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1.
Behav Res Methods ; 51(2): 532-555, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30334149

RESUMO

This paper introduces a new experimental protocol for studying mental representations of urban soundscapes through a simulation process. Subjects are asked to create a full soundscape by means of a dedicated software tool, coupled with a structured sound data set. This paradigm is used to characterize urban sound environment representations by analyzing the sound classes that were used to simulate the auditory scenes. A rating experiment of the soundscape pleasantness using a seven-point bipolar semantic scale is conducted to further refine the analysis of the simulated urban acoustic scenes. Results show that (1) a semantic characterization in terms of presence/absence of sound sources is an effective way to characterize urban soundscape pleasantness, and (2) acoustic pressure levels computed for specific sound sources better characterize the appraisal than the acoustic pressure level computed over the overall soundscape.


Assuntos
Acústica , Percepção Auditiva , Emoções , Humanos , Semântica , Som
2.
Ann Pharm Fr ; 74(6): 439-447, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-27162122

RESUMO

OBJECTIVES: We conducted a prospective study approved by the local ethics committee to determine the impact of a pharmaceutical intervention (PI) on pain, fatigue, quality of life (QoL) and coping strategies in patients with HMs starting chemotherapy sessions. MATERIAL AND METHODS: Patients received either usual care (UC)+PI (PI group) or UC alone (UC group). They had to complete 2 questionnaires, QLQ-C30 and MAC 21, at 3 different time points: before starting the 1st chemotherapy session (T1), during the intercure (T2) and the day before starting the 2nd chemotherapy session (T3). To determine predictive factors of pain, fatigue, QoL and coping scores at T3, a multivariate ANOVA was used. QoL and coping scores were analysed longitudinally using a linear mixed model. RESULTS: Sixty-eight patients were included in the PI (n=34) or UC groups (n=34). Ninety-two percent of the patients returned all the questionnaires. At inclusion, QoL was significantly better in the PI group (P=0.047). At T3, the group had no influence on pain, fatigue, nor coping scores but a trend towards a better QoL was observed in the PI group (P=0.090). Longitudinally, the PI group did not present significantly better scores on pain, fatigue but both a trend toward better Qol scores and lower anxious preoccupations scores. CONCLUSION: A PI at the beginning of chemotherapy sessions did not have any significant impact on pain and fatigue but a trend towards better Qol scores and lower anxious preoccupations scores.


Assuntos
Adaptação Psicológica , Antineoplásicos/efeitos adversos , Neoplasias Hematológicas/tratamento farmacológico , Neoplasias Hematológicas/psicologia , Qualidade de Vida , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Antineoplásicos/uso terapêutico , Feminino , Neoplasias Hematológicas/complicações , Humanos , Masculino , Pessoa de Meia-Idade , Fadiga Muscular/efeitos dos fármacos , Farmacêuticos , Estudos Prospectivos , Encaminhamento e Consulta , Inquéritos e Questionários , Adulto Jovem
3.
Ann Rheum Dis ; 74(5): 836-42, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-24395556

RESUMO

BACKGROUND: Gout therapy includes xanthine oxidase inhibitors (XOI) and colchicine, which have both been associated with decreased cardiovascular risk. However, their effects on major cardiac events, such as myocardial infarction (MI), need to be investigated further. OBJECTIVES: To investigate whether XOIs and colchicine are associated with decreased risk of MI. METHODS: This case-control study compared patients with first-ever MI and matched controls. Cases were recruited from the Pharmacoepidemiological General Research on MI registry. Controls were selected from a referent population (n=8444) from general practice settings. RESULTS: The study sample consisted of 2277 MI patients and 4849 matched controls. Use of allopurinol was reported by 3.1% of cases and 3.8 of controls, and 1.1% of cases and controls used colchicine. The adjusted OR (95% CI) for MI with allopurinol use was 0.80 (0.59 to 1.09). When using less stringent matching criteria that allowed for inclusion of 2593 cases and 5185 controls, the adjusted OR was 0.73 (0.54 to 0.99). Similar results were found on analysis by sex and hypertension status. Colchicine used was not associated with a decreased risk of MI (aOR=1.17 (0.70 to 1.93)). CONCLUSIONS: Allopurinol may be associated with a reduced risk of MI. No decreased risk of MI was found in colchicine users. Besides its urate-lowering property, allopurinol might have a cardioprotective effect.


