Journal
CEREBRAL CORTEX
Volume 24, Issue 11, Pages 3014-3024Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bht156
Keywords
dendritic spine; hippocampus; polysialic acid; structural plasticity; interneuron
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Funding
- Spanish Ministry of Science and Innovation (MICINN-FEDER) [BFU2009-12284/BFI, MICINN-PIM2010ERN-00577/NEUCONNECT]
- Fundacion Alicia Koplowitz
- Generalitat Valenciana [ACOMP/2012/229]
- Spanish Ministry of Education and Science [BES 2007-15757]
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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.
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