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Baillot A, Asselin M, Bernard P, Lapointe J, Bond DS, Romain AJ, Garneau PY, Biertho L, Tchernof A, Blackburn P, Langlois MF, Brunet J. Acceptability and Feasibility of the Telehealth Bariatric Behavioral Intervention to Increase Physical Activity Before Bariatric Surgery: A Single-Case Experimental Study (Part I). Obes Surg 2024; 34:1639-1652. [PMID: 38483742 DOI: 10.1007/s11695-024-07161-0] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/04/2024] [Accepted: 03/06/2024] [Indexed: 04/20/2024]
Abstract
BACKGROUND Physical activity (PA) can play an important role in optimizing metabolic/bariatric surgery (MBS) outcomes. However, many MBS patients have difficulty increasing PA, necessitating the development of theory-driven counseling interventions. This study aimed to (1) assess the feasibility and acceptability of the TELEhealth BARIatric behavioral intervention (TELE-BariACTIV) trial protocol/methods and intervention, which was designed to increase moderate-to-vigorous intensity physical activity (MVPA) in adults awaiting MBS and (2) estimate the effect of the intervention on MVPA. METHODS This trial used a repeated single-case experimental design. Twelve insufficiently active adults awaiting MBS received 6 weekly 45-min PA videoconferencing counseling sessions. Feasibility and acceptability data (i.e., refusal, recruitment, retention, attendance, and attrition rates) were tracked and collected via online surveys, and interviews. MVPA was assessed via accelerometry pre-, during, and post-intervention. RESULTS Among the 24 patients referred to the research team; five declined to participate (refusal rate = 20.8%) and seven were ineligible or unreachable. The recruitment rate was 1.2 participants per month between 2021-09 and 2022-07. One participant withdrew during the baseline phase, and one after the intervention (retention rate = 83.3%). No participant dropouts occurred during the intervention and 98.6% of sessions were completed. Participants' anticipated and retrospective acceptability of the intervention was 3.2/4 (IQR, 0.5) and 3.0/4 (IQR, 0.2), respectively. There was a statistically significant increase in MVPA [Tau-U = 0.32(0.11; 0.51)] from pre- to post-intervention. CONCLUSION Despite a low recruitment rate, which could be explained by circumstances (COVID-19 pandemic), results support feasibility, acceptability, and preliminary efficacy of the TELE-Bari-ACTIV intervention for increasing MVPA in patients awaiting MBS.
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Affiliation(s)
- Aurélie Baillot
- École Interdisciplinaire de Santé, Université du Québec en Outaouais, 283 Boul. Alexandre-Taché, Gatineau, Québec, J8X 3X7, Canada.
- Institut du Savoir Montfort, Ottawa, ON, Canada.
- Centre de Recherche en Médecine Psychosociale, Centre Intégré de Santé et Services, Sociaux de L'Outaouais, Gatineau, Québec, Canada.
| | | | - Paquito Bernard
- Department of Physical Activity Sciences, Université du Québec À Montréal, Montréal, Québec, Canada
- Centre de Recherche, Institut Universitaire en Santé Mentale de Montréal, Montréal, Québec, Canada
| | - Josyanne Lapointe
- Department of Physical Activity Sciences, Université du Québec À Montréal, Montréal, Québec, Canada
- Centre de Recherche, Institut Universitaire en Santé Mentale de Montréal, Montréal, Québec, Canada
| | - Dale S Bond
- Department of Surgery, Hartford Hospital/HealthCare, Hartford, CT, USA
| | - Ahmed Jérôme Romain
- Centre de Recherche, Institut Universitaire en Santé Mentale de Montréal, Montréal, Québec, Canada
- School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Pierre Y Garneau
- Department of Surgery, Université de Montréal, Montréal, Québec, Canada
| | - Laurent Biertho
- Institut Universitaire de Cardiologie et de Pneumologie de Québec et Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - André Tchernof
- Institut Universitaire de Cardiologie et de Pneumologie de Québec et École de Nutrition, Université Laval, Québec, Québec, Canada
| | - Patricia Blackburn
- Division of Kinesiology, Department of Health Sciences, Université du Québec À Chicoutimi, Chicoutimi, Québec, Canada
| | - Marie-France Langlois
- CHUS Research Center and Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Jennifer Brunet
- Institut du Savoir Montfort, Ottawa, ON, Canada
- Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
- Cancer Therapeutic Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
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Berman DM, Lee AY, Lesurf R, Patel PG, Ebrahimizadeh W, Bayani J, Lee LA, Boufaied N, Selvarajah S, Jamaspishvili T, Guérard KP, Dion D, Kawashima A, Clarke GM, How N, Jackson CL, Scarlata E, Siddiqui K, Okello JBA, Aprikian AG, Moussa M, Finelli A, Chin J, Brimo F, Bauman G, Loblaw A, Venkateswaran V, Buttyan R, Chevalier S, Thomson A, Park PC, Siemens DR, Lapointe J, Boutros PC, Bartlett JMS. Multimodal Biomarkers That Predict the Presence of Gleason Pattern 4: Potential Impact for Active Surveillance. J Urol 2023; 210:257-271. [PMID: 37126232 DOI: 10.1097/ju.0000000000003507] [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: 04/19/2022] [Accepted: 04/20/2023] [Indexed: 05/02/2023]
Abstract
PURPOSE Latent grade group ≥2 prostate cancer can impact the performance of active surveillance protocols. To date, molecular biomarkers for active surveillance have relied solely on RNA or protein. We trained and independently validated multimodal (mRNA abundance, DNA methylation, and/or DNA copy number) biomarkers that more accurately separate grade group 1 from grade group ≥2 cancers. MATERIALS AND METHODS Low- and intermediate-risk prostate cancer patients were assigned to training (n=333) and validation (n=202) cohorts. We profiled the abundance of 342 mRNAs, 100 DNA copy number alteration loci, and 14 hypermethylation sites at 2 locations per tumor. Using the training cohort with cross-validation, we evaluated methods for training classifiers of pathological grade group ≥2 in centrally reviewed radical prostatectomies. We trained 2 distinct classifiers, PRONTO-e and PRONTO-m, and validated them in an independent radical prostatectomy cohort. RESULTS PRONTO-e comprises 353 mRNA and copy number alteration features. PRONTO-m includes 94 clinical, mRNAs, copy number alterations, and methylation features at 14 and 12 loci, respectively. In independent validation, PRONTO-e and PRONTO-m predicted grade group ≥2 with respective true-positive rates of 0.81 and 0.76, and false-positive rates of 0.43 and 0.26. Both classifiers were resistant to sampling error and identified more upgrading cases than a well-validated presurgical risk calculator, CAPRA (Cancer of the Prostate Risk Assessment; P < .001). CONCLUSIONS Two grade group classifiers with superior accuracy were developed by incorporating RNA and DNA features and validated in an independent cohort. Upon further validation in biopsy samples, classifiers with these performance characteristics could refine selection of men for active surveillance, extending their treatment-free survival and intervals between surveillance.
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Affiliation(s)
- D M Berman
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - A Y Lee
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - R Lesurf
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Now with Hospital for Sick Children, Toronto, Ontario, Canada
| | - P G Patel
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
- Now with Hospital for Sick Children, Toronto, Ontario, Canada
| | - W Ebrahimizadeh
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
- Now with IMV Inc, Dartmouth, Nova Scotia, Canada
| | - J Bayani
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathology, University of Toronto, Toronto, Ontario, Canada
| | - L A Lee
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - N Boufaied
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - S Selvarajah
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
- Now with University Health Network, Toronto, Ontario, Canada
| | - T Jamaspishvili
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - K-P Guérard
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - D Dion
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - A Kawashima
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
- Now with Osaka University, Osaka, Japan
| | - G M Clarke
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - N How
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
- Hamilton Health Sciences, Hamilton, Ontario, Canada
| | - C L Jackson
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - E Scarlata
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - K Siddiqui
- Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Now with Sultan Qaboos University Hospital, Seeb, Oman
| | - J B A Okello
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - A G Aprikian
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - M Moussa
- Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - A Finelli
- Princess Margaret Cancer Centre. Toronto, Ontario, Canada
- Departments of Surgery and Oncology, University of Toronto, Toronto, Ontario, Canada
| | - J Chin
- Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - F Brimo
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
- Department of Pathology, McGill University, Montreal, Quebec, Canada
| | - G Bauman
- Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - A Loblaw
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Departments of Radiation Oncology and Health Policy Management and Evaluation, University of Toronto, Toronto
| | - V Venkateswaran
- Departments of Surgery and Oncology, University of Toronto, Toronto, Ontario, Canada
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - R Buttyan
- Vancouver Prostate Centre, Vancouver, British Columbia, Canada
- Departments of Experimental Medicine and Interdisciplinary Oncology, Vancouver, British Columbia, Canada
| | - S Chevalier
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - A Thomson
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
- Now with College of Science and Engineering Biology, University of Edinburgh, Edinburgh, United Kingdom
| | - P C Park
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
- Now with Department of Pathology, Shared Health, Winnipeg, Manitoba, Canada
| | - D R Siemens
- Queen's University Cancer Research Institute, Kingston, Ontario, Canada
- Departments of Urology, Oncology and Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada
| | - J Lapointe
- Department of Surgery, McGill University and the Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - P C Boutros
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
- Now with University of California, Los Angeles, Los Angeles, California, United States
| | - J M S Bartlett
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathology, University of Toronto, Toronto, Ontario, Canada
- Edinburgh Cancer Research Centre, University of Edinburgh, Edinburgh, United Kingdom
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Lapointe J, Comtois AS, Romain AJ, Bernard P. The Transtheoretical model's processes of change in the heart of a physical activity intervention: A series of n-of-1. Psychol Sport Exerc 2023; 67:102430. [PMID: 37665883 DOI: 10.1016/j.psychsport.2023.102430] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 03/21/2023] [Accepted: 03/21/2023] [Indexed: 09/06/2023]
Abstract
The objectives were a) to test whether a Processes of Change (POC)-personalized Transtheoretical model (TTM)-based intervention could increase physical activity (PA) among inactive adults, and b) to examine whether the intervention increased the level of TTM theoretical constructs. The following hypotheses were formulated: 1) PA levels will be significantly higher during and after the intervention in comparison to baseline measures; 2) the level of targeted POCs will increase during the intervention; 3) non targeted POCs will stay stable, and 4) self-efficacy and decisional balance levels will increase during the intervention. A series of N-of-1 with A (1 to 2-week)-B(10-week)-A'(2-week) design were conducted with 12 inactive adults. Behavioral counselors used behavior change techniques to target TTM constructs and supervise PA. Interventions were individualized based on the 5 POCs with the lowest pre-intervention level. Device-based and subjective PA along with TTM measures were collected weekly online. PA data were analyzed with piecewise linear models. A visual analysis was run to examine the TTM constructs. Device, self-reported and TTM data were available for five, seven and five participants, respectively. A significant self-reported PA increase for six participants was found during the phase B and A2. A significant device-measured PA increase was observed in two participants during the study. A substantial increase of targeted POC from baseline for all participants with available data was observed. This study provides the first evidence of behavioral and psychological effects of a POC-personalized TTM-based intervention in inactive adults.
