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dc.rights.licenseopenen_US
hal.structure.identifierFaculté de médecine et des sciences de la santé [Sherbrooke] [UdeS]
dc.contributor.authorFLAIVE, Aurelie
hal.structure.identifierNeurocentre Magendie : Physiopathologie de la Plasticité Neuronale [U1215 Inserm - UB]
dc.contributor.authorCABELGUEN, Jean-Marie
hal.structure.identifierFaculté de médecine et des sciences de la santé [Sherbrooke] [UdeS]
dc.contributor.authorRYCZKO, Dimitri
dc.date.accessioned2023-09-26T16:31:19Z
dc.date.available2023-09-26T16:31:19Z
dc.date.issued2020-06-01
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/183805
dc.description.abstractEnSerotoninergic (5-HT) neurons are powerful modulators of spinal locomotor circuits. Most studies on 5-HT modulation focused on the effect of exogenous 5-HT and these studies provided key information about the cellular mechanisms involved. Less is known about the effects of increased release of endogenous 5-HT with selective serotonin reuptake inhibitors. In mammals, such molecules were shown to destabilize the fictive locomotor output of spinal limb networks through 5-HT1A receptors. However, in tetrapods little is known about the effects of increased 5-HT release on the locomotor output of axial networks, which are coordinated with limb circuits during locomotion from basal vertebrates to mammals. Here, we examined the effect of citalopram on fictive locomotion generated in axial segments of isolated spinal cords in salamanders, a tetrapod where raphe 5-HT reticulospinal neurons and intraspinal 5-HT neurons are present as in other vertebrates. Using electrophysiological recordings of ventral roots, we show that fictive locomotion generated by bath-applied glutamatergic agonists is destabilized by citalopram. Citalopram-induced destabilization was prevented by a 5-HT1A receptor antagonist, whereas a 5-HT1A receptor agonist destabilized fictive locomotion. Using immunofluorescence experiments, we found 5-HT-positive fibers and varicosities in proximity with motoneurons and glutamatergic interneurons that are likely involved in rhythmogenesis. Our results show that increasing 5-HT release has a deleterious effect on axial locomotor activity through 5-HT1A receptors. This is consistent with studies in limb networks of turtle and mouse, suggesting that this part of the complex 5-HT modulation of spinal locomotor circuits is common to limb and axial networks in limbed vertebrates.NEW & NOTEWORTHY Little is known about the modulation exerted by endogenous serotonin on axial locomotor circuits in tetrapods. Using axial ventral root recordings in salamanders, we found that a serotonin reuptake blocker destabilized fictive locomotor activity through 5-HT1A receptors. Our anatomical results suggest that serotonin is released on motoneurons and glutamatergic interneurons possibly involved in rhythmogenesis. Our study suggests that common serotoninergic mechanisms modulate axial motor circuits in amphibians and limb motor circuits in reptiles and mammals.
dc.language.isoENen_US
dc.subject.en5-HT1A
dc.subject.enCitalopram
dc.subject.enLocomotion
dc.subject.enSalamander
dc.subject.enSerotonin
dc.title.enThe serotonin reuptake blocker citalopram destabilizes fictive locomotor activity in salamander axial circuits through 5-HT1A receptors
dc.title.alternativeJ Neurophysiolen_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1152/jn.00179.2020en_US
dc.subject.halSciences du Vivant [q-bio]/Neurosciences [q-bio.NC]en_US
dc.identifier.pubmed32401145en_US
bordeaux.journalJournal of Neurophysiologyen_US
bordeaux.page2326-2342en_US
bordeaux.volume123en_US
bordeaux.hal.laboratoriesNeurocentre Magendie - U1215en_US
bordeaux.issue6en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionINSERMen_US
bordeaux.teamRelations glie-neuroneen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.identifier.funderIDCanadian Institutes of Health Researchen_US
bordeaux.identifier.funderIDNatural Sciences and Engineering Research Council of Canadaen_US
bordeaux.identifier.funderIDFaculté de médecine et des sciences de la santé, Université de Sherbrookeen_US
hal.identifierhal-04218730
hal.version1
hal.date.transferred2023-09-26T16:31:33Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Neurophysiology&rft.date=2020-06-01&rft.volume=123&rft.issue=6&rft.spage=2326-2342&rft.epage=2326-2342&rft.au=FLAIVE,%20Aurelie&CABELGUEN,%20Jean-Marie&RYCZKO,%20Dimitri&rft.genre=article


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