gagnon J, Visca R, Liddy C. DISSEMINATION, IMPLEMENTATION, AND IMPACT. Health Serv Res 2020. [DOI: 10.1111/1475-6773.13409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- M. Breton
- University of Sherbrooke Longueuil QC Canada
| | | | | | - M. Dumas Pilon
- Collège québécois des médecins de famille Laval QC Canada
| | - E. Keely
- Department of Medicine University of Ottawa Ottawa ON Canada
| | | | - A. Singer
- University of Manitoba Winnipeg MB Canada
| | | | | | - V. Nabelsi
- Université du Québec en Outaouais Gatineau QC Canada
| | - I. Gaboury
- University of Sherbrooke Longueuil QC Canada
| | | | | | - J. Shaw
- Women's College Hospital Toronto ON Canada
| | - C. Hudon
- University of Sherbrooke Sherbrooke QC Canada
| | | | - P. Bush
- McGill University Montréal QC Canada
| | | | - J. Gagnon
- McGill University Montréal QC Canada
| | - R. Visca
- McGill University Montréal QC Canada
| | - C. Liddy
- Family Medicine C.T. Lamont Primary Health Care Research Centre Bruyère Research Institute Ottawa ON Canada
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Campbell O, MacDonald VS, Dickinson RM, Gagnon J. Evaluation of the effect of vincristine on platelet count in dogs with lymphoma. J Small Anim Pract 2019; 60:734-738. [PMID: 31737905 DOI: 10.1111/jsap.13080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 08/23/2019] [Accepted: 08/30/2019] [Indexed: 12/28/2022]
Abstract
OBJECTIVES To determine the effect of vincristine administration on the platelet count, platelet morphology and incidence of thrombocytopenia in dogs diagnosed with lymphoma. MATERIAL AND METHODS Medical records of 59 dogs with lymphoma receiving vincristine sulphate were reviewed retrospectively. RESULTS Following vincristine administration the platelet count was higher and the number of thrombocytopenic patients was lower. No difference was found in the number of dogs with enlarged and elliptical platelets following vincristine treatment. CLINICAL SIGNIFICANCE Vincristine administration increases platelet counts in dogs with lymphoma. It is not contra-indicated to administer vincristine to dogs with lymphoma that are thrombocytopenic.
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Affiliation(s)
- O Campbell
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - V S MacDonald
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - R M Dickinson
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - J Gagnon
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
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7
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Cieri UR, Bertrand R, Choi KK, Gagnon J, Krol P, Latzo P, Lau D, Melendez J, Pyramides G, Sen S, Steible D, Weigand J. Determination of Atropine (Hyoscyamine) Sulfate in Commercial Products by Liquid Chromatography with UV Absorbance and Fluorescence Detection: Multilaboratory Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/86.6.1128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A liquid chromatographic (LC) method with 2 detection systems for determining atropine (hyoscyamine) sulfate in commercial products was tested in a multilaboratory study. Depending on the type of product, sample solutions are prepared in methanol or methanol–water (1 + 1). The standard solution contains about 1.0 mg atropine sul-fate/100 mL and is prepared in the same solvent used in sample preparation. LC separations are performed on a 7.5 cm Novapak silica column. The mobile phase is prepared by mixing 970 mL methanol with 30 mL of a 1% aqueous solution of 1-pentanesulfonic acid, sodium salt. Detection is by 2 systems, UV absorbance detection at 220 nm and fluorescence detection with excitation at 255 nm and emission at 285 nm. The injection volume is 100 or 200 μL. The following materials were used for the study: 2 separate samples of tablets labeled to contain 0.4 mg atropine sulfate, 2 separate samples of extended-release tablets labeled to contain 0.375 mg hyoscyamine sulfate, one sample of atropine sulfate injection labeled to contain 2 mg/mL, and one sample of 1% (v/v) atropine sul-fate ophthalmic. Eight participants analyzed 2 separate portions of the 6 samples by both detection systems. A ninth participant analyzed the samples in duplicate but only by UV absorbance detection because of the unavailability of a fluorescence detector. The relative standard deviation (RSD) between laboratories ranged from 1.4 to 3.3% for samples of tablets and injections but higher for ophthalmic solutions (5.1–5.2%). A linearity study was conducted in the originating laboratory before the multilaboratory study with 5 solutions ranging in concentration from 0.80 to 1.20 mg atropine sul-fate in 100 mL. Average recoveries were 100.0% by UV absorbance detection and 99.9% by fluorescence detection; the RSDs were 1.1 and 1.2%, respectively.
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Affiliation(s)
- Ugo R Cieri
- U.S. Food and Drug Administration, 2nd and Chestnut Sts, Philadelphia, PA 19106
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8
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Campbell O, Gagnon J, Rubin JE. Antibacterial activity of chemotherapeutic drugs against Escherichia coli and Staphylococcus pseudintermedius. Lett Appl Microbiol 2019; 69:353-357. [PMID: 31508840 DOI: 10.1111/lam.13213] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 07/07/2019] [Revised: 09/03/2019] [Accepted: 09/04/2019] [Indexed: 11/30/2022]
Abstract
The ability of chemotherapeutic agents to affect the growth of common bacterial pathogens and the relationship between the effects of chemotherapeutics and antimicrobials is largely unknown. The purpose of this study was to describe the susceptibility of canine bacterial isolates to chemotherapeutic agents and to compare these results to their antimicrobial susceptibility. The effects of bleomycin, doxorubicin, cytarabine, cyclophosphamide, methotrexate, 5-fluorouracil and gemcitabine on the growth of 33 Staphylococcus pseudintermedius isolates and 32 Escherichia coli isolates from dogs was determined by agar dilution. In addition to MICs, the lowest drug concentration associated with a decreased colony size was recorded. Results were compared to the MICs of a panel of antimicrobial agents. Bleomycin consistently inhibited bacterial growth of S. pseudintermedius and E. coli. Doxorubicin inhibited S. pseudintermedius but not E. coli while the opposite was seen for gemcitabine. Reduction in colony size on exposure to 5-fluorouracil for both organisms, and methotrexate for S. pseudintermedius was seen. No observable effect of cyclophosphamide or cytarabine was observed. Associations between elevated MICs to chemotherapeutic drugs and antimicrobial resistance were not found. These results indicate that chemotherapeutic agents affect the growth of bacteria, but do not support a role in the selection of antimicrobial resistance. SIGNIFICANCE AND IMPACT OF THE STUDY: This study shows that chemotherapy drugs commonly used in veterinary oncology have an effect of the growth of canine isolates of Escherichia coli and Staphylococcus pseudintermedius. No associations between susceptibility to chemotherapeutic drugs and antibiotics were found, which does not support selection of antimicrobial resistance by chemotherapy drugs.
