Therapie

In March 2020, World Health Organization recognized severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emergence as a public health emergency of international concern. One of the major preventative measures developed against coronavirus disease 2019 (COVID-19) was vaccines. To monitor their use and safety of vaccines from the first utilization in humans during clinical development phases to implementation for the general population, an enhanced national pharmacovigilance system was enabled by the French National Agency for Medicines and Health Products Safety in collaboration with the 30 Regional Pharmacovigilance Centres. Here, we review the significant outcomes from a 2-year collaboration experience between the French National Agency for Medicines and Health Products Safety, the 30 Regional Pharmacovigilance Centres, disease-related experts and the pharmacovigilance and risk assessment committee at the European medicine agency. In France, until January 2023, over 155 million doses of COVID-19 vaccines were administrated, and 190,000 adverse events following immunizations (25% classified as serious) were analysed. Altogether 53 potential safety signals were reported to the Pharmacovigilance and Risk Assessment Committee at the European Medicine Agency by the French National Agency for Medicines and Health Products Safety: 13 were confirmed, 24 are still under investigation and 16 were not confirmed. The enhanced national PV system contributed actively better to define the safety profile of the newly developed vaccines, and the French National Agency for Medicines and Health Products Safety continues to monitor the benefit and risks of the COVID-19 vaccines

The Intensity of IUGR-Induced Transcriptome Deregulations Is Inversely Correlated with the Onset of Organ Function in a Rat Model

A low-protein diet applied during pregnancy in the rat results in intrauterine growth restricted (IUGR) fetuses. In humans, IUGR is associated with increased perinatal morbidity, higher incidence of neuro-developmental defects and increased risk of adult metabolic anomalies, such as diabetes and cardiovascular disease. Development and function of many organs are affected by environmental conditions such as those inducing fetal and early postnatal growth restriction. This phenomenon, termed “fetal programming” has been studied unconnectedly in some organs, but very few studies (if any) have investigated at the same time several organs, on a more comparative basis. However, it is quite probable that IUGR affects differentially most organ systems, with possible persistent changes in gene expression. In this study we address transcriptional alterations induced by IUGR in a multi-organ perspective, by systematic analysis of 20-days rat fetuses. We show that (1) expressional alterations are apparently stronger in organs functioning late in foetal or postnatal life than in organs that are functioning early (2) hierarchical classification of the deregulations put together kidney and placenta in one cluster, liver, lungs and heart in another; (3) the epigenetic machinery is set up especially in the placenta, while its alterations are rather mild in other organs; (4) the genes appear deregulated in chromosome clusters; (5) the altered expression cascades varies from organ to organ, with noticeably a very significant modification of the complement and coagulation cascades in the kidney; (6) we found a significant increase in TF binding site for HNF4 proteins specifically for liver genes that are down-regulated in IUGR, suggesting that this decrease is achieved through the action of HNF transcription factors, that are themselves transcriptionnally induced in the liver by IUGR (x 1.84 fold). Altogether, our study suggests that a combination of tissue-specific mechanisms contributes to bring about tissue-driven modifications of gene cascades. The question of these cascades being activated to adapt the organ to harsh environmental condition, or as an endpoint consequence is still raised

Clinical research in newborn infants: difficulties and specificity

International audienc

Extrême prématurité (prise en charge périnatale, devenir neonatal et à l'âge de deux ans, étude rétrospective descriptive réalisée au CHU de Grenoble entre 2000 et 2004)

Les avancées médicales périnatales de ces vingt dernières années ont permis une meilleure prise en charge d enfants naissant à un âge gestationnel de plus en plus bas, aux limites de viabilité. Malgré une augmentation du taux de survie, le taux de séquelles plus ou moins sévères augmente quand l âge gestationnel diminue. Une étude locale rétrospective a été menée pour apporter des données concrètes et aider à mieux informer les parents et les soignants sur le devenir des enfants nés avant 28 SA. Nos résultats semblent similaires aux données de la littérature: le taux de survie de ces enfants augmente proportionnellement à l âge gestationnel, il dépasse 50% à 25 SA pour atteindre 70% à 27 SA. L hémorragie cérébrale reste la cause principale des décès, surtout aux limites de viabilité. En terme de morbidité, la dysplasie broncho-pulmonaire est très fréquente et les pathologies de la substance blanche telle que la leucomalacie périventriculaire touchent 5% des enfants survivants. Le suivi à deux ans montre que 80% des enfants ont un développement moteur normal. Le nombre croissant de perdus de vue et l apparition tardive des troubles cognitifs et comportementaux, mettent en évidence la nécessité d un suivi prolongé de ces enfants. Face au risque de séquelles lourdes et irréversibles responsables de handicap sévère, une réflexion éthique sur le sens et la pertinence de la prise en charge active et de la poursuite ou non des soins se pose aux équipes soignantes. Cette réflexion doit débuter si possible en anténatal en collaboration étroite avec l équipe obstétricale. Il semble important que ces décisions soient prises au cas par cas en prenant en compte l opinion des parents.GRENOBLE1-BU Médecine pharm. (385162101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Erythropoietin protects newborn rat against sevoflurane-induced neurotoxicity

