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Bérubé M, Gélinas C, Feeley N, Martorella G, Côté J, Laflamme GY, Rouleau DM, Choinière M. Feasibility of a Hybrid Web-Based and In-Person Self-management Intervention Aimed at Preventing Acute to Chronic Pain Transition After Major Lower Extremity Trauma (iPACT-E-Trauma): A Pilot Randomized Controlled Trial. Pain Med 2019; 20:2018-2032. [PMID: 30840085 PMCID: PMC6784743 DOI: 10.1093/pm/pnz008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Objective 1) To assess the feasibility of research methods to test a self-management intervention aimed at preventing acute to chronic pain transition in patients with major lower extremity trauma (iPACT-E-Trauma) and 2) to evaluate its potential effects at three and six months postinjury. Design A pilot randomized controlled trial (RCT) with two parallel groups. Setting A supraregional level 1 trauma center. Methods Fifty-six adult patients were randomized. Participants received the intervention or an educational pamphlet. Several parameters were evaluated to determine the feasibility of the research methods. The potential efficacy of iPACT-E-Trauma was evaluated with measures of pain intensity and pain interference with activities. Results More than 80% of eligible patients agreed to participate, and an attrition rate of ≤18% was found. Less than 40% of screened patients were eligible, and obtaining baseline data took 48 hours postadmission on average. Mean scores of mild pain intensity and pain interference with daily activities (<4/10) on average were obtained in both groups at three and six months postinjury. Between 20% and 30% of participants reported moderate to high mean scores (≥4/10) on these outcomes at the two follow-up time measures. The experimental group perceived greater considerable improvement in pain (60% in the experimental group vs 46% in the control group) at three months postinjury. Low mean scores of pain catastrophizing (Pain Catastrophizing Scale score < 30) and anxiety and depression (Hospital Anxiety and Depression Scale scores ≤ 10) were obtained through the end of the study. Conclusions Some challenges that need to be addressed in a future RCT include the small proportion of screened patients who were eligible and the selection of appropriate tools to measure the development of chronic pain. Studies will need to be conducted with patients presenting more serious injuries and psychological vulnerability or using a stepped screening approach.
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Affiliation(s)
- M Bérubé
- Faculty of Nursing, Laval University, Quebec City, Quebec, Canada
- Research Center of the CHU de Québec, Quebec City, Quebec, Canada
| | - C Gélinas
- Faculty of Nursing, Laval University, Quebec City, Quebec, Canada
- Ingram School of Nursing, McGill University, Montréal, Québec, Canada
| | - N Feeley
- Ingram School of Nursing, McGill University, Montréal, Québec, Canada
- Centre for Nursing Research and Lady Davis Institute, Jewish General Hospital, Montréal, Quebec, Canada
| | - G Martorella
- College of Nursing, Florida State University, Tallahassee, Florida, USA
| | - J Côté
- Centre de Recherche, Centre Hospitalier de l’Université Montréal (CRCHUM), Montréal, Québec, Canada
| | - G Y Laflamme
- Hôpital du Sacré-Cœur de Montréal, Centre Intégré Universitaire du Nord de l’Île-de-Montréal, Montréal, Québec, Canada
| | - D M Rouleau
- Hôpital du Sacré-Cœur de Montréal, Centre Intégré Universitaire du Nord de l’Île-de-Montréal, Montréal, Québec, Canada
| | - M Choinière
- Centre de Recherche, Centre Hospitalier de l’Université Montréal (CRCHUM), Montréal, Québec, Canada
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Rossing NN, Stentoft D, Flattum A, Côté J, Karbing DS. Influence of population size, density, and proximity to talent clubs on the likelihood of becoming elite youth athlete. Scand J Med Sci Sports 2017; 28:1304-1313. [PMID: 29117452 DOI: 10.1111/sms.13009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2017] [Indexed: 11/28/2022]
Abstract
Previous studies have found significant differences in the likelihood of becoming an elite athlete depending on community population sizes and densities, an effect known as the place of early development, or birthplace effect. However, the results have not been consistent between sports or European countries. As both professional and voluntary clubs are vital to the talent development systems in Europe, the proximity of an athlete's place of early development to the location of talent clubs may be an important predictor of the likelihood of becoming an elite athlete. Therefore, the primary purpose of this study was to investigate the place of early development effect and the effect of proximity to talent clubs. The samples included elite youth league athletes (579 football and 311 handball) and national youth athletes (85 football and 80 handball) and a comparison group of 147 221 football and 26 290 handball youth athletes. Odds ratios showed variations in the optimal community size and density across sports. Geospatial analyses of proximity to talent clubs highlighted a trend indicating that most national and elite youth league athletes in both sports had their place of early development in their sport near a talent club. The results suggest that proximity is an important predictor in the development of expertise across sports, but future studies need to clarify if proximity is important in other countries and sports.
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Affiliation(s)
- N N Rossing
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - D Stentoft
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - A Flattum
- Department of Public Health, Aarhus University, Aarhus, Denmark
| | - J Côté
- School of Kinesiology and Health studies, Queens University, Kingston, Canada
| | - D S Karbing
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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Cameron-Gagné M, Jacques F, Houde C, Côté J, Chetaille P, Drolet C, Vaujois L, Bédard E, Perron J. LONG-TERM OUTCOMES AFTER PAEDIATRIC AND ADULT DISCRETE SUBAORTIC STENOSIS REPAIR. Can J Cardiol 2017. [DOI: 10.1016/j.cjca.2017.07.097] [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: 11/15/2022] Open
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Abstract
Nucleosomes, the basic units of chromatin, are decorated with a myriad of posttranslational modifications (PTMs) by the action of chromatin modifiers. These enzymes function almost exclusively as part of stable protein complexes that assist their recruitment to specific genomic loci, specify their substrate, and provide allosteric control. By altering the interactions within nucleosomes or with neighboring nucleosomes and serving as a platform to engage effector proteins, PTMs deposited by histone-modifying complexes influence virtually every nuclear process and are at the heart of the epigenetic mechanisms. Hence, it is critical to identify their components, define their structures, and characterize their biochemical activities. Here we describe protocols for tandem affinity purification (TAP) of native histone acetyltransferase (HAT) and methyltransferase (HMT) complexes from human cells engineered to express bait proteins from a genomic safe harbor or their endogenous chromosomal genes, using zinc-finger nucleases (ZFNs), TAL effector nucleases (TALENs), and clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 systems. The approaches presented aim to preserve natural transcriptional and posttranscriptional regulation and minimize biochemical artifacts due to ectopic expression. Near homogenous preparations of native complexes are obtained in sufficient amounts to perform biochemical assays and characterize their components.
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Affiliation(s)
- Y Doyon
- Centre Hospitalier Universitaire de Québec Research Center and Faculty of Medicine, Laval University, Quebec City, QC, Canada.
| | - J Côté
- Centre Hospitalier Universitaire de Québec Research Center and Faculty of Medicine, Laval University, Quebec City, QC, Canada; St-Patrick Research Group in Basic Oncology and Laval University Cancer Research Center, Quebec City, QC, Canada.
