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Leung E, Tremblay C, Liao D, Burnett M, Huang L, Sun SZ, Ko JJ. Treatment patterns and outcomes of patients with locally advanced vulvar or vaginal cancer in British Columbia. Gynecol Oncol 2023; 175:107-113. [PMID: 37348429 DOI: 10.1016/j.ygyno.2023.06.013] [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: 04/20/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/24/2023]
Abstract
OBJECTIVE As vulvar and vaginal cancers are rare malignancies, treatment is extrapolated from the cervical cancer field. Further studies are necessary to evaluate whether surgery, radiotherapy (RT), or combined chemoRT is most beneficial. METHODS A retrospective chart review was conducted on patients diagnosed with vulvar or vaginal cancer in 2000-2017. Descriptive statistics was used to summarize demographic factors. Kaplan-Meier curves, log-rank tests, multivariate analysis with hazard ratios (HR) were conducted to compare survival outcomes, including overall survival (OS), disease-free survival, and cancer-specific survival, between surgery, RT, and chemoRT. RESULTS This study included 688 patients with either vulvar (n = 560, 81%) or vaginal cancer (n = 128, 19%). Median age of diagnosis was 68 (27-98) years. In multivariate survival analysis, vulvar cancer was associated with more likelihood of death (HR: 1.50, p = 0.042) compared to vaginal cancer. For patients who received definitive RT, median OS was 63.8 months with concurrent chemotherapy vs. 46.3 months without for vulvar cancer (p = 0.75); for vaginal, median OS 100.4 with chemotherapy vs. 66.6 months without (p = 0.31). For vulvar cancer patients who received RT (n = 224), adding chemotherapy (n = 100) was not associated with statistically significant OS improvement (HR: 0.989, p = 0.957). Similarly, vaginal cancer patients who received chemoRT (n = 51) did not have significant OS benefit (HR: 0.720, p = 0.331) over patients who received RT (n = 49). CONCLUSIONS In this retrospective study, chemoRT was not associated with significant improvements in survival compared to RT in vulvar or vaginal cancer. Future studies investigating novel therapies to treat these cancers are needed to improve patient outcomes.
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Affiliation(s)
- Emily Leung
- Faculty of Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Cassia Tremblay
- Faculty of Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Donna Liao
- Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Madalon Burnett
- Faculty of Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Longlong Huang
- Department of Mathematics and Statistics, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada
| | - Shaun Z Sun
- Department of Mathematics and Statistics, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada; Department of Mathematics, Vancouver Island University, Nanaimo, BC V9R 5S5, Canada
| | - Jenny J Ko
- Faculty of Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Medical Oncology, BC Cancer - Abbotsford, Abbotsford, BC V2S 0CS, Canada.
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Rahayel S, Tremblay C, Vo A, Lehéricy S, Arnulf I, Vidailhet M, Corvol JC, Study Group I, Gagnon JF, Postuma R, Montplaisir J, Lewis S, Matar E, Ehgoetz Martens K, Borghammer P, Knudsen K, Monchi O, Misic B, Dagher A. Brain atrophy in REM sleep behavior disorder is shaped by gene expression and structural connectivity. Sleep Med 2022. [DOI: 10.1016/j.sleep.2022.05.603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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De Castro Hillmann E, Jordan L, Auclair MH, Zaryczny C, Tremblay C, Samouëlian V. Improving outcomes for benign and oncological gynecology surgery with ERAS pathway – A pre-post implementation cohort with 1839 patients. Clin Nutr ESPEN 2022. [DOI: 10.1016/j.clnesp.2022.06.034] [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]
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4
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Coupal D, Amjad A, Sadikov E, Fay A, Glass L, Hordos J, Liu D, Lukowich K, Marchant K, McKenzie J, McVicar L, Otitoju C, Penna S, Shaw J, Thakur-Singh V, Smith A, Tremblay C, Leong N. An Analysis of Learning Curve Effect on the Speed and Quality of High Dose Rate Prostate Brachytherapy Procedures. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.482] [Citation(s) in RCA: 1] [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: 11/26/2022]
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5
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Bourassa P, Tremblay C, Schneider JA, Bennett DA, Calon F. Brain mural cell loss in the parietal cortex in Alzheimer's disease correlates with cognitive decline and TDP-43 pathology. Neuropathol Appl Neurobiol 2020; 46:458-477. [PMID: 31970820 DOI: 10.1111/nan.12599] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 01/12/2020] [Accepted: 01/15/2020] [Indexed: 12/12/2022]
Abstract
AIMS Brain mural cells (BMC), smooth muscle cells and pericytes, interact closely with endothelial cells and modulate numerous cerebrovascular functions. A loss of BMC function is suspected to play a role in the pathophysiology of Alzheimer's Disease (AD). METHODS BMC markers, namely smooth muscle alpha actin (α-SMA) for smooth muscle cells, as well as platelet-derived growth factor receptor β (PDGFRβ) and aminopeptidase N (ANPEP or CD13) for pericytes, were assessed by Western immunoblotting in microvessel extracts from the parietal cortex of 60 participants of the Religious Orders study, with ages at death ranging from 75 to 98 years old. RESULTS Participants clinically diagnosed with AD had lower vascular levels of α-SMA, PDGFRβ and CD13. These reductions were correlated with lower cognitive scores for global cognition, episodic and semantic memory, perceptual speed and visuospatial ability. In addition, α-SMA, PDGFRβ and CD13 were negatively correlated with vascular Aβ40 concentrations. Vascular levels of BMC markers were also inversely correlated with insoluble cleaved phosphorylated transactive response DNA binding protein 43 (TDP-43) (25 kDa) and positively correlated with soluble cleaved phosphorylated TDP-43 (35 kDa) in cortical homogenates, suggesting strong association between BMC loss and cleaved phosphorylated TDP-43 aggregation. CONCLUSIONS The results of this study highlight a loss of BMC in AD. The associations between α-SMA, PDGFRβ and CD13 vascular levels with cognitive scores, TDP-43 aggregation and cerebrovascular accumulation of Aβ in the parietal cortex suggest that BMC loss contributes to both AD symptoms and pathology, further strengthening the link between cerebrovascular defects and dementia.