Assuntos
Alopurinol/uso terapêutico , Colchicina/uso terapêutico , Supressores da Gota/uso terapêutico , Gota/tratamento farmacológico , Infarto do Miocárdio/epidemiologia , Idoso , Estudos de Casos e Controles , Feminino , Gota/epidemiologia , Humanos , Hipertensão/epidemiologia , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Fatores de Proteção
4.
J Intern Med ; 275(4): 398-408, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24206418

RESUMO

OBJECTIVES: The aim of this study was to investigate whether the quadrivalent human papillomavirus (HPV) vaccine Gardasil is associated with a change in the risk of autoimmune disorders (ADs) in young female subjects. DESIGN: Systematic case-control study of incident ADs associated with quadrivalent HPV vaccination in young women across France. PARTICIPANTS AND SETTING: A total of 113 specialised centres recruited (from December 2007 to April 2011) females aged 14-26 years with incident cases of six types of ADs: idiopathic thrombocytopenic purpura (ITP), central demyelination/multiple sclerosis (MS), Guillain-Barré syndrome, connective tissue disorders (systemic lupus erythematosus, rheumatoid arthritis/juvenile arthritis), type 1 diabetes mellitus and autoimmune thyroiditis. Control subjects matched to cases were recruited from general practice. ANALYSIS: Multivariate conditional logistic regression analysis; factors included age, geographical origin, smoking, alcohol consumption, use of oral contraceptive(s) or vaccine(s) other than Gardasil received within 24 months before the index date and personal/family history of ADs. RESULTS: Overall, 211 definite cases of ADs were matched to 875 controls. The adjusted odds ratio (OR) for any quadrivalent HPV vaccine use was 0.9 [95% confidence interval (CI) 0.5-1.5]. The individual ORs were 1.0 (95% CI 0.4-2.6) for ITP, 0.3 (95% CI 0.1-0.9) for MS, 0.8 (95% CI 0.3-2.4) for connective disorders and 1.2 (95% CI 0.4-3.6) for type 1 diabetes. No exposure to HPV vaccine was observed in cases with either Guillain-Barré syndrome or thyroiditis. CONCLUSIONS: No evidence of an increase in the risk of the studied ADs was observable following vaccination with Gardasil within the time periods studied. There was insufficient statistical power to allow conclusions to be drawn regarding individual ADs.


Assuntos
Doenças Autoimunes/imunologia , Vacinação em Massa , Infecções por Papillomavirus/prevenção & controle , Vacinas contra Papillomavirus/efeitos adversos , Adolescente , Adulto , Alphapapillomavirus , Doenças Autoimunes/epidemiologia , Doenças Autoimunes/etiologia , Estudos de Casos e Controles , Doenças do Tecido Conjuntivo/imunologia , Diabetes Mellitus Tipo 1/imunologia , Feminino , França/epidemiologia , Vacina Quadrivalente Recombinante contra HPV tipos 6, 11, 16, 18 , Humanos , Incidência , Vacinação em Massa/estatística & dados numéricos , Esclerose Múltipla/imunologia , Infecções por Papillomavirus/imunologia , Vacinas contra Papillomavirus/administração & dosagem , Púrpura Trombocitopênica Idiopática/imunologia , Fatores de Risco , Adulto Jovem
5.
Rev Neurol (Paris) ; 170(6-7): 407-15, 2014.
Artigo em Francês | MEDLINE | ID: mdl-24726041

RESUMO

Post-lumbar puncture headache (PLPH) is a well-known syndrome resulting from spinal fluid leakage and delayed closure of a dural defect. The main symptom of PLPH is headache in upright posture relieved by lying down. Outcome is usually benign and complications are uncommon. The functional impact can however be important, leading to delayed discharge, sick leave and, if information delivery is ineffective, iterative consultations. Preventive measures have been published, but the prevalence of PLPH remains high (15 to 40% after diagnostic lumbar puncture). Needle size and type are probably the most important factors for reducing the risk of PLPH. Recovery can be rapid, within a few days. If PLPH persists after four days, an epidural blood patch should be discussed. The objective of this review is to summarize the literature on PLPH, and share the experience of our emergency headache center with an atraumatic 25-gauge needle (pencan, 0.5×90mm or 0.5×103mm, Braun, Germany).


