Correlating Fluorescence and High-Resolution Scanning Electron Microscopy (HRSEM) for the study of GABA receptor clustering induced by inhibitory synaptic plasticity.

Citation data:

Scientific reports, ISSN: 2045-2322, Vol: 7, Issue: 1, Page: 13768

Publication Year:
2017
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Repository URL:
http://hdl.handle.net/10754/625933
PMID:
29061992
DOI:
10.1038/s41598-017-14210-5
Author(s):
Orlando, Marta; Ravasenga, Tiziana; Petrini, Enrica Maria; Falqui, Andrea; Marotta, Roberto; Barberis, Andrea
Publisher(s):
Springer Nature
Tags:
Multidisciplinary
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article description
Both excitatory and inhibitory synaptic contacts display activity dependent dynamic changes in their efficacy that are globally termed synaptic plasticity. Although the molecular mechanisms underlying glutamatergic synaptic plasticity have been extensively investigated and described, those responsible for inhibitory synaptic plasticity are only beginning to be unveiled. In this framework, the ultrastructural changes of the inhibitory synapses during plasticity have been poorly investigated. Here we combined confocal fluorescence microscopy (CFM) with high resolution scanning electron microscopy (HRSEM) to characterize the fine structural rearrangements of post-synaptic GABA Receptors (GABARs) at the nanometric scale during the induction of inhibitory long-term potentiation (iLTP). Additional electron tomography (ET) experiments on immunolabelled hippocampal neurons allowed the visualization of synaptic contacts and confirmed the reorganization of post-synaptic GABAR clusters in response to chemical iLTP inducing protocol. Altogether, these approaches revealed that, following the induction of inhibitory synaptic potentiation, GABAR clusters increase in size and number at the post-synaptic membrane with no other major structural changes of the pre- and post-synaptic elements.