Inhibitory Synapses Are Repeatedly Assembled and Removed at Persistent Sites In Vivo
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Inhibitory synapses.pdf
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Author(s)
Oh, Won Chan
Kwon, Hyung-Bae
Kubota, Yoshiyuki
Villa, Katherine Leigh
Berry, Kalen Paul
Subramanian, Jaichandar
Cha, Jae Won
So, Peter T. C.
Nedivi, Elly
Date Issued
February 2016
Journal
Neuron
Publisher
Elsevier/Cell Press
Citation
Villa, Katherine L. et al. “Inhibitory Synapses Are Repeatedly Assembled and Removed at Persistent Sites In Vivo.” Neuron 89.4 (2016): 756–769.
Version
Author's final manuscript
Abstract
Older concepts of a hard-wired adult brain have been overturned in recent years by in vivo imaging studies revealing synaptic remodeling, now thought to mediate rearrangements in microcircuit connectivity. Using three-color labeling and spectrally resolved two-photon microscopy, we monitor in parallel the daily structural dynamics (assembly or removal) of excitatory and inhibitory postsynaptic sites on the same neurons in mouse visual cortex in vivo. We find that dynamic inhibitory synapses often disappear and reappear again in the same location. The starkest contrast between excitatory and inhibitory synapse dynamics is on dually innervated spines, where inhibitory synapses frequently recur while excitatory synapses are stable. Monocular deprivation, a model of sensory input-dependent plasticity, shortens inhibitory synapse lifetimes and lengthens intervals to recurrence, resulting in a new dynamic state with reduced inhibitory synaptic presence. Reversible structural dynamics indicate a fundamentally new role for inhibitory synaptic remodeling—flexible, input-specific modulation of stable excitatory connections.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Massachusetts Institute of Technology. Department of Biology
Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology. Department of Mechanical Engineering
Picower Institute for Learning and Memory
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.neuron.2016.01.010
