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Denis Vivien

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https://www.readbyqxmd.com/read/29691339/outbreak-of-invasive-wound-mucormycosis-in-a-burn-unit-due-to-multiple-strains-of-mucor-circinelloides-f-circinelloides-resolved-by-whole-genome-sequencing
#1
Dea Garcia-Hermoso, Alexis Criscuolo, Soo Chan Lee, Matthieu Legrand, Marc Chaouat, Blandine Denis, Matthieu Lafaurie, Martine Rouveau, Charles Soler, Jean-Vivien Schaal, Maurice Mimoun, Alexandre Mebazaa, Joseph Heitman, Françoise Dromer, Sylvain Brisse, Stéphane Bretagne, Alexandre Alanio
Mucorales are ubiquitous environmental molds responsible for mucormycosis in diabetic, immunocompromised, and severely burned patients. Small outbreaks of invasive wound mucormycosis (IWM) have already been reported in burn units without extensive microbiological investigations. We faced an outbreak of IWM in our center and investigated the clinical isolates with whole-genome sequencing (WGS) analysis. We analyzed M. circinelloides isolates from patients in our burn unit (BU1, Hôpital Saint-Louis, Paris, France) together with nonoutbreak isolates from Burn Unit 2 (BU2, Paris area) and from France over a 2-year period (2013 to 2015)...
April 24, 2018: MBio
https://www.readbyqxmd.com/read/29605882/erratum-to-molecular-magnetic-resonance-imaging-mmri
#2
Maxime Gauberti, Antoine P Fournier, Denis Vivien, Sara Martinez de Lizarrondo
No abstract text is available yet for this article.
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29571939/modification-of-apparent-intracerebral-hematoma-volume-on-t2-%C3%A2-weighted-images-during-normobaric-oxygen-therapy-may-contribute-to-false-diagnosis
#3
Romain Goulay, Antoine Drieu, Camille Di Palma, Palma Pro-Sistiaga, Nicolas Delcroix, Laurent Chazalviel, Romaric Saulnier, Clément Gakuba, Suzanne Goursaud, Allan R Young, Maxime Gauberti, Cyrille Orset, Evelyne Emery, Denis Vivien, Thomas Gaberel
It was previously reported that normobaric oxygen therapy (NBO) significantly affected T2∗ -weighted imaging in a mouse model of intracerebral hemorrhage (ICH). However, it is unclear whether a similar phenomenon exists in large volume ICH as seen in human pathology. We investigated the effects of NBO on T2∗ -weighted images in a pig model of ICH. Our data show that NBO makes disappear a peripheral crown of the hematoma, which in turn decreases the apparent volume of ICH by 18%. We hypothesized that this result could be translated to ICH in human, and subsequently could lead to inaccurate diagnostic...
March 20, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29549467/influence-of-on-going-treatment-with-angiotensin-converting-enzyme-inhibitor-or-angiotensin-receptor-blocker-on-the-outcome-of-patients-treated-with-intravenous-rt-pa-for-ischemic-stroke
#4
Sixtine Gilliot, Igor Sibon, Jean-Louis Mas, Thierry Moulin, Yannick Béjot, Charlotte Cordonnier, Maurice Giroud, Pascal Odou, Régis Bordet, Denis Vivien, Didier Leys
BACKGROUND: Many patients who receive intravenous (i.v.) recombinant tissue-plasminogen activator (rt-PA) for acute cerebral ischemia were under angiotensin-converting enzyme inhibitors (ACE-Is) or angiotensin receptor blockers (ARBs) at stroke onset. ACE-Is and ARBs have neuroprotective properties in animal models. OBJECTIVE: To evaluate whether the 3-month outcome of patients treated with i.v. rt-PA for cerebral ischemia was influenced by on-going therapy with ACE-Is or ARBs...
May 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29540615/brain-released-alarmins-and-stress-response-synergize-in-accelerating-atherosclerosis-progression-after-stroke
#5
Stefan Roth, Vikramjeet Singh, Steffen Tiedt, Lisa Schindler, Georg Huber, Arie Geerlof, Daniel J Antoine, Antoine Anfray, Cyrille Orset, Maxime Gauberti, Antoine Fournier, Lesca M Holdt, Helena Erlandsson Harris, Britta Engelhardt, Marco E Bianchi, Denis Vivien, Christof Haffner, Jürgen Bernhagen, Martin Dichgans, Arthur Liesz
Stroke induces a multiphasic systemic immune response, but the consequences of this response on atherosclerosis-a major source of recurrent vascular events-have not been thoroughly investigated. We show that stroke exacerbates atheroprogression via alarmin-mediated propagation of vascular inflammation. The prototypic brain-released alarmin high-mobility group box 1 protein induced monocyte and endothelial activation via the receptor for advanced glycation end products (RAGE)-signaling cascade and increased plaque load and vulnerability...
