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Updated: Oct 5, 2025
Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
Published on: October 6, 2017
CaMKIIβ knockdown decreases store-operated calcium entry in hippocampal dendritic spines
Nikita Zernov1, Ilya Bezprozvanny1,2, Elena Popugaeva1
1Peter the Great St.Petersburg Polytechnic University, Laboratory of Molecular Neurodegeneration, St.Petersburg, Russia.
Abstract:
Calcium/calmodulin-dependent protein kinase II (CaMKII) and neuronal store-operated calcium entry (nSOCE) have been implicated in the development of Alzheimer's disease (AD). nSOCE is involved in regulation of dendritic spine shape, particularly in stability of mushroom spines that play role in formation of strong synapses. CaMKII is involved in regulation of induction of long-term potentiation, that is needed for shaping of memory. In the present study, we demonstrated that inhibition of kinase activity of CaMKII by KN-62 decreases nSOCE amplitude in soma of primary hippocampal neurons. We have shown that knockdown of CaMKIIβ leads to the downregulation of nSOCE in dendritic spines. In agreement with previously published data, we have also observed that CaMKIIβ knockdown causes mushroom spine loss in primary hippocampal culture. The effect of CaMKIIβ knockdown on the nSOCE may be associated with a decrease of dendritic spine head size.
Insights
Calcium/calmodulin-dependent protein kinase II (CaMKII) inhibition reduces neuronal store-operated calcium entry (nSOCE). CaMKIIβ knockdown also decreases nSOCE and leads to mushroom spine loss, suggesting a role in Alzheimer's disease pathogenesis.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Alzheimer's disease (AD) pathogenesis involves Calcium/calmodulin-dependent protein kinase II (CaMKII) and neuronal store-operated calcium entry (nSOCE).
- nSOCE regulates dendritic spine morphology, crucial for synaptic plasticity and memory formation.
- CaMKII is essential for long-term potentiation, a cellular mechanism underlying memory.
Purpose of the Study:
- To investigate the relationship between CaMKII activity and nSOCE in primary hippocampal neurons.
- To determine the role of CaMKIIβ in regulating nSOCE and dendritic spine morphology.
Main Methods:
- Inhibition of CaMKII kinase activity using KN-62.
- Knockdown of CaMKIIβ expression.
- Measurement of nSOCE amplitude in neuronal soma and dendritic spines.
- Assessment of dendritic spine morphology in primary hippocampal cultures.
Main Results:
- Inhibition of CaMKII by KN-62 decreased nSOCE amplitude in the soma of primary hippocampal neurons.
- CaMKIIβ knockdown resulted in the downregulation of nSOCE in dendritic spines.
- CaMKIIβ knockdown led to mushroom spine loss, potentially due to reduced dendritic spine head size.
Conclusions:
- CaMKII activity is critical for regulating nSOCE in neurons.
- CaMKIIβ plays a significant role in maintaining nSOCE and dendritic spine stability.
- These findings suggest a potential therapeutic target for Alzheimer's disease by modulating CaMKII and nSOCE pathways.