Assuntos
Serviços Médicos de Emergência/estatística & dados numéricos , Cefaleia Pós-Punção Dural , Placa de Sangue Epidural , Desenho de Equipamento , Humanos , Agulhas , Neuroimagem , Cefaleia Pós-Punção Dural/diagnóstico , Cefaleia Pós-Punção Dural/epidemiologia , Cefaleia Pós-Punção Dural/fisiopatologia , Cefaleia Pós-Punção Dural/prevenção & controle , Cefaleia Pós-Punção Dural/terapia , Postura , Prevalência , Estudos Retrospectivos , Fatores de Risco
6.
Parasite ; 19(2): 159-64, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-22550627

RESUMO

In this laboratory study, we investigated how the biological cycle of Anopheles gambiae s.s. (VKPR strain) would be like when grew in an environment containing more or less plant matter (2.5 or 5 g/l) and fertilizer (8-12-8 or 17-23-17 mg/l). Half of the environments studied were not exposed to insecticide (control) whereas the other half was submitted to deltamethrin treatment at the concentration of 0.015 mg/l. The bioassays showed that 2.5 g/l of plant matter in water are not sufficient to feed the hundred larvae, each breeding site contains. Treating these breeding sites with deltamethrin reversed the situation as it decreased the competition for food resources and allowed the surviving larvae to share the small amount of food enabling them to pursue their development until adults. If the introduction of NPK in untreated sites has not improved the nutritive qualities of the water, in the treated sites it multiplied the number of emerging adults by 2.5. In the waters containing 5 g/l of plant matter, the larvae did not undergo feeding competition and the impact of insecticide followed of a more traditional selection scheme that expressed itself by a lower number of emerging adults. In these environments treated or nontreated where plant matter is abundant, adding NPK brings food supplement to the larvae therefore increases the survival rate of An. gambiae. To conclude, whether in habitats with little or much plant matter, NPK presence in water results in larger adults with generally, more soluble proteins.


Assuntos
Anopheles/crescimento & desenvolvimento , Fertilizantes , Insetos Vetores/crescimento & desenvolvimento , Resistência a Inseticidas/efeitos dos fármacos , Inseticidas , Nitrilas , Piretrinas , Animais , Anopheles/efeitos dos fármacos , Peso Corporal , Feminino , Insetos Vetores/efeitos dos fármacos , Masculino , Nitrogênio , Fósforo , Poaceae , Dinâmica Populacional , Potássio
7.
Gynecol Obstet Fertil Senol ; 50(1): 2-25, 2022 01.
Artigo em Francês | MEDLINE | ID: mdl-34781016

RESUMO

OBJECTIVE: To provide national guidelines for the management of women with severe preeclampsia. DESIGN: A consensus committee of 26 experts was formed. A formal conflict of interest (COI) policy was developed at the onset of the process and enforced throughout. The entire guidelines process was conducted independently of any industrial funding. The authors were advised to follow the principles of the Grading of Recommendations Assessment, Development and Evaluation (GRADE®) system to guide assessment of quality of evidence. The potential drawbacks of making strong recommendations in the presence of low-quality evidence were emphasized. METHODS: The last SFAR and CNGOF guidelines on the management of women with severe preeclampsia was published in 2009. The literature is now sufficient for an update. The aim of this expert panel guidelines is to evaluate the impact of different aspects of the management of women with severe preeclampsia on maternal and neonatal morbidities separately. The experts studied questions within 7 domains. Each question was formulated according to the PICO (Patients Intervention Comparison Outcome) model and the evidence profiles were produced. An extensive literature review and recommendations were carried out and analyzed according to the GRADE® methodology. RESULTS: The SFAR/CNGOF experts panel provided 25 recommendations: 8 have a high level of evidence (GRADE 1±), 9 have a moderate level of evidence (GRADE 2±), and for 7 recommendations, the GRADE method could not be applied, resulting in expert opinions. No recommendation was provided for 3 questions. After one scoring round, strong agreement was reached between the experts for all the recommendations. CONCLUSIONS: There was strong agreement among experts who made 25 recommendations to improve practices for the management of women with severe preeclampsia.


Assuntos
Anestesiologia , Médicos , Pré-Eclâmpsia , Consenso , Cuidados Críticos , Feminino , Humanos , Recém-Nascido , Pré-Eclâmpsia/terapia , Gravidez
8.
Gynecol Obstet Fertil Senol ; 49(1): 73-78, 2021 01.
Artigo em Francês | MEDLINE | ID: mdl-33161190

RESUMO

Between 2013 and 2015, 20 maternal deaths were associated with stroke. Stroke was the main cause of death in 16 cases (12 hemorrhagic strokes [75%], 1 ischemic stroke and three cerebral thrombophlebitis). In the four other cases, the stroke was a complication of another pathology. The 16 deaths directly related to stroke account for 5.7% of all maternal deaths (maternal mortality ratio of 0.7/100,000 live births vs. 0.9/100,000 over the period 2010-2012, NS). Stroke occurred during pregnancy in 8 cases (50%). Three patients died without giving birth and the 5 others gave birth by emergency caesarean section. In the remaining eight cases (50%), stroke occurred between day 0 and day 54 during the post-partum period. The mean age was 35.5 years, with 9 women being more than 35 years old (56%). One or more factors of sub-optimal care were present in 28% of the cases, and 8% of deaths were considered possibly or probably preventable. The last four strokes were associated with another pathology (eclampsia [n=2], hepatic cirrhosis [n=1], possible complication of spinal anesthesia [n=1]).


