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Related Experiment Videos

Stimulus frequency, calcium levels and striatal synaptic plasticity.

Paola Bonsi1, Antonio Pisani, Giorgio Bernardi

  • 1Fondazione Santa Lucia, IRCCS Rome.

Neuroreport
|March 14, 2003
PubMed
Summary

High-frequency stimulation of brain cells caused large calcium increases, leading to long-term depression in synaptic plasticity. This suggests significant calcium elevation is crucial for inducing synaptic depression.

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Striatal medium spiny projection neurons are critical for motor control and reward processing.
  • Synaptic plasticity, the ability of synapses to strengthen or weaken over time, is fundamental to learning and memory.
  • Intracellular calcium concentration ([Ca2+]i) is a key second messenger regulating numerous cellular processes, including synaptic plasticity.

Purpose of the Study:

  • To investigate the relationship between intracellular calcium dynamics and synaptic plasticity in striatal medium spiny projection neurons.
  • To determine the specific patterns of synaptic stimulation that induce changes in [Ca2+]i and synaptic strength.
  • To elucidate the role of calcium transients in the induction of long-term depression (LTD) at these synapses.

Main Methods:

Related Experiment Videos

  • Combined electrophysiological recordings of excitatory postsynaptic potentials (EPSPs) with microfluorimetric measurements of intracellular calcium.
  • Applied three distinct synaptic stimulation protocols: 1 Hz, 10 Hz, and 100 Hz.
  • Analyzed changes in EPSP amplitude and [Ca2+]i in response to each stimulation protocol.

Main Results:

  • Low-frequency stimulation (1 Hz) did not significantly alter EPSP amplitude or [Ca2+]i.
  • Moderate-frequency stimulation (10 Hz) increased [Ca2+]i moderately without affecting EPSP amplitude.
  • High-frequency stimulation (100 Hz) induced large, transient elevations in [Ca2+]i and resulted in a significant long-term depression of EPSP amplitude.

Conclusions:

  • The induction of long-term depression in striatal medium spiny projection neurons is dependent on large, transient increases in intracellular calcium.
  • Specific patterns of neuronal activity differentially regulate calcium signaling and synaptic plasticity.
  • These findings provide critical insights into the mechanisms underlying synaptic plasticity in the basal ganglia.