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University of Technology of Compiègne, France

Lecointre M.,Neovasc | Vezier C.,Neovasc | Benard M.,Institut Universitaire de France | Ramdani Y.,Neovasc | And 9 more authors.
Developmental Neurobiology | Year: 2015

Ketamine is a NMDA receptor (NMDAR) antagonist used in pediatric anesthesia. Given the role of glutamatergic signaling during brain maturation, we studied the effects of a single ketamine injection (40 mg/kg s.c) in mouse neonates depending on postnatal age at injection (P2, P5, or P10) on cortical NMDAR subunits expression and association with Membrane-Associated Guanylate Kinases PSD95 and SAP102. The effects of ketamine injection at P2, P5, or P10 on motor activity were compared in adulthood. Ketamine increased GluN2A and GluN2B mRNA levels in P2-treated mice without change in proteins, while it decreased GluN2B protein in P10-treated mice without change in mRNA. Ketamine reduced GluN2A mRNA and protein levels in P5-treated mice without change in GluN2B and GluN1. Ketamine affected the GluN2A/PSD95 association regardless of the age at injection, while GluN2B/PSD95 association was enhanced only in P5-treated mice. Microdissection of ketamine-treated mouse cortex showed a decrease in GluN2A mRNA level in superficial layers (I-IV) and an increase in all subunit expressions in deep layers (V-VI) in P5- and P10-treated mice, respectively. Our data suggest that ketamine impairs cortical NMDAR subunit developmental profile and delays the synaptic targeting of GluN2A-enriched NMDAR. Ketamine injection at P2 or P10 resulted in hyperlocomotion in adult male mice in an open field, without change in females. Voluntary running-wheel exercise showed age- and sex-dependent alterations of the mouse activity, especially during the dark phase. Overall, a single neonatal ketamine exposure led to short-term NMDAR cortical developmental profile impairments and long-term motor activity alterations persisting in adulthood. © 2014 Wiley Periodicals, Inc. Source

Bocca M.L.,Normandy University | Bocca M.L.,French Institute of Health and Medical Research | Marie S.,Normandy University | Marie S.,French Institute of Health and Medical Research | And 2 more authors.
Physiology and Behavior | Year: 2014

Objective: Sleep deprivation affects several cognitive functions subserved by the prefrontal cortex. Conflicting results have, nonetheless, been reported for inhibitory function, which could be explained by methodological bias. The present study aimed to assess the effects of sleep deprivation on response inhibition using a particularly suitable inhibition test, the antisaccade, while controlling for circadian influences on performance. For this purpose, testing was conducted at: (1) the same time of day in both the control and sleep deprivation conditions; and (2) at a time of day when inhibitory performance has been found not to be at its lowest level. Two other neuropsychological tasks (go no-go and incompatibility) were used for comparison. Methods: Twelve healthy young participants performed the three tasks in the early afternoon after a normal night and after a total sleep deprivation (TSD) night in a study with a balanced, crossover design. Results: TSD significantly impaired the error rate, the latency, and the intra-individual coefficient of variation of latency in the antisaccade task. None of these parameters were affected in the two neuropsychological tasks. Conclusions: When circadian modulation of performance is controlled, TSD impairs inhibition assessed by an antisaccade test. This result emphasizes that it is crucial to control for circadian effects when assessing cognitive performance in TSD studies since the time of testing may reveal or mask cognitive and behavioral impairments. The discrepant findings obtained with the go no-go and incompatibility tests are probably explained by the specific task demands and differences in recruitment of prefrontal regions. © 2013 Elsevier Inc. Source

Liet C.,Normandy University | Liet C.,French Institute of Health and Medical Research | Amenouche F.,Normandy University | Amenouche F.,French Institute of Health and Medical Research | And 9 more authors.
Fundamental and Clinical Pharmacology | Year: 2015

Melatonin is a potential candidate for additive therapy in cancer, neurodegenerative, and mental disorders requiring administration during the activity phase. Nevertheless, because melatonin has mostly been used as a hypnotic, less is known about its cognitive effects. In this study, we investigated the effects of acute administration of melatonin on executive, attentional, and working memory processes in rats during the activity phase. Three doses of melatonin (6, 18, or 36 mg/kg) were tested and compared to a saline control group in two behavioral tests: the Attentional Set Shifting task (for attentional and executive processes assessment) and the Spontaneous Alternation test in a Y-maze (for working memory assessment). Our results revealed that, up to 36 mg/kg, the acute administration dose of melatonin did not alter the attentional or executive processes, nor the working memory in rats. Consequently, this result may be encouraging for the use of melatonin in additive therapy during the activity phase. © 2015 Société Française de Pharmacologie et de Thérapeutique. Source

Leporrier J.,University of Rouen | Etienne M.,University of Rouen | Etienne M.,Normandy University | Chapuzet C.,University of Rouen | And 10 more authors.
Journal of Clinical Virology | Year: 2014

We report the case of a multi-experienced patient, infected with an HIV-1 strain, with selected multiple resistance mutations. We designed a novel well-tolerated and effective rescue treatment including dolutegravir, rilpivirine, and foscarnet, allowing a 60-week sustained virological response for the first time in 23 years of HIV infection. © 2014 Elsevier B.V. Source

Kwasiborski A.,Institute des science du Vegetal | Mondy S.,Institute des science du Vegetal | Chong T.-M.,University of Malaya | Barbey C.,Normandy University | And 4 more authors.
Heredity | Year: 2015

Social bacteria use chemical communication to coordinate and synchronize gene expression via the quorum-sensing (QS) regulatory pathway. In Pectobacterium, a causative agent of the blackleg and soft-rot diseases on potato plants and tubers, expression of the virulence factors is collectively controlled by the QS-signals N-acylhomoserine lactones (NAHLs). Several soil bacteria, such as the actinobacterium Rhodococcus erythropolis, are able to degrade NAHLs, hence quench the chemical communication and virulence of Pectobacterium. Here, next-generation sequencing was used to investigate structural and functional genomics of the NAHL-degrading R. erythropolis strain R138. The R. erythropolis R138 genome (6.7 Mbp) contained a single circular chromosome, one linear (250 kbp) and one circular (84 kbp) plasmid. Growth of R. erythropolis and P. atrosepticum was not altered in mixed-cultures as compared with monocultures on potato tuber slices. HiSeq-transcriptomics revealed that no R. erythropolis genes were differentially expressed when R. erythropolis was cultivated in the presence vs absence of the avirulent P. atrosepticum mutant expI, which is defective for QS-signal synthesis. By contrast 50 genes (<1% of the R. erythropolis genome) were differentially expressed when R. erythropolis was cultivated in the presence vs absence of the NAHL-producing virulent P. atrosepticum. Among them, quantitative real-time reverse-transcriptase-PCR confirmed that the expression of some alkyl-sulfatase genes decreased in the presence of a virulent P. atrosepticum, as well as deprivation of organic sulfur such as methionine, which is a key precursor in the synthesis of NAHL by P. atrosepticum. © 2015 Macmillan Publishers Limited. All rights reserved. Source

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