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Houle J, Beaulieu MD, Chiasson JL, Lespérance F, Côté J, Strychar I, Bherer L, Meunier S, Lambert J. Glycaemic control and self-management behaviours in Type 2 diabetes: results from a 1-year longitudinal cohort study. Diabet Med 2015; 32:1247-54. [PMID: 25581545 DOI: 10.1111/dme.12686] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 10/21/2014] [Accepted: 01/06/2015] [Indexed: 12/17/2022]
Abstract
AIM To better understand the associations between changes in self-management behaviours and glycaemic control. METHODS We conducted a prospective observational study of 295 adult patients with Type 2 diabetes evaluated at baseline, 6 and 12 months. Four self-management behaviours were evaluated using the Summary of Diabetes Self-Care Activities instrument, which assesses healthy diet, physical activity, medication taking and self-monitoring of blood glucose. Using hierarchical linear regression models, we tested whether changes in self-management behaviours were associated with short-term (6-month) or long-term (12-month) changes in glycaemic control, after controlling for demographic and clinical characteristics. RESULTS Improved diet was associated with a decrease in HbA1c level, both at 6 and 12 months. Improved medication taking was associated with short-term improvement in glycaemic control, while increased self-monitoring of blood glucose frequency was associated with a 12-month improvement in HbA1c . Completely stopping exercise after being physically active at baseline was associated with a rise in HbA1c level at 6-month follow-up. Interaction analysis indicated that a healthy diet benefitted all participant subgroups, but that medication taking was associated with glycaemic control only for participants living in poverty and more strongly for those with lower educational levels. Finally, a higher self-monitoring of blood glucose frequency was associated with better glycaemic control only in insulin-treated participants. CONCLUSIONS Even after adjusting for potential confounders (including baseline HbA1c ), increased frequency of healthy diet, medication taking and self-monitoring of blood glucose were associated with improved HbA1c levels. These self-management behaviours should be regularly monitored to identify patients at risk of deterioration in glycaemic control. Barriers to optimum self-management should be removed, particularly among socio-economically disadvantaged populations.
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Affiliation(s)
- J Houle
- Department of Psychology, Université du Québec à Montréal, Montréal, Quebec, Canada
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
| | - M-D Beaulieu
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
- Department of Family and Emergency Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - J-L Chiasson
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
- Department of Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - F Lespérance
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
- Department of Psychiatry, Université de Montréal, Montréal, Quebec, Canada
| | - J Côté
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
- Faculty of Nursing, Université de Montréal, Montréal, Quebec, Canada
| | - I Strychar
- Centre de recherche du Centre hospitalier universitaire de l'Université de Montréal, Montréal, Quebec, Canada
- Department of Nutrition, Université de Montréal, Montréal, Quebec, Canada
| | - L Bherer
- PERFORM Centre, Concordia University, Montréal, Quebec, Canada
- Institut de Gériatrie de Montréal, Montréal, Quebec, Canada
| | - S Meunier
- Department of Psychology, Université du Québec à Montréal, Montréal, Quebec, Canada
| | - J Lambert
- Department of Social and Preventive Medicine, School of Public Health, Université de Montréal, Montréal, Quebec, Canada
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Affiliation(s)
- J. Côté
- Corresponding author. Lallemand Bio-Ingredients, 1620 Prefontaine, Montreal, QC H1W 2N8, Canada
- Lallemand Bio-Ingredients, Montreal, QC, Canada
| | - J. Dion
- L.V. Lomas Limited, Montreal, QC, Canada
| | - P. Burguière
- Lallemand Health Solutions, Montreal, QC, Canada
| | - L. Casavant
- Lallemand Baking Solutions, Montreal, QC, Canada
| | - J. Van Eijk
- Lallemand Baking Solutions, Montreal, QC, Canada
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Rochon K, Proteau-Gagné A, Bourassa P, Nadon JF, Côté J, Bournival V, Gobeil F, Guérin B, Dory YL, Gendron L. Preparation and evaluation at the delta opioid receptor of a series of linear leu-enkephalin analogues obtained by systematic replacement of the amides. ACS Chem Neurosci 2013; 4:1204-16. [PMID: 23650868 PMCID: PMC3750687 DOI: 10.1021/cn4000583] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [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: 02/28/2013] [Accepted: 05/07/2013] [Indexed: 12/16/2022] Open
Abstract
Leu-enkephalin analogues, in which the amide bonds were sequentially and systematically replaced either by ester or N-methyl amide bonds, were prepared using classical organic chemistry as well as solid phase peptide synthesis (SPPS). The peptidomimetics were characterized using competition binding, ERK1/2 phosphorylation, receptor internalization, and contractility assays to evaluate their pharmacological profile over the delta opioid receptor (DOPr). The lipophilicity (LogD7.4) and plasma stability of the active analogues were also measured. Our results revealed that the last amide bond can be successfully replaced by either an ester or an N-methyl amide bond without significantly decreasing the biological activity of the corresponding analogues when compared to Leu-enkephalin. The peptidomimetics with an N-methyl amide function between residues Phe and Leu were found to be more lipophilic and more stable than Leu-enkephalin. Findings from the present study further revealed that the hydrogen-bond donor properties of the fourth amide of Leu-enkephalin are not important for its biological activity on DOPr. Our results show that the systematic replacement of amide bonds by isosteric functions represents an efficient way to design and synthesize novel peptide analogues with enhanced stability. Our findings further suggest that such a strategy can also be useful to study the biological roles of amide bonds.
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Affiliation(s)
- Kristina Rochon
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Arnaud Proteau-Gagné
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Philippe Bourassa
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Jean-François Nadon
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Jérome Côté
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Véronique Bournival
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Fernand Gobeil
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Brigitte Guérin
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Yves L. Dory
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Louis Gendron
- Département de Physiologie
et Biophysique, Laboratoire de Synthèse Supramoléculaire, Département
de Chimie, Département de pharmacologie, and Département de Médecine
Nucléaire et Radiobiologie, Institut de Pharmacologie, Université de Sherbrooke, 3001, 12 Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
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Turnnidge J, Hancock DJ, Côté J. The influence of birth date and place of development on youth sport participation. Scand J Med Sci Sports 2012; 24:461-8. [PMID: 22998526 DOI: 10.1111/sms.12002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/13/2012] [Indexed: 11/28/2022]
Abstract
Previous research highlights the critical role that contextual factors play in shaping athlete development. The purpose of the present study was to investigate two of these contextual factors: birth date (known as the relative age effect, RAE) and city of development as determinants of participation in a sample of youth ice hockey players. The sample included 146,424 athletes registered with Ontario youth ice hockey between the 2004 and 2010 seasons. Chi-square statistics determined a significant RAE in youth ice hockey. Findings also revealed a significant association between small cities of development and increased youth ice hockey participation. Finally, there was no evidence of an interaction between relative age and city of development. The characteristics of smaller communities that may facilitate sport participation across all youth are discussed, along with recommendations for future research.
