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Related Concept Videos

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Jun 23, 2026

Aversive Associative Learning and Memory Formation by Pairing Two Chemicals in Caenorhabditis elegans
07:17

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Published on: June 23, 2022

HDAC2 negatively regulates memory formation and synaptic plasticity.

Ji-Song Guan1, Stephen J Haggarty, Emanuela Giacometti

  • 1Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences.

Nature
|May 9, 2009
PubMed
Summary
This summary is machine-generated.

Histone deacetylase 2 (HDAC2) negatively regulates learning and memory by reducing synaptic density. Inhibiting HDAC2 enhances memory, suggesting HDAC2-selective drugs for memory impairment.

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09:43

Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue

Published on: November 30, 2018

Area of Science:

  • Neuroscience
  • Epigenetics
  • Molecular Biology

Background:

  • Chromatin modifications, particularly histone acetylation, are crucial for memory formation.
  • Histone deacetylase inhibitors (HDACis) enhance learning and memory in various models.

Purpose of the Study:

  • To identify specific histone deacetylase (HDAC) family members involved in cognitive enhancement.
  • To investigate the role of HDAC2 in synaptic plasticity, learning, and memory.

Main Methods:

  • Generated mice with neuron-specific overexpression or deficiency of HDAC2.
  • Administered chronic treatment with HDAC inhibitors (HDACis).
  • Assessed dendritic spine density, synapse number, synaptic plasticity, and memory formation.

Main Results:

  • Neuron-specific overexpression of HDAC2 decreased dendritic spine density, synapse number, and memory.
  • Hdac2 deficiency increased synapse number and facilitated memory, mimicking HDACi effects.
  • HDACi treatment ameliorated memory deficits in HDAC2-overexpressing mice but did not further enhance memory in Hdac2-deficient mice.
  • HDAC2 was found to associate with promoters of genes involved in synaptic plasticity.

Conclusions:

  • HDAC2 negatively regulates learning and memory by modulating synaptic plasticity and neural circuits.
  • Targeting HDAC2 with selective inhibitors may offer a therapeutic strategy for memory impairment disorders.