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Memory maintenance by PKMζ--an evolutionary perspective.

Todd Charlton Sacktor1

  • 1The Robert F. Furchgott Center for Neural and Behavioral Science, Department of Physiology, State University of New York Downstate Medical Center, 450 Clarkson Ave, Brooklyn, NY 10705, USA. tsacktor@downstate.edu

Molecular Brain
|September 19, 2012
PubMed
Summary
This summary is machine-generated.

Persistent activity of protein kinase M zeta (PKMζ) is essential for maintaining long-term memory and synaptic potentiation. This molecular mechanism is conserved across species and crucial for stable, yet flexible, memory storage.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cognitive Science

Background:

  • Long-term memory relies on persistent synaptic modifications within neural circuits.
  • Long-term potentiation (LTP) is a key model for studying memory-related synaptic enhancement.
  • Mechanisms maintaining LTP and long-term memory storage remain incompletely understood.

Purpose of the Study:

  • To identify the molecular mechanisms responsible for the persistent maintenance of LTP.
  • To investigate the role of protein kinase M zeta (PKMζ) in long-term memory storage.
  • To explore the evolutionary conservation and functional significance of PKMζ in memory.

Main Methods:

  • Investigated the role of constitutively active atypical protein kinase C (aPKC) isoform, PKMζ.
  • Utilized pharmacological and dominant-negative inhibitors to block PKMζ activity.
  • Examined PKMζ expression and function in various brain regions and model organisms (invertebrates and rodents).

Main Results:

  • Persistent PKMζ activity was found to be necessary and sufficient for maintaining LTP.
  • Inhibition of PKMζ disrupted established long-term memories across diverse neural circuits.
  • PKMζ is synthesized de novo during LTP and memory formation, enhancing synaptic strength by increasing AMPA receptors.

Conclusions:

  • PKMζ represents a conserved molecular mechanism for the persistent storage of long-term memory.
  • This mechanism is evolutionarily ancient, originating in early vertebrates, and conserved in invertebrates.
  • The PKMζ pathway offers a stable yet flexible system for memory, adaptable through processes like extinction.