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Updated: Nov 9, 2025

High Resolution Quantitative Synaptic Proteome Profiling of Mouse Brain Regions After Auditory Discrimination Learning
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Sex differences in synaptic plasticity underlying learning.

Christine M Gall1,2, Aliza A Le1, Gary Lynch1,3

  • 1Department of Anatomy and Neurobiology, University of California, Irvine, CA, USA.

Journal of Neuroscience Research
|April 13, 2021
PubMed
Summary
This summary is machine-generated.

Female rodents exhibit distinct synaptic plasticity and learning mechanisms compared to males. Neuron-derived estrogen and estrogen receptor alpha are crucial for hippocampal long-term potentiation (LTP) and memory in females, influencing their learning thresholds.

Keywords:
actin cytoskeletonestrogenhippocampuslong-term potentiationspaced trainingspatial memory

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Sex differences in learning are known, but synaptic encoding mechanisms remain understudied.
  • Long-term potentiation (LTP) in male rodents is linked to actin cytoskeleton remodeling and memory.
  • Established models of LTP and memory encoding are primarily based on male rodent studies.

Purpose of the Study:

  • To investigate sex differences in the molecular mechanisms underlying hippocampal long-term potentiation (LTP) and memory.
  • To identify the role of estrogen signaling in synaptic plasticity and learning in female rodents.
  • To explore how distinct synaptic mechanisms in females may contribute to sex-specific learning and memory.

Main Methods:

  • Summarized existing findings on LTP and memory encoding in male rodents.
  • Investigated the requirement of actin regulatory mechanisms for hippocampal LTP and memory in female rodents.
  • Examined the role of neuron-derived estrogen and membrane-associated estrogen receptor alpha (ERα) in female synaptic plasticity.

Main Results:

  • The same actin regulatory mechanisms are essential for hippocampal LTP and memory in females as in males.
  • In females, modulatory receptors (e.g., TrkB) and signaling intermediaries (e.g., Src, ERK1/2) require estrogen and ERα signaling.
  • Females display a higher threshold for hippocampal LTP and spatial learning, associated with ERα involvement.

Conclusions:

  • Estrogen signaling through ERα is critical for hippocampal LTP and memory in female rodents.
  • Distinct synaptic plasticity thresholds in females, influenced by estrogen, contribute to sex differences in information processing.
  • This research highlights previously unappreciated sex-specific mechanisms in learning and memory.