March 14, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29507614/molecular-magnetic-resonance-imaging-of-endothelial-activation-in-the-central-nervous-system
#6
REVIEW
Maxime Gauberti, Antoine P Fournier, Fabian Docagne, Denis Vivien, Sara Martinez de Lizarrondo
Endothelial cells of the central nervous system over-express surface proteins during neurological disorders, either as a cause, or a consequence, of the disease. Since the cerebral vasculature is easily accessible by large contrast-carrying particles, it constitutes a target of choice for molecular magnetic resonance imaging (MRI). In this review, we highlight the most recent advances in molecular MRI of brain endothelial activation and focus on the development of micro-sized particles of iron oxide (MPIO) targeting adhesion molecules including intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1), P-Selectin and E-Selectin...
2018: Theranostics
https://www.readbyqxmd.com/read/29376456/reduced-spinal-cord-parenchymal-cerebrospinal-fluid-circulation-in-experimental-autoimmune-encephalomyelitis
#7
Antoine P Fournier, Maxime Gauberti, Aurélien Quenault, Denis Vivien, Richard Macrez, Fabian Docagne
An alteration of parenchymal cerebrospinal fluid circulation (CSF) has been proposed to take part in the pathophysiology of multiple sclerosis. By using an intragate T1-weighted high-resolution MRI of the spinal cord of freely breathing mice injected with a gadolinium chelate in the cisterna magna, we show that a parenchymal CSF circulation exists in the spinal cord, in addition to that originally described in the brain. In experimental autoimmune encephalomyelitis, a model of multiple sclerosis, we show a reduction of parenchymal CSF circulation specifically in the spinal cord but not in the brain...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29344300/general-anesthesia-inhibits-the-activity-of-the-glymphatic-system
#8
Clement Gakuba, Thomas Gaberel, Suzanne Goursaud, Jennifer Bourges, Camille Di Palma, Aurélien Quenault, Sara Martinez de Lizarrondo, Denis Vivien, Maxime Gauberti
INTRODUCTION: According to the "glymphatic system" hypothesis, brain waste clearance is mediated by a continuous replacement of the interstitial milieu by a bulk flow of cerebrospinal fluid (CSF). Previous reports suggested that this cerebral CSF circulation is only active during general anesthesia or sleep, an effect mediated by the dilatation of the extracellular space. Given the controversies regarding the plausibility of this phenomenon and the limitations of currently available methods to image the glymphatic system, we developed original whole-brain in vivo imaging methods to investigate the effects of general anesthesia on the brain CSF circulation...
2018: Theranostics
https://www.readbyqxmd.com/read/29341017/molecular-magnetic-resonance-imaging-mmri
#9
Maxime Gauberti, Antoine P Fournier, Denis Vivien, Sara Martinez de Lizarrondo
Molecular magnetic resonance imaging (mMRI) enables the detection of a protein of interest in vivo, in a noninvasive manner. The general concept of mMRI is to target a contrast agent to a protein of interest, and to perform a contrast-sensitive MRI sequence. Typically, contrast agents are made of a "contrastophore" (the part of the construct responsible for the contrast on the images) and a targeting moiety ("pharmacophore"). Recently, the development of a new family of contrastophore carrying a high payload of iron oxide (micro-sized particles of iron oxide, MPIO) has led to a dramatic increase in the sensitivity of mMRI...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29116527/worse-outcome-in-stroke-patients-treated-with-rt-pa-without-early-reperfusion-associated-factors
#10
Ramón Iglesias-Rey, Manuel Rodríguez-Yáñez, Emilio Rodríguez-Castro, José Manuel Pumar, Susana Arias, María Santamaría, Iria López-Dequidt, Pablo Hervella, Clara Correa-Paz, Tomás Sobrino, Denis Vivien, Francisco Campos, Mar Castellanos, José Castillo
Based on preclinical studies suggesting that recombinant tissue plasminogen activator (rt-PA) may promote ischemic brain injuries, we investigated in patients the possible risk of worse clinical outcome after rt-PA treatment as a result of its inability to resolve cerebral ischemia. Here, we designed a cohort study using a retrospective analysis of patients who received treatment with intravenous (4.5-h window) or intraarterial rt-PA, without or with thrombectomy. Controls were consecutive patients who did not receive recanalization treatment, who met all inclusion criteria...
