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Ruiz de Luzuriaga A, Solera G, Azcarate-Ascasua I, Boucher V, Grande HJ, Rekondo A. Chemical control of the aromatic disulfide exchange kinetics for tailor-made epoxy vitrimers. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124457] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ouellet V, Boucher V, Beauchamp F, Neveu X, Archambault P, Berthelot S, Chauny JM, De Guise E, Émond M, Frenette J, Lang E, Lee J, Mercier, Moore L, Ouellet MC, Perry J, Le Sage N. Influence of concomitant injuries on post-concussion symptoms after a mild traumatic brain injury - a prospective multicentre cohort study. Brain Inj 2021; 35:1028-1034. [PMID: 34224275 DOI: 10.1080/02699052.2021.1945145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Objectives: To compare post-concussion symptoms (PCS) and return to normal activities between mild Traumatic Brain Injury (mTBI) patients with or without concomitant injuries at 7-and 90 days post-mTBI.Methods: Design: Sub-analysis of a multicentre prospective cohort study. PARTICIPANTS AND SETTING patients with mTBI from 7 Canadian Emergency Departments. PROCEDURE Research assistants conducted telephone follow-ups using the Rivermead Postconcussion Symptoms Questionnaire (RPQ) at 7-, 30- and 90 days post-mTBI. MAIN OUTCOME Presence of PCS (RPQ: ≥3 symptoms) at 90 days. SECONDARY OUTCOMES RPQ score ≥21, prevalence of individual RPQ symptoms and patients' return to normal activities, at 7- and 90-days. Adjusted risk ratios (RR) were calculated.Results: 1725 mTBI patients were included and 1055 (61.1%) had concomitant injuries. Patients with concomitant injuries were at higher risk of having ≥3 symptoms on the RPQ (RR:1.26 [95% CI 1.01-1.58]) at 90 days. They were also at higher risk of experiencing specific symptoms (dizziness, fatigue, headaches and taking longer to think) and of non-return to their normal activities (RR:2.11 [95% CI 1.30-3.45]).Conclusion: Patients with concomitant injuries have slightly more PCS and seemed to be at higher risk of non-return to their normal activities 90 days, compared to patients without concomitant injuries.
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Affiliation(s)
- V Ouellet
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
| | - V Boucher
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada
| | - F Beauchamp
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
| | - X Neveu
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada
| | - P Archambault
- Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada.,Centre Intégré De Santé Et De Services Sociaux De Chaudière-Appalaches, Centre Hospitalier Affilié Universitaire Hôtel-Dieu De Lévis, Lévis (Quebec) Canada
| | - S Berthelot
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
| | - J M Chauny
- Université De Montréal, Montréal, Québec, Canada
| | - E De Guise
- Université De Montréal, Montréal, Québec, Canada.,Research-Institute, McGill University Health CentreMontreal, Quebec, Canada.,Centre De Recherche Interdisciplinaire En Réadaptation Du Montréal Métropolitain (CRIR), Montreal, Quebec, Canada
| | - M Émond
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
| | - J Frenette
- Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada
| | - E Lang
- University of Calgary, Calgary, Alberta, Canada
| | - J Lee
- Schwartz/Reisman Emergency Medicine Institute, Toronto, Ontario, Canada
| | - Mercier
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
| | - L Moore
- Department of Social and Preventive Medicine, Faculté De Médecine, Université Laval Québec Canada
| | - M C Ouellet
- Département De Psychologie, Université Laval Québec Canada.,Centre Interdisciplinaire De Recherche En Réadaptation Et Intégration Sociale CIRRIS, Quebec, Canada
| | - J Perry
- Department of Emergency Medicine, Ottawa Hospital Research Institute, University of Ottawa Ottawa Canada
| | - N Le Sage
- CHU De Québec-Université Laval Research Center, Quebec, Canada.,Centre De Recherche Sur Les Soins Et Les Services De Première Ligne De l'Université Laval (CERSSPL-UL), Canada.,Département De Médecine Familiale Et De Médecine D'urgence, Faculté De Médecine, Université Laval Québec Canada
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Expert D, Patrit O, Shevchik VE, Perino C, Boucher V, Creze C, Wenes E, Fagard M. Dickeya dadantii pectic enzymes necessary for virulence are also responsible for activation of the Arabidopsis thaliana innate immune system. Mol Plant Pathol 2018; 19:313-327. [PMID: 27925401 PMCID: PMC6638122 DOI: 10.1111/mpp.12522] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 11/18/2016] [Accepted: 11/25/2016] [Indexed: 06/06/2023]
Abstract