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Affiliation(s)
- J Turnnidge
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada
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Larochelliere ED, Côté J, Ross M, Dion-Roy V, Pibarot P, Després J, Larose E. 753 Impact of Fat Distribution on the Cardiometabolic Risk Profile of Non-Obese Healthy Young Men and Women. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.680] [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: 11/16/2022] Open
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Côté J, Caillet S, Doyon G, Dussault D, Salmieri S, Lorenzo G, Sylvain JF, Lacroix M. Effects of juice processing on cranberry antioxidant properties. Food Res Int 2011. [DOI: 10.1016/j.foodres.2011.06.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Larose E, De Larochellière E, Côté J, Ross M, Dion-Roy V, Pibarot P, Després J. 654 Cardiometabolic risk factors of early atherosclerosis development in apparently healthy young men and women. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.543] [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: 11/30/2022] Open
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De Larochellière E, Côté J, Ross M, Dion-Roy V, Pibarot P, Després J, Larose E. 021 Contributions of cardiac and abdominal visceral adipose tissues to the variation in the cardiometabolic profile of young and healthy adults. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Côté J, Bouchard M, Ratelle M, Ortiz RH, Carrier G, Lapointe C, Bonvalot Y. Reconstruction of daily absorbed doses of permethrin/cypermethrin in the Canadian population using toxicokinetic modeling. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
There is a growing public interest for the North American cranberry (Vaccinium macrocarpon) as a functional food because of the potential health benefits linked to phytochemical compounds present in the fruit--the anthocyanin pigments, responsible for its brilliant red color, and other secondary plant metabolites (flavonols, flavan-3-ols, proanthocyanidins, and phenolic acid derivatives). Isolation of these phenolic compounds and flavonoids from a sample matrix is a prerequisite to any comprehensive analysis scheme. By far the most widely employed analytical technique for the characterization of these compounds has been high-performance liquid chromatography(HPLC) coupled with ultraviolet-visible(UV/Vis) and mass spectrometer(MS) detection. This review covers the cranberry major bioactive compounds, the extraction and purification methods, and the analytical conditions for HPLC used to characterize them. Extraction, chromatographic separation and detection strategies, analyte determinations, and applications in HPLC are discussed and the information regarding methods of specific cranberry analyte analyses has been summarized in tabular form to provide a means of rapid access to information pertinent to the reader.
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Affiliation(s)
- J Côté
- INRS-Institut Armand-Frappier, Research Laboratory in Sciences Applied to Food, 531 des Prairies, Laval, Quebec, Canada H7V 1B7
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Abstract
Cranberries are healthy fruit that contribute color, flavor, nutritional value, and functionality. They are one of only three fruits native to America. Over the past decade, public interest for the North American cranberry (Vaccinium macrocarpon) has been rising with reports of their potential health benefits linked to the numerous phytochemicals present in the fruit--the anthocyanins, the flavonols, the flavan-3-ols, the proanthocyanidins, and the phenolic acid derivatives. The presence of these phytochemicals appears to be responsible for the cranberry property of preventing many diseases and infections, including cardiovascular diseases, various cancers, and infections involving the urinary tract, dental health, and Helicobacter pylori-induced stomach ulcers and cancers. Recent years have seen important breakthroughs in our understanding of the mechanisms through which these compounds exert their beneficial biological effects, yet these remain to be scientifically substantiated. In this paper these characteristics, as well as the antioxidant, radical scavenging, antibacterial, antimutagen, and anticarcinogen properties of cranberry major bioactive compounds are explained.
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Affiliation(s)
- J Côté
- Research Laboratory in Applied Food Science, INRS-Institut Armand-Frappier, Laval, Quebec, Canada
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Abstract
The aim of this longitudinal study was to identify the determinants of adherence to antiretroviral therapy (ART) in HIV patients over a period of 12 months. A total of 376 individuals living with HIV treated with ART participated in the study. Data were collected at baseline and at three, six, nine and 12 months. Variables assessed were adherence, attitude, outcome expectancies, self-efficacy, patient satisfaction with the relationship with their physician, provision of social support, optimism, CD4 cell count, viral load and side effects. Predictors of adherence in the Generalized Estimated Equation (GEE) were: high perception of self-efficacy (OR=1.68; 95%CI 1.27-2.22), positive attitude towards taking medication (OR=1.56; 95%CI 1.18-2.06), not living alone (OR=1.47; 95%CI 1.04-2.08) and being a male (OR=2.81; 95%CI 1.47-5.34). Subsequent analysis showed that a positive attitude towards taking medication was associated with a high level of patient satisfaction with their physician, high perceived social support, being optimistic, living with HIV for five years or less and experiencing no side effects. Also, a strong sense of self-efficacy was associated with positive perception of social support, high level of patient satisfaction with their physician and not living alone. These results suggest that interventions aimed at improving adherence to ART should focus on reinforcing self-efficacy and developing a positive attitude towards taking medication.
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Affiliation(s)
- G Godin
- Research Group on Behaviors in the Field of Health, Université Laval, Ste-Foy, Québec, Canada.
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Côté J, Bouchard M, Carrier G, Ortiz RH, Fuhr U, Woollen B, Lapointe C, Bonvalot Y. Toxicokinetic modeling of cypermethrin and permethrin for dose reconstruction in the population. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Côté J, Blier PU, Caron A, Dufresne F. Do territorial male three-spined sticklebacks have sperm with different characteristics than nonterritorial males? CAN J ZOOL 2009. [DOI: 10.1139/z09-094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The three-spined stickleback ( Gasterosteus aculeatus aculeatus L., 1758) shows unequal energetic expenditure upon reproduction as some males defend territories and build nest (territorials: TM) where they spawn singly with females, whereas other males remain nonterritorial (NTM), do not build nests, and resort to sneaking fertilizations from nesting males. We examined the effects of reproductive strategy on various sperm parameters. Territorial status was assessed by introducing males in small wading pools and recording the number of males with a nest. Males from all pools were remixed and nesting status was reassessed. This allowed us to discriminate a group of males with repetitive territorial or nonterritorial behaviours (TM and NTM) or a “facultative” territorial behaviour (FM). TM had a significantly larger gonadosomatic index (GSI) than both FM and NTM. FM had a GSI that was significantly larger than NTM, but significantly smaller than TM. Sperm motility did not differ among males with different reproductive tactics. There were no significant differences in citrate synthase (CS) and pyruvate kinase (PK) activities among males with different status. Curiously, we found a significant negative relationship between CS and PK activities and total number of sperm.
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Affiliation(s)
- J. Côté
- Département de Biologie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1, Canada
| | - P. U. Blier
- Département de Biologie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1, Canada
| | - A. Caron
- Département de Biologie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1, Canada
| | - F. Dufresne
- Département de Biologie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1, Canada
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22
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Bélanger S, Bovenzi V, Côté J, Neugebauer W, Amblard M, Martinez J, Lammek B, Savard M, Gobeil F. Structure-activity relationships of novel peptide agonists of the human bradykinin B2 receptor. Peptides 2009; 30:777-87. [PMID: 19111586 DOI: 10.1016/j.peptides.2008.12.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Revised: 11/28/2008] [Accepted: 12/01/2008] [Indexed: 11/22/2022]
Abstract
The nonapeptide bradykinin (BK) is involved in the genesis of inflammation, edema and in pain mediation. As such, much effort has gone into the development of peptide/non-peptide antagonists to counteract these processes. However, there is an increasing awareness of the potential value of chemically stable BK agonists in the treatment of diabetes and cardiovascular diseases. In this study, a structure-activity relationship study of BK was performed to develop potent and stable peptide mimetics active at the human B2 receptors (hB2R). Twenty-three analogues were produced with substitutions at positions 1, 3, 5, 7, 8 and/or 9 of BK. In vitro binding (on transiently transfected HEK-293T cells) and biological activities (vasomotricity tests on human umbilical veins, MAPK assays on HEK-293T cells) of novel BK peptide derivatives at hB2R were determined alongside with previously reported synthetic agonists (e.g. RMP-7, JMV1609, FR190997). Some peptides were also tested in vivo in rats and rabbits using blood pressure assays. Two compounds, [Hyp(3), Thi(5), Cha(8)]-BK and [Hyp(3), Thi(5), (N)Chg(7), Thi(8)]-BK, exhibited equivalent (or even greater) in vitro affinities and potencies to BK at the naturally expressed and recombinant hB2R. Their potency and duration of action in vivo were highly superior to BK, thus inferring that they can withstand intravascular proteolysis. These novel compounds show promise as candidates for investigating the pharmacology of BK receptors and developing potential therapeutical applications.
