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PSD-95 is required for activity-driven synapse stabilization.

Ingrid Ehrlich1, Matthew Klein, Simon Rumpel

  • 1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA. ingrid.ehrlich@fmi.ch

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2007
PubMed
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Postsynaptic density protein 95 (PSD-95) is crucial for synapse stabilization after initial potentiation. Knockdown of PSD-95 impairs synaptic development and function, affecting spine size and turnover during long-term potentiation.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Activity-dependent regulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors is vital for synaptic development and plasticity.
  • Postsynaptic density protein 95 (PSD-95) is a key molecule involved in synaptic maturation, strengthening, and plasticity.

Purpose of the Study:

  • To investigate the role of PSD-95 in activity-dependent synapse stabilization.
  • To determine if PSD-95 is essential for the induction and expression of long-term potentiation (LTP).

Main Methods:

  • Utilized RNA interference (RNAi) to acutely knockdown PSD-95 in brain slice cultures.
  • Assessed synaptic structure and function development under spontaneous activity.
  • Examined the effects of PSD-95 knockdown on chemically induced LTP, spine size, and spine turnover.

Related Experiment Videos

Main Results:

  • Acute PSD-95 knockdown arrested normal synaptic structure and function development driven by spontaneous activity.
  • PSD-95 was not required for the induction and early expression of LTP.
  • PSD-95 knockdown resulted in smaller spine size increases post-LTP and elevated spine turnover that persisted after LTP.

Conclusions:

  • Appropriate levels of PSD-95 are necessary for activity-dependent synapse stabilization following initial potentiation phases.
  • PSD-95 plays a critical role in regulating spine morphology and stability during synaptic plasticity.