Soft-rot diseases of plants attributed to Dickeya dadantii result from lysis of the plant cell wall caused by pectic enzymes released by the bacterial cell by a type II secretion system (T2SS). Arabidopsis thaliana can express several lines of defence against this bacterium. We employed bacterial mutants with defective envelope structures or secreted proteins to examine early plant defence reactions. We focused on the production of AtrbohD-dependent reactive oxygen species (ROS), callose deposition and cell death as indicators of these reactions. We observed a significant reduction in ROS and callose formation with a bacterial mutant in which genes encoding five pectate lyases (Pels) were disrupted. Treatment of plant leaves with bacterial culture filtrates containing Pels resulted in ROS and callose production, and both reactions were dependent on a functional AtrbohD gene. ROS and callose were produced in response to treatment with a cellular fraction of a T2SS-negative mutant grown in a Pels-inducing medium. Finally, ROS and callose were produced in leaves treated with purified Pels that had also been shown to induce the expression of jasmonic acid-dependent defence genes. Pel catalytic activity is required for the induction of ROS accumulation. In contrast, cell death observed in leaves infected with the wild-type strain appeared to be independent of a functional AtrbohD gene. It was also independent of the bacterial production of pectic enzymes and the type III secretion system (T3SS). In conclusion, the work presented here shows that D. dadantii is recognized by the A. thaliana innate immune system through the action of pectic enzymes secreted by bacteria at the site of infection. This recognition leads to AtrbohD-dependent ROS and callose accumulation, but not cell death.
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Affiliation(s)
- Dominique Expert
- Laboratoire Interactions Plantes–PathogènesInstitut National de la Recherche Agronomique/AgroParisTech/Université Pierre et Marie Curie, 16 rue Claude Bernard 75231Cedex 05 ParisFrance
- lnstitut Jean‐Pierre Bourgin, UMR1318 Institut National de la Recherche Agronomique, AgroParisTech, ERL3559 Centre National de la Recherche Scientifique, Université Paris‐Saclay, RD1078026Versailles CedexFrance
| | - Oriane Patrit
- Laboratoire Interactions Plantes–PathogènesInstitut National de la Recherche Agronomique/AgroParisTech/Université Pierre et Marie Curie, 16 rue Claude Bernard 75231Cedex 05 ParisFrance
| | - Vladimir E. Shevchik
- Université Claude Bernard Lyon 1, F‐69622 Villeurbanne, France; INSA‐Lyon, F‐69621 Villeurbanne, France; CNRS UMR5240 Microbiologie, Adaptation et PathogénieF‐69622 VilleurbanneFrance
| | - Claude Perino
- Laboratoire Interactions Plantes–PathogènesInstitut National de la Recherche Agronomique/AgroParisTech/Université Pierre et Marie Curie, 16 rue Claude Bernard 75231Cedex 05 ParisFrance
| | - Virginie Boucher
- Laboratoire Interactions Plantes–PathogènesInstitut National de la Recherche Agronomique/AgroParisTech/Université Pierre et Marie Curie, 16 rue Claude Bernard 75231Cedex 05 ParisFrance
- Present address:
Ecole Normale SupérieureInstitut de Biologie de l'ENS IBENS75005ParisFrance
| | - Christophe Creze
- Bases of Infectious Diseases, CNRS, UMR 5086F‐69367Lyon Cedex 07France
| | - Estelle Wenes
- lnstitut Jean‐Pierre Bourgin, UMR1318 Institut National de la Recherche Agronomique, AgroParisTech, ERL3559 Centre National de la Recherche Scientifique, Université Paris‐Saclay, RD1078026Versailles CedexFrance
| | - Mathilde Fagard
- lnstitut Jean‐Pierre Bourgin, UMR1318 Institut National de la Recherche Agronomique, AgroParisTech, ERL3559 Centre National de la Recherche Scientifique, Université Paris‐Saclay, RD1078026Versailles CedexFrance
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Giroux M, Émond M, Sirois M, Boucher V, Daoust R, Gouin E, Pelletier M, Berthelot S. ASSOCIATION BETWEEN ED-INDUCED DELIRIUM AND COGNITIVE AND FUNCTIONAL DECLINE IN SENIORS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. Giroux
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
- Centre d’excellence vieillissment de Québec, Québec, Quebec, Canada,
| | - M. Émond
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
- Centre d’excellence vieillissment de Québec, Québec, Quebec, Canada,
| | - M. Sirois
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
- Centre d’excellence vieillissment de Québec, Québec, Quebec, Canada,
| | - V. Boucher
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Centre d’excellence vieillissment de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
| | - R. Daoust
- CIUSSS Nord-de-l’ile-de-Montréal, Québec, Quebec, Canada,
- Université de montréal, Québec, Quebec, Canada,
| | - E. Gouin
- CIUSSS Mauricie-Centre-du-Québec, Québec, Quebec, Canada,
| | | | - S. Berthelot
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
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Giroux M, Émond M, Sirois M, Boucher V, Daoust R, Gouin E, Pelletier M, Berthelot S. FRAILTY ASSESSMENT TO HELP PREDICT PATIENTS AT RISK OF ED-INDUCED DELIRIUM. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. Giroux
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Centre d’excellence du Vieillissement de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
| | - M. Émond
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Centre d’excellence du Vieillissement de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
| | - M. Sirois
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Centre d’excellence du Vieillissement de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
| | - V. Boucher
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Centre d’excellence du Vieillissement de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
| | - R. Daoust
- Université de Montréal, Québec, Quebec, Canada,
- CIUSSS du Nord-de-l’ile-de-Montreal, Québec, Quebec, Canada,
| | - E. Gouin
- CIUSSS Mauricie-centre-du-Québec, Quebec, Quebec, Canada,