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Affiliation(s)
- Simon Bélanger
- Department of Pharmacology, Université de Sherbrooke, Québec, Canada
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23
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Zhao TT, Graber TE, Jordan LE, Cloutier M, Lewis SM, Goulet I, Côté J, Holcik M. hnRNP A1 regulates UV-induced NF-κB signalling through destabilization of cIAP1 mRNA. Cell Death Differ 2008; 16:244-52. [DOI: 10.1038/cdd.2008.146] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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24
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Kron S, Nnakwe C, Efimova E, Chakraborty C, Weichselbaum R, Côté J. Chromatin signaling in DNA damage checkpoint response. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)71415-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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25
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Jha M, Côté J, Hoeh WR, Blier PU, Stewart DT. Sperm motility in Mytilus edulis in relation to mitochondrial DNA polymorphisms: implications for the evolution of doubly uniparental inheritance in bivalves. Evolution 2007; 62:99-106. [PMID: 18039328 DOI: 10.1111/j.1558-5646.2007.00262.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bivalves of the families Mytilidae, Unionidae, and Veneridae have an unusual mode of mitochondrial DNA (mtDNA) transmission called doubly uniparental inheritance (DUI). A characteristic feature of DUI is the presence of two gender-associated mtDNA genomes that are transmitted through males (M-type mtDNA) and females (F-type mtDNA), respectively. Female mussels are predominantly homoplasmic with only the F-type expressed in both somatic and gonadal tissue; males are heteroplasmic with the M-type expressed in the gonad and F-type in somatic tissue for the most part. An unusual evolutionary feature of this system is that an mt genome with F-coding sequences occasionally invades the male route of inheritance (i.e., a "role reversal" event), and is thereafter transmitted as a new M-type. Phylogenetic studies have demonstrated that the new or "recently masculinized" M-types may eventually replace the older or "standard" M-types over time. To investigate whether this replacement process could be due to an advantage in sperm swimming behavior, we measured differences in motility parameters and found that sperm with the recently masculinized M-type had significantly faster curvilinear velocity and average path velocity when compared to sperm with standard M-type. This increase in sperm swimming speed could explain the multiple evolutionary replacements of standard M-types by masculinized M-types that have been hypothesized for the mytilid lineage. However, our observations do not support the hypothesis that DUI originated because it permits the evolution of mitochondrial adaptations specific to sperm performance, otherwise, the evolutionarily older, standard M genome should perform better.
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Affiliation(s)
- M Jha
- Department of Biology, Acadia University, Wolfville, NS, Canada.
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26
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Abstract
The histone acetyltransferases (HATs) of the MYST family are highly conserved in eukaryotes and carry out a significant proportion of all nuclear acetylation. These enzymes function exclusively in multisubunit protein complexes whose composition is also evolutionarily conserved. MYST HATs are involved in a number of key nuclear processes and play critical roles in gene-specific transcription regulation, DNA damage response and repair, as well as DNA replication. This suggests that anomalous activity of these HATs or their associated complexes can easily lead to severe cellular malfunction, resulting in cell death or uncontrolled growth and malignancy. Indeed, the MYST family HATs have been implicated in several forms of human cancer. This review summarizes the current understanding of these enzymes and their normal function, as well as their established and putative links to oncogenesis.
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Affiliation(s)
- N Avvakumov
- Laval University Cancer Research Center, Hôtel-Dieu de Québec (CHUQ), 9 McMahon Street, Quebec City, Quebec, Canada
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27
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Abstract
Multiple chromatin modifying proteins and multisubunit complexes have been characterized in recent years. Histone acetyltransferase (HAT) activities have been the most thoroughly studied, both biochemically and functionally. This review sums up the current knowledge on a specific group of proteins that is extremely well conserved throughout evolution, the MYST family of histone acetyltransferases. These proteins play critical roles in various nuclear functions and the control of cell proliferation.
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Affiliation(s)
- R T Utley
- Laval University Cancer Research Center, Hôtel-Dieu de Québec (CHUQ), 11 Côte du Palais, Quebec City, QC G1R 2J6, Canada
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28
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Nourani A, Doyon Y, Utley RT, Allard S, Lane WS, Côté J. Role of an ING1 growth regulator in transcriptional activation and targeted histone acetylation by the NuA4 complex. Mol Cell Biol 2001; 21:7629-40. [PMID: 11604499 PMCID: PMC99934 DOI: 10.1128/mcb.21.22.7629-7640.2001] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.5] [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: 11/20/2022] Open
Abstract
The yeast NuA4 complex is a histone H4 and H2A acetyltransferase involved in transcription regulation and essential for cell cycle progression. We identify here a novel subunit of the complex, Yng2p, a plant homeodomain (PHD)-finger protein homologous to human p33/ING1, which has tumor suppressor activity and is essential for p53 function. Mass spectrometry, immunoblotting, and immunoprecipitation experiments confirm the stable stoichiometric association of this protein with purified NuA4. Yeast cells harboring a deletion of the YNG2 gene show severe growth phenotype and have gene-specific transcription defects. NuA4 complex purified from the mutant strain is low in abundance and shows weak histone acetyltransferase activity. We demonstrate conservation of function by the requirement of Yng2p for p53 to function as a transcriptional activator in yeast. Accordingly, p53 interacts with NuA4 in vitro and in vivo, an interaction reminiscent of the p53-ING1 physical link in human cells. The growth defect of Delta yng2 cells can be rescued by the N-terminal part of the protein, lacking the PHD-finger. While Yng2 PHD-finger is not required for p53 interaction, it is necessary for full expression of the p53-responsive gene and other NuA4 target genes. Transcriptional activation by p53 in vivo is associated with targeted NuA4-dependent histone H4 hyperacetylation, while histone H3 acetylation levels remain unchanged. These results emphasize the essential role of the NuA4 complex in the control of cell proliferation through gene-specific transcription regulation. They also suggest that regulation of mammalian cell proliferation by p53-dependent transcriptional activation functions through recruitment of an ING1-containing histone acetyltransferase complex.