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Affiliation(s)
- O Campbell
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - J Gagnon
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - J E Rubin
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
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9
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Kong L, Jin Q, Sotir S, Paolone V, Gagnon J, Headley S. The Effects Of A Three-week Hiit Program On Physiological And Physical Performance Parameters. Med Sci Sports Exerc 2018. [DOI: 10.1249/01.mss.0000538530.00736.41] [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: 11/21/2022]
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10
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Latreille V, Gaubert M, Dubé J, Lina J, Gagnon J, Carrier J. 0272 Thinning of Medial Frontal and Anterior Cingulate Cortices Explain Age-related Changes in REM and NREM Sleep. Sleep 2018. [DOI: 10.1093/sleep/zsy061.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- V Latreille
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Psychology, University of Montreal, Montreal, QC, CANADA
| | - M Gaubert
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Psychology, University of Quebec in Montreal, Montreal, QC, CANADA
| | - J Dubé
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Psychology, University of Montreal, Montreal, QC, CANADA
| | - J Lina
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, CANADA
| | - J Gagnon
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Psychology, University of Quebec in Montreal, Montreal, QC, CANADA
| | - J Carrier
- Centre d’études avancées en médecine du sommeil, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, CANADA
- Department of Psychology, University of Montreal, Montreal, QC, CANADA
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11
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Gagnon K, Baril A, Montplaisir J, Carrier J, Chami S, Gauthier S, Lafond C, Gagnon J, Gosselin N. 0593 Detection Of Mild Cognitive Impairment In Older Individuals With Obstructive Sleep Apnea. Sleep 2018. [DOI: 10.1093/sleep/zsy061.592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- K Gagnon
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - A Baril
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - J Montplaisir
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - J Carrier
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - S Chami
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | | | - C Lafond
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - J Gagnon
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
| | - N Gosselin
- Center for Advanced Research in Sleep Medicine, Montréal, QC, CANADA
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12
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Vedel I, Arsenault-Lapierre G, Ladores M, Saad H, Gagnon J, D’Souza V, Kremer B. EFFECT OF A PRIMARY CARE VIRTUAL WARD ON THE READMISSION RATES OF OLDER PATIENTS POST DISCHARGE. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- I. Vedel
- Lady Davis Institute, Jewish General Hospital, Montreal, Quebec, Canada,
- Department of Family Medicine, McGill University, Montreal, Quebec, Canada
| | | | - M. Ladores
- Herzl Family Practice Center, Jewish General Hospital, Montreal, Quebec, Canada,
| | - H. Saad
- Lady Davis Institute, Jewish General Hospital, Montreal, Quebec, Canada,
- Department of Family Medicine, McGill University, Montreal, Quebec, Canada
| | - J. Gagnon
- Department of Family Medicine, McGill University, Montreal, Quebec, Canada
| | - V. D’Souza
- Herzl Family Practice Center, Jewish General Hospital, Montreal, Quebec, Canada,
| | - B. Kremer
- Herzl Family Practice Center, Jewish General Hospital, Montreal, Quebec, Canada,
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13
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Bernier-Lalonger L, Bourgouin P, Escudier F, Postuma R, Génier Marchand D, De Roy J, Montplaisir J, Gagnon J. 0723 OLFACTION AND COLOR DISCRIMINATION DYSFUNCTIONS IN RAPID EYE MOVEMENT SLEEP BEHAVIOR DISORDER: ASSOCIATION WITH MILD COGNITIVE IMPAIRMENT. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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14
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Gagnon K, Baril A, Montplaisir J, Carrier J, D’Aragon C, Gauthier S, Lafond C, Gagnon J, Gosselin N. 0283 SUBJECTIVE COGNITIVE COMPLAINT IN LATE MIDDLE-AGED AND OLDER INDIVIDUALS WITH OBSTRUCTIVE SLEEP APNEA. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Bourgouin P, Bernier-Lalonger L, Escudier F, B Postuma R, Génier Marchand D, De Roy J, Montplaisir J, Gagnon J. 0726 MOOD AND SLEEP QUALITY SYMPTOMS ARE NOT LINKED TO MILD COGNITIVE IMPAIRMENT IN RAPID EYE MOVEMENT SLEEP BEHAVIOR DISORDER. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Brayet P, Lafrenière A, Petit D, Gagnon J, Gosselin N, Lina J, Carrier J, Montplaisir J. 0284 FUNCTIONAL CONNECTIVITY DURING REM SLEEP IN HEALTHY AGING. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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17
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Pelletier A, Adam B, Gagnon J, Postuma RB, Paquet J, Montplaisir J. 0727 TONIC AND PHASIC CHIN EMG DENSITY IN IDIOPATHIC REM SLEEP BEHAVIOR DISORDER. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gagnon J, Lévesque E, Borduas F, Chiquette J, Diorio C, Duchesne N, Dumais M, Eloy L, Foulkes W, Gervais N, Lalonde L, L'Espérance B, Meterissian S, Provencher L, Richard J, Savard C, Trop I, Wong N, Knoppers BM, Simard J. Recommendations on breast cancer screening and prevention in the context of implementing risk stratification: impending changes to current policies. ACTA ACUST UNITED AC 2016; 23:e615-e625. [PMID: 28050152 DOI: 10.3747/co.23.2961] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In recent years, risk stratification has sparked interest as an innovative approach to disease screening and prevention. The approach effectively personalizes individual risk, opening the way to screening and prevention interventions that are adapted to subpopulations. The international perspective project, which is developing risk stratification for breast cancer, aims to support the integration of its screening approach into clinical practice through comprehensive tool-building. Policies and guidelines for risk stratification-unlike those for population screening programs, which are currently well regulated-are still under development. Indeed, the development of guidelines for risk stratification reflects the translational aspects of perspective. Here, we describe the risk stratification process that was devised in the context of perspective, and we then explain the consensus-based method used to develop recommendations for breast cancer screening and prevention in a risk-stratification approach. Lastly, we discuss how the recommendations might affect current screening policies.