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Affiliation(s)
- P Bourassa
- Faculté de pharmacie, Université Laval, Québec, QC, Canada.,Axe Neurosciences, Centre de recherche du CHU de Québec, Université Laval, Québec, QC, Canada
| | - C Tremblay
- Axe Neurosciences, Centre de recherche du CHU de Québec, Université Laval, Québec, QC, Canada
| | - J A Schneider
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, USA
| | - D A Bennett
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, USA
| | - F Calon
- Faculté de pharmacie, Université Laval, Québec, QC, Canada.,Axe Neurosciences, Centre de recherche du CHU de Québec, Université Laval, Québec, QC, Canada
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6
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Boldeanu I, Sadouni M, Mansour S, Tremblay C, Durand M, Chartrand-Lefebvre C. SUBCLINICAL CORONARY ATHEROSCLEROSIS AMONG INDIVIDUALS WITH HIV ON ANTIRETROVIRAL THERAPY - PRELIMINARY RESULTS FROM THE CANADIAN HIV AND AGING COHORT STUDY (CHACS). Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.418] [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: 11/24/2022] Open
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7
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Isnard S, Ramendra R, Dupuy F, Mehraj V, Lin J, Kokinov N, Lebouché B, Costiniuk C, Ancuta P, Bernard N, Durand M, Tremblay C, Routy JP. Relevance of Reg3α and I-FABP on microbial translocation, inflammation and reservoir size in people living with HIV. J Virus Erad 2019. [DOI: 10.1016/s2055-6640(20)31030-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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8
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Caron NJ, Leclerc P, Houde AA, Tremblay C, Morissette C, Fleury N. LC-MS/MS urine drug screen targeting 220 substances in 175 illicit drug users in Montreal, Canada. Toxicologie Analytique et Clinique 2019. [DOI: 10.1016/j.toxac.2019.03.126] [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: 10/26/2022]
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Bogaty C, Lévesque S, Garenc C, Frenette C, Bolduc D, Galarneau LA, Lalancette C, Loo V, Tremblay C, Trudeau M, Vachon J, Dionne M, Villeneuve J, Longtin J, Longtin Y. Trends in the use of laboratory tests for the diagnosis of Clostridium difficile infection and association with incidence rates in Quebec, Canada, 2010-2014. Am J Infect Control 2017; 45:964-968. [PMID: 28549882 DOI: 10.1016/j.ajic.2017.04.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 02/08/2017] [Revised: 04/01/2017] [Accepted: 04/03/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND Several Clostridium difficile infection (CDI) surveillance programs do not specify laboratory strategies to use. We investigated the evolution in testing strategies used across Quebec, Canada, and its association with incidence rates. METHODS Cross-sectional study of 95 hospitals by surveys conducted in 2010 and in 2013-2014. The association between testing strategies and institutional CDI incidence rates was analyzed via multivariate Poisson regressions. RESULTS The most common assays in 2014 were toxin A/B enzyme immunoassays (EIAs) (61 institutions, 64%), glutamate dehydrogenase (GDH) EIAs (51 institutions, 53.7%), and nucleic acid amplification tests (NAATs) (34 institutions, 35.8%). The most frequent algorithm was a single-step NAAT (20 institutions, 21%). Between 2010 and 2014, 35 institutions (37%) modified their algorithm. Institutions detecting toxigenic C difficile instead of C difficile toxin increased from 14 to 37 (P < .001). Institutions detecting toxigenic C difficile had higher CDI rates (7.9 vs 6.6 per 10,000 patient days; P = .01). Institutions using single-step NAATs, GDH plus toxigenic cultures, and GDH plus cytotoxicity assays had higher CDI rates than those using an EIA-based algorithm (P < .05). CONCLUSIONS Laboratory detection of CDI has changed since 2010. There is an association between diagnostic algorithms and CDI incidence. Mitigation strategies are warranted.
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Affiliation(s)
- C Bogaty
- McGill University Faculty of Medicine, Montréal, QC, Canada
| | - S Lévesque
- Laboratoire de Santé Publique du Québec, Institute National de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Quebec (QC), Canada
| | - C Garenc
- Institut National de Santé Publique du Québec, Quebec City, QC, Canada; Centre Hospitalier Universitaire de Québec, Québec City, QC, Canada
| | - C Frenette
- McGill University Faculty of Medicine, Montréal, QC, Canada; McGill University Health Centre, Montréal, QC, Canada
| | - D Bolduc
- Centre intégré de santé et de services sociaux du Bas-Saint-Laurent, Rimouski, Quebec (QC), Canada
| | - L-A Galarneau
- Centre intégré universitaire de santé et de services sociaux de la Mauricie-et-du-Centre-du-Québec, Trois-Rivières, Quebec (QC), Canada
| | - C Lalancette
- Laboratoire de Santé Publique du Québec, Institute National de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Quebec (QC), Canada
| | - V Loo
- McGill University Faculty of Medicine, Montréal, QC, Canada; McGill University Health Centre, Montréal, QC, Canada
| | - C Tremblay
- Centre Hospitalier Universitaire de Québec, Québec City, QC, Canada; Laval University Faculty of Medicine, Quebec City, QC, Canada
| | - M Trudeau
- Laboratoire de Santé Publique du Québec, Institute National de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Quebec (QC), Canada
| | - J Vachon
- Centre intégré de santé et de services sociaux de Chaudière-Appalaches, Thetford Mines, Quebec (QC), Canada
| | - M Dionne
- Institut National de Santé Publique du Québec, Quebec City, QC, Canada
| | - J Villeneuve
- Institut National de Santé Publique du Québec, Quebec City, QC, Canada
| | - J Longtin
- Laboratoire de Santé Publique du Québec, Institute National de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Quebec (QC), Canada; Laval University Faculty of Medicine, Quebec City, QC, Canada.
| | - Y Longtin
- McGill University Faculty of Medicine, Montréal, QC, Canada
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Abstract
Adhesion molecules on endothelial cells play an important role in leukocyte recruitment in several inflammatory processes. Vascular selectins mediate the initial adhesion of leukocytes to the blood vessel wall during their extravasation into inflamed tissues, and in vitro studies in dogs have shown that selectin expression can be induced by cytokines such as tumor necrosis factor-α (TNF-α) and interleukin-1 (IL-1). The objective of this study was to determine whether vascular selectins are induced by cytokines in vivo in a cutaneous model of inflammation in dogs. Skin biopsies were collected from nine dogs at various time points after an intradermal injection of TNF-α (10 ng/site) or phosphate-buffered saline containing 0.1% bovine serum albumin, and immunohistochemistry was performed using anti-P-selectin (MD3) and anti-E-selectin (CL37) monoclonal antibodies. In all animals, TNF-α induced an inflammatory reaction that was maximal at 12 hours and then decreased by 24 and 48 hours. Control skin displayed no expression of E- and P-selectin, whereas TNF-α induced the expression of P-selectin and E-selectin on dermal vessels that was highest at 12 hours and 3 hours, respectively ( P < 0.05). Numerous platelet aggregates recognized by the anti-P-selectin antibody were present in the lumina of vessels and in perivascular tissues. These results demonstrate that TNF-α can induce the expression of P- and E-selectin in vivo in dog skin and suggest that these selectins are involved in leukocyte recruitment in canine dermatitis.
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Affiliation(s)
- C Tremblay
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, PQ, Canada
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Haley N, Lambert G, Gervais A, Tremblay C, Roy E, Frappier JY. Tobacco Use Among Adolescents Entering Quebec Youth Protection Centers. Paediatr Child Health 2016. [DOI: 10.1093/pch/21.supp5.e60c] [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: 11/13/2022] Open
Abstract
Abstract
BACKGROUND: Every year between 4,000 and 5,000 adolescents reside in Quebec Youth Protection Centers (YPCs). Many of these adolescents use tobacco products and other psychotropic substances that impact their present and future well-being.
OBJECTIVES: Document the prevalence of tobacco use among youth residing in YPCs and identify associated factors. Describe the measures taken to implement policies for smoke-free environments in YPCs and promote smoking cessation counseling for youth in care.