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Affiliation(s)
- Josyanne Lapointe
- Physical Activity Sciences Department, Université Du Québec à Montréal, Montréal, QC, Canada; Research Centre, University Institute of Mental Health in Montreal, Montreal, QC, Canada
| | - Alain-Steve Comtois
- Physical Activity Sciences Department, Université Du Québec à Montréal, Montréal, QC, Canada
| | - Ahmed-Jérôme Romain
- Research Centre, University Institute of Mental Health in Montreal, Montreal, QC, Canada; School of Kinesiology and Physical Activity Sciences, University of Montreal, Montreal, QC, Canada
| | - Paquito Bernard
- Physical Activity Sciences Department, Université Du Québec à Montréal, Montréal, QC, Canada; Research Centre, University Institute of Mental Health in Montreal, Montreal, QC, Canada.
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Mbuya-Bienge C, Kazemali C, Lapointe J, Nabi H. 397 - Revue systématique des modèles de prédiction du cancer du sein avec un score polygénique. Rev Epidemiol Sante Publique 2022. [DOI: 10.1016/j.respe.2022.06.156] [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: 10/16/2022] Open
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Lapointe J, Buron A, Mbuya-Bienge C, Nabi H. Vers un dépistage personnalisé du cancer du sein ? Perspectives des professionnels. Rev Epidemiol Sante Publique 2022. [DOI: 10.1016/j.respe.2022.06.024] [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: 10/16/2022] Open
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Baillot A, St-Pierre M, Lapointe J, Bernard P, Bond D, Romain AJ, Garneau PY, Biertho L, Tchernof A, Blackburn P, Langlois MF, Brunet J. Acceptability and feasibility of the TELEhealth BARIatric behavioural intervention to increase physical ACTIVity (TELE-BariACTIV): A single-case experimental study protocol (Preprint). JMIR Res Protoc 2022; 11:e39633. [PMID: 36173668 PMCID: PMC9562082 DOI: 10.2196/39633] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 08/23/2022] [Accepted: 08/29/2022] [Indexed: 12/04/2022] Open
Abstract
Background Regular physical activity (PA) is recommended to optimize weight and health outcomes in patients who have undergone metabolic and bariatric surgery (MBS). However, >70% of patients have low PA levels before MBS that persist after MBS. Although behavioral interventions delivered face-to-face have shown promise for increasing PA among patients who have undergone MBS, many may experience barriers, preventing enrollment into and adherence to such interventions. Delivering PA behavior change interventions via telehealth to patients who have undergone MBS may be an effective strategy to increase accessibility and reach, as well as adherence. Objective This paper reports the protocol for a study that aims to assess the feasibility and acceptability of the protocol or methods and the Telehealth Bariatric Behavioral Intervention (TELE-BariACTIV). The intervention is designed to increase moderate-to-vigorous intensity PA (MVPA) in patients awaiting bariatric surgery and is guided by a multitheory approach and a patient perspective. Another objective is to estimate the effect of the TELE-BariACTIV intervention on presurgical MVPA to determine the appropriate sample size for a multicenter trial. Methods This study is a multicenter trial using a repeated (ABAB’A) single-case experimental design. The A phases are observational phases without intervention (A1=pre-MBS phase; A2=length personalized according to the MBS date; A3=7 months post-MBS phase). The B phases are interventional phases with PA counseling (B1=6 weekly pre-MBS sessions; B2=3 monthly sessions starting 3 months after MBS). The target sample size is set to 12. Participants are inactive adults awaiting sleeve gastrectomy who have access to a computer with internet and an interface with a camera. The participants are randomly allocated to a 1- or 2-week baseline period (A1). Protocol and intervention feasibility and acceptability (primary outcomes) will be assessed by recording missing data, refusal, recruitment, retention, attendance, and attrition rates, as well as via web-based acceptability questionnaires and semistructured interviews. Data collected via accelerometry (7-14 days) on 8 occasions and via questionnaires on 10 occasions will be analyzed to estimate the effect of the intervention on MVPA. Generalization measures assessing the quality of life, anxiety and depressive symptoms, and theory-based constructs (ie, motivational regulations for PA, self-efficacy to overcome barriers to PA, basic psychological needs satisfaction and frustration, PA enjoyment, and social support for PA; secondary outcomes for a future large-scale trial) will be completed via web-based questionnaires on 6-10 occasions. The institutional review board provided ethics approval for the study in June 2021. Results Recruitment began in September 2021, and all the participants were enrolled (n=12). Data collection is expected to end in fall 2023, depending on the MBS date of the recruited participants. Conclusions The TELE-BariACTIV intervention has the potential for implementation across multiple settings owing to its collaborative construction that can be offered remotely. International Registered Report Identifier (IRRID) DERR1-10.2196/39633
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Affiliation(s)
- Aurélie Baillot
- Nursing Department, Université du Québec en Outaouais, Gatineau, QC, Canada
- Institut du savoir de l'hôpital Montfort-recherche, Ottawa, ON, Canada
- Centre de Recherche en Médecine Psychosociale, Centre Intégré de Santé et Services Sociaux de l'Outaouais, Gatineau, QC, Canada
| | - Maxime St-Pierre
- Basic Science Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Josyanne Lapointe
- Department of Physical Activity Sciences, Université du Québec à Montréal, Montréal, QC, Canada
- Montreal Mental Health University Institute Research Centre, Montreal, QC, Canada
| | - Paquito Bernard
- Department of Physical Activity Sciences, Université du Québec à Montréal, Montréal, QC, Canada
- Montreal Mental Health University Institute Research Centre, Montreal, QC, Canada
| | - Dale Bond
- Department of Surgery, Hartford Hospital/HealthCare, Hartford, CT, United States
| | - Ahmed Jérôme Romain
- Montreal Mental Health University Institute Research Centre, Montreal, QC, Canada
- School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Pierre Y Garneau
- Department of Surgery, Université de Montréal, Montréal, QC, Canada
| | - Laurent Biertho
- Institut universitaire de cardiologie et de pneumologie de Québec, Québec, QC, Canada
| | - André Tchernof
- Institut universitaire de cardiologie et de pneumologie de Québec, Québec, QC, Canada
| | - Patricia Blackburn
- Division of Kinesiology, Department of Health Sciences, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Marie-France Langlois
- CHUS Research Center and Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Jennifer Brunet
- Institut du savoir de l'hôpital Montfort-recherche, Ottawa, ON, Canada
- Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
- Cancer Therapeutic Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
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Le Page AY, de Polo A, Guérard KP, Lazaris A, Petrillo S, Ebrahimizadeh W, Tabariès S, Shinde-Jadhav S, Feldiorean A, Boufaeid N, Kassouf W, Piccirillo C, Siegel P, Aprikian A, Gregorieff A, Lapointe J, Metrakos P, Labbé D. Abstract A26: Immune profiling and organoids generation of a rare case of prostate cancer liver metastasis. Cancer Immunol Res 2020. [DOI: 10.1158/2326-6074.tumimm18-a26] [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]
Abstract
Abstract
Introduction: Prostate cancer (PCa) is the second most frequent cancer in men and a leading cause of cancer-related mortality. Despite major advances in immunotherapy, PCa remains a poor responder. Metastatic PCa is responsible for the majority of PCa-associated mortality. Most PCa metastases are multifocal and display a strong bones tropism (91.1% of cases), but PCa metastases can also spread to the lymph nodes (8.7%), lungs (5.7%), liver (4.5%) and brain (1.8%). Liver metastases are associated with worse prognosis but due to their multifocal nature and frequent spreading to other sites, PCa metastases are rarely resected. Therefore, immunologic characterization of these lesions concomitant with generation of research tools derived from these lesions are urgently needed to understand how to intercept disease progression.
Methods: A 62-year-old male who previously underwent radical prostatectomy in 2016 was diagnosed in July 2018 with a single liver metastasis (5.3 cm) by MRI. The tumor was surgically resected and tumor tissue along with peripheral blood was collected and processed for in-depth immunologic/molecular characterization and generation of tumor models. The study was done in accordance with the guidelines approved by MUHC IRB. Prior written informed consent was obtained from the subject to participate in the study (protocol: SDR-11-066).
Results: The prostatic origin of the tumor mass was confirmed by positivity for PSMA and NKX3.1 expression. Patient-derived xenografts, 2D cell and organoid cultures were generated and immunophenotyping of the innate and adaptive peripheral and tumor-infiltrating immune cells subsets was performed. Genomic alterations are currently being characterized by multiplex ligation-dependent probe amplification (MLPA). Additionally, chromatin accessibility-based characterization of the gene regulatory network of tumor luminal cells (CD49-CD26+) using the assay for transposase-accessible chromatin using sequencing (ATAC-seq) together with RNA-seq is presently under way.
