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Measuring CaMKII concentration in dendritic spines.

Nikolai Otmakhov¹, John Lisman

¹Biology Department, Brandeis University, 415 South St., Waltham, MA 02454, United States. otmakhov@brandeis.edu

Journal of Neuroscience Methods

|October 12, 2011

Summary

We developed a novel method to measure endogenous protein concentrations in tiny cellular compartments like dendritic spines. This technique quantifies Ca/calmodulin kinase II (CaMKII) in neurons, revealing significant concentration differences across cellular locations.

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Area of Science:

Neuroscience
Cell Biology
Biochemistry

Background:

Accurate measurement of endogenous protein concentrations in subcellular compartments is crucial for understanding cellular function.
Existing methods face limitations, especially for small compartments like dendritic spines, which are near the optical microscopy resolution limit.

Purpose of the Study:

To present a novel, high-resolution method for quantifying endogenous protein concentrations within specific cellular compartments.
To apply this method to determine the concentration of Ca/calmodulin kinase II (CaMKII) in various compartments of hippocampal neurons.

Main Methods:

The method involves fluorescent protein tagging and overexpression of the protein of interest.
Immunostaining of both overexpressed and endogenous proteins, alongside expression of a volume marker, is employed.

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Application to measure Ca/calmodulin kinase II (CaMKII) concentrations in hippocampal pyramidal neuron cell bodies, dendrites, and spines.

Main Results:

CaMKIIα subunit concentrations were measured at 71 microM in cell bodies, 46 microM in proximal dendrites, and 103 microM in dendritic spines.
Total CaMKII (α+β) concentrations were calculated to be 94 microM, 61 microM, and 138 microM in cell bodies, proximal dendrites, and spines, respectively.
The study highlights significant variations in CaMKII concentration across different neuronal compartments.

Conclusions:

The developed method enables precise measurement of endogenous protein concentrations in subcellular compartments, including challenging nanoscale structures.
Quantification of CaMKII in hippocampal neurons reveals compartment-specific concentrations, providing insights into its role in neuronal function.
This technique offers a valuable tool for future research in cell biology and neuroscience, particularly for studying protein dynamics in confined cellular spaces.