Publications by authors named "Boyer Alexandre"

Background: Intensive care units (ICU) are characterized by high medical assistance costs and great complexity. Recommendations to determine the needs of medical staff are scarce, generating appreciable variability. The French Intensive Care Society (FICS) and the French National Council of Intensive Care Medicine (CNP MIR, Conseil National Professionel de Médecine Intensive Réanimation) have established a technical committee of experts, the purposes of which were to draft recommendations regarding staffing needs in ICUs and to propose optimal organisation of work hours, a key objective being improved workplace quality of life.

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Citizen Science initiatives have a worldwide impact on environmental research by providing data at a global scale and high resolution. Mapping marine biodiversity remains a key challenge to which citizen initiatives can contribute. Here we describe a dataset made of both underwater and aerial imagery collected in shallow tropical coastal areas by using various low cost platforms operated either by citizens or researchers.

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  • The study explores the role of glycerol-3-phosphate phosphatase (G3PP) in male fertility, highlighting its crucial expression in the testis and sperm, especially during spermatogenesis.
  • Researchers found that male mice lacking G3PP (cG3PP-KO) are infertile due to dysfunctional sperm with poor motility and increased oxidative stress, while a tamoxifen-inducible version (icG3PP-KO) maintained some fertility due to a small number of normal sperm.
  • The results suggest that G3PP is vital for sperm function and health, as its absence leads to abnormal sperm production and metabolism, impacting overall male fertility.
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  • * The tumor identified was a sex cord-stromal (granulosa cell) tumor, and the heifer's sex chromosome type was confirmed to be XX, indicating an ovotesticular disorder of sexual development with female characteristics.
  • * This case highlights that while disorders of sexual development are common in mammals, the occurrence of gonadal tumors in these conditions is infrequent and has not been previously documented in cattle.
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  • This study investigated the role of micro-RNAs in understanding pain processing in osteoarthritis by using the MI-RAT model, which simulates arthritis in rats.
  • Researchers examined various pain responses, structural damage, and neuropeptide levels in both arthritis-affected and healthy rats over a period of 56 days.
  • Results indicated significant cartilage damage and persistent pain hypersensitivity in the arthritis group, along with notable changes in neuropeptide expression and microRNA levels that could inform future pain management strategies.
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Background: Inspiratory muscle training (IMT) is well-established as a safe option for combating inspiratory muscles weakness in the intensive care setting. It could improve inspiratory muscle strength and decrease weaning duration but a lack of knowledge on the optimal training regimen raise to inconsistent results. We made the hypothesis that an innovative mixed intensity program for both endurance and strength improvement could be more effective.

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Ancylostoma caninum is a widely prevalent parasitic nematode in dogs across the world. There has been a notable increase in reports of anthelmintic resistance in A. caninum within the United States of America in recent years, which has led us to investigate the potential of this scenario in Canada.

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Recent reports suggest that the Hippo signaling pathway regulates testis development, though its exact roles in Sertoli cell differentiation remain unknown. Here, we examined the functions of the main Hippo pathway kinases, large tumor suppressor homolog kinases 1 and 2 (Lats1 and Lats2) in developing mouse Sertoli cells. Conditional inactivation of Lats1/2 in Sertoli cells resulted in the disorganization and overgrowth of the testis cords, the induction of a testicular inflammatory response and germ cell apoptosis.

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Background: Acute respiratory distress syndrome (ARDS) is responsible for 400,000 deaths annually worldwide. Few improvements have been made despite five decades of research, partially because ARDS is a highly heterogeneous syndrome including various types of aetiologies. Lower airway microbiota is involved in chronic inflammatory diseases and recent data suggest that it could also play a role in ARDS.

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Background: Acute kidney injury (AKI) in intensive care unit (ICU) patients with severe COVID-19 is common (> 50%). A specific inflammatory process has been suggested in the pathogenesis of AKI, which could be improved by dexamethasone (DXM). In a small monocenter study (n = 100 patients), we reported a potential protective effect of DXM on the risk of AKI.

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Background: The benefit-risk balance and optimal timing of surgery for severe infective endocarditis (IE) with ischemic or hemorrhagic strokes is unknown. The study aim was to compare the neurological outcome between patients receiving surgery or not.

Methods: In a prospective register-based multicenter ICU study, patients were included if they met the following criteria: (i) left-sided IE with an indication for heart surgery; (ii) with cerebral complications documented by cerebral imaging before cardiac surgery; (iii) with Sequential Organ Failure Assessment score ≥ 3.

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Background: Group A Streptococcus is responsible for severe and potentially lethal invasive conditions requiring intensive care unit (ICU) admission, such as streptococcal toxic shock-like syndrome (STSS). A rebound of invasive group A streptococcal (iGAS) infection after COVID-19-associated barrier measures has been observed in children. Several intensivists of French adult ICUs have reported similar bedside impressions without objective data.

