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RESEARCH PRODUCT
The dendritic spines of interneurons are dynamic structures influenced by PSA-NCAM expression.
David Sanchez-matarredonaEsther Castillo-gómezTeresa LiberiaMarta Perez-randoCarlos CrespoEmilo VareaJuan NacherLaura Rovira-estebanRamon GuiradoRamon GuiradoJosé Miguel Blasco-ibáñezsubject
MaleDendritic spineTime FactorsInterneuronCognitive NeuroscienceDendritic SpinesGreen Fluorescent ProteinsHippocampusNeuraminidaseMice TransgenicNerve Tissue ProteinsNeural Cell Adhesion Molecule L1BiologyHippocampal formationIn Vitro TechniquesHippocampus03 medical and health sciencesCellular and Molecular NeuroscienceMice0302 clinical medicineOrgan Culture TechniquesInterneuronsmedicineAnimals030304 developmental biology0303 health sciencesPolysialic acidGlutamate DecarboxylaseDendritic filopodiamedicine.anatomical_structurenervous systemAnimals NewbornGene Expression RegulationCalbindin 2Excitatory postsynaptic potentialSialic AcidsNeural cell adhesion moleculeCholecystokininSomatostatinNeuroscience030217 neurology & neurosurgeryVasoactive Intestinal Peptidedescription
Excitatory neurons undergo dendritic spine remodeling in response to different stimuli. However, there is scarce information about this type of plasticity in interneurons. The polysialylated form of the neural cell adhesion molecule (PSA-NCAM) is a good candidate to mediate this plasticity as it participates in neuronal remodeling and is expressed by some mature cortical interneurons, which have reduced dendritic arborization, spine density, and synaptic input. To study the connectivity of the dendritic spines of interneurons and the influence of PSA-NCAM on their dynamics, we have analyzed these structures in a subpopulation of fluorescent spiny interneurons in the hippocampus of glutamic acid decarboxylase-enhanced green fluorescent protein transgenic mice. Our results show that these spines receive excitatory synapses. The depletion of PSA in vivo using the enzyme Endo-Neuraminidase-N (Endo-N) increases spine density when analyzed 2 days after, but decreases it 7 days after. The dendritic spine turnover was also analyzed in real time using organotypic hippocampal cultures: 24 h after the addition of EndoN, we observed an increase in the apparition rate of spines. These results indicate that dendritic spines are important structures in the control of the synaptic input of hippocampal interneurons and suggest that PSA-NCAM is relevant in the regulation of their morphology and connectivity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-06-20 | Cerebral cortex (New York, N.Y. : 1991) |