Discrétisations associées à un processus dans un domaine et Schémas numériques probabilistes pour les EDP paraboliques quasi-linéaires

PARIS-BIUSJ-Thèses (751052125) / SudocPARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF

Néphropathies secondaires à un défaut de régulation de la voie alterne du complément (à propos d'une cohorte de 11 cas.)

STRASBOURG-Medecine (674822101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Phospholipase A2 Receptor–Related Membranous Nephropathy and Mannan-Binding Lectin Deficiency

International audienceMost patients with idiopathic membranous nephropathy (IMN) have IgG4 autoantibodies against phospholipase A2 receptor (PLA2R). C3 and C5b-9 are found in immune deposits of IMN kidney biopsy specimens, but the pathway of complement activation in IMN remains elusive. We report the case of a patient who developed IMN with intense staining for PLA2R, IgG4, C3, C5b-9, factor B, and properdin and very weak staining for C1q, C4d, and IgG1. Measurement of mannan binding lectin (MBL) antigenic level and activity revealed MBL deficiency. Genotyping revealed a heterozygous (A/C) polymorphism in codon 57 of MBL2 exon 1 associated with homozygous and heterozygous variations in the promoter region at -550 (L/L) and -221 (X/Y), respectively, suggesting that the patient harbored the LXA/LYC haplotypes linked to MBL deficiency. Genetic sequencing in 77 consecutive patients with IMN identified four patients with MBL2 promoter and coding region variations associated with MBL deficiency and the same complement pattern in immune deposits as the index patient. In contrast, patients with wild-type MBL2 had immune deposits with intense Cd4 staining. Thus, IMN can develop in patients with complete MBL deficiency, with complement activated mainly by the alternative pathway, whereas the lectin pathway is also activated in those with wild-type MBL2

Maladies infectieuses : ce qui a changé en 2023

The year 2023 saw the publication of several studies in various areas of infectious diseases. The administration of corticosteroids decreased mortality in severe community-acquired pneumonia. Administration of doxycycline post-exposure prophylaxis reduced the risk of bacterial sexually transmitted infections at the risk of resistance selection. An herbal preparation decreased mortality in sepsis. A meta-analysis concludes that oseltamivir does not significantly reduce the risk of hospitalisation for influenza. Discontinuation of antibiotic prophylaxis during dental procedures in Sweden did not increase the incidence of viridans group Streptococcus endocarditis. Several studies have led to the introduction of RSV (Respiratory Syncytial Virus (RSV) vaccination. 2023 also saw the resurgence of invasive Group A Streptococcal infections, of which clinicians must be wary.L’année 2023 est marquée par la publication d’études touchant des domaines variés de l’infectiologie. La mortalité de pneumonies communautaires sévères est diminuée par l’administration de corticostéroïdes. Lors de rapport sexuel à risque, l’administration de doxycycline en prophylaxie postexpositionnelle diminue le risque d’infections sexuellement transmissibles bactériennes, cependant au risque de sélectionner des bactéries résistantes. Une préparation de plantes diminue la mortalité du sepsis. Une méta-analyse conclut que l’oseltamivir ne diminue pas significativement le risque d’hospitalisation lors de grippe. L’arrêt de la prophylaxie antibiotique lors d’intervention dentaire en Suède n’a pas augmenté l’incidence d’endocardite à streptocoques du groupe viridans. Plusieurs études ont mené à l’introduction de la vaccination VRS (virus respiratoire syncytial humain). 2023 a aussi vu la résurgence d’infections invasives à streptocoques du groupe A dont le clinicien doit se méfier

Symbiotic status does not preclude hybridisation in Mediterranean octocorals

International audienceUnderstanding how species can form and remain isolated in the marine environment is still an active research area. Correctly delimiting species if also of interest for biodiversity conservation and for a wide range of biological studies. Here we study the differentiation and the possibility of hybridization among three temperate octocorals : Eunicella cavolini, E. singularis and E. verrucosa. These species can occur in sympatry and morphologically intermediate individuals have been observed. Among these three species, E. singularis is the only one known to show a mutualistic symbiosis with photosynthetic Symbiodiniaceae. As symbiotic relationships can be involved in species barriers, we tested here the possibility of hybridization between symbiotic and non-symbiotic Eunicella species. Through multivariate analyses and hybrid detection, we prove the existence of current gene flow between E. singularis and E. cavolini, with the observation of F1 and F2 hybrids and backcrosses. Demographic inferences indicate a scenario of secondary contact between these two species. Our data suggest an intermediate abundance of Symbiodiniaceae in the hybrids of the two species. We discuss the evolution of the Symbiodiniaceae / cnidarian symbiosis in the light of our results

Complement C1q Interacts With LRP1 Clusters II and IV Through a Site Close but Different From the Binding Site of Its C1r and C1s-Associated Proteases

International audienc

Niveau d’activité physique et contrôle ambulatoire de l’hypertension artérielle. Résultats de l’étude pilote « Acti-HTA »

Retour sur les 34èmes Journées de l’Hypertension ArtérielleInternational audienceWhile physical activity (PA) is recommended for high blood pressure management, the level of PA practice of hypertensive patients remains unclear. We aimed to assess the association between the level of both PA and blood pressure of individuals consulting in 9 hypertension specialist centres. Eighty-five hypertensive patients were included (59 ± 14 years, 61% men, 12% smokers, 29% with diabetes). Following their consultation, they performed home blood pressure measurement (HBPM) over 7 days (2 in the morning+2 in the evening), they wrote in a dedicated form their daily activities to estimate the additional caloric expenditure using Acti-MET device (built from International physical Activity Questionnaire [IPAQ]). Thus, patients completed a self-administered questionnaire "score of Dijon" (distinguishing active subjects with a score>20/30, from sedentary 20/30, des sédentaires < 10/30). Les hypertendus contrôlés en AMT (< 135/85 mm Hg) (55 % des sujets), en comparaison aux non contrôlés, étaient plus âgés, avaient une tendance non significative à une dépense calorique déclarée plus élevée (4959 ± 5045 kcal/semaine vs 4048 ± 4199 kcal/semaine, p = 0,3755) et leur score de Dijon (19,44 ± 5,81 vs 18,00 ± 4,32, p = 0,2094) montrait une proportion de sujets « actifs » plus importante (48,9 % vs 34,2 %, p = 0,1773). En conclusion, nos résultats ont objectivé une « tendance » à une AP déclarée plus importante pour les sujets dont l’HTA est contrôlée. Ceci nous encourage à poursuivre par une étude qui inclurait davantage de sujets et dont l’AP serait évaluée par le port pendant 7 jours d’un capteur de type accéléromètre (méthode objective)