Assuntos
Morte Materna , Acidente Vascular Cerebral , Adulto , Cesárea , Feminino , França/epidemiologia , Humanos , Morte Materna/etiologia , Mortalidade Materna , Gravidez
9.
Gynecol Obstet Fertil Senol ; 49(1): 83-88, 2021 01.
Artigo em Francês | MEDLINE | ID: mdl-33161193

RESUMO

Maternal deaths from indirect obstetric causes are the result of a pre-existing disease or condition that appeared during pregnancy without obstetric causes, but which was aggravated by the physiological effects of pregnancy. Twenty-six deaths from indirect causes related to a pre-existing pathology, excluding disease of the circulatory system or infection, were analysed by the committee of experts. Pre-existing pathology during pregnancy was documented in 13 women (asthma, n=3, genetic diseases, n=3, previous breast cancer, n=2, major sickle cell syndrome, n=2, epilepsy, n=1 and brain tumour, n=1). In 13 women, the pathology was not known before pregnancy (breast cancer, n=6, brain tumours, n=3, uterine sarcoma, n=1, cervical cancer, n=1, malignant melanoma, n=1 and acute myeloid leukaemia, n=1). For 16 women (61%), the death is related to a neoplastic pathology. Although the majority were considered inevitable for 11/16 women, 5 deaths were considered possibly preventable, the main preventable factor being a delay in diagnosis, and/or a delay in starting a specific treatment. For 10 women, the death is related to a chronic non-neoplastic pathology, known before pregnancy for 9 women, judged most often as possibly preventable, the main preventable factor being the failure of the medical team or the patient to take the pathology and/or its treatment into account. A preconception medical consultation with a specialist should be recommended to all patients with pre-existing disease. A clinical examination of the breasts is strongly recommended at the first visit and then during pregnancy.


Assuntos
Doenças Cardiovasculares , Morte Materna , Acidente Vascular Cerebral , Doenças Cardiovasculares/epidemiologia , Feminino , França/epidemiologia , Humanos , Morte Materna/etiologia , Mortalidade Materna , Gravidez , Acidente Vascular Cerebral/epidemiologia
10.
Gynecol Obstet Fertil Senol ; 49(1): 67-72, 2021 01.
Artigo em Francês | MEDLINE | ID: mdl-33197653

RESUMO

Pregnancy and postpartum represent periods at very high risk of venous thromboembolism disease which appears to extend well beyond the classic 6-8 weeks after childbirth. Pulmonary embolism (PE) is still one of the three leading causes of direct maternal death (MM) in most developed countries. Between 2013 and 2015, 23 maternal deaths were caused by a venous thromboembolic complication (VTE) (20 pulmonary embolism and 3 cerebral thrombophlebitis), representing 8.8 % of maternal deaths and a Maternal Mortality Ratio of 1.0 per 100,000 live births (95 % CI 0.6-1, 4) which is stable over the last 10 years. Regarding the timing of death, 1 death occurred after abortion, 35 % (8/23) during an ongoing pregnancy (including four before 22 WG), and 61 % (14/23) after childbirth. Among the 23 deaths from VTE, 17 % (5/23) occurred outside a healthcare center (home, street). The mean age was 32.3 and 7 women (30 %) were≥35 years old. Six patients were obese (27 %). The preventability rate is 34.8 % (compared to 50 % in 2007-2009 and 2010-2012), The preventability factors involve the inadequacy of care in 34.8 % of cases (8/23), organizational factors in one case (1/23) and a lack of interaction of the patient with the health care system in two cases (2/23). Care was considered non-optimal in 59 % of these deaths. This proportion is higher than the preventability rate because suboptimal care sometimes did not influence the final outcome.


