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Updated: Apr 17, 2026
11:41
Visualizing Shifts on Neuron-Glia Circuit with the Calcium Imaging Technique
Published on: April 8, 2022
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Modulation of microglial process convergence toward neuronal dendrites by extracellular calcium
Ukpong B Eyo1, Nan Gu2, Srijisnu De1
1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854.
Summary
Reduced brain calcium triggers microglia to converge their processes onto neuronal dendrites, a novel interaction mediated by ATP and P2Y12 receptors, revealing microglia
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Extracellular calcium (Ca2+) levels in the brain fluctuate with neuronal activity.
- Microglia, the resident immune cells of the brain, are highly dynamic.
- The impact of extracellular calcium on microglial dynamics remains unexplored.
Purpose of the Study:
- To investigate the effects of extracellular calcium concentrations on microglial dynamics in the brain.
- To characterize the phenomenon of microglial process convergence (MPCs) induced by calcium reduction.
Main Methods:
- Utilized two-photon microscopy in mouse brain slices and in vivo.
- Manipulated extracellular calcium concentrations.
- Investigated the role of neuronal activity, ATP release, and P2Y12 receptors.
Main Results:
- Discovered that reduced extracellular calcium induces microglial processes to converge at specific sites (MPCs).
- MPCs were observed to target neuronal dendrites.
- MPCs occur independently of neuronal action potential firing.
- The process is mediated by extracellular ATP release and microglial P2Y12 receptors.
Conclusions:
- Microglia exhibit a novel dynamic response (MPCs) to reduced extracellular calcium.
- Microglia actively monitor and interact with neuronal dendrites under conditions of low cerebral calcium.
- This interaction is crucial in both normal and diseased brain states.
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