| | | | - S. Berthelot
- Readaptation, CHU de Québec, Québec, Quebec, Canada,
- Université Laval, Québec, Quebec, Canada,
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Caucheteux A, Es Sabar A, Boucher V. Occupancy measurement in building: A litterature review, application on an energy efficiency research demonstrated building. Int J Metrol Qual Eng 2013. [DOI: 10.1051/ijmqe/2013044] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Measuring the energy efficiency of buildings and its confrontation with the current Building Energy Simulations now faces knowledge of what is commonly called “occupancy”. This work has been made in order to implement a monitoring system on a research demonstrator building at DLRCA in Angers (France). The goals were first to know the occupancy as input data of models but also to build occupancy models. Occupancy can be defined as all the action of occupants that affect building energy efficiency. The chosen monitoring deals with its presence, lightning, windows opening and internal gains. It seems that the use of an Infra- red detector allows a accuracy of 5 min in the detection of presence. The use of dry contact sensors allows the detection of five different rates of slide windows opening that can affect temperature decrease. Light sensors seem to be efficient to detect artificial lighting states when correctly configured.
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Charbonneau V, Laramée ME, Boucher V, Bronchti G, Boire D. Cortical and subcortical projections to primary visual cortex in anophthalmic, enucleated and sighted mice. Eur J Neurosci 2012; 36:2949-63. [PMID: 22780435 DOI: 10.1111/j.1460-9568.2012.08215.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [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
The purpose of this study was to identify and compare the afferent projections to the primary visual cortex in intact and enucleated C57BL/6 mice and in ZRDCT/An anophthalmic mice. Early loss of sensory-driven activity in blind subjects can lead to activations of the primary visual cortex by haptic or auditory stimuli. This intermodal activation following the onset of blindness is believed to arise through either unmasking of already present cortical connections, sprouting of novel cortical connections or enhancement of intermodal cortical connections. Studies in humans have similarly demonstrated heteromodal activation of visual cortex following relatively short periods of blindfolding. This suggests that the primary visual cortex in normal sighted subjects receives afferents, either from multisensory association cortices or from primary sensory cortices dedicated to other modalities. Here cortical afferents to the primary visual cortex were investigated to determine whether the visual cortex receives sensory input from other modalities, and whether differences exist in the quantity and/or the structure of projections found in sighted, enucleated and anophthalmic mice. This study demonstrates extensive direct connections between the primary visual cortex and auditory and somatosensory areas, as well as with motor and association cortices in all three animal groups. This suggests that information from different sensory modalities can be integrated at early cortical stages and that visual cortex activations following visual deprivations can partly be explained by already present intermodal corticocortical connections.
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Affiliation(s)
- Valérie Charbonneau
- Groupe de Recherche en Neurosciences, Département de chimie-biologie, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
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Boucher V, Buitink J, Lin X, Boudet J, Hoekstra FA, Hundertmark M, Renard D, Leprince O. MtPM25 is an atypical hydrophobic late embryogenesis-abundant protein that dissociates cold and desiccation-aggregated proteins. Plant Cell Environ 2010; 33:418-30. [PMID: 20002332 DOI: 10.1111/j.1365-3040.2009.02093.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Late embryogenesis-abundant (LEA) proteins are one of the components involved in desiccation tolerance (DT) by maintaining cellular structures in the dry state. Among them, MtPM25, a member of the group 5 is specifically associated with DT in Medicago truncatula seeds. Its function is unknown and its classification as a LEA protein remains elusive. Here, evidence is provided that MtPM25 is a hydrophobic, intrinsically disordered protein that shares the characteristics of canonical LEA proteins. Screening protective activities by testing various substrates against freezing, heating and drying indicates that MtPM25 is unable to protect membranes but able to prevent aggregation of proteins during stress. Prevention of aggregation was also found for the water soluble proteome of desiccation-sensitive radicles. This inhibition was significantly higher than that of MtEM6, one of the most hydrophilic LEA protein associated with DT. Moreover, when added after the stress treatment, MtPM25 is able to rapidly dissolve aggregates in a non-specific manner. Sorption isotherms show that when it is unstructured, MtPM25 absorbs up to threefold more water than MtEM6. MtPM25 is likely to act as a protective molecule during drying and plays an additional role as a repair mechanism compared with other LEA proteins.