Assuntos
Morte Materna , Embolia Pulmonar , Tromboembolia Venosa , Adulto , Feminino , Humanos , Morte Materna/etiologia , Mortalidade Materna , Gravidez , Fatores de Risco , Tromboembolia Venosa/epidemiologia
11.
Gynecol Obstet Fertil Senol ; 49(1): 38-46, 2021 01.
Artigo em Francês | MEDLINE | ID: mdl-33161187

RESUMO

Pregnancy represents a period of significant psychological vulnerability for women. During the perinatal period, twenty percent of them would present with mental disorders ranging from anxiety to depression. In those with pre-existing mental illness, the risk of acute decompensation is significant. For this reason, the World Health Organization recommends classifying suicides occurring during pregnancy and up to one-year post-partum as maternal deaths. Thus, between 2013 and 2015, 35 maternal suicides occurred in France, representing a maternal mortality ratio of 1:4 per 100,000 live births (95% CI: 1.0-2.0). By constituting 13.4% of all maternal deaths for the period, this group is the one of the 2 leading causes of maternal mortality. A total of 23% occurred in the first 42 days post-partum, and 77% between 43 days and one year after birth. 33.3% of the suicidal mothers had a known psychiatric history and 30.3% had a history of psychiatric care, unknown to obstetrical teams. Non-optimal care was present in 72% of cases with 91 % of suicides were potentially preventable, preventability factors beinga lack of multidisciplinary care and inadequate interaction between the patient and the care system. Strong messages were drawn from the analysis of these cases to optimize care: improve knowledge of the psychiatric history from the time of enrolment in maternity units, improve the identification of warning symptoms and the use of the psychologist and/or psychiatrist, set up a specific care pathway and multidisciplinary collaboration in case of known psychiatric disease.


Assuntos
Morte Materna , Suicídio , Feminino , França/epidemiologia , Humanos , Morte Materna/etiologia , Mortalidade Materna , Período Pós-Parto , Gravidez
12.
Sci Rep ; 10(1): 9947, 2020 06 19.
Artigo em Inglês | MEDLINE | ID: mdl-32561776

RESUMO

Tsetse flies (Diptera: Glossinidae) are the main vectors of animal and human trypanosomoses in Africa. The Sterile Insect Technique (SIT) has proven effective in controlling tsetse flies when applied to isolated populations but necessitates the production of large numbers of sterile males. A new approach, called boosted SIT, combining SIT with the contamination of wild females by sterile males coated with biocides has been proposed for large-scale control of vector populations. The aim of the study was to evaluate this new approach using pyriproxyfen on the riverine species Glossina palpalis gambiensis (Vanderplank, 1949) in the laboratory. The contamination dose and persistence of pyriproxyfen on sterile males, the impact of pyriproxyfen on male survival, and the dynamics of pyriproxyfen transfer from a sterile male to a female during mating, as well as the impact of pyriproxyfen on pupal production and adult emergence, were evaluated in the laboratory. For this purpose, a method of treatment by impregnating sterile males with a powder containing 40% pyriproxyfen has been developed. The results showed that the pyriproxyfen has no impact on the survival of sterile males. Pyriproxyfen persisted on sterile males for up to 10 days at a dose of 100 ng per fly. In addition, the horizontal transfer of pyriproxyfen from a treated sterile male to a female during mating could be measured with an average of 50 ng of pyriproxyfen transferred. After contacts without mating, the average quantity transferred was more than 10 ng. Finally, the pyriproxyfen powder was very effective on G. p. gambiensis leading to 0% emergence of the pupae produced by contaminated females. These promising results must be confirmed in the field. A large-scale assessment of this boosted pyriproxyfen-based SIT approach will be carried out against tsetse flies in Senegal (West Africa).


Assuntos
Controle de Insetos/métodos , Insetos Vetores/efeitos dos fármacos , Inseticidas/toxicidade , Piridinas/toxicidade , Moscas Tsé-Tsé/efeitos dos fármacos , Animais , Feminino , Infertilidade Masculina/genética , Insetos Vetores/fisiologia , Insetos Vetores/efeitos da radiação , Inseticidas/farmacologia , Masculino , Piridinas/farmacologia , Radiação Ionizante , Reprodução , Moscas Tsé-Tsé/fisiologia , Moscas Tsé-Tsé/efeitos da radiação
13.
J Cell Biol ; 85(2): 213-27, 1980 May.
Artigo em Inglês | MEDLINE | ID: mdl-7372705

RESUMO

Previous studies on exocytosis in Paramecium using mutants affecting trichocyst extrusion permitted us to analyze the assembly and function of three intramembrane particle arrays ("ring" and "rosette" in the plasma membrane, "annulus" in the trichocyst membrane) involved in the interaction between these two membranes. Using a conditional mutation, nd9, which blocks rosette assembly and prevents exocytosis at the nonpermissive temperature, we have analyzed the effect of temperature on the secretory capacity of nd9 cells. By combining several techniques (physiological studies, microinjections, inhibition of fatty acid synthesis, and freeze-fracture analysis) we demonstrate (a) that the product of the mutated allele nd9 is not thermolabile but that its activity is dependent upon temperature-induced changes in the membrane lipid composition and (b) that the product of the nd9 locus is a diffusible cytoplasmic component whose interaction with both plasma membrane and trichocyst membrane is required for rosette assembly and exocytosis. The data provide physiological evidence for the existence of a molecular complex(es) linking the two membranes and involved in the control of membrane fusion; we discuss the possible nature and function of these links.