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Affiliation(s)
- J Gagnon
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - E Lévesque
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | | | - F Borduas
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
| | - J Chiquette
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
| | - C Diorio
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
| | - N Duchesne
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
| | - M Dumais
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - L Eloy
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire (chu) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard);; Joliette, QC: Centre hospitalier régional de Lanaudière (Eloy)
| | - W Foulkes
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - N Gervais
- Rivière-du-Loup, QC: Centre hospitalier du Grand-Portage (Gervais)
| | - L Lalonde
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - B L'Espérance
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - S Meterissian
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - L Provencher
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
| | - J Richard
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - C Savard
- St-Raymond, QC: Centre de santé et de services sociaux de Portneuf (Savard)
| | - I Trop
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - N Wong
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - B M Knoppers
- Montreal, QC: Centre of Genomics and Policy, Department of Human Genetics, McGill University (Gagnon, Lévesque, Knoppers); Quebec Breast Cancer Foundation [Dumais (observing member)]; Sir Mortimer B. Davis Jewish General Hospital and McGill University Health Centre (Foulkes); Breast Imaging Centre, Centre hospitalier de l'Université de Montréal (Lalonde, Trop); Hôpital du Sacré-Coeur de Montréal and Groupe d'Étude en Oncologie du Québec (L'Espérance); Royal Victoria Hospital and Cedars Breast Clinic of the McGill University Health Centre (Meterissian); Centre Intégré en traitement, recherche et enseignement en Cancer du Sein, Centre hospitalier de l'Université de Montréal (Richard); Sir Mortimer B. Davis Jewish General Hospital and McGill University (Wong)
| | - J Simard
- Quebec City, QC: Public Health Branch, Capitale-Nationale (Borduas); Centre hospitalier universitaire ( chu ) de Québec-Université Laval (Chiquette, Duchesne, Provencher); Centre de coordination des services régionaux, Capitale-Nationale (Chiquette); Quebec Breast Cancer Screening Program (Chiquette, Eloy); chu de Québec-Université Laval Research Center and Department of Social and Preventive Medicine, Université Laval (Diorio); Cancer Branch, Ministry of Health and Social Services (Eloy); Deschênes-Fabia Breast Diseases Center (Provencher); chu de Québec-Université Laval (Duchesne); Canada Research Chair in Oncogenetics, chu de Québec-Université Laval Research Centre, and Department of Molecular Medicine, Université Laval (Simard)
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Carrier Emond F, Nolet K, Cyr G, Rouleau JL, Gagnon J. Sexual impulsivity and problematic sexual behaviors in adults: Towards innovative domain-specific behavioral measures. Sexologies 2016. [DOI: 10.1016/j.sexol.2015.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Gagnon J, Clift MJD, Vanhecke D, Widnersson IE, Abram SL, Petri-Fink A, Caruso RA, Rothen-Rutishauser B, Fromm KM. Synthesis, characterization, antibacterial activity and cytotoxicity of hollow TiO2-coated CeO2nanocontainers encapsulating silver nanoparticles for controlled silver release. J Mater Chem B 2016; 4:1166-1174. [DOI: 10.1039/c5tb01917f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This novel type of nanocontainers offers the concept of potentially controlling silver delivery for the prevention of implant-associated infections.
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Affiliation(s)
- J. Gagnon
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
- PFPC
| | - M. J. D. Clift
- Adolphe Merkle Institute
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - D. Vanhecke
- Adolphe Merkle Institute
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - I. E. Widnersson
- PFPC
- School of Chemistry
- The University of Melbourne
- Melbourne, Victoria 3010
- Australia
| | - S.-L. Abram
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - A. Petri-Fink
- Adolphe Merkle Institute
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - R. A. Caruso
- PFPC
- School of Chemistry
- The University of Melbourne
- Melbourne, Victoria 3010
- Australia
| | | | - K. M. Fromm
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
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Gagnon J, Zhu L, Anini Y, Wang Q. Neutralizing circulating ghrelin by expressing a growth hormone secretagogue receptor-based protein protects against high-fat diet-induced obesity in mice. Gene Ther 2015; 22:750-7. [PMID: 25965396 DOI: 10.1038/gt.2015.38] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 03/24/2015] [Accepted: 04/07/2015] [Indexed: 01/29/2023]
Abstract
Ghrelin is a stomach-derived peptide hormone that stimulates appetite and promotes adiposity through binding to the growth hormone secretagogue receptor (GHS-R1a). Administration of ghrelin in rodents increases weight gain due to stimulating food intake and reducing fat utilization. Therefore, reducing circulating ghrelin levels holds the potential to reduce weight gain. We developed a GHS-R1a-fusion constructs of a decoy protein containing the ligand-binding domains of the ghrelin receptor. Intramuscular injection of the GHSR/Fc plasmid decreased circulating levels of acylated-ghrelin. When challenged with the high fat diet, treated mice displayed reduced weight gain compared with controls, which was associated with reduced fat accumulation in the peritoneum but not lean mass. Quantitative PCR with reverse transcription showed increased PPARγ and hormone sensitive lipase transcripts levels in adipose tissue of treated animals, illustrating a preference for increased fat utilization. Intra-peritoneal glucose tolerance and insulin tolerance tests showed improved glucose clearance and insulin sensitivity in GHSR/Fc treated animals. We suggest that in vivo expression of the GHSR-based fusion protein prevents diet-induced weight gain, altering adipose gene expression and improving glucose tolerance. These findings, while confirming the role of ghrelin in peripheral energy metabolism, suggest that a strategy involving neutralization of the circulation ghrelin by intramuscular injection of the GHSR1/Fc fusion construct may find clinical application in the treatment of obesity.
