33 research outputs found

    Amyloidosis in familial Mediterranean fever patients: correlation with MEFV genotype and SAA1 and MICA polymorphisms effects

    Get PDF
    BACKGROUND: Familial mediterranean fever (FMF) is a recessively inherited disease characterized by recurrent crises of fever, abdominal, articular and/or thoracic pain. The most severe complication is the development of renal amyloidosis. Over 35 mutations have been discovered so far in the gene responsible for the disease, MEFV. This article aims at determining a correlation between the MEFV genotype and the occurence of amyloidosis in FMF patients, in addition to the study of the modifying effects of the SAA1 (type 1 serum amyloid A protein) and MICA (Major Histocompatibility Complex (MHC) class-I-chain-related gene A) genes on this severe complication. METHODS: Fourteen MEFV mutations were screened and the SAA1 and MICA polymorphisms tested in 30 FMF patients with amyloidosis and 40 FMF patients without amyloidosis. RESULTS: The M694V and V726A allelic frequencies were, respectively, significantly higher and lower in the group with amyloidosis, compared to the control FMF group. The beta and gamma SAA1 alleles were more frequently encountered in the group without amyloidosis, whereas the alpha allele was significantly more observed in FMF patients with amyloidosis (p < 0.025). All the MICA alleles were encountered in both patients' groups, but none of them was significantly associated with amyloidosis. CONCLUSIONS: The results suggest a protective effect of the SAA1 beta and gamma alleles on the development of amyloidosis and show the absence of a MICA modifying effect on amyloidosis development. Testing these polymorphisms on a larger sample will lead to more definite conclusions

    Exposure to negative socio-emotional events induces sustained alteration of resting-state brain networks in older adults

    Get PDF
    Basic emotional functions seem well preserved in older adults. However, their reactivity to and recovery from socially negative events remain poorly characterized. To address this, we designed a ‘task–rest’ paradigm in which 182 participants from two independent experiments underwent functional magnetic resonance imaging while exposed to socio-emotional videos. Experiment 1 (N = 55) validated the task in young and older participants and unveiled age-dependent effects on brain activity and connectivity that predominated in resting periods after (rather than during) negative social scenes. Crucially, emotional elicitation potentiated subsequent resting-state connectivity between default mode network and amygdala exclusively in older adults. Experiment 2 replicated these results in a large older adult cohort (N = 127) and additionally showed that emotion-driven changes in posterior default mode network–amygdala connectivity were associated with anxiety, rumination and negative thoughts. These findings uncover the neural dynamics of empathy-related functions in older adults and help understand its relationship to poor social stress recovery

    Evaluation de l'efficacité et de la tolérance de la bithérapie interféron-alpha / ribavirine dans le traitement de l'hépatite C chronique

    No full text
    Le traitement combinĂ© interfĂ©ron alpha-2b l ribavirine prĂ©sente une efficacitĂ© supĂ©rieure Ă  celle de l'IFN seul. Les objectifs de cette Ă©tude ont Ă©tĂ© d'Ă©valuer l'efficacitĂ© prolongĂ©e et la tolĂ©rance du traitement INF-alpha + ribavirine chez des patients non rĂ©pondeurs ou rechuteurs Ă  l'IFN seul. Un total de 68 patients porteurs d'une hĂ©patite C chronique ont Ă©tĂ© inclus dans cette Ă©tude. Parmi eux, 44 hommes et 24 femmes, d'Ăąge moyen 49 ans [31-69]. 59% Ă©taient non rĂ©pondeurs et 41% rechuteurs Ă  un prĂ©cĂ©dent traitement par IFN seul. Chaque patient a reçu 3MU d'IFN alpha-2b trois fois par semaine, associĂ© Ă  la ribavirine (1000-1200 mg par jour, adaptĂ©e au poids corporel). Pour chaque patient, ont Ă©tĂ© notĂ©s tous les effets indĂ©sirables survenus pendant le traitement. La rĂ©ponse au traitement a Ă©tĂ© dĂ©finie comme l'absence d'ARN du VHC dĂ©tectable 6 mois aprĂšs l'arrĂȘt du traitement. 44% des patients n'avaient pas d'ARN du VHC dĂ©tectable 6 mois aprĂšs l'arrĂȘt du traitement. L'infection par un gĂ©notype non 1 (74% vs 25% pour les gĂ©notypes 1, p<0,05) et une rĂ©ponse antĂ©rieure Ă  l'interfĂ©ron seul (72% vs 26% chez les patients non rĂ©pondeurs antĂ©rieurement Ă  l'interfĂ©ron seul, p<0,05) ont Ă©tĂ© retrouvĂ©s comme facteurs de bon pronostic. Nous avons notĂ© la survenue de nombreux effets indĂ©sirables, parmi lesquels l'asthĂ©nie (56%), la perte de poids (24%) ou l'anĂ©mie sĂ©vĂšre (21%). Ces effets indĂ©sirables ont conduit Ă  une diminution de dose ou Ă  une interruption momentanĂ©e du traitement chez 19% des patients et la bithĂ©rapie a Ă©tĂ© interrompue dĂ©finitivement chez 19% des patients. En conclusion, la bithĂ©rapie est un traitement efficace mais induit un nombre important d'effets indĂ©sirables. C'est pourquoi il semble important d'Ă©valuer le rapport bĂ©nĂ©fice / risque et de suivre convenablement ces patients. La rĂ©cente commercialisation de l'interfĂ©ron peg pourrait constituer une alternative au traitement des patients intolĂ©rants Ă  la ribavirine.ROUEN-BU MĂ©decine-Pharmacie (765402102) / SudocSudocFranceF

    La géométrie des carnets de Léonard de Vinci

    No full text
    International audienceLe chapitre « la gĂ©omĂ©trie des carnets de LĂ©onard de Vinci » propose des sĂ©ances d’enseignement tout au long du cycle 3 autour de la construction de figures et la rĂ©daction de programmes de construction. Les Ă©lĂšves dĂ©couvrent, avec beaucoup de curiositĂ©, les notes de LĂ©onard de Vinci laissĂ©es sur le cĂ©lĂšbre Codex Atlanticus pour percer le secret de ses constructions. L’enjeu est de travailler le cercle et le carrĂ© en isolant des figures Ă©lĂ©mentaires Ă  partir de l’observation raisonnĂ©e de figures complexes tracĂ©es Ă  la Renaissance

    The Siderophore Receptor IroN, but Not the High-Pathogenicity Island or the Hemin Receptor ChuA, Contributes to the Bacteremic Step of Escherichia coli Neonatal Meningitis

    No full text
    Using a neonatal rat meningitis model, we examined the involvement of three iron uptake systems, namely, the high-pathogenicity island, the hemin receptor ChuA, and the siderophore receptor IroN, in the pathogenesis of Escherichia coli neonatal meningitis. Only IroN appeared to play a major role during the bacteremic step of the disease
    corecore