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  • In September 2023, a botulism outbreak linked to canned sardines affected 15 people in Bordeaux, France, during the Rugby World Cup.
  • Eight patients from four countries were admitted to the ICU, with six needing invasive mechanical ventilation.
  • The incident emphasizes the need for quick global alerts from health authorities to mitigate the impact of health crises during major international events.
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  • * The role of the Hippo pathway effector yes-associated protein (YAP) has been linked to similar issues in humans and mice, prompting research into its potential involvement in COD.
  • * Recent findings show that YAP levels are significantly higher in cystic ovarian cells compared to non-cystic cells, suggesting that YAP may contribute to the development and persistence of ovarian cysts in dairy cattle.
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  • Ventilator-associated pneumonia (VAP) is a common infection in patients on mechanical ventilation, and this study looks into the gut microbiota's role in its development, compared to oropharyngeal and lung microbiota.
  • Researchers analyzed the gut microbiota of 42 ICU patients, finding that while the overall diversity of bacteria (α-diversity) was similar, the specific composition (β-diversity) differed between those who developed VAP and those who did not.
  • The study suggests that certain gut fungal species may influence the likelihood of developing VAP and encourages further research on how gut microbiota might impact lung infections in critically ill patients.
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Background: The worldwide dissemination of extended spectrum beta-lactamase producing Enterobacteriales (ESBL-E) is of major concern. Microbiota may play a role in the host resistance to colonization with ESBL-E, but the underlying mechanisms remain unknown. We aimed to compare the gut microbiota composition between ESBL-producing E.

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Chronic obstructive pulmonary disease (COPD) affects more than 200 million people worldwide. The chronic course of COPD is frequently worsened by acute exacerbations (AECOPD). Mortality in patients hospitalized for severe AECOPD remains dramatically high, and the underlying mechanisms are poorly understood.

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Background: The rise in antimicrobial resistance is a global threat responsible for about 33,000 deaths in 2015 with a particular concern for extended-spectrum beta-lactamase-producing Enterobacterales (ESBL-E) and has led to a major increase in the use of carbapenems, last-resort antibiotics.

Methods: In this retrospective propensity-weighted multicenter observational study conducted in 11 ICUs, the purpose was to assess the efficacy of non carbapenem regimen (piperacillin-tazobactam (PTZ) + aminoglycosides or 3rd-generation cephalosporin (3GC) + aminoglycosides) as empiric therapy in comparison with carbapenem in extended-spectrum β-lactamase-producing Enterobacterales (ESBL-E) urinary septic shock. The primary outcome was Day-30 mortality.

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Background: The extent of the consequences of an episode of severe acute kidney injury (AKI) on long-term outcome of critically ill patients remain debated. We conducted a prospective follow-up of patients included in a large multicenter clinical trial of renal replacement therapy (RRT) initiation strategy during severe AKI (the Artificial Kidney Initiation in Kidney Injury, AKIKI) to investigate long-term survival, renal outcome and health related quality of life (HRQOL). We also assessed the influence of RRT initiation strategy on these outcomes.

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Purpose: In young adults (18 to 49 years old), investigation of the acute respiratory distress syndrome (ARDS) after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has been limited. We evaluated the risk factors and outcomes of ARDS following infection with SARS-CoV-2 in a young adult population.

Methods: A retrospective cohort study was conducted between January 1st, 2020 and February 28th, 2021 using patient-level electronic health records (EHR), across 241 United States hospitals and 43 European hospitals participating in the Consortium for Clinical Characterization of COVID-19 by EHR (4CE).

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The cortex of the adrenal gland is organized into concentric zones that produce distinct steroid hormones essential for body homeostasis in mammals. Mechanisms leading to the development, zonation and maintenance of the adrenal cortex are complex and have been studied since the 1800s. However, the advent of genetic manipulation and transgenic mouse models over the past 30 years has revolutionized our understanding of these mechanisms.

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Recent conditional knockout of core components of the Hippo signaling pathway in the adrenal gland of mice has demonstrated that this pathway must be tightly regulated to ensure proper development and maintenance of the adrenal cortex. We report herein that the most upstream kinases of the pathway, the mammalian STE20-like protein kinases 1 and 2 (MST1and MST2, respectively), are expressed in the mouse adrenal cortex with MST2 expression being restricted to the zona glomerulosa (zG). To further explore the role of Hippo signaling in adrenocortical cells, we conditionally deleted in steroidogenic cells using an Nr5a1-cre strain ( -cre).

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Hippo signaling plays an essential role in the development of numerous tissues. Although it was previously shown that the transcriptional effectors of Hippo signaling Yes-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ) can fine-tune the regulation of sex differentiation genes in the testes, the role of Hippo signaling in testis development remains largely unknown. To further explore the role of Hippo signaling in the testes, we conditionally deleted the key Hippo kinases large tumor suppressor homolog kinases 1 and -2 ( and , two kinases that antagonize YAP and TAZ transcriptional co-regulatory activity) in the somatic cells of the testes using an -cre strain (;;-cre).

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