Assuntos
Exocitose/efeitos dos fármacos , Paramecium/fisiologia , Animais , Membrana Celular/fisiologia , Membrana Celular/ultraestrutura , Cerulenina/farmacologia , Conjugação Genética , Citoplasma/fisiologia , Microinjeções , Mutação , Paramecium/genética , Paramecium/ultraestrutura , Temperatura
14.
J Cell Biol ; 88(2): 301-11, 1981 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-7204496

RESUMO

The trichocysts of Paramecium tetraurelia constitute a favorable system for studying secretory process because of the numerous available mutations that block, at various stages, the development of these secretory vesicles, their migration towards and interaction with the cell surface, and their exocytosis. Previous studies of several mutants provided information (a) on the assembly and function of the intramembranous particles arrays in the plasma membrane at trichocyst attachment sites, (b) on the autonomous motility of trichocysts, required for attachment to the cortex, and (c) on a diffusible cytoplasmic factor whose interaction with both trichocyst and plasma membrane is required for exocytosis to take place. We describe here the properties of four more mutants deficient in exocytosis ability, nd6, nd7, tam38, and tam6, which were analyzed by freeze-fracture, microinjection of trichocysts, and assay for repair of the mutational defect through cell-cell interaction during conjugation with wild-type cells. As well as providing confirmation of previous conclusions, our observations show that the mutations nd6 and tam6 (which display striking abnormalities in their plasma membrane particle arrays and are reparable through cell-cell contact but not by microinjection of cytoplasm) affect two distinct properties of the plasma membrane, whereas the other two mutations affect different properties of the trichocysts. Altogether, the mutants so far analyzed now provide a rather comprehensive view of the steps and functions involved in secretory processes in Paramecium and demonstrate that two steps of these processes, trichocyst attachment to the plasma membrane and exocytosis, depend upon specific properties of both the secretory vesicle and the plasma membrane.


Assuntos
Exocitose , Paramecium/fisiologia , Animais , Membrana Celular/fisiologia , Conjugação Genética , Técnica de Fratura por Congelamento , Microinjeções , Mutação , Organoides/fisiologia , Paramecium/genética , Paramecium/ultraestrutura
15.
J Cell Biol ; 69(1): 126-43, 1976 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-1254639

RESUMO

Using a series of mutants of Paramecium tetraurelia, we demonstrate, for the first time, changes in the internal structure of the cell membrane, as revealed by freeze-fracture, that correspond to specific single gene mutations. On the plasma membrane of Paramecium circular arrays of particles mark the sites of attachment of the tips of the intracellular secretory organelles-trichocysts. In wild-type paramecia, where attached trichocysts can be expelled by exocytosis under various stimuli, the plasma membrane array is composed of a double outer ring of particles (300 nm in diameter) and inside the ring a central rosette (fusion rosette) of particles (76 nm in diameter). Mutant nd9, characterized by a thermosensitive ability to discharge trichocysts, shows the same organization in cells grown at the permissive temperature (18 degrees C), while in cells grown at the nonpermissive temperature (27 degrees C) the rosette is missing. In mutant tam 8, characterized by normal but unattached trichocysts, and in mutant tl, completely devoid of trichocysts, no rosette is formed and the outer rings always show a modified configuration called "parentheses", also found in wild-type and in nd9 (18 degrees C) cells. From this comparison between wild type and mutants, we conclude: (a) that the formation of parentheses is a primary differentiation of the plasma membrane, independent of the presence of trichocysts, while the secondary transformation of parentheses into circular arrays and the formation of the rosette are triggered by interaction between trichocysts and plasma membranes; and (b) that the formation of the rosette is a prerequisite for trichocyst exocytosis.