DESIGN/METHODS: Between July 2008 and May 2009, adolescents aged 14-17 living in six YPCs across Quebec were recruited on a volunteer basis to participate in a surveillance study on health risk behaviors. Data on socio-demographics, lifetime substance use and sexual risk behaviors, as well as certain health consequences related to these behaviors were obtained during structured, face-to-face interviews. An analysis of factors associated with daily tobacco use was carried out.
RESULTS: Data regarding behaviors reported during the year prior to admission were collected among 499 participants (boys: 59%; median age: boys: 16; girls: 15). Lifetime tobacco use was reported by 93% of girls and 91% of boys (median age at first cigarette was 12 years). During the year prior to admission, 15% of youth reported no tobacco use, and 20% smoked occasionally. Two thirds (65%) reported daily tobacco use, with 36% of girls and 43% of boys smoking 10 or more cigarettes a day. In univariate analysis, factors significantly (p<0.05) associated with daily smoking were: school failure or dropping out; family history of problematic alcohol or drug use; precocious initiation of alcohol use before age 13; history of regular use of alcohol or cannabis; problematic drug use (measured by DEP-ADO scale); having 6 or more lifetime sexual partners. Following dissemination of these results, measures were taken to develop a smoke-free policy and implementation plan for YPCs. Health professionals were trained to do brief interventions with all youth smokers entering care. In 2015 the YPC presented a brief to the provincial parlimentary committee on the Tobacco Act to support adoption of smoke-free policies for all health establishments in Québec.
CONCLUSION: Daily tobacco use is very prevalent among adolescents entering YPCs and the majority report problematic use of other psychoac-tive substances. Youth entering care merit screening for tobacco and drug use so that appropriate counseling can be initiated. Promoting policies that encourage smoke-free environments in child protection centers for both youth and the professionals working with them may greatly improve the chances for youth to live tobacco-free.
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Wacleche V, Cleret-Buhot A, Zhang Y, Planas D, Goulet J, Monteiro P, Niessl J, Gosselin A, Tremblay C, Jenabian M, Routy J, El-Far M, Chomont N, Haddad E, Sekaly R, Ancuta P. The transcriptional program governed by RORγt favors HIV-1 replication in CCR4 + CCR6 + Th17 cells. J Virus Erad 2015. [DOI: 10.1016/s2055-6640(20)31315-7] [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: 11/17/2022] Open
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13
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Tremblay C, Yoo S, Mertens L, Jacques F, Greenway S, Caldarone C, Coles J, Grosse-Wortmann L. COMPARISON OF THE SUTURELESS REPAIR TO THE CLASSICAL APPROACH FOR PULMONARY VEIN PATHOLOGIES: A PROSPECTIVE PILOT STUDY USING CARDIAC MAGNETIC RESONANCE. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.452] [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] Open
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14
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Tang CC, Isitman G, Bruneau J, Tremblay C, Bernard NF, Kent SJ, Parsons MS. Phenotypical and functional profiles of natural killer cells exhibiting matrix metalloproteinase-mediated CD16 cleavage after anti-HIV antibody-dependent activation. Clin Exp Immunol 2015; 181:275-85. [PMID: 25644502 DOI: 10.1111/cei.12593] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 01/08/2015] [Accepted: 01/14/2015] [Indexed: 01/01/2023] Open
Abstract
Natural killer (NK) cell-mediated antibody-dependent cellular cytotoxicity (ADCC) has been linked to protection from HIV infection and slower progression towards AIDS. However, antibody-dependent activation of NK cells results in phenotypical alterations similar to those observed on NK cells from individuals with progressive HIV infection. Activation of NK cells induces matrix metalloproteinase (MMP)-mediated cleavage of cell surface CD16. In the present study we assessed the phenotype and functional profile of NK cells exhibiting post-activation MMP-mediated CD16 cleavage. We found that NK cells achieving the highest levels of activation during stimulation exhibit the most profound decreases in CD16 expression. Further, we observed that educated KIR3DL1(+) NK cells from human leucocyte antigen (HLA)-Bw4-carrying donors exhibit larger decreases in CD16 expression post-activation than the KIR3DL1(-) NK cell subset containing cells educated via other inhibitory receptor/ligand combinations and non-educated NK cells. Lastly, we assessed the ex-vivo expression of CD16 on educated KIR3DL1(+) NK cells and the KIR3DL1(-) NK cell subset from HLA-Bw4-carrying HIV-uninfected and HIV-infected donors. Suggestive of in-vivo activation of KIR3DL1(+) NK cells during HIV infection, CD16 expression was higher on KIR3DL1(+) than KIR3DL1(-) NK cells in uninfected donors but similar on both subsets in HIV-infected donors. These results are discussed in the context of how they may assist with understanding HIV disease progression and the design of immunotherapies that utilize antibody-dependent NK cell responses.
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Affiliation(s)
- C-C Tang
- Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute, Melbourne, Victoria, Australia
| | - G Isitman
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - J Bruneau
- Centre de Recherche du Centre Hospitalier de l'Universite de Montreal (CRCHUM), Montreal, Quebec, Canada
| | - C Tremblay
- Centre de Recherche du Centre Hospitalier de l'Universite de Montreal (CRCHUM), Montreal, Quebec, Canada
| | - N F Bernard
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - S J Kent
- Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute, Melbourne, Victoria, Australia.,Melbourne Sexual Health Centre, Carlton, Victoria, Australia
| | - M S Parsons
- Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute, Melbourne, Victoria, Australia
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Lagares D, Ghassemi-Kakkaroodi P, Tremblay C, Wu J, Ahluwalia N, Probst C, Barry S, Black K, Montesi S, Blati M, Baron M, Fahmi H, Pardo A, Selman M, Pelletier JP, Martel-Pelletier J, Tager A, Kapoor M. OP0209 Soluble Ephrin-B2 Ectodomain Contributes to the Pathogenesis of Systemic Sclerosis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4726] [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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16
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Boulassel MR, Young M, Routy JP, Sekaly RP, Tremblay C, Rouleau D. Circulating Levels of IL-7 but not IL-15, IGF-1, and TGF-β Are Elevated During Primary HIV-1 Infection. HIV Clinical Trials 2015; 5:357-9. [PMID: 15562373 DOI: 10.1310/m0cv-r6bx-a9dp-jjv0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Tremblay C, Trottier B, Rachlis A, Baril J, Loutfy M, Lalonde R, Sampalis J, Boulerice F. Treatment Durability, Effectiveness, and Safety with Atazanavir/Ritonavir-Based HAART Regimen in Treatment-Naïve HIV-lnfected Patients. HIV Clinical Trials 2015; 12:151-60. [DOI: 10.1310/hct1203-151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Jenabian MA, Patel M, Kema I, Vyboh K, Kanagaratham C, Radzioch D, Thébault P, Lapointe R, Gilmore N, Ancuta P, Tremblay C, Routy JP. Soluble CD40-ligand (sCD40L, sCD154) plays an immunosuppressive role via regulatory T cell expansion in HIV infection. Clin Exp Immunol 2014; 178:102-11. [PMID: 24924152 DOI: 10.1111/cei.12396] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/05/2014] [Indexed: 12/22/2022] Open
Abstract
CD40/CD40-ligand (CD40L) signalling is a key stimulatory pathway which triggers the tryptophan (Trp) catabolizing enzyme IDO in dendritic cells and is immunosuppressive in cancer. We reported IDO-induced Trp catabolism results in a T helper type 17 (Th17)/regulatory T cell (Treg ) imbalance, and favours microbial translocation in HIV chronic infection. Here we assessed the link between sCD40L, Tregs and IDO activity in HIV-infected patients with different clinical outcomes. Plasmatic sCD40L and inflammatory cytokines were assessed in anti-retroviral therapy (ART)-naive, ART-successfully treated (ST), elite controllers (EC) and healthy subjects (HS). Plasma levels of Trp and its metabolite Kynurenine (Kyn) were measured by isotope dilution tandem mass spectrometry and sCD14 was assessed by enzyme-linked immunosorbent assay (ELISA). IDO-mRNA expression was quantified by reverse transcription-polymerase chain reaction (RT-PCR). The in-vitro functional assay of sCD40L on Treg induction and T cell activation were assessed on peripheral blood mononuclear cells (PBMCs) from HS. sCD40L levels in ART-naive subjects were significantly higher compared to ST and HS, whereas EC showed only a minor increase. In ART-naive alone, sCD40L was correlated with T cell activation, IDO-mRNA expression and CD4 T cell depletion but not with viral load. sCD40L was correlated positively with IDO enzymatic activity (Kyn/Trp ratio), Treg frequency, plasma sCD14 and inflammatory soluble factors in all HIV-infected patients. In-vitro functional sCD40L stimulation induced Treg expansion and favoured Treg differentiation by reducing central memory and increasing terminal effector Treg proportion. sCD40L also increased T cell activation measured by co-expression of CD38/human leucocyte antigen D-related (HLA-DR). These results indicate that elevated sCD40L induces immunosuppression in HIV infection by mediating IDO-induced Trp catabolism and Treg expansion.
