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Dynamic mechanisms for membrane skeleton transitions. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.29.591779. [PMID: 38746295 PMCID: PMC11092671 DOI: 10.1101/2024.04.29.591779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
The plasma membrane and the underlying skeleton form a protective barrier for eukaryotic cells. The molecules forming this complex composite material constantly rearrange under mechanical stress to confer this protective capacity. One of those molecules, spectrin, is ubiquitous in the membrane skeleton and primarily located proximal to the inner leaflet of the plasma membrane and engages in protein-lipid interactions via a set of membrane-anchoring domains. Spectrin is linked by short actin filaments and its conformation varies in different types of cells. In this work, we developed a generalized network model for the membrane skeleton integrated with myosin contractility and membrane mechanics to investigate the response of the spectrin meshwork to mechanical loading. We observed that the force generated by membrane bending is important to maintain a smooth skeletal structure. This suggests that the membrane is not just supported by the skeleton, but has an active contribution to the stability of the cell structure. We found that spectrin and myosin turnover are necessary for the transition between stress and rest states in the skeleton. Our model reveals that the actin-spectrin meshwork dynamics are balanced by the membrane forces with area constraint and volume restriction promoting the stability of the membrane skeleton. Furthermore, we showed that cell attachment to the substrate promotes shape stabilization. Thus, our proposed model gives insight into the shared mechanisms of the membrane skeleton associated with myosin and membrane that can be tested in different types of cells. Significance Statement Spectrin was first observed in red blood cells, as a result of which, many theoretical models focused on understanding its function in this cell type. However, recently, experiments have shown that spectrin is an important skeletal component for many different cell types and that it can form different configurations with actin. In this work, we proposed a model to study the shared mechanisms behind the function of the actin-spectrin meshwork in different types of cells. We found that membrane dynamics in addition to spectrin and myosin turnover are necessary to achieve conformational changes when stresses are applied and to guarantee shape stability when the stresses are removed. We observed that membrane bending is important to support skeletal structure. Furthermore, our model gives insight into how cell shape is maintained despite constant spectrin turnover and myosin contraction.
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Pediatric Cardiology Fellowship Standards for Training in Exercise Medicine and Curriculum Outline. Pediatr Cardiol 2023; 44:540-548. [PMID: 36422652 DOI: 10.1007/s00246-022-03048-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 11/04/2022] [Indexed: 11/25/2022]
Abstract
Over the past 2 decades, fundamentals of exercise medicine, including clinical exercise testing, assessment and promotion of physical activity, exercise prescription, and supervised exercise training/rehabilitation programming have demonstrated considerable clinical value in the management of children and adolescents with congenital and acquired heart disease. Although the principles of exercise medicine have become an integral component in pediatric cardiology, there are no standardized training recommendations for exercise physiology during pediatric cardiology fellowship at this time. Thus, the Pediatric Cardiology Exercise Medicine Curriculum Committee (PCEMCC) was formed to establish core and advanced exercise physiology training recommendations for pediatric cardiology trainees. The PCEMCC includes a diverse group of pediatric cardiologists, exercise physiologists, and fellowship program directors. The expert consensus training recommendations are by no means a mandate and are summarized herein, including suggestions for achieving the minimum knowledge and training needed for general pediatric cardiology practice.
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Antipsychotic prescribing practices in real-life (APPREAL study): Findings from the French National Healthcare System Database (2007-2017). Front Psychiatry 2022; 13:1021780. [PMID: 36387010 PMCID: PMC9659890 DOI: 10.3389/fpsyt.2022.1021780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/13/2022] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Antipsychotics are used in a large variety of psychiatric and neurological disorders; investigating their use in real life is important to understand national prescribing practices, as well as to determine the levels of patient adherence. METHODS Using a 1/97e random sample (General Sample of Beneficiaries, EGB) of the French health insurance reimbursement database, we conducted a historical cohort study on the 2007-2017 period. The aim was to describe the sociodemographic characteristics of patients, the types of antipsychotics dispensed, the types of prescribers, the mean doses and average durations of treatment, the co-dispensed medications, and the levels of adherence to treatment. To exclude punctual uses of antipsychotics, we selected only patients with a continuous dispensing of the same antipsychotic over at least 3 months. RESULTS In total, 13,799 subjects (1.66% of the EGB sample) were included (56.0% females; mean age 55.8 ± 19.4 years). Risperidone (19.3%), cyamemazine (18.7%), olanzapine (11.9%), tiapride (8.8%), and haloperidol (7.5%) were the five most prescribed antipsychotics. 44.9% of prescriptions were written by general practitioners, 34.1% by hospital practitioners, and 18.4% by private-practice psychiatrists. On average, the mean dispensed doses were relatively low, but the variation range was large. Long-acting forms were used in 5.4% of the sample, and clozapine in 1.3%. 34.2% of patients received more than one antipsychotic, and almost 15% were prescribed at least three concomitant antipsychotics. Paliperidone and clozapine were associated with the highest levels of adherence, and risperidone and haloperidol with the lowest ones. CONCLUSION An important heterogeneity of antipsychotic prescribing practices was observed in France. The rate of use of long-acting antipsychotics was low, whereas multiple antipsychotic prescriptions were frequent.