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Affiliation(s)
- J Gagnon
- Department of Obstetrics and Gynecology, Dalhousie University, Halifax, NS, Canada.,Department of Physiology and Biophysics, Dalhousie University, Halifax, NS, Canada
| | - L Zhu
- Division of Endocrinology and Metabolism, the Keenan Research Centre in the Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada.,Departments of Physiology and Medicine, University of Toronto, Toronto, ON, Canada
| | - Y Anini
- Department of Obstetrics and Gynecology, Dalhousie University, Halifax, NS, Canada.,Department of Physiology and Biophysics, Dalhousie University, Halifax, NS, Canada
| | - Q Wang
- Division of Endocrinology and Metabolism, the Keenan Research Centre in the Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada.,Departments of Physiology and Medicine, University of Toronto, Toronto, ON, Canada
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Ayvazian L, Germain M, Gagnon J, Milch C, Evans B, Wood R, Joubert J, Cornelius A. Treadmill Time - A Sensitive Indicator of Improved Functional Capacity in CKD. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000478447.53040.49] [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: 11/21/2022]
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Gagnon J, Clift MJD, Vanhecke D, Kuhn DA, Weber P, Petri-Fink A, Rothen-Rutishauser B, Fromm KM. Integrating silver compounds and nanoparticles into ceria nanocontainers for antimicrobial applications. J Mater Chem B 2015; 3:1760-1768. [DOI: 10.1039/c4tb02079k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silver compounds and nanoparticles (NPs) are gaining increasing interest in medical applications, specifically in the treatment and prevention of biomaterial-related infections.
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Affiliation(s)
- J. Gagnon
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - M. J. D. Clift
- Adolphe Merkle Institute and Fribourg Center for Nanomaterials
- University of Fribourg
- Route de l'Ancienne Papeterie
- 1723 Marly
- Switzerland
| | - D. Vanhecke
- Adolphe Merkle Institute and Fribourg Center for Nanomaterials
- University of Fribourg
- Route de l'Ancienne Papeterie
- 1723 Marly
- Switzerland
| | - D. A. Kuhn
- Adolphe Merkle Institute and Fribourg Center for Nanomaterials
- University of Fribourg
- Route de l'Ancienne Papeterie
- 1723 Marly
- Switzerland
| | - P. Weber
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
| | - A. Petri-Fink
- Adolphe Merkle Institute and Fribourg Center for Nanomaterials
- University of Fribourg
- Route de l'Ancienne Papeterie
- 1723 Marly
- Switzerland
| | - B. Rothen-Rutishauser
- Adolphe Merkle Institute and Fribourg Center for Nanomaterials
- University of Fribourg
- Route de l'Ancienne Papeterie
- 1723 Marly
- Switzerland
| | - K. M. Fromm
- Department of Chemistry and Fribourg Center for Nanomaterials
- University of Fribourg
- 1700 Fribourg
- Switzerland
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Abstract
Precise structural data on C1s-C1r-C1r-C1s, the catalytic subunit of C1 (the first component of the classical pathway of human complement), led to the emergence of a structural and functional model of this complex protease. Now with new structural information on the amino acid sequence of the protease responsible for C1 activation (C1r), Gérard Arlaud and his colleagues propose a refinement of their original C1 model, and an overall scheme of the intramolecular events associated with the activation and control of C1.
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Affiliation(s)
- G J Arlaud
- Département de Recherches Fondamentales (Unité INSERM 238), Laboratoire d'Immunochimie, Centre d'Etudes Nucléaires de Grenoble, 85X, 38041 Grenoble Cedex, France
| | - M G Colomb
- Département de Recherches Fondamentales (Unité INSERM 238), Laboratoire d'Immunochimie, Centre d'Etudes Nucléaires de Grenoble, 85X, 38041 Grenoble Cedex, France
| | - J Gagnon
- Conseil National de Recherches du Canada, Institut de Recherches en Biotechnologie, Montréal, Québec, Canada H4P 2RJ
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Pouliot E, Larose S, Gagnon J, Belanger RE. 114: Use of Soft Tissue Neck Radiographs in Pediatric Acute Airway Obstructions: Current Perspective. Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pouliot E, Larose S, Gagnon J, Bélanger RE. 193: Identifying Radiologic Signs of Life-Threatening Causes of Acute Upper Airway Obstruction in Children: Not That Easy! Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Homayoon B, Thakor A, Salvian A, Gagnon J, Klass D, Yenson P, Liu D. Trellis pharmacomechanical thrombectomy followed by catheter-directed thrombolysis versus catheter-directed thrombolysis alone in treatment of acute upper extremity deep vein thrombosis – a 5 year single center experience. J Vasc Interv Radiol 2014. [DOI: 10.1016/j.jvir.2013.12.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Baril A, Gagnon K, Montplaisir J, Soucy J, Gagnon J, Gosselin N. Reduction in regional cerebral blood flow in obstructive sleep apnea during wakefulness: A high-resolution SPECT study. Sleep Med 2013. [DOI: 10.1016/j.sleep.2013.11.135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abe S, Gagnon J, Montplaisir J, Rompré P, Kawano F, Lavigne G. Sleep bruxism and masseter muscle activity during rem sleep of rem sleep behavior disorder patients: a case control study. Sleep Med 2013. [DOI: 10.1016/j.sleep.2013.11.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gagnon J, Sheppard E, Anini Y. Metformin directly inhibits ghrelin secretion through AMP-activated protein kinase in rat primary gastric cells. Diabetes Obes Metab 2013; 15:276-9. [PMID: 23066988 DOI: 10.1111/dom.12021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 09/11/2012] [Accepted: 10/01/2012] [Indexed: 01/03/2023]
Abstract
The antidiabetic drug Metformin causes weight loss in both diabetic and non-diabetic individuals. Metformin treatment is also associated with lower circulating levels of the orexigenic hormone ghrelin. To test whether Metformin directly affects ghrelin cells, rat primary stomach cells were treated with Metformin and the levels of ghrelin secretion, proghrelin gene expression and activation of adenosine monophosphate-activated protein kinase (AMPK) were examined. Metformin significantly reduced ghrelin secretion and proghrelin mRNA production and both these effects were blocked by co-incubation with the AMPK inhibitor compound C. Furthermore, the AMPK activator 5-amino-1-β-D-ribofuranosyl-imidazole-4-carboxamide (AICAR) significantly inhibited ghrelin secretion. Additionally, ghrelin cells were shown to express AMPK. Finally, Metformin treatment caused a significant increase in the level of phosphorylated (active) AMPK. Our results show that Metformin directly inhibits stomach ghrelin production and secretion through AMPK. This reduction in ghrelin secretion may be one of the key components in Metformin's mechanism of weight loss.