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Affiliation(s)
- Virginie Boucher
- Université d'Angers, INRA, Agrocampus-Ouest, UMR1191 Physiologie Moléculaire des Semences, 16 Bd Lavoisier, F-49045 Angers, France
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Fagard M, Dellagi A, Roux C, Périno C, Rigault M, Boucher V, Shevchik VE, Expert D. Arabidopsis thaliana expresses multiple lines of defense to counterattack Erwinia chrysanthemi. Mol Plant Microbe Interact 2007; 20:794-805. [PMID: 17601167 DOI: 10.1094/mpmi-20-7-0794] [Citation(s) in RCA: 64] [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] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Many taxonomically diverse plant species are attacked by Erwinia chrysanthemi, a member of the causal agents of soft-rotting diseases. Symptom development is due to the collective action of pectin-degrading enzymes secreted by the bacterium through a type II secretion system (T2SS). Using Arabidopsis thaliana as a susceptible host, we show that plants respond to E. chrysanthemi 3937 by expressing cell-wall reactions, production of an oxidative burst, and activation of salicylic acid (SA) and jasmonic acid (JA) or ethylene (ET) signaling pathways. We found that the oxidative burst is mainly generated via the expression of the AtrbohD gene, constitutes a barrier of resistance to bacterial attack, and acts independently of the SA-mediated response. To determine the importance of T2SS-secreted proteins in elicitation of these defenses, we used a T2SS deficient mutant and purified enzymatic preparations of representative members of strain 3937 pectate lyase activity. The T2SS-secreted proteins were responsible only partially for the activation of SA and JA or ET signaling pathways observed after infection with the wild-type bacterium and were not involved in the expression of other identified defense reactions. Our study shows the differential role played by pectate lyases isoenzymes in this process and highlights the complexity of the host immune network, which is finely controlled by the bacterium.
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Affiliation(s)
- Mathilde Fagard
- Laboratoire Interactions Plantes-Pathogènes, UMR 217 INRA/INA P-G/Universitè Paris 6 and CNRS, 16 rue Claude Bernard, Paris 75005, France
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Leprince O, Boudet J, Hoekstra F, Lin X, Boucher V, Aubry C, Buitink J. Proteomic profiling and structure–function analysis of late embryogenesis abundant (LEA) proteins associated with desiccation tolerance in the legume seed Medicago truncatula. Comp Biochem Physiol A Mol Integr Physiol 2007. [DOI: 10.1016/j.cbpa.2007.01.310] [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: 10/23/2022]
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Leblanc K, Sexton E, Parent S, Bélanger G, Déry MC, Boucher V, Asselin E. Effects of 4-hydroxytamoxifen, raloxifene and ICI 182 780 on survival of uterine cancer cell lines in the presence and absence of exogenous estrogens. Int J Oncol 2007; 30:477-87. [PMID: 17203231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023] Open
Abstract
The impact of 17beta-estradiol and antiestrogens on uterine cancer cells is poorly understood. The aim of this study was to determine the impact of 17beta-estradiol, 4-hydroxytamoxifen, raloxifene and ICI 182 780 on the cell proliferation of six uterine cancer cell lines: HeLa, HEC-1-A, KLE, RL-95-2, Ishikawa and EN-1078D. The effects of these compounds on the cell proliferation of the six uterine cancer cell lines were studied in the presence and absence of estrogens (phenol red and serum deprivation of sex steroids). In a general manner, 17beta-estradiol and 4-hydroxytamoxifen showed similarities in their effects whereas raloxifene showed a different pattern of cell proliferation (agonistic and antagonistic) and ICI 182 780 had antagonistic activity. In the presence and absence of estrogens, we observed that each cell line had diverse expression of ERalpha, ERbeta, GPR30 and REA. GPR30 mRNA expression was significantly reduced in a serum/phenol-free medium. REA mRNA expression was not influenced by the media. Results demonstrated the importance of removing phenol red and the use of deprived serum when studying uterine cancer cells in relationship with 17beta-estradiol and antiestrogens. The affinity of each compound to the binding of ERalpha and ERbeta was very similar with the exception of raloxifene that had a preference for ERalpha binding. Akt phosphorylation/activity was reduced in cells cultured in a phenol red- and steroid-free culture medium indicating that the presence of steroids in the culture media can influence the activity of this survival pathway. Our results suggest that the expression of ERalpha, ERbeta and GPR30 are influenced by sex steroids and might play a role in the response of cells to 17beta-estradiol and antiestrogens but are not the only factors involved in this process.