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CAR‐T CELL THERAPY IN PRIMARY CENTRAL NERVOUS SYSTEM LYMPHOMA (PCNSL): THE EXPERIENCE OF THE FRENCH NETWORK FOR OCULO‐CEREBRAL LYMPHOMAS (LOC). Hematol Oncol 2021. [DOI: 10.1002/hon.74_2880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Patterns and drivers of genetic diversity and structure in the biological control parasitoid Habrobracon hebetor in Niger. BULLETIN OF ENTOMOLOGICAL RESEARCH 2019; 109:794-811. [PMID: 30968790 DOI: 10.1017/s0007485319000142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
When a promising natural enemy of a key pest exists locally, it is a common practice in biological control (BC) to rear and release it for supplementary control in the targeted agroecosystem even though significant knowledge gaps concerning pre/post release may still exist. Incorporating genetic information into BC research fills some of these gaps. Habrobracon hebetor, a parasitoid of many economically important moths that infest stored and field crops worldwide is commonly used, particularly against the millet head miner (MHM), a key pest of millet in Sahelian countries. To advance our knowledge on how H. hebetor that occurs naturally in open-field cropping systems and grain stores as well as being mass-produced and released for MHM control, performs in millet agroecosystems in Niger we evaluated its population genetics using two mitochondrial and 21 microsatellite markers. The field samples were genetically more diverse and displayed heterozygote excess. Very few field samples had faced significant recent demographic bottlenecks. The mating system (i.e. nonrandom mating with complementary sex determination) of this species may be the major driver of these findings rather than bottlenecks caused by the small number of individuals released and the scarcity of hosts during the longlasting dry season in Niger. H. hebetor population structure was represented by several small patches and genetically distinct individuals. Gene flow occurred at local and regional scales through human-mediated and natural short-distance dispersal. These findings highlight the importance of the mating system in the genetic diversity and structure of H. hebetor populations, and contribute to our understanding of its reported efficacy against MHM in pearl millet fields.
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Evolution of Magnetic Order from the Localized to the Itinerant Limit. PHYSICAL REVIEW LETTERS 2019; 123:097201. [PMID: 31524473 DOI: 10.1103/physrevlett.123.097201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Indexed: 06/10/2023]
Abstract
Quantum materials that feature magnetic long-range order often reveal complex phase diagrams when localized electrons become mobile. In many materials magnetism is rapidly suppressed as electronic charges dissolve into the conduction band. In materials where magnetism persists, it is unclear how the magnetic properties are affected. Here we study the evolution of the magnetic structure in Nd_{1-x}Ce_{x}CoIn_{5} from the localized to the highly itinerant limit. We observe two magnetic ground states inside a heavy-fermion phase that are detached from unconventional superconductivity. The presence of two different magnetic phases provides evidence that increasing charge delocalization affects the magnetic interactions via anisotropic band hybridization.