Assuntos
Genes , Paramecium/ultraestrutura , Animais , Diferenciação Celular , Membrana Celular/ultraestrutura , Técnica de Fratura por Congelamento , Mutação , Organoides/ultraestrutura , Paramecium/fisiologia , Temperatura
16.
Sci Rep ; 9(1): 20345, 2019 12 30.
Artigo em Inglês | MEDLINE | ID: mdl-31889100

RESUMO

The concept of milk as a healthy food has opened the way for studies on milk components, from nutrients to microRNAs, molecules with broad regulatory properties present in large quantities in milk. Characterization of these components has been performed in several species, such as humans and bovine, depending on the stages of lactation. Here, we have studied the variation in milk microRNA composition according to genetic background. Using high throughput sequencing, we have characterized and compared the milk miRNomes of Holstein and Normande cattle, dairy breeds with distinct milk production features, in order to highlight microRNAs that are essential for regulation of the lactation process. In Holstein and Normande milk, 2,038 and 2,030 microRNAs were identified, respectively, with 1,771 common microRNAs, of which 1,049 were annotated and 722 were predicted. The comparison of the milk miRNomes of two breeds allowed to highlight 182 microRNAs displaying significant differences in the abundance. They are involved in the regulation of lipid metabolism and mammary morphogenesis and development, which affects lactation. Our results provide new insights into the regulation of molecular mechanisms involved in milk production.


Assuntos
MicroRNAs , Leite , Transcriptoma , Fatores Etários , Animais , Cruzamento , Bovinos , Biologia Computacional/métodos , Patrimônio Genético , Sequenciamento de Nucleotídeos em Larga Escala , Leite/metabolismo , Especificidade da Espécie
17.
Neurophysiol Clin ; 38(5): 267-75, 2008 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-18940614

RESUMO

AIMS: Controversy remains about the existence and the nature of a specific bias in emotional facial expression processing in mixed anxious-depressed state (MAD). MATERIAL AND METHODS: Event-related potentials were recorded in the following three types of groups defined by the Spielberger state and trait anxiety inventory (STAI) and the Beck depression inventory (BDI): a group of anxious participants (n=12), a group of participants with depressive and anxious tendencies (n=12), and a control group (n=12). Participants were confronted with a visual oddball task in which they had to detect, as quickly as possible, deviant faces amongst a train of standard neutral faces. Deviant stimuli changed either on identity, or on emotion (happy or sad expression). RESULTS: Anxiety facilitated emotional processing and the two anxious groups produced quicker responses than control participants; these effects were correlated with an earlier decisional wave (P3b) for anxious participants. Mixed anxious-depressed participants showed enhanced visual processing of deviant stimuli and produced higher amplitude in attentional complex (N2b/P3a), both for identity and emotional trials. P3a was also particularly increased for emotional faces in this group. CONCLUSION: Anxious state mainly influenced later decision processes (shorter latency of P3b), whereas mixed anxious-depressed state acted on earlier steps of emotional processing (enhanced N2b/P3a complex). Mixed anxious-depressed individuals seemed more reactive to any visual change, particularly emotional change, without displaying any valence bias.


Assuntos
Ansiedade/psicologia , Transtorno Depressivo/psicologia , Potenciais Evocados/fisiologia , Emoções Manifestas/fisiologia , Expressão Facial , Percepção Visual/fisiologia , Atenção/fisiologia , Comportamento/fisiologia , Interpretação Estatística de Dados , Eletroencefalografia , Feminino , Humanos , Testes Neuropsicológicos , Estimulação Luminosa , Escalas de Graduação Psiquiátrica , Desempenho Psicomotor/fisiologia , Adulto Jovem
18.
Anim Genet ; 38(6): 601-8, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17931403

RESUMO

The European sea bass, Dicentrarchus labrax L., tolerates a range of salinities from freshwater to hyper-saline. To study differences in protein expression, fish were reared in both freshwater and seawater. After 3-month acclimation, gill and intestine epithelia were collected and the soluble protein extracted. In all, 362 spots were differentially expressed in the gills and intestines of fishes reared in seawater compared to those from freshwater. Fifty differential protein spots were excised from a colloidal Coomassie-stained gel. Nine separate protein spots were identified unambiguously by mass spectrometry and database searching. Among the six proteins over-expressed in gill cells in seawater, five were cytoskeleton proteins and one was the aromatase cytochrome P450. In gill cells under freshwater conditions, the two over-expressed proteins identified were the prolactin receptor and the major histocompatibility complex class II beta-antigen. In intestinal cells under freshwater conditions, the Iroquois homeobox protein Ziro5 was upregulated over ninefold. The expression of these proteins, their possible direct or indirect roles in the adaptation of D. labrax to salinity, and their correspondences with a previous study are discussed.


