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Metabotropic NMDAR Signaling Contributes to Sex Differences in Synaptic Plasticity and Episodic Memory.

Aliza A Le1, Julie C Lauterborn1, Yousheng Jia1

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Sex differences emerge in how the brain stabilizes memory. In males, metabotropic N-methyl-D-aspartate receptor (NMDAR) signaling is key for enduring long-term potentiation (LTP). Females, however, utilize estrogen receptor alpha (ERα) for this process, impacting episodic memory encoding.

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NMDARactinestrogen receptorhippocampusmemorymetabotropic

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Long-term potentiation (LTP) is crucial for memory formation.
  • N-methyl-D-aspartate receptors (NMDARs) mediate initial LTP induction.
  • Enduring LTP requires stabilization of synaptic modifications, involving cytoskeletal changes.

Purpose of the Study:

  • Investigate sex differences in the mechanisms stabilizing enduring LTP.
  • Determine the roles of ion flux-independent NMDAR signaling and estrogen receptor alpha (ERα) in LTP consolidation.
  • Examine the impact of these mechanisms on episodic memory encoding.

Main Methods:

  • Utilized NMDAR channel blockers (MK-801) and selective GluN2B subunit antagonists (Ro25-6981).
  • Administered ERα antagonists to assess their effects on LTP and actin polymerization.
  • Assessed performance in episodic memory paradigms (spatial, "what", and "when" tasks).

Main Results:

  • MK-801 blocked LTP expression in both sexes but not actin polymerization.
  • Ro25-6981 blocked LTP consolidation and actin polymerization in males only.
  • ERα antagonist disrupted LTP and actin polymerization in females but not males.
  • Sex-specific effects on LTP consolidation correlated with differential performance in episodic memory tasks.

Conclusions:

  • Ion flux-independent NMDAR signaling stabilizes LTP in males via cytoskeletal changes.
  • Females rely on ERα for metabotropic NMDAR functions in LTP stabilization.
  • Sex differences in LTP consolidation mechanisms contribute to distinct episodic memory encoding strategies.