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SHOULD I WORRY ABOUT THIS ABNORMAL CARDIAC TEST RESULT? INSIGHTS INTO CARDIAC TEST REPORTING FROM QUALITATIVE ANALYSIS OF A CARDIOLOGY ECONSULT SERVICE. Can J Cardiol 2017. [DOI: 10.1016/j.cjca.2017.07.162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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USING ECONSULTATIONS TO DETERMINE WHAT PROMPTS CARDIOLOGY CONSULTATIONS AMONG PRIMARY CARE PROVIDERS: THE IMPORTANCE OF MULTIPLE CO-MORBIDITIES. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Pan-cancer analysis of mutation hotspots in protein domains. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)61060-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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SIMulation of Medication Error induced by Clinical Trial drug labeling: the SIMME-CT study. Int J Qual Health Care 2016; 28:311-5. [PMID: 26976831 DOI: 10.1093/intqhc/mzw025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2016] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To assess the impact of investigational drug labels on the risk of medication error in drug dispensing. DESIGN A simulation-based learning program focusing on investigational drug dispensing was conducted. SETTING The study was undertaken in an Investigational Drugs Dispensing Unit of a University Hospital of Lyon, France. PARTICIPANTS Sixty-three pharmacy workers (pharmacists, residents, technicians or students) were enrolled. INTERVENTION Ten risk factors were selected concerning label information or the risk of confusion with another clinical trial. Each risk factor was scored independently out of 5: the higher the score, the greater the risk of error. From 400 labels analyzed, two groups were selected for the dispensing simulation: 27 labels with high risk (score ≥3) and 27 with low risk (score ≤2). Each question in the learning program was displayed as a simulated clinical trial prescription. MAIN OUTCOME MEASURE Medication error was defined as at least one erroneous answer (i.e. error in drug dispensing). For each question, response times were collected. RESULTS High-risk investigational drug labels correlated with medication error and slower response time. Error rates were significantly 5.5-fold higher for high-risk series. Error frequency was not significantly affected by occupational category or experience in clinical trials. CONCLUSIONS SIMME-CT is the first simulation-based learning tool to focus on investigational drug labels as a risk factor for medication error. SIMME-CT was also used as a training tool for staff involved in clinical research, to develop medication error risk awareness and to validate competence in continuing medical education.
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USING ECONSULTS TO INFORM CARDIOLOGY CONTINUING MEDICAL EDUCATION NEEDS OF PRIMARY CARE PROVIDERS. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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IS RIGHT HEART FUNCTION ADVERSELY AFFECTED IN BREAST CANCER PATIENTS UNDERGOING ANTHRACYCLINE-BASED CHEMOTHERAPY? Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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EPICC study: evaluation of pharmaceutical intervention in cancer care. J Clin Pharm Ther 2015; 40:196-203. [DOI: 10.1111/jcpt.12242] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 12/18/2014] [Indexed: 11/30/2022]
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SIMMEON-Prep study: SIMulation of Medication Errors in ONcology: prevention of antineoplastic preparation errors. J Clin Pharm Ther 2014; 40:55-62. [DOI: 10.1111/jcpt.12225] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 09/24/2014] [Indexed: 11/29/2022]
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Improving cancer patient care with combined medication error reviews and morbidity and mortality conferences. Chemotherapy 2014; 59:330-7. [PMID: 24801809 DOI: 10.1159/000358190] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 12/22/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND To reduce the occurrence of medication errors, a systemic approach was developed combining anti-neoplastic medication error reviews and morbidity and mortality conferences (M&MCs). We report the first experience of implementing this strategy in oncology. METHODS The case reports submitted to combined reviews were prepared by physicians and pharmacists, and medication error(s) were described and chronological and root-cause analyses were performed. RESULTS Ten combined reviews were conducted, which involved the departments of haematology, medical oncology, pneumology, gastroenterology and clinical oncology pharmacy. A total of 91 errors were analysed, of which 3 had reached the patient. Thirty-four corrective actions were proposed; 53% consisted of changes in practice, 35% in procedural reminders and 12% in on-ward education sessions. CONCLUSIONS The combination of medication error reviews and M&MCs appears to be an efficient means of improving cancer patient safety and personnel proficiency. This multidisciplinary work is indispensable to improve future patient management through the critical analysis of past medical errors.
