Proteasome inhibition enhances the induction and impairs the maintenance of late-phase long-term potentiation
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Protein degradation by the ubiquitin–proteasome pathway plays important roles in synaptic plasticity, but the molecular mechanisms by which proteolysis regulates synaptic strength are not well understood. We investigated the role of the proteasome in hippocampal late-phase long-term potentiation (L-LTP), a model for enduring synaptic plasticity. We show here that inhibition of the proteasome enhances the induction of L-LTP, but inhibits its maintenance. Proteasome inhibitor-mediated enhancement of the early part of L-LTP requires activation of NMDA receptors and the cAMP-dependent protein kinase. Augmentation of L-LTP induction by proteasome inhibition is blocked by a protein synthesis inhibitor anisomycin and is sensitive to the drug rapamycin. Our findings indicate that proteasome inhibition increases the induction of L-LTP by stabilizing locally translated proteins in dendrites. In addition, our data show that inhibition of the proteasome blocks transcription of brain-derived neurotrophic factor (BDNF), which is a cAMP-responsive element-binding protein (CREB)-inducible gene. Furthermore, our results demonstrate that the proteasome inhibitors block degradation of ATF4, a CREB repressor. Thus, proteasome inhibition appears to hinder CREB-mediated transcription. Our results indicate that blockade of proteasome activity obstructs the maintenance of L-LTP by interfering with transcription as well as translation required to sustain L-LTP. Thus, proteasome-mediated proteolysis has different roles during the induction and the maintenance of L-LTP.
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Proteasome activity can modulate LTP induction thresholds.
“Because of previous studies suggesting that proteasome activity can modulate LTP induction thresholds (Dong et al., 2008), we next used a weaker stimulation paradigm, instead stimulating with a single 1-s 100-Hz train.”
From Altered Phosphorylation of the Proteasome Subunit Rpt6 Has Minimal Impact on Synaptic Plasticity and Learning (2021) · cites this paper as Dong et al., 2008
Relief of transcriptional repression owing to ATF4, a mammalian analogue of CREB2, seems to be important for the maintenance of hippocampal LTP.
“Similarly, relief of transcriptional repression owing to ATF4, a mammalian analogue of CREB2, seems to be important for the maintenance of hippocampal LTP102,103.”
From The right time to learn: Mechanisms and optimization of spaced learning (2016) · cites this paper as [102]
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- Authors
- Dong, C., Upadhya, S. C., Ding, L., Smith, T. K., & Hegde, A. N.
- Affiliations
- Wake Forest University Health Sciences (US)
- ORCID
- Hegde, Ashok N.
- Venue
- Learning & Memory
- Publisher
- Cold Spring Harbor Laboratory
- Published
- 2008-04-25
- Volume
- 15
- Issue
- 5
- Pages
- 335-347
- ISSN
- 1072-0502 (ISSN-L)
- 1549-5485
- PMC
- PMC2364605
- OpenAlex
- W2050711545
- Cited by
- 158
- References
- 79
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 9 · 2023: 11 · 2022: 8 · 2021: 5 · 2020: 5 · 2019: 10 · 2018: 7 · 2017: 10 · 2016: 11 · 2015: 21 · 2014: 11 · 2013: 9 · 2012: 7
- Type
- posted content
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Learning & Memory (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Vanderbilt University
- Wake Forest University
- Brandeis University
- University of Alberta
- National Institute of Mental Health (MH060225, R01MH060225)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Keywords
- proteasome inhibition, synaptic plasticity, ubiquitin-proteasome system, protein degradation, NMDA receptor, protein kinase A, anisomycin, rapamycin, protein synthesis, CREB, ATF4, hippocampus
- MeSH terms
- Animals, Anisomycin, Dendrites, Hippocampus, Neuronal Plasticity, Peptide Hydrolases, Protein Synthesis Inhibitors, RNA, Messenger, Synapses, Protein Biosynthesis, Transcriptional Activation, Receptors, N-Methyl-D-Aspartate, Cyclic AMP Response Element-Binding Protein, Long-Term Potentiation, Cyclic AMP-Dependent Protein Kinases, Brain-Derived Neurotrophic Factor, Ubiquitin, Mice, Proteasome Inhibitors
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