Related Experiment Video

Updated: Oct 19, 2026

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
09:39

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation

Published on: June 26, 2013

Translational suppression of calpain blocks long-term potentiation

P Vanderklish1, E Bednarski, G Lynch

  • 1Center for the Neurobiology of Learning and Memory, University of California at Irvine 92717, USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|September 1, 1996
PubMed

Insights

Reducing calpain 1 activity in brain slices did not affect baseline responses but significantly impaired long-term potentiation. This suggests calpain activation is essential for strengthening synaptic connections.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Calpains are calcium-dependent proteases implicated in various cellular processes.
  • Synaptic plasticity, the ability of synapses to strengthen or weaken over time, is crucial for learning and memory.
  • Repetitive neuronal activity can activate calpains in the hippocampus.

Purpose of the Study:

  • To investigate the role of calpain 1 in synaptic plasticity, specifically long-term potentiation (LTP).
  • To determine if inhibiting calpain 1 affects baseline synaptic transmission or the induction of LTP.

Main Methods:

  • Cultured hippocampal slices were used as the experimental model.
  • Antisense oligonucleotides were employed to specifically reduce calpain 1 activity by approximately 50%.
  • Synaptic responses were measured, and LTP was induced using a theta-burst stimulation paradigm.

Main Results:

  • Reduced calpain 1 activity had no discernible impact on baseline synaptic responses.
  • The incidence and magnitude of theta-burst stimulation-induced LTP were significantly diminished in slices with reduced calpain 1 activity.
  • These findings indicate a critical role for calpain 1 in the stabilization of synaptic strength.

Conclusions:

  • Calpain 1 activation, triggered by repetitive afferent activity, is a necessary step for establishing stable increases in synaptic strength.
  • Calpain 1 is essential for the molecular mechanisms underlying long-term potentiation in the hippocampus.
  • Targeting calpain activity may offer insights into modulating synaptic plasticity and related cognitive functions.

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