November 7, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/28842432/nicotinamide-riboside-a-form-of-vitamin-b-3-protects-against-excitotoxicity-induced-axonal-degeneration
#11
Pauline Vaur, Bernard Brugg, Mathias Mericskay, Zhenlin Li, Mark S Schmidt, Denis Vivien, Cyrille Orset, Etienne Jacotot, Charles Brenner, Eric Duplus
NAD+ depletion is a common phenomenon in neurodegenerative pathologies. Excitotoxicity occurs in multiple neurologic disorders and NAD+ was shown to prevent neuronal degeneration in this process through mechanisms that remained to be determined. The activity of nicotinamide riboside (NR) in neuroprotective models and the recent description of extracellular conversion of NAD+ to NR prompted us to probe the effects of NAD+ and NR in protection against excitotoxicity. Here, we show that intracortical administration of NR but not NAD+ reduces brain damage induced by NMDA injection...
December 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28805973/experimental-and-clinical-evidence-of-differential-effects-of-magnesium-sulfate-on-neuroprotection-and-angiogenesis-in-the-fetal-brain
#12
Matthieu Lecuyer, Marina Rubio, Clément Chollat, Maryline Lecointre, Sylvie Jégou, Philippe Leroux, Carine Cleren, Isabelle Leroux-Nicollet, Loic Marpeau, Denis Vivien, Stéphane Marret, Bruno J Gonzalez
Clinical studies showed beneficial effects of magnesium sulfate regarding the risk of cerebral palsy. However, regimen protocols fluctuate worldwide and risks of adverse effects impacting the vascular system have been reported for human neonates, keeping open the question of the optimal dosing. Using clinically relevant concentrations and doses of magnesium sulfate, experiments consisted of characterizing, respectively, ex vivo and in vivo, the effects of magnesium sulfate on the nervous and vascular systems of mouse neonates by targeting neuroprotection, angiogenesis, and hemodynamic factors and in measuring, in human fetuses, the impact of a 4-g neuroprotective loading dose of magnesium sulfate on brain hemodynamic parameters...
August 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28762187/the-choroid-plexus-is-a-key-cerebral-invasion-route-for-t-cells-after-stroke
#13
Gemma Llovera, Corinne Benakis, Gaby Enzmann, Ruiyao Cai, Thomas Arzberger, Alireza Ghasemigharagoz, Xiang Mao, Rainer Malik, Ivana Lazarevic, Sabine Liebscher, Ali Ertürk, Lilja Meissner, Denis Vivien, Christof Haffner, Nikolaus Plesnila, Joan Montaner, Britta Engelhardt, Arthur Liesz
Neuroinflammation contributes substantially to stroke pathophysiology. Cerebral invasion of peripheral leukocytes-particularly T cells-has been shown to be a key event promoting inflammatory tissue damage after stroke. While previous research has focused on the vascular invasion of T cells into the ischemic brain, the choroid plexus (ChP) as an alternative cerebral T-cell invasion route after stroke has not been investigated. We here report specific accumulation of T cells in the peri-infarct cortex and detection of T cells as the predominant population in the ipsilateral ChP in mice as well as in human post-stroke autopsy samples...
December 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28754830/vascular-tissue-type-plasminogen-activator-promotes-intracranial-aneurysm-formation
#14
Paul-Emile Labeyrie, Romain Goulay, Sara Martinez de Lizarrondo, Marie Hébert, Maxime Gauberti, Eric Maubert, Barbara Delaunay, Benjamin Gory, Francesco Signorelli, Francis Turjman, Emmanuel Touzé, Patrick Courthéoux, Denis Vivien, Cyrille Orset
BACKGROUND AND PURPOSE: Although the mechanisms that contribute to intracranial aneurysm (IA) formation and rupture are not totally elucidated, inflammation and matrix remodeling are incriminated. Because tPA (tissue-type plasminogen activator) controls both inflammatory and matrix remodeling processes, we hypothesized that tPA could be involved in the pathophysiology of IA. METHODS: Immunofluorescence analyses of tPA and its main substrate within the aneurysmal wall of murine and human samples were performed...