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Administration of Anticancer Drugs: Exposure in Hospital Nurses. Clin Ther 2014; 36:401-7. [DOI: 10.1016/j.clinthera.2014.01.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 12/14/2013] [Accepted: 01/26/2014] [Indexed: 10/25/2022]
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Hypersensitivity to oxaliplatin: clinical features and risk factors. BMC Pharmacol Toxicol 2014; 15:1. [PMID: 24417770 PMCID: PMC3896838 DOI: 10.1186/2050-6511-15-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 11/27/2013] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Oxaliplatin-based regimens induce a potential risk of hypersensitivity reaction (HSR), with incidence varying from 10% to 25% and lack of clearly identified risk factors. The present study aimed to assess incidence and risk factors in HSR. METHODS All patients treated with oxaliplatin in the Medical Oncology Department of the Lyon Sud University Hospital (Hospices Civils de Lyon, France) from October 2004 to January 2011 were enrolled. Incidence and severity of HSR were analyzed retrospectively and the potential clinicopathological covariates were tested on univariate and multivariate analysis. RESULTS A total of 1,221 doses of oxaliplatin were administered for 191 patients, 8.9% of whom experienced an HSR. Seventeen HSRs were observed, with 1.6% grade 3 and no grade 4 events. The first reaction appeared after a median of 3 oxaliplatin infusions. Using univariate analysis, HSR was associated with younger age (mean age, 56.2 years; p = 0.04), female gender (p = 0.01) and prior exposure to platinum salts (p = 0.02). No increased risk was associated with mean dose or with presence of atopic background. Multivariate analysis confirmed that women were at higher risk of oxaliplatin HSR than men (p < 0.05). Reintroduction of oxaliplatin was effective in 64.7% of hypersensitive patients using an appropriate premedication strategy. Patients who experienced a grade 3 HSR were not rechallenged. CONCLUSION The risk of developing oxaliplatin HSR should not be underestimated (8.9% of patients). The medical team's vigilance should be increased with women, younger patients and patients with prior exposure to platinum salts.
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Prognostication of cardiac CT angiography. Minerva Cardioangiol 2012; 60:331-346. [PMID: 22653046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The rapidly emerging technique of cardiac computed tomography angiography (CTA) has enabled the anatomical assessment of coronary artery disease. CTA has very good diagnostic accuracy with the ability to detect nonobstructive from obstructive coronary artery disease and provides information on the presence of coronary artery calcification as well as on left ventricular function. Over the last few years, many prognostic studies have reviewed the outcome benefit of different scoring indices in predicting hard cardiac events. The following article will review the most recent literature available on the use of CTA in measuring luminal stenoses, identifying high-risk obstructive CAD, calcium plaque score, and LV function all in different models with their impact on the estimation of clinical risk. More recent data from a large multicenter registry supports the incremental benefit of CAD severity and LVEF as independent predictors of prognosis. Future directions and emerging applications such as the utility of CTA combined with perfusion analysis may lead to a new anatomical-functional diagnostic test that may provide optimal noninvasive assessment of coronary artery anatomy and be superior to invasive coronary angiography.
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Cas d’une intoxication sévère à l’acide valproïque : intérêt d’un traitement par épuration extrarénale combiné à la L-carnitine. ACTA ACUST UNITED AC 2011; 30:752-4. [DOI: 10.1016/j.annfar.2011.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Accepted: 05/05/2011] [Indexed: 11/26/2022]
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Biological and Molecular Characterization of the Cucurbit aphid-borne yellows virus Affecting Cucurbits in Tunisia. PLANT DISEASE 2009; 93:1065-1072. [PMID: 30754375 DOI: 10.1094/pdis-93-10-1065] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Surveys of yellowing viruses under nonheated and geothermal heated plastic tunnels and in open field crops of melon (Cucumis melo), cucumber (C. sativus), zucchini (Cucurbita pepo), squash (C. maxima), watermelon (Citrullus lanatus), and ware cucurbit (Ecballium elaterium) were carried out year-round during 2000-2001, 2003, and 2004 in the major cucurbit-growing areas in Tunisia. Severe yellowing symptoms on older leaves of cucurbits were observed in open fields and under plastic-tunnel production systems. These yellowing symptoms and large populations of aphids (Aphis gossypii) on a diversity of cucurbit crops in Tunisia support the hypothesis of a viral cause of the disease. Virus identification using double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA), followed by reverse transcription-polymerase chain reaction (RT-PCR) and immunocapture (IC)-RT-PCR showed that Cucurbit aphid-borne yellows virus (CABYV) was largely distributed in melon, cucumber, zucchini, squash, and watermelon crops. Ware cucurbit (E. elaterium) and lettuce (Lactuca sativa) crops were identified as potential CABYV reservoirs. The RT-PCR-amplified partial coat protein (CP) and P4 genes were cloned and sequenced from nine Tunisian CABYV isolates. CP and P4 gene nucleotide and amino acid sequence comparisons as well as phylogenetic reconstructions showed that the Tunisian isolates clustered into two major subgroups. Comparisons with CABYV sequences retrieved from GenBank showed high nucleotide and CP amino acid identities, and close relationships of the Tunisian isolates with Italian and French isolates.