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Affiliation(s)
- A Nourani
- Laval University Cancer Research Center, Hôtel-Dieu de Québec, Quebec City, Quebec G1R 2J6, Canada
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29
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Abstract
A case of recurring primary hepatic actinomycosis is reported. A 50-year-old man presented with fever, weight loss and multiple hepatic masses. A diagnosis was obtained by cytological examination of a biopsy sample taken from the largest hepatic mass, which revealed the presence of Actinomyces species. The patient was treated with penicillin for 12 months and did well. Seven years later, he presented with similar symptoms but with a single large liver mass and a pulmonary infiltrate in the right lower lobe. Liver biopsy showed an inflammatory pseudotumour, and lung biopsy showed the presence of Actinomyces species. Again, the patient was treated with penicillin. Five months later, the patient was doing well, and a follow-up computed tomography scan showed partial regression of the hepatic pseudotumour. This case indicates that hepatic actinomycosis can recur several years after an appropriate treatment and stresses the need for careful follow-up in such patients.
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Affiliation(s)
- R Tambay
- Hôpital Saint-Luc, Centre Hospitalier de l'Université de Montréal, 264 east René-Lévesque blvd., Montréal, Québec H2X 1P1, Canada
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30
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Chen T, Côté J, Carvajal HV, Richard S. Identification of Sam68 arginine glycine-rich sequences capable of conferring nonspecific RNA binding to the GSG domain. J Biol Chem 2001; 276:30803-11. [PMID: 11395494 DOI: 10.1074/jbc.m102247200] [Citation(s) in RCA: 19] [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: 11/06/2022] Open
Abstract
Sam68 is an RNA-binding protein that contains a heterogeneous nuclear ribonucleoprotein K homology domain embedded in a larger RNA binding domain called the GSG (GRP33, Sam68, GLD-1) domain. This family of proteins is often referred to as the STAR (signal transduction and activators of RNA metabolism) proteins. It is not known whether Sam68 is a general nonspecific RNA-binding protein or whether it recognizes specific response elements in mRNAs with high affinity. Sam68 has been shown to bind homopolymeric RNA and a synthetic RNA sequence called G8-5 that has a core UAAA motif. Here we performed a structure function analysis of Sam68 and identified two arginine glycine (RG)-rich regions that confer nonspecific RNA binding to the Sam68 GSG domain. In addition, by using chimeric proteins between Sam68 and QKI-7, we demonstrated that one of the Sam68 RG-rich sequences of 26 amino acids was sufficient to confer homopolymeric RNA binding to the GSG domain of QKI-7, another STAR protein. Furthermore, that minimal sequence can also give QKI-7 the ability (as Sam68) to functionally substitute for HIV-1 REV to facilitate the nuclear export of RNAs. Our studies suggest that neighboring RG-rich sequences may impose nonspecific RNA binding to GSG domains. Because the Sam68 RNA binding activity is negatively regulated by tyrosine phosphorylation, our data lead us to propose that Sam68 might be a specific RNA-binding protein when tyrosine phosphorylated.
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Affiliation(s)
- T Chen
- Terry Fox Molecular Oncology Group and the Bloomfield Center for Research on Aging, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital, Canada
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31
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Boulet LP, Bai TR, Becker A, Bérubé D, Beveridge R, Bowie DM, Chapman KR, Côté J, Cockcroft D, Ducharme FM, Ernst P, FitzGerald JM, Kovesi T, Hodder RV, O'Byrne P, Rowe B, Sears MR, Simons FE, Spier S. What is new since the last (1999) Canadian Asthma Consensus Guidelines? Can Respir J 2001; 8 Suppl A:5A-27A. [PMID: 11360044 DOI: 10.1155/2001/278435] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The objective of the present document is to review the impact of new information on the recommendations made in the last (1999) Canadian Asthma Consensus Guidelines. It includes relevant published studies and observations or comments regarding what are considered to be the main issues in asthma management in children and adults in office, emergency department, hospital and clinical settings. Asthma is still insufficiently controlled in a large number of patients, and practice guidelines need to be integrated better with current care. This report re-emphasises the need for the following: objective measures of airflow obstruction to confirm the diagnosis of asthma suggested by the clinical evaluation; identification of contributing factors; and the establishment of a treatment plan to rapidly obtain and maintain optimal asthma control according to specific criteria. Recent publications support the essential role of asthma education and environmental control in asthma management. They further support the role of inhaled corticosteroids as the mainstay of anti-inflammatory therapy of asthma, and of both long acting beta2-agonists and leukotriene antagonists as effective means to improve asthma control when inhaled corticosteroids are insufficient. New developments, such as combination therapy, and recent major trials, such as the Children's Asthma Management Project (CAMP) study, are discussed.
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32
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Côté J, Bowie DM, Robichaud P, Parent JG, Battisti L, Boulet LP. Evaluation of two different educational interventions for adult patients consulting with an acute asthma exacerbation. Am J Respir Crit Care Med 2001; 163:1415-9. [PMID: 11371411 DOI: 10.1164/ajrccm.163.6.2006069] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Asthma education decreases the number of emergency visits in specific subgroups of patients with asthma. However, it remains unknown whether this improvement is related only to the use of an action plan alone or to other components of the educational intervention. A total of 126 patients consulting urgently for an acute asthma exacerbation were recruited; 98 completed the study. The first 45 patients were assigned to Group C (control; usual treatment). Thereafter, patients were randomized to either Group LE (limited education; teaching of the inhaler technique plus self- action plan given by the on call physician) or Group SE (same as group LE plus a structured educational program emphasizing self-capacity to manage asthma exacerbations). At baseline, there was no difference between groups in asthma morbidity, medication needs, or pulmonary function. After 12 mo, only Group SE showed a significant improvement in knowledge, willingness to adjust medications, quality of life scores, and peak expiratory flows. In the last 6 mo, the number of unscheduled medical visits for asthma was significantly lower in Group SE in comparison with groups C and LE (p = 0.03). The number (%) of patients with unscheduled medical visits also decreased significantly in Group SE compared with Groups C and LE (p = 0.02). We conclude that a structured educational intervention emphasizing self-management improves patient outcomes significantly more than a limited intervention or conventional treatment.
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Affiliation(s)
- J Côté
- Unité de Recherche, Centre de Recherche de l'Hôpital Laval, 2725, chemin Sainte-Foy, Institut Universitaire de Cardiologie et de Pneumologie de l'Université Laval, Sainte-Foy, Québec, G1V 4G5, Canada.
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33
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Koch KA, Allard S, Santoro N, Côté J, Thiele DJ. The Candida glabrata Amt1 copper-sensing transcription factor requires Swi/Snf and Gcn5 at a critical step in copper detoxification. Mol Microbiol 2001; 40:1165-74. [PMID: 11401720 DOI: 10.1046/j.1365-2958.2001.02458.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The yeast Candida glabrata rapidly autoactivates transcription of the AMT1 gene in response to potentially toxic copper levels through the copper-inducible binding of the Amt1 transcription factor to a metal response element (MRE) within a positioned nucleosome. Our previous studies have characterized the role of a 16 bp homopolymeric dA:dT DNA structural element in facilitating rapid Amt1 access to the AMT1 promoter nucleosomal MRE. In this study, we have used the genetically more facile yeast Saccharomyces cerevisiae to identify additional cellular factors that are important for promoting rapid autoactivation of the AMT1 gene in response to toxic copper levels. We demonstrate that the Swi/Snf nucleosome remodelling complex and the histone acetyltransferase Gcn5 are both essential for AMT1 gene autoregulation, and that the requirement for these chromatin remodelling factors is target gene specific. Chromatin accessibility measurements performed in vitro and in vivo indicate that part of the absolute requirement for these factors is derived from their involvement in facilitating nucleosomal access to the AMT1 promoter MRE. Additionally, these data implicate the involvement of Swi/Snf and Gcn5 at multiple levels of AMT1 gene autoregulation.