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Affiliation(s)
- M-A Jenabian
- Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada; Research Institute, McGill University Health Centre, Montreal, QC, Canada
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19
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Haley N, Lambert G, Tremblay C, Frappier J, Otis J, Roy E. 195: Substance Use Profile of Adolescents Entering Quebec Youth Protection Centers. Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Tremblay C, Grantcharov T, Urquia M, Satkunaratnam A. Assessment Tool for Total Laparoscopic Hysterectomy: A Delphi Consensus Survey among International Experts. J Minim Invasive Gynecol 2013. [DOI: 10.1016/j.jmig.2013.08.291] [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: 10/26/2022]
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Fortin C, Labbé AC, Côté L, Fafard J, Delorme L, Trudelle A, Tremblay C, Serhir B. P2.070 No Misclassification of Syphilis Cases Using a Reverse Sequence Algorithm in Reactive Enzyme Immunoassay and Reactive RPR Samples When RPR Titer Above 1:2: Abstract P2.070 Table 1. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0335] [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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Lefebvre B, Labbé A, Venne S, Lambert G, Fortin C, Tremblay C. P2.089 Antimicrobial Susceptibility Profile of Neisseria GonorrhoeaeIsolates in the Province of Québec: 2012: Abstract P2.089 Table 1. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0353] [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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Serhir B, Vincelette J, Frost E, Bergevin M, Béliveau C, Phaneuf D, Sanfaçon R, Poirier A, Doualla-Bell F, Tremblay C. P2.037 Multicenter Evaluation of Three Novel 4 ThGeneration HIV Ag/Ab Combo Assays: Abbott Architect, Roche HIV Combi and Siemens Advia Centaur: Abstract P2.037 Table 1. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0302] [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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Sasseville VG, Mansfield KG, Mankowski JL, Tremblay C, Terio KA, Mätz-Rensing K, Gruber-Dujardin E, Delaney MA, Schmidt LD, Liu D, Markovits JE, Owston M, Harbison C, Shanmukhappa S, Miller AD, Kaliyaperumal S, Assaf BT, Kattenhorn L, Macri SC, Simmons HA, Baldessari A, Sharma P, Courtney C, Bradley A, Cline JM, Reindel JF, Hutto DL, Montali RJ, Lowenstine LJ. Meeting report: Spontaneous lesions and diseases in wild, captive-bred, and zoo-housed nonhuman primates and in nonhuman primate species used in drug safety studies. Vet Pathol 2012; 49:1057-69. [PMID: 23135296 PMCID: PMC4034460 DOI: 10.1177/0300985812461655] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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] [Indexed: 12/27/2022]
Abstract
The combination of loss of habitat, human population encroachment, and increased demand of select nonhuman primates for biomedical research has significantly affected populations. There remains a need for knowledge and expertise in understanding background findings as related to the age, source, strain, and disease status of nonhuman primates. In particular, for safety/biomedical studies, a broader understanding and documentation of lesions would help clarify background from drug-related findings. A workshop and a minisymposium on spontaneous lesions and diseases in nonhuman primates were sponsored by the concurrent Annual Meetings of the American College of Veterinary Pathologists and the American Society for Veterinary Clinical Pathology held December 3-4, 2011, in Nashville, Tennessee. The first session had presentations from Drs Lowenstine and Montali, pathologists with extensive experience in wild and zoo populations of nonhuman primates, which was followed by presentations of 20 unique case reports of rare or newly observed spontaneous lesions in nonhuman primates (see online files for access to digital whole-slide images corresponding to each case report at http://www.scanscope.com/ACVP%20Slide%20Seminars/2011/Primate%20Pathology/view.apml). The minisymposium was composed of 5 nonhuman-primate researchers (Drs Bradley, Cline, Sasseville, Miller, Hutto) who concentrated on background and spontaneous lesions in nonhuman primates used in drug safety studies. Cynomolgus and rhesus macaques were emphasized, with some material presented on common marmosets. Congenital, acquired, inflammatory, and neoplastic changes were highlighed with a focus on clinical, macroscopic, and histopathologic findings that could confound the interpretation of drug safety studies.
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Affiliation(s)
- V G Sasseville
- Novartis Institutes for Biomedical Research, 300 Technology Square, Cambridge, MA 02139, USA.