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Twelve new polymorphic microsatellite loci and PCR multiplexing in the whitefly, Bemisia tabaci. Mol Ecol Resour 2008; 8:1004-7. [PMID: 21585955 DOI: 10.1111/j.1755-0998.2008.02163.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Twelve new dinucleotide microsatellite loci of the whitefly, Bemisia tabaci, were obtained from enriched genomic libraries. Three polymerase chain reaction multiplex sets comprising three, five and four loci were optimized and characterized across 133 B. tabaci females from Israeli rearings and natural populations collected in four Mediterranean countries (Tunisia, France, Spain and Morocco). There were three to 24 alleles per locus and the observed heterozygosity was from 0.084 to 0.420. Deviation from Hardy-Weinberg equilibrium was detected at four loci associated with significant heterozygote deficiencies due to null alleles and presence of subpopulations that were mostly in the Tunisian sample. The 12 loci carried independent information.
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Microsatellite variability in the entomopathogenic fungus Paecilomyces fumosoroseus: genetic diversity and population structure. Mycologia 2007; 99:693-704. [DOI: 10.3852/mycologia.99.5.693] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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The Acrolepiopsis assectella silk cocoon: kairomonal function and chemical characterisation. JOURNAL OF INSECT PHYSIOLOGY 2004; 50:1065-1074. [PMID: 15607509 DOI: 10.1016/j.jinsphys.2004.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2004] [Revised: 09/17/2004] [Accepted: 09/17/2004] [Indexed: 05/24/2023]
Abstract
Two soluble sericin-like polypeptides, B1 and B2, from leek moth (Acrolepiopsis assectella) cocoons trigger host-acceptance behaviour in the parasitoid, Diadromus pulchellus (Proc. Roy. Soc. London B 269 (2002) 1879). We found that these polypeptides were particularly cysteine-rich and lost their ability to trigger host-acceptance behaviour after being denatured and purified. This suggests that inter-disulphide bonds and the secondary structure of B1 and B2 are important for their biological activity. We also isolated six insoluble polypeptides (or polypeptides of low solubility) from A. assectella cocoons. At least four of these polypeptides triggered host-acceptance behaviour. The strongest responses were observed with P22, a light-chain fibroin or a seroin-peptide, and P100, a sericin-like polypeptide that is probably more strongly associated with the silk core than are B1 and B2. In conclusion, several polypeptides from different parts of the A. assectella silk-cocoon (the insoluble core and coating of the silk thread) are able to elicit host-acceptance behaviour in D. pulchellus females. These polypeptides belong to different silk protein families and are used as kairomones by this specialist parasitoid.
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Gustatory sensilla sensitive to protein kairomones trigger host acceptance by an endoparasitoid. Proc Biol Sci 2002; 269:1879-86. [PMID: 12350249 PMCID: PMC1691116 DOI: 10.1098/rspb.2002.2077] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Proteins isolated from the host cocoon of Acrolepiopsis assectella (Lepidoptera: Yponomeutoidea) act as kairomones for host acceptance by the endoparasitoid wasp Diadromus pulchellus Wesmael (Hymenoptera: Ichneumonidae). In this study, morphological, ultrastructural and electrophysiological studies were carried out in order to identify the contact chemoreceptive sensilla on the parasitoid antennae that perceive the protein kairomones. Three types of sensillum on the antennae of the females were found to have a chemosensory function. The receptor cell(s) of one sensillar type were shown to give a positive electrophysiological response to protein kairomones. This sensillar type is apically multiporous and female specific. Consequently, this sensillum could be the one implicated in the perception of the protein kairomone that triggers the host-acceptance behaviour of D. pulchellus females.
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Could the egg itself be the source of the oviposition deterrent marker in the ectoparasitoid Dinarmus basalis? JOURNAL OF INSECT PHYSIOLOGY 1999; 45:393-400. [PMID: 12770365 DOI: 10.1016/s0022-1910(98)00138-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Females of Dinarmus basalis, a solitary ectoparasitoid, strongly avoid superparasitising hosts bearing eggs which are 20 or more hours old. Our objective was to determine the mechanism by which the factors inducing host discrimination and such an oviposition deterring effect act, and the origin of the deterrent. This study showed that the information is carried by the parasitised host. It is acquired by a transfer of molecules from the wasp egg onto the host and it requires contact between egg and host for at least 4 h. The factors transferred do not, as commonly reported in other species, come from the female's genital apparatus but from the live egg itself. Consequently, the D. basalis egg directly participates in the success of parasitism by releasing factors which elicit the oviposition host deterring effect. The originality and the ecological importance of these results are discussed.