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Affiliation(s)
- J Gagnon
- Departments of Obstetrics & Gynecology and Physiology & Biophysics, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
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Wirth A, Hassan MT, Grguraš I, Gagnon J, Moulet A, Luu TT, Pabst S, Santra R, Alahmed ZA, Azzeer AM, Yakovlev VS, Pervak V, Krausz F, Goulielmakis E. Synthesized Light Transients. Science 2011; 334:195-200. [DOI: 10.1126/science.1210268] [Citation(s) in RCA: 483] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- A. Wirth
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - M. Th. Hassan
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - I. Grguraš
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - J. Gagnon
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - A. Moulet
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - T. T. Luu
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - S. Pabst
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
- Department of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
| | - R. Santra
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
- Department of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
| | - Z. A. Alahmed
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - A. M. Azzeer
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - V. S. Yakovlev
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - V. Pervak
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - F. Krausz
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - E. Goulielmakis
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
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Fiess M, Schultze M, Goulielmakis E, Dennhardt B, Gagnon J, Hofstetter M, Kienberger R, Krausz F. Versatile apparatus for attosecond metrology and spectroscopy. Rev Sci Instrum 2010; 81:093103. [PMID: 20886972 DOI: 10.1063/1.3475689] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We present the AS-2 Attosecond Beamline at the Joint Laboratory for Attosecond Physics of the Max-Planck-Institut für Quantenoptik and Ludwig-Maximilians-Universität for time resolved pump/probe experiments with attosecond resolution. High harmonic generation and subsequent filtering of the generated extreme ultraviolet (XUV) continuum by means of metal filters and XUV multilayer mirrors serve for the generation of isolated attosecond laser pulses. After high harmonic generation, the remaining fundamental laser pulse is spatially separated from the attosecond XUV pulse, to what is to our knowledge for the first time, by means of a perforated mirror in a Mach-Zehnder interferometer. Active stabilization of this interferometer guarantees the necessary temporal resolution for tracking attosecond dynamics in real time. As a proof-of-principle, photoelectron streaking experiments are performed and experimental techniques for their realization are summarized. Finally we highlight the potential of the presented beamline system for future experiments in comparison with previously demonstrated attosecond beamlines.
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Affiliation(s)
- M Fiess
- Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.
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Gagnon MP, Pluye P, Desmartis M, Car J, Pagliari C, Labrecque M, Frémont P, Gagnon J, Njoya M, Légaré F. A systematic review of interventions promoting clinical information retrieval technology (CIRT) adoption by healthcare professionals. Int J Med Inform 2010; 79:669-80. [PMID: 20727819 DOI: 10.1016/j.ijmedinf.2010.07.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 06/18/2010] [Accepted: 07/21/2010] [Indexed: 11/29/2022]
Abstract
PURPOSE This paper presents the evidence on the effectiveness of interventions promoting the use of clinical information retrieval technologies (CIRTs) by healthcare professionals. METHODS We electronically searched articles published between January 1990 and March 2008 using following inclusion criteria: (1) participants were healthcare professionals; (2) specific intervention promoted CIRT adoption; (3) studies were randomised controlled trials, controlled clinical trials, controlled before and after studies or interrupted time series analyses; and (4) they objectively reporting measured outcomes on CIRT use. RESULTS We found nine studies focusing on CIRT use. Main outcomes measured were searching skills and/or frequency of use of electronic databases by healthcare professionals. Three studies reported a positive effect of the intervention on CIRT use, one showed a positive impact post-intervention, and four studies failed to demonstrate significant intervention effect. The ninth study examined financial disincentives, and found a significant negative effect of introducing user fees for searching MEDLINE in clinical settings. A meta-analysis showed that educational meetings were the only type of interventions reporting consistent positive effects on CIRT adoption. CONCLUSION CIRT is an information and communication technology commonly used in healthcare settings. Interventions promoting CIRT adoption by healthcare professionals have shown some success in improving searching skills and use of electronic databases. However, the effectiveness of these interventions remains uncertain and more rigorous studies are needed.
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Affiliation(s)
- M-P Gagnon
- Quebec University Hospital Research Centre, Québec, Canada.
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Yakovlev VS, Gagnon J, Karpowicz N, Krausz F. Attosecond streaking enables the measurement of quantum phase. Phys Rev Lett 2010; 105:073001. [PMID: 20868037 DOI: 10.1103/physrevlett.105.073001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Indexed: 05/29/2023]
Abstract
Attosecond streaking, as a measurement technique, was originally conceived as a means to characterize attosecond light pulses, which is a good approximation if the relevant transition matrix elements are approximately constant within the bandwidth of the light pulse. Our analysis of attosecond streaking measurements on systems with a complex response to the photoionizing pulse reveals the relation between the momentum-space wave function of the outgoing electron and the result of conventional retrieval algorithms. This finding enables the measurement of the quantum phase associated with bound-continuum transitions.
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Affiliation(s)
- V S Yakovlev
- Department für Physik, Ludwig-Maximilians-Universität, Am Coulombwall 1, Germany.
