Cited by 207Neuroscience and Neuropharmacology ResearchAdvanced Electron Microscopy Techniques and ApplicationsCellular transport and secretion

Differentiation and Characterization of Excitatory and Inhibitory Synapses by Cryo-electron Tomography and Correlative Microscopy

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Tao, Chang-Lu, Liu, Yun-Tao, Sun, Rong, Zhang, Bin, Qi, Lei, Shivakoti, Sakar, Tian, Chong-Li, Zhang, Peijun +3 more·2018·The Journal of Neuroscience

Abstract

As key functional units in neural circuits, different types of neuronal synapses play distinct roles in brain information processing, learning, and memory. Synaptic abnormalities are believed to underlie various neurological and psychiatric disorders. Here, by combining cryo-electron tomography and cryo-correlative light and electron microscopy, we distinguished intact excitatory and inhibitory synapses of cultured hippocampal neurons, and visualized the in situ 3D organization of synaptic organelles and macromolecules in their native state. Quantitative analyses of >100 synaptic tomograms reveal that excitatory synapses contain a mesh-like postsynaptic density (PSD) with thickness ranging from 20 to 50 nm. In contrast, the PSD in inhibitory synapses assumes a thin sheet-like structure ∼12 nm from the postsynaptic membrane. On the presynaptic side, spherical synaptic vesicles (SVs) of 25–60 nm diameter and discus-shaped ellipsoidal SVs of various sizes coexist in both synaptic types, with more ellipsoidal ones in inhibitory synapses. High-resolution tomograms obtained using a Volta phase plate and electron filtering and counting reveal glutamate receptor-like and GABA A receptor-like structures that interact with putative scaffolding and adhesion molecules, reflecting details of receptor anchoring and PSD organization. These results provide an updated view of the ultrastructure of excitatory and inhibitory synapses, and demonstrate the potential of our approach to gain insight into the organizational principles of cellular architecture underlying distinct synaptic functions. SIGNIFICANCE STATEMENT To understand functional properties of neuronal synapses, it is desirable to analyze their structure at molecular resolution. We have developed an integrative approach combining cryo-electron tomography and correlative fluorescence microscopy to visualize 3D ultrastructural features of intact excitatory and inhibitory synapses in their native state. Our approach shows that inhibitory synapses contain uniform thin sheet-like postsynaptic densities (PSDs), while excitatory synapses contain previously known mesh-like PSDs. We discovered “discus-shaped” ellipsoidal synaptic vesicles, and their distributions along with regular spherical vesicles in synaptic types are characterized. High-resolution tomograms further allowed identification of putative neurotransmitter receptors and their heterogeneous interaction with synaptic scaffolding proteins. The specificity and resolution of our approach enables precise in situ analysis of ultrastructural organization underlying distinct synaptic functions.

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Authors
Tao, C.-L., Liu, Y.-T., Sun, R., Zhang, B., Qi, L., Shivakoti, S., Tian, C.-L., Zhang, P., Lau, P.-M., Zhou, Z. H., & Bi, G.-Q.
Affiliations
  • Chinese Academy of Sciences (CN)
  • Centre for Human Genetics (GB)
  • California NanoSystems Institute (US)
  • University of Science and Technology of China (CN)
Corresponding author
  • Zhou, Z. Hong
  • Bi, Guo-Qiang
Venue
The Journal of Neuroscience
Published
2018-01-08
Volume
38
Issue
6
Pages
1493-1510
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2783481291
Cited by
207
References
91
Citations by year
2026: 18 · 2025: 24 · 2024: 30 · 2023: 14 · 2022: 27 · 2021: 40 · 2020: 30 · 2019: 17 · 2018: 5 · 2016: 1 · 2012: 1
FWCI
10.48
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Science Foundation
  • Wellcome Trust (206422/Z/17/Z)
  • National Natural Science Foundation of China (2009CB941300, 31070935, PSD-95)
  • National Institutes of Health (1s10od018111-01)
  • Biotechnology and Biological Sciences Research Council (BB/S003339/1)
  • National Institute of General Medical Sciences (R01GM071940)
  • National Center for Research Resources (S10RR023057)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Structural Biology › Advanced Electron Microscopy Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
excitatory synapses, inhibitory synapses, synaptic ultrastructure, postsynaptic density, synaptic vesicles, glutamate receptors, GABAA receptor, synaptic scaffolding proteins, adhesion molecules, hippocampal neurons, cryo-electron tomography, correlative light and electron microscopy
MeSH terms
Animals, Female, Image Processing, Computer-Assisted, Inhibition, Psychological, Neurons, Pregnancy, Receptors, GABA-A, Synapses, Synaptic Vesicles, Tomography, Cell Adhesion Molecules, Receptors, Glutamate, Excitatory Postsynaptic Potentials, Cryoelectron Microscopy, Rats, Post-Synaptic Density

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