Assuntos
Bass/metabolismo , Proteínas de Peixes/metabolismo , Água Doce/química , Proteoma , Água do Mar/química , Cloreto de Sódio/análise , Aclimatação , Animais , Aromatase/metabolismo , Eletroforese em Gel Bidimensional , Feminino , Proteínas de Peixes/química , Brânquias/metabolismo , Mucosa Intestinal/metabolismo , Masculino , Espectrometria de Massas , RNA Mensageiro/metabolismo , Receptores da Prolactina/metabolismo
19.
Gynecol Obstet Fertil Senol ; 45(12S): S65-S70, 2017 Dec.
Artigo em Francês | MEDLINE | ID: mdl-29153848

RESUMO

Stroke is a rare event during pregnancy (10/100,000) and can be ischemic (24%), hemorrhagic (74%) or both (2%). Pregnancy probably increases the risk even if it is discussed for arteriovenous malformation (AVM), aneurismal subarachnoid hemorrhage (SAH) and cavernomas. Between 2010 and 2012, 31 maternal deaths were associated with stroke. In 22 cases, stroke was the direct cause of death giving a maternal mortality ratio of 0,9/100,000 witch is not different from the former report (2007-2009). There were 2 cerebral thrombophlebitis, 2 ischemic strokes and 18 hemorrhagic strokes (4 SAH, 2 AVM). These deaths occurred during ongoing pregnancy in 5 cases (25%), after miscarriage in 1 case (5%) and in the post-partum period in 14 cases (70%). In this last situation, stroke occurred before delivery in 4 cases and during the post-partum period in 9 cases (1 to 9 days) (1 unknown). There were 7 vaginal deliveries (50%) and 6 emergency cesarean sections (43%) (1 unknown). Most of those deaths were considered to be unavoidable (13/17, 76%). Four deaths were considered by the experts as being possibly avoidable (delay diagnosis, diagnostic error, inadequate treatment, lake of interruption of the pregnancy). Analyzing those deaths remind that any sudden, severe and unusual headache must be explored and that pregnancy does not contraindicate any of the diagnostic examinations (TDM, angio-TDM, MRI) or invasive treatments (surgery, arterio-embolization, fibrinolysis) necessary for its management. Furthermore, the diagnosis of postdural puncture headache should not be establishedwithout imaging when the symptomatology is not absolutely typical.


Assuntos
Morte Materna/etiologia , Complicações Cardiovasculares na Gravidez/mortalidade , Acidente Vascular Cerebral/mortalidade , Adulto , Cesárea , Parto Obstétrico , Feminino , França/epidemiologia , Humanos , Morte Materna/prevenção & controle , Mortalidade Materna , Período Pós-Parto , Gravidez , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/terapia
20.
Gynecol Obstet Fertil Senol ; 45(12S): S31-S37, 2017 Dec.
Artigo em Francês | MEDLINE | ID: mdl-29169973

RESUMO

Pregnancy and postpartum are very high-risk periods for venous thromboembolism events (TEE), which seems to extend far beyond the classical 6-8 weeks after childbirth. Pulmonary embolism (PE) is one of the 3 main causes of direct maternal death in western countries. Between 2010 an 2012 in France, 24 deaths were related to PE giving a maternal mortality ratio of 1/100,000, which is not different from the former report (2007-2009). PE is responsible of 9% of maternal deaths, in equal position with postpartum hemorrhage and amniotic fluid embolism. Four deaths (16%) occurred after pregnancy interruption (1 abortion, 3 medical interruptions), 7 (30%) during ongoing pregnancy (before 22 weeks of pregnancy) and 13 (54%) in the postpartum period (9 to 60 days after childbirth). Among these deaths, 9 occurred in extra hospital setting (at home or in the street). Fifty percent of these deaths seem to be avoidable, as it was in the former report. Main avoidability criteria were: diagnostic delay; mobilization before effective anticoagulation of proximal deep venous thrombosis; insufficient preventive treatment with low molecular weight heparin [duration and/or dose (obesity)]; unjustified induction of labor. Analyzing those deaths allow to remind that in case of high suspicion of TEE, effective anticoagulation should be started without delay, and that angio-TDM is not contraindicated in pregnant women. Low molecular weight heparin regiment should be adapted to real weight. Monitoring of anti-Xa activity, if not routinely recommended, is probably useful in case of obesity or renal insufficiency. Anticipating birth by induction of labor, in the absence of abnormal fetal heart rhythm, should not delay effective anticoagulation of near-term TEE.


Assuntos
Morte Materna/etiologia , Complicações Cardiovasculares na Gravidez , Tromboembolia Venosa/complicações , Adulto , Anticoagulantes/uso terapêutico , Embolia Amniótica/epidemiologia , Feminino , França/epidemiologia , Heparina de Baixo Peso Molecular/uso terapêutico , Humanos , Mortalidade Materna , Hemorragia Pós-Parto/epidemiologia , Período Pós-Parto , Gravidez , Fatores de Risco , Tromboembolia Venosa/prevenção & controle
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