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Affiliation(s)
- K A Koch
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109-0606, USA
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34
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Abstract
We have been using the caspase-2 pre-mRNA as a model system to study the importance of alternative splicing in the regulation of programmed cell death. Inclusion or skipping of a cassette-type exon in the 3' portion of this pre-mRNA leads to the production of isoforms with antagonistic activity in apoptosis. We previously identified a negative regulatory element (In100) located in the intron downstream of alternative exon 9. The upstream portion of this element harbors a decoy 3' acceptor site that engages in nonproductive commitment complex interactions with the 5' splice site of exon 9. This in turn confers a competitive advantage to the exon-skipping splicing pattern. Further characterization of the In100 element reveals a second, functionally distinct, domain located downstream from the decoy 3' acceptor site. This downstream domain harbors several polypyrimidine track-binding protein (PTB)-binding sites. We show that PTB binding to these sites correlates with the negative effect on exon 9 inclusion. Finally, we show that both domains of the In100 element can function independently to repress exon 9 inclusion, although PTB binding in the vicinity of the decoy 3' splice site can modulate its activity. Our results thus reveal a complex composite element that regulates caspase-2 exon 9 alternative splicing through a novel mechanism.
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Affiliation(s)
- J Côté
- Department of Pediatrics and Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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35
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Pelletier G, Stefanovsky VY, Faubladier M, Hirschler-Laszkiewicz I, Savard J, Rothblum LI, Côté J, Moss T. Competitive recruitment of CBP and Rb-HDAC regulates UBF acetylation and ribosomal transcription. Mol Cell 2000; 6:1059-66. [PMID: 11106745 DOI: 10.1016/s1097-2765(00)00104-0] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
RNA polymerase I (PolI) transcription is activated by the HMG box architectural factor UBF, which loops approximately 140 bp of DNA into the enhancesome, necessitating major chromatin remodeling. Here we show that the acetyltransferase CBP is recruited to and acetylates UBF both in vitro and in vivo. CBP activates PolI transcription in vivo through its acetyltransferase domain and acetylation of UBF facilitates transcription derepression and activation in vitro. CBP activation and Rb suppression of ribosomal transcription by recruitment to UBF are mutually exclusive, regulating in vivo PolI transcription through an acetylation-deacetylation "flip-flop." Thus, PolI transcription is regulated by protein acetylation, and the competitive recruitment of CBP and Rb.
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Affiliation(s)
- G Pelletier
- Cancer Research Centre and Department of Medical Biology Laval University Hotel-Dieu de Quebec 11 cote du Palais G1R 2J6, Quebec, Canada
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36
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Angelov D, Charra M, Seve M, Côté J, Khochbin S, Dimitrov S. Differential remodeling of the HIV-1 nucleosome upon transcription activators and SWI/SNF complex binding. J Mol Biol 2000; 302:315-26. [PMID: 10970736 DOI: 10.1006/jmbi.2000.4069] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Here we have examined HIV-1 nucleosome remodeling upon the binding of transcription factors and the SWI/SNF complex using a novel approach. The approach combines UV laser protein-DNA crosslinking, electrophoretic mobility-shift analysis and DNase I protection analysis with immunochemical techniques. It was found that single activator-bound HIV-1 nucleosomes exhibit very weak perturbation in histone NH(2) tail-DNA interactions. However, the simultaneous binding of the transcription activators Sp1, NF-kB1, LEF-1 and USF synergistically increased the release of histone NH(2) tails from nucleosomal DNA. In contrast, the binding of SWI/SNF complex to HIV-1 nucleosome disrupted structured histone domain-DNA contacts, but not histone NH(2) tail-DNA interactions. Stable remodeled nucleosomes, (obtained after detachment of SWI/SNF), displayed identical structural alterations with those bound to SWI/SNF. These results demonstrate a different in vitro remodeling of the HIV-1 nucleosome upon the binding of multiple transcription activators and of SWI/SNF complex.
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Affiliation(s)
- D Angelov
- Laboratoire de Biologie Moléculaire et Cellulaire de la Différenciation, équipe Mécanismes d'Assemblage du Matériel Génétique, INSERM U 309, France
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37
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Côté J, Cartier A, Robichaud P, Boutin H, Malo JL, Rouleau M, Boulet LP. Influence of asthma education on asthma severity, quality of life and environmental control. Can Respir J 2000; 7:395-400. [PMID: 11058207 DOI: 10.1155/2000/787980] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Several studies have examined the influence of asthma education, focusing mainly on the use of health services. OBJECTIVES To assess the influence of an asthma education program (AEP) on airway responsiveness, asthma symptoms, patient quality of life (QOL) and environmental control. DESIGN A prospective, randomized, controlled study with parallel groups. SETTING Three tertiary care hospitals in Quebec. POPULATION One hundred and eighty-eight patients with moderate to severe asthma. INTERVENTION After optimization of asthma treatment with inhaled corticosteroids, patients were randomly assigned to receive either an education program based on self-management (group E) or usual care (control group C). RESULTS One year after an AEP, there was a significant decrease in the number of days per month without daytime asthma symptoms in group E only (P=0.03). Asthma daily symptom scores decreased significantly in group E in comparison with group C (P=0. 006). QOL scores improved markedly in both groups after treatment optimization during the run-in period (P<0.01). After an AEP, the QOL score increased further in group E patients in comparison with group C patients (P=0.04). The concentration of methacholine that induces a 20% fall in forced expiratory volume in 1 s (PC20) improved significantly in both groups (group E 1.2+/-1.1 to 2.4+/-0. 2, group C 1.5+/-1.2 to 2.4+/-1.3, P<0.01). After one year, 26 of 37 patients from group E sensitized to house dust mites (HDM) adopted the specific measures recommended to reduce their exposure to HDM, while none of the 21 subjects from group C did (P<0.001). Among the patients sensitized to cats or dogs, 15% of patients from group E and 23% of patients in group C no longer had a pet at home at the final visit (P>0.5). CONCLUSIONS One year after the educational intervention, it was observed that the program had added value over and above that of optimization of medication and regular clinical follow-ups. The education program was highly effective in promoting HDM avoidance measures but minimally effective for removing domestic animals, suggesting that more efficient strategies need to be developed for the latter.
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Affiliation(s)
- J Côté
- Centre de pneumologie de l'hôpital Laval, Sainte-Foy, Canada.