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Haley N, Lambert G, Jean S, Tremblay C, Frappier J, Otis J, Roy E. Sexual Heath of Adolescents in Quebec Youth Protection Centers. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.17ab] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Blanchard AC, Fortin E, Rocher I, Moore D, Frenette C, Tremblay C, Quach C. Central Line-Associated Bloodstream Infections in Neonatal Intensive Care Units. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.15a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Blouin V, Fortin E, Rocher I, Fortin A, Tremblay C, Frenette C, Quach C. Healthcare-associated (HA) bloodstream infections (BSI) secondary top surgical site infections: surveillance program across Quebec hospitals (2007 to 2010). BMC Proc 2011. [PMCID: PMC3239798 DOI: 10.1186/1753-6561-5-s6-p63] [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: 11/22/2022] Open
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Nassirou N, Diabate S, Akakpo J, Tremblay C, Alary M. P1-S2.15 Prevalence of condyloma acuminatum and certain sexually transmitted diseases among female sex workers (FSWS) in a cohort study at sexually transmitted diseases dispensary (DIST) in Cotonou, BEnin. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.72] [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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Diabate S, Chamberland A, Geraldo N, Zannou M, Massinga-Loembe M, Anagonou S, CLabbe A, Tremblay C, Alary M. P1-S2.20 Factors influencing cervical infection among female sex workers in Benin. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.77] [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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Cox J, Graves L, Marks E, Tremblay C, Stephenson R, Lambert-Lanning A, Steben M. Knowledge, attitudes and behaviours associated with the provision of hepatitis C care by Canadian family physicians. J Viral Hepat 2011; 18:e332-40. [PMID: 21692945 DOI: 10.1111/j.1365-2893.2010.01426.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The role of primary care physicians in providing care for hepatitis C virus (HCV) infection is increasingly emphasized, but many gaps and challenges remain. This study explores family physicians' knowledge, attitudes and practices associated with providing care for HCV infection. Seven hundred and forty-nine members of the College of Family Physicians of Canada (CFPC) completed a self-administered survey examining knowledge, attitudes and behaviours regarding HCV infection screening and care. Multivariate analyses were performed using the outcome, HCV care provision, and variables based on a conceptual model of practice guideline adherence. Family physicians providing basic-advanced HCV care were more likely to be older, practice in a rural setting, have injection drug users (IDU) in their practice and have higher levels of knowledge about the initial assessment (OR = 1.77; 95% CI = 1.23-2.54) and treatment of HCV (OR = 1.74; 95% CI = 1.24-2.43). They were also less likely to believe that family physicians do not have a role in HCV care (OR = 0.41; 95% CI = 0.30-0.58). Educational programmes should target physicians less likely to provide HCV care, namely family physicians practicing in urban areas and those who do not care for any IDU patients. Training and continuing medical education programmes that aim to shift family physicians' attitudes about the provision of HCV care by promoting their roles as integral to HCV care could contribute to easing the burden on consultant physicians and lead to improved access to treatment for HCV infection.
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Affiliation(s)
- J Cox
- McGill University, Montreal, QC, Canada.
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31
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Diabate S, Chamberland A, Geraldo N, Zannou DM, Loembe MM, Anagonou S, Labbe AC, Tremblay C, Alary M. O1-S08.03 Condom use during work time among female sex workers in Benin. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050109.45] [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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Lambert G, Haley N, Jean S, Tremblay C, Frappier JY, Otis J, Roy E. P1-S2.29 Risky sexual practices among youth in Quebec Care Centers. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.86] [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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Lambert G, Cox J, Hottes TS, Tremblay C, Frigault LR, Alary M, Otis J, Remis RS. Correlates of unprotected anal sex at last sexual episode: analysis from a surveillance study of men who have sex with men in Montreal. AIDS Behav 2011; 15:584-95. [PMID: 20033763 DOI: 10.1007/s10461-009-9605-3] [Citation(s) in RCA: 31] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recent increases in rates of unprotected anal sex (UAS) among men who have sex with men (MSM) signal the need to continually refine our understanding of factors associated with risky sexual behavior. Data were collected using a questionnaire eliciting information about the last sexual episode (LSE) with another man in the past 6 months. Logistic regression was used to identify both event-level and background correlates of UAS at LSE. 965 participants who reported having sex with a partner with whom they were not in a couple relationship at LSE were studied. Several event-level variables were significantly associated with UAS after adjusting for background factors, including finding the partner at LSE sexually attractive and using alcohol or cocaine at LSE. Our findings parallel the results of other HIV prevention studies which have highlighted the importance of interpersonal factors that influence risk-taking at the moment of a sexual act among MSM.
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Affiliation(s)
- G Lambert
- Direction de santé publique de Montréal, Agence de la santé et des services sociaux de Montréal, QC, Canada.
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Chamberland A, Sylla M, Boulassel MR, Baril JG, Côté P, Thomas R, Trottier B, Rouleau D, Routy JP, Tremblay C. Effect of antiretroviral therapy on HIV-1 genetic evolution during acute infection. Int J STD AIDS 2011; 22:146-50. [DOI: 10.1258/ijsa.2010.010292] [Citation(s) in RCA: 11] [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: 11/18/2022]
Abstract
The rapid evolution of HIV-1 is a major obstacle to viral eradication. Early antiretroviral therapy (ART) during primary HIV-1 infection could limit viral diversity. Eighteen patients recently infected with HIV-1 were selected. Nine initiated ART soon after enrolment and nine remained untreated. Replication-competent (RC) viruses were quantified at baseline and after one year of follow-up. Viral diversity in the C2V5 envelope region was evaluated from plasma, peripheral blood mononuclear cells (PBMCs), and cell culture at both time points. The amount of RC virus in the treated group declined (median −5.42 infectious units per million [IUPM]) while it remained stable or increased in the untreated group (median +0.87 IUPM). At one year post infection, we observed a significant increase in diversity for the C2V5 (+0.150%) region, specifically in the hypervariable loops V4 (+0.73%) and V5 (+0.77%), in the untreated group. More importantly, viral diversity did not significantly increase in treated individuals during the first year post infection. Genetic diversity during primary infection remains low through the first year of infection. Early treatment could contribute to a decrease in RC viruses from PBMCs and to limitation of viral diversification in the viral reservoir. These findings may have relevance for the rational design of specific immunotherapeutic strategies.
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Affiliation(s)
- A Chamberland
- Centre de Recherche du CHUM (CRCHUM)
- Université de Montréal, Montréal, Canada
| | - M Sylla
- Centre de Recherche du CHUM (CRCHUM)
- Université de Montréal, Montréal, Canada
| | | | | | - P Côté
- Centre de Recherche du CHUM (CRCHUM)
- Clinique Médicale du Quartier Latin
| | | | - B Trottier
- Centre de Recherche du CHUM (CRCHUM)
- Clinique Médicale l'Actuel
| | - D Rouleau
- Centre de Recherche du CHUM (CRCHUM)
- Université de Montréal, Montréal, Canada
| | | | - C Tremblay
- Centre de Recherche du CHUM (CRCHUM)
- Université de Montréal, Montréal, Canada
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Haidara A, Chamberland A, Sylla M, Aboubacrine SA, Cissé M, Traore HA, Maiga MY, Tounkara A, Nguyen VK, Tremblay C. High level of primary drug resistance in Mali. HIV Med 2010; 11:404-11. [PMID: 20146734 DOI: 10.1111/j.1468-1293.2009.00806.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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
BACKGROUND As access to antiretroviral drugs increases in developing countries, it will become increasingly important to monitor the emergence of resistance and to define the molecular pathways involved to identify optimal therapeutic regimens. METHODS We performed genotypic resistance testing on plasma obtained from 101 HIV-infected treatment-naïve individuals from Mali. Genotyping was carried out using the Virco protocols and HXB2 was used as the reference strain. RESULTS CRF02_AG was the most common subtype, present in 71.3% of our patient population. Other subtypes included B, C, G, CRF06_CPX, CRF09_CPX, CRF01_AE, A2/CRF16_A2D, A1 and CRF13_CPX. A total of 9.9% [95% confidence interval (CI) 6.9-12.9%] of patients had at least one resistance mutation. The prevalences of mutations conferring resistance to nucleoside reverse transcriptase inhibitors (NRTIs), nonnucleoside reverse transcriptase inhibitors (NNRTIs) and protease inhibitors (PIs) were 5% (95% CI 0.7-9.2%), 6% (95% CI 1.3-10.6%) and 0%, respectively. The most frequent mutations were T215A/Y for NRTIs and K103N/T for NNRTIs. One patient harboured three NRTI resistance mutations and one NNRTI mutation. This is the first reported case of multi-drug-resistant viral transmission in Mali. Polymorphisms at protease codons 10I/V and 33F potentially associated with resistance were observed in 18.8% and 1% of patients, respectively. Several polymorphisms in the C-terminal domain of reverse transcriptase were observed: A371V (in 63.4% of patients), G335D (76.2%), E399D (10.9%) and G333E (1%). CONCLUSION Primary resistance was seen in 9.9% of subjects, which is higher than previously reported in Mali. Taking into consideration other polymorphisms in protease such as L10I/V and 33F, primary resistance could reach 28.7% (95% CI 19.9-37.5%). Our study reflects the need to monitor the evolution of resistance on a regular basis and trends of transmitted resistance.