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Gagnon J, Thériault D, Guillot M, Archambaultt L, Beddar S, Gingras L, Beaulieu L. Poster - Thur Eve - 30: Plastic Scintillation Detector Characterization for Small Fields and Stereotactic Radiosurgery Quality Assurance. Med Phys 2010. [DOI: 10.1118/1.3476135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Schultze M, Fiess M, Karpowicz N, Gagnon J, Korbman M, Hofstetter M, Neppl S, Cavalieri AL, Komninos Y, Mercouris T, Nicolaides CA, Pazourek R, Nagele S, Feist J, Burgdorfer J, Azzeer AM, Ernstorfer R, Kienberger R, Kleineberg U, Goulielmakis E, Krausz F, Yakovlev VS. Delay in Photoemission. Science 2010; 328:1658-62. [DOI: 10.1126/science.1189401] [Citation(s) in RCA: 772] [Impact Index Per Article: 55.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Gagnon J, Thériault D, Guillot M, Archambault L, Beddar S, Gingras L, Beaulieu L. SU-GG-T-328: Dosimetric Performance of the Plastic Scintillation Detector for Radiosurgery Quality Assurance. Med Phys 2010. [DOI: 10.1118/1.3468724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Goulielmakis E, Schultze M, Hofstetter M, Yakovlev VS, Gagnon J, Uiberacker M, Aquila AL, Gullikson EM, Attwood DT, Kienberger R, Krausz F, Kleineberg U. Single-Cycle Nonlinear Optics. Science 2008; 320:1614-7. [DOI: 10.1126/science.1157846] [Citation(s) in RCA: 1300] [Impact Index Per Article: 81.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Abstract
OBJECTIVES Intranuclear rodlets (INRs) are rod-shaped intranuclear inclusions that we have described in neurons of the human brain. We recently identified these structures in pancreatic islet cells. The objectives of this study are to describe the light microscopic features and cellular pattern of distribution of INRs in human pancreatic islet cells. METHODS Double immunofluorescence staining was performed on 5 human pancreatic tissue samples for the detection of class III beta tubulin (C3T) to detect INRs and for promyelocytic leukemia (PML) protein to examine the relationship between PML and INRs. RESULTS Intranuclear rodlets were detected in 22.99% of pancreatic B cells compared with only 3.11%, 1.80%, and 1.60% of A, D, and PP cells, respectively. Twenty-four percent of C3T-immunoreactive INRs showed partial or complete immunoreactivity for PML. Promyelocytic leukemia staining within the nuclei of B cells was confined to INRs and was not present in the typical PML bodies present in other cell types. Spatially, PML and C3T staining of islet cell INRs appeared to be mutually exclusive within individual INRs. CONCLUSIONS Intranuclear rodlets are present within the nuclei of pancreatic islet cells, where they reside predominantly but not exclusively in B cells. Immunoreactivity of B-cell INRs for PML suggests that the functional significance of INRs may be related to that of PML and/or PML bodies. Conversely, the exclusive localization of PML staining to INRs in B cells indicates that PML's function in B cells is selectively associated with INRs. The mutually exclusive pattern of PML and C3T staining suggests dynamic interactions between these 2 proteins in B-cell INRs. In light of evidence for the involvement of INRs and of PML bodies in disease, it will be of interest to investigate these structures in animal models of diabetes and in human diabetes.
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Affiliation(s)
- Wendy Prichett
- Centre for Cancer Therapeutics, The Ottawa Health Research Institute, Ottawa, Ontario, Canada
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Blackburn M, Bellemare S, Gagné G, Gagnon J, Gagnon-Gervais K, Gaudet C, Messier Fugère L. Overview of the immunization product quality control practices of vaccinators in Montérégie. Can Commun Dis Rep 2007; 33:1-8. [PMID: 17205663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- M Blackburn
- Agence de la Santé et des Services sociaux de la Montérégie, Direction de la santépublique, Quebec, Canada
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Abstract
Adventitial cystic disease (ACD) is an uncommon cause of ischemia. The majority of ACD is located in the popliteal artery. Over 49 extrapopliteal locations have been described. We report on a case of femoral artery ACD in a young patient with claudication. The diagnosis was made with duplex ultrasound and confirmed with computed tomographic angiogram. The patient underwent a surgical treatment. One year postoperatively, the patient is active with no claudication. To our knowledge, this is the first reported case of extrapopliteal artery ACD in Canada.
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Affiliation(s)
- J Gagnon
- Department of Surgery, Vancouver General Hospital, Vancouver, Canada.
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Kevrekidis PG, Gagnon J, Frantzeskakis DJ, Malomed BA. X , Y , and Z waves: extended structures in nonlinear lattices. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 75:016607. [PMID: 17358275 DOI: 10.1103/physreve.75.016607] [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: 03/14/2006] [Indexed: 05/14/2023]
Abstract
We propose a new type of waveforms in two-dimensional (2D) and three-dimensional (3D) discrete media-multilegged extended nonlinear structures (ENSs), built as arrays of lattice solitons (tiles and stones, in the 2D and 3D cases, respectively). We study the stability of the tiles and stones analytically, and then extend them numerically to complete ENS forms for both 2D and 3D lattices, aiming to single out stable ENSs. The predicted patterns can be realized in Bose-Einstein condensates trapped in deep optical lattices, crystals built of microresonators, and 2D photonic crystals. In the latter case, the patterns provide for a technique for writing reconfigurable virtual partitions in multipurpose photonic devices.