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Multisegmental cervical spondylotic myelopathy and radiculopathy treated by multilevel oblique corpectomies without fusion. Neurosurgery 1999; 44:81-90. [PMID: 9894967 DOI: 10.1097/00006123-199901000-00046] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
OBJECTIVE The description of the technique of multilevel oblique corpectomy (MOC) without fusion in the treatment of spondylotic myelopathy and radiculopathy and the analysis of the results of this technique from a series of 101 cases are presented. METHODS MOC is performed using an anterolateral approach with control of the vertebral artery. The vertebral bodies are drilled obliquely from the lateral side toward the opposite posterolateral corner. More than half of the vertebral bodies are preserved, and no fusion procedure is required. The series of patients from 1992 through 1997 included 54 men and 47 women, with an average age of 57.9 years, who presented with myelopathy (n = 66) or radiculopathy (n = 35). MOC was realized on one to five levels from C2-C3 to C7-T1. Follow-up data were obtained by performing dynamic roentgenography, computed tomography, and magnetic resonance imaging 2 months, 1 year, and 3 years after surgery. RESULTS The results (Japanese Orthopedic Association score) were improvement in 82% of the patients, worsening in 8%, and stabilization in 10%. Better results were observed in younger patients (<50 yr). No relation between results and duration of symptoms or number of levels could be established. One death occurred as a result of multiorgan failure. No late deterioration was observed; however, three patients with particular features showed delayed instability requiring fusion. CONCLUSION MOC is a safe and efficient technique. It must be applied for patients with anterior compression and straight or kyphotic axis of the spine. No fusion is required regardless of the number of levels, providing there are no soft discs and there is no preoperative instability.
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Abstract
Sources of variability in the cost of atrial septal defect repair were assessed. Variations in practice style, inflation, and errors in data entry were found to be the 3 primary sources of cost variability.
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Role of Tyr518 and Tyr519 in the regulation of catalytic activity and substrate phosphorylation by Syk protein-tyrosine kinase. EUROPEAN JOURNAL OF BIOCHEMISTRY 1997; 246:447-51. [PMID: 9208937 DOI: 10.1111/j.1432-1033.1997.00447.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The Syk protein-tyrosine kinase is expressed in many hematopoietic cells and is involved in signaling from various receptors for antigen and Fc portions of IgG and IgE. After cross-linking of these receptors, Syk is rapidly phosphorylated on tyrosine residues. We have previously reported that Syk expressed in COS cells is predominantly phosphorylated at both Tyr518 and Tyr519 at its putative autophosphorylation site. In this study, we have examined the role of each of these two residues for the catalytic activity of Syk in vitro and for the Syk-induced phosphorylation of cellular proteins in intact cells. Mutation of either residue had minor effects on the catalytic activity of Syk, and even the double mutant [F518, F519]Syk was about 60% as active as the wild-type enzyme. In intact cells, however, all three mutants consistently failed to induce the extensive tyrosine phosphorylation of cellular proteins typically observed with wild-type Syk. We have recently shown that the doubly phosphorylated Y518/Y519 site is also the site for association of Syk with the SH2 domain of the Lck kinase, which suggests that although phosphates at Y518/Y519 may enhance the catalytic activity of Syk, its interaction with Src family protein-tyrosine kinases is at least equally important for the induction of downstream substrate phosphorylation.
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Intracanalicular and Intratemporal Facial Nerve Schwannomas. Skull Base 1996; 6:129-32. [PMID: 17170988 PMCID: PMC1656575 DOI: 10.1055/s-2008-1058905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Facial nerve schwannomas can mimic acoustic neuromas. We report herein two cases: a purely intracanalicular and an intratemporal facial nerve tumor extending into the internal auditory canal and the cerebellopontine angle. These tumors have to be suspected in patient with small-size tumors presenting with facial paralysis. We advocate translabyrinthine or middle fossa approach to facilitate nerve anastomosis. The establishment of the correct properative diagnosis is difficult, but the patient must be warned about the impossibility of preserving the facial nerve in these tumors.
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Contribution of cohort studies in understanding HIV pathogenesis: introduction of the GRIV cohort and preliminary results. Biomed Pharmacother 1996; 50:480-7. [PMID: 9091061 DOI: 10.1016/s0753-3322(97)89278-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
In the present paper we review studies performed on HIV-infected patients cohorts in order to understand AIDS disease development. The interplay between diverse factors such as the HIV envelope proteins, cellular co-receptors, the immune response with chemokines and cytokines production define the viral tropism, cytopathicity and progression of HIV disease. We present the trends of the research particularly in the domain concerning host genetics. In this context, we describe the GRIV cohort of fast and slow/non-progressors, and its use for understanding basic features of the yet unknown HIV pathogenesis mechanisms.
