0000000001012621

AUTHOR

Carlos F. Ibáñez

showing 3 related works from this author

BDNF regulates spontaneous correlated activity at early developmental stages by increasing synaptogenesis and expression of the K+/Cl- co-transporter…

2003

Spontaneous neural activity is a basic property of the developing brain,which regulates key developmental processes, including migration, neural differentiation and formation and refinement of connections. The mechanisms regulating spontaneous activity are not known. By using transgenic embryos that overexpress BDNF under the control of the nestin promoter, we show here that BDNF controls the emergence and robustness of spontaneous activity in embryonic hippocampal slices. Further, BDNF dramatically increases spontaneous co-active network activity, which is believed to synchronize gene expression and synaptogenesis in vast numbers of neurons. In fact, BDNF raises the spontaneous activity of…

SynaptogenesisMice TransgenicHippocampal formationInhibitory postsynaptic potentialHippocampusMicePostsynaptic potentialAnimalsPremovement neuronal activityMolecular Biologygamma-Aminobutyric AcidSymportersbiologyGlutamate DecarboxylaseBrain-Derived Neurotrophic FactorGlutamate receptorBrainReceptors NeurotransmitterCell biologyIsoenzymesnervous systemSynapsesbiology.proteinGABAergicDevelopmental BiologyNeurotrophinDevelopment
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Activation of the p75 neurotrophin receptor through conformational rearrangement of disulphide-linked receptor dimers.

2009

Ligand-mediated dimerization has emerged as a universal mechanism of growth factor receptor activation. Recent structural studies have shown that neurotrophins interact with dimers of the p75 neurotrophin receptor (p75NTR), but the actual mechanism of receptor activation has remained elusive. Here we show that p75NTR forms disulphide-linked dimers independently of neurotrophin binding through the highly conserved Cys257 in its transmembrane domain. Mutation of Cys257 abolished neurotrophin-dependent receptor activity but did not affect downstream signaling by the p75NTR/NgR/Lingo-1 complex in response to MAG, indicating the existence of distinct, ligand-specific activation mechanisms for p7…

Protein ConformationMutantNeuronesReceptor Nerve Growth FactorMiceProtein structureChlorocebus aethiopsNerve Growth FactorLow-affinity nerve growth factor receptorRNA Small InterferingReceptorskin and connective tissue diseasesReceptors neuralsCells CulturedNeuronsCell DeathGeneral NeuroscienceNF-kappa BCell biologyTransmembrane domainSIGNALINGOligopeptidesNeurotrophinProtein BindingSignal Transductionmusculoskeletal diseasesPROTEINSNeuroscience(all)Green Fluorescent ProteinsNerve Tissue ProteinsReceptors Nerve Growth FactorSuperior Cervical GanglionBiologyTransfectionMOLNEUROArticleGrowth factor receptorAnimalsHumansProtein Interaction Domains and MotifsReceptors Growth FactorCysteineBinding SitesMembrane Proteinsbiological factorsRatsnervous systemAnimals NewbornNeurotrophin bindingMutationbiology.proteinsense organsProtein MultimerizationrhoA GTP-Binding ProteinProteïnesNeuron
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Neuromuscular junction disassembly and muscle fatigue in mice lacking neurotrophin-4

2001

Neurotrophin-4 (NT-4) is produced by slow muscle fibers in an activity-dependent manner and promotes growth and remodeling of adult motorneuron innervation. However, both muscle fibers and motor neurons express NT-4 receptors, suggesting bidirectional NT-4 signaling at the neuromuscular junction. Mice lacking NT-4 displayed enlarged and fragmented neuromuscular junctions with disassembled postsynaptic acetylcholine receptor (AChR) clusters, reduced AChR binding, and acetylcholinesterase activity. Electromyographic responses, posttetanic potentiation, and action potential amplitude were also significantly reduced in muscle fibers from NT-4 knock-out mice. Slow-twitch soleus muscles from thes…

End-plate potentialNeuromuscular JunctionElectromyographyBiologyNeuromuscular junctionCellular and Molecular NeuroscienceMicePostsynaptic potentialmedicineAnimalsReceptors CholinergicNerve Growth FactorsMuscle SkeletalMolecular BiologyAcetylcholine receptorMice KnockoutMotor Neuronsmedicine.diagnostic_testMuscle fatigueElectromyographyAge FactorsLong-term potentiationneuromuscular junction; neurotrophin-4; synaptic transmissionCell Biologymedicine.anatomical_structureMuscle Fibers Slow-TwitchMuscle FatigueAcetylcholinesteraseTetanic stimulationNeuroscienceMuscle Contraction
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