Conclusions: Our collaborative effort will provide the much-needed research tools required to model and understand the processes leading to the rare, but lethal, progression from a localized PCa lesion to liver metastases. Combined with other ongoing research efforts, we believe this case will help us understand the molecular basis to the liver tropism of a subset of PCa metastases and ultimately provide biomarkers for early identification of patients with increased metastatic potential as well as a basis to determine the appropriate immunotherapy modality for metastatic patients.
Citation Format: Aurélie Y. Le Page, Anna de Polo, K-P Guérard, A. Lazaris, S.K. Petrillo, W. Ebrahimizadeh, S. Tabariès, S. Shinde-Jadhav, A. Feldiorean, N. Boufaeid, W. Kassouf, C. Piccirillo, P.M. Siegel, A. Aprikian, A. Gregorieff, J. Lapointe, P. Metrakos, D.P. Labbé. Immune profiling and organoids generation of a rare case of prostate cancer liver metastasis [abstract]. In: Proceedings of the AACR Special Conference on Tumor Immunology and Immunotherapy; 2018 Nov 27-30; Miami Beach, FL. Philadelphia (PA): AACR; Cancer Immunol Res 2020;8(4 Suppl):Abstract nr A26.
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Affiliation(s)
- Aurélie Y. Le Page
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - Anna de Polo
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - K-P Guérard
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - A. Lazaris
- 2Research Institute of the McGill University Health Centre, Department of Surgery, McGill University, Montreal, QC, Canada,
| | - S.K. Petrillo
- 2Research Institute of the McGill University Health Centre, Department of Surgery, McGill University, Montreal, QC, Canada,
| | - W. Ebrahimizadeh
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - S. Tabariès
- 3Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada,
| | - S. Shinde-Jadhav
- 4Research Institute of the McGill University Health Centre, Division of Experimental Medicine, Department of Medicine, McGill University, Montreal, QC, Canada,
| | - A. Feldiorean
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - N. Boufaeid
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - W. Kassouf
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - C. Piccirillo
- 5Research Institute of the McGill University Health Centre, The Centre of Excellence in Translational Immunology, McGill University, Department of Microbiology and Immunology, Montreal, QC, Canada,
| | - P.M. Siegel
- 3Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada,
| | - A. Aprikian
- 1Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada,
| | - A. Gregorieff
- 6Research Institute of the McGill University Health Centre, Department of Pathology, McGill University, Montreal, QC, Canada,
| | - J. Lapointe
- 7Division of Urology, Department of Surgery, Division of Experimental Medicine, Department of Medicine, Montreal, QC, Canada,
| | - P. Metrakos
- 6Research Institute of the McGill University Health Centre, Department of Pathology, McGill University, Montreal, QC, Canada,
| | - D.P. Labbé
- 8Division of Urology, Department of Surgery, McGill University, Research Institute of the McGill University Health Centre, Division of Experimental Medicine, Department of Medicine; McGill University, Goodman Cancer Research Centre; McGill University, The Centre of Excellence in Translational Immunology, Montreal, QC, Canada
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Kétilim-Novais A, Roy C, Beaulieu S, Martel-Kennes Y, Lessard M, Matte J, Lapointe J. PSX-5 Evidences of mitochondrial dysfunction and oxidative stress in newly weaned piglets. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.1073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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)
- A Kétilim-Novais
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - C Roy
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - S Beaulieu
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - Y Martel-Kennes
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - M Lessard
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - J Matte
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
| | - J Lapointe
- Agriculture et Agroalimentaire Canada / Agriculture and Agri-Food Canada,Sherbrooke, QC, Canada
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9
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Dalto DB, Lapointe J, Matte JJ. Assessment of antioxidative and selenium status by seleno-dependent glutathione peroxidase activity in different blood fractions using a pig model: issues for clinical nutrition and research. J Anim Physiol Anim Nutr (Berl) 2017; 102:184-193. [PMID: 28304104 DOI: 10.1111/jpn.12677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 07/04/2016] [Accepted: 12/18/2016] [Indexed: 01/11/2023]
Abstract
Blood seleno-dependent glutathione peroxidase (SeGPX) activity is widely used as a metabolic indicator of systemic antioxidative status despite inconsistent responses in the literature. This study aimed to compare SeGPX activity profiles in different blood fractions, expressed with different reference units, and assess their impact on interpretation of results. Two studies on selenium (Se) metabolism in gilts, including long-term and peri-oestrus SeGPX activity profiles, were submitted to analysis of variance with double repeated measures, after data set standardization. Differences between studies were experimental period (three post-pubertal oestrus or five post-pubertal oestrus +30 days of gestation) and sample type (whole blood or blood plasma). No difference was observed between whole-blood long-term profiles (three oestrus) for SeGPX activity/mg haemoglobin (SeGPXhb) vs. SeGPX activity/ml whole blood (SeGPXwb; p = 0.29). No long-term difference was observed in whole blood between profiles according to dietary Se provision (basal and dietary Se-supplemented groups; p ≥ 0.12). Blood plasma long-term profiles (five oestrus + 30 days gestation) for SeGPX/mg blood plasma protein (SeGPXpro) were different from SeGPX/ml blood plasma (SeGPXpla) according or not to Se provision (p ≤ 0.007 and p < 0.001 respectively). However, regardless of Se provision (p ≥ 0.80), when excluding gestation from the model, blood plasma profiles were similar. During the peri-oestrus period (day -4 to +3), regardless of Se provision, SeGPX activity profiles differed according to reference units in both studies (p < 0.001). However, considering Se provision, similar profiles were observed in whole blood and blood plasma (p ≥ 0.27) for basal Se groups, whereas in Se-supplemented groups they differed for both sample types (p ≤ 0.02). In conclusion, reference units influence interpretation of SeGPX activity according to physiological state. During oxidative stress periods, this effect depends upon dietary Se provision.
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Affiliation(s)
- D B Dalto
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
| | - J Lapointe
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
| | - J-J Matte
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada
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10
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Talbot G, Lessard M, Yergeau E, Gagnon N, Lo Verso L, Lapointe J, Bissonnette N, Bueno Dalto D, Ouattara B, Guay F, Matte JJ. 1744 Effects of different sources and routes of administration of copper and vitamins A and D on piglets gut microbiota. J Anim Sci 2016. [DOI: 10.2527/jam2016-1744] [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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11
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Lapointe J, Roy C, Beaudry D, Bergeron N, Blanchet I, Petit H, Palin MF. 1410 Effect of flax meal supplementation on oxidative stress and metabolic status of early lactation dairy cows infused with flax oil in the abomasum. J Anim Sci 2016. [DOI: 10.2527/jam2016-1410] [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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12
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Lo Verso L, Matte JJ, Talbot G, Lapointe J, Bissonnette N, Guay F, Gagnon N, Ouattara B, Lessard M. 1740 Effects of different sources and routes of administration of copper and vitamins A and D on gut volatile fatty acids and gene expression involved in regulation of innate and acquired immunity in piglets. J Anim Sci 2016. [DOI: 10.2527/jam2016-1740] [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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13
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Roy C, Lavoie M, Richard G, Archambault A, Lapointe J. Evidence that oxidative stress is higher in replacement gilts than in multiparous sows. J Anim Physiol Anim Nutr (Berl) 2016; 100:911-9. [PMID: 27079824 DOI: 10.1111/jpn.12462] [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] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 12/05/2015] [Indexed: 11/28/2022]
Abstract
The recent success obtained in term of increasing the litter size of sows has not correlated with a reduction of replacement rate. There is thus an increased economic demand for gilts with optimal reproductive potential and longevity. Unfortunately, replacement gilts are known to be more susceptible to diseases and less productive than multiparous sows. Interestingly, reproductive performance, resistance to diseases and longevity could all be largely affected by oxidative stress. To investigate whether oxidative stress conditions could account for the poor longevity of gilts, three distinct groups of conventional Yorkshire × Landrace sows were formed based on their similar age and parity (gilts, second parity sows as well as fourth to fifth parity sows). All animals were slaughtered during the post-ovulatory period, and blood as well as tissue samples were collected. Biomarkers of oxidative damage to proteins (carbonyls) and DNA (8-OHdG) were analysed in samples. Specific mRNA expression of major antioxidants such as glutathione peroxidases 1, 3 and 4 (GPx1, GPx3, GPx4) as well as superoxide dismutases 1 and 2 (Sod1, Sod2) were monitored in liver and kidney samples by quantitative RT-PCR. Specific enzymatic activities of both GPx and SOD were measured by spectrophotometric assays. The plasma concentration of protein carbonyls was significantly different between the three groups with the highest concentration being observed in gilts (p ≤ 0.001). The mRNA expression levels of GPx1 and GPx4 were also significantly increased in the liver of gilts when compared to multiparous sows (p ≤ 0.05). SOD2 enzymatic activity was found to be higher in the liver of gilts than multiparous sows (p ≤ 0.05). Taken together, these results indicate that replacement gilts sustain significantly higher oxidative conditions than multiparous sows. Current findings may contribute to the design of nutritional regimens that will increase the productivity of gilts by counteracting oxidative stress.
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Affiliation(s)
- C Roy
- Dairy and Swine R & D Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada
| | - M Lavoie
- Dairy and Swine R & D Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada
| | - G Richard
- Dairy and Swine R & D Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada
| | - A Archambault
- Dairy and Swine R & D Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada
| | - J Lapointe
- Dairy and Swine R & D Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada.