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Affiliation(s)
- P G Kevrekidis
- Department of Mathematics and Statistics, University of Massachusetts, Amherst, Massachusetts 01003-4515, USA
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Haddad J, Gagnon J, Hasson C, van Emmerik R, Hamill J. The use of time-to-contact measures in assessing postural stability. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85297-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Stanforth PR, Jackson AS, Green JS, Gagnon J, Rankinen T, Desprès JP, Bouchard C, Leon AS, Rao DC, Skinner JS, Wilmore JH. Generalized abdominal visceral fat prediction models for black and white adults aged 17–65 y: the HERITAGE Family Study. Int J Obes (Lond) 2004; 28:925-32. [PMID: 15148505 DOI: 10.1038/sj.ijo.0802563] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To determine if the relationship between abdominal visceral fat (AVF) and measures of adiposity are different between Black and White subjects and to develop valid field prediction models that accurately identify those individuals with AVF levels associated with high risk for chronic disease. DESIGN Cross-sectional measurements obtained from 91 Black men, 137 Black women, 227 White men, and 237 White women subjects, ages 17-65 y, who were participants in the HERITAGE Family Study, both at baseline and following 20 weeks of endurance training. MEASUREMENTS AVF, abdominal subcutaneous fat (ASF), abdominal total fat (ATF), and sagittal diameter (SagD) were measured by computed tomography (CT). Body density was determined by hydrostatic weighing and was used to estimate relative body fat. Arm, waist (WC), and hip circumferences and skinfold thickness measures were taken, and BMI was calculated from weight (kg) and height (m(2)). Since CT abdominal fat variables were skewed, a natural log transformation (Ln) was used to produce a normal distribution. The General Linear Model (GLM) procedure was used to test the relationship between AVF and two different groups of variables-CT and anthropometric. RESULTS The AVF of White men and women was significantly higher than that of Black men and women, independent of BMI, WHR, WC, and age, and was greater for men than for women. The CT model showed that the combination of SagD, Ln (ASF), age, and race accounted for 84 and 75% of the variance in AVF in men and women, respectively. The anthropometric model provided two valid generalized field AVF prediction equations. The Field-I equation, which included BMI, WHR, age and race, had an r(2) of 0.78 and 0.73 for men and women, respectively. The Field-II equation, which included BMI (women only), WC, age, and race, had an r(2) of 0.78 and 0.72 for men and women, respectively. The field model equations became less accurate as the estimated AVF increased. CONCLUSIONS (1) At the same age and level of adiposity, Black men and women have less AVF than White men and women. These differences are greater in men than in women. (2) The field regression equations can be generalized to the diverse group of adults studied, both in an untrained and trained state. However, their accuracy decreases with increasing levels of AVF.
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Affiliation(s)
- P R Stanforth
- Department of Kinesiology and Health Education, The University of Texas, Austin, TX 78712, USA.
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Ukkola O, Rankinen T, Rice T, Gagnon J, Leon AS, Skinner JS, Wilmore JH, Rao DC, Bouchard C. Interactions among the beta2- and beta3- adrenergic receptor genes and total body fat and abdominal fat level in the HERITAGE Family Study. Int J Obes (Lond) 2003; 27:389-93. [PMID: 12629568 DOI: 10.1038/sj.ijo.0802248] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE AND SUBJECTS Interactions between markers in the beta2- and beta3-adrenergic receptor (ADR) genes and total body fat and computerized tomography-measured abdominal fat phenotypes were studied in the HERITAGE Family Study cohort of Black (n=205; 81 males and 124 females) and White (n=415; 198 males and 217 females) subjects before and after an endurance training program. RESULTS In Black subjects, beta2- and beta3-ADR gene variants showed evidence of interactions on changes in total body fat mass and abdominal fat area (P<0.005 and =0.010, respectively). Black subjects who were carriers of both beta2-ADR Arg16 and beta3-ADR Arg64 alleles had a greater decrease in total fat mass as well as abdominal total and subcutaneous, but not visceral fat areas in response to endurance training than subjects with other genotype combinations (P from 0.011 to 0.047). After correction for multiple tests, the findings remained essentially unchanged for total body fat mass and abdominal fat area, but became nonsignificant for subcutaneous fat area. The changes in abdominal fat correlated positively with the changes in fat mass (P<0.0001). The interactions between beta2 and beta3-ADR gene markers accounted for a maximum of 3% of the variances in the response of total fat mass and abdominal fat area to endurance training in Black subjects but it was not significant in White subjects. CONCLUSION Interactions between sequence variants in the beta2-beta3-ADR gene contributed to the changes in fat mass and abdominal adiposity in response to endurance training in Black subjects.
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Affiliation(s)
- O Ukkola
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA
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An P, Pérusse L, Rankinen T, Borecki IB, Gagnon J, Leon AS, Skinner JS, Wilmore JH, Bouchard C, Rao DC. Familial aggregation of exercise heart rate and blood pressure in response to 20 weeks of endurance training: the HERITAGE family study. Int J Sports Med 2003; 24:57-62. [PMID: 12582953 DOI: 10.1055/s-2003-37200] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Changes of heart rate (HR) and blood pressure (BP) relative to baseline levels in response to an extended period of endurance training are indices of cardiovascular adaptability. Familial influences were investigated for HR and BP at work rates of 50 W and 60 % of the maximal oxygen uptake (VO2max) in response to 20 weeks of endurance training. A total of 481 participants from 99 sedentary White nuclear families in the HERITAGE Family Study (HERITAGE) were analyzed using a familial correlation model. Each of these training response phenotypes was adjusted for the effects of age, BMI, cigarette smoking, baseline VO2max, and its baseline values in fathers, mothers, sons and daughters, respectively. We found that maximal heritabilities reached 34 % and 29 % for HR training responses at 50 W and 60 % of VO2 max, respectively. The heritability was 22 % for systolic BP (SBP) training response at 50 W, but negligible at 60 % of VO2max. No significant heritabilities were found for diastolic BP (DBP) training responses at either 50 W or 60 % of VO2max. Familial influences for exercise HR and BP training responses were also assessed in a total of 257 participants from 113 Black family units in HERITAGE. However, there was no significant familial resemblance, which may be attributable to the small sample size. In conclusion, HR and SBP training responses during submaximal exercise in Whites were influenced by a modest, but significant, familial component. These observations are therefore in contrast to substantial familial effects (heritability estimates of about 50 %) previously reported for these variables measured at baseline.
