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Cell-type specific calcium responses in acute rat hippocampal slices
Roger Dallwig1, Joachim W Deitmer
1Abteilung für Allgemeine Zoologie, FB Biologie, Universität Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern, Germany.
Journal of Neuroscience Methods
|May 15, 2002
Summary
Identifying astrocytes in brain slices is challenging. This study shows that astrocytes, unlike neurons, respond to low potassium levels with calcium transients, aiding their identification during calcium imaging.
Area of Science:
- Neuroscience
- Cell Biology
- Neurophysiology
Background:
- Distinguishing between glial cells (astrocytes) and neurons in brain slices is crucial for accurate research.
- Previous work indicated astrocytes, but not neurons, exhibit cytosolic calcium (Ca2+) transients in response to low external potassium (<1 mM).
Purpose of the Study:
- To determine if the calcium response to low external potassium can be utilized to identify astrocytes during calcium imaging experiments.
- To investigate the Ca2+ responses to both low ( <1 mM) and high (50 mM) K+ in cultured cells and hippocampal slices.
Main Methods:
- Calcium imaging in cultured cells and hippocampal slices.
- Utilizing Fluo-4 for calcium fluorescence detection.
- Identifying astrocytes via S-100B positivity and neurons via neuron-specific enolase.
- Assessing cellular responses to varying external potassium concentrations.
Main Results:
- In hippocampal slices, S-100B-positive cells (presumed astrocytes) showed higher Fluo-4 accumulation than pyramidal neurons.
- 81% of cells with strong Fluo-4 fluorescence responded to low K+.
- 86% of these low K+-responsive cells were S-100B-positive, confirming astrocyte identity.
Conclusions:
- Responsiveness to low external potassium concentrations serves as a reliable indicator for identifying astrocytes in acute brain slices.
- This finding offers a valuable tool for enhancing the accuracy of calcium imaging studies in neuroscience.