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Updated: Jun 30, 2026
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Imaging Mitochondrial Ca2+ Uptake in Astrocytes and Neurons using Genetically Encoded Ca2+ Indicators (GECIs)
Published on: January 22, 2022
Mitochondria modulate Ca2+-dependent glutamate release from rat cortical astrocytes
Reno C Reyes1, Vladimir Parpura
1Department of Neurobiology, Center for Glial Biology in Medicine, Atomic Force Microscopy and Nanotechnology Laboratories, Civitan International Research Center, Evelyn F. McKnight Brain Institute, University of Alabama, Birmingham, Alabama 35294, USA.
Summary
Mitochondria regulate calcium levels in astrocytes, influencing glutamate release. Inhibiting mitochondrial calcium uptake increases release, while enhancing it decreases release, revealing mitochondria
Area of Science:
- Neuroscience
- Cell Biology
- Astrocyte Biology
Background:
- Vesicular glutamate release from astrocytes is calcium-dependent.
- Mitochondria are known to modulate calcium in neurons but their role in astrocytes is unclear.
Purpose of the Study:
- To investigate the role of mitochondria in modulating astrocytic calcium dynamics and glutamate release.
- To determine if mitochondria influence calcium-dependent glutamate release from astrocytes.
Main Methods:
- Pharmacological manipulation of mitochondrial calcium accumulation in solitary astrocytes.
- Optical measurement of cytosolic calcium (Ca(2+)(cyt)) using fluorescent indicators.
- Enzyme-linked assays to quantify glutamate release.
Main Results:
- Inhibiting mitochondrial calcium uptake correlated with increased Ca(2+)(cyt) and glutamate release.
- Enhancing mitochondrial calcium uptake correlated with decreased Ca(2+)(cyt) and glutamate release.
- Mitochondrial activity significantly impacts astrocytic calcium signaling.
Conclusions:
- Mitochondria play a crucial role in modulating astrocytic calcium dynamics.
- Mitochondria are involved in regulating Ca(2+)-dependent glutamate release from astrocytes.
- Astrocytic glutamate release is influenced by ER, plasma membrane channels, and mitochondria.