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Affiliation(s)
- A Haidara
- Département de Microbiologie et Immunologie, Université de Montréal, Montréal, Canada
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Pirkle CM, Boileau C, Nguyen VK, Machouf N, Ag-Aboubacrine S, Niamba PA, Drabo J, Koala S, Tremblay C, Rashed S. Impact of a modified directly administered antiretroviral treatment intervention on virological outcome in HIV-infected patients treated in Burkina Faso and Mali. HIV Med 2009; 10:152-6. [DOI: 10.1111/j.1468-1293.2008.00664.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [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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Phivilay A, Julien C, Tremblay C, Berthiaume L, Julien P, Giguère Y, Calon F. High dietary consumption of trans fatty acids decreases brain docosahexaenoic acid but does not alter amyloid-beta and tau pathologies in the 3xTg-AD model of Alzheimer's disease. Neuroscience 2008; 159:296-307. [PMID: 19135506 DOI: 10.1016/j.neuroscience.2008.12.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Revised: 12/04/2008] [Accepted: 12/06/2008] [Indexed: 01/21/2023]
Abstract
Dietary consumption of trans fatty acids (TFA) has increased during the 20th century and is a suspected risk factor for cardiovascular diseases. More recently, high TFA intake has been associated with a higher risk of developing Alzheimer's disease (AD). To investigate the impact of TFA on an animal model genetically programmed to express amyloid-beta (Abeta) and tau pathological markers of AD, we have fed 3xTg-AD mice with either control (0% TFA/total fatty acid), high TFA (16% TFA) or very high TFA (43% TFA) isocaloric diets from 2 to 16 months of age. Effects of TFA on plasma hepatic enzymes, glucose and lipid profile were minimal but very high TFA intake decreased visceral fat of non-transgenic mice. Importantly, dietary TFA increased brain TFA concentrations in a dose-related manner. Very high TFA consumption substantially modified the brain fatty acid profile by increasing mono-unsaturated fatty acids and decreasing polyunsaturated fatty acids (PUFA). Very high TFA intake induced a shift from docosahexaenoic acid (DHA, 22:6n-3) toward n-6 docosapentaenoic acid (DPA, 22:5n-6) without altering the n-3:n-6 PUFA ratio in the cortex of both control and 3xTg-AD mice. Changes in levels of Abeta(40), Abeta(42), tau protein, phosphorylated tau protein and synaptic markers were not statistically significant in the three groups of 3xTg-AD mice, despite a trend toward decreased insoluble tau in very high TFA-fed 3xTg-AD animals. In summary, TFA intake modulated brain fatty acid profiles but had no significant effect on major brain neuropathological hallmarks of AD in an animal model.
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Affiliation(s)
- A Phivilay
- Faculty of Pharmacy, Université Laval, 1050 de la Médecine Avenue, Québec, Québec, Canada G1V 0A6
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Mercier F, Boulassel MR, Yassine-Diab B, Tremblay C, Bernard NF, Sekaly RP, Routy JP. Persistent human immunodeficiency virus-1 antigenaemia affects the expression of interleukin-7Ralpha on central and effector memory CD4+ and CD8+ T cell subsets. Clin Exp Immunol 2008; 152:72-80. [PMID: 18279439 DOI: 10.1111/j.1365-2249.2008.03610.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Interleukin (IL)-7 and its receptor (IL-7Ralpha) play important roles in regulating lymphopoiesis. Previous studies have reported that human immunodeficiency virus-1 (HIV-1) viraemia affects the expression of IL-7Ralpha, but its effects on CD4+ and CD8+ T cell memory subsets have not been studied. Using eight-colour flow cytometry, we compared the immunophenotypic patterns of CD4+ and CD8+ T cell subsets expressing IL-7Ralpha and activation markers, as well as circulating IL-7 levels, in three well-defined groups of HIV-1-infected subjects: successfully treated, viraemic and long-term non-progressor (LTNP). Compared with successfully treated and LTNP subjects, viraemic patients had reduced expression of IL-7Ralpha on both CD4+ and CD8+ T cells, particularly on central and effector memory T cell compartments, and substantially elevated expression of activation markers on CD8+ T cell subsets. Circulating IL-7 levels were correlated negatively with the number of CD4+ and CD8+ T cell subsets expressing IL-7Ralpha; these associations were stronger with CD4+ T cell subsets and mainly with central and effector memory cells. The expression of activation markers on CD4+ and CD8+ cell T subsets was not related to circulating IL-7 levels. A strong negative correlation was observed between central memory CD4+ or CD8+ T cells expressing IL-7Ralpha and those expressing activation markers, independently of IL-7 levels. Collectively, these results provide further insight on the role of unsuppressed viral load in disrupting the IL-7/IL-7Ralpha system and contributing to HIV-1 disease progression.
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Affiliation(s)
- F Mercier
- Immunodeficiency Service, Montreal Chest Institute, Montreal, Quebec, Canada
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Ung RV, Lapointe NP, Tremblay C, Larouche A, Guertin PA. Spontaneous recovery of hindlimb movement in completely spinal cord transected mice: a comparison of assessment methods and conditions. Spinal Cord 2006; 45:367-79. [PMID: 16955071 DOI: 10.1038/sj.sc.3101970] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
STUDY DESIGN To compare results obtained with a variety of locomotor rating scales in Th9/10 spinal cord transected (Tx) mice. OBJECTIVES To assess spontaneous recovery with a variety of rating scales to find the most sensitive methods for assessing recovery levels in Tx mice and differences associated with gender and condition. SETTING Laval University Medical Center, Neuroscience Unit & Laval University, Department of Anatomy and Physiology, Quebec City, Quebec, Canada. METHODS Scales including the Basso, Beattie and Bresnahan (BBB), the Basso Mouse Score (BMS), the Antri, Orsal and Barthe (AOB), the Motor Function Score (MFS) and the Averaged Combined Score (ACOS) were used to assess, in open-field and treadmill conditions, spontaneous locomotor recovery in male and female Tx mice. RESULTS The ACOS scale revealed a progressive increase of spontaneous recovery during 5-weeks post-Tx. The other methods detected a progressive increase for the first 2-3 weeks post-Tx without any significant progress in weeks 4 and 5. Generally, scores obtained with each method were nonsignificantly different between males and females or between open-field and treadmill conditions. CONCLUSION These results further confirm the existence of a limited but significant increase of locomotor function recovery, occurring without intervention, in Tx animals. Although each method could detect small levels of recovery, the ACOS method was discriminative enough to detect progressive changes up to 5 weeks post-Tx. In conclusion, the ACOS rating scale was the most discriminative method for assessing the spontaneous return of hindlimb movements found in Tx mice, both in open-field and treadmill conditions.