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[Cerebral infarction disclosing neurocysticercosis]. Rev Neurol (Paris) 1995; 151:277-80. [PMID: 7481381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
An ischaemic stroke related to neurocysticercosis observed in the Paris neighbourhood is reported. A 32-year-old man originating from Cape Verde presented a left lacunar stroke. CT scan showed multiple areas of calcifications and a left capsulostriatal lucency. Gadolinium enhanced MRI disclosed significant abnormalities surrounding the left middle cerebral artery in the sylvian fissure. The titers of anticysticercian antibodies were highly positive in the serum and the CSF. The investigations in search of another cause of the stroke were negative. The outcome was good after a treatment associating albendazole and methylprednisolone. The increasingly recognized links between neurocysticercosis and stroke, especially in endemic areas are reviewed. Neurocysticercosis is an exceptional cause of ischaemic stroke in non endemic areas. In non-endemic areas, this cause of stroke has to be systematically suspected in patients coming from endemic areas. The diagnosis is based upon MRI, CT scanner and serologic tests. Treatment requires anti-parasitic drugs. The role of the corticosteroids is discussed.
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[Neurocysticercosis disclosed by cerebrovascular complication]. JOURNAL DE RADIOLOGIE 1995; 76:119-23. [PMID: 7714863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cysticercosis in one of the most common parasitoses in the world but is rare in France. This is the case of a thirty two years old man who had a stroke which revealed a neurocysticercosis, the diagnosis of which appeared on CT-scan. MR-imaging gave a more precise topographical diagnosis of the cysticercosis lesions and allowed a physiopathological understanding of the stroke. The ischemic lesion in the lenticulostriate territory was due to cysts in the sylvian fissure at the level of the beginning of those arteries with a perilesional inflammatory reaction. We learned the link between cysticercosis and stroke studing the cases reported in the literature.
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[Ambulatory surgery: the operating room nurse]. SOINS. GYNECOLOGIE, OBSTETRIQUE, PUERICULTURE, PEDIATRIE 1994:11-14. [PMID: 7667754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Abstract
Through a mail survey in 1991, we compared the opinions of 597 physicians practicing obstetrics, 723 maternity care nurses, and 70 midwives from the province of Quebec, Canada, about selected maternity care issues, including the practice of midwifery. Results showed that divergent points of view existed between and within the three groups on many maternity care issues. Physicians were more divided over the routine use of obstetric intervention than the approach to care or their opinion about midwives. Midwives held more client-centered and less interventionist attitudes than nurses or physicians. Nurses were much more open to midwives than physicians, but 20 to 30 percent of physicians saw some advantages in legalizing the practice of midwifery. Physicians and nurses generally considered midwives as a greater professional threat to the other group than to themselves. The fact that many physicians were critical of current maternity care is difficult to reconcile with their general opposition to midwives. How and to what extent physicians will respond to women's desire for more humanized and less interventionist care remains an open question. Given the problems facing maternity care in North America, expanding midwifery services is an alternative to examine seriously.
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Midwifery defined by physicians, nurses and midwives: the birth of a consensus? CMAJ 1994; 150:691-7. [PMID: 8313288 PMCID: PMC1486358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
OBJECTIVE To describe the form of midwifery practice preferred by physicians practising obstetrics, nurses providing maternity care and midwives. DESIGN Mail survey conducted in 1991. SETTING Province of Quebec. PARTICIPANTS A systematic random sample of 844 physicians, 808 nurses and 92 midwives; 597, 723 and 92 respectively completed the questionnaire, for an overall response rate of 80%. MAIN OUTCOME MEASURES Midwife training options, range of responsibilities, location of midwifery care, relationship to other maternity care providers and degree of autonomy. RESULTS Most of the physicians, nurses and midwives surveyed agreed that if midwifery was legalized, midwives should have a university degree, provide basic care to women with normal pregnancy and delivery, provide prenatal and postnatal care in hospitals and community health centres, perform delivery in hospitals and work in close collaboration with the other maternity care professionals. Disagreement existed concerning the level of university training required, the need for training in nursing first, the scope of medical intervention performed by midwives, out-of-hospital delivery, the autonomy of midwives and control over their practice. CONCLUSION Some consensus on midwifery practice exists between physicians, nurses and midwives. In jurisdictions where opposition to midwives is strong, such consensus could serve as the starting point for the introduction of midwifery.