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38
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Owen-Hughes T, Utley RT, Steger DJ, West JM, John S, Côté J, Havas KM, Workman JL. Analysis of nucleosome disruption by ATP-driven chromatin remodeling complexes. Methods Mol Biol 2000; 119:319-31. [PMID: 10804522 DOI: 10.1385/1-59259-681-9:319] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- T Owen-Hughes
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, USA
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39
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Galarneau L, Nourani A, Boudreault AA, Zhang Y, Héliot L, Allard S, Savard J, Lane WS, Stillman DJ, Côté J. Multiple links between the NuA4 histone acetyltransferase complex and epigenetic control of transcription. Mol Cell 2000; 5:927-37. [PMID: 10911987 DOI: 10.1016/s1097-2765(00)80258-0] [Citation(s) in RCA: 220] [Impact Index Per Article: 9.2] [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
NuA4 is an essential histone H4/H2A acetyltransferase complex that interacts with activators and stimulates transcription in vitro. We have identified three novel NuA4 subunits: Act3/Arp4, an actin-related protein implicated in epigenetic control of transcription, Act1, and Epl1, a protein homologous to Drosophila Enhancer of Polycomb. Act3/Arp4 binds nucleosomes in vitro and is required for NuA4 integrity in vivo. Mutations in ACT3 and acetyltransferase-encoding ESA1 cause gene-specific transcription defects. Accordingly, NuA4 is localized in precise loci within the nucleus and does not overlap with the silent chromatin marker Sir3. These data along with the known epigenetic roles of Act3/Arp4 and homologs of Epl1 and Esa1 strongly support an essential role for chromatin structure modification by NuA4 in transcription regulation in vivo.
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Affiliation(s)
- L Galarneau
- Laval University Cancer Research Center, Hôtel-Dieu de Québec (CHUQ), Canada
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40
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Côté J, Mathieu PA. Mapping of the human upper arm muscle activity with an electrode matrix. Electromyogr Clin Neurophysiol 2000; 40:215-23. [PMID: 10907599] [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] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Surface electrode matrices allow measurement of muscle activity while avoiding certain hazardous risks and inconvenience associated with invasive techniques. Major challenges of such equipment involve optimizing spatial resolution, and designing simple acquisition systems able to record simultaneously many potentials over large anatomical areas. We present a surface electromyography acquisition system comprising of 3 x 8 Ag-AgCl electrodes mounted onto an elastic band, which can be adjusted to fit an entire human upper limb segment. Using this equipment, we acquired a simultaneous representation of muscular activity from a segment of the upper limb surface of 6 healthy subjects during isometric contractions at various intensities. We found that the location of regions of highest activity depended on elbow torque direction but also varied among subjects. Signals obtained with such equipment can be used to solve the inverse problem and help optimize the electrode configuration in volume conduction studies. The efficacy of decision algorithms of multi-functional myoelectric prostheses can be tested with the global muscle activity patterns gathered. The electrode cuff could also be used in the investigation of fatigue and injury mechanisms during occupational activities.
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Affiliation(s)
- J Côté
- Département de physiologie, Université de Montréal, Québec, Canada
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41
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Abstract
Previous research has identified the relationship between athlete sport anxiety and various sport outcomes (e.g., performance and dropout). For the majority of athletes involved in sport, the coach is an influential element of the competitive experience. Two hundred and twenty-eight athletes from 15 sports, completed the Sport Anxiety Scale (SAS) and the Coaching Behavior Scale for Sport (CBS-S). The predictive ability of athletes' perceived frequency of seven coaching behaviours (physical training, mental preparation, goal setting, technical skills, competition strategies, personal rapport and negative personal rapport) on four forms of sport anxiety (total anxiety, somatic anxiety, concentration disruption and worry) was examined. Results indicate that negative personal rapport was a significant predictor of all measured forms of sport anxiety while competition strategies was a significant predictor for total anxiety, concentration disruption, and worry. Other behaviours were not significant. The findings suggest that negative rapport between coach and athlete is an important contributor to athlete anxiety. In addition, behaviours that the coach demonstrates relative to competition can be influential in reducing athlete anxiety.
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Affiliation(s)
- J Baker
- University of Queensland, Department of Human Movement Studies
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42
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Nadeau I, Garnier A, Côté J, Massie B, Chavarie C, Kamen A. Improvement of recombinant protein production with the human adenovirus/293S expression system using fed-batch strategies. Biotechnol Bioeng 2000; 51:613-23. [DOI: 10.1002/(sici)1097-0290(19960920)51:6<613::aid-bit1>3.0.co;2-k] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [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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43
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Bochar DA, Savard J, Wang W, Lafleur DW, Moore P, Côté J, Shiekhattar R. A family of chromatin remodeling factors related to Williams syndrome transcription factor. Proc Natl Acad Sci U S A 2000; 97:1038-43. [PMID: 10655480 PMCID: PMC15513 DOI: 10.1073/pnas.97.3.1038] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chromatin remodeling complexes have been implicated in the disruption or reformation of nucleosomal arrays resulting in modulation of transcription, DNA replication, and DNA repair. Here we report the isolation of WCRF, a new chromatin-remodeling complex from HeLa cells. WCRF is composed of two subunits, WCRF135, the human homolog of Drosophila ISWI, and WCRF180, a protein related to the Williams syndrome transcription factor. WCRF180 is a member of a family of proteins sharing a putative heterochromatin localization domain, a PHD finger, and a bromodomain, prevalent in factors involved in regulation of chromatin structure.
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Affiliation(s)
- D A Bochar
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA
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44
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Leblanc B, Duclos AJ, Bénard F, Côté J, Valiquette L, Paquin JM, Mauffette F, Faucher R, Perreault JP. Long-term followup of initial Ta grade 1 transitional cell carcinoma of the bladder. J Urol 1999; 162:1946-50. [PMID: 10569544 DOI: 10.1016/s0022-5347(05)68075-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE We evaluate the long-term outcome of initial Ta grade 1 transitional cell carcinoma. MATERIALS AND METHODS A total of 152 patients with initial Ta grade 1 bladder tumor were followed for a mean of 76 months (range 6 to 241). Recurrence was defined as positive findings on cystoscopy or biopsy. Progression was defined as an increase in tumor grade or stage. RESULTS Tumor recurrence in 83 of 152 patients (55%) was noted within 12 months of followup in 38 patients (46%), between 12 and 24 in 11 (13%), and between 24 and 60 in 22 (27%). A significant number of recurrences (12, 14%) were diagnosed more than 60 months after the first tumor. Of 83 patients with recurrence 31 (37%) had progression, including 21 to grade 2 and 2 to grade 3 disease. Carcinoma in situ was diagnosed in 3 patients and 5 had muscle invasive disease. Progression occurred more than 24 months after initial diagnosis in 20 patients and more than 60 months after first tumor event (2 had carcinoma in situ and 2 had muscle invasive disease) in 12. CONCLUSIONS Ta grade 1 bladder transitional cell carcinomas have a high recurrence rate and progression is not uncommon. These findings warrant close long-term followup, even when in some settings the trend is to discontinue followup after 5 years without any abnormal findings.