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Affiliation(s)
- R V Ung
- Neuroscience Unit, Laval University Medical Center (CHUL--CHUQ), Laval University, Quebec City, Quebec, Canada
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41
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Tremblay C, Gingras L, Archambault L, Chrétien M, Martin A, Roy R, Beaulieu L. SU-FF-T-232: Characterization and Use of MOSFET as In Vivo Dosimeters under 192Ir Irradiation for Real-Time Quality Assurance. Med Phys 2005. [DOI: 10.1118/1.1997960] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Fecteau S, Carmant L, Tremblay C, Robert M, Bouthillier A, Théoret H. A motor resonance mechanism in children? Evidence from subdural electrodes in a 36-month-old child. Neuroreport 2005; 15:2625-7. [PMID: 15570165 DOI: 10.1097/00001756-200412030-00013] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The presence of a neural mechanism matching execution and observation of actions in the adult human brain is well established. In children, however, description of a resonance motor mechanism is still preliminary. In the present study, we recorded electroencephalographic signals from a subdural 64-contact grid electrode in a 36-month-old child with epilepsy. Spectral analysis was performed on sequences where the child drew with her right hand, watched an experimenter drawing with his right hand or was at rest. Contact sites corresponding to sensorimotor areas were discovered where absolute power was decreased during both observation and execution of hand/arm actions. These data suggest the presence of a mirror neuron system early in the developing brain.
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Affiliation(s)
- S Fecteau
- Département de psychologie, Université de Montréal, CP 6128, Succ. Centre-Ville, Montréal, Quebec H3C 3J7, Canada
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Lemiere C, Pelissier S, Tremblay C, Chaboillez S, Thivierge M, Stankova J, Rola-Pleszczynski M. Leukotrienes and isocyanate-induced asthma: a pilot study. Clin Exp Allergy 2005; 34:1684-9. [PMID: 15544591 DOI: 10.1111/j.1365-2222.2004.02102.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND The role of leukotrienes (LTs) in the pathophysiology of isocyanate-induced asthma is not well known. OBJECTIVE We sought to characterize the type of airway inflammation induced by exposure to isocyanates and to investigate whether exposure to isocyanates induced an increase in LT receptor cysteinyl leukotriene ((CysLT)(1), CysLT(2) and leukotriene B(4) receptor (BLT(1))) expression, as well as a release of LT (LTC(4) and leukotriene B(4) (LTB(4))) and IL-8 in both asthmatics with isocyanate-induced asthma and healthy subjects. METHODS We investigated eight subjects with isocyanate-induced asthma and eight healthy subjects. Both groups underwent specific inhalation challenges to isocyanates in the laboratory. Induced sputum was collected before and after exposure to isocyanates. CysLT(1), CysLT(2) and BLT(1) expression was assessed by flow cytometry, whereas LTC(4), LTB(4) and IL-8 were measured in the sputum supernatants by enzyme immunoassay. RESULTS Exposure to isocyanates induced an increase in sputum neutrophils only in subjects with occupational asthma. There was a significant increase in CysLT(1) and BLT(1) receptor expression, as well as a release of LTB(4) and IL-8 after exposure to isocyanates compared with the baseline, only in subjects with isocyanate-induced asthma, whereas there was no increase in LTC(4). Exposure to isocyanates did not induce any change in LT receptor expression nor in the levels of LTC(4), LTB(4) and IL-8, in healthy subjects. CONCLUSION The neutrophilia observed after exposure to isocyanates is likely to be related to the release of LTB(4), probably enhanced by the increased expression of BLT(1) on neutrophils as well as by the release of IL-8. The significance of the increase of CysLT1 receptor expression on neutrophils is unknown and needs further investigation.
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Affiliation(s)
- C Lemiere
- Department of Chest Medicine, Hôpital du Sacré-Coeur, Montreal, University of Montreal, QC, Canada.
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Weiss K, Low DE, Cortes L, Beaupre A, Gauthier R, Gregoire P, Legare M, Nepveu F, Thibert D, Tremblay C, Tremblay J. Clinical characteristics at initial presentation and impact of dual therapy on the outcome of bacteremic Streptococcus pneumoniae pneumonia in adults. Can Respir J 2004; 11:589-93. [PMID: 15611810 DOI: 10.1155/2004/461392] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [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: 11/18/2022] Open
Abstract
BACKGROUND Approximately 10% of patients hospitalized with community-acquired pneumonia (CAP) are bacteremic. Bacteremic Streptococcus pneumoniae pneumonia (BSPP) is the number one cause of mortality, representing up to 70% of all CAP deaths. In fact, all CAP guidelines have identified this issue as one of the most important issues when establishing their recommendations. OBJECTIVE To assess the impact of dual antibiotic therapy in patients with BSPP. PATIENTS AND METHODS All cases of BSPP in patients 18 years of age and older who were hospitalized from 1995 to 2000 were retrospectively analyzed. The standard initial therapeutic regimen used was cefuroxime with or without a macrolide from 1995 to 1997, and ceftriaxone and azithromycin or clarithromycin from 1998 to 2000. During the 1995 to 1997 period, only 16% of the patients initially received a macrolide, whereas all patients in the 1998 to 2000 period received a macrolide at admission. RESULTS Ninety-five patients (49 men, 46 women) with a mean age of 63 years (range 20 to 98 years) were included in the present study. The mean pneumonia severity index at admission was 113 for the monotherapy cohort and 114 for the dual therapy group. At admission, 30.5% of patients had a leukocyte count greater than 20 109/L, 11.5% had a systolic blood pressure less than 90 mmHg, 44.2% had a respiratory rate greater than 30 breaths/min and 33.6% had nausea/vomiting, necessitating some form of therapy or preventing the patient from eating. In addition, 16.8% had no fever at admission. Overall, 72.5% became afebrile within 48 h. Fifteen (15.8%) patients died (four within the first 72 h). The mortality rate was significantly higher in the monotherapy group (11 of 42 patients; 25.6%) than in the dual therapy cohort (four of 53 patients; 7.5%) (OR 0.23; 95% CI 0.07 to 0.74). Antibiotic resistance was not associated with increased mortality. CONCLUSION The combination of ceftriaxone plus a macrolide significantly reduced the mortality rate compared with monotherapy (cefuroxime) in patients with CAP that have the highest mortality rate.
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Affiliation(s)
- K Weiss
- Department of Microbiology and Infectious Diseases, Maisonneuve-Rosemont Hospital, University of Montreal, 5415 L'Assomption, Montreal, Quebec H1T 2M4, Canada.
