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Updated: May 22, 2026
In Vivo Chronic Two-Photon Imaging of Microglia in the Mouse Hippocampus
Published on: July 6, 2022
Two-photon imaging of microglia in the mouse cortex in vivo
Abstract:
Microglia are the primary immune effector cells of the brain parenchyma. They are distributed throughout the brain at various densities. Two-photon fluorescence microscopy, together with expression of fluorescent proteins in microglia, has enabled study of these fascinating cells in vivo. Imaging studies have shown, for example, that microglia continually survey their cellular environment and immediately respond to injury. However, we still know very little about their roles in various parts of the developing and adult brain or their diverse effector functions in aging and different disease states. Experimental procedures have been developed for minimally invasive short- and long-term two-photon imaging of microglial cells in cortical regions of the intact mouse brain. This protocol describes two-photon imaging of microglia in the mouse cortex in vivo, using mice which have had a head plate implanted and have been prepared with either a thinned skull or optical window. Technical pitfalls, limitations, and alternative approaches are also discussed.
Insights
This study details a protocol for in vivo two-photon imaging of microglia in the mouse cortex. This technique allows researchers to observe microglia
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the brain's primary immune cells, surveying their environment and responding to injury.
- Their roles in brain development, aging, and disease remain incompletely understood.
- In vivo imaging techniques are crucial for studying microglia dynamics.
Purpose of the Study:
- To present a detailed protocol for minimally invasive two-photon imaging of microglia in the mouse cortex.
- To enable in vivo observation of microglial behavior and responses.
- To facilitate further research into microglial functions in various brain states.
Main Methods:
- Utilizing two-photon fluorescence microscopy in live mice.
- Employing genetically engineered mice expressing fluorescent proteins in microglia.
- Implementing surgical preparation with either a thinned skull or an optical window.
- Performing short- and long-term imaging in the cortical regions.
Main Results:
- Established a reliable protocol for high-resolution in vivo imaging of microglia.
- Demonstrated the ability to observe microglial surveillance and immediate responses to stimuli.
- Provided insights into technical considerations and potential challenges of the imaging technique.
Conclusions:
- Two-photon imaging offers a powerful tool for studying microglia in vivo.
- This protocol facilitates the investigation of microglial roles in health and disease.
- Further research can leverage this method to explore microglial functions across different brain conditions.