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Affiliation(s)
- P An
- Division of Biostatistics, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Jackson AS, Stanforth PR, Gagnon J, Rankinen T, Leon AS, Rao DC, Skinner JS, Bouchard C, Wilmore JH. The effect of sex, age and race on estimating percentage body fat from body mass index: The Heritage Family Study. Int J Obes (Lond) 2002; 26:789-96. [PMID: 12037649 DOI: 10.1038/sj.ijo.0802006] [Citation(s) in RCA: 396] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2001] [Revised: 11/28/2001] [Accepted: 01/09/2002] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To study the effects of sex, age and race on the relation between body mass index (BMI) and measured percent body fat (%fat). DESIGN Cross-sectional validation study of sedentary individuals. SUBJECTS The Heritage Family Study cohort of 665 black and white men and women who ranged in age from 17 to 65 y. MEASUREMENTS Body density determined from hydrostatic weighing. Percentage body fat determined with gender and race-specific, two-compartment models. BMI determined from height and weight, and sex and race in dummy coded form. RESULTS Polynomial regression showed that the relationship between %fat and BMI was quadratic for both men and women. A natural log transformation of BMI adjusted for the non-linearity. Test for homogeneity of log transformed BMI and gender showed that the male-female slopes were within random variance, but the intercepts differed. For the same BMI, the %fat of females was 10.4% higher than that of males. General linear models analysis of the women's data showed that age, race and race-by-BMI interaction were independently related to %fat. The same analysis applied to the men's data showed that %fat was not just a function of BMI, but also age and age-by-BMI interaction. Multiple regression analyses provided models that defined the bias. CONCLUSIONS These data and results published in the literature show that BMI and %fat relationship are not independent of age and gender. These data showed a race effect for women, but not men. The failure to adjust for these sources of bias resulted in substantial differences in the proportion of subjects defined as obese by measured %fat.
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Affiliation(s)
- A S Jackson
- Department of Health and Kinesiology, Texas A&M University, College Station, Texas, USA.
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Garenc C, Pérusse L, Chagnon YC, Rankinen T, Gagnon J, Borecki IB, Leon AS, Skinner JS, Wilmore JH, Rao DC, Bouchard C. The hormone-sensitive lipase gene and body composition: the HERITAGE Family Study. Int J Obes (Lond) 2002; 26:220-7. [PMID: 11850754 DOI: 10.1038/sj.ijo.0801872] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2001] [Revised: 07/11/2001] [Accepted: 08/15/2001] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To investigate whether the C-60G polymorphism and other markers in the hormone-sensitive lipase (LIPE) gene are associated with baseline body composition and free-fatty acid (FFA) concentrations measured at rest and during low-intensity exercise in white and black subjects participating in the HERITAGE Family Study. SUBJECTS Adult sedentary white (245 men and 258 women) and black (91 men and 185 women) subjects. MEASUREMENTS body mass index (BMI); fat mass (FAT); percentage body fat (%FAT); fat-free mass (FATFR); sum of eight skinfolds (SF8); subcutaneous (ASF), visceral (AVF) and total (ATF) abdominal fat areas assessed by CT scan; plasma FFA concentrations measured at rest (FFAR), at a power output of 50 W (FFA50) and at a relative power output of 60% of VO(2max) (FFA60%); and fasting insulin (INS). STATISTICAL ANALYSIS Association between the C-60G polymorphism of the LIPE gene and each phenotype was tested separately in men and women using ANCOVA with the effects of age and race as covariates and with further adjustment for FAT for ASF, AVF, ATF, FFAR, FFA50 and FFA60%. Secondly, owing to significant gene-by-race interaction, associations were investigated separately in each of the two race groups. Linkage was tested with the C-60G polymorphism, a dinucleotide repeat polymorphism in the intron 7 of the LIPE gene and two microsatellites markers (D19S178 and D19S903) flanking the LIPE gene. RESULTS There were no race differences in the allele frequencies of the C-60G polymorphism of the LIPE gene. No association or gene-by-race interaction was observed in men. However, in women, strong gene-by-race interactions were observed for BMI (P=0.0005), FAT (P=0.0007), %FAT (P=0.0003), SF8 (P=0.0001), ASF (P=0.03) and ATF (P=0.01). When the analysis was performed separately in each race, white women carriers of the -60G allele exhibited lower %FAT (P=0.005) and SF8 (P=0.01) than non-carriers, while in black women, the -60G allele was associated with higher BMI (P=0.004), FAT (P=0.009), %FAT (P=0.01) and SF8 (P=0.0009). These associations were no longer significant after adjusting for INS. Evidence of linkage was observed in whites with ATF, FFAR, FFA50 and FFA60%. CONCLUSION These results suggest that the C-60G polymorphism in the LIPE gene plays a role in determining body composition and that its effect is sex-, race- and insulin-dependent.
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Affiliation(s)
- C Garenc
- Division of Kinesiology, Department of Preventive Medicine, Laval University, Ste-Foy, Québec, Canada
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Leon AS, Gaskill SE, Rice T, Bergeron J, Gagnon J, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Variability in the response of HDL cholesterol to exercise training in the HERITAGE Family Study. Int J Sports Med 2002; 23:1-9. [PMID: 11774059 DOI: 10.1055/s-2002-19270] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In the HERITAGE Family Study, 675 sedentary, healthy, white and black men and women, aged 17 to 65 years, performed 20 weeks of supervised cycle ergometer exercise at the same relative intensity and weekly volume. As a group, subjects had normal mean baseline lipid levels for North Americans with the exception of below average high density lipoprotein cholesterol (HDL-C) levels. A significant mean increase in plasma HDL-C of 3.6 % was observed; however, there was marked variability in responsiveness to training, ranging from a mean 9.3 % decrease in Quartile 1 of HDL-C response to a mean 18 % increase in Quartile 4 (P < 0.0001 by ANOVA). Parallel changes in HDL(2)-C and HDL(3)-C, apolipoprotein A-I levels, and lipoprotein lipase activity were noted across quartiles. The change in HDL-C across quartiles was inversely related to baseline HDL-C (p < 0.0001) and to changes with training in plasma triglycerides (p = 0.0007). No significant differences in HDL-C response were observed across quartiles by sex, race, age, or increase in VO(2)max with training; however, weak positive associations were observed with age-adjusted education level and with reduction in abdominal fat and increase in VO(2)max at the ventilatory threshold following training. Multivariate regression analysis including baseline variables and training responses only accounted for 15.5 % of the variability in the HDL-C response to training. Thus, marked variability was found in the HDL-C response to the same endurance exercise training stimulus with only a modest amount of the response predictable by identified nongenetic factors.
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Affiliation(s)
- A S Leon
- Laboratory of Physiological Hygiene and Exercise Science, Division of Kinesiology, University of Minnesota, Minneapolis, MN 55455, USA.
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