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Stores not just for storage. intracellular calcium release and synaptic plasticity
1Institute of Physiology, Ludwig-Maximilians University of Munich, 80336 Munich, Germany.
Neuron
|September 8, 2001
Summary
Central neurons release calcium from intracellular stores upon excitatory synapse activation. This store signaling, involving IP(3) and ryanodine receptors, is crucial for activity-dependent synaptic plasticity.
Area of Science:
- Neuroscience
- Cellular Biology
- Biochemistry
Background:
- Excitatory synapses in central neurons commonly trigger calcium release from intracellular stores.
- Glutamate binding to metabotropic receptors and subsequent IP(3) receptor activation are key mechanisms for synaptically evoked calcium release.
- Local calcium signals mediated by calcium-induced calcium release (CICR) via ryanodine or IP(3) receptors are increasingly recognized.
Purpose of the Study:
- To investigate the role of intracellular calcium release in synaptic function.
- To explore the mechanisms of synaptically evoked calcium signaling.
- To determine the impact of store signaling on activity-dependent synaptic plasticity.
Main Methods:
- Utilized mutant mice to study synaptic plasticity.
- Investigated calcium release from intracellular stores in central neurons.
- Examined the roles of IP(3) and ryanodine receptors in synaptic calcium signaling.
Main Results:
- Synaptic activation leads to calcium release from intracellular stores in most excitatory synapses.
- Glutamate-mediated activation of IP(3) receptors is a primary pathway for evoked calcium release.
- Evidence supports local calcium signaling through CICR involving ryanodine and IP(3) receptors.
- Mutant mouse studies indicate store signaling is a determinant of activity-dependent synaptic plasticity.
Conclusions:
- Intracellular calcium stores play a significant role in neuronal signaling.
- Store-operated calcium release mechanisms are critical for synaptic function and plasticity.
- Understanding these calcium dynamics is essential for comprehending neuronal activity regulation.
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