September 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28741405/optimized-tpa-a-non-neurotoxic-fibrinolytic-agent-for-the-drainage-of-intracerebral-hemorrhages
#15
Romain Goulay, Mikaël Naveau, Thomas Gaberel, Denis Vivien, Jérôme Parcq
Intracerebral hemorrhage (ICH) is the most severe form of stroke. Catheter-delivered thrombolysis with recombinant tissue-type plasminogen activator (rtPA) for the drainage of ICH is currently under evaluation in a phase III clinical trial (MISTIE III). However, in a pig model of ICH, in situ fibrinolysis with rtPA was reported to increase peri-lesional edema by promoting N-methyl-D-aspartate (NMDA)-dependent excitotoxicity. In the present study, we engineered a non-neurotoxic tPA variant, OptPA, and investigated its safety and efficacy for in situ fibrinolysis in a rat model of ICH...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28644439/activation-of-cell-surface-grp78-decreases-endoplasmic-reticulum-stress-and-neuronal-death
#16
Morgane Louessard, Isabelle Bardou, Eloïse Lemarchand, Audrey M Thiebaut, Jérôme Parcq, Jérôme Leprince, Anne Terrisse, Valérie Carraro, Pierre Fafournoux, Alain Bruhat, Cyrille Orset, Denis Vivien, Carine Ali, Benoit D Roussel
The unfolded protein response (UPR) is an endoplasmic reticulum (ER) -related stress conserved pathway that aims to protect cells from being overwhelmed. However, when prolonged, UPR activation converts to a death signal, which relies on its PERK-eIF2α branch. Overactivation of the UPR has been implicated in many neurological diseases, including cerebral ischaemia. Here, by using an in vivo thromboembolic model of stroke on transgenic ER stress-reporter mice and neuronal in vitro models of ischaemia, we demonstrate that ischaemic stress leads to the deleterious activation of the PERK branch of the UPR...
September 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28634446/are-distal-and-proximal-visual-cues-equally-important-during-spatial-learning-in-mice-a-pilot-study-of-overshadowing-in-the-spatial-domain
#17
Marie Hébert, Jan Bulla, Denis Vivien, Véronique Agin
Animals use distal and proximal visual cues to accurately navigate in their environment, with the possibility of the occurrence of associative mechanisms such as cue competition as previously reported in honey-bees, rats, birds and humans. In this pilot study, we investigated one of the most common forms of cue competition, namely the overshadowing effect, between visual landmarks during spatial learning in mice. To this end, C57BL/6J × Sv129 mice were given a two-trial place recognition task in a T-maze, based on a novelty free-choice exploration paradigm previously developed to study spatial memory in rodents...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28533365/prediction-of-disease-activity-in-models-of-multiple-sclerosis-by-molecular-magnetic-resonance-imaging-of-p-selectin
#18
Antoine Philippe Fournier, Aurélien Quenault, Sara Martinez de Lizarrondo, Maxime Gauberti, Gilles Defer, Denis Vivien, Fabian Docagne, Richard Macrez
New strategies for detecting disease activity in multiple sclerosis are being investigated to ameliorate diagnosis and follow-up of patients. Today, although magnetic resonance imaging (MRI) is widely used to diagnose and monitor multiple sclerosis, no imaging tools exist to predict the evolution of disease and the efficacy of therapeutic strategies. Here, we show that molecular MRI targeting the endothelial adhesion molecule P-selectin unmasks the pathological events that take place in the spinal cord of mice subjected to chronic or relapsing experimental autoimmune encephalomyelitis...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28526764/subarachnoid-hemorrhage-severely-impairs-brain-parenchymal-cerebrospinal-fluid-circulation-in-nonhuman-primate
#19
Romain Goulay, Julien Flament, Maxime Gauberti, Michael Naveau, Nolwenn Pasquet, Clement Gakuba, Evelyne Emery, Philippe Hantraye, Denis Vivien, Romina Aron-Badin, Thomas Gaberel
BACKGROUND AND PURPOSE: Subarachnoid hemorrhage (SAH) is a devastating form of stroke with neurological outcomes dependent on the occurrence of delayed cerebral ischemia. It has been shown in rodents that some of the mechanisms leading to delayed cerebral ischemia are related to a decreased circulation of the cerebrospinal fluid (CSF) within the brain parenchyma. Here, we evaluated the cerebral circulation of the CSF in a nonhuman primate in physiological condition and after SAH. METHODS: We first evaluated in physiological condition the circulation of the brain CSF in Macaca facicularis , using magnetic resonance imaging of the temporal DOTA-Gd distribution after its injection into the CSF...
August 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28487393/potent-thrombolytic-effect-of-n-acetylcysteine-on-arterial-thrombi
#20
Sara Martinez de Lizarrondo, Clément Gakuba, Bradley A Herbig, Yohann Repessé, Carine Ali, Cécile V Denis, Peter J Lenting, Emmanuel Touzé, Scott L Diamond, Denis Vivien, Maxime Gauberti
BACKGROUND: Platelet cross-linking during arterial thrombosis involves von Willebrand Factor (VWF) multimers. Therefore, proteolysis of VWF appears promising to disaggregate platelet-rich thrombi and restore vessel patency in acute thrombotic disorders such as ischemic stroke, acute coronary syndrome, or acute limb ischemia. N -Acetylcysteine (NAC, a clinically approved mucolytic drug) can reduce intrachain disulfide bonds in large polymeric proteins. In the present study, we postulated that NAC might cleave the VWF multimers inside occlusive thrombi, thereby leading to their dissolution and arterial recanalization...
August 15, 2017: Circulation
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