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Presynaptic active zone density during development and synaptic plasticity

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Clarke, Gwenaëlle L.·2012·Frontiers in Molecular Neuroscience

Abstract

Neural circuits transmit information through synapses, and the efficiency of synaptic transmission is closely related to the density of presynaptic active zones, where synaptic vesicles are released. The goal of this review is to highlight recent insights into the molecular mechanisms that control the number of active zones per presynaptic terminal (active zone density) during developmental and stimulus-dependent changes in synaptic efficacy. At the neuromuscular junctions (NMJs), the active zone density is preserved across species, remains constant during development, and is the same between synapses with different activities. However, the NMJ active zones are not always stable, as exemplified by the change in active zone density during acute experimental manipulation or as a result of aging. Therefore, a mechanism must exist to maintain its density. In the central nervous system (CNS), active zones have restricted maximal size, exist in multiple numbers in larger presynaptic terminals, and maintain a constant density during development. These findings suggest that active zone density in the CNS is also controlled. However, in contrast to the NMJ, active zone density in the CNS can also be increased, as observed in hippocampal synapses in response to synaptic plasticity. Although the numbers of known active zone proteins and protein interactions have increased, less is known about the mechanism that controls the number or spacing of active zones. The following molecules are known to control active zone density and will be discussed herein: extracellular matrix laminins and voltage-dependent calcium channels, amyloid precursor proteins, the small GTPase Rab3, an endocytosis mechanism including synaptojanin, cytoskeleton protein spectrins and β-adducin, and a presynaptic web including spectrins. The molecular mechanisms that organize the active zone density are just beginning to be elucidated.

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Crossref · 10.3389/fnmol.2012.00012

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  • Key molecular players that regulate active zone density include extracellular matrix laminins, voltage-dependent calcium channels, amyloid precursor proteins, the small GTPase Rab3, endocytosis mechanisms involving synaptojanin, and cytoskeletal proteins such as spectrins and β-adducin.

    “Key molecular players that regulate active zone density include extracellular matrix laminins, voltage-dependent calcium channels, amyloid precursor proteins, the small GTPase Rab3, endocytosis mechanisms involving synaptojanin, and cytoskeletal proteins such as spectrins and β-adducin [14].”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [14]

  • The number, size, and distribution of active zones profoundly influence how information is processed within a neuronal circuit and how the circuit adapts to internal or external cues.

    “The number, size, and distribution of active zones profoundly influence how information is processed within a neuronal circuit and how the circuit adapts to internal or external cues [14].”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [14]

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  1. Jin Y. (2005). Synaptogenesis. WormBook 1– 11 Available at: http://www.wormbook.org 18050400 PMC4781325

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Authors
Clarke, G. L.
Affiliations
University of Kansas (US)
Corresponding author
Clarke, Gwenaëlle L.
Venue
Frontiers in Molecular Neuroscience
Published
2012
Volume
5
Pages
12-12
ISSN
1662-5099 (ISSN-L)
OpenAlex
W2070515178
Cited by
33
References
154
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 2 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 5 · 2013: 4
FWCI
1.58
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Frontiers in Molecular Neuroscience (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
synaptic plasticity, neuromuscular junction, synaptic development, synaptic vesicle release, synaptic efficacy, laminin, voltage-gated calcium channels, amyloid precursor protein, Rab3, synaptojanin, endocytosis, spectrin, beta-adducin, hippocampus, aging

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