International audienceIntroduction: Recent data on newborn animals exposed to anesthetics have raised safety concerns regarding anesthesia practices in young children. Indeed, studies on rodents have demonstrated a widespread increase in brain apoptosis shortly after exposure to sevoflurane, followed by long-term neurologic impairment. In this context, we aimed to evaluate the protective effect of rh-EPO, a potent neuroprotective agent, in rat pups exposed to sevoflurane.Material and methods: At postnatal day 7, 75 rat pups were allocated into three groups: SEVO + EPO (n = 27) exposed to sevoflurane 2 vol% (0.5 MAC) for 6 h in an air/O2 mixture (60/40) + 5000 UI.kg(-1) rh-EPO IP; SEVO (n = 27) exposed to sevoflurane + vehicle IP; and CONTROL (n = 21) exposed to the mixture without sevoflurane + vehicle IP. Three days after anesthesia (D10), apoptosis was quantified on brain extract with TUNEL method and caspase 3. NGF and BDNF expression was determined by Western blotting. Rats reaching adulthood were evaluated in terms of exploration capacities (object exploration duration) together with spatial and object learning (water maze and novel object test).Results: Sevoflurane exposure impaired normal behavior in adult rats by reducing the exploratory capacities during the novel object test and impaired both spatial and object learning capacities in adult rats (water maze, ratio time to find platform 3rd trial/1st trial: 1.1 ± 0.2 vs 0.4 ± 0.1; n = 9, SEVO vs CONTROL; P = 0.01). Rh-EPO reduced sevoflurane-induced behavior and learning abnormalities in adult rats (water maze, ratio time to find platform 3rd trial/1st trial: 0.3 ± 0.1 vs 1.1 ± 0.2; n = 9, SEVO + EPO vs SEVO; P = 0.01). Three days after anesthesia, rh-EPO prevented sevoflurane-induced brain apoptosis (5 ± 3 vs 35 ± 6 apoptotic cells·mm(-2) ; n = 6, SEVO + EPO vs SEVO; P = 0.01) and elevation of caspase three level and significantly increased the brain expression of BDNF and NGF (n = 6, SEVO + EPO vs SEVO; P = 0.01).Conclusion: Six hours of sevoflurane anesthesia in newborn rats induces significant long-term cognitive impairment. A single administration of rh-EPO immediately after postnatal exposure to sevoflurane reduces both early activation of apoptotic phenomenon and late onset of neurologic disorders

Case Report: Clostridium neonatale Bacteremia in a Preterm Neonate With Necrotizing Enterocolitis

International audienceNecrotizing enterocolitis is a life-threatening acquired gastrointestinal disorder among preterm neonates and is associated with a high mortality rate and long-term neurodevelopmental morbidity. No etiologic agent has been definitively established; nonetheless, the most implicated bacteria include members of the Clostridium genus. We reported here on a case of Clostridium neonatale bacteremia in a preterm neonate with necrotizing enterocolitis, providing more information regarding the potential role of this bacterium in pathogenesis of necrotizing enterocolitis. We emphasized the sporulating form of C. neonatale that confers resistance to disinfectants usually applied for the hospital environmental cleaning. Further works are needed to establish the causal relationship between the occurrence of NEC and the isolation of C. neonatale , with promising perspectives in terms of diagnostic and therapeutic management

Case Report: Clostridium neonatale Bacteremia in a Preterm Neonate With Necrotizing Enterocolitis

Necrotizing enterocolitis is a life-threatening acquired gastrointestinal disorder among preterm neonates and is associated with a high mortality rate and long-term neurodevelopmental morbidity. No etiologic agent has been definitively established; nonetheless, the most implicated bacteria include members of the Clostridium genus. We reported here on a case of Clostridium neonatale bacteremia in a preterm neonate with necrotizing enterocolitis, providing more information regarding the potential role of this bacterium in pathogenesis of necrotizing enterocolitis. We emphasized the sporulating form of C. neonatale that confers resistance to disinfectants usually applied for the hospital environmental cleaning. Further works are needed to establish the causal relationship between the occurrence of NEC and the isolation of C. neonatale, with promising perspectives in terms of diagnostic and therapeutic management.</jats:p