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[The role of the general practitioner in pathology due to AIDS]. REVUE DE L'INFIRMIERE 1993; 43:23-5. [PMID: 8511488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Criteria for 1:1 nursing care. Crit Care Nurse 1992; 12:91-4. [PMID: 1478107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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[Dietary and drug treatments of calcium nephrolithiasis (author's transl)]. LA SEMAINE DES HOPITAUX : ORGANE FONDE PAR L'ASSOCIATION D'ENSEIGNEMENT MEDICAL DES HOPITAUX DE PARIS 1979; 55:7-13. [PMID: 34218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Dietary and drug treatments of calcium nephrolithiasis depend mainly on the mineral composition of renal stones: calcium oxalate, phosphate or mixed stones. The association with an hypercalciuria is an important factor which must be taken into account because oxalates and phosphates precipitate as calcium crystals in case of urinnary oversaturation. Despite many therapies have been proposed, their efficiency seems to be rather small when they are used alone. Usually, it is necessary to act on several factors with a combination of therapeutic methods. Absorptive hypercalciuria are improved with both low calcium diets and inhibitors of calcium absorption. In renal hypercalciuria, the treatment is based on the administration of thiazide diuretics which enhance calcium renal tubular reabsorption. The other therapeutic methods depend on the nature of renal stones: urinary acidification for calcium phosphate; administration of succinimide, oral phosphate or organic phosphonates for calcium oxalate stones; association with purine biosynthesis inhibitors in case of the presence of urates in renal calculi.
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[The place of ultrasonography in the diagnosis of abdominal tumours in children (author's transl)]. ANNALES DE RADIOLOGIE 1977; 20:609-24. [PMID: 931332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
Renal atrophy involving all or part of one or both kidneys was found in 10 children with renal vein thrombosis who had been given conservative treatment. This appearance is nonspecific and can be found in any condition which disturbs the renal parenchyma. However, in a significant number of patients calcification produced a pathognomonic radiological pattern. Awareness of these late radiological manifestations may help in recognizing those cases in which renal vein thrombosis went unnoticed in the neonatal period and the patient is now found to have a perplexing radiological appearance.
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[Radiological study of 35 diverticula of the uretro-vesical junction in 27 children]. ANNALES DE RADIOLOGIE 1975; 18:771-7. [PMID: 813556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Two unusual conditions simulating ectopic ureterocele. Unilateral hydrometrocolpos with ipsilateral renal agenesis or hypoplasia, and ectopic ureteral opening into a seminal vesicle. Radiology 1975; 117:381-4. [PMID: 1178868 DOI: 10.1148/117.2.381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The clinical and radiologic findings in two infants are presented, one with unilateral hydrometrocolpos and ipsilateral renal agenesis or hypoplasia and the other with ureteral duplication with one of the ureters opening into a cystically dilated seminal vesicle. The excretory urograms of both infants suggested ectopic ureterocele. Further radiologic investigation, including lateral views of the bladder, led to the correct preoperative diagnosis. Both conditions are relatively rare, and their appearance simulating ectopic ureteroceleis even more uncommon.
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[Renal localization of lymphosarcoma in the child (author's transl)]. JOURNAL DE RADIOLOGIE, D'ELECTROLOGIE, ET DE MEDECINE NUCLEAIRE 1975; 56:685-90. [PMID: 1242730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Eight children with renal localization of a lymphosarcoma are presented. Intravenous pyelography is generally carried out in the systematic full check-up of a known case of lymphosarcoma, in order to determine the degree of extension of the disease and in order to adapt chemotherapy. The different radiological appearances are discussed. They more frequently lead to the diagnosis of more well known conditions when the diagnosis of lymphosarcoma has not yet been established.
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[Congenital diaphragm of the gastric antrum. A case in a child (author's transl)]. JOURNAL DE RADIOLOGIE, D'ELECTROLOGIE, ET DE MEDECINE NUCLEAIRE 1974; 55:143-7. [PMID: 4409028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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[Intracranial calcifications in pediatric practice]. JOURNAL BELGE DE RADIOLOGIE 1973; 56:307-17. [PMID: 4759046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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[Striated images of the upper urinary tract. Apropos of 58 cases]. JOURNAL DE RADIOLOGIE, D'ELECTROLOGIE, ET DE MEDECINE NUCLEAIRE 1973; 54:509-13. [PMID: 4749490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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