Related Experiment Videos
NMDA receptor antagonists sustain LTP and spatial memory: active processes mediate LTP decay
Desiree M Villarreal1, Viet Do, Evelyn Haddad
1The Department of Biology and The Cajal Neuroscience Research Center, Division of Life Sciences, The University of Texas at San Antonio, 6900 N. Loop 1604 W., San Antonio, Texas 78249-0662, USA.
Nature Neuroscience
|December 12, 2001
Summary
Long-term potentiation (LTP) decay is actively reversed by N-methyl-D-aspartate (NMDA) receptor activation. Blocking NMDA receptors preserves LTP and enhances spatial memory retention, revealing dynamic regulation of synaptic plasticity.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Memory Research
Background:
- Long-term potentiation (LTP) is a crucial mechanism for memory formation but is not permanent and decays over time.
- The precise mechanisms driving LTP decay remain largely unknown.
- Understanding LTP decay is vital for comprehending memory persistence and potential interventions.
Purpose of the Study:
- To investigate the role of synaptic activity in the decay of perforant path-dentate LTP.
- To determine if N-methyl-D-aspartate (NMDA) receptor activation contributes to LTP decay.
- To assess the impact of modulating NMDA receptor activity on spatial memory retention.
Main Methods:
- Administered the competitive NMDA receptor antagonist CPP daily after LTP induction to assess decay over one week.
- Administered CPP two days post-LTP induction to evaluate its effect on the late phase of LTP.
- Administered CPP for five days following spatial memory training to measure its effect on memory retention.
Main Results:
- Daily CPP administration blocked LTP decay over a one-week period.
- CPP administration two days after LTP induction prevented the decay of the late, protein-synthesis-dependent phase.
- Five days of CPP treatment post-spatial memory training improved subsequent memory retention.
Conclusions:
- LTP decay is an active process regulated by NMDA receptor activation.
- Both early and late phases of LTP are dynamically controlled by NMDA receptors.
- NMDA receptor activity influences the persistence of synaptic changes and spatial memory.