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Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
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Forebrain-specific calcineurin knockout selectively impairs bidirectional synaptic plasticity and

H Zeng1, S Chattarji, M Barbarosie

  • 1Howard Hughes Medical Institute, RIKEN-MIT Neuroscience Research Center, Center for Learning & Memory, Departments of Biology and Brain & Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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Disrupting calcineurin in adult forebrain mice impaired synaptic plasticity and working/episodic-like memory, but not reference memory. This highlights calcineurin's role in specific memory types.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cognitive Science

Background:

  • Calcineurin, a calcium-dependent protein phosphatase, is crucial for synaptic plasticity.
  • Understanding calcineurin's role in adult brain function is essential for cognitive research.

Purpose of the Study:

  • To investigate the specific role of calcineurin in adult forebrain synaptic plasticity and memory functions.
  • To determine if calcineurin disruption affects different types of memory differently.

Main Methods:

  • Conditional gene-targeting to create mice with disrupted calcineurin activity in the adult forebrain.
  • Electrophysiological recordings at hippocampal Schaffer collateral-CA1 synapses to assess long-term depression (LTD) and long-term potentiation (LTP).
  • Behavioral testing using hippocampus-dependent tasks like contextual fear conditioning, Morris water maze, delayed matching-to-place, and radial arm maze.

Main Results:

  • Calcineurin disruption significantly diminished LTD and shifted the LTD/LTP modification threshold at hippocampal synapses.
  • Mutant mice showed normal performance in reference memory tasks (contextual fear, Morris water maze).
  • Mutant mice exhibited impairments in working and episodic-like memory tasks (delayed matching-to-place, radial maze).

Conclusions:

  • Calcineurin plays a critical role in regulating bidirectional synaptic plasticity in the adult forebrain.
  • Calcineurin is essential for hippocampus-dependent working and episodic-like memory, but not reference memory.
  • These findings suggest a novel mechanistic distinction between different memory systems based on calcineurin function.