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Affiliation(s)
- B Leblanc
- Division of Urology, CHUM-Campus St-Luc, Montréal, Québec, Canada
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45
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Côté J, Pepler C. [Strategies for the effective care of patients with HIV infections]. Infirm Que 1999; 7:46-52. [PMID: 10948892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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46
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Allard S, Utley RT, Savard J, Clarke A, Grant P, Brandl CJ, Pillus L, Workman JL, Côté J. NuA4, an essential transcription adaptor/histone H4 acetyltransferase complex containing Esa1p and the ATM-related cofactor Tra1p. EMBO J 1999; 18:5108-19. [PMID: 10487762 PMCID: PMC1171581 DOI: 10.1093/emboj/18.18.5108] [Citation(s) in RCA: 362] [Impact Index Per Article: 14.5] [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: 11/12/2022] Open
Abstract
Post-translational acetylation of histone H4 N-terminal tail in chromatin has been associated with several nuclear processes including transcription. We report the purification and characterization of a native multisubunit complex (NuA4) from yeast that acetylates nucleosomal histone H4. NuA4 has an apparent molecular mass of 1.3 MDa. All four conserved lysines of histone H4 can be acetylated by NuA4. We have identified the catalytic subunit of the complex as the product of ESA1, an essential gene required for cell cycle progression in yeast. Antibodies against Esa1p specifically immunoprecipitate NuA4 activity whereas the complex purified from a temperature-sensitive esa1 mutant loses its acetyltransferase activity at the restrictive temperature. Additionally, we have identified another subunit of the complex as the product of TRA1, an ATM-related essential gene homologous to human TRRAP, an essential cofactor for c-Myc- and E2F-mediated oncogenic transformation. Finally, the ability of NuA4 to stimulate GAL4-VP16-driven transcription from chromatin templates in vitro is also lost in the temperature-sensitive esa1 mutant. The function of the essential Esa1 protein as the HAT subunit of NuA4 and the presence of Tra1p, a putative transcription activator-interacting subunit, supports an essential link between nuclear H4 acetylation, transcriptional regulation and cell cycle control.
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Affiliation(s)
- S Allard
- Laval University Cancer Research Center, Hôtel-Dieu de Québec, Quebec City, Canada G1R 2J6
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47
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Siegwart P, Côté J, Male K, Luong JH, Perrier M, Kamen A. Adaptive control at low glucose concentration of HEK-293 cell serum-free cultures. Biotechnol Prog 1999; 15:608-16. [PMID: 10441351 DOI: 10.1021/bp990077v] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [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
Fed-batch cultures were implemented to study the metabolism of HEK-293 cells. Glucose, measured every 30 min by a FIA biosensor system, was maintained at 1 mM throughout the culture using an adaptive nonlinear controller based on minimal process modeling. The controller performed satisfactorily at both low and high cell concentrations without the need for retuning between different culture phases. Overall, lactate production was significantly reduced by maintaining a low glucose concentration, thus decreasing the rate of glycolysis. The rates of glucose and glutamine uptake as well as the lactate and ammonia production were compared to those obtained in batch mode with an initial glucose concentration of 21 mM. Basically, three phases were observed in both culture modes. The metabolic shift from the first to the second phase was characterized by a significant reduction in glucose consumption and lactate production while maximum growth rate was maintained. The specific respiration rate appeared unchanged during the first two phases, suggesting that no change occurred in the oxidative pathway capacity. In the third phase, cell growth became slower very likely due to glutamine limitation.
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Affiliation(s)
- P Siegwart
- Biotechnology Research Institute, National Research Council Canada, 6100 Royalmount Avenue, Montréal, Québec, Canada, H4P 2R2, Département de génie chimique, Ecole Polytechnique, Université de Montréal, Case Postale 6079, Succursale centr
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48
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Steger DJ, Utley RT, Grant PA, John S, Eberharter A, Côté J, Owen-Hughes T, Ikeda K, Workman JL. Regulation of transcription by multisubunit complexes that alter nucleosome structure. Cold Spring Harb Symp Quant Biol 1999; 63:483-91. [PMID: 10384312 DOI: 10.1101/sqb.1998.63.483] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- D J Steger
- Howard Hughes Medical Institute, Pennsylvania State University, University Park 16802, USA
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49
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Côté J, Simard MJ, Chabot B. An element in the 5' common exon of the NCAM alternative splicing unit interacts with SR proteins and modulates 5' splice site selection. Nucleic Acids Res 1999; 27:2529-37. [PMID: 10352182 PMCID: PMC148457 DOI: 10.1093/nar/27.12.2529] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The neural cell adhesion molecule (NCAM) gene contains an 801 nt exon that is included preferentially in neuronal cells. We have set up an in vitro splicing system that mimics the neuro-specific alternative splicing profile of NCAM exon 18. Splicing regulation is observed using model pre-mRNAs that contain competing 5' or 3' splice sites, suggesting that distinct pathways regulate NCAM 5' and 3' splice site selection. While inclusion of exon 18 is the predom-inant choice in neuronal cells, an element in the 5' common exon 17 improves exon 17/exon 19 splicing in a neuronal cell line. A similar behavior is observed in vitro as the element can stimulate the 5' splice site of exon 17 or a heterologous 5' splice site. The minimal 32 nt sequence of the exon 17 enhancer consists of purine stretches and A/C motifs. Mutations in the purine stretches compromise the binding of SR proteins and decreases splicing stimulation in vitro. Mutations in the A/C motifs do not affect SR protein binding but reduce enhancing activity. Our results suggest that the assembly of an enhancer complex containing SR proteins in a 5' common exon ensures that NCAM mRNAs lacking exon 18 are made in neuronal cells.
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Affiliation(s)
- J Côté
- Département de Microbiologie et d'Infectiologie, Faculté de Médecine, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
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50
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Ohba R, Steger DJ, Brownell JE, Mizzen CA, Cook RG, Côté J, Workman JL, Allis CD. A novel H2A/H4 nucleosomal histone acetyltransferase in Tetrahymena thermophila. Mol Cell Biol 1999; 19:2061-8. [PMID: 10022893 PMCID: PMC83999 DOI: 10.1128/mcb.19.3.2061] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recently, we reported the identification of a 55-kDa polypeptide (p55) from Tetrahymena macronuclei as a catalytic subunit of a transcription-associated histone acetyltransferase (HAT A). Extensive homology between p55 and Gcn5p, a component of the SAGA and ADA transcriptional coactivator complexes in budding yeast, suggests an immediate link between the regulation of chromatin structure and transcriptional output. Here we report the characterization of a second transcription-associated HAT activity from Tetrahymena macronuclei. This novel activity is distinct from complexes containing p55 and putative ciliate SAGA and ADA components and shares several characteristics with NuA4 (for nucleosomal H2A/H4), a 1.8-MDa, Gcn5p-independent HAT complex recently described in yeast. A key feature of both the NuA4 and Tetrahymena activities is their acetylation site specificity for lysines 5, 8, 12, and 16 of H4 and lysines 5 and 9 of H2A in nucleosomal substrates, patterns that are distinct from those of known Gcn5p family members. Moreover, like NuA4, the Tetrahymena activity is capable of activating transcription from nucleosomal templates in vitro in an acetyl coenzyme A-dependent fashion. Unlike NuA4, however, sucrose gradient analyses of the ciliate enzyme, following sequential denaturation and renaturation, estimate the molecular size of the catalytically active subunit to be approximately 80 kDa, consistent with the notion that a single polypeptide or a stable subcomplex is sufficient for this H2A/H4 nucleosomal HAT activity. Together, these data document the importance of this novel HAT activity for transcriptional activation from chromatin templates and suggest that a second catalytic HAT subunit, in addition to p55/Gcn5p, is conserved between yeast and Tetrahymena.
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Affiliation(s)
- R Ohba
- Department of Biochemistry and Molecular Genetics, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA
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