Mechanisms and Role of Dendritic Membrane Trafficking for Long-Term Potentiation
Open accessAbstract
Long-term potentiation (LTP) of excitatory synapses is a major form of plasticity for learning and memory in the central nervous system. While the molecular mechanisms of LTP have been debated for decades, there is consensus that LTP induction activates membrane trafficking pathways within dendrites that are essential for synapse growth and strengthening. Current models suggest that key molecules for synaptic potentiation are sequestered within intracellular organelles, which are mobilized by synaptic activity to fuse with the plasma membrane following LTP induction. While the identity of the factors mobilized to the plasma membrane during LTP remain obscure, the field has narrowly focused on AMPA-type glutamate receptors. Here, we review recent literature and present new experimental data from our lab investigating whether AMPA receptors trafficked from intracellular organelles directly contribute to synaptic strengthening during LTP. We propose a modified model where membrane trafficking delivers distinct factors that are required to maintain synapse growth and AMPA receptor incorporation following LTP. Finally, we pose several fundamental questions that may guide further inquiry into the role of membrane trafficking for synaptic plasticity.
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LTP expression is due to rapid postsynaptic accumulation of AMPARs.
“Thus, it is now generally accepted that LTP expression is due to the rapid postsynaptic accumulation of AMPARs.”
From Synaptic memory and CaMKII (2023) · cites this paper as [237]
Many synaptic proteins are remarkably dynamic, including AMPARs, NMDARs, CaMKII, and scaffolding proteins such as PSD-95.
“These studies show that many synaptic proteins are remarkably dynamic, including AMPARs (237, 249, 327, 328), NMDARs (329), CaMKII (330), and scaffolding proteins, such as PSD-95 (331).”
From Synaptic memory and CaMKII (2023) · cites this paper as [237]
Citation 331 is attached to PSD-95, so the question is whether this source describes that scaffolding protein as dynamic. The Introduction section on lateral diffusion identifies PSD-95 as an anchor for mobile AMPA receptors, but does not describe PSD-95 itself as mobile or dynamically exchanged. Searches for PSD-95 mobility, turnover, and trafficking found no passage establishing that point. (LLM, conf=0.72)
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Nicoll, R. A., & Schulman, H. (2023) · Physiological Reviews · doi:10.1152/physrev.00034.2022 · Cited by 126 · see citing works
“As discussed elsewhere (17 – 22, 237 ), revelations obtained from The second mechanism for the synaptic accumulation of AMPARs involves classical dendritic spines.”
Background
- Authors
- Hiester, B. G., Becker, M. I., Bowen, A. B., Schwartz, S. L., & Kennedy, M. J.
- Affiliations
- University of Colorado Anschutz (US)
- Corresponding author
- Kennedy, Matthew J.
- Venue
- Frontiers in Cellular Neuroscience
- Publisher
- Frontiers Media SA
- Published
- 2018-10-30
- Volume
- 12
- Pages
- 391-391
- ISSN
- 1662-5102 (ISSN-L)
- PMC
- PMC6218485
- OpenAlex
- W2899312143
- Cited by
- 37
- References
- 24
- Citations by year
- 2024: 4 · 2023: 11 · 2022: 5 · 2021: 7 · 2020: 7 · 2019: 2 · 2018: 1
- FWCI
- 1.94
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institute of Neurological Disorders and Stroke (NS082271, NS103328, NS092421)
- National Institute on Aging (AG058005)
- 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 › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Keywords
- long-term potentiation, synaptic plasticity, AMPA receptors, intracellular organelles, membrane fusion, excitatory synapses, learning and memory
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