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Tremblay C, Robert M, Pascual-Leone A, Lepore F, Nguyen DK, Carmant L, Bouthillier A, Théoret H. Action observation and execution: Intracranial recordings in a human subject. Neurology 2004; 63:937-8. [PMID: 15365160 DOI: 10.1212/01.wnl.0000137111.16767.c6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- C Tremblay
- Groupe de Recherche en Neuropsychologie et Cognition, Université de Montréal, Montréal, Québec, Canada
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Boulassel MR, Spurll G, Rouleau D, Tremblay C, Edwardes M, Sekaly RP, Lalonde R, Routy JP. Changes in immunological and virological parameters in HIV-1 infected subjects following leukapheresis. J Clin Apher 2003; 18:55-60. [PMID: 12874816 DOI: 10.1002/jca.10051] [Citation(s) in RCA: 28] [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: 11/06/2022]
Abstract
In order to assess immune responses during HIV-1 therapeutic immunization, a large number of blood mononuclear cells (PBMC) are needed. Clinical tolerance and safety, as well as changes in immunological and virological parameters, were assessed, following leukapheresis in HIV-1 infected subjects with CD4(+) cell count >200 x 10(6)/l. PBMC were collected using a Fenwal CS3000 cell separator in 29 subjects with mean CD4(+) cell counts of 503 x 10(6)/l (range 172-1,119) and viral load of 2.5 log(10) copies/ml (range <1.7-5.4). Twenty-four (83%) subjects were on antiretroviral therapy while 5 (17%) were untreated. The blood volume processed was 7 L over a period of 3 hours. A mean value (+/- standard error) of 82 +/- 26 x 10(9)/l lymphocytes was collected by a single apheresis in a mean volume of 200 +/- 1.8 ml, containing 9.0 +/- 1.3 x 10(9)/l CD4(+) and 10.2 +/- 1.3 x 10(9)/l CD8(+) cells. The leukapheresis procedures were well tolerated and no immediate or delayed side effects were observed within 90 days of follow-up. No changes from blood pre-leukapheresis values were detected for white blood cells, lymphocytes, monocytes, CD8(+), CD34(+), naive and memory CD4(+) cell counts immediately after, 1 h, 7 days, or within 90 days after leukapheresis. However, absolute CD4(+) cell counts and percentage significantly increased from pre-leukapheresis values after 1 h (530 +/- 43 vs. 700 +/- 75 cell x 10(6)/l; 32.6 +/- 1.6 vs. 36.9 +/- 1.9%; P < 0.001 for both paired t-tests) before returning to pre-leukapheresis levels on day 7. No significant changes in viral load from pre-leukapheresis levels in treated or untreated subjects were detected at any time points. We conclude that leukapheresis in HIV-1 infected subjects with CD4(+) cell counts >200 x 10(6)/l is safe and induces a transient increase in the absolute and percentage of CD4(+) cell count without enhancing viral replication.
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Affiliation(s)
- M R Boulassel
- Immunodeficiency Service, Royal Victoria Hospital, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
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Aumais G, Lefebvre M, Tremblay C, Bitton A, Martin F, Giard A, Madi M, Spénard J. Rectal tissue, plasma and urine concentrations of mesalazine after single and multiple administrations of 500 mg suppositories to healthy volunteers and ulcerative proctitis patients. Aliment Pharmacol Ther 2003; 17:93-7. [PMID: 12492737 DOI: 10.1046/j.1365-2036.2003.01409.x] [Citation(s) in RCA: 10] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVE Patients with ulcerative proctitis may have rectal mucosal properties different from healthy volunteers. This project compared the pharmacokinetics of rectally administered mesalazine in these two populations. METHODS In two separate studies, nine patients with ulcerative proctitis and 16 healthy volunteers received a single 500 mg mesalazine suppository and then 500 mg every 8 h for 5 days. Blood samples were collected for 12 h in healthy volunteers and 30 h in patients, and urine for 24 h in healthy volunteers and 30 h in patients. Rectal biopsies were performed 8 h after the last dose. RESULTS After a single dose to patients, mean mesalazine half-life (s.d.) was 5.0 (3.6) h. At steady-state, means (s.d.) were 89.1 (78.9) ng/mL for C(min), 361.1 (240.8) ng/mL for C(max), and 7.1 (7.3) h for half-life. Mean (range) rectal mesalazine concentrations were 167 (1.4-541.6) ng/mg tissue. After a single dose in healthy volunteers, mean (s.d.) half-life was 4.0 (4.7) h. At steady-state, means (s.d.) were 22.4 (61.6) ng/mL for C(min), 359.4 (166.3) ng/mL for C(max), and 0.9 (0.5) h for half-life. CONCLUSION Mesalazine is released in the rectum of patients, with a bioavailability of about 40%. Tissue distribution is also appreciable. Both parameters appear higher than in healthy volunteers.
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Affiliation(s)
- G Aumais
- Algorithme Pharma Inc., Montréal, Quebec, Canada
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Loisel P, Lemaire J, Poitras S, Durand MJ, Champagne F, Stock S, Diallo B, Tremblay C. Cost-benefit and cost-effectiveness analysis of a disability prevention model for back pain management: a six year follow up study. Occup Environ Med 2002; 59:807-15. [PMID: 12468746 PMCID: PMC1763600 DOI: 10.1136/oem.59.12.807] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.0] [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: 11/03/2022]
Abstract
AIMS To test the long term cost-benefit and cost-effectiveness of the Sherbrooke model of management of subacute occupational back pain, combining an occupational and a clinical rehabilitation intervention. METHODS A randomised trial design with four arms was used: standard care, occupational arm, clinical arm, and Sherbrooke model arm (combined occupational and clinical interventions). From the Quebec WCB perspective, a cost-benefit (amount of consequence of disease costs saved) and cost-effectiveness analysis (amount of dollars spent for each saved day on full benefits) were calculated for each experimental arm of the study, compared to standard care. RESULTS At the mean follow up of 6.4 years, all experimental study arms showed a trend towards cost benefit and cost effectiveness. These results were owing to a small number of very costly cases. The largest number of days saved from benefits was in the Sherbrooke model arm. CONCLUSIONS A fully integrated disability prevention model for occupational back pain appeared to be cost beneficial for the workers' compensation board and to save more days on benefits than usual care or partial interventions. A limited number of cases were responsible for most of the long term disability costs, in accordance with occupational back pain epidemiology. However, further studies with larger samples will be necessary to confirm these results.
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Affiliation(s)
- P Loisel
- Department of Surgery (Division of Orthopedics), Université de Sherbrooke and Centre de recherche clinique en réadaptation au travail PREVICAP, Hôpital Charles LeMoyne, 1111, Longueuil, Québec, Canada, J4K 5G4.
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Allard-Dansereau C, Tremblay C, Hébert M, Bernard-Bonnin AC. Predictors of Coping in Sexually Abused Girls. Paediatr Child Health 2002. [DOI: 10.1093/pch/7.suppl_a.25a] [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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Tremblay C. [Pregnancy in adolescence: better understanding for a better intervention]. Infirm Que 2001; 9:43-50. [PMID: 12152593] [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: 02/26/2023]
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