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The calcium sensor Copine-6 regulates spine structural plasticity and learning and memory
Judith R Reinhard1, Alexander Kriz1, Milos Galic1
1Biozentrum, University of Basel, Klingelbergstrasse 70, 4056 Basel, Switzerland.
Nature Communications
|May 20, 2016
Summary
Copine-6 protein is crucial for learning and memory by linking calcium signals to structural changes in neurons. This protein
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Hippocampal long-term potentiation (LTP) is vital for learning and memory.
- LTP involves changes in excitatory synapse structure.
- The molecular mechanisms linking calcium signals to structural plasticity are not fully understood.
Purpose of the Study:
- To identify the molecular mechanism linking calcium signals to spine structural plasticity during LTP.
- To investigate the role of the calcium-binding protein Copine-6 in synaptic plasticity and memory.
Main Methods:
- Utilized Copine-6 knockout mice and mutant expression in wild-type neurons.
- Observed calcium transients and spine structural changes in hippocampal neurons.
- Assessed LTP, learning, and memory performance.
- Investigated the interaction of Copine-6 with Rho GTPase Rac1.
- Used jasplakinolide to assess the role of actin stabilization.
Main Results:
- Copine-6 is recruited to postsynaptic membranes by calcium transients preceding LTP.
- Copine-6 knockout mice exhibit deficits in hippocampal LTP, learning, and memory.
- Neurons lacking Copine-6 or expressing a calcium-mutant form show impaired spine structural plasticity.
- Copine-6 binds, activates, and recruits Rac1 to cell membranes.
- Jasplakinolide rescues the LTP deficit in Copine-6 knockout mice.
Conclusions:
- Copine-6 acts as a critical link between activity-triggered calcium signals and spine structural plasticity.
- This mechanism is essential for hippocampal LTP, learning, and memory.
- Copine-6's function involves the regulation of Rac1 and actin dynamics.
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