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14
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Matte JJ, Audet I, Ouattara B, Bissonnette N, Talbot G, Lapointe J, Guay F, Lo Verso L, Lessard M. 246 Sources and routes of administration of copper and vitamins A and D on metabolic status of these micronutrients in suckling piglets. J Anim Sci 2016. [DOI: 10.2527/msasas2016-246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Farmer C, Lapointe J, Palin MF. Effects of the plant extract silymarin on prolactin concentrations, mammary gland development, and oxidative stress in gestating gilts. J Anim Sci 2014; 92:2922-30. [PMID: 24504042 DOI: 10.2527/jas.2013-7118] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The impacts of supplementing the diet of gestating gilts twice daily with 4 g of the plant extract silymarin on circulating hormonal concentrations, oxidative status, mammary development, and mammary gene expression at the end of gestation were determined. Gilts were fed conventional diets during gestation and on d 90 they were assigned as controls (CTL; n = 16) or treated (TRT; n = 17) animals. Treatment consisted of providing 4 g of silymarin twice daily until d 110, at which time all gilts were slaughtered to collect mammary tissue for compositional analyses and measures of gene expression and oxidative status, and liver and corpora lutea for measures of oxidative stress variables. Blood samples for hormonal assays and evaluation of oxidative stress biomarkers were obtained on d 89, 94, and 109 of gestation. Silymarin increased (P = 0.05) circulating concentrations of prolactin over all samples in the repeated in time analysis. In separate analyses for each sampling time, prolactin concentrations in TRT gilts tended (P < 0.10) to be greater than in CTL gilts on d 94 of gestation. Repeated in time analysis also revealed that silymarin reduced (P ≤ 0.05) plasmatic accumulation of biomarkers of oxidative damage to protein (protein carbonyls) between d 89 and 109. There was no effect (P > 0.10) of treatment on progesterone, estradiol, leptin, or 8-hydroxy-2'-deoxyguanosine concentrations. Percent fat in mammary parenchyma was greater (P ≤ 0.05), percent protein was lesser (P ≤ 0.05), and concentrations of both RNA (P ≤ 0.01) and DNA (P < 0.05) were lesser in TRT than CTL gilts. Mammary parenchyma from TRT gilts had lower (P ≤ 0.05) mRNA abundance for STAT5A and leptin and tended to have lower (P ≤ 0.10) abundance for STAT5B than CTL gilts. Silymarin reduced (P ≤ 0.001) protein carbonyls concentrations in liver of TRT gilts. No effect of treatment was observed on antioxidant gene expression and enzymatic activities in liver samples while total superoxide dismutase activity tended to be higher (P ≤ 0.10) in the corpora lutea of TRT animals when compared with CTL. This is the first demonstration that, in female pigs, silymarin can increase prolactin concentrations and protect against oxidative stress, yet the increase in prolactin was not enough to have beneficial effects on mammary gland development in late gestation.
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Affiliation(s)
- C Farmer
- Agriculture and Agri-Food Canada, Dairy and Swine R & D Centre, 2000 College St., Sherbrooke, QC J1M 0C8, Canada
| | - J Lapointe
- Agriculture and Agri-Food Canada, Dairy and Swine R & D Centre, 2000 College St., Sherbrooke, QC J1M 0C8, Canada
| | - M-F Palin
- Agriculture and Agri-Food Canada, Dairy and Swine R & D Centre, 2000 College St., Sherbrooke, QC J1M 0C8, Canada
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16
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Lapointe J. Mitochondria as promising targets for nutritional interventions aiming to improve performance and longevity of sows. J Anim Physiol Anim Nutr (Berl) 2014; 98:809-21. [DOI: 10.1111/jpn.12160] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 12/05/2013] [Indexed: 12/11/2022]
Affiliation(s)
- J. Lapointe
- Dairy and Swine R & D Centre; Agriculture and Agri-Food Canada; Sherbrooke QC Canada
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17
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Janz S, Xu DX, Vachon M, Sabourin N, Cheben P, McIntosh H, Ding H, Wang S, Schmid JH, Delâge A, Lapointe J, Densmore A, Ma R, Sinclair W, Logan SM, Mackenzie R, Liu QY, Zhang D, Lopinski G, Mozenson O, Gilmour M, Tabor H. Photonic wire biosensor microarray chip and instrumentation with application to serotyping of Escherichia coli isolates. Opt Express 2013; 21:4623-4637. [PMID: 23481995 DOI: 10.1364/oe.21.004623] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A complete photonic wire molecular biosensor microarray chip architecture and supporting instrumentation is described. Chip layouts with 16 and 128 independent sensors have been fabricated and tested, where each sensor can provide an independent molecular binding curve. Each sensor is 50 μm in diameter, and consists of a millimeter long silicon photonic wire waveguide folded into a spiral ring resonator. An array of 128 sensors occupies a 2 × 2 mm2 area on a 6 × 9 mm2 chip. Microfluidic sample delivery channels are fabricated monolithically on the chip. The size and layout of the sensor array is fully compatible with commercial spotting tools designed to independently functionalize fluorescence based biochips. The sensor chips are interrogated using an instrument that delivers sample fluid to the chip and is capable of acquiring up to 128 optical sensor outputs simultaneously and in real time. Coupling light from the sensor chip is accomplished through arrays of sub-wavelength surface grating couplers, and the signals are collected by a fixed two-dimensional detector array. The chip and instrument are designed so that connection of the fluid delivery system and optical alignment are automated, and can be completed in a few seconds with no active user input. This microarray system is used to demonstrate a multiplexed assay for serotyping E. coli bacteria using serospecific polyclonal antibody probe molecules.
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Affiliation(s)
- S Janz
- National Research Council Canada (NRC), Ottawa, Ontario, K1A 0R6, Canada.
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18
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Laroche E, Turgeon AF, Boutin A, Mercier E, Lauzier F, Zarychanski R, Moore L, Granton J, Archambault P, Lamontagne F, Rousseau F, Légaré F, Randell E, Lapointe J, Lacroix J, Fergusson D. Predictive value of glial fibrillary acidic protein for prognosis in patients with moderate and severe traumatic brain injury: a systematic review and meta-analysis. Crit Care 2012. [PMCID: PMC3363716 DOI: 10.1186/cc10905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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19
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Mercier E, Turgeon AF, Boutin A, Lauzier F, Zarychanski R, Archambault P, Granton J, Lamontagne F, Moore L, Rousseau F, Légaré F, Randell E, Lacroix J, Lapointe J, Fergusson D. Predictive value of neuron-specific enolase following moderate and severe traumatic brain injury: a systematic review and meta-analysis. Crit Care 2012. [PMCID: PMC3363729 DOI: 10.1186/cc10918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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20
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Abstract
The interplay between crystal phase purity and radial growth in InP nanowires is investigated. By modifying the growth rate and V/III ratio, regions of high or low stacking fault density can be controllably introduced into wurtzite nanowires. It is found that regions with high stacking fault density encourage radial growth. Through careful choice of growth conditions pure wurtzite InP nanowires are then grown which exhibit narrow 4.2 K photoluminescence linewidths of 3.7 meV at 1.490 meV, and no evidence of emission related to stacking faults or zincblende insertions.
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Affiliation(s)
- P J Poole
- National Research Council Canada, Ottawa, Canada.
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21
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Kao R, Rajagopalan A, Beckett A, Beckett A, Rex R, Shah S, Waddell J, Boitano M, Faidi S, Babatunde O, Lawson F, Grant A, Sudarshan M, Sudarshan M, Takashashi M, Waggott M, Lampron J, Post A, Beale E, Bobrovitz N, Zakrison T, Smith A, Bawazeer M, Evans C, Leeper T, Kagedan D, Grenier T, Rezendo-Neto J, Roberts D, Roberts D, Stark P, Berg R, Mehta S, Gardner P, Moore L, Vassilyadi M, Moore L, Moore L, Hoshizaki B, Rezende-Neto J, Slaba I, Ramesh A, Grigorovich A, Parry N, Pajak C, Rosenbloom B, Grunfeld A, van Heest R, Fernandes J, Doucet J, Schooler S, Ali J, Klassen B, Santana M, McFarlan A, Ball C, Blackmore C, Rezende-Neto J, Kidane B, Hicks C, Brennan M, Brennan M, Harrington A, Sorvari A, Stewart TC, Biegler N, Chaubey V, Tsang B, Benjamin S, Hogan A, Fraser J, Martin M, Bridge J, Faidi S, Waligora M, Hsiao M, Sharma S, Sankarankutty A, Mckee J, Mckee J, Mckee J, Snider C, Szpakowski J, Brown R, Shah S, Shiu M, Chen M, Bell N, Besserer F, Bell N, Trudeau MO, Alhabboubi M, Rezende-Neto J, Rizoli S, Hill A, Joseph B, Lawless B, Jiao X, Xenocostas A, Rui T, Parry N, Driman D, Martin C, Stewart TC, Walsh J, Parry N, Merritt N, Elster E, Tien H, Phillips L, Bratu I, Nascimento B, Pinto R, Callum J, Tien H, Rizoli S, McMullan J, McGlasson R, Mahomed N, Flannery J, Bir C, Baillie F, Coates A, Asiri S, Foster P, Baillie F, Bhandari M, Phillips L, Bratu I, Schuurman N, Oliver L, Nathens A, Yazdani A, Alhabboubi M, St. Louis E, Tan X, Fata P, Deckelbaum D, Chughtai T, Razek T, Khwaja K, St. Louis E, Alhabboubi M, Tan X, Fata P, Deckelbaum D, Chughtai T, Razek T, Khwaja K, Takada M, Sawano M, Ito H, Tsutsumi H, Keenan A, Waggott M, Hoshizaki B, Brien S, Gilchrist M, Janis J, Phelan H, Minei J, Santana M, Stelfox H, McCredie V, Leung E, Garcia G, Rizoli S, Nathens A, Dixon E, Niven D, Kirkpatrick A, Feliciano D, D’Amours S, Ball C, Ahmed N, Izadi H, McFarlan A, Nathens A, Pavenski K, Nathens A, Bridge J, Tallon J, Leeper W, Vogt K, Stewart TC, Gray D, Parry N, Ameer A, Alhabboubi M, Alzaid S, Deckelbaum D, Fata P, Khwaja K, Razek T, Deckelbaum D, Drudi L, Boulva K, Rodrigue N, Khwaja K, Chughtai T, Fata P, Razek T, Rizoli S, Carreiro P, Lisboa T, Winter P, Ribeiro E, Cunha-Melo J, Andrade M, Zygun D, Grendar J, Ball C, Robertson H, Ouellet JF, Cheatham M, Kirkpatrick A, Ball C, Ouellet JF, McBeth P, Kirkpatrick A, Dixon E, Groff P, Inaba K, Okoye O, Pasley J, Demetriades D, Al-Harthi F, Cheng A, Lalani A, Mikrogianakis A, Cayne S, Knittel-Keren D, Gomez M, Stelfox H, Turgeon A, Lapointe J, Bourgeois G, Karton C, Rousseau P, Hoshizaki B, Stelfox H, Turgeon A, Bourgeois G, Lapointe J, Stelfox H, Turgeon A, Bourgeois G, Lapointe J, Rousseau P, Braga B, Faleiro R, Magaldi M, Cardoso G, Lozada W, Duarte L, Rizoli S, Ball C, Oddone-Paolucci E, Doig C, Kortbeek J, Gomez M, Fish J, Leach L, Leelapattana P, Fleming J, Bailey C, Nolan B, DeMestral C, McFarlan A, Zakirova R, Nathens A, Dabbs J, Duff D, Michalak A, Mitchell L, Nathens A, Singh M, Topolovec-Vranic J, Tymianski D, Yetman L, Canzian S, MacPhail I, Constable L, van Heest R, Tam A, Mahadevan P, Kim D, Bansal V, Casola G, Coimbra R, Gladwin