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Affiliation(s)
- Kim Leblanc
- Department of Chemistry and Biology, Research Group in Cellular and Molecular Biopathology, University of Quebec in Trois-Rivieres, Quebec G9A 5H7, Canada
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Boucher V, Leblond H, Nguyen-Phu X. Polarization switching in a planar optical waveguide. Phys Rev E Stat Nonlin Soft Matter Phys 2003; 68:056604. [PMID: 14682903 DOI: 10.1103/physreve.68.056604] [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] [Subscribe] [Scholar Register] [Received: 02/10/2003] [Indexed: 11/07/2022]
Abstract
The multiscale expansion formalism is applied to the study of nonlinear planar optical waveguides. It allows us to describe the linear and nonlinear propagation for both transverse electric and transverse magnetic modes, and the interaction between them. An accurate computation of the nonlinear self- and cross-phase modulation coefficients allows one to give account of the polarization switching which has been observed experimentally.
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Affiliation(s)
- V Boucher
- Laboratoire POMA, UMR CNRS 6136, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
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Boucher V, Lamontagne M. Effects of speaking rate on the control of vocal fold vibration: clinical implications of active and passive aspects of devoicing. J Speech Lang Hear Res 2001; 44:1005-1014. [PMID: 11708522 DOI: 10.1044/1092-4388(2001/079)] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Stevens (1991) has suggested that, while speakers control glottal apertures in producing consonants, the buildup of intraoral pressure during an oral closure creates decreases in transglottal flow, which can, in itself, reduce or halt vocal fold vibrations. The object of this study was to determine whether speakers can take advantage of such pressure effects in controlling the voicing attributes of intervocalic stops. Intraoral pressure, vocal fold vibration (Lx portions of electroglottograms), and electromyographic (EMG) activity of the orbicularis oris inferior were monitored for 6 subjects while they produced at "slow," "normal," and "fast" speaking rates utterances containing intervocalic stops /p/ and /b/. Product-moment correlations between the intervocalic pressure rises and the amplitude contour of Lx showed strong negative relationships at normal-to-fast rates of speech. However, this relationship was not maintained at slower rates, where decreases in the amplitude of Lx sometimes occurred before the onset of EMG activity in the labial adductor. The findings suggest that, at normal-to-fast rates of speech, speakers can use the passive effects of pressure in controlling vocal fold vibration for stop consonants.
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Affiliation(s)
- V Boucher
- University of Ottawa, Ontario, Canada.
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Boucher V, Langlois F, Laurent J, Herman D. [Desensitization]. Rev Infirm 1996:22-26. [PMID: 8868862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lorès P, Boucher V, Mackay C, Pla M, Von Boehmer H, Jami J, Barré-Sinoussi F, Weill JC. Expression of human CD4 in transgenic mice does not confer sensitivity to human immunodeficiency virus infection. AIDS Res Hum Retroviruses 1992; 8:2063-71. [PMID: 1493054 DOI: 10.1089/aid.1992.8.2063] [Citation(s) in RCA: 42] [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: 12/27/2022] Open
Abstract
Transfection of the human CD4 molecule into mouse cells does not confer susceptibility to human immunodeficiency virus type 1 (HIV-1) infection. Expression of the human CD4 molecule in transgenic mice was seen to offer some new possibilities. However, transgenic mouse T cells expressing either the human CD4 receptor, or a hybrid human/mouse CD4 receptor alone or in conjunction with human major histocompatibility complex class I molecules, were refractory to in vitro HIV-1 infection. In addition, no infection was observed after in vivo HIV inoculation to mice of these various transgenic lines. Injection of recombinant gp160 viral protein to the transgenic mice did not alter their T and B cell populations. The existence of a dominant block in mouse cells that prevents HIV entry is discussed.
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Affiliation(s)
- P Lorès
- Unité 257, Institut National de la Santé et de la Recherche Médicale, Institut Cochin de Génétique Moléculaire, Paris, France
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