C, Misra M, Kumar S, Gautam S, Sorvari A, Blackwood B, Coates A, Baillie F, Stelfox H, Nathens A, Wong C, Straus S, Haas B, Lenartowicz M, Parkovnick M, Parry N, Inaba K, Dixon E, Salim A, Pasley J, Kirkpatrick A, Ouellet JF, Niven D, Kirkpatrick A, Ball C, Neto C, Nogueira G, Fernandes M, Almeida T, de Abreu EMS, Rizoli S, Abrantes W, Taranto V, Parry N, Forbes T, Knight H, Keenan A, Yoxon H, Macpherson A, Bridge J, Topolovec-Vranic J, Mauceri J, Butorac E, Ahmed N, Holmes J, Gilliland J, Healy M, Tanner D, Polgar D, Fraser D, McBeth P, Crawford I, Tiruta C, Ball C, Kirkpatrick A, Roberts D, Ferri M, Bobrovitz N, Khandwala F, Stelfox H, Widder S, Mckee J, Hogan A, Benjamin S, Atkinson P, Benjamin S, Watson I, Hogan A, Benjamin S, Woodford S, Jaramillo DG, Nathens A, Alonazi N, Coates A, Baillie F, Zhang C, McFarlan A, Sorvari A, Chalklin K, Canzian S, Nathens A, DeMestral C, Hill A, Langer J, Nascimento B, Alababtain I, Fung SY, Passos E, Luz L, Brnjac E, Pinto R, Rizoli S, Widder S, Widder S, Widder S, Nathens A, Van Heest R, Constable L, Mancini F, Heidary B, Bell N, Appleton L, Hennecke P, Taunton J, Khwaja K, O’Connor M, Hameed M, Garraway N, Simons R, Evans D, Taulu T, Quinn L, Kuipers D, Rizoli S, Rogers C, Geerts W, Rhind S, Rizoli S, George K, Quinn L, Babcock C, Hameed M, Simons R, Caron N, Hameed M, Simons R, Prévost F, Razek T, Khwaja K, Sudarshan M, Razek T, Fata P, Deckelbaum D, Khwaja K, de Abreu EMS, Neto C, Almeida T, Pastore M, Taranto V, Fernandes M, Rizoli S, Nascimento B, Sankarankutty A, Pinto R, Callum J, Tremblay L, Tien H, Fowler R, Pinto R, Nathens A, Sadoun M, Harris J, Friese R, Kulvantunyou N, O’Keeffe T, Wynne J, Tang A, Green D, Rhee P, Trpkovski J, Blount V. Trauma Association of Canada Annual Scientific Meeting abstractsErythroopoietin resuscitated with normal saline, Ringer’s lactate and 7.5% hypertonic saline reduces small intestine injury in a hemorrhagic shock and resuscitation rat model.Analgesia in the management of pediatric trauma in the resuscitative phase: the role of the trauma centre.Multidisciplinary trauma team care in Kandahar, Afghanistan: current injury patterns and care practices.Does computed tomography for penetrating renal injury reduce renal exploration? An 8-year review at a Canadian level 1 trauma centre.The other side of pediatric trauma: violence and intent injury.Upregulation of activated protein C leads to factor V deficiency in early trauma coagulopathy.A provincial integrated model of improved care for patients following hip fracture.Sports concussion: an Olympic boxing model comparing sex with biomechanics and traumatic brain injury.A multifaceted quality improvement strategy to optimize monitoring and management of delirium in trauma patients: results of a clinician survey.Risk factors for severe all-terrain vehicle injuries in Alberta.Evaluating potential spatial access to trauma centre care by severely injured patients.Incidence of brain injury in facial fractures.Surgical outcomes and the acute care surgery service.The acute care general surgery population and prognostic factors for morbidity and mortality.Disaster preparedness of trauma.What would you like to know and how can we help you? Assessing the needs of regional trauma centres.Posttraumatic stress disorder screening for trauma patients at a level 1 trauma centre.Physical and finite element model reconstruction of a subdural hematoma event.Abdominal wall reconstruction in the trauma patient with an open abdomen.Development and pilot testing of a survey to measure patient and family experiences with injury care.Occult shock in trauma: What are Canadian traumatologists missing?Timeliness in obtaining emergent percutaneous procedures for the severely injured patient: How long is too long?97% of massive transfusion protocol activations do not include a complete hemorrhage panel.Trauma systems in Canada: What system components facilitate access to definitive care?The role of trauma team leaders in missed injuries: Does specialty matter?The adverse consequences of dabigatran among trauma and acute surgical patients.A descriptive study of bicycle helmet use in Montréal.Factor XIII, desmopressin and permissive hypotension enhance clot formation compared with normotensive resuscitation: uncontrolled hemorrhagic shock model.Negative pressure wound therapy for critically ill adults with open abdominal wounds: a systematic review.The “weekend warrior:” Fact or fiction for major trauma?Canadian injury preventon curriculum: a means to promote injury prevention.Penetrating splenic trauma: Safe for nonoperative management?The pediatric advanced trauma life support course: a national initiative.The effectiveness of a psycho-educational program among outpatients with burns or complex trauma.Trauma centre performance indicators for nonfatal outcomes: a scoping review.The evaluation of short track speed skating helmet performance.Complication rates as a trauma care performance indicator: a systematic review.Unplanned readmission following admission for traumatic injury: When, where and why?Reconstructions of concussive impacts in ice hockey.How does head CT correlate with ICP monitoring and impact monitoring discontinuation in trauma patients with a Marshall CT score of I–II?Impact of massive transfusion protocol and exclusion of plasma products from female donors on outcome of trauma patients in Calgary region of Alberta Health Services.Primary impact arthrodesis for a neglected open Weber B ankle fracture dislocation.Impact of depression on neuropsychological functioning in electrical injury patients.Predicting the need for tracheostomy in patients with cervical spinal cord injury.Predicting crumping during computed tomography imaging using base deficit.Feasibility of using telehomecare technology to support patients with an acquired brain injury and family care-givers.Program changes impact the outcomes of severely injured patients.Do trauma performance indicators accurately reflect changes in a maturing trauma program?One-stop falls prevention information for clinicians: a multidisciplinary interactive algorithm for the prevention of falls in older adults.Use of focused assessment with sonography for trauma (FAST) for combat casualties in forward facilities.Alberta All-terrain Vehicle Working Group: a call to action.Observations and potential role for the rural trauma team development course (RTTDC) in India.An electronic strategy to facilitate information-sharing among trauma team leaders.Development of quality indicators of trauma care by a consensus panel.An evaluation of a proactive geriatric trauma consultation service.Celebrity injury-related deaths: Is a gangster rapper really gangsta?Prevention of delirium in trauma patients: Are we giving thiamine prophylaxis a fair chance?Intra-abdominal injury in patients who sustain more than one gunshot wound to the abdomen: Should non-operative management be used?Retrospective review of blunt thoracic aortic injury management according to current treatment recommendations.Telemedicine for trauma resuscitation: developing a regional system to improve access to expert trauma care in Ontario.Comparing trauma quality indicator data between a pediatric and an adult trauma hospital.Using local injury data to influence injury prevention priorities.Systems saving lives: a structured review of pediatric trauma systems.What do students think of the St. Michael’s Hospital ThinkFirst Injury Prevention Strategy for Youth?An evidence-based method for targeting a shaken baby syndrome prevention media campaign.The virtual mentor: cost-effective, nurse-practitioner performed, telementored lung sonography with remote physician guidance.Quality indicators used by teaching versus nonteaching international trauma centres.Compliance to advanced trauma life support protocols in adult trauma patients in the acute setting.Closing the quality improvement loop: a collaborative approach.National Trauma Registry: “collecting” it all in New Brunswick.Does delay to initial reduction attempt affect success rates for anterior shoulder dislocation (pilot study)?Use of multidisciplinary, multi-site morbidity and mortality rounds in a provincial trauma system.Caring about trauma care: public awareness, knowledge and perceptions.Assessing the quality of admission dictation at a level 1 trauma centre.Trauma trends in older adults: a decade in review.Blunt splenic injury in patients with hereditary spherocytosis: a population-based analysis.Analysis of trauma team activation in severe head injury: an institutional experience.ROTEM results correlate with fresh frozen plasma transfusion in trauma patients.10-year trend of assault in Alberta.10-year trend in alcohol use in major trauma in Alberta.10-year trend in major trauma injury related to motorcycles compared with all-terrain vehicles in Alberta.Referral to a community program for youth injured by violence: a feasibility study.New impaired driving laws impact on the trauma population at level 1 and 3 trauma centres in British Columbia, Canada.A validation study of the mobile medical unit/polyclinic team training for the Vancouver 2010 Winter Games.Inferior vena cava filter use in major trauma: the Sunny-brook experience, 2000–2011.Relevance of cellular microparticles in trauma-induced coagulopathy: a systemic review.Improving quality through trauma centre collaboratives.Predictors of acute stress response in adult polytrauma patients following injury.Patterns of outdoor recreational injury in northern British Columbia.Risk factors for loss-to-follow up among trauma patients include functional, socio-economic, and geographic determinants: Would mandating opt-out consent strategies minimize these risks?Med-evacs and mortality rates for trauma from Inukjuak, Nunavik, Quebec.Review of open abdomens in McGill University Health Centre.Are surgical interventions for trauma associated with the development of posttraumatic retained hemothorax and empyema?A major step in understanding the mechanisms of traumatic coagulopathy: the possible role of thrombin activatable fibrinolysis inhibitor.Access to trauma centre care for patients with major trauma.Repeat head computed tomography in anticoagulated traumatic brain injury patients: still warranted.Improving trauma system governance. Can J Surg 2012. [DOI: 10.1503/cjs.006312] [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: 11/01/2022] Open
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22
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Mnaymneh K, Frédérick S, Dalacu D, Lapointe J, Poole PJ, Williams RL. Enhanced photonic crystal cavity-waveguide coupling using local slow-light engineering. Opt Lett 2012; 37:280-282. [PMID: 22854493 DOI: 10.1364/ol.37.000280] [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] [Indexed: 06/01/2023]
Abstract
This Letter introduces an enhanced cavity-waveguide coupling architecture based upon slow-light engineering in a two-port photonic crystal system. After analyzing the system transmittance using coupled-mode theory, the system is probed experimentally and shown to have increased transmittance due to the enhanced cavity-waveguide coupling. Such a coupling architecture may facilitate next-generation planar lightwave circuitry such as onchip quantum information processing or high precision light-matter sensing applications.
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Affiliation(s)
- K Mnaymneh
- Department of Physics, University of Ottawa, Ottawa, Canada.
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23
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Huang S, Gulzar ZG, Salari K, Lapointe J, Brooks JD, Pollack JR. Recurrent deletion of CHD1 in prostate cancer with relevance to cell invasiveness. Oncogene 2011; 31:4164-70. [PMID: 22179824 DOI: 10.1038/onc.2011.590] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Though prostate cancer is often indolent, it is nonetheless a leading cause of cancer death. Defining the underlying molecular genetic alterations may lead to new strategies for prevention or treatment. Towards this goal, we performed array-based comparative genomic hybridization (CGH) on 86 primary prostate tumors. Among the most frequent alterations not associated with a known cancer gene, we identified focal deletions within 5q21 in 15 out of 86 (17%) cases. By high-resolution tiling array CGH, the smallest common deletion targeted just one gene, the chromatin remodeler chromodomain helicase DNA-binding protein 1 (CHD1). Expression of CHD1 was significantly reduced in tumors with deletion (P=0.03), and compared with normal prostate (P=0.04). Exon sequencing analysis also uncovered nonsynonymous mutations in 1 out of 7 (14%) cell lines (LAPC4) and in 1 out of 24 (4%) prostate tumors surveyed. RNA interference-mediated knockdown of CHD1 in two nontumorigenic prostate epithelial cell lines, OPCN2 and RWPE-1, did not alter cell growth, but promoted cell invasiveness, and in OPCN2-enhanced cell clonogenicity. Taken together, our findings suggest that CHD1 deletion may underlie cell invasiveness in a subset of prostate cancers, and indicate a possible novel role of altered chromatin remodeling in prostate tumorigenesis.
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Affiliation(s)
- S Huang
- Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305-5176, USA
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24
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Schmid JH, Ibrahim M, Cheben P, Lapointe J, Janz S, Bock PJ, Densmore A, Lamontagne B, Ma R, Ye WN, Xu DX. Temperature-independent silicon subwavelength grating waveguides. Opt Lett 2011; 36:2110-2112. [PMID: 21633465 DOI: 10.1364/ol.36.002110] [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] [Indexed: 05/30/2023]
Abstract
We demonstrate, by experiment and numerical calculations, temperature-independent subwavelength grating waveguides with a periodic composite core composed of alternating regions of silicon and SU-8 polymer. The polymer has a negative thermo-optic (TO) material coefficient that cancels the large positive TO effect of the silicon. Measurements and Bloch mode calculations were carried out over a range of silicon-polymer duty ratios. The lowest measured TO coefficient at a wavelength of 1550 nm is 1.8×10(-6) K(-1); 2 orders of magnitude smaller than a conventional silicon photonic wire waveguide. Calculations predict the possibility of complete cancellation of the silicon waveguide temperature dependence.
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Affiliation(s)
- J H Schmid
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada. jens.schmid@nrc‐cnrc.gc.ca
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25
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Xu DX, Vachon M, Densmore A, Ma R, Janz S, Delâge A, Lapointe J, Cheben P, Schmid JH, Post E, Messaoudène S, Fédéli JM. Real-time cancellation of temperature induced resonance shifts in SOI wire waveguide ring resonator label-free biosensor arrays. Opt Express 2010; 18:22867-22879. [PMID: 21164626 DOI: 10.1364/oe.18.022867] [Citation(s) in RCA: 14] [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] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A comprehensive investigation of real-time temperature-induced resonance shift cancellation for silicon wire based biosensor arrays is reported for the first time. A reference resonator, protected by either a SU8 or SiO(2) cladding layer, is used to track temperature changes. The temperature dependence of resonators in aqueous solutions, pertinent to biosensing applications, is measured under steady-state conditions and the operating parameters influencing these properties are discussed. Real-time measurements show that the reference resonator resonances reflect the temperature changes without noticeable time delay, enabling effective cancellation of temperature-induced shifts. Binding between complementary IgG protein pairs is monitored over 4 orders of magnitude dynamic range down to a concentration of 20 pM, demonstrating a resolvable mass of 40 attograms. Reactions are measured over time periods as long as 3 hours with high stability, showing a scatter corresponding to a fluid refractive index fluctuation of ± 4 × 10(-6) in the baseline data. Sensor arrays with a SU8 protective cladding are easy to fabricate, while oxide cladding is found to provide superior stability for measurements involving long time scales.
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Affiliation(s)
- D-X Xu
- Institute for Microstructural Sciences, National Research Council Canada, 1200 Montreal Rd, Ottawa, Ontario K1A 0R6, Canada.
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26
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Halir R, Cheben P, Schmid JH, Ma R, Bedard D, Janz S, Xu DX, Densmore A, Lapointe J, Molina-Fernández I. Continuously apodized fiber-to-chip surface grating coupler with refractive index engineered subwavelength structure. Opt Lett 2010; 35:3243-5. [PMID: 20890347 DOI: 10.1364/ol.35.003243] [Citation(s) in RCA: 17] [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] [Indexed: 05/25/2023]
Abstract
We demonstrate a fully etched, continuously apodized fiber-to-chip surface grating coupler for the first time (to our knowledge). The device is fabricated in a single-etch step and operates with TM-polarized light, achieving a coupling efficiency of 3.7 dB and a 3 dB bandwidth of 60 nm. A subwavelength microstructure is employed to generate an effective medium engineered to vary the strength of the grating and thereby maximize coupling efficiency, while mitigating backreflections at the same time. Minimum feature size is 100 nm for compatibility with deep-UV 193 nm lithography.
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Affiliation(s)
- R Halir
- Departamento Ingeniería de Comunicaciones, ETSI Telecomunicación, Universidad de Málaga, 29010 Málaga, Spain.
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Abstract
AIM To design and demonstrate dynamic pupils, which react to light for use with ocular prostheses. METHODS The realism of ocular prostheses is limited by the immobility of the pupil. Our solution is to use a liquid crystal display (LCD) in the prosthesis to vary the pupil size as a function of the ambient light. Several liquid crystal cells were fabricated and tested for survivability through the ocular prosthesis manufacturing process. The dynamic pupil is controlled by a novel and entirely autonomous, self-powered passive electronic circuit using a solar cell, matching the minimum diameter of the pupil. RESULTS The first LCD surviving the rugged conditions of the ocular prosthesis manufacturing steps and an entirely passive circuit controlling the pupil have been demonstrated for the first time to our knowledge. A design for a complete prosthesis with a dynamic pupil has been proposed. Finally, a standard device for the mass production of ocular prostheses is presented. CONCLUSION We have shown that a practical solution for an autonomous self-powered dynamic pupil is possible, given the constraints of size, fabrication process, weight, cost and manufacturability on a mass scale. We envision that the LCD could be mass produced, and only the final steps for the integration of the iris matched to a patient would be necessary before assembly using standard processing steps for the production of the prosthesis. Using a clinical trial, we hope to demonstrate that the dynamic pupil will have a positive impact on the quality of life of patients.
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Affiliation(s)
- J Lapointe
- Department of Engineering Physics, Advanced Photonics Concepts Laboratory, Ecole Polytechnique de Montreal, Montreal, Quebec, Canada.
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Lavoie A, Moore L, Murat V, Bamvita JM, Lapointe J, Bourgeois G. Using accreditation reports to measure performance: from expectations to reality. Inj Prev 2010. [DOI: 10.1136/ip.2010.029215.547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Lavoie A, Moore L, Murat V, Bamvita JM, Lapointe J, Bourgeois G. Development of a standardised evaluation grid for trauma center accreditation process. Inj Prev 2010. [DOI: 10.1136/ip.2010.029215.553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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30
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Lapointe J, Abdousa B, Camdem S, Bouchard K, Simard D, Dorval M. Effet de plan dans la mesure de variables psychosociales chez les familles canadiennes–françaises à haut risque de cancer héréditaire du sein et de l’ovaire, Québec, Canada, 2010. Rev Epidemiol Sante Publique 2010. [DOI: 10.1016/j.respe.2010.06.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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31
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Xu DX, Vachon M, Densmore A, Ma R, Delâge A, Janz S, Lapointe J, Li Y, Lopinski G, Zhang D, Liu QY, Cheben P, Schmid JH. Label-free biosensor array based on silicon-on-insulator ring resonators addressed using a WDM approach. Opt Lett 2010; 35:2771-2773. [PMID: 20717452 DOI: 10.1364/ol.35.002771] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report a silicon-on-insulator ring resonator biosensor array with one output port, using wavelength division multiplexing as the addressing scheme. With the use of on-chip referencing for environmental drift cancellation, simultaneous monitoring of multiplexed molecular bindings is demonstrated, with a resolution of 0.3 pg/mm(2) (40 ag of total mass) for protein concentrations over 4 orders of magnitude down to 20 pM. Reactions are measured over time periods as long as 3 h with high stability.
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Affiliation(s)
- D-X Xu
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada, K1A 0R6.
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32
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Densmore A, Vachon M, Xu DX, Janz S, Ma R, Li YH, Lopinski G, Delâge A, Lapointe J, Luebbert CC, Liu QY, Cheben P, Schmid JH. Silicon photonic wire biosensor array for multiplexed real-time and label-free molecular detection. Opt Lett 2009; 34:3598-600. [PMID: 19953132 DOI: 10.1364/ol.34.003598] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We demonstrate a silicon photonic wire waveguide biosensor array chip for the simultaneous monitoring of different molecular binding reactions. The chip is compatible with automated commercial spotting tools and contains a monolithically integrated microfluidic channel for sample delivery. Each array sensor element is a 1.8-mm-long spiral waveguide folded within a 130 microm diameter spot and is incorporated in a balanced Mach-Zehnder interferometer with a near temperature independent response. The sensors are arranged in a 400 microm spacing grid pattern and are addressed through cascaded 1x2 optical power splitters using light from a single input fiber. We demonstrate the real-time monitoring of antibody-antigen reactions using complementary and mismatched immunoglobulin G receptor-analyte pairs and bovine serum albumin. The measured level of detection for each sensor element corresponds to a surface coverage of less than 0.3 pg/mm(2).
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Affiliation(s)
- A Densmore
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada K1A 0R6.
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33
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Schmid JH, Sinclair W, García J, Janz S, Lapointe J, Poitras D, Li Y, Mischki T, Lopinski G, Cheben P, Delâge A, Densmore A, Waldron P, Xu DX. Silicon-on-insulator guided mode resonant grating for evanescent field molecular sensing. Opt Express 2009; 17:18371-18380. [PMID: 19907628 DOI: 10.1364/oe.17.018371] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present experimental and theoretical results of label-free molecular sensing using the transverse magnetic mode of a 0.22 mum thick silicon slab waveguide with a surface grating implemented in a guided mode resonance configuration. Due to the strong overlap of the evanescent field of the waveguide mode with a molecular layer attached to the surface, these sensors exhibit high sensitivity, while their fabrication and packaging requirements are modest. Experimentally, we demonstrate a resonance wavelength shift of approximately 1 nm when a monolayer of the protein streptavidin is attached to the surface, in good agreement with calculations based on rigorous coupled wave analysis. In our current optical setup this shift corresponds to an estimated limit of detection of 0.2% of a monolayer of streptavidin.
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Affiliation(s)
- J H Schmid
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, K1A 0R6.
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Marcos B, Lundgren K, Boily A, Thérien L, Lapointe J, Veillette M. THERMEX: An Educational Expert System for Thermodynamics Students. CJLT / RCAT 2009. [DOI: 10.21432/t22g73] [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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35
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Schmid JH, Cheben P, Lapointe J, Janz S, Delâge A, Densmore A, Xu DX. High reflectivity gratings on silicon-on-insulator waveguide facets. Opt Express 2008; 16:16481-16488. [PMID: 18852755 DOI: 10.1364/oe.16.016481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Accepted: 09/23/2008] [Indexed: 05/26/2023]
Abstract
We demonstrate by numerical simulations and experiments that highly reflective (HR) facets can be formed on silicon waveguides with high reflectivity diffraction gratings. We use an HR grating with a plane wave reflectivity exceeding 99.99%, as calculated by rigorous coupled wave analysis. Experimentally, we demonstrate the HR effect for silicon-on-insulator waveguide facets patterned lithographically with grating structures. Due to a strong mode size dependence, the maximum facet reflectivity for 1.5 microm thick waveguide is 77%, but finite difference time-domain simulations show that modal reflectivies larger than 90% can be achieved for silicon waveguides with thicknesses of 4 microm or more.
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Affiliation(s)
- J H Schmid
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada.
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36
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Poitras J, Maire S, Tanguay A, Lapointe J, Hebert D. 170: Delays to Angioplasty for Patients With ST-Elevation Myocardial Infarction are Reducible by Ambulance Diversion Based on a Out-of-Hospital Electrocardiogram. Ann Emerg Med 2008. [DOI: 10.1016/j.annemergmed.2008.06.187] [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: 11/25/2022]
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37
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Xu DX, Densmore A, Delâge A, Waldron P, McKinnon R, Janz S, Lapointe J, Lopinski G, Mischki T, Post E, Cheben P, Schmid JH. Folded cavity SOI microring sensors for high sensitivity and real time measurement of biomolecular binding. Opt Express 2008; 16:15137-48. [PMID: 18795053 DOI: 10.1364/oe.16.015137] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate folded waveguide ring resonators for biomolecular sensing. We show that extending the ring cavity length increases the resonator quality factor, and thereby enhances the sensor resolution and minimum level of detection, while at the same time relaxing the tolerance on the coupling conditions to provide stable and large resonance contrast. The folded spiral path geometry allows a 1.2 mm long ring waveguide to be enclosed in a 150 microm diameter sensor area. The spiral cavity resonator is used to monitor the streptavidin protein binding with a detection limit of approximately 3 pg/mm(2), or a total mass of approximately 5 fg. The real time measurements are used to analyze the kinetics of biotin-streptavidin binding.
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Affiliation(s)
- D X Xu
- Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario, Canada.
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38
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Schmid JH, Delâge A, Lamontagne B, Lapointe J, Janz S, Cheben P, Densmore A, Waldron P, Xu DX, Yap KP. Interference effect in scattering loss of high-index-contrast planar waveguides caused by boundary reflections. Opt Lett 2008; 33:1479-1481. [PMID: 18594671 DOI: 10.1364/ol.33.001479] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present theoretical and experimental results on an interference effect caused by boundary reflections on the optical scattering loss in high-index-contrast planar waveguides. Analytical expressions for the polarization-dependent scattering loss are derived using a surface Green's function. For high-index-contrast waveguides of submicrometer dimensions a significant deviation from accepted theory arises, including scattering loss suppression owing to a thin-film interference effect. Our theoretical predictions are confirmed by loss measurements on silicon-on-insulator channel waveguides.
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Affiliation(s)
- J H Schmid
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada.
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39
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Densmore A, Xu DX, Janz S, Waldron P, Mischki T, Lopinski G, Delâge A, Lapointe J, Cheben P, Lamontagne B, Schmid JH. Spiral-path high-sensitivity silicon photonic wire molecular sensor with temperature-independent response. Opt Lett 2008; 33:596-598. [PMID: 18347721 DOI: 10.1364/ol.33.000596] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We demonstrate a new silicon photonic wire waveguide evanescent field (PWEF) sensor that exploits the strong evanescent field of the transverse magnetic mode of this high-index-contrast, submicrometer-dimension waveguide. High sensitivity is achieved by using a 2 mm long double-spiral waveguide structure that fits within a compact circular area of 150 microm diameter, facilitating compatibility with commercial spotting apparatus and the fabrication of densely spaced sensor arrays. By incorporating the PWEF sensor element into a balanced waveguide Mach-Zehnder interferometer circuit, a minimum detectable mass of approximately 10 fg of streptavidin protein is demonstrated with near temperature-independent response.
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Affiliation(s)
- A Densmore
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada, K1A 0R6.
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40
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Schmid JH, Cheben P, Janz S, Lapointe J, Post E, Xu DX. Gradient-index antireflective subwavelength structures for planar waveguide facets. Opt Lett 2007; 32:1794-6. [PMID: 17603572 DOI: 10.1364/ol.32.001794] [Citation(s) in RCA: 8] [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] [Indexed: 05/16/2023]
Abstract
We demonstrate the use of subwavelength gratings etched into the facets of silicon-on-insulator ridge waveguides as a means of reducing facet reflectivity by the gradient-index effect. Reflectivities as low as 2.0% and 2.4% for the fundamental TE and TM modes, respectively, are demonstrated experimentally for light of 1.55 microm wavelength, in agreement with both effective medium theory and finite-difference time domain calculations. Simulations show that facet reflectivites can be further reduced to less than 1% by increasing the grating modulation depth.
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Affiliation(s)
- J H Schmid
- Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.
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41
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Cheben P, Schmid JH, Delâge A, Densmore A, Janz S, Lamontagne B, Lapointe J, Post E, Waldron P, Xu DX. A high-resolution silicon-on-insulator arrayed waveguide grating microspectrometer with sub-micrometer aperture waveguides. Opt Express 2007; 15:2299-2306. [PMID: 19532464 DOI: 10.1364/oe.15.002299] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We demonstrate a 50-channel high-resolution arrayed waveguide grating microspectrometer with a 0.2 nm channel spacing on a silicon-on-insulator (SOI) platform. The chip size is 8 mm x 8 mm. High channel density and spectral resolution are achieved using high aspect ratio 0.6 mum x 1.5 mum waveguide apertures to inject the light into the input combiner and to intercept different spectral channels at the output combiner focal region. The measured crosstalk is <-10 dB, the 3 dB channel bandwidth is 0.15 nm, and the insertion loss is -17 dB near the central wavelength of lambda = 1.545 mum.
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Gaudreau L, Sachrajda AS, Studenikin S, Zawadzki P, Kam A, Lapointe J. Coherent Transport Through a Quadruple Point in a Few Electron Triple Dot. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2730161] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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43
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Kim D, Lefebvre J, Lapointe J, Reimer ME, Mckee J, Poole PJ, Williams RL. Optical spectroscopy of single, planar, self-assembled InAs/InP quantum dots. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pssc.200671559] [Citation(s) in RCA: 5] [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: 11/11/2022]
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Gaudreau L, Studenikin SA, Sachrajda AS, Zawadzki P, Kam A, Lapointe J, Korkusinski M, Hawrylak P. Stability diagram of a few-electron triple dot. Phys Rev Lett 2006; 97:036807. [PMID: 16907532 DOI: 10.1103/physrevlett.97.036807] [Citation(s) in RCA: 6] [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: 04/21/2006] [Indexed: 05/11/2023]
Abstract
Individual and coupled quantum dots containing one or two electrons have been realized and are regarded as components for future quantum information circuits. In this Letter we map out experimentally the stability diagram of the few-electron triple dot system, the electron configuration map as a function of the external tuning parameters, and reveal experimentally for the first time the existence of quadruple points, a signature of the three dots being in resonance. In the vicinity of these quadruple points we observe a duplication of charge transfer transitions related to charge and spin reconfigurations triggered by changes in the total electron occupation number. The experimental results are largely reproduced by equivalent circuit analysis and Hubbard models. Our results are relevant for future quantum mechanical engineering applications within both quantum information and quantum cellular automata architectures.
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Affiliation(s)
- L Gaudreau
- Institute For Microstructural Sciences, NRC, Ottawa, Canada K1 A 0R6
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45
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Baldassarre H, Wang B, Pierson J, Neveu N, Sneek L, Lapointe J, Cote F, Kafidi N, Keefer CL, Lazaris A, Karatzas CN. Prepubertal propagation of transgenic cloned goats by laparoscopic ovum pick-up and in vitro embryo production. Cloning Stem Cells 2004; 6:25-9. [PMID: 15107243 DOI: 10.1089/15362300460743808] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The use of laparoscopic ovum pick-up (LOPU) followed by in vitro embryo production was evaluated in the early propagation of cloned goats. Ten kinder goats produced by somatic cell nuclear transfer technology were used as oocyte donors. Half of the donor animals were subjected to LOPU at 2-3 months of age (prior to induction of lactation), whereas the other five goats were subjected to LOPU at 6-7 months of age (following induction to lactation). They were stimulated with 80 mg NIH-FSH-P1 (Folltropin, Vetrepharm, Canada) together with 300 IU eCG (Novormon, Vetrepharm, Canada) administered intramuscularly 36 h prior to LOPU. The number of follicles aspirated and oocytes recovered was higher in the younger group of donors (57 +/- 7 and 41 +/- 4 vs. 28 +/- 2 and 25.8 +/- 2, p < 0.05), however, oocytes from animals in the late prepubertal age showed higher developmental capacity resulting in higher transferable embryo yield (81.4% vs. 67.8%, p < 0.01), pregnancy rate (80% vs. 40%, p < 0.05) and total kids born (27 vs. 15, p < 0.01). In conclusion, LOPU in combination with in vitro embryo production techniques is an efficient method for the early propagation of valuable goats produced by somatic cell nuclear transfer.
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Affiliation(s)
- H Baldassarre
- Nexia Biotechnologies Inc., Vaudreuil-Dorion, Quebec, Canada.
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Pioro-Ladrière M, Ciorga M, Lapointe J, Zawadzki P, Korkusiński M, Hawrylak P, Sachrajda AS. Spin-blockade spectroscopy of a two-level artificial molecule. Phys Rev Lett 2003; 91:026803. [PMID: 12906500 DOI: 10.1103/physrevlett.91.026803] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2002] [Indexed: 05/24/2023]
Abstract
Coulomb- and spin-blockade spectroscopy investigations have been performed on an electrostatically defined "artificial molecule" connected to spin polarized leads. The molecule is first effectively reduced to a two-level system by placing both constituent atoms at a specific location of the level spectrum. The spin sensitivity of the conductance enables us to identify the electronic spin states of the two-level molecule. We find in addition that the magnetic field induces variations in the tunnel coupling between the two atoms. The lateral nature of the device is evoked to explain this behavior.
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Affiliation(s)
- M Pioro-Ladrière
- Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
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Abstract
Androgens are known to inhibit the growth of breast cancer cells, but the molecular mechanism of androgen-induced growth inhibition remains unknown. To address this question, we examined functional and quantitative alterations in cell cycle regulators in the E-responsive CAMA-1 breast cancer cell line. We report here that the androgen 5 alpha-dihydrotestosterone inhibits the proliferation of CAMA-1 breast cancer cells. This inhibition of cell proliferation was dose dependent, and maximal inhibition of E2-stimulated proliferation was observed at the concentration of 1 nM 5 alpha-dihydrotestosterone. 5 alpha-Dihydrotestosterone-induced growth arrest was accompanied by an increase in the proportion of cells in the G(1) phase of the cell cycle. Compared with control cells, 5 alpha-dihydrotestosterone-treated cells showed an increase in the relative proportion of hypophosphorylated retinoblastoma protein consistent with G(1) arrest. In CAMA-1 cells, 5 alpha-dihydrotestosterone caused an accumulation of the cyclin-dependent kinase inhibitor p27(Kip1). Cyclin E-cyclin-dependent kinase-2-associated kinase activity was strongly inhibited in 5 alpha-dihydrotestosterone-treated cells, and immunoprecipitation-Western blot analysis showed an increase in the amount of p27(Kip1) associated with cyclin E-cyclin-dependent kinase-2 complexes. These results suggest that inhibition of breast cancer cell growth by androgens may be mediated at least in part by inactivation of the cyclin E-cyclin-dependent kinase-2 complexes by p27(Kip1).
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Affiliation(s)
- J Lapointe
- Oncology and Molecular Endocrinology Research Center, CHUL Research Center and Laval University, Québec, Canada G1V 4G2
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Auger A, Truong TQ, Rhainds D, Lapointe J, Letarte F, Brissette L. Low and high density lipoprotein metabolism in primary cultures of hepatic cells from normal and apolipoprotein E knockout mice. Eur J Biochem 2001; 268:2322-30. [PMID: 11298750 DOI: 10.1046/j.1432-1327.2001.02115.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Apolipoprotein E (apoE) plays a major role in lipoprotein metabolism by mediating the binding of apoE-containing lipoproteins to receptors. The role of hepatic apoE in the catabolism of apoE-free lipoproteins such as low density lipoprotein (LDL) and high density lipoprotein-3 (HDL(3)) is however, unclear. We analyzed the importance of hepatic apoE by comparing human LDL and HDL(3) metabolism in primary cultures of hepatic cells from control C57BL/6J and apoE knockout (KO) mice. Binding analysis showed that the maximal binding capacity (Bmax) of LDL, but not of HDL(3), is increased by twofold in the absence of apoE synthesis/secretion. Compared to control hepatic cells, LDL and HDL(3) holoparticle uptake by apoE KO hepatic cells, as monitored by protein degradation, is reduced by 54 and 77%, respectively. Cleavage of heparan sulfate proteoglycans (HSPG) by treatment with heparinase I reduces LDL association by 21% in control hepatic cells. Thus, HSPG alone or a hepatic apoE-HSPG complex is partially involved in LDL association with mouse hepatic cells. In apoE KO, but not in normal hepatic cells, the same treatment increases LDL uptake/degradation by 2.4-fold suggesting that in normal hepatic cells, hepatic apoE increases LDL degradation by masking apoB-100 binding sites on proteoglycans. Cholesteryl ester (CE) association and CE selective uptake (CE/protein association ratio) from LDL and HDL(3) by mouse hepatic cells were not affected by the absence of apoE expression. We also show that 69 and 72% of LDL-CE hydrolysis in control and apoE KO hepatic cells, respectively, is sensitive to chloroquine revealing the importance of a pathway linked to lysosomes. In contrast, HDL(3)-CE hydrolysis is only mediated by a nonlysosomal pathway in both control and apoE KO hepatic cells. Overall, our results indicate that hepatic apoE increases the holoparticle uptake pathway of LDL and HDL(3) by mouse hepatic cells, that HSPG devoid of apoE favors LDL binding/association but impairs LDL uptake/degradation and that apoE plays no significant role in CE selective uptake from either human LDL or HDL(3) lipoproteins.
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MESH Headings
- Animals
- Apolipoproteins E/genetics
- Binding Sites
- CD36 Antigens/metabolism
- Cells, Cultured
- Cholesterol Esters/metabolism
- Dose-Response Relationship, Drug
- Female
- Heparan Sulfate Proteoglycans/metabolism
- Homozygote
- Humans
- Immunoblotting
- Kinetics
- Lipoproteins, HDL/metabolism
- Lipoproteins, LDL/metabolism
- Liver/cytology
- Liver/metabolism
- Male
- Membrane Proteins
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Protein Binding
- Receptors, Immunologic
- Receptors, LDL/metabolism
- Receptors, Lipoprotein
- Receptors, Scavenger
- Scavenger Receptors, Class B
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Affiliation(s)
- A Auger
- Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada
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Lapointe J. [Supervision of undergraduates at the formative stage or of nursing students at orientation]. Infirm Que 2001; 8:45-7. [PMID: 11887688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
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Bernier S, Dubois DY, Therrien M, Lapointe J, Chênevert R. Synthesis of glutaminyl adenylate analogues that are inhibitors of glutaminyl-tRNA synthetase. Bioorg Med Chem Lett 2000; 10:2441-4. [PMID: 11078196 DOI: 10.1016/s0960-894x(00)00478-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Glutaminol adenylate 5 is a competitive inhibitor of glutaminyl-tRNA synthetase with respect to glutamine (Ki = 280 nM) and to ATP (Ki = 860 nM). The corresponding methyl phosphate ester 4 is a weaker inhibitor (Ki approximately 10 microM) with respect to glutamine.
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Affiliation(s)
- S Bernier
- Département de Chimie, Centre de Recherche sur la Fonction, la Structure et l'Ingénierie des Protéines (CREFSIP), Faculté des Sciences et